RU57814U1 - 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 lower pump plunger is rigidly connected to the receiving chamber and hermetically inserted into the lower pump housing.

Using a shear element, a packer made by a drillable and isolating from below the productive formation is hermetically mounted on the bottom pump housing.

The proposed device allows to increase the efficiency of downhole separation (separation) of the gas-oil mixture into liquid phases, as well as reduce 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 of 09/27/2002), containing a tubing string, two screw pumps with a common shaft, a receiving chamber 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, screw shaft on the wasp is made magnetic, while the magnetizers of the 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 on the lower pump, with the expanded part down, each magnetizer installed with limited axial movement and fixing relative to the intake of the pump, the length of the input magnetizer selected at least the length of the perforated part 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 located opposite the production interval, a packer, and a 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, the plunger of the upper pump being connected to the actuator using a string of pump rods, the lower pump is turned upside down and its discharge valve is located under the suction valve, the plunger of the lower pump is rigidly connected to the receiving chamber, and on the case of the lower pump using a shear element hermetically fixed packer made drilled, and insulating bottom formation.

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 4.

On the housing 14 of the lower pump 4 using a shear element 15 hermetically fixed packer 16, made drilled, and isolating the bottom of the reservoir 1.

The device operates as follows.

First, the housing 14 of the lower pump 4 is lowered into the well 17, on the outer surface of which a drill packer 7 is sealed by means of a shear element 15, and the latter is installed below the reservoir 1, i.e. between

insulated reservoir 1 and reservoir 18 (for example, absorbing), located below the reservoir 1. Then make the landing and packing drilled packer 16 in the well 17.

Next, the remaining part of the device is lowered into the well assembly 17 until the plunger 13 of the lower pump 4 seals tightly into the housing 14 of the lower pump 4 and abuts against the upper end of the housing 14.

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 string of pump rods 10, undergoes an axial reciprocating movement under the action of the drive.

The plunger 13 of the lower pump 4, rigidly connected by the tubing string 2 through the receiving chamber 5 and the upper pump housing 3, performs axial reciprocation due to the tension-compression of the tubing string 2, resulting from the operation of the device relative to the housing 14 the inverted lower plunger pump 4, since the housing 14 remains stationary due to the shear element 15, which fixes it relative to the drilled packer 16, which is packed in the well 17.

During the operation of the device, the gas-oil mixture from the flooded reservoir 1 enters the well 17 opposite the production interval 6, where, under the influence of gravity, the gas-oil mixture is divided into liquid phases and gas. Gas from the production interval 6 along the annulus between the tubing string 2 and the well 17 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 receiving chamber 5 and enters the intake of the upper pump 3, and water through the check valve 9 enters the lower part of the receiving chamber 5, where it goes down, and filling the plunger 13, it receives the inverted lower plunger pump 4. Moreover, the mixing of the liquid phases inside the receiving chamber 5 is prevented by a blank partition 8. In addition, water that has fallen together with the oil in the upper part of the receiving chamber 5, due to gravitational forces, settles over the blind partition 8 and does not get into and the intake of the upper plunger pump 3.

The operation of the device continues, while the upper plunger pump 3 pumps oil from the well 17, which rises up the tubing string

pipes 2 to the surface, and the inverted lower plunger pump 4 pumps water from the bottom of the receiving chamber 5 into the reservoir 18.

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 enters the reservoir 18, 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.

If necessary, the device can be removed from the well 17 by pulling the tubing string 2 upward, thereby collapsing the shear element 15, the fixing body 14 of the lower pump 4 relative to the drill packer 16. As a result, the housing 14 of the lower pump 4 comes out of the drill packer 16 and the pump string -compressor pipes are completely removed from the well 17, the drillable packer 16 is subsequently drilled.

The proposed device allows to increase the efficiency of downhole separation (separation) of the gas-oil mixture into liquid phases, as well as reduce 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 oil extraction from a waterlogged reservoir, containing a tubing string, two pumps, a receiving chamber opposite the production interval, a packer, and a producing reservoir, characterized in that the receiving chamber is provided with a blank partition under which the receiving chamber is equipped with a check valve wherein the pumps are plunger-shaped, the plunger of the upper pump being connected to the actuator using a string of pump rods, while the lower pump is turned upside down and its discharge valve is under the suction valve, while the lower pump plunger is rigidly connected to the receiving chamber, and on the lower pump housing, using a shear element, the packer is made hermetically drilled and insulates the productive layer from below.