Downhole drilling assembly.

SET OF PERFORATION OF THE WELL FUND FIELD OF THE INVENTION

The present invention is concerned with a bottomhole stabilizer, such as a drilling motor stabilizer and with a bottomhole assembly comprising such a stabilizer.

The present invention is also concerned with improved stabilization devices for drilling engines and in particular but not exclusively, with stabilization devices for use with addressable high-speed motors for operation in a borehole.

The present invention is also related to a new fixing mechanism, such as a lock and key mechanism to allow the fixing of a shaft, for example, a motor drive shaft, by means of or together with a stabilizer, for example a drilling motor stabilizer and in particular, but not exclusively, for the annexation, removal and / or securing of a drilling trepan, such as a short caliber drill trepane to / from a lower end of the tree.

BACKGROUND OF THE INVENTION

Various types of well bottom engines, including positive displacement motors and turbot drills, may be suitable for driving a drilling trepan in a borehole, for example, during drilling of the borehole. Addressable high-speed motors, also known as turbot-drills or turbines, are a type commonly used in the well bottom motor and have become well known in the drilling field at the bottom of the well. During the development of the high speed airship

During the development of addressable high-speed motors, it was recognized that at high speeds, it was necessary for the motor and the trepan assembly to be stabilized in order to reduce or eliminate the tortuousness of the borehole - commonly known as spiral formation. This spiral movement that can occur at high speeds can seriously reduce drilling speed, as well as cause excessive wear of the various parts of the engine assembly. This spiral effect can be particularly severe in the case of certain types of geological formations in which the hole is formed.

In a typical drilling assembly, the drilling trepan is connected to an engine shaft located inside an engine body.

The direction of hole formation can be controlled, for example by providing a bend, a deflection device, or an eccentric stabilizer located in an appropriate position of the assembly.

During normal drilling, the engine body portion is rotated at a lower speed than the drilling trepan speed, thereby mitigating the effect of the deflection device. On the other hand, when directional or lateral drilling is required, the assembly deflection device is adjusted in a desired direction and held stationary, with the drilling trepan being turned at high speed by the motor at the bottom of the well.

In order to maximize the deviation of the borehole, the so-called trepan pendant (that is, the distance from the lower end, for example lower bearing or lower stabilizer, on the housing of the motor body to the operating face of the drilling trepan) It must be kept to a minimum.

Commonly most drill bits comprise a bolt connection (male) with an API thread to match an API thread box connection (female) on the coupling component, which can be a drill collar, sub or motor shaft However, in turbine drilling it has become common practice for the threaded connection to be reversed, the trepan is provided with the box connection.

In the drilling at the bottom of the well, the terms short gauge trepane or long gauge trepane refer to the stabilization or guide portion of the outer diameter that is used for the purposes of final trimming and guiding the trepan inside the hole created by The trepan. The gauge may include a sleeve to extend the guide portion of the trepan to a longer length. This sleeve can be manufactured as an integral part of the trepan structure. The extended sleeve portion commonly has a diameter of + - 1/32 of the nominal trepan diameter.

In the art, it is understood that a short caliber trepane means a drilling trepan with an external cylindrical portion, the length of which measures approximately one inch to 1.0 times the nominal trepan diameter. This contrasts with the so-called long caliber trephines that can have cylindrical portions, the lengths of which are in excess of once the diameter of trepan. In addition, the so-called long caliber trepans are often made of separate pieces and have a short cylindrical portion, which is part of the trepan head and a second cylindrical portion formed by a separate sleeve and attached to the trepan head. It is understood that the two cylindrical portions are combined such that the length of the cylindrical portion is in excess of once the nominal trepan diameter. The two cylindrical portions are substantially the same diameter but may be slightly different; a difference of approximately 1/32 is possible due to normal manufacturing tolerance variations.

The short caliber bitches have been used in drilling sets. However, known assemblies comprising a short caliber trepan involve the use of a stabilizer between the caliber trepan at the end of the motor body. While this type of arrangement is effective for stabilizing the trepan, the trepan pendant is significantly increased, thereby reducing the directionality of the engine assembly.

Current turbines tend to employ drill bits that have long total gauge lengths, usually from one see the nominal trepan diameter to more than twice the nominal trepan diameter. This has made it necessary to ensure that a smooth borehole occurs. However, this introduces a risk that the drilling trepane can stick to the borehole and also increases the cost of the drilling trepan.

Recent developments in drill bits have led to engine assemblies that no longer require the presence of a trepan box between the lower end of the engine shaft and the drill trepan. Such an arrangement is described in US Patent 5,853,053 (GILCHRIST et al.) While the assembly disclosed therein provides a reduction in the trepane pendant, some of the associated disadvantages may include premature stabilizer wear and a relatively high risk of that the long caliber drill trepan can be stuck in the hole.

It is an object of at least one embodiment of at least one aspect of the present invention to eliminate and / or mitigate one or more disadvantages in the prior art.

It is an object of at least one embodiment of at least one aspect of the present invention to provide a drilling motor stabilizer at the bottom of the well comprising reaming elements or reaming means provided at or near at least a portion. center of at least one stabilizer blade.

It is an object of at least one embodiment of at least one aspect of the present invention to provide a drilling trepane comprising a caliber trepan, for example, a short caliber trepan and connection means for connecting the drilling trepan to A set of drilling motor.

It is an object of at least one embodiment of at least one aspect of the present invention to provide a drilling assembly at the bottom of the well comprising an improved stabilizer and optionally a drilling trepane such as a short-bore drilling trepan and A motor assembly.

It is an object of at least one embodiment of at least one aspect of the present invention to provide fixing means or lock and key mechanism for fixing a motor drive shaft by means of or together with a motor stabilizer and beneficially allowing the use of handling and annexation and / or removal of a drilling trepan to / from the engine drive shaft.

It is an object of at least one embodiment of at least one aspect of the present invention to provide a drill assembly at the bottom of the well comprising the locking means or lock and key mechanism.

BRIEF DESCRIPTION OF THE INVENTION

In accordance with a first aspect of the present invention, a stabilizer is provided comprising at least one reaming means and / or reinforcing means.

In art, the term stabilizer is known and understood. However, it will be understood that other equivalent terms can be used in the art, for example centralizer.

The stabilizer may comprise a bottomhole stabilizer. Advantageously, the stabilizer may be a drilling motor stabilizer.

The stabilizer may comprise one or more blades, for example a plurality of blades, for example blades extending longitudinally, on or around

<td>of a</td><td>surface</td><td>external</td><td>from</td><td>the same,</td><td>spaced</td>

<td colspan="2">circumferentially.</td><td></td><td></td><td></td><td></td>

<td></td><td colspan="2">Alternatively, the</td><td>a</td><td>or more sheets,</td><td>for example</td>

<td>plurality</td><td>of leaves,</td><td>they can</td><td>be</td><td>profiled,</td><td>for example</td>

oblique or wavy in relation to an axis of rotation of the stabilizer.

The stabilizer may comprise a cylindrical body and the external surface may comprise an external surface of the cylindrical body.

Each blade may comprise at least one upper portion or outer surface.

Each blade may also comprise at least a sloping or inclined portion or surface that extends between the at least a top or outer portion or surface of the blade and a portion of the stabilizer end body or portion, for example the cylindrical body at or near a first lower end or piercing end and / or a second upper end or end thereof.

Commonly, each blade may comprise at least one edge between the at least one upper portion or surface and the at least one inclined portion or surface thereof.

Beneficially, the reaming means can be provided on at least one stabilizer sheet.

The stabilizer may comprise at least a first reaming means and / or reinforcement means provided at least in or near a first portion or portion of the lower end of the stabilizer, such first end is closer to a piercing end thereof , in service. By such provision, any variation and / or imperfection in the drilling profile that arises from the displacement of the drilling trepan of a central axis during drilling can be corrected by reaming the bore by the centralizer, thereby improving the quality of the bore.

The stabilizer may further comprise at least second reaming means and / or reinforcement means provided at least on or near a second portion of the end or portion of the upper end of the stabilizer, such a second end is further away from a piercing end. of the same in service. By such provision, additional reaming of the bore can be effected by rotation of the stabilizer during the removal of a drilling or hole traction assembly ('POOH').

Preferably, the first and / or second reaming means may comprise means, for example, reaming blocks, which protrude or extend at least partially from an upper surface of at least one blade on or on an inclined surface thereof.

The first and / or second reaming means can each have an external surface that can be substantially flat. A portion of the outermost surface of the first and / or second reaming means may be substantially level or level with the outer surface of the blade (s) on which they are provided. An additional portion of the outermost surface of the first and / or second reaming means can be provided radially externally of the respective inclined surface.

The stabilizer may further comprise at least third reaming means and or reinforcement means provided in at least one portion, for example the inclined portion, of at least one blade. By such provision, in service, the inclined portion of a blade can be protected from excessive or premature wear, for example by undercutting.

The stabilizer may further comprise at least fourth reaming means and / or reinforcement means provided on at least a portion or upper surface of at least one blade thereof.

Commonly, the third and fourth reaming means and / or reinforcing means may be partially level or level with an external surface of at least one stabilizer blade.

The stabilizer may further comprise at least fifth reaming means and / or reinforcement means provided at least partially along at least one longitudinal edge of at least one blade.

Conveniently, the at least fifth reaming means and / or reinforcing means may be provided at least partially along or near a longitudinal edge of at least one front blade substantially towards a direction of rotation of the stabilizer, in service. By such provision, the performance of the reaming can be improved and / or the at least one blade can be protected from excessive or premature wear, for example by undercutting.

Commonly, the first, second, third and fifth reaming means and / or reinforcing means may comprise blocks and / or may be made of a diamond impregnated material, for example a diamond impregnated tungsten carbide material.

Commonly, the fourth reaming means and / or reinforcing means can be made of an optionally impregnated diamond tungsten carbide material.

Beneficially, the fourth reaming means and / or reinforcing means may comprise blocks, for example a mixture of formed blocks, such blocks can be made of a tungsten carbide material and / or a diamond impregnated tungsten carbide material .

Reaming block or reinforcement blocks made of different materials can be provided with different shapes.

Commonly, the reaming blocks made of a diamond impregnated tungsten carbide material are provided in a circular, hexagonal or octagonal shape and the reinforcing blocks made of an unreinforced tungsten carbide material can be provided in a rectangular shape.

Preferably, the reaming means and / or reinforcing means may be provided on a blade of the stabilizer.

Alternatively, the reaming means and / or reinforcement means may be provided on more than one sheet, for example one sheet yes and another sheet no, of the stabilizer.

Preferably, the reaming means and / or reinforcing means may be provided on the same blade of the stabilizer.

Alternatively, each of first, second, third, fourth and fifth reaming means and / or reinforcement means may be independently provided on one or more stabilizer blades.

The first, second, third, fourth and / or fifth reaming means and / or reinforcement means may comprise combined reaming and reinforcement means.

It will be understood that the reaming elements provided on the stabilizer of the present invention can fulfill their function when the stabilizer is in rotational motion, for example during normal drilling mode.

Advantageously, the first, second, third, fourth and / or fifth reaming means and / or reinforcement means can be made of a harder material than in the stabilizer body.

Commonly, the stabilizer can be made of a low carbon alloy steel, for example AIS14145 steel.

Advantageously, the stabilizer can be a drilling motor stabilizer at the bottom of the well.

In accordance with a second aspect of the present invention, a drilling trepan is provided comprising a calibration trepan at or near a drilling end thereof and connecting means for connecting the drilling trepan to a drilling motor assembly. , wherein the drill trepan caliper may comprise a substantially cylindrical portion having a length less than or equal to about 1.0 times the nominal trepan diameter and commonly in the range of 2.5 cm (one inch) to

1.0 times the nominal trepan diameter.

By such an arrangement the drilling trepane can be called a short calibration trepan. The drill trepan caliper can have a length in the range of 2.5 cm (one inch) to 20 cm (8 inches), commonly 5 cm (2 inches) to 15 cm (6 inches).

Beneficially, the drilling trepan can be devoid of a trepan sleeve. By such provision, the drilling trepane can depend solely on the integral matrix calibrator for stabilization. In addition, the trepane pendant can be significantly reduced, thereby improving the addressability of the engine assembly and decreasing the likelihood of the drilling trepan becoming stuck. Still further, in the event that the drilling trepan is stuck, the force required to release the piercing trepan can be reduced. In the event that the drilling trepane cannot be released, the repetitive application of a tensile and / or shaking force on the drilling trepan can cause the drilling trepan to break, thereby avoiding the need to abandon a section of the bottom hole assembly and / or the hole, thus reducing operating costs in such circumstances.

The connection means, for example a threaded connection, can connect the drill trepan to a motor shaft of the drill motor assembly.

Commonly, the connection means, for example a threaded connection, may comprise an externally threaded bolt configured to engage and connect and the connection with a receiving portion, for example, an internal threading of a portion of the lower end of the shaft. By such provision, the need for a connector, for example a trepan box, is eliminated between the drill trepan and the end of the drill motor assembly, for example, the motor shaft.

Conveniently, the piercing trepane may further comprise a neck portion provided for example at or near an upper end of the calibration trepan to allow clamping, for example, by a trepan fastener.

Commonly, the drilling trepane can be made of a diamond impregnated carbide material with an appropriate binder material.

According to a third aspect of the present invention, an assembly is provided, such as a bottomhole assembly, which comprises at least one stabilizer in accordance with the first aspect of the present invention and / or comprising a drilling trepan. according to the second aspect of the present invention.

Advantageously, the assembly may comprise a drilling assembly.

The assembly may further comprise a drilling motor assembly.

Preferably, the stabilizer can be provided at a lower end of the drilling motor assembly, this is an end closer to a drilling end thereof.

Commonly, the perforation motor assembly may comprise a tubular motor body portion suitable for selective rotational movement, a motor shaft provided within or within the tubular motor body portion and means of annexing the drilling trepan provided in or near a portion of the lower end of the motor shaft.

Commonly also, the tubular motor body portion can be attached and / or rotationally connected to the stabilizer. By such provision, the rotational movement of the motor body portion can cause rotational movement of the stabilizer, for example during normal drilling. Conversely, in the absence of rotational movement, the portion of the motor body, for example during directional or lateral drilling, may cause the stabilizer to remain stationary in relation to the motor shaft.

Commonly, a portion of the lower end of the shaft can be provided with a receiving portion, for example an internal threading to which the connection means are received, for example a threaded connection such as an externally threaded internal of the drill trepan.

The assembly may be devoid of a connector, for example a trepan box, between the drill trepan and a lower end or drill end of the drill motor assembly, for example motor shaft.

Conveniently, a portion of the lower end of the stabilizer may be substantially level or level with a portion of the lower end of the motor shaft and / or portion of the motor body.

Conveniently, the piercing trepane may further comprise a neck portion provided, for example at or near an upper end of the piercing trepan to allow for grip for example by a trepan fastener.

The shape of the stabilizer can be substantially concentric in relation to the motor shaft and / or portion of the motor body.

Alternatively, the shape of the stabilizer may be concentric or eccentric in relation to the motor shaft and / or portion of the motor body.

The outer diameter of the stabilizer can be substantially identical to the full-bore diameter of the drill trepan, that is, 0 to 0.32 cm (1/8 inches) of the nominal hole size.

Alternatively, the stabilizer may show a displacement, such that at least one blade displaced from the stabilizer can sweep a radius equal to or greater than the calibration radius of the trepane. Commonly, the displacement radius may be 0 to +3 mm of the radius of the trepan caliper.

The drilling motor assembly may comprise a deflection device, for example, a displaced stabilizer or a bend.

Advantageously, when the shape of the stabilizer of the present invention is concentric or eccentric in relation to the motor shaft and / or portion of the motor body, the eccentric or eccentric stabilizer can be aligned with and / or in relation to the deflection device. By such provision, the deflection of the drilling assembly can be adjusted, improved and / or increased by means of the deflection device, by aligning the concentric or eccentric stabilizer, with and / or in relation to the deflection device.

Beneficially, the drilling trepan can be devoid of a trepan sleeve. By such provision the drilling trepane can depend solely on the integral matrix gauge for stabilization and the trepan pendant can be significantly reduced, thereby improving the addressability of the engine assembly.

Commonly, the drilling trepan can comprise a substantially cylindrical portion having a length less than or equal to about 1.0 times the nominal trepan diameter and commonly in the range of 2.5 cm (one inch) to 1.0 times the nominal trepan diameter. By such provision, the drilling trepane can be called a short caliber trepan.

The drill trepan caliper can have a length in the range of 2.5 cm (one inch) to 20 cm (8 inches), commonly 5 cm (two inches) to 15 cm (6 inches).

Commonly, the distance between a lower end or drill end of the motor body, for example motor shaft and / or stabilizer and the trepan caliper

<td>can be of the order</td><td>from</td><td>2.5 cm (one inch) to</td><td>20 cm (8</td>

<td>inches), commonly</td><td>5 cm</td><td>(two inches) to 15 cm (6</td><td>inches).</td>

<td>Commonly,</td><td>the</td><td>drilling trepan</td><td>can be</td>

made of a diamond impregnated carbide material with an appropriate binder material.

Commonly, the drilling assembly may be a borehole drilling assembly.

According to a fourth aspect of the present invention, fixing means or a lock and key mechanism suitable for fixing a drive shaft by means, together with or in relation to a stabilizer are provided.

Beneficially, the fixing means are suitable for temporarily and / or releasably fixing the drive shaft and the stabilizer.

Advantageously, the drive shaft is a motor drive shaft and / or the stabilizer is a drilling engine stabilizer.

By such provision, a portion of the lower end of the shaft provided below or inside the stabilizer can be held in position as long as a drilling trepan is attached or detached from / to the shaft.

Commonly, the locking means or lock and key mechanisms may comprise lock means and key means.

The lock means may comprise at least one opening, hole or slot provided in or through a portion of the stabilizer of at least one receiving or fixing portion provided on at least a portion of the motor drive shaft.

Conveniently, in service, the one of at least one stabilizer opening may be aligned with the at least one receiving or fixing portion of the motor shaft.

The at least one opening can be covered or protected so that it can be opened with cover means, for example a flap or cover. Such an element may seek to prevent, in service, the entry, exit or accumulation of debris or perforation particles in or near the opening.

Commonly, the key means may comprise at least one operating portion and at least one coupling portion.

Conveniently, the shape and size of the at least one opening portion may be such that the at least one engaging portion of the key means may be inserted therethrough.

Conveniently, the at least one receiving portion or fixing portion of the shaft may be capable of receiving the at least one engaging portion of the key means.

Commonly, the at least one receiving portion or fixing portion of the shaft may comprise for example a groove and the at least one coupling portion of the key means may be, for example, T-shaped.

Commonly, the tree can be provided with one or more, for example two receiving or fixing portions, optionally diametrically opposed to each other.

Commonly also, the stabilizer can be provided with one or more, for example two openings.

Preferably, the locking means or lock and key mechanism may be suitable for a drilling motor assembly at the bottom of the well.

Preferably, the drilling motor stabilizer may be a stabilizer in accordance with the first aspect of the present invention.

In accordance with a fifth aspect of the present invention, a drilling assembly is provided at the bottom of the well comprising at least one locking means or lock and key mechanism in accordance with the fourth aspect of the present invention.

Preferably, the bottom hole drilling assembly may further comprise a stabilizer in accordance with the first aspect of the present invention and / or a drilling trepan according to the second aspect of the present invention and optionally a drilling assembly of the motor.

In accordance with a sixth aspect of the present invention, a stabilizer is provided comprising at least one opening, hole or groove of the lock fastening means of the fastening means or lock and key mechanism according to the fourth aspect of the present invention.

Preferably, the stabilizer is a stabilizer according to the first aspect of the present invention.

In accordance with a seventh aspect of the present invention, the key means for fixing a drive shaft is provided by means of, together with or in relation to a stabilizer.

In accordance with an eighth aspect of the present invention, a shaft is provided comprising at least a receiving portion or fixing portion, for example a slot, suitable for receiving at least a coupling portion of the key means of the fastening means or lock and key mechanism according to the fourth aspect of the present invention.

BRIEF DESCRIPTION OF THE FIGURES

Modalities of the present invention will now be described by way of example only and with reference to the attached figures, which are:

Figure 1 is a side view of a drilling motor stabilizer according to a first embodiment of the present invention;

Figure 2 is an enlarged side view of a perforation end of the stabilizer of Figure 1;

Figure 2a is an enlarged cross-sectional view of part of the piercing end of Figure 2;

Figure 3 is a perspective view of an upper part of the stabilizer of Figure 1;

Figure 4 is a side view of an alternative embodiment of the drilling motor stabilizer of Figure 1, showing an eccentric stabilizer.

Figure 5 is a perspective view of a drilling trepan according to a second embodiment of the present invention;

Figure 6 is a side view of a first drilling assembly comprising the stabilizer of Figure 1 and the drilling trepane of Figure 5;

Figure 7 is a side view of a second drilling assembly comprising a modified stabilizer similar to that of the stabilizer of Figure 1;

Fig. 8 is an additional side view of the drilling assembly of Fig. 7 with a drill cutter removed and key means in a coupled position;

Figure 9 is a front perspective view of a lower end of a motor drive shaft and stabilizer of the drilling assembly of Figure 7, showing the key means coupled with fixing means;

Figure 10 is a side sectional view of a lower end of the drilling assembly (stabilizer not shown) of Figure 7, showing the key means coupled with the fixing means and Figure 11 is a side view of the assembly of drilling of figure 6 or figure 7 with a drill trepan removed.

DETAILED DESCRIPTION OF THE FIGURES

Referring to Figures 1 to 4, a perforation motor stabilizer 5 according to a first embodiment of the present invention is shown.

The stabilizer 5 comprises reaming means and / or reinforcing means 10.

The stabilizer 5 comprises a plurality of blades 20, for example blades that extend longitudinally on or about an external surface 4 thereof, for example, circumferentially spaced.

The stabilizer 5 comprises a cylindrical body 8 and the outer surface 4 comprises an outer surface of the cylindrical body 8. Each blade 20 comprises at least one upper or outermost portion or surface 22.

Each blade 20 also comprises at least a sloping or inclined portion or surface 23 extending between the at least a portion or outermost surface 22 of the blade 20 and a body portion 8 or end portion 9 of the stabilizer of 5, for example of the cylindrical body, at or near a first or lower end or piercing end 6 and / or a second or upper end 7 thereof.

Commonly, each blade 20 comprises at least one edge 21 between the at least one upper portion or surface 22 and the at least one inclined portion or surface 23 thereof.

Beneficially, the reaming means and / or reinforcing means 10 are provided on at least one blade 20 of the stabilizer 5.

The stabilizer 5 comprises first reaming means 11 provided at least at or near a first portion or portion of the lower end 6 of the stabilizer 5, such first end 6 is closer to a piercing end thereof, in service.

The stabilizer 5 further comprises second reaming means 12 provided at least on or near a second portion of the end or portion of the upper end 7 of the stabilizer 5, such a second end 7 is further away from the drilling end thereof, in service .

As can be seen in Figures 2 and 3, in this embodiment the first and / or second reaming means 11,12 comprise reaming blocks, 12a prominent or extending at least partially from one end of an upper surface 22 of at least one blade 20 on or at an inclined surface 23 thereof.

The first and / or second reaming means 11,12 each have a more external surface, which is substantially flat.

A portion of the outermost surface of the first and second reaming means 11,12 is substantially level or level with the outermost surface 22 of the blade (s) 20 on which they are provided. An additional portion of the outermost surface of the first and / or second reaming means 11,12 is provided radially outwardly of the respective inclined surface 23.

In another embodiment, the stabilizer 5 optionally further comprises third reaming means or reinforcement means 13 provided on at least one portion, for example the inclined portion 23, of at least one blade 20. By such provision the inclined portion 23 of a blade 20 is protected, in service, from excessive or premature wear, for example by undercutting.

The stabilizer 5 further comprises fourth reaming means 14a or reinforcing means 14b provided on at least a portion or upper surface 22 of at least one blade 20 thereof.

Commonly, the third 13 and fourth 14a, 14b reaming and / or reinforcement means are substantially level or level with an outer surface 25 of at least one blade 20 of the stabilizer 5.

As shown in Figures 1 and 2, the stabilizer further comprises at least fifth reaming means and / or reinforcement means 15 provided at least partially along the longitudinal edge 26 of at least one blade 20.

In this embodiment, the at least fifth reaming means and / or reinforcing means 15 are provided at least partially along a longitudinal edge 26 facing substantially towards a direction of rotation of the stabilizer 5, in service. By such provision, the reaming performance is improved and / or the at least one blade 20 is protected from excessive or premature wear, for example, by undercutting.

Commonly, the first 11, second 12, third 13 and fifth 15 reaming and / or reinforcement means comprise blocks and / or are made of a diamond impregnated material, for example a diamond impregnated tungsten carbide material.

Commonly, the fourth reaming means 14a or reinforcement means 14b are made of an optionally impregnated diamond tungsten carbide material.

The fourth reaming means 14a or reinforcing means 14b comprise blocks 14c made of a diamond impregnated tungsten carbide material and blocks 14d made of a tungsten carbide material.

In this embodiment, the reaming blocks or reinforcing blocks 14d made of different materials are provided with different shapes.

The reaming blocks 14c made of a diamond impregnated tungsten carbide material are provided in a circular, hexagonal or octagonal shape and the reinforcing blocks 14d made of an unreinforced tungsten carbide material are provided in a rectangular shape.

In this embodiment, the reaming and / or reinforcing means 11, 12, 13, 14a, 15 comprise reaming and combined reinforcement means, for example they provide both a reaming and reinforcing function, while the reinforcement means 14b provide a function reinforcement

In this embodiment, the reaming and / or reinforcement means 11, 12, 13, 14a, 15 and / or the reinforcement means 14b are provided on a blade 20 of the stabilizer 5.

In an alternative embodiment, the reaming and / or reinforcement means 11, 12, 13, 14a, 15 and / or the reinforcing means 14b are provided on more than one blade 20, for example each blade of the stabilizer 5.

In this embodiment, the reaming and / or reinforcement means 11, 12, 13, 14a, 15 and / or the reinforcing means 14b are provided on the same blade 20 of the stabilizer 5.

In another embodiment, each of the first, second, third, fourth and fifth reaming and / or reinforcement means 11, 12, 13, 14a, 15 and / or the reinforcing means 14b are independently provided on one or more blades of the stabilizer.

It will be understood that the reaming means 10 provided on the stabilizer 5 of the present invention can fulfill their function when the stabilizer 5 is in rotational motion, for example during the normal drilling method.

The reaming and / or reinforcement means 11, 12, 13, 14a, 15 and / or the reinforcing means 14b are made of a harder material than the material of the body 8 of the stabilizer 5.

Commonly, the stabilizer 5 is made of a low carbon alloy steel, for example an AISI4145 steel.

Advantageously, the stabilizer 5 is a drilling motor stabilizer at the bottom of the well.

Referring to Figure 5, a drill bit according to a second embodiment of the present invention 40 is provided comprising a calibration bit 42 at or near a drill end 4 5 thereof, and connection means 46 for connecting the drill bit 40 to a drill motor assembly. The connection means 46, for example a threaded connection, are provided to connect the drill bit 40 to a motor shaft of the drill motor assembly.

In this embodiment, the connection means 46 comprise a threaded connection, for example an externally threaded bolt 47 configured to engage and connect with a receiving portion, for example an internal threading of a portion of the lower end of the shaft. By means of such provision, the need for a connector, for example a trephine box, between the drill bit 40 and the end of the motor body, for example motor shaft, is eliminated.

Conveniently, the drill bit further comprises a neck portion 50 provided at or near an upper end of the calibration bit 42 to allow for grip, for example by a drill bit.

In this embodiment, the neck portion 50 comprises two diametrically opposed flat portions 55 to allow grip, for example by a trephine fastener.

Advantageously, the drill bit 40 is devoid of a sleeve of the drill.

Commonly, the drill bit 40 comprises a substantially cylindrical portion gauge 42 having a length less than or equal to about 1.0 times the nominal trepan diameter, and commonly in the range of 2.5 cm (1 inch) to 1.0 times the diameter of nominal trepan.

By such provision, the drill bit 40 may be referred to as a short gauge drill 41.

The drill bit gauge 42 may have a length in the range of 2.5 cm (1 inch) to 20 centimeters (8 inches) commonly 5 cm (2 inches) to 15 centimeters (6 inches).

Commonly, the drill bit 42 may be made of a diamond impregnated carbide material with an appropriate binder material.

Referring now to Figure 6, a joint drilling assembly 30 is provided comprising a stabilizer 5 according to the first embodiment of the present invention, a drilling bit 40 according to the second embodiment of the present invention, and an assembly of drilling motor 60.

The stabilizer 5 is provided at a lower end of the drilling motor assembly 60, that is, an end closer to a drilling end 45 thereof.

Commonly, the perforation motor assembly 60 comprises a tubular motor body portion 65 suitable for selective rotational movement, a motor shaft provided within or within the tubular motor body portion, and annealing means of the perforation drill. provided in or near a portion of the lower end of the motor shaft.

Commonly also, the body portion of the tubular motor 65 is attached and / or rotationally connected to the stabilizer 5. By such provision, the rotational movement of the motor body portion 65 causes rotational movement of the stabilizer 5, for example during normal drilling . Conversely, the absence of rotational movement of the motor body portion 65, for example during directional or lateral drilling, causes the stabilizer 5 to remain stationary in relation to the motor shaft.

Commonly, a portion of the lower end of the shaft is provided with an internal thread to which an externally threaded bolt 47 of the drill bit 40 is received.

The assembly is devoid of a connector, for example a tread box, between the drill bit 40 and a lower or piercing end of the motor body 65, for example motor shaft.

Conveniently, a portion of the lower end of the stabilizer 5 is substantially level or level with a portion of the lower end of the motor shaft.

Preferably, the drill bit 40 is a short gauge drill bit 41. In the art, it is understood that a short gauge drill bit means a drill bit with an external cylindrical portion, the length of which measures less than or equal to approximately 1.0 times the nominal trepan diameter, and commonly, in the range of 2.5 cm (1 inch) to 1.0 times the nominal trepan diameter.

Conveniently, the drill bit 40, 41 comprises a neck portion 50 to allow grip, for example by a trephine fastener.

In one implementation, as shown in Figures 1 to 3, the shape of the stabilizer 5 is substantially concentric in relation to the motor shaft.

In this embodiment, the outer diameter of the diameter of the stabilizer 5 is substantially identical to the full-bore diameter of the drill bit 40, 41, that is 0 to 0.32 cm (1/8 inch), of the nominal hole size.

In another implementation, as shown in Figure 4, the shape of the stabilizer 5 is concentric or eccentric in relation to the motor shaft. The stabilizer 5 shows a displacement, such that a displaced blade 20a of the stabilizer 5 sweeps a radius equal to or greater than the radius of the trepan caliber. Commonly, the displacement radius is 0 to +3 mm of the caliber of the trepan.

Beneficially, the drill bit 40, 41 is devoid of a drill sleeve. By such provision, the drill bit depends solely on the integral die gauge for stabilization and the drill bit is significantly reduced, thereby improving the addressability of the engine assembly.

The borehole drill gauge 42 has a length in the range of 2.5 cm (1 inch) to 20 cm (8 inches), commonly 5 cm (2 inches) to 15 cm (6 inches).

The distance between a lower end or piercing end of the motor body 65, for example motor shaft and / or stabilizer 5 and the caliper 42 gauge is in the range of 2.5 cm (1 inch) to 20 cm (8 inches) , commonly 5 cm (2 inches) to 15 cm (6 inches).

Commonly, the drill bit 40, 41 is made of a diamond impregnated carbide material with an appropriate binder material.

Commonly, the drilling assembly 30 is a drilling assembly at the bottom of the well 31.

Referring to Figures 7 to 10, a piercing assembly 30 'is provided comprising a stabilizer 5' in accordance with a third embodiment of the present invention. The 5 'stabilizer comprises fixing means or lock and key mechanism 80.

The fixing means or lock and key mechanism 80 are suitable for temporarily and / or releasably fixing a drive shaft 70 'by means of or together with a 5' drilling motor stabilizer.

Advantageously, the drive shaft 70 'is a drive shaft of the motor 71' and / or the stabilizer 5 'is a stabilizer of the drilling motor.

By such provision, a portion of the lower end of the shaft 70 'provided below or inside the stabilizer 5' can be held in position as long as a drill bit 40 'a / of the shaft 70' is attached or detached.

Commonly, the locking means or lock and key mechanism comprise lock means 90 and key means 100.

The lock means 90 comprise at least one opening, hole or slot 91 provided in or through a portion of the stabilizer 5 ', and at least a receiving portion or lock portion 95 provided on at least a portion of the shaft 70 'motor impeller.

Conveniently, in service, the one of the at least one of the openings 91 of the stabilizer 5 'is aligned with the at least one of the receiving or fixing portions 95 of the motor shaft 70'.

The at least one opening 91 is covered or protected so that it can be opened by means of cover 92, for example a flap or cover. Such an element may seek to prevent, in service, the entry, exit or accumulation of debris or perforation particles in or near the opening 91.

Commonly, the key means 100 comprise at least one operating portion 101 and at least one coupling portion 102.

Conveniently, the shape and size of the at least one opening portion 91 is such that the at least one coupling portion 102 of the key means 100 can be inserted therethrough.

Conveniently, the at least one receiving portion or fixing portion 95 of the shaft 70 'is capable of receiving the at least one coupling portion 102 of the key means 100.

Commonly, the at least one receiving portion or lock portion 95 of the shaft 70 'comprises for example a groove, and the at least one coupling portion 102 of the key means 100 is for example in the form of a T.

Commonly, the shaft 70 'is provided with one or more, for example two receiving or fixing portions 95, optionally diametrically opposed to each other.

Commonly also, the 5 'stabilizer is provided with one or more, for example two openings 91.

Preferably, the 5 'drilling motor stabilizer is a stabilizer according to the first embodiment of the present invention.

Preferably, the locking means or lock and key mechanism 80 are suitable for a drilling motor assembly at the bottom of the well 31 '.

Preferably, the bottom hole drilling assembly 31 'comprises a stabilizer 5', a drill bit 40 ', and a drilling motor assembly 60'.

Referring now to Figure 11, a drilling assembly 30, 30 'is provided comprising a stabilizer 5.5' in accordance with a first or third embodiment of the present invention, a drilling motor assembly 60, 60 ', and a drill bit according to a second embodiment of the present invention (not shown).

In one implementation, the drilling motor assembly 60, 60 'comprises a deflection device 110, 110', for example a displaced stabilizer or a bend.

When the shape of the 5.5 'stabilizer of the present invention is concentric or eccentric in relation to the 70,70' motor shaft and / or 65, 65 'motor body portion, the 5.5' eccentric or eccentric stabilizer it can be aligned with and / or in relation to the deviation device 110,110 '. By such provision, the deflection of the drilling assembly 30, 30 'by the deflection device 110,110' can be adjusted, improved and / or implemented by aligning the 5.5 'acentric or eccentric stabilizer with and / or in relation to the device deviation 110, 110 '. Typically, the deflection will occur in a direction opposite to the displaced blades 20a of the 5.5 'stabilizer.

It will be appreciated that the embodiments of the present invention described hereinbefore are given by way of example only and are not intended to limit the scope thereof in any way.