RU184474U1 - INSTALLATION FOR PUMPING SEPARATED GAS FROM OIL WELL - Google Patents

Abstract

The utility model relates to the oil industry and can be used in production wells to reduce the pressure of separated associated gas in the annulus and increase the flow of oil from the reservoir. The technical task of the proposed device is to ensure the reliability of its operation in conditions of removal of mechanical impurities from the reservoir. separated gas from an oil well, including a cylinder with two pistons connected to a rod passing through an oil seal, on both sides of which lines for fluid inlet and outlet are connected to the cylinder through the flow switch, two pairs of suction and discharge check valves connected to the cylinder cavities on the outside of the pistons, the suction valves of which are connected to the annulus of the well, and the discharge valves to the discharge manifold of the well, according to a utility model , between the two sections of the divided cylinder there is an additional cylinder of a smaller diameter with a piston connected to the pistons of the sections of the divided cylinder by rods passing through ca bows, and the supply lines from the flow switch to a cylinder of smaller diameter on both sides of its piston are connected to the surface pump by high and low pressure lines, the cavities of the sections of the divided cylinder from the glands are connected to each other, as well as to the supply tank through a check valve, and the line is high the pressure of the surface pump through the safety valve is connected to the supply tank, and the low pressure line is also connected to the supply tank through the check valve. 1 of FIG.

Description

The utility model relates to the oil industry and can be used in production wells to reduce the pressure of separated associated gas in the annulus and increase the flow of oil from the reservoir.

The accumulation of gas separated at the reception of deep pumps in the annulus leads to a decrease in the dynamic level of the liquid, a decrease in the flow of oil and a disruption to the operation of the pumps due to the ingress of gas into them. In order to prevent failure of the pumps, the annular space of the well is communicated with a discharge manifold at the wellhead through a check valve.

A device is known (RF Patent No. 2309240 C1. Wellhead equipment for oil production pumps. Claim. 03/09/2006. Publish. 10/27/2007). It includes a faceplate mounted on the flange of the production casing with an eccentric sleeve for connecting the tee and the injection line of the well. In the flange part of the faceplate, vertical and horizontal channels are made for installing a bypass device. The increase in pressure in the annulus leads to the opening of the spring-loaded bypass valve and the passage of gas from the annulus into the pressure line of the well.

A wellhead check valve is also known (RF Patent No. 2367775 C1. A check wellhead valve for an oil, oil and gas well. Declared June 18, 2008. Publish. September 20, 2009.), including a hollow body equipped with inlet pipes for oil and gas, as well as the discharge of the mixture at the wellhead. When the gas pressure exceeds the pressure of the fluid flow by 0.02 ... 0.05 MPa, the spring loaded valve disc breaks off the seat and passes gas from the annulus into the fluid flow in the “soft” mixing mode to create optimal thermal conditions in the valve placement area. With a decrease in gas pressure, the plate again closes the valve seat.

However, the use of both of the above analogues is ineffective at elevated fluid pressures in the discharge manifold. The gas pressure cannot overcome this pressure and the dynamic level of the liquid decreases before the pump is received and the gas disrupts its operation.

It is known that the selection of gas or carbonated liquid from the annulus into the tubing string can be done using an ejector installed inside the string. The liquid pumped out using an electric centrifugal pump enters the nozzle of the ejector and ejects the gas-oil mixture from the annulus into the tubing, thereby reducing the gas pressure in the annulus (RF Patent No. 1825544. Device for lifting carbonated liquid from a well. Announced. 06/29/1988. Publ. October 12, 1992).

The device has a significant drawback consisting in significant hydraulic resistance to fluid movement in the working nozzle of the ejector. They lead to a decrease in head and submersible pump flow.

A well-known installation of a borehole sucker-rod pump, which allows for forced pumping of gas from the annulus into the tubing string and into the flow collector of the well using an additional pump installed in the upper part of the tubing string and consisting of a cylinder with a flowing plunger located in the tubing string, is reverse valves located on both sides of the cylinder for periodic suction of gas into the cylinder from the annulus of the well and subsequent injection of gas into the pump compressor pipes and in the flow well collector (Patent RU No. 122453 for a utility model: “Installation of a borehole sucker rod pump.” Declared April 24, 2012 Published. November 27, 2012). In addition, an additional pair of check valves is installed in the plunger of the auxiliary pump and at the wellhead, which, together with the above valves, allows gas to be taken from the annulus for each stroke of the pump plunger. Thus, a portion of gas is taken cyclically from the annulus both during the upward and during the downward stroke of the gas and is pumped into the flow collector by an additional pump. Due to this, the gas pressure in the annulus decreases.

The disadvantage of this installation is the impossibility of its use in other methods of mechanized oil production, for example, submersible centrifugal or screw pump units.

Closest to the proposed solution is a device for the removal of gas from the annulus of an oil well (patent RU No. 2567571 C1. Claim. 06/27/2014. Publ. 10.11.2015. Bull. 31). The device consists of a cylinder with two pistons connected by a rod passing through a central oil seal in the cylinder. An explosive valve is installed in the flow collector of the well, on both sides of which an input and output valves are connected to the collector, connecting the collector through the flow switch 10. A suction and pressure gas lines are connected to both ends of the cylinder through check valves.

The operation of the device consists in alternately supplying well production to the cylinder to the left or right of the stuffing box, which under pressure moves the pistons in one direction or another. When the cylinder volumes are released from the outer sides of the pistons, gas enters them from the annulus of the well. When changing the direction of movement of the pistons from these cavities, the previously received gas is displaced into the collector.

The device has the disadvantage of entering into the cylinder together with the liquid mechanical impurities (silica sand and other minerals) carried out from the reservoir. Accumulating in the cylinder cavities, these impurities disrupt the normal operation of the device, preventing the pistons from switching.

The technical task of the proposed device is to ensure the reliability of its work in conditions of removal from the reservoir of mechanical impurities.

The problem is solved in that in the known device comprising a cylinder with two pistons connected to a rod passing through an oil seal, on both sides of which lines for entering and leaving liquid are connected to the cylinder through a flow switch, two pairs of suction and discharge check valves connected with cylinder cavities on the outer sides of the pistons, the suction valves of which are connected to the annulus of the well, and the injection ones to the discharge manifold of the well, according to the utility model, between two sections The split cylinder contains an additional cylinder of a smaller diameter with a piston connected to the pistons of the sections of the divided cylinder by rods passing through the seals, and the supply lines from the flow switch to the cylinder of a smaller diameter on both sides of its piston are connected to the surface pump by high and low pressure lines, section cavities the divided cylinder from the side of the glands are connected to each other, as well as to the supply tank through the check valve, and the high-pressure line of the surface pump through edohranitelny valve connected to the feed tank and the low pressure line is also connected to a feed tank through a check valve,

In FIG. a diagram of the implementation of the proposed device.

The device consists of sections 1 and 2 of the cylinder with pistons 3 and 4. Between sections 1 and 2 there is an additional cylinder 5 of smaller diameter with a piston 6 connected to the pistons 3 and 4 by rods 7 and 8 passing through the seals 9 and 10. Sections 1 and 2 through suction valves 11 and 12 are connected by line 13 to the annulus 14 of the well, and through pressure valves 15 and 16 by line 17 are connected to the pressure header 18 of the well.

In the cavity of the cylinder 5, on both sides of the piston 6, lines 19 20 from the flow switch 21 are connected. At the same time, high pressure lines 22 from the surface pump 23 and low pressure 24 of the intake pump 23 are suitable for the flow switch 21. High pressure line 22 is connected to line 25, which through the safety valve 26 enters the supply tank 27 with the working fluid. Both cavities of sections 1 and 2 between the pistons 3 and 4 and the seals 9 and 10 through the line 28 and the valve 29 are also connected to the cavity of the supply tank 27. The low pressure line 24 through the valve 30 is connected to the cavity of the supply tank 27. On the high pressure line 22 of the pump 23 mounted pressure gauge 31.

The operation of the installation is as follows.

In FIG. shows the position of the flow switch 21, in which the working fluid pumped by the pump 23 enters the additional cylinder 5 on the left side of the piston 6. The pressure of the working fluid causes the piston 6, and therefore the pistons 3 and 4 to move to the right. During this period, the volume of section 1 is released on the left side of the piston 3 and into it, through line 13 through the check valve 11, gas will flow from the annulus of the well 14 under pressure, reducing the pressure in the annulus.

At the same time, through the non-return valve 16 on the right side of the piston 4, gas will be pumped into the manifold 18 from the annular space 14 of the well in the previous cycle of the position of the flow switch 21.

In the same period, the working fluid will be forced out of the cavity of section 1 between the piston 3 and the stuffing box 9 into the cavity of section 2 between the piston 4 and the stuffing box 10.

After the pistons 3 and 4 have reached the extreme right position, the contact of the electromagnet (in Fig. Not shown) of the flow switch 21 is activated and it is switched to supply fluid to the cylinder 5 to the right of the piston 6.

The increased pressure of the fluid in the cavity of the cylinder 5 to the right of the piston 6 will cause the entire piston group to move to the left. During this period, gas from section 1 through the check valve 15 will be pumped into the manifold 18 along line 17. Simultaneously, gas from the annulus 14 of the well will enter the released cavity of section 2 to the right of the piston 4 through valve 12 through line 13. In this cycle, the working fluid from the cavity of section 2 to the left of the piston 4 will be forced out from the cavity of section 1 to the right of the piston 3. When the piston group reaches the extreme left position, the flow switch 21 changes the discharge lines 19 and 20. Then the cycles are repeated. In the case of injection of the working fluid along lines 22 and 19, the flow switch 21 connects the line 20 to the low pressure line 24 at the intake of the pump 23. In the next cycle, the injection of the working fluid by the pump 23 is carried out along the lines 22 and 20, and the flow of the working fluid to the intake of the pump 23 is made along lines 20 and 24.

In order to avoid rupture of valves, tanks and pipelines with a possible short-term increase in pressure in the pressure line 22 of the pump 23 above the permissible value on the line 25, the safety valve 26 activates, dropping a small portion of the working fluid through itself into the supply tank 27.

In the operation of the installation, leakages of the working fluid in the hydraulic system of the pump 23 are possible. This will lead to a deficit in the flow of the working fluid to the pump intake, i.e. incomplete filling of sections 1 and 2. In this case, the pressure at the intake of the pump 23 will decrease to a value below atmospheric. Therefore, to receive the pump 23 will additionally receive the required amount of working fluid from the supply tank 27 through the check valve 30. Thus, the pumping of the working fluid by the pump 23 occurs in a closed system without contact with the gas phase, which prevents the ingress of mechanical impurities to the reception of the pump 23. If there is a shortage of the working fluid in line 28, also formed due to leaks, and a decrease in pressure, the working fluid will flow into it from the supply tank 27 through the valve 29.

To ensure the normal operation of the pump installation, the pressure generated by the pump 23 must exceed the fluid pressure in the discharge manifold 18. The productivity of the pump 23 is selected based on the required volumes of gas pumped from the annulus of the well.

The choice of the diameter of the additional cylinder 5 smaller in comparison with the diameter of the sections 1 and 2 is determined by the large volumes of gas pumped in comparison with the volume of the working fluid supply by the pump 23. Compensation of the smaller supply of the working fluid is made by increasing the pressure of the working fluid for pump 23.

The technical and economic advantage of the pump installation is to ensure high reliability of the pump due to the absence of mechanical impurities in the pumped working fluid,

Claims (1)

Installation for pumping separated gas from an oil well, including a cylinder with two pistons connected to a rod passing through an oil seal, on both sides of which lines for entering and leaving liquid are connected to the cylinder through a flow switch, two pairs of suction and discharge check valves connected to cylinder cavities on the outer sides of the pistons, the suction valves of which are provided with the possibility of connection with the annulus of the well, and the injection ones with the discharge manifold of the well, characterized the fact that between the two sections of the divided cylinder there is an additional cylinder of a smaller diameter with a piston connected to the pistons of the sections of the divided cylinder by rods passing through the seals, and the supply lines from the flow switch to the cylinder of a smaller diameter on both sides of its piston are connected to the surface pump by high and of low pressure, the cavities of the sections of the divided cylinder on the side of the seals are interconnected, as well as with the supply tank through the check valve, and the high pressure line hnostnogo pump through the pressure relief valve is connected to the feed tank and the low pressure line is also connected to a feed tank through a check valve.

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