Well instrument pressing device

The invention relates to geophysical research of wells and is intended for use in downhole geophysical instruments, in particular in sections of multi-instrument seismic probes.

Known downhole device clamping device, consisting of a housing, self-jamming spacers with a curved working surface, a spring-loaded push rod, a locking mechanism with a tracking antenna and an eccentric cam, rods that act as remote supports for self-jamming spacers, which, in turn, are pivotally connected with a spring-loaded push rod, and the follower antenna in the locking mechanism is mounted on a spring-loaded swinging carriage, articulated to an eccentric cam C1J.

The disadvantages of this device are the single opening and the absence of contraceptive devices.

Closest to the proposed one is a downhole tool clamping device comprising a housing, springs, a spacer element, a rod pivotally connected to a spacer element and connected to a cable on which the downhole tool is suspended, a release mechanism in which the follower must be mounted on a spring-loaded swinging carriage pivotally connected by a cam, the thrust, which is an external support for the spacer element G2].

The disadvantage of this device is that it is also a single opening. Once opened in the well, it can only move up to the day surface, and it cannot be lowered deeper into the well, which is not possible. It manages to maneuver the device along the well and restrains the increase in productivity at the well.

The purpose of the invention is to increase the productivity of the downhole tool by providing the ability to control its clamping device.

This goal is achieved by the fact that in the clamping device of the downhole tool, comprising a housing, springs, a spacer element, a rod pivotally connected to a spacer element and connected to a cable on which the downhole tool is suspended, a release mechanism in which the follower antenna is mounted on a spring-loaded swinging cable -. rod, pivotally connected to the cam, the thrust, which is a remote support 'for the spacer element, the rod consists of two parts, the upper and lower, in the junction of which the release mechanism is located, and the rod parts are interconnected by means of a flat axis 5 and are made with the possibility of their longitudinal movement inside the housing, both together and separately.

In this case, the lower part of the rod is made · with a socket for an axis with baldheads.10., Turning into a longitudinal groove, | is connected by a cable with a load, and the spacer element and rod are connected to the body, the upper part of the rod at the bottom is equipped with an eye in which there are 15 axes with flats installed without the possibility of rotation about this axis, the cam of the release mechanism.

Figure 1 shows the clamping device of the downhole tool before lowering into the well in a state in which the spacer arm is recessed; figure 2 is the same in a state in which the spacer lever of the pressing device is open and the downhole tool is fixed to the well; in Fig.3 is a detail of the release mechanism, node I in Fig.2; in Fig. 4, the clamping device is in a state when the spacer lever is open, the release mechanism is in the initial position, the device can move up; figure 5 - the same, in a state where the spacer lever is closed (recessed in the housing) to the end, and the downhole tool, moving up, experiences a sticking well.

The clamping device of the downhole tool consists of a casing. 1, inside of which there is a clamping part 40, two springs and a release mechanism. The housing 1 at the ends is equipped with lugs 2 and 3 and has a longitudinal window 4 through which the spacer lever 5 and the rod 6 can be exposed 45 (FIGS. 2 and 4).

Inside the housing 1, a guide bed 7 is provided for the lower part 8 of the rod, at the bottom, a cavity 9 for the damper spring 10, in the upper tip 2, a cavity 11 for the anti-gripping spring 12.

The rod consists of two parts: the upper 13 and the lower 8. The upper part 13 at the bottom has an eye 14, in which the cam 16 of the release mechanism is rotated relative to this axis 15 on the axis 15 with flats uk55. The upper part 13 of the rod is directly connected to the armor of the cable 17. The lower 60 part 8 at the top under the axis 15 has a socket 18, and under its flats a longitudinal groove 19 connected to the socket 18. In the lower part 8 of the rod in the socket there is a hinge axis 20 for 65 spacers lever 5.

Using the spacer lever 5 and rod 6, the lower part 8 of the rod is connected to the housing 1. The lower part 8 of the rod is also connected to the armor of the cable 21, which goes to the lower load 22 (device).

The lower and upper parts 8 and 13 of the rod are made with the possibility of some longitudinal movement separately and, together inside the housing 1, they are interconnected by means of a flat axis 15, on which the cam 16 is fixed in its middle part.

The spacer lever 5 is a rod ending on one side with a curvilinear end and, on the other, with a locking socket for the hinge axis 20. The spacer lever 5 is connected via a pivot axis 23 to a rod 6, and it is connected to the body via a pivot axis 24.

The anti-gripping spring 12 is constantly locked in the upper tip 2 with a captive sleeve 25.

The release mechanism includes an axis 15 with flats, spring-loaded spring 26 relative to the upper part of the rod 1 · 8, cam 16, on which, in turn, the swinging carriage 27 with the follower mustache 28 is spring-loaded.

The clamping device of the squeegee device operates as follows.

During the descent, the spacer lever 5 is recessed inside the housing 1, the cam 16 occupies the position shown in FIG. 1, and the follower antenna 28 monitors the wall of the well (well not shown).

When lifting the device, the follower antenna 28 enters the spacer with the wall of the well and through the swinging carriage 27 rotates the cam 16 clockwise together with the axis 15. During this rotation, when the flats of the axis 15 coincide with the side walls of the longitudinal groove 19, the lower part 8 of the rod the action of the load 22 goes down, exposes the spacer lever 5 outside the housing 1 and catches the damper spring 10 in the cavity 9 (figure 2).

Thus, under the action of the weight of the lower part 8 of the rod and the lower load 22, the spacer lever 5 tends to occupy an extreme extended position. If, at the same time, the spacer lever 5 reaches the borehole wall and the lifting of the device is stopped, then it will wedge and freeze in the borehole.

In this position, the cable 17 is tensioned only under its own weight and the weight of the upper part 13 of the rod.

If the cable 17 is slightly lowered, then the axis 15 gets into its socket 18 and the cam 16 under the action of the spring 26 becomes in its original position (figure 4).

To move the device upwards · pull on the cable 17, then it carries along the lower and upper parts 8 and 13 of the rod and the load 22, which leads to the removal / 'of the spline, and the downhole tool begins to move upward, touching the walls of the well with the housing 1 and the end the spacer lever 5. In this case, the cable 17 is tensioned, and the position of the spacer lever 5 and rod 6 is consistent with the direction of movement of the device.

When the device enters the normal part of the well from the cavity, the spacer lever 5 is folded to the size of the well, because in this case, for some moment, the movement of the housing 1 is slowed down or suspended, the lower and upper parts 8 and 13 of the rod continue to move upward under the influence of the cable tension 17. If the lever 5 is folded so that the follower antenna 2 touches the borehole wall and rotates the axis 15, then the upper part 13 of the rod moves higher and the situation shown in FIG. 2 occurs.

Further, as the lower and upper parts of the rod 8 and 13 move upward, the spacer lever 5 is retracted into the housing 1. There comes a time when the housing 1, having parted from the well wall under the action of the spring 10 and its own weight, goes down relative to the lower ones hanging on the cable 17 and the upper parts 8 and 13 of the rod and through the rod 6 sends the pressure lever 5 to its original position, the lever is closed (figure 5).

In the state of FIG. 5, the downhole tool can be lowered down again without lifting it to the day surface, i.e. without loss of time for lifting the device to the day surface for refueling the lever.

, The use of the invention provides control of the clamping lever of the downhole tool in the well from the day surface by maneuvering with a cable.

The downhole tool clamping device does not need electric motors, pumps, seals, additional electrical cores, etc., which are usually equipped with a controlled clamping device.Therefore, this downhole tool clamping device is simpler, more reliable and cheaper in comparison with the known clamping devices.

The downhole tool clamping device can be used in multi-instrument seismic probes for its purpose in each section, as well as a load clamping device, without additional use of cable cores.

The downhole tool clamping device can also be used for its intended purpose in industrial geophysical instruments in order to reduce the wear of instrument elements in contact with the borehole walls.

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