Method for periodical chemical reagent injection into object to be treated

The invention relates to oil and gas industry and can be used for periodically feeding chemicals into the treatment system (object), in particular into a well conduit.

Known method of supplying chemicals (corrosion inhibitors, paraffin and salt) with metering pumps (G.Z.Ibragimov, N.I.Hisamutdinov. Handbook on the use of chemicals in the oil. - M: Nedra, - 1983, .32), the lack of which is the need for constant monitoring of the operation of the pumps, as well as the lack of a large portion of the periodic injection of reagent into the well.

There is a method in wells supplying chemical mode kapleistecheniya under hydrostatic pressure (AS USSR №1270300, Newsletter №42, 1986). It is intended for continuous injection of small volumes of reagents (2-8 l / day), while the periodic reactant supply in a volume of 50-200 liters is not possible.

There is a method pumpless inhibitor supply into the well with the help of blood vessels, high pressure metanolnits (TM Bakirov, Shatalov AT gathering and preparation for transport of natural gas. - M: Science -1986, p.60), which are used for constant or periodic supply of methanol into the pipeline in order to prevent the formation of hydrates. Inhibitor flows by gravity into the gas flow by hydrostatic pressure when leveling the pressure in the methanol tank and piping. The disadvantage of this method is the difficulty of accurate dosage of the reagent, as well as the absence of the possibility of downloading other objects.

The closest to the claimed method is a method for the periodic injection of reagents using a mobile pumping equipment (Ibragimov GZ Chemicals in oil. - M: Nedra - 1986, p.41). The disadvantage of this method is the high error when injecting small amounts of reagent which can reach 50%.

The present invention is to improve chemical injection into the treatment system (object).

The positive effect of the use of the invention is to increase turnaround time and improving the reliability of the processing system (object).

The goal is achieved by a method for the periodic feeding of chemicals into the treatment system (object) includes introducing the chemical reagent under pressure, as a source of pressure gas is used, wherein, based on the conditions and parameters of operation selected system (the object) is determined processing mode Depending on the composition and properties of the treated system (object), connect the gas source and a container of chemicals with (object) treatment chemical reagent is pumped into the system (object) treatment without her (it) stops or conduct technological shutter and start-up. The gas can be used passing, the natural or inert gas processed by the system (the object) may be processing annulus and / or the wellhead and / or terrestrial communications. By the treatment regimen include the amount of injected chemicals, frequency of feeding, while keeping the chemical reagent in the processing system (object).

Implementation of the method with chemical injection into the well or pipeline is as follows.

Example 1. Lines 1 and 2 (Figure 1) from the annulus of wells A and B are tied to a fixed capacity of 3, and compressed pressure higher than the working factor of 1.5. Next the container 3 is filled with chemicals and determine the pressure in the annulus by opening valves 4, 5, the valves 6 and 7. For the injection it is necessary that the pressure P1 in the well A exceeds the pressure P2 in the treated wells B no less than 0.2 MPa. This pressure difference created by the accumulation of gas in the annulus A by briefly overlapping gate 8 on the wellhead wells A and control gauges 9, 10. After reaching the estimated differential pressure valve 11 is opened to the wellhead of the well A gas from the annulus enters container 3, displacing the chemical reagent in line 2, and the open valve 12 and enters the reactant annulus B. After the supply of reagent in the well is shut valves 11, 12 and produce gas venting through valve 13.

Example 2. Lump reagent injection into the pipeline 1 (2) produced as in Example 1. Pre-gas discharge line 2 of the annulus tied to the fixed capacitance 3 and the pipe 1, after which the compressed pressure higher than the working factor of 1.5. After filling the container 3 reagent determine the pressure in the annulus and the pipe 1 by opening valves 4, valves 5, 6. For the injection it is necessary that the pressure P1 in the wellbore exceeds the pressure P2 in the treated pipe 1 is not less than 0.2 MPa. This pressure difference created by the accumulation of gas in the annulus by briefly overlapping gate 7 on the wellhead and well control gauges 8, 9. After reaching the estimated differential pressure open valves 10, 11 and the reagent from the tank 3 to the pipeline 1. After reagent feed in conduit 1 is closed valves 10, 11 and produce gas venting through valve 12.

The proposed method can effectively carry out the processing of oil facilities by various chemicals, using associated gas.