High-pressure water distribution mother liquid metering and mixing valve group

Abstract

A high-pressure water distribution mother liquid metering and mixing valve group relates to the technical field of oil field polymer injection and oil extraction. A flowmeter and an electric control valve are arranged on the water injection pipe, a one-way valve is arranged on the mother liquor injection pipe, an inlet and an outlet of the one-way valve are on the same axis, the water injection pipe is connected to the mother liquor injection pipe beside a pipeline at the rear end of the one-way valve, a pipeline formed by combining the water injection pipe and the mother liquor injection pipe enters the static mixer, and an outlet of the static mixer is connected with the mixed injection pipe. The utility model has the beneficial effects that when the mother liquor pressure is higher than the water injection pressure, the one-way valve is in an open state, the mother liquor does not need to consume pressure for opening the valve head, the flow rate and direction of the mother liquor flowing through the one-way valve are not changed, and meanwhile, the whole mother liquor injection pipe is always positioned on a straight pipeline, so that the degradation rate of the mother liquor is reduced; water flowing in the tangential direction is premixed with the mother liquor, so that the mother liquor is prevented from being degraded with a baffle plate in the static mixer when directly entering the static mixer.

Description

Technical Field

[0001] This utility model relates to the field of oilfield polymer injection technology, and in particular to a high-pressure water distribution mother liquor metering and mixing valve group. Background Technology

[0002] In tertiary oil recovery in oilfields, polymers are injected to improve oil recovery rates. During injection, the prepared polymer mother liquor is connected to the water injection pipeline through a high-pressure pipeline. The polymer mother liquor and water are injected into the formation in a certain proportion. The existing high-pressure water distribution mother liquor metering and mixing valve group has a complex structure. During the transportation and mixing process, the polymer mother liquor needs to pass through check valves, water injection pipes, elbows, etc., which changes the flow rate and direction of the polymer mother liquor multiple times, resulting in a high shear degradation rate of the polymer mother liquor and affecting the oil displacement effect. Utility Model Content

[0003] To address the problem of high polymer mother liquor degradation rate in current high-pressure water distribution mother liquor metering and mixing valve groups, this utility model provides a high-pressure water distribution mother liquor metering and mixing valve group.

[0004] The technical solution provided by this utility model is: a high-pressure water distribution mother liquor metering and mixing valve group, including a water injection pipe, a mother liquor injection pipe and a mixing injection pipe. The water injection pipe, the mother liquor injection pipe and the mixing injection pipe are respectively equipped with shut-off valves. The water injection pipe is equipped with a flow meter and an electric regulating valve. The mother liquor injection pipe is equipped with a check valve. The inlet and outlet of the check valve are on the same axis. The water injection pipe is connected to the mother liquor injection pipe at the rear end of the check valve. The pipe after the water injection pipe and the mother liquor injection pipe are merged enters a static mixer. The outlet of the static mixer is connected to the mixing injection pipe.

[0005] The one-way valve includes an inlet pipe section and an outlet pipe section. The inlet pipe section includes an inlet, the inner diameter of which is the same as the inner diameter of the mother liquor injection pipe. The inlet pipe section has an enlarged conical hole on the left side of the inlet. The outlet pipe section includes an outlet, the inner diameter of which is the same as the inner diameter of the mother liquor injection pipe. The outlet pipe section has an enlarged valve chamber pipe on the right side of the outlet.

[0006] The inlet pipe section and the outlet pipe section are connected by bolts for sealing. A valve head is installed inside the valve chamber pipe. A conical head is provided on the right side of the valve head. The conical head and the conical hole are sealed together. A guide post is provided on the left side of the valve head. The guide post and the positioning sleeve are connected with clearance fit. The positioning sleeve is fixed inside the valve chamber pipe by the support arm.

[0007] A switching assembly is provided between the valve chamber tube and the valve head. The switching assembly includes an upper sleeve and a lower sleeve. The upper sleeve is hinged to the inner wall of the valve chamber tube, and the lower sleeve is hinged to the outer circle of the valve head. A compression spring is provided between the upper sleeve and the lower sleeve.

[0008] The guide column is connected to the baffle plate on the left side by bolts. The outer diameter of the baffle plate is the same as that of the valve head. The baffle plate is welded to the bolts.

[0009] Instead of connecting the water injection pipe to the mother liquor injection pipe at the rear end of the check valve, the mother liquor injection pipe at the rear end of the check valve is connected to the premixer. The premixer includes a mother liquor inlet, a mixing outlet, and a water inlet. The mother liquor inlet and the mixing outlet are located on the same axis, and the water inlet enters the premixer tangentially.

[0010] A pickling pipe is connected to the side of the water injection pipe, and a well washing pipe is connected to the side of the mixing injection pipe. Both the pickling pipe and the well washing pipe are equipped with shut-off valves.

[0011] When the one-way valve is open, the cross-sectional area of ​​the annulus between the conical orifice and the conical head is equal to the cross-sectional area of ​​the mother liquor injection pipe's inner hole.

[0012] The beneficial effects of this utility model are as follows: A switching component is installed inside the check valve. When the pressure in the inlet pipe section is high, the valve head is pushed onto the positioning sleeve by the switching component to open. When the pressure in the outlet pipe section is high, the valve head is pushed onto the conical hole by the switching component to close. This check valve does not require pressure to open the valve head like a spring check valve. When the mother liquor pressure is higher than the injection pressure, the check valve is in the open state. The mother liquor does not need to expend pressure to open the valve head. The flow rate and direction of the mother liquor remain unchanged when it flows through the check valve. At the same time, the entire mother liquor injection pipe is always in a straight pipeline, which reduces the degradation rate of the mother liquor. The water flowing in tangentially is pre-mixed with the mother liquor, preventing the mother liquor from being degraded by the baffles in the static mixer when it directly enters the static mixer. Attached Figure Description

[0013] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Appendix Figure 2 This is a schematic diagram of the one-way valve in this utility model;

[0015] Appendix Figure 3 It is attached Figure 2 Enlarged view of point A;

[0016] Appendix Figure 4 This is a schematic diagram of the premixer in this utility model;

[0017] Appendix Figure 5 This is a schematic diagram of the water outlet pipe section in this utility model;

[0018] Appendix Figure 6 This is a structural schematic diagram of the water inlet pipe section in this utility model.

[0019] In the diagram, 1-injection pipe, 2-mother liquor injection pipe, 3-mixing injection pipe, 4-static mixer, 5-electric regulating valve, 6-flow meter, 7-check valve, 8-premixer, 9-acid washing pipe, 10-well washing pipe, 11-outlet pipe section, 1101-outlet, 1102-valve chamber pipe, 12-inlet pipe section, 1201-inlet, 1202-conical hole, 13-valve head, 1301-conical head, 1302-guide column, 14-positioning sleeve, 15-baffle, 16-support arm, 17-upper sleeve, 18-lower sleeve, 19-compression spring, 20-mother liquor inlet, 21-water inlet, 22-mixing outlet. Detailed Implementation

[0020] like Figures 1-6 As shown, a high-pressure water distribution mother liquor metering and mixing valve group includes a water injection pipe 1, a mother liquor injection pipe 2, and a mixing injection pipe 3. Each of the water injection pipe 1, mother liquor injection pipe 2, and mixing injection pipe 3 is equipped with a shut-off valve. The water injection pipe 1 is equipped with a flow meter 6 and an electric regulating valve 5. The mother liquor injection pipe 2 is equipped with a one-way valve 7. The inlet and outlet of the one-way valve 7 are on the same axis. The water injection pipe 1 is connected to the mother liquor injection pipe 2 at the rear end of the one-way valve 7. The combined pipe of the water injection pipe 1 and the mother liquor injection pipe 2 enters the static mixer 4. The outlet of the static mixer 4 is connected to the mixing injection pipe 3.

[0021] The one-way valve 7 includes an inlet pipe section 12 and an outlet pipe section 11. The inlet pipe section 12 includes an inlet 1201, the inner diameter of which is the same as the inner diameter of the mother liquor injection pipe 2. The inlet pipe section 12 has an enlarged conical hole 1202 on the left side of the inlet 1201. The outlet pipe section 11 includes an outlet 1101, the inner diameter of which is the same as the inner diameter of the mother liquor injection pipe 2. The outlet pipe section 11 has an enlarged valve chamber pipe 1102 on the right side of the outlet 1101.

[0022] The inlet pipe section 12 and the outlet pipe section 11 are connected by bolts for sealing. A valve head 13 is installed in the valve chamber pipe 1102. A conical head 1301 is provided on the right side of the valve head 13. The conical head 1301 is conically sealed with the conical hole 1202. A guide post 1302 is provided on the left side of the valve head 13. The guide post 1302 is connected to the positioning sleeve 14 with clearance. The positioning sleeve 14 is fixed in the valve chamber pipe 1102 by the support arm 16.

[0023] A switching assembly is provided between the valve chamber tube 1102 and the valve head 13. The switching assembly includes an upper sleeve 17 and a lower sleeve 18. The upper sleeve 17 is hinged to the inner wall of the valve chamber tube 1102, and the lower sleeve 18 is hinged to the outer circle of the valve head 13. A compression spring 19 is provided between the upper sleeve 17 and the lower sleeve 18. The switching assembly prevents the valve head 13 from staying in the middle position; it either rests against the positioning sleeve 14 or against the conical hole 1202.

[0024] The guide post 1302 is connected to the baffle 15 by bolts on the left side. The outer diameter of the baffle 15 is the same as that of the valve head 13. The baffle 15 is welded to the bolts, so the pressure-bearing areas on both sides of the valve head 13 are the same, and the one-way valve 7 will not be delayed in opening and closing.

[0025] The water injection pipe 1 is connected to the mother liquor injection pipe 2 next to the pipeline at the rear end of the one-way valve 7. Instead, the mother liquor injection pipe 2 at the rear end of the one-way valve 7 is connected to the premixer 8. The premixer 8 includes a mother liquor inlet 20, a mixing outlet 22 and a water inlet 21. The mother liquor inlet 20 and the mixing outlet 22 are located on the same axis, and the water inlet 21 enters the premixer 8 tangentially.

[0026] A pickling pipe 9 is connected to the side of the water injection pipe 1, and a well washing pipe 10 is connected to the side of the mixing injection pipe 3. Both the pickling pipe 9 and the well washing pipe 10 are equipped with shut-off valves.

[0027] When the check valve 7 is open, the cross-sectional area of ​​the annulus between the conical orifice 1202 and the conical head 1301 is equal to the cross-sectional area of ​​the inner hole of the mother liquor injection pipe 2. That is, when the mother liquor flows through the check valve 7, the flow velocity and direction do not change.

[0028] A switching assembly is installed inside the check valve 7. When the pressure in the inlet pipe section 12 is high, the valve head 13 is pushed onto the positioning sleeve 14 by the switching assembly to open. When the pressure in the outlet pipe section 11 is high, the valve head 13 is pushed onto the conical hole 1202 by the switching assembly to close. This check valve 7 does not require pressure to open the valve head 13 like a spring check valve.

[0029] When the mother liquor pressure is higher than the injection water pressure, the one-way valve 7 is in the open state. The mother liquor does not need to consume pressure to open the valve head 13. When the mother liquor flows through the one-way valve 7, the flow rate and direction remain unchanged. At the same time, the entire mother liquor injection pipe 2 is always in a straight pipeline, which reduces the degradation rate of the mother liquor. The mother liquor is pre-mixed with the tangentially flowing water, which prevents the mother liquor from being degraded by the baffles in the static mixer 4 when it directly enters the static mixer 4.

Claims

1. A high-pressure water distribution mother liquor metering mixing valve group comprising a water injection pipe (1), a mother liquor injection pipe (2) and a mixing injection pipe (3), characterized in that: The water injection pipe (1), the mother liquor injection pipe (2) and the mixed injection pipe (3) are respectively provided with a shut-off valve, the water injection pipe (1) is provided with a flowmeter (6) and an electric regulating valve (5), the mother liquor injection pipe (2) is provided with a check valve (7), the inlet and outlet of the check valve (7) are on the same axis, the water injection pipe (1) is connected to the mother liquor injection pipe (2) at the rear end of the check valve (7), the combined pipe of the water injection pipe (1) and the mother liquor injection pipe (2) enters a static mixer (4), and the outlet of the static mixer (4) is connected to the mixed injection pipe (3); The check valve (7) comprises a water inlet pipe section (12) and a water outlet pipe section (11), the water inlet pipe section (12) comprises a water inlet (1201), the inner diameter of the water inlet (1201) is the same as the inner diameter of the mother liquor injection pipe (2), the water inlet pipe section (12) is provided with a conical hole (1202) with an enlarged diameter at the left side of the water inlet (1201), and the water outlet pipe section (11) comprises a water outlet (1101), the inner diameter of the water outlet (1101) is the same as the inner diameter of the mother liquor injection pipe (2), and the water outlet pipe section (11) is provided with a valve chamber pipe (1102) with an enlarged diameter at the right side of the water outlet (1101). The water inlet pipe section (12) and the water outlet pipe section (11) are connected in a bolt sealing mode, the valve chamber pipe (1102) is provided with a valve head (13), the right side of the valve head (13) is provided with a conical head (1301), the conical head (1301) is in conical sealing cooperation with the conical hole (1202), the left side of the valve head (13) is provided with a guide column (1302), the guide column (1302) is connected to a positioning sleeve (14) in a clearance fit mode, and the positioning sleeve (14) is fixed in the valve chamber pipe (1102) through a support arm (16). A switch assembly is arranged between the valve chamber pipe (1102) and the valve head (13), the switch assembly comprises an upper sleeve (17) and a lower sleeve (18), the upper sleeve (17) is hingedly connected to the inner wall of the valve chamber pipe (1102), the lower sleeve (18) is hingedly connected to the outer circle of the valve head (13), and a compression spring (19) is arranged between the upper sleeve (17) and the lower sleeve (18).

2. The high pressure water distribution master meter mixing valve package of claim 1, wherein: The left side of the guide column (1302) is connected to a baffle disc (15) through a bolt, the outer diameter of the baffle disc (15) is the same as that of the valve head (13), and the baffle disc (15) is welded to the bolt.

3. The high pressure water distribution master meter mixing valve package of claim 1, wherein: The water injection pipe (1) is connected to the mother liquor injection pipe (2) at the rear end of the check valve (7), and is replaced by: the mother liquor injection pipe (2) at the rear end of the check valve (7) is connected to a premixer (8), the premixer (8) comprises a mother liquor inlet (20), a mixed outlet (22) and a water inlet (21), the mother liquor inlet (20) and the mixed outlet (22) are located on the same axis, and the water inlet (21) enters the premixer (8) tangentially.

4. The high pressure water distribution master metering mixing valve group according to claim 1, characterized in that: The water injection pipe (1) is connected to an acid washing pipe (9), and the mixed injection pipe (3) is connected to a well washing pipe (10), and the acid washing pipe (9) and the well washing pipe (10) are respectively provided with a shut-off valve.

5. The high pressure water distribution master meter mixing valve package of claim 1, wherein: When the check valve (7) is opened, the annular cross-sectional area between the conical hole (1202) and the conical head (1301) is equal to the cross-sectional area of the inner hole of the mother liquor injection pipe (2).

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