RU2724712C1 - Installation for simultaneous separate extraction and injection - Google Patents

Abstract

FIELD: oil and gas industry.SUBSTANCE: invention relates to oil and gas industry and is intended for use on well with simultaneous separate operation, where water is pumped to lower formation to maintain formation pressure, and production is performed on upper formation. Installation for simultaneous separate extraction and pumping through one well comprises drive connected to screw pump shaft, two tubing strings of different length, one of which is a positive, and second is producing with screw pump, parallel two-channel armature, wellhead fittings and packer for separation of formations. Drive used is impeller-type hydraulic drive installed in tubing string injection tubing with possibility of transfer of rotation from its output shaft to shaft of screw pump of inverted type through motor-reducer with parallel shafts, installed above parallel two-channel anchor with possibility of liquid passage through tubing string.EFFECT: technical result consists in simplification of installation, expansion of technological capabilities due to use of water energy to maintain formation pressure as energy for lifting production of oil-bearing reservoir, low power consumption.1 cl, 2 dwg

Description

The invention relates to the oil and gas industry and is intended for use in wells with simultaneous and separate production, where water is injected into the lower reservoir to maintain reservoir pressure, and production is performed in the upper reservoir.

A known installation for simultaneous and separate production and injection (patent RU No. 2598948, IPC ЕВВ 43/14, publ. 10/10/2016), containing two columns of coaxially installed tubing of different diameters, a pump, a device for separating the flows of injected and withdrawn fluid , valve on the line of injected fluid, packer for separation of productive and injection formations and wellhead fittings. An electric centrifugal pump was used as a pump. A device for separating the flows of injected and withdrawn liquid is placed above the pump. Between the pump and the packer, a displacement unit is installed, in which load-carrying pipes are mounted for passing the injected fluid, docked in the upper part with a fork located at the level of the device for separating the flows of injected and withdrawn fluid. The valve on the line of the injected injection fluid is located below the packer, which is part of the packer arrangement, including column disconnectors, flushing and anti-flying devices. The well-known installation improves the reliability and safety of operation of the installation, simplifies its dismantling and provides the possibility of oil production in large volumes.

The disadvantages of this installation are the technological complexity of the process of launching an electric centrifugal pump with a cable and the installation of the wellhead equipment of the control station, as well as the high consumption of electric energy for mechanized lifting of well products.

The closest is the installation for simultaneous and separate production and injection (patent RU No. 84461, IPC ЕВВ 43/14, publ. 10/10/2016), containing a drive, a pump, two columns of tubing of various lengths, a parallel two-channel anchor , wellhead and packer for separation of formations. As a drive for rotating the string of pump rods, a ground drive of a screw rod pump was used, while a screw rod pump was used as a pump.

The disadvantages of this installation are the technological complexity of the process of launching a screw pump and the installation of a ground drive of a screw rod pump, as well as the high consumption of electric energy for mechanized lifting of well production.

The technical objectives of the invention are to simplify the installation, expanding technological capabilities through the use of water energy to maintain reservoir pressure as energy for raising the production of an oil reservoir, reducing energy consumption.

Technical problems are solved by a unit for simultaneous and separate production and injection through one well, containing a drive connected to the shaft of the screw pump, two tubing strings of various lengths, one of which is injection and the other is production with screw pump, parallel two-channel anchor , wellhead and packer for separation of formations.

What is new is that an impeller type hydraulic actuator is used as the drive, installed in the discharge string of tubing with the possibility of transmitting rotation from its output shaft to the shaft of an inverted screw pump through a gear motor with parallel shafts, mounted above a parallel two-channel armature with the possibility of transmission fluid over tubing columns.

In FIG. 1 schematically shows an installation for simultaneous-separate production and injection through one well.

In FIG. 2 schematically shows the impeller type hydraulic actuator.

When operating a well that has opened a reservoir with several layers, each layer is operated individually. From the upper oil-saturated formation (Fig. 1), liquid is taken continuously. A working agent, for example, produced water, is pumped into the lower layer. The well is equipped with two columns of pipes of various lengths. A hydraulic drive of impeller type 2 is installed in the first injection column 1 of the tubing with the possibility of transmitting rotation from its output shaft 3 (Fig. 2) to the shaft of an inverted screw pump 4 through a gear motor 5 with parallel shafts, which is placed over the parallel two-channel armature 6 with the possibility of transmission fluid on tubing strings. All connections are threaded pipe cylindrical. The packer 7 is lowered on the injection string 1 of the tubing. A parallel anchor 6 is installed above the roof of the producing formation (used in the layout of the WEM). Install the packer 7 between the upper and lower layers, closer to the lower layer. The second production tubing string 8 is equipped with an inverted-type screw pump 4, which is placed above a parallel two-channel armature 6. The pump is selected with a capacity sufficient for liquid withdrawal. At the wellhead, piping of the pipes is carried out with two-channel wellhead fittings 9, with the possibility of connecting the first injection 1 tubing string with a source of working agent for pumping the working agent into the lower layer. The working agent is pumped into the lower layer through the first injection 1 tubing string. Due to the flow of the working agent passing through the injection pipe 1 through the hydraulic drive of impeller type 2, the impellers 10 (Fig. 2) rotate with the hydraulic drive shaft 11 (Fig. 2). Next, the shaft 11 of the hydraulic actuator using the leading screw 3 (Fig. 2) transmits rotational force to a cylindrical gear motor 5 with parallel shafts. The gear motor 5 drives the shaft of an inverted screw pump 4, which leads to a rise in well production along the second production string 8 of the tubing string to the day surface further through the wellhead two-channel valve 9 into the oil pipeline.

Installation for simultaneous-separate production and injection works as follows.

When operating a well with an inner diameter of the production string of more than 120 mm, which has opened a reservoir with several layers, each layer is operated individually. From the upper oil-saturated formation, liquid is taken continuously. A working agent, such as produced water, is pumped into the lower layer. The well is equipped with two pipe columns.

Lower the first injection 1 (Fig. 1) tubing string with a packer on the tubing in the following arrangement, from bottom to top:

- a funnel with a diameter of 60 mm;

- mounting pipe of tubing with a diameter of 60 mm, length 1 m;

- sub of tubing 60 mm to 73 mm;

- packer 7 - sub tubing 60 mm to 73 mm;

- tubing mounting pipe with a diameter of 60 mm and a length of 0.5 m;

- tubing with a diameter of 60 mm, length 10 m (liner);

- reference pipes 2 m and tubing 60 mm in diameter with a length of 20 m (to determine the depth of the packer);

- parallel anchor 6;

- a hydraulic drive of impeller type 2 with a parallel gearbox 5, which ensures the passage of fluid through the columns of tubing;

- tubing mounting pipe with a diameter of 60 mm and a length of 0.5 m;

- tubing string 1 with a diameter of 60 mm (to the mouth);

- fitting tubing pipes with a diameter of 60 mm and a hanging tubing pipe with a diameter of 60 mm (a 0.2 m length pipe is used as a hanging pipe). Packer 7 is planted in the interval above the roof of the lower layer.

Run the second producing 8 tubing string in the following sequence:

- coupling device (providing the connection of the shaft of an inverted screw pump 4 with a parallel hydraulic drive gearbox);

- screw pump 4 of an inverted type with a rotor; at the end of the rotor there is a connecting screw);

- coupling with a diameter of 60 mm;

- tubing mounting pipe with a diameter of 60 mm and a length of 0.5 m;

- tubing 8 with a diameter of 60 mm (to the mouth). The own weight of the second tubing string is determined, the weight of the second tubing string with a screw pump is unloaded to 1-2 tons (20% of the weight of the tubing string), then the tubing string 8 is rotated to couple the cardan with a parallel armature 6 and a hydraulic drive gear. Hitch parallel armature 6 with a short column 8.

The pump is selected with a capacity sufficient for fluid withdrawal. Due to the presence of eccentric guides, the screw pump 4 is docked with a parallel armature 6 and at the same time the shaft of the screw pump 4 is joined to the gearbox 5.

At the wellhead, piping of the pipes with two-channel wellhead fittings 9 is performed, with the possibility of connecting the first injection 1 tubing string to the source of the working agent for pumping the working agent into the lower layer. The flow of the working agent passing through the injection pipe 1 through the hydraulic drive of impeller type 2 drives the impeller 10 (Fig. 2) with the shaft 11 (Fig. 2) of the hydraulic actuator. Next, the hydraulic drive shaft 11 with the help of a leading screw 3 transfers rotational force to a cylindrical gear motor 5 with parallel shafts. The gear motor 5 drives the shaft of an inverted screw pump 4, which leads to a rise in well production along the second tubing string 8 to the surface and then through the wellhead two-channel valve 9 into the oil pipeline.

An installation for simultaneous and separate production and injection in one well allows simplifying the design of the installation, expanding the technological capabilities of the installation by using the energy of water to maintain reservoir pressure as energy for raising the production of an oil reservoir.

Claims (1)

Installation for simultaneous and separate production and injection, containing a drive connected to the shaft of a screw pump, two tubing strings of various lengths, one of which is injection, and the second is production with a screw pump, parallel two-channel armature, wellhead fittings and a packer for separation of the layers, characterized in that the drive used is an impeller-type hydraulic actuator installed in the discharge string of tubing with the possibility of transmitting rotation from its output shaft to the inverted-type screw pump shaft through a gear motor with parallel shafts, mounted above a parallel two-channel anchor with the ability to pass fluid through the columns of tubing.

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