A sand-proof oil-gas separator for screw drilling tools

Abstract

The invention relates to a sand-proof oil-gas separator for a screw drill, comprising an outer tube, an adapter sleeve, an inner tube, a sand filter assembly and an exhaust assembly; the inner tube is concentrically arranged inside the outer tube, the lower end of the adapter sleeve is sleeved and fixed on the outer side of the upper end of the inner tube and inserted into the inner side of the upper end of the outer tube, the exhaust assembly is arranged between the adapter sleeve and the outer tube, and the sand filter assembly is arranged on the lower outer side of the inner tube and inside the outer tube; the invention separates a sand removal channel and a gas removal channel to prevent the oil flow in the pipeline from becoming smaller, thereby effectively ensuring the normal transportation of the oil, without the need for frequent shutdown and cleaning, thereby improving work efficiency.

Description

Technical Field

[0001] The invention relates to a sand-proof oil-gas separator for a screw drill. Background Art

[0002] A screw drill is a type of volumetric downhole power drill that uses drilling fluid as its motive force and converts liquid pressure energy into mechanical energy. It is commonly used in the process of oil extraction. When the screw drill is working, it uses its drill bit to drill an oil well in the oil field. When the drill bit contacts the oil, the oil pump starts working to extract the oil. Because the oil is mixed with a large amount of gas and sand particles of varying sizes, too much sand particles can easily cause the oil pump to get stuck, and too much gas can easily cause gas lock in the pipeline. Therefore, the gas and sand particles in the oil must be removed during extraction.

[0003] The existing method for degassing and desanding is to install an oil-gas separator and multiple screens in the drill bit. After the oil flows through the screen, the sand particles are separated, and after the oil flows through the oil-gas separator, the gas is separated. However, since the sand removal and degassing share the same channel, the sand particles separated by the screen cannot fall completely under the push of the gas, which makes the effective flow area of ​​the screen smaller and smaller, and ultimately causes the oil to be unable to pass through the screen quickly, resulting in a smaller and smaller oil flow in the pipeline. In severe cases, the flow is even interrupted, affecting the transportation of oil. The machine can only be frequently shut down, the drill bit must be pulled out and the screen must be cleaned before it can be used again, and the working efficiency is extremely low. Summary of the invention

[0004] In view of the current status of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a sand-proof oil-gas separator for a screw drilling tool which separates the sand removal channel and the gas removal channel to prevent the oil flow in the pipeline from decreasing, thereby effectively ensuring the normal transportation of oil and improving work efficiency.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a sand-proof oil-gas separator for a screw drill, characterized in that it includes an outer tube, an adapter sleeve, an inner tube, a sand filter assembly and an exhaust assembly; the inner tube is concentrically arranged inside the outer tube, the lower end of the adapter sleeve is sleeved and fixed on the outside of the upper end of the inner tube and inserted into the upper end of the outer tube, the exhaust assembly is arranged between the adapter sleeve and the outer tube, the sand filter assembly is arranged on the outer side of the lower part of the inner tube and arranged inside the outer tube, the upper outer part of the inner tube is provided with a plurality of oil inlet hole units distributed at equal angles along the circumferential direction, the oil inlet hole unit includes a plurality of vertically arranged oil inlet holes, and the sand filter assembly includes a first positioning sleeve, a guide sleeve, a distance sleeve, a sand filter plate, a second positioning sleeve, a plug and an isolation plate; the first positioning sleeve is sleeved and fixed outside the inner tube and is arranged on a plurality of oil inlet hole units , the second positioning sleeve is fixed on the outside of the inner tube and arranged below the first positioning sleeve, a plurality of vertically arranged guide sleeves are provided between the first positioning sleeve and the second positioning sleeve, a distance sleeve is provided between any two adjacent guide sleeves, the outer side of the guide sleeve is formed with spiral strips outward, and the outer side of the distance sleeve is provided with and fixed with two sand filter plates, one side of each of the two sand filter plates is formed with an arched notch, the arched notches on the two sand filter plates are arranged diagonally to each other, and a plurality of sand filter holes are also provided in the sand filter plates, the isolation plate is transversely and sealingly fixed on the inner wall of the outer tube and arranged below the inner tube, the plug is provided between the isolation plate and the inner tube, the upper end of the plug is inserted and fixed inside the lower end of the inner tube, the lower end of the plug is fixed on the isolation plate, and a plurality of isolation holes are provided in the isolation plate.

[0006] Preferably, a retaining ring is formed outwardly at the upper end of the first positioning sleeve, the outer edge of the retaining ring is sealed and fixed on the inner wall of the outer tube, and a plurality of liquid inlet notches are formed at the edge of the retaining ring.

[0007] Preferably, the exhaust assembly includes a steel ball, an air inlet sleeve, a pressure stabilizing sleeve, a pressure equalizing sleeve and an air outlet sleeve, and the air inlet sleeve, the pressure stabilizing sleeve, the pressure equalizing sleeve and the air outlet sleeve are sequentially mounted and fixed on the outside of the adapter sleeve from bottom to top, and the upper end of the air inlet sleeve is provided with a first circumferentially distributed groove, and the lower end of the air inlet sleeve is provided with a plurality of first air inlet holes distributed at equal angles along the circumferential direction. Correspondingly, the lower end of the pressure stabilizing sleeve is provided with the same number of second air inlet holes, and the plurality of second air inlet holes are respectively concentrically arranged with the plurality of first air inlet holes, and the upper end of each of the first air inlet holes is interconnected with the bottom surface of the first groove, and a steel ball is provided at the inner lower end of each of the second air inlet holes.

[0008] Preferably, a second annularly distributed groove is provided at the upper end of the pressure stabilizing sleeve, and the second groove is interconnected with the upper end of each second air inlet hole, the width of the first groove is larger than the inner diameter of the first air inlet hole and smaller than the inner diameter of the second air inlet hole, and the width of the second groove is smaller than the inner diameter of the second air inlet hole.

[0009] Preferably, the pressure equalizing sleeve is provided with a plurality of air holes distributed at equal angles along the circumferential direction, the lower end of each of the air holes is interconnected with the interior of the second groove, the inner diameter of the air holes is smaller than the width of the second groove, the lower end of the air outlet sleeve is provided with a third groove distributed circumferentially, the upper end of each of the air holes is interconnected with the interior of the third groove, the inner diameter of the air holes is smaller than the width of the third groove, and the outer inner wall of the third groove is provided with a plurality of air outlet holes distributed at equal angles along the circumferential direction.

[0010] Preferably, a circumferentially distributed arc surface is formed inside the lower opening of the second air inlet hole, and the lower end of the steel ball is attached to the arc surface and cooperates with the upper opening of the first sink groove.

[0011] Preferably, a convex sleeve is formed downwardly on the lower end edge of the air inlet sleeve, the convex sleeve is arranged on the outside of the plurality of first air inlet holes, and the convex sleeve is inserted and fixed inside the upper end of the outer tube.

[0012] Preferably, it also includes a transition pipe, an oil inlet nozzle and an oil outlet nozzle, the oil outlet nozzle is arranged above the adapter sleeve, the transition pipe is arranged between the oil outlet nozzle and the adapter sleeve, the upper and lower ends of the transition pipe are respectively inserted and fixed in the lower end of the oil outlet nozzle and the upper end of the adapter sleeve, the oil inlet nozzle is arranged below the outer tube, and the upper end of the oil inlet nozzle is inserted and fixed in the lower end of the outer tube.

[0013] Compared with the prior art, the advantages of the present invention are: the present invention separates the sand removal channel and the degassing channel, and in the sand removal channel, firstly, large sand particles are isolated by means of a plurality of isolation holes in the isolation plate, and then, with the help of a plurality of spiral strips on the guide sleeves and the use of gas doped in the oil, the oil is formed into a spiral ascending vortex, and then, under the action of the two sand filter plates on each fixed distance sleeve, small sand particles are isolated, and the arch-shaped notch is used to ensure the rising flow rate of the oil to prevent the oil flow rate in the pipeline from becoming smaller, thereby effectively ensuring the normal transportation of the oil, without the need for frequent shutdown and cleaning, thereby improving work efficiency; in the degassing channel, only when the gas in the air intake sleeve is greater than the sum of the gravity of the steel ball and the atmospheric pressure, the gas will enter the pressure stabilizing sleeve, thereby ensuring the pressure between the inner tube and the outer tube, so as to ensure that the oil passes through the plurality of oil inlet holes and enters the inner tube, further ensuring the normal transportation of the oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an oblique cross-sectional structural diagram of the present invention;

[0015] Figure 2 It is a partial enlarged structural diagram of the present invention at position A;

[0016] Figure 3 It is a partial enlarged structural diagram of the present invention at position B;

[0017] Figure 4 It is a partial enlarged structural diagram of the present invention at position C;

[0018] Figure 5 It is a partial enlarged structural diagram of the present invention at D. DETAILED DESCRIPTION

[0019] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] In order to keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of well-known functions and well-known components are omitted.

[0021] like Figures 1 to 5As shown, a sand-proof oil-gas separator for a screw drill comprises an outer tube 1, an adapter sleeve 6, an inner tube 10, a sand filter assembly and an exhaust assembly; the inner tube 10 is concentrically arranged inside the outer tube 1, the lower end of the adapter sleeve 6 is sleeved and fixed on the outer end of the inner tube 10 and inserted into the upper end of the outer tube 1, the exhaust assembly is arranged between the adapter sleeve 6 and the outer tube 1, the sand filter assembly is arranged on the lower outer side of the inner tube 10 and arranged inside the outer tube 1, and the upper outer side of the inner tube 10 is provided with a plurality of circumferentially equiangularly spaced sand filter assemblies. The oil inlet hole unit is provided with a plurality of vertically arranged oil inlet holes 101, and the sand filter assembly comprises a first positioning sleeve 11, a guide sleeve 12, a distance sleeve 13, a sand filter plate 14, a second positioning sleeve 18, a plug 15 and a separation plate 16; the first positioning sleeve 11 is sleeved and fixed on the outside of the inner tube 10 and arranged below the plurality of oil inlet hole units, the second positioning sleeve 18 is sleeved and fixed on the outside of the inner tube 10 and arranged below the first positioning sleeve 11, and the first positioning sleeve 11 and the second positioning sleeve 18 are arranged between A plurality of vertically arranged guide sleeves 12 are provided, and a distance sleeve 13 is provided between any two adjacent guide sleeves 12. A spiral strip 121 is formed outwardly on the outer side of the guide sleeve 12. Two sand filter plates 14 are fixedly sleeved on the outer side of the distance sleeve 13. An arcuate notch 141 is formed on one side of the two sand filter plates 14. The arcuate notches 141 on the two sand filter plates 14 are arranged diagonally to each other. A plurality of sand filter holes 142 are also provided in the sand filter plate 14. The isolation plate 16 is horizontally and sealed and fixed On the inner wall of the outer tube 1 and below the inner tube 10, the plug 15 is arranged between the isolation plate 16 and the inner tube 10, the upper end of the plug 15 is inserted and fixed inside the lower end of the inner tube 10, the lower ends of the plugs 1, 5 are fixed on the isolation plate 16, and a plurality of isolation holes 161 are opened in the isolation plate 16. A retaining ring 111 is formed outwardly at the upper end of the first positioning sleeve 11, and the outer edge of the retaining ring 111 is sealed and fixed on the inner wall of the outer tube 1, and a plurality of liquid inlet notches 112 are opened on the edge of the retaining ring 111.

[0022] The exhaust assembly includes a steel ball 17, an air inlet sleeve 2, a pressure stabilizing sleeve 3, a pressure equalizing sleeve 4 and an air outlet sleeve 5. The air inlet sleeve 2, the pressure stabilizing sleeve 3, the pressure equalizing sleeve 4 and the air outlet sleeve 5 are sequentially sleeved and fixed on the outside of the adapter sleeve 6 from bottom to top. The upper end of the air inlet sleeve 2 is provided with a first sink groove 21 distributed in an annular direction, and the lower end of the air inlet sleeve 2 is provided with a plurality of first air inlet holes 23 distributed at equal angles along the circumferential direction. Correspondingly, the lower end of the pressure stabilizing sleeve 3 is provided with the same number of second air inlet holes 31, and the plurality of second air inlet holes 3 1 are respectively arranged concentrically with a plurality of first air inlet holes 23, the upper end of each first air inlet hole 23 is interconnected with the bottom surface of the first sink 21, a steel ball 17 is arranged at the inner lower end of each second air inlet hole 31, the upper end of the pressure stabilizing sleeve 3 is provided with an annularly distributed second sink 32, the second sink 32 is interconnected with the upper end of each second air inlet hole 31, the width of the first sink 21 is greater than the inner diameter of the first air inlet hole 23 and smaller than the inner diameter of the second air inlet hole 31, and the second sink The width of the second air inlet hole 32 is smaller than the inner diameter of the second air inlet hole 31; the pressure equalizing sleeve 4 is provided with a plurality of air holes 41 distributed at equal angles along the circumferential direction, the lower end of each air hole 41 is interconnected with the interior of the second sink groove 32, and the inner diameter of the air hole 41 is smaller than the width of the second sink groove 32; the lower end of the air outlet sleeve 5 is provided with a third sink groove 51 distributed in an annular direction, the upper end of each air hole 41 is interconnected with the interior of the third sink groove 51, and the inner diameter of the air hole 41 is smaller than the width of the second sink groove 32; The width of the third groove 51 is formed on the outer inner wall of the third groove 51 with multiple air outlet holes 52 distributed at equal angles in the circumferential direction; the lower end opening of the second air inlet hole 31 is formed with a circumferentially distributed arc surface 33, and the lower end of the steel ball 17 is attached to the arc surface 33 and cooperates with the upper end opening of the first groove 21; the lower end edge of the air inlet sleeve 2 is formed with a convex sleeve 22 downward, and the convex sleeve 22 is arranged on the outer side of the multiple first air inlet holes 23, and the convex sleeve 22 is inserted and fixed inside the upper end of the outer tube 1.

[0023] A sand-proof oil-gas separator for a screw drill also includes a transition pipe 7, an oil inlet nozzle 9 and an oil outlet nozzle 8. The oil outlet nozzle 8 is arranged above the adapter sleeve 6, and the transition pipe 7 is arranged between the oil outlet nozzle 8 and the adapter sleeve 6. The upper and lower ends of the transition pipe 7 are respectively inserted and fixed in the lower end of the oil outlet nozzle 8 and the upper end of the adapter sleeve 6. The oil inlet nozzle 9 is arranged below the outer tube 1, and the upper end of the oil inlet nozzle 9 is inserted and fixed in the lower end of the outer tube 1.

[0024] When in use, the oil inlet nozzle 9 is inserted into the oil well and extended into the oil, and then the oil outlet nozzle 8 is connected to the oil pump. Under the operation of the oil pump, the oil flows upward through the oil inlet nozzle 9 into the lower end of the outer tube 1, and then passes through the multiple isolation holes 161 in the isolation plate 16 and enters the area between the outer tube 1 and the lower half of the inner tube 10. The isolation holes 161 can prevent large impurity particles from continuing to rise; then, the oil between the outer tube 1 and the inner tube 10 continues to rise, and then when it flows through the outside of the multiple guide sleeves 12, the spiral strips 121 on each guide sleeve 12 Under the action of the spiral upward circulation, a spiral upward circulation is formed, and when the oil circulation flows through the outside of each fixed distance sleeve 13, it will be divided into two streams. One stream of oil continues to rise through the multiple sand filter holes 142 in the lower sand filter plate 14 and continues to rise with the help of the multiple sand filter holes 142 to block the small particles of sand. The other stream of oil continues to rise through the arched notch 141 on the lower sand filter plate 14 and is divided into two streams again. One stream of oil flows upward through the multiple sand filter holes 142 in the upper sand filter plate 14, and the other stream of oil changes direction and flows through the arched notch 141 on the upper sand filter plate 14 The oil continues to rise through the opening 141, and so on, thereby filtering out small particles of sand mixed in the oil; when the oil rises to the outside of the first positioning sleeve 11, it will enter between the outer tube 1 and the upper part of the inner tube 10 through the multiple liquid inlet notches 112. When the oil gradually exceeds the multiple oil inlet holes 101, the oil will enter the interior of the inner tube 10 through the multiple oil inlet holes 101, and then continue to flow upward through the adapter sleeve 6 and the transition pipe 7, and finally output to the outside through the oil outlet nozzle 8; the gas existing between the outer tube 1 and the upper part of the inner tube 10 will go upward through the multiple first air inlet holes 23 After entering the first trough 21, when the pressure reaches a certain level, the gas stored in the first trough 21 will slightly push up the multiple steel balls 17 and enter each second air inlet hole 31 through the gap between each steel ball 17 and the arc surface 33. Then, the gas in the multiple second air inlet holes 31 enters the second trough 32, and then enters the third trough 51 through the multiple air vents 41, and is finally discharged outward through the multiple air outlet holes 52. Since the inner diameter of the air vent 41 is smaller than that of the second trough 32, the gas flow rate is accelerated when the gas passes through the multiple air vents 41.

[0025] The present invention separates the sand removal channel and the degassing channel. In the sand removal channel, large sand particles are first isolated with the help of multiple isolation holes 161 in the isolation plate 16, and then the spiral strips 121 on the multiple guide sleeves 12 and the gas mixed in the oil are used to make the oil form a spiral upward vortex, and then the small sand particles are isolated under the action of the two sand filter plates 14 on each fixed distance sleeve 13, and the arched notch 141 is used to ensure the rising flow of the oil to prevent the oil flow in the pipeline from becoming smaller, thereby effectively ensuring the normal transportation of the oil, without the need for frequent shutdown and cleaning, thereby improving work efficiency; in the degassing channel, only when the gas in the air intake sleeve 2 is greater than the sum of the gravity of the steel ball 17 and the atmospheric pressure, the gas will enter the pressure stabilizing sleeve 3, thereby ensuring the pressure between the inner tube 10 and the outer tube 1, so as to ensure that the oil passes through the multiple oil inlet holes 101 and enters the inner tube 10, further ensuring the normal transportation of the oil.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sand-proof oil-gas separator for a screw drill, characterized in that: It comprises an outer tube, an adapter sleeve, an inner tube, a sand filter assembly and an exhaust assembly; the inner tube is concentrically arranged inside the outer tube, the lower end of the adapter sleeve is sleeved and fixed on the outer side of the upper end of the inner tube and inserted into the inner side of the upper end of the outer tube, the exhaust assembly is arranged between the adapter sleeve and the outer tube, the sand filter assembly is arranged on the outer side of the lower part of the inner tube and inside the outer tube, the upper outer part of the inner tube is provided with a plurality of oil inlet hole units distributed at equal angles along the circumferential direction, the oil inlet hole unit comprises a plurality of vertically arranged oil inlet holes, the sand filter assembly comprises a first positioning sleeve, a guide sleeve, a distance sleeve, a sand filter plate, a second positioning sleeve, a plug and an isolation plate; the first positioning sleeve is sleeved and fixed on the outside of the inner tube and arranged below the plurality of oil inlet hole units, the second positioning sleeve is sleeved and fixed on the outside of the inner tube and arranged at Below the first positioning sleeve, a plurality of vertically arranged guide sleeves are provided between the first positioning sleeve and the second positioning sleeve, a distance sleeve is provided between any two adjacent guide sleeves, a spiral strip is formed outwardly on the outer side of the guide sleeve, two sand filter plates are fixedly provided on the outer side of the distance sleeve, an arched notch is formed on one side of the two sand filter plates, the arched notches on the two sand filter plates are arranged diagonally to each other, a plurality of sand filter holes are also provided in the sand filter plates, the isolation plate is transversely and sealingly fixed on the inner wall of the outer tube and provided below the inner tube, the plug is provided between the isolation plate and the inner tube, the upper end of the plug is inserted and fixed inside the lower end of the inner tube, the lower end of the plug is fixed on the isolation plate, and a plurality of isolation holes are provided in the isolation plate; The exhaust assembly includes a steel ball, an air inlet sleeve, a pressure stabilizing sleeve, a pressure equalizing sleeve and an air outlet sleeve, wherein the air inlet sleeve, the pressure stabilizing sleeve, the pressure equalizing sleeve and the air outlet sleeve are sequentially sleeved and fixed on the outside of the adapter sleeve from bottom to top, the upper end of the air inlet sleeve is provided with a first sink groove distributed in an annular direction, the lower end of the air inlet sleeve is provided with a plurality of first air inlet holes distributed at equal angles along the circumferential direction, and correspondingly, the lower end of the pressure stabilizing sleeve is provided with the same number of second air inlet holes, the plurality of second air inlet holes are respectively concentrically arranged with the plurality of first air inlet holes, the upper end of each of the first air inlet holes is interconnected with the bottom surface of the first sink groove, and the inner lower end of each of the second air inlet holes is provided with a steel ball; It also includes a transition pipe, an oil inlet nozzle and an oil outlet nozzle, the oil outlet nozzle is arranged above the adapter sleeve, the transition pipe is arranged between the oil outlet nozzle and the adapter sleeve, the upper and lower ends of the transition pipe are respectively inserted and fixed in the lower end of the oil outlet nozzle and the upper end of the adapter sleeve, the oil inlet nozzle is arranged below the outer tube, and the upper end of the oil inlet nozzle is inserted and fixed in the lower end of the outer tube.

2. The sand-proof oil-gas separator for a screw drill according to claim 1, characterized in that: A retaining ring is formed outwardly at the upper end of the first positioning sleeve, the outer edge of the retaining ring is sealed and fixed on the inner wall of the outer tube, and a plurality of liquid inlet notches are formed at the edge of the retaining ring.

3. The sand-proof oil-gas separator for a screw drill according to claim 1, characterized in that: The upper end of the pressure stabilizing sleeve is provided with a second groove distributed in an annular direction, and the second groove is connected to the upper end of each second air inlet hole, the width of the first groove is larger than the inner diameter of the first air inlet hole and smaller than the inner diameter of the second air inlet hole, and the width of the second groove is smaller than the inner diameter of the second air inlet hole.

4. The sand-proof oil-gas separator for a screw drill according to claim 3, characterized in that: The pressure equalizing sleeve is provided with a plurality of air holes distributed at equal angles along the circumferential direction, the lower end of each of the air holes is interconnected with the interior of the second groove, the inner diameter of the air holes is smaller than the width of the second groove, the lower end of the air outlet sleeve is provided with a third groove distributed circumferentially, the upper end of each of the air holes is interconnected with the interior of the third groove, the inner diameter of the air holes is smaller than the width of the third groove, and the outer inner wall of the third groove is provided with a plurality of air outlet holes distributed at equal angles along the circumferential direction.

5. The sand-proof oil-gas separator for a screw drill according to claim 4, characterized in that: An circumferentially distributed arc surface is formed inside the lower opening of the second air inlet hole, and the lower end of the steel ball is attached to the arc surface and cooperates with the upper opening of the first sink groove.

6. The sand-proof oil-gas separator for a screw drill according to claim 1, characterized in that: A convex sleeve is formed downwardly on the lower end edge of the air inlet sleeve, the convex sleeve is arranged on the outer side of the plurality of first air inlet holes, and the convex sleeve is inserted and fixed inside the upper end of the outer tube.

Images