A cyclonic downhole liquid-gas separation device
Through the three-layer overflow channel design and cyclone separator of the cyclone downhole liquid-gas separation device, the problem of associated natural gas affecting the pumping efficiency of the pumping well in the oil field during high condensed oil and heavy oil mining is solved, and the efficiency of condensation reduction and thickening reduction is improved and oil well production and improve the quality of natural gas recovery.
Patent Information
- Application Number
- CN202010751936.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-07-30
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2040-07-30
AI Technical Summary
During the oil field's high-condensation and heavy oil mining, the high-pressure discharge of associated natural gas conflicts with the injection of decondensation agent, resulting in an increase in the cost of decondensation and thickening reduction and a decrease in efficiency, affecting the oil well production.
Design a cyclone downhole liquid-gas separation device, which separates the exhaust port from the condenser and thickener injection port by forming a three-layer overflow channel, and accelerates the separation of the associated natural gas in the cyclone separator The residual oil in the process ensures the effect of reducing condensation and thickening.
It effectively separates the exhaust port and the injection port, improves the efficiency of reducing condensation and thickening, ensures oil well production, and improves the quality of associated natural gas recovery.
Smart Images
Figure CN111849576B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a mechanical device, in particular to a cyclonic downhole liquid-gas separation device. Background Art
[0002] At present, in the exploitation of high-condensate oil and heavy oil in oil fields, many production wells use the production technology of adding pour point depressant (or thin oil) to reduce pour point and viscosity. The method is: the oil pipe is installed on the big turtle cover of the oil tree, the big four-way is installed on the casing, the big turtle cover is connected to the big four-way, and the oil pipe is placed in the casing; a small amount of pour point depressant or thin oil is added from the casing gate, and it flows into the well through the oil pipe and the casing annulus, mixed with high pour point oil or heavy oil, and then produced from the inner cavity of the oil pipe. This production process technology is popular because of its low cost and quick effect. However, with the development of new technologies for the exploitation of high-condensate oil and heavy oil in oil fields, especially the development of oil field fire burning oil layer technology, many high-condensate oil production wells and heavy oil production wells have produced a large amount of associated natural gas. This associated natural gas has seriously affected the pumping efficiency of the pumping well due to its large gas volume and high casing pressure, and must be discharged and recovered. However, this large amount of high-pressure associated natural gas can only be discharged from the casing annulus, and the discharge outlet is also the casing gate. In this way, there is a conflict between exhausting gas at the outlet of the casing gate and injecting pour point depressant or thin oil. Although the exhaust port and pour point depressant injection port are on the two sides of the casing gate, because the exhaust port and pour point depressant injection port are on the same horizontal plane, a lot of pour point depressant is still carried out by the high-pressure casing gas. This not only increases the pour point depressant and viscosity reduction cost, but also reduces the pour point depressant and viscosity reduction efficiency, seriously affecting the oil well production. Summary of the invention
[0003] The invention provides a cyclone type downhole liquid-gas separation device, which can form a three-layer flow passage after being installed in conjunction with an oil production tree, and separate the exhaust port from the pour point depressant and viscosity reducing agent injection ports, thereby ensuring pour point depressant and viscosity reducing effects.
[0004] The technical solution of the present invention is as follows:
[0005] A cyclone type downhole liquid-gas separation device comprises an oil-mixed intermediate flange, a short connection, an oil-mixed outer pipe and a cyclone separator, wherein the oil-mixed intermediate flange is respectively connected to a large cuckold cap and a large four-way joint of an oil tree, the short connection is fixedly connected to the oil-mixed intermediate flange, the oil-mixed outer pipe is connected to the short connection, and the oil-mixed outer pipe is arranged between an oil pipe and a casing; the cyclone separator is installed on the oil-mixed outer pipe and is used to separate residual oil in associated natural gas.
[0006] The preferred embodiment of the cyclone downhole liquid-gas separation device is that the flange body of the oil-mixing intermediate flange is disc-shaped, an oil-mixing pipeline is provided at the center of the flange body, oil-mixing through holes are symmetrically provided on both sides of the oil-mixing pipeline, and the oil-mixing pipeline is communicated with the oil-mixing through holes; a gate clamping hole is provided at the outer end of the oil-mixing through hole, and an oil-mixing gate is installed at the gate clamping hole; threaded through holes are symmetrically provided around the oil-mixing pipeline in the circumferential direction, and the threaded through holes are used to screw in bolts to connect with the large cuckold cover and the large four-way joint of the oil tree; the lower end of the oil-mixing pipeline is fixedly connected to the short-circuit.
[0007] The preferred embodiment of the cyclone downhole liquid-gas separation device is that annular grooves are respectively provided on both sides of the flange body, and sealing rings are placed in the annular grooves. The sealing rings are used to implement the sealing between the flange body and the large cuckold cover and the large four-way joint of the oil production tree.
[0008] The preferred embodiment of the cyclone type downhole liquid-gas separation device is that the oil-mixed outer pipe is arranged between the oil pipe and the casing to form a three-layer flow channel: the inner diameter of the oil pipe is the production liquid channel, the annulus between the oil pipe and the oil-mixed outer pipe is the oil-mixed channel, and the annulus between the oil-mixed outer pipe and the casing is the exhaust channel; the large four-way valve is provided with an exhaust gate.
[0009] The cyclone-type downhole liquid-gas separation device, its preferred embodiment is that the cyclone separator includes a tube body, a spiral ring and a gear ring, one end of the tube body is provided with a boss, and the other end of the tube body is fixedly installed with the gear ring; the spiral ring is a tubular object, the outside of the spiral ring is provided with evenly arranged spiral grooves, the spiral ring is placed between the boss and the gear ring, and rolling bearings are provided between the two ends of the spiral ring and the tube body.
[0010] The preferred embodiment of the cyclone type downhole liquid-gas separation device is that the cyclone separator and the oil-mixed outer pipe are installed in series, and the number of the cyclone separators is multiple.
[0011] The preferred embodiment of the cyclone-type downhole liquid-gas separation device is that an outer tube guide shoe is provided at the lowermost end of the oil-mixed outer tube.
[0012] The beneficial effects of the present invention are as follows: the oil-mixed outer pipe of the present invention forms a concentric pipe column structure with the casing and the oil pipe, and forms a three-layer flow channel; the inner channel of the oil pipe produces oil; the annular channel between the oil-mixed outer pipe and the oil pipe mixes a pour point depressant or thin oil; the annular channel between the oil-mixed outer pipe and the casing discharges the associated natural gas in the casing; the injection port (oil-mixing gate) for mixing pour point depressant or thin oil and the discharge port (exhaust gate) of the casing gas are separated, and the distance between them is enlarged, and the oil well can be changed (deepened or reduced) according to the amount of casing gas, thereby ensuring the oil-mixing effect; the spiral ring on the cyclone separator can accelerate the rotation in the high-pressure airflow, effectively separate the residual oil in the associated natural gas, thereby ensuring the recovery quality of the casing associated natural gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is the structural diagram of the oil-mixed intermediate flange;
[0014] Figure 2 for Figure 1 Sectional view of the middle AA plane;
[0015] Figure 3 This is the installation status diagram of the oil-mixing intermediate flange, oil-mixing gate and short-circuit;
[0016] Figure 4 This is a schematic diagram of the assembly structure of a cyclone-type downhole liquid-gas separation device;
[0017] Figure 5 This is a diagram showing the installation status of the cyclone downhole liquid-gas separation device and the Christmas tree;
[0018] Figure 6 This is the installation status diagram of the oil-mixed outer pipe and the outer pipe guide shoe;
[0019] Figure 7 This is the structural diagram of the cyclone separator. DETAILED DESCRIPTION
[0020] like Figure 1-7As shown, a cyclone type downhole liquid-gas separation device comprises an oil-mixing middle flange, a short circuit 7, an oil-mixing outer pipe 12 and a cyclone separator 15. The oil-mixing middle flange is respectively connected to the large cuckold cover 9 and the large four-way 10 of the Christmas tree, the short circuit 7 is fixedly connected to the oil-mixing middle flange, and the oil-mixing outer pipe 12 is connected to the short circuit 7; the flange body 1 of the oil-mixing middle flange is disc-shaped, an oil-mixing pipeline 2 is arranged at the center of the flange body 1, and oil-mixing through holes 3 are symmetrically arranged on both sides of the oil-mixing pipeline 2, and the oil-mixing pipeline 2 is connected to the oil-mixing through holes 3. 3; the outer end of the oil mixing through hole 3 is provided with a gate clamping hole 4, and the gate clamping hole 4 is provided with an oil mixing gate 8; the oil mixing pipeline 2 is symmetrically provided with threaded through holes 5 along the circumferential direction, and the threaded through holes 5 are used to screw in bolts and connect with the big cuckold cover 9 and the big four-way 10 of the oil tree; annular grooves 6 are respectively provided on both sides of the flange body 1, and sealing rings are placed in the annular grooves 6 to implement the sealing between the flange body 1 and the big cuckold cover 9 and the big four-way 10 of the oil tree; the lower end of the oil mixing pipeline 2 is fixedly connected to the short-circuit 7; the oil mixing pipeline 2 is fixedly connected to the short-circuit 7; The oil outer pipe 12 is arranged between the oil pipe 11 and the casing 13 to form a three-layer flow passage: the inner diameter of the oil pipe 11 is the production fluid passage, the annulus between the oil pipe 11 and the oil-mixed outer pipe 12 is the oil-mixed passage, and the annulus between the oil-mixed outer pipe 12 and the casing 13 is the exhaust passage; the large four-way 10 is provided with an exhaust gate 14; the cyclone separator 15 includes a pipe body 21, a spiral ring 22 and a retaining ring 23, one end of the pipe body 21 is provided with a boss, and the other end of the pipe body 21 is fixedly installed with the retaining ring 23; the spiral ring 22 is a tubular object, The spiral ring 22 is provided with evenly arranged spiral grooves on the outside, and the spiral ring 22 is placed between the boss and the retaining ring 23. Rolling bearings 24 are provided between the two ends of the spiral ring 22 and the tube body 21. The cyclone separator 15 is installed in series with the oil-mixed outer tube 12 to separate the residual oil in the associated natural gas. The number of the cyclone separators 15 is multiple. The lower end of the oil-mixed outer tube 12 is provided with an outer tube guide shoe 16, which can prevent damage when the oil pipe 11 is pulled out.
Claims
1. A cyclonic downhole liquid-gas separation device, characterized in that: It includes an oil-mixing middle flange, a short connection, an oil-mixing outer pipe and a cyclone separator. The oil-mixing middle flange is respectively connected to the large cuckold cover and the large four-way joint of the Christmas tree. The short connection is fixedly connected to the oil-mixing middle flange. The oil-mixing outer pipe is connected to the short connection. The oil-mixing outer pipe is arranged between the oil pipe and the casing to form a three-layer flow passage. The cyclone separator is installed on the oil-mixing outer pipe to separate the residual oil in the associated natural gas. The flange body of the oil-mixing intermediate flange is disc-shaped, an oil-mixing pipeline is arranged at the center of the flange body, oil-mixing through holes are symmetrically arranged on both sides of the oil-mixing pipeline, and the oil-mixing pipeline is connected to the oil-mixing through holes; a gate clamping hole is arranged at the outer end of the oil-mixing through hole, and an oil-mixing gate is installed at the gate clamping hole; threaded through holes are symmetrically arranged around the oil-mixing pipeline along the circumferential direction, and the threaded through holes are used to screw in bolts to connect with the large cuckold cover and the large cross-piece of the oil tree; the lower end of the oil-mixing pipeline is fixedly connected to the short-circuit; The cyclone separator comprises a tube body, a spiral ring and a retaining ring, wherein a boss is provided at one end of the tube body, and the retaining ring is fixedly installed at the other end of the tube body; the spiral ring is a tubular object, and spiral grooves arranged evenly are provided on the outside of the spiral ring, the spiral ring is placed between the boss and the retaining ring, and rolling bearings are provided between the two ends of the spiral ring and the tube body; The number of the cyclone separators is multiple.
2. The cyclone type downhole liquid-gas separation device according to claim 1, characterized in that: Annular grooves are respectively provided on both sides of the flange body, and sealing rings are placed in the annular grooves. The sealing rings are used to implement sealing between the flange body and the large cuckold cover and the large four-way joint of the oil production tree.
3. The cyclone type downhole liquid-gas separation device according to claim 1, characterized in that: The inner diameter of the oil pipe is the production fluid channel, the annulus between the oil pipe and the oil-mixed outer pipe is the oil-mixing channel, and the annulus between the oil-mixed outer pipe and the casing is the exhaust channel; the large four-way is provided with an exhaust gate.
4. The cyclone type downhole liquid-gas separation device according to claim 1, characterized in that: An outer tube guide shoe is arranged at the lowermost end of the oil-mixed outer tube.