Autorotation double-helix sand setting gas anchor

Abstract

The utility model relates to the technical field of oil extraction, in particular to an automatic rotating double-helix sand setting gas anchor. Comprising an upper connector, an outer pipe fixedly sealed at the lower end of the upper connector, a lower connector fixedly sealed at the lower end of the outer pipe, a tail pipe fixedly sealed at the lower end of the lower connector, a sealing plug at the lower end of the tail pipe, a plurality of outer inlet holes formed in the upper portion of the outer pipe, an inner pipe concentrically and rotatably arranged in the outer pipe, and an exhaust port formed in the upper connector and communicated with an annular space between the inner pipe and the outer pipe. A plurality of inner inlet holes are formed in the lower portion of the inner pipe, an upper spiral piece and a lower spiral piece are fixed to the outer side of the inner pipe, the screw pitch of the upper spiral piece is larger than that of the lower spiral piece, and the spiral directions of the upper spiral piece and the lower spiral piece are the same. By means of the collaborative design of the upper spiral piece and the lower spiral piece, segmented acceleration and centrifugal separation of gas-liquid two-phase flow are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of oil production, in particular to automatic rotation double helix sand setting gas anchor. BACKGROUND

[0002] In the process of oil exploitation, well fluid is often accompanied by a large amount of gas, which directly affects the oil production efficiency and the cost of later processing. In the exploitation link, the presence of gas will cause "gas locking effect", and the gas accumulation in the wellbore will make the oil pump unable to effectively suck the well fluid, resulting in a decrease in pump efficiency. In the later processing of well fluid, a gas-liquid separator needs to be equipped, which increases equipment investment and energy consumption. At the same time, in the process of well fluid transportation, sulfur-containing gas in associated gas will cause "sulfide stress corrosion of equipment", which shortens the service life of the pipeline, and gas resistance is also easy to form in the oil pipeline, resulting in a decrease in pipeline transportation efficiency.

[0003] The oilfield well fluid lifting equipment is mainly a plunger type oil pump. When the oil pump works in the well, it sucks the mixed liquid of gas, oil and water. For the development of oilfield unconsolidated sandstone reservoir, there are also a considerable amount of sand and other impurities in the mixed liquid sucked in the process of using the oil pump. For the oil pump, the gas entering the pump will reduce the pump efficiency and affect the yield; the sand entering the pump will not only accelerate the wear of the oil pump, but also will cause the oil pump to be stuck and unable to work in severe cases. In order to solve the above problems of sand and gas entering the oil pump, a sand setting gas anchor (also known as a gas sand anchor) is usually used to separate gas, liquid and sand particles from the mixed liquid, so it is necessary to provide an automatic rotation double helix sand setting gas anchor.

[0004] The patent document with publication number CN210440019U discloses a sedimentation type gas anchor device for oil well of oil field. When the gas anchor device sinks into the oil well, the oil liquid in the oil well first passes through the sand prevention assembly to discharge sand, and then falls into the sedimentation cup from top to bottom and enters the center pipe through the liquid inlet hole. Under the action of the suction force of the oil pump on the center pipe, the oil liquid in the center pipe flows to the spiral rod in the outer sleeve pipe, and under the action of the centrifugal force of the spiral body, the gas in the oil liquid is separated from the liquid. The separated gas flows into the gas hole from bottom to top and accumulates in the center hole, and then flows out from the gas outlet hole. The separated liquid flows upward in the cavity between the outer sleeve pipe and the spiral rod, and then is discharged from the liquid outlet hole 1, thereby achieving the effect of rapidly separating gas and oil. In the technical scheme, the sand particles in the oil liquid are easy to enter the oil pump, and the wear problem of the oil pump is serious. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a sand setting gas anchor which can effectively separate gas and sand particles in oil liquid.

[0006] In order to achieve the above purpose, the technical scheme provided by the utility model is:

[0007] The utility model provides an automatic rotation double helix sand gas anchor, including upper joint, the lower end of upper joint is fixedly sealed with outer tube, the lower end of outer tube is fixedly sealed with lower joint, the lower end of lower joint is fixedly sealed with tail pipe, the lower end of tail pipe is sealed and is blocked, a plurality of outer inlet holes are set up in the upper portion of outer tube, the concentric rotation of inner tube is arranged in outer tube, the exhaust port that is communicated with the annular space between inner tube and outer tube is set up on the upper joint, a plurality of inner inlet holes are set up in the lower portion of inner tube, and the upper spiral piece and lower spiral piece are fixed on the outside of inner tube, and the pitch of upper spiral piece is greater than the pitch of lower spiral piece

[0008] Specifically, the spiral directions of the upper spiral piece and the lower spiral piece are the same.

[0009] Specifically, the lower end of the upper spiral piece and the upper end of the lower spiral piece are smoothly connected.

[0010] Specifically, a plurality of blades are fixed on the inner wall of the inner tube above the inner inlet hole, and the plurality of blades are helically arrayed on the inner wall of the inner tube.

[0011] Specifically, the upper end of the inner tube is rotatably connected to the upper joint through an upper bearing, and the lower end of the inner tube is rotatably connected to the lower joint through a lower bearing.

[0012] Specifically, the upper bearing and the lower bearing are waterproof bearings.

[0013] Specifically, a central tube is arranged in the inner tube, an annular cavity is arranged between the outer wall of the central tube and the inner wall of the inner tube, the inner inlet hole is communicated with the central tube through a communication tube, and the communication tube is fixedly and sealingly connected with the central tube and the inner tube.

[0014] Specifically, the plurality of blades are located above the central tube.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] 1. By the cooperative design of the upper spiral piece and the lower spiral piece, the segmented acceleration and centrifugal separation of gas-liquid two-phase flow are realized. The upper spiral piece has a larger pitch to reduce fluid resistance and allow high-flow well fluid to enter quickly and preliminarily separate gas. The lower spiral piece has a smaller pitch to increase flow rate and centrifugal force intensity and strengthen the separation of small gas bubbles. The spiral directions of the upper spiral piece and the lower spiral piece are consistent and smoothly transitioned, reducing fluid disturbance, avoiding secondary mixing of gas, and ensuring the continuity of the separation process.

[0017] 2. The inner tube is freely rotatable through the upper bearing and the lower bearing, and forms a sand particle dynamic separation system in combination with the spiral array blades. The flow of well fluid drives the rotation of the inner tube, forcing the sand particles in the well fluid in the inner tube to gather towards the tube wall. The sand particles descend along the inner wall to the tail pipe, avoiding entering the oil pump. The independent flow channel design of the central tube and the communication tube isolates the upward flow of liquid and the settled sand particles, eliminating motion interference.

[0018] 3. The well fluid enters the annular space between the outer and inner tubes through the external inlet. Due to the density difference, the gas naturally rises to the vent and is discharged. The well fluid passes through the upper and lower spiral blades, where the remaining gas is separated by centrifugal force. The rotating blades further enhance the centrifugal separation, ensuring that residual sand particles settle completely.

[0019] 4. The central tube and connecting tube guide the clean fluid flow and the sand-containing fluid flow to separate into layers, reducing component wear.

[0020] 5. The staggered layout of the external and internal inlets increases the gas-liquid contact time through the baffle effect, promoting gas precipitation. The annular space connecting the external and internal pipes at the exhaust port forms a dedicated gas escape channel, reducing the risk of gas lock.

[0021] 6. The pitch of the upper spiral blade is greater than that of the lower spiral blade, which adapts to the flow characteristics of well fluids with different viscosities and expands the scope of application. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the present invention.

[0023] Figure 2 This is a schematic diagram showing the connection between the central tube and the inner tube.

[0024] The parts in the attached diagram are named as follows: 1. Upper connector, 2. Upper bearing, 3. Outer tube, 4. Inner tube, 5. Upper spiral blade, 6. Lower spiral blade, 7. Lower connector, 8. Lower bearing, 9. Tail tube, 10. Exhaust port, 11. Outer inlet hole, 12. Inner inlet hole, 13. Connecting pipe, 14. Central tube, 15. Blade. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Example 1: Refer to Figure 1 and Figure 2 As shown, the automatic rotating double helix sand-sinking air anchor includes an upper connector 1, an outer tube 3 fixedly sealed at the lower end of the upper connector 1, a lower connector 7 fixedly sealed at the lower end of the outer tube 3, a tail tube 9 fixedly sealed at the lower end of the lower connector 7, and a sealing plug at the lower end of the tail tube 9. Multiple external inlet holes 11 are opened on the upper part of the outer tube 3.

[0027] An inner tube 4 is concentrically rotatably mounted inside the outer tube 3. Specifically, the upper end of the inner tube 4 is rotatably connected to the upper connector 1 via an upper bearing 2, and the lower end of the inner tube 4 is rotatably connected to the lower connector 7 via a lower bearing 8. Both the upper bearing 2 and the lower bearing 8 are waterproof bearings. An exhaust port 10 is provided on the upper connector 1, communicating with the annular space between the inner tube 4 and the outer tube 3. Multiple internal inlet holes 12 are provided at the lower part of the inner tube 4.

[0028] The inner tube 4 is fixed with an upper helical blade 5 and a lower helical blade 6, the pitch of the upper helical blade 5 is larger than that of the lower helical blade 6, the helical directions of the upper helical blade 5 and the lower helical blade 6 are the same, and the lower end of the upper helical blade 5 and the upper end of the lower helical blade 6 are smoothly connected.

[0029] In operation, under the pumping action of the oil pump, the well fluid is sucked into the outer inlet hole 11, the well fluid enters the lower helical channel of the lower helical blade 6 through the upper helical channel of the upper helical blade 5, and then enters the inner tube 4 through the inner inlet hole 12, and the well fluid continues to be pumped into the ground oil pipeline by the oil pump. The sand particles contained in the well fluid will sink into the tail pipe 9 when passing through the inner tube 4 due to the large gravity, preventing the sand particles from wearing the oil pump.

[0030] When the well fluid flows through the upper helical channel and the lower helical channel, it drives the inner tube 4 to rotate, and the well fluid separates from the gas under the action of centrifugal force, and the gas can rise and be discharged through the gas outlet 10. The pitch of the upper helical blade 5 is large, which is beneficial to the passage of the well fluid, and the pitch of the lower helical blade 6 is small, which increases the flow rate of the well fluid when passing through the lower helical channel, which is beneficial to the rapid separation of the well fluid and the gas.

[0031] When the well fluid enters the annular cavity between the outer tube 3 and the inner tube 4 through the outer inlet hole 11 and flows downward, part of the gas in the well fluid can be precipitated, and when the well fluid enters the inner tube 4 through the inner inlet hole 12 and flows upward, part of the gas in the well fluid can be precipitated. By changing the direction of the well fluid, the gas-liquid separation effect can be improved.

[0032] Example two: based on example one, referring to Figure 1 and Figure 2 a plurality of blades 15 are fixed on the inner wall of the inner tube 4 above the inner inlet hole 12, and the plurality of blades 15 are helically arranged on the inner wall of the inner tube 4.

[0033] When the inner tube 4 rotates, the plurality of blades 15 can drive the well fluid in the inner tube 4 to rotate, and after the well fluid rotates, the sand particles in the well fluid are close to the inner wall of the inner tube 4 under the action of centrifugal force. In the process of rotating upward, the sand particles close to the inner wall of the inner tube 4 fall into the tail pipe 9 under the action of gravity. The rotation of the inner tube 4 drives the well fluid in the inner tube 4 to rotate, which can make the sand particles in the well fluid in the inner tube 4 gather and fall downward, improving the separation effect of the sand particles and the well fluid.

[0034] Example three: based on example two, referring to Figure 1 and Figure 2 a central tube 14 is arranged in the inner tube 4, and the plurality of blades 15 are located above the central tube 14. An annular cavity is arranged between the outer wall of the central tube 14 and the inner wall of the inner tube 4, the inner inlet hole 12 is communicated with the central tube 14 through the communication tube 13, and the communication tube 13 is fixedly and sealingly connected with the central tube 14 and the inner tube 4.

[0035] Since the well fluid between the outer tube 3 and the inner tube 4 continuously enters the inner tube 4, the sand particles in the inner tube 4 are easily impacted by the well fluid entering the inner tube 4 during the downward movement of the sand particles in the inner tube 4, thereby reducing the separation efficiency of the sand particles and the well fluid. Therefore, the central tube 14 and the communication tube 13 are provided in the embodiment.

[0036] When the inner tube 4 rotates, the well fluid in the inner tube 4 is rotated by the plurality of blades 15, which can make the sand particles in the well fluid in the inner tube 4 gather and then move downward, enter the liquid inlet hole 12, and then move upward through the communication tube 13 and the central tube 14. Therefore, the motion interference with the downward sand particles can be avoided, and the separation efficiency of the sand particles and the well fluid can be improved.

[0037] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An automatic rotating double helix grit air anchor, comprising an upper joint (1), the lower end of the upper joint (1) being fixedly sealed with an outer pipe (3), the lower end of the outer pipe (3) being fixedly sealed with a lower joint (7), the lower end of the lower joint (7) being fixedly sealed with a tail pipe (9), and the lower end of the tail pipe (9) being sealed and blocked, characterized in that, A plurality of outer inlets (11) are formed in the upper part of the outer tube (3), and the inner tube (4) is arranged concentrically and rotatably in the outer tube (3), the upper joint (1) is provided with an exhaust port (10) which is in communication with the annular space between the inner tube (4) and the outer tube (3), a plurality of inner inlets (12) are formed in the lower part of the inner tube (4), the upper spiral blade (5) and the lower spiral blade (6) are fixed to the outer side of the inner tube (4), the pitch of the upper spiral blade (5) is greater than that of the lower spiral blade (6), and the spiral directions of the upper spiral blade (5) and the lower spiral blade (6) are the same.

2. The self-rotating twin-screw grit-laden air anchor of claim 1, wherein, The lower end of the upper spiral blade (5) and the upper end of the lower spiral blade (6) are smoothly and transitionally connected.

3. The self-rotating twin-screw grit trap air anchor of claim 1, wherein, A plurality of blades (15) are fixed to the inner wall of the inner tube (4) above the inner inlets (12), and the plurality of blades (15) are arranged in a spiral array on the inner wall of the inner tube (4).

4. The self-rotating twin-screw grit-laden air anchor of claim 1, wherein, The upper end of the inner tube (4) is rotatably connected to the upper joint (1) through the upper bearing (2), and the lower end of the inner tube (4) is rotatably connected to the lower joint (7) through the lower bearing (8).

5. The self-rotating twin-screw grit trap air anchor of claim 4, wherein, The upper bearing (2) and the lower bearing (8) are waterproof bearings.

6. The self-rotating twin-screw grit trap air anchor of claim 4, wherein, A central tube (14) is arranged in the inner tube (4), an annular cavity is arranged between the outer wall of the central tube (14) and the inner wall of the inner tube (4), the inner inlets (12) are in communication with the central tube (14) through the communication tube (13), and the communication tube (13) is fixedly and sealingly connected with the central tube (14) and the inner tube (4).

7. The self-rotating twin-screw grit-laden air anchor of claim 3, wherein, The plurality of blades (15) are located above the central tube (14).

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