RU59710U1 - 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 receiving chamber is equipped with through holes, and inside it is equipped with a blank partition, under which the receiving chamber is equipped with a check valve. The plunger of the upper pump by means of a string of pump rods is connected to the drive, for example, by a rocking machine. The bottom pump is upside down and its discharge valve is located under the suction valve. The bottom pump plunger is rigidly connected to 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 borehole 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 productive interval, a packer isolating the reservoir, the device is equipped with magnetizers installed in the receiving chamber, where the gas-oil mixture from the reservoir is received, taking into account the physical -chemical properties The properties of this mixture and at the receptions of screw pumps, the common shaft of which is made magnetic, while the magnetizers 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 extended part up, and on the lower pump - with the extended part down moreover, the magnetizers are each installed 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 inlet chamber is provided with a blank partition under which the inlet chamber is equipped with a check valve, while the pumps are plunger-shaped, with the upper pump plunger connected to the actuator using the pump rod string and the lower pump turned upside down and its discharge valve is under the suction a valve, while the lower pump plunger is rigidly connected to the receiving chamber, and a packer isolating the reservoir is installed on the lower pump housing, and a radial is provided from the bottom of the lower pump housing bubbled holes and rested on the bottom of the well.

The figure schematically shows the design of the proposed device.

A device for extracting oil from a flooded 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 receiving chamber 5 is equipped with through holes 7, and inside is provided with a blind partition 8, under which the receiving chamber 5 is equipped with a check valve 9.

The plunger (not shown in FIG.) Of the upper pump 3 is connected to the drive using, for example, a rocking machine (not shown) with the aid of a string of pump rods 10.

The lower plunger pump 4 is upside down and its discharge valve 11 is located under the suction valve 12.

The plunger 13 of the lower pump 4 is rigidly connected to the receiving chamber 5 and hermetically inserted into the housing 14 of the lower pump.

A packer 15 is installed on the casing 14 of the lower pump 4, isolating the reservoir 1 from another reservoir 16. As another reservoir 16, either another reservoir to maintain reservoir pressure or some kind of an absorbing horizon that serves as a reservoir for discharged water can be used.

Bottom of the housing 15 of the lower plunger pump 4 is provided with radial holes 17 and rests on the bottom 18 of the well 19.

The device operates as follows.

The assembled device is lowered into the well and unloaded by the casing 14 of the inverted lower pump 4 to the bottom 18 of the well 19. After that, the packer 15 is insulated, isolating the producing formation 1 from another formation 16.

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.

The plunger 13 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, resulting from the operation of the device relative to the housing 14 of the inverted lower plunger pump 4, since the housing 14 remains stationary due to the unloading of the device to the bottom 18 of the well 19 and the packing of the packer 15 located on its outer surface.

During the operation of the device, the gas-oil mixture from the flooded reservoir 1 enters the well 19 opposite the production interval 6, where, under the influence of gravity, the gas-oil mixture is separated into liquid phases and gas. Gas from the productive interval 6 along the annulus between the tubing string 2 and the well 19 rises to the surface. The liquid phases are separated, with the heavier liquid phase (water) settling down, and the lighter (oil) rising up.

Oil through the through holes 7 enters the upper part of the intake chamber 5 and enters the intake of the upper pump 3, and water through the check valve 9 enters the lower part of the intake chamber 5, where it goes down and fills the plunger 13 and receives the inverted lower plunger pump 4. Moreover, the mixing of the liquid phases inside the receiving chamber is prevented by a blank partition 8. In addition, water that has fallen with the oil into the upper part of the receiving chamber 5 due to gravitational forces settles above the blank partition 8 and does not fall on Receiving upper plunger pump 3.

The operation of the device continues, with the upper plunger pump 3 pumping oil from the well 19, which rises up the tubing string 2 to the surface, and the inverted lower plunger pump 4 pumping water from the bottom of the receiving chamber 5 to another reservoir 16. Moreover, during the stroke of the plunger 13 upward relative to the housing 14 of the inverted lower

pump 4, the suction valve 12 is open, and the discharge valve 11 is closed. As a result, water from the intake of the inverted lower pump 4 falls under the suction valve 12, that is, a suction cycle occurs. When the plunger 13 moves downward relative to the housing 14 of the inverted lower pump 4, the suction valve 12 is closed and the discharge valve 11 is open. As a result, water from under the suction valve 12 falls under the discharge valve 11 and through the radial holes 17 of the housing 14 it enters another reservoir 16, which absorbs the pumped water.

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

Depending on the proportion of oil supplied to 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 water-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 producing reservoir, characterized in that the receiving chamber is provided with a blank partition under which the receiving chamber is provided with a return a valve, while the pumps are made plunger, and the plunger of the upper pump is connected to the actuator using a string of pump rods, and the lower pump is turned upside down and its discharge valve is located It flows under the suction valve, while the lower pump plunger is rigidly connected to the receiving chamber, and a packer is installed on the lower pump casing, isolating the reservoir, and the lower pump casing is equipped with radial holes and is rested against the bottom of the well.