Underground composite sand-prevention oil-gas separation device

Abstract

The utility model discloses an underground combined type sand prevention oil-gas separation device which is characterized in that the upper end of an oil well pump is connected with a gas distribution oil pipe nipple, a gas distribution valve is arranged on the outer side edge of the gas distribution oil pipe nipple, and gas in an annular space of an oil sleeve is automatically input into the gas distribution oil pipe nipple through the gas distribution valve under certain gas pressure; the lower end of the oil well pump is connected with a sand-prevention oil-gas separator, the sand-prevention oil-gas separator pumps mixed liquid into the sand-prevention oil-gas separator after the oil well pump works, gas in the mixed liquid is separated out through the sand-prevention oil-gas separator, and sand grains and impurities are stripped off through the sand-prevention oil-gas separator. The oil well pump has the advantages of being capable of avoiding gas locking and sand blocking of the oil well pump, improving the liquid production efficiency of the oil well pump, prolonging the service life and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of oil field downhole equipment, in particular to an downhole composite sand prevention oil and gas separation device. Background Art

[0002] During the deep well pumping period, the oil field is produced under the condition that the bottom flow pressure is lower than the saturation pressure. Even when the oil field is produced under the saturation pressure, the pump port is lower than the saturation pressure when the oil field pump is working. Therefore, when the oil field pump is working, both gas and liquid always enter the oil field pump at the same time. The gas entering the oil field pump will inevitably reduce the amount of liquid entering the oil field pump, thereby reducing the pump efficiency. When the gas in the pump chamber of the oil field pump occupies a large amount of effective space, it will make it difficult to open the floating valve and the fixed valve. The oil field pump may be gas locked and the liquid cannot be pumped out. In addition, the sand particles in the liquid mixed liquid enter the pump chamber of the oil field pump, which may cause the pump to get stuck, making the oil field pump unable to work and resulting in low production efficiency. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an underground composite sand-proof oil and gas separation device which can avoid gas lock and pump jam of the oil pump and ensure the mining efficiency.

[0004] In order to solve the above-mentioned technical problems, the utility model includes a downhole composite sand-proof oil and gas separation device, whose structural characteristics are: the upper end of the oil pump is connected to an end gas distribution oil pipe short section, and the outer side edge of the gas distribution oil pipe short section is provided with a gas distribution valve that can adjust the air pressure in the annular space of the oil casing; two gas distribution valves are provided on the outer edge of the gas distribution oil pipe short section and are staggered up and down, and the lower end of the oil pump is connected to a sand-proof oil and gas separator that can separate gas in liquid and prevent sand.

[0005] After adopting the above structure, when the oil pump extracts the mixed liquid in the well, the extracted mixed liquid enters the oil pump again through the sand-proof oil and gas separator, and the gas in the mixed liquid is separated by the sand-proof oil and gas separator. At the same time, the sand particles in the mixed liquid are separated by the sand-proof oil and gas separator to prevent the sand particles from entering the oil pump; the upper end of the oil pump is connected with a gas distribution oil pipe short section, and the separated liquid pumped by the oil pump enters the gas distribution oil pipe short section. The gas distribution valve on the outer side of the gas distribution oil pipe short section can adjust the air pressure in the annular space of the oil casing, so that the air pressure in the annular space of the oil casing is kept matching with the oil pump, achieving the purpose of mechanical pumping and gas lift-assisted pumping in the oil pipe and the annular space of the oil casing, further avoiding gas lock and sand jam of the oil pump, and at the same time, two upper and lower staggered gas distribution valves on the outer edge of the gas distribution oil pipe short section are respectively located on the left and right sides of the gas distribution oil pipe short section, so that the gas in the annular space of the oil casing maintains the same pressure within a range of 360°, reduces the pumping resistance of the oil pump, and improves the pump efficiency.

[0006] The sand-proof oil-gas separator comprises an outer jacket, the upper end of which is threadedly connected to the oil pump, a central tube is provided at the inner center of the outer jacket, a separation chamber is provided between the central tube and the outer jacket, a plurality of liquid inlet holes which can penetrate the side wall of the outer jacket are provided on the upper part of the outer jacket, an oil-gas separation umbrella which is spirally arranged around the central tube is provided outside the central tube, the oil-gas separation umbrella can separate the gas in the liquid which enters from the liquid inlet hole, a pressure reducer is provided at the lower part of the oil-gas separation umbrella, a pressure stabilizer which can move up and down is provided at the lower end of the pressure reducer, a sand settling chamber which can separate sand particles in the liquid is provided at the lower side of the separation chamber, a through hole is provided between the separation chamber and the sand settling chamber, the sand settling chamber and the central tube are interconnected, and a filter screen is provided between the sand settling chamber and the central tube. When the oil pump is working , the mixed liquid in the well enters the separation chamber from the liquid inlet hole, and after entering the separation chamber, it rotates and falls through the upper end surface of the oil and gas separation umbrella. After passing through the oil and gas separation umbrella, the gas in the mixed liquid is separated by the oil and gas separation umbrella, and the separated gas is discharged from the liquid inlet hole. When the liquid that has been separated once passes through the pressure reducer, when the pressure is high or low when the liquid goes down, the pressure stabilizer rises or sinks, and the pressure reducer performs secondary gas separation while reducing the pressure. The liquid after two separations enters the sand settling hole through the through hole, enters the center pipe after being filtered by the filter device, and is pumped into the short section of the gas distribution oil pipe by the oil pump through the center pipe. The secondary separation and filtration of the sand-proof oil and gas separator can avoid gas lock and pump jam of the oil pump, thereby ensuring the liquid intake quality of the oil pump.

[0007] The liquid inlet holes are arranged in two rows and each row is evenly arranged around the side wall of the outer sleeve. The two rows of liquid inlet holes ensure that liquid inlet and gas outlet can be carried out simultaneously, and at the same time ensure the efficiency of liquid inlet. The evenly arranged liquid inlet holes ensure the uniformity and stability of liquid inlet and gas outlet, and ensure the efficiency of the oil pump.

[0008] The upper end of the oil-gas separation umbrella is higher than the upper end of the liquid inlet hole, and the lower end of the oil-gas separation umbrella is lower than the liquid inlet hole, so that all the liquid entering the separation chamber can fall through the umbrella surface of the oil-gas separation umbrella, thereby ensuring the quality of gas separation and further ensuring the efficiency of the sand control oil-gas separator.

[0009] The pressure reducer is provided with a plurality of flow holes arranged in an interlaced manner, and the mixed liquid falls in an interlaced manner through the flow holes, and cooperates with the pressure stabilizer to reduce the pressure of the liquid, thereby achieving matching of the pressure in the pipe with the pressure resistance strength of the oil pump, and protecting the service life of the oil pump.

[0010] The filtering device is a screen, which performs filtering so that sand particles and other impurities contained in the upper mixed liquid cannot enter the central pipe, but sink into the tail pipe through the sand settling holes. By utilizing the difference in density and specific gravity and instantaneous pressure reduction, the oil, gas and sand are separated and each reaches the interval where they should be stored, thereby ensuring the stability of the main oil pump.

[0011] The cam is provided with a valve at the upper end of the right-angle ventilation elbow, and a spring is provided at the upper end of the valve. A sliding valve is provided at the upper end of the spring, and the inner side of the upper end of the sliding valve is arc-shaped, and the arc is connected to the main control nozzle. After the gas distribution oil pipe short section is adopted, when the gas pressure in the annular space of the oil casing is greater than the pressure in the oil pipe liquid, the sliding valve in the gas distribution valve is in an open state under a certain pressure. To avoid gas lock, the gas in the annular space of the oil casing presses the sliding valve through the main control nozzle, and the sliding valve pushes the spring to open the valve, and the gas enters the gas distribution oil pipe short section through the intake channel, thereby reducing the gas pressure in the annular space of the oil casing and avoiding gas lock of the oil pump; when the pressure of the liquid column in the oil pipe is higher than the pressure of the gas in the annular space of the oil casing, the sliding valve returns to a closed state. At this time, the air pressure in the annular space of the oil casing matches the oil well pump, realizing air lift assistance for the oil well pump and improving the efficiency of the oil well pump in pumping liquid.

[0012] In summary, the utility model has the advantages of being able to avoid air lock and sand jam of the oil well pump, improving the efficiency of the oil well pump, and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0014] Figure 2 It is a structural schematic diagram of a sand control oil and gas separator;

[0015] Figure 3 This is a structural diagram of the gas distribution oil pipe short section. DETAILED DESCRIPTION

[0016] like Figure 1 As shown, the upper end of the oil pump 1 is connected to a gas distribution oil pipe short section 2, and two gas distribution valves 3 arranged in a staggered manner are arranged on the outer edge of the gas distribution oil pipe short section 2; the lower end of the oil pump 1 is installed with a sand-proof oil and gas separator 4, the lower end of the sand-proof oil and gas separator 4 is connected to a tail pipe 5, and the lower end of the tail pipe 5 is connected to a threaded plug 6, and the above connection methods are all threaded connections. When the oil pump 1 is working, the gas in the mixed liquid extracted is precipitated through the sand-proof oil and gas separator 4, and the sand particles and other impurities are filtered at the same time. The gas pressure in the annular space of the oil casing is adjusted through the gas distribution oil pipe short section 3, further avoiding the phenomenon of gas lock and failure to pump out liquid in the oil pump 1, and ensuring the stability of the oil field during the deep well oil pump exploitation period.

[0017] like Figure 2As shown, the sand control oil and gas separator 4 includes a jacket 41, the upper end of the jacket 41 is provided with an upper joint connected to the oil pump, the upper end of the jacket 41 is threadedly connected to the oil pump 1, the lower end of the jacket 41 is provided with a lower joint connected to the tail pipe, and the inner center of the jacket 41 is provided with a central tube 42, and the central tube 42 extends along the center of the jacket 41 to the top of the upper joint. The jacket 41 is provided with an upper partition plate and a lower partition plate, and the upper partition plate and the lower partition plate are both located between the central plate and the side wall of the outer tube. A separation chamber 43 is formed between the upper partition plate, the lower partition plate, the side wall of the central tube 42 and the side wall of the jacket 41, and an oil and gas separation umbrella 45 and a pressure reducer 46 capable of separating gas are provided in the separation chamber 43. The oil and gas separation umbrella 45 is located outside the central tube 42 and is spirally arranged around the central tube 42. The upper part of the outer surface of the jacket 41 is provided with a plurality of liquid inlet holes 44 that penetrate the separation chamber 43, and the liquid inlet holes 44 are evenly arranged around the jacket 41. In this embodiment, the liquid inlet holes 44 are arranged in two rows, upper and lower, and the upper and lower rows of liquid inlet holes 44 are evenly arranged around the outer jacket 41. The two rows of liquid inlet holes 44 ensure that liquid inlet and gas outlet can be carried out simultaneously, and at the same time ensure the efficiency of liquid inlet. The evenly arranged liquid inlet holes 44 ensure the uniformity and stability of liquid inlet and gas outlet, and ensure the efficiency of oil pumping 1. A spirally arranged oil and gas separation umbrella 45 is provided on the surface of the central tube liquid 42. The top of the spiral umbrella of the oil and gas separation umbrella 45 is higher than the top of the liquid inlet hole 44, and the bottom of the spiral umbrella of the oil and gas separation umbrella 45 is lower than the bottom of the liquid inlet hole 44. When the mixed liquid enters the outer jacket 41 from the liquid inlet hole 44, it is ensured that the mixed liquid first passes through the oil and gas separation umbrella 45 and slides down along the spiral of the oil and gas separation umbrella 45. During the spiral rotation process, part of the gas is discharged from the umbrella surface of the oil and gas separation umbrella 45 and discharged from the liquid inlet hole 44. A pressure reducer 46 is provided at the lower end of the oil-gas separation umbrella 45, and a pressure stabilizer 47 that can move up and down is provided at the bottom of the pressure reducer 46. Irregular and interlaced flow holes are provided in the pressure stabilizer 47. After the gas and liquid separated by the oil-gas separation umbrella 45 pass through the pressure reducer 46, the gas in the gas and liquid is further separated during the up and down movement of the pressure reducer 46. The oil liquid falls through the flow holes in an interlaced manner, and the pressure stabilizer 47 is used to reduce the pressure of the liquid, so that the gas pressure in the annular space of the oil casing is matched with the pressure resistance strength of the oil pump 1, thereby protecting the service life of the oil pump 1. The lower partition plate is located on the lower side of the pressure stabilizer 47, and a through hole is provided on the lower partition plate. The separated liquid enters the lower side of the lower partition plate. A sand settling chamber 48 is provided on the lower side of the lower partition plate, and a filtering device 49 is provided between the sand settling chamber sand 48 and the center tube 42. In this embodiment, the filter device 49 is a tubular screen disposed on the lower side of the central tube 42, and the diameter of the screen is not less than the diameter of the central tube 42, so that all liquids entering the lower side of the lower partition plate are filtered by the screen and enter the central tube 42. An annular sand settling hole is provided between the screen and the lower joint, and the sand and other impurities in the liquid filtered by the screen are blocked by the screen, and the sand and impurities sink into the tail pipe 5 to avoid clogging the screen.A plug 6 is provided at the lower end of the tail pipe 5, and the plug 6 is used to collect sand and impurities, which is convenient for subsequent cleaning and prevents sand from entering the separated liquid again, causing difficulty in subsequent oil pumping. The separated liquid entering the central pipe 42 is extracted and transported upward by the oil pump 1, which prevents gas from entering the pump body and causing gas lock of the oil pump 1, so that the oil pump 1 can stably extract liquid, thereby stabilizing the pump efficiency, and at the same time prevents sand from entering the pump body and damaging the service life of the pump body.

[0018] Two gas distribution valves 3 are arranged on the outer edge of the gas distribution oil pipe short section 2 at the upper end of the oil well pump 1, and an air inlet channel 21 corresponding to the gas distribution valve 3 is arranged on the gas distribution oil pipe short section 2. The structure of the gas distribution valve 3 includes a right-angle vent elbow 35 connected to the air inlet channel 21, a valve 31 is arranged on the upper end of the right-angle vent elbow 35, a spring 33 is arranged on the upper end of the valve 31, a slide valve 32 is arranged on the upper end of the spring 33, and the front end of the slide valve 32 is connected to the main control nozzle 36 in an arc shape. When a certain pressure is reached in the annular space of the oil casing, the gas pushes the slide valve 32 through the main control nozzle 36 to shrink the spring 33. After the spring 33 shrinks, the air inlet channel is connected with the valve 34 and the right-angle vent elbow 35, and the valve 31 allows the gas to flow in one direction. The gas flows into the gas distribution oil pipe short section 2 through the gas distribution valve 3, so that the gas pressure in the annular space of the oil casing is less than a certain value, thereby avoiding gas lock of the oil well pump 1. When the liquid column pressure in the gas distribution oil pipe short section 2 is lower than the gas pressure in the oil annular space of the oil casing, the sliding valve 32 returns to its original position and the gas distribution valve 3 is closed, so that the gas pressure in the gas distribution oil pipe short section 2 is maintained to match the oil pump 1, thereby achieving the effects of mechanical pumping in the gas distribution oil pipe short section 2 and gas lift to increase production in the oil casing annular space.

Claims

1. A downhole composite sand control oil and gas separation device, comprising a well pump (1), characterized in that: The upper end of the oil pump (1) is connected to a gas distribution oil pipe short section (2), and the outer edge of the gas distribution oil pipe short section (2) is provided with a gas distribution valve (3) capable of adjusting the air pressure in the annular space of the oil casing, and the outer edge of the gas distribution oil pipe short section (2) is provided with two gas distribution valves (3) staggered up and down; the lower end of the oil pump (1) is connected to a sand-proof oil-gas separator (4) capable of separating gas in a mixed liquid and preventing sand.

2. A downhole composite sand control oil and gas separation device as claimed in claim 1, characterized in that: The sand control oil and gas separator (4) comprises an outer sleeve (41), the upper end of the outer sleeve (41) is threadedly connected to the oil pump (1), a central tube (42) is provided at the inner center of the outer sleeve (41), a separation chamber (43) is provided between the central tube (42) and the outer sleeve (41), a plurality of liquid inlet holes (44) that can penetrate the side wall of the outer sleeve (41) are provided at the upper part of the outer sleeve (41), an oil and gas separation umbrella (45) that is spirally arranged around the central tube (42) is provided outside the central tube (42), and the oil and gas separation umbrella (45) can separate The gas in the mixed liquid enters from the liquid inlet hole (44), a pressure reducer (46) is provided at the lower part of the oil-gas separation umbrella (45), a pressure stabilizer (47) that can move up and down is provided at the lower end of the pressure reducer (46), a sand settling chamber (48) that can separate sand particles and impurities in the mixed liquid is provided at the lower side of the separation chamber (43), a through hole is provided between the separation chamber (43) and the sand settling chamber (48), the sand settling chamber (48) and the central tube (42) are interconnected, and a filtering device (49) is provided between the sand settling chamber (48) and the central tube (42).

3. A downhole composite sand control oil and gas separation device as claimed in claim 2, characterized in that: The liquid inlet holes (44) are provided in two rows, and each row is evenly arranged around the side wall of the outer sleeve (41).

4. A downhole composite sand control oil and gas separation device as claimed in claim 2, characterized in that: The upper end of the oil-gas separation umbrella (45) is higher than the upper end of the liquid inlet hole (44), and the lower end of the oil-gas separation umbrella (45) is lower than the liquid inlet hole (44).

5. The downhole composite sand control oil and gas separation device according to claim 2, characterized in that: The pressure reducer (46) is provided with a plurality of flow holes arranged in an interlaced manner.

6. A downhole composite sand control oil and gas separation device as claimed in claim 2, characterized in that: The filtering device (49) is a screen.

7. The downhole composite sand control oil and gas separation device according to claim 1, characterized in that: An air intake passage (21) is provided on the edge of the side wall of the oil distribution pipe air nipple (2). The oil distribution pipe nipple (2) comprises a right-angled ventilating elbow (35) corresponding to the position of the air intake passage (21) and threadedly connected thereto. A valve (34) is provided at the upper end of the right-angled ventilating elbow. A spring (33) is provided at the upper end of the valve (34). A slide valve (32) is provided at the upper end of the spring (33). The inner side of the upper end of the slide valve (32) is arc-shaped and the arc is externally connected to a main control nozzle (36).

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