RU2475631C1 - Plant for simultaneous-separate pumping of working agent - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: plant includes long tubing string with packer and short tubing string located in well. Long tubing string has bottom-upwards connection pipe with locking ring and highly tight couplings or couplings with outside diameter 2 mm less than standard ones, production packer, connection pipe, tubing string assembled based on highly tight couplings or couplings with sealant on thread, eccentric. Tubing string is located in well with possibility of its tension and attachment in tense condition to wellhead equipment. Short tubing string is assembled based on couplings by thread with sealant, it has bottom-upwards coupling, tubing string, additional adjusting connection pipes by which couplings of one string are placed between couplings of the other string, shoe of the short string is located 20-30 m above roof of upper formation. Pipes with internal corrosion-resisting and antifouling smooth covering are used for tubing strings mounting. Above the level of short string bottom well is filled with anticorrosive liquid.

EFFECT: eliminating twisting of tubing strings relative to each other, loosing of thread and tubes turning, eliminating seal failure.

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Description

The invention relates to the oil industry and can find application for simultaneous-separate injection of a working agent into productive formations.

A known installation for simultaneous-separate injection of water into two layers through one well, including two-channel wellhead fittings, a packer installed between the upper and lower layers, the main column of elevator pipes in communication with the lower layer, and an additional one. An additional column of elevator pipes is placed in the well parallel to the main one and connected to it by a two-channel anchor, and the wellhead reinforcement is double-barreled (RF Patent for Utility Model No. 79616, publ. 10.01.2009).

Closest to the proposed invention in technical essence is a unit for simultaneous and separate injection of water into two layers, including two-channel wellhead fittings, a packer installed between the upper and lower layers, the main pipe string in communication with the lower layer, an additional pipe string located in the well parallel to the main, and two-channel anchor between two columns. The channel of the two-channel anchor for the main column is made in the form of a coupling with internal threads, the channel for the additional column is made smooth so that the additional pipe string is not anchored, the anchor has a beveled upper part and is made of easily drilled material. As couplings on the main pipe string, couplings with an outer diameter reduced by 4 mm were used (RF Patent No. 84458, publ. 07/10/2009 - prototype).

The disadvantages of the known technical solutions are the engagement and twisting of a short column around a long column of pipes, the low strength of a long column, the duration and multi-stage of the tubing string, the joint work of two columns contributes to the phenomenon of lapel tubes and violation of tightness.

The invention solves the problem of eliminating the twisting and twisting of the columns relative to each other, loosening the threads and flap of the pipes, eliminating the violation of tightness.

The problem is solved in that in the installation for simultaneous-separate injection of the working agent, comprising a long column of tubing with a packer and a short column of tubing located in the well, according to the invention, the long column has a bottom-up nozzle with a retaining ring and high-tight couplings or couplings having an outer diameter reduced by 2 mm compared to the standard, an operational packer, a nozzle assembled on high-pressure couplings or couplings with sealant on the threads of columns tubing, an eccentric, while the string is placed in the well with the possibility of tensioning and securing it in tension to the wellhead fittings, the short string of tubing is assembled on couplings with thread sealant, has a sleeve from the bottom up, the tubing string additional fitting pipes, by means of which the couplings of one column are placed between the couplings of the other column, and the shoe of the short column is placed 20-30 m above the roof of the upper layer, in addition, us pipe with internal anticorrosive and antifouling coating smooth and short column above the bottom level of the well is filled with anti-corrosion liquid.

Figure 1 presents the claimed installation.

Installation for simultaneous-separate injection of the working agent includes a long string of tubing 2 located in the well 1, which has a bottom-up nozzle 3 with a retaining ring 4 and couplings 5 that are highly leak-tight with o-rings or having an outer diameter reduced by 2 mm compared to a standard diameter, production packer 6, pipe 7, tubing string 2 assembled on couplings 5, eccentric 8. Column 2 is placed in the well with the possibility of tensioning and fixing in tension to wellhead fittings 9. Parallel to the long string 2, a short string of tubing 10 is placed in the well 1, which is assembled on the couplings 11 with a thread sealant, has a bottom coupling 12 from the bottom up, fitting pipes 13, through which the couplings of one column 5 are placed between the couplings another column 11. The lower sleeve of the short column 12 is placed above the roof of the upper layer by 20-30 m. Above the bottom of the short column 12, well 1 is filled with anti-corrosion fluid 14. Pipes with internal anti-corrosion were used for the installation of the columns smooth and anti-fouling smooth coating (not shown). Well 1 opened perforated layers 15.

There are no restrictions on the use of a type of sealant and internal anti-corrosion and anti-fouling smooth coating.

Installation is collected as follows.

The long column is collected from the bottom up and, as it is assembled, lowered into the well, the packer is set at the required depth. At the end of the descent, the dead weight of the long column is precisely recorded. Compress a long column at a pressure of 15 MPa. Make a packer landing. Compress the packer at the pressure of the injectivity of the reservoirs by pumping the process fluid into a long column with control of the fluid exit from the annulus. A tension of a long column is created, which is 2-3 t more than its own weight. A long column is fixed at the wellhead in an extended state.

A short string is collected and lowered into the well.

During the descent, a “study” is made: a short column is raised and lowered every 4-6 pipes to make sure that it does not twist around a long column. The descent is carried out under constant control of the weight indicator, since a gradual decrease in weight is one of the signs of twisting a short column around a long column. Before the descent, the columns are made with a non-metallic template. Thread sealing is done with sealant. Compress the column at a pressure of 15 MPa. Water-based anti-corrosive fluid is pumped into the annulus.

During well operation, a working agent is pumped over a long column under the packer into the lower reservoir, a short agent is pumped over the packer over the packer into the upper reservoir.

As a result, it is possible to exclude the twisting of the columns, the weakening of the threads, the flap of the pipes and the violation of tightness.

The application of the proposed device will eliminate the twisting of the columns relative to each other, loosening the threads and flap of the pipes, the exclusion of leakage.

Claims (1)

Installation for simultaneous and separate injection of the working agent, including a long column of tubing with a packer and a short column of tubing located in the well, characterized in that the long column has a pipe with a lock ring and highly tight couplings or couplings having reduced by 2 mm compared to the standard outer diameter, production packer, nozzle assembled on highly tight couplings or couplings with sealant on the threaded tubing string rub, eccentric, while the string is placed in the well with the possibility of tensioning and securing it in tension to the wellhead fittings, the short string of tubing is assembled on thread couplings with sealant, has a bottom-up sleeve, tubing string, and additional fitting nozzles by means of which the couplings of one column are placed between the couplings of the other column, and the shoe of the short column is placed 20-30 m above the roof of the upper layer, in addition, pipes with internal ikorrozionnym and antifouling coating smooth and short column above the bottom level of the well is filled with anti-corrosion liquid.

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