RU65964U1 - DEVICE FOR OIL PRODUCTION FROM WATERFUL PRODUCED LAYER - Google Patents

Abstract

The proposal relates to the oil and gas industry, in particular, to deep-pumped production of waterlogged oil. A device for extracting oil from a waterlogged production reservoir consists of a tubing string, upper and lower plunger pumps, a receiving chamber located opposite the production interval. The device is equipped with a phase separator installed in the receiving chamber and made in the form of tubes concentrically mounted in each other, which allow the gas-oil mixture to be divided into liquid phases by density into oil and water and fed to receptions of the upper and lower plunger pumps, respectively. The plunger of the upper pump through the column pump rods connected to the drive, for example, a rocking machine. The housing of the upper plunger pump is rigidly connected to the receiving chamber by a pipe. The lower pump is upside down and its discharge valve is located under the suction valve, while the lower pump plunger is rigidly connected to the shank, rigidly mounted on the lower end of the receiving chamber. A packer is installed on the bottom pump housing to isolate the reservoir from the absorbing reservoir. Bottom of the lower pump housing is equipped with radial holes and rests on the bottom of the well. The proposed device allows to increase the efficiency of downhole separation (separation) of the gas-oil mixture into liquid phases, and also reduces the cost of electricity consumed and makes it possible to select oil from the well by selecting the stroke length of the upper pump plunger at the wellhead depending on the proportion of oil in the reservoir fluid . 1 ill. for 1 liter

Description

The proposal relates to the oil and gas industry, in particular, to deep-pumped production of waterlogged oil.

A device for oil production is known (see RZh Mining, No. 6 of 1993, 6 G 417 P), including two screw pumps with a common shaft, a receiving chamber placed against the production interval, two packers isolating the production interval. One of the screw pumps, designed for water injection, takes liquid from the lower part of the receiving chamber and directs it into the liner under the lower packer to the absorbed formation.

The closest in technical essence is a device for oil production from an irrigated reservoir (patent RU No. 2190094, IPC 7 E 21 B 43/38, C 02 F 1/48 publ. In Bulletin No. 27 dated 09/27/2002), containing a tubing string, two screw pumps with a common shaft, a receiving chamber located opposite the production interval, a packer isolating the reservoir, the device is equipped with magnetizers installed in the receiving chamber, which receives the gas-oil mixture from the reservoir, taking into account the physical -chemical properties This mixture can also be used at screw pump receptions, the common shaft of which is made magnetic, while the magnetizer of screw pumps have different magnetic properties, for which they are made with a stepped inner surface and are installed on the upper pump with the expanded part up and the lower pump with the expanded part down wherein the magnetizers are installed each with the possibility of limited axial movement and fixation relative to the pump intake, and the length of the input magnetizer is chosen not less than the length of the perforated parts of the casing.

Both analog and prototype have, to one degree or another, common flaws:

firstly, it is necessary to pre-select the ratio of the flow of screw pumps, depending on the ratio of the shares of oil and water in the reservoir fluid, which change during operation;

secondly, the low degree of borehole separation of the gas-oil mixture, which does not allow to qualitatively separate the gas-oil mixture into light (oil) and heavy (water) liquid phases, and this does not allow for efficient selection of products;

Thirdly, the high power consumption of screw pumps.

The technical task of the utility model is to increase the efficiency of borehole separation of a gas-oil mixture into liquid phases, as well as reduce the cost of electricity consumed with the possibility of controlled selection of oil from the well.

The stated technical problem is solved by a device for oil production from an irrigated reservoir, containing a tubing string, two pumps, a receiving chamber opposite the production interval, a packer isolating the reservoir.

What is new is that the device is equipped with a phase separator installed in the receiving chamber and made in the form of tubes concentrically mounted in each other, which allow the gas-oil mixture to be separated into liquid phases and fed to the pump receptions, while the pumps are made with plunger, and the plunger of the upper pump has a column the sucker rods are connected to the drive, and the lower pump is turned upside down and its discharge valve is located under the suction valve, while the plunger of the lower pump is rigidly connected to the shaft, rigidly installed and the lower end of the receiving chamber, wherein the housing lower pump set packer isolating reservoir, and the bottom of the lower pump body is provided with radial openings and is rested on the borehole bottom.

The figure schematically shows the design of the proposed device.

A device for extracting oil from a waterlogged reservoir 1 consists of a string of tubing 2, upper 3 and lower 4 plunger pumps, a receiving chamber 5, located opposite the production interval 6.

The device is equipped with a phase separator 7 installed in the receiving chamber 5, and made in the form of tubes 8 and 9 concentrically mounted in each other, which allow to separate the gas-oil mixture into liquid phases by density into oil and water and apply them to the receptions of the upper 3 and lower 4, respectively plunger pumps.

A plunger (not shown in FIG.) Of the upper plunger pump 3 is connected via a pump rod 10 to a drive, for example, a rocking machine (not shown in FIG.). The housing of the upper plunger pump 3 is rigidly connected to the receiving chamber 5 by the pipe 11.

The lower plunger pump 4 is upside down and its discharge valve 12 is located under the suction valve 13, while the plunger 14 of the lower pump 4 is rigidly connected to the shank 15, which is rigidly mounted on the lower end of the receiving chamber 5. The plunger 14 is hermetically inserted into the housing 16 of the lower pump 4.

A packer 17 is installed on the housing 16 of the lower pump 4, isolating the reservoir 1 from the other reservoir 18. As another reservoir 18, either another reservoir may be used to maintain reservoir pressure, or some kind of absorbing horizon that serves as a reservoir for the discharge of water.

Bottom of the housing 16 of the lower plunger pump 4 is provided with radial holes 19 and rests on the bottom 20 of the well 21.

The device operates as follows.

The assembled device is lowered into the well and unloaded with the housing 16 of the inverted lower plunger pump 4 to the bottom 20 of the well 21. Then, the packer 17 is insulated, isolating the reservoir 1 from another reservoir 18.

Next, the device is put into operation, while conventional plunger deep pumps (SHG) of any known design are used as plunger pumps 3 and 4, while the plunger of the upper pump 3 connected to the column of pump rods 10 under the action of the drive performs axial reciprocating movement, and the plunger 14 of the lower pump 4, rigidly connected to the shank 15 of the string of tubing 2 performs axial reciprocating due to the tension-compression of the string of tubing 2, yaschego as a result of the device relative to the body 16 of the inverted bottom of the pump 4, the housing 16 remains stationary in the discharge device for slaughter investigation hole 20 zapakerovki 21 and packer 17 located on its outer surface.

During the operation of the device, the gas-oil mixture from the flooded reservoir 1 enters the inlet chamber 5, by which it goes down and enters the phase separator 7, in which downhole separation of the gas-oil mixture takes place. Under the influence of gravitational forces, the gas-oil mixture is divided into liquid phases and gas. Gas through the production interval 6 and further along the annulus between the tubing string 2 and the well 21 rises to the surface. Separating liquid phases, they rise up the annular space of pipes 8 and 9, with the heavier liquid phase (water) settling down and the lighter (oil) rising upward.

Thus, the oil rises through the interior of the pipe 11 upward and enters the intake of the upper pump 3, and the water flows through the internal spaces of the pipe 9 and the liner 15 and, filling the plunger 14, enters the intake of the inverted lower plunger pump 4.

The operation of the device continues, with the upper plunger pump 3 pumping oil from the well 21, which rises up the tubing string

pipes 2 to the surface, and the inverted lower plunger pump 4 pumps water from the intake of the inverted lower plunger pump 4 into another reservoir 18. Moreover, during the course of the plunger 14 moving upward relative to the housing 16 of the inverted lower pump 4, the suction valve 13 is open and the discharge valve 12 As a result, water from the intake of the inverted lower pump 4 falls under the suction valve 13, that is, a suction cycle occurs. When the plunger 14 moves downward relative to the housing 16 of the inverted lower pump 4, the suction valve 13 is closed and the discharge valve 12 is open. As a result, water from under the suction valve 13 falls under the discharge valve 12 and through the radial holes 19 of the housing 16 enters another reservoir 18, which absorbs pumped water.

In the future, the cycle of the device is repeated.

Depending on the proportion of oil entering the intake of the upper plunger pump 3 with a drive installed at the wellhead, the stroke length of the plunger of the upper plunger pump 3 is adjusted.

The proposed device allows to increase the efficiency of downhole separation (separation) of the gas-oil mixture into liquid phases, and also reduces the cost of electricity consumed and makes it possible to select oil from the well by selecting the stroke length of the upper pump plunger at the wellhead depending on the proportion of oil in the reservoir fluid .

Claims (1)

A device for extracting oil from a waterlogged reservoir, containing a tubing string, two pumps, a receiving chamber opposite the production interval, a packer isolating the reservoir, characterized in that it is equipped with a phase separator installed in the receiving chamber and made in the form pipes concentrically installed in each other, which allow to separate the gas-oil mixture into liquid phases and feed them to the pump receptions, while the pumps are plunger-shaped, with the upper pump plunger and the string of pump rods is connected to the drive, and the lower pump is turned upside down and its discharge valve is located under the suction valve, while the lower pump plunger is rigidly connected to the shank rigidly mounted on the lower end of the intake chamber, and a packer isolating the reservoir is installed on the lower pump housing and the bottom of the lower pump housing is equipped with radial holes and rests on the bottom of the well.