A downhole air anchor device with adaptive capability

Abstract

The present invention relates to the field of oilfield development, and in particular to a self-adaptive downhole gas anchor comprising: an outer tube for introducing a gas-liquid mixed medium, including a gas anchor liquid inlet for providing a passage for the gas-liquid mixed medium to enter the outer tube; a gas-liquid separation mechanism for separating the gas and liquid in the gas-liquid mixed medium, including a spiral separation assembly for separating the gas and liquid by changing the flow direction of the gas-liquid mixed medium, and an adaptive sedimentation separation assembly disposed below the spiral separation assembly for determining the degree of gravity sedimentation separation of the gas-liquid mixed medium after spiral separation based on the weight of the gas-liquid mixed medium introduced by the outer tube; and an inner tube for discharging liquid after the gas-liquid mixed medium is separated by the gas-liquid separation mechanism. The present invention increases the liquid separation capability of the gas anchor and improves its operating efficiency.

Description

Technical Field

[0001] The present invention relates to the field of oil field development, in particular to a downhole gas anchor with self-adaptation capability. Background Art

[0002] According to existing technologies, as oilfield development continues, the gas content of oil wells will gradually increase, and the rising gas-liquid ratio will become an irreversible trend. As the gas-liquid ratio increases, on the one hand, gas will enter the oil well pump, occupying the liquid volume and reducing the pump's performance; on the other hand, gas will gradually accumulate inside the oil well pump, preventing the floating valve from opening normally, forming a "gas lock" phenomenon, which makes the oil well pump unable to operate normally, affecting continuous production and reducing the liquid production of the oil well. Currently, the following two methods are mainly used to prevent gas lock in oil well pumps: one is to develop an oil well pump that can prevent gas lock, allowing gas to be discharged freely; the other is to use high-efficiency downhole gas anchors to separate gas and liquid at the pump inlet, reducing the volume of gas entering the oil well pump. To this end, an adaptive downhole gas anchor was invented and applied to high gas-liquid ratio oil wells under gas drive and other displacement methods. Through the special gas anchor structure, the gas anchor can self-adjust its gas-liquid separation capacity according to the liquid production, maintain the efficient operation of the gas anchor, reduce the inlet gas volume of the oil pump, improve the pump efficiency, and maintain the normal production of the oil well.

[0003] Chinese Patent Publication No.: CN102704907A discloses a gas anchor for an oil pumping well, including an upper joint, a diverter joint, an oil outlet pipe, an outer tube, a lower joint, an exhaust valve ball, and a mixed liquid inlet pipe. An outer connecting groove is opened on the side of the upper part of the outer tube, an inner connecting groove is opened on the side of the diverter joint, the diverter joint is fixed in the upper part of the outer tube, the inner connecting groove is aligned with the outer connecting groove, the upper part of the outer tube is connected to the lower part of the upper joint, the upper joint is a hollow structure, an inner screw is provided on the upper part of the upper joint, an oil outlet eccentric hole and an exhaust eccentric hole are provided in the diverter joint, the exhaust eccentric hole is connected to the inner connecting groove and the outer connecting groove, an exhaust valve ball is placed in the exhaust eccentric hole, and the exhaust valve ball is placed in the exhaust valve ball. The channel formed by the exhaust eccentric hole, the inner connecting groove and the outer connecting groove is connected in one direction. The upper end of the oil outlet pipe is installed in the oil outlet eccentric hole of the diverter joint and fixed to the diverter joint as a whole. The oil outlet pipe is connected to the interior of the upper joint through the oil outlet eccentric hole. The oil outlet pipe is in the outer tube. The lower part of the mixed liquid inlet pipe is installed in the eccentric hole of the lower joint. The mixed liquid inlet pipe is connected to the lower part of the lower joint. The mixed liquid inlet pipe is inserted into the outer tube. The upper part of the lower joint is connected to the lower part of the outer tube. The oil outlet pipe and the mixed liquid inlet pipe are parallel in the outer tube, so that a flow channel is formed in the outer tube. The flow channel is connected to the lower part of the oil outlet pipe and the flow channel is connected to the upper part of the mixed liquid inlet pipe. It can be seen that the pumping well gas anchor has the problem that the liquid separation ability of the gas anchor is reduced due to insufficient gas-liquid separation, resulting in a reduced working efficiency of the gas anchor. Summary of the Invention

[0004] To this end, the present invention provides a downhole air anchor with self-adaptation capability to overcome the problem in the prior art that insufficient gas-liquid separation leads to a decrease in the liquid separation capability of the air anchor and a decrease in the working efficiency of the air anchor.

[0005] To achieve the above-mentioned object, the present invention provides a downhole air anchor with self-adaptability, comprising:

[0006] an outer tube for introducing a gas-liquid mixed medium, including a gas anchor liquid inlet for providing a passage for the gas-liquid mixed medium to enter the interior of the outer tube;

[0007] a gas-liquid separation mechanism connected to the outer tube for separating the gas and liquid in the gas-liquid mixed medium, comprising a forward spiral blade for changing the flow direction of the gas-liquid mixed medium to form a first-stage separated oil liquid, a reverse spiral blade disposed below the forward spiral blade for changing the flow direction of the first-stage separated oil liquid to form a second-stage separated oil liquid, and an adaptive sedimentation separation component disposed below the reverse spiral blade for changing the size of the gas-liquid separation space according to the weight of the gas-liquid mixed medium introduced into the outer tube to form a third-stage separated oil liquid;

[0008] The adaptive sedimentation separation component includes a movable baffle disposed below the reverse spiral blade for performing gravity sedimentation separation on the secondary separated oil to form a tertiary separated oil, and a sealing spring chamber disposed below the movable baffle for automatically adjusting the vertical distance from the lower end of the reverse spiral blade to the movable baffle according to the weight of the gas-liquid mixed medium.

[0009] An inner tube, which is movably connected to a portion of the gas-liquid separation mechanism and is used to discharge the liquid after the gas-liquid mixed medium is separated by the gas-liquid separation mechanism, includes an inner tube liquid inlet arranged above the adaptive sedimentation separation component to provide a channel for the three-stage separated oil outside the inner tube to enter the inner tube, and an inner tube outlet arranged above the positive spiral blade to provide an oil pumping position for the oil pump.

[0010] Furthermore, the acute angle between the blade root of the positive spiral blade and the horizontal direction is 25°, and the acute angle between the blade root of the negative spiral blade and the horizontal direction is 25°.

[0011] Furthermore, the sealing spring chamber comprises:

[0012] a spring assembly connected to the movable baffle, which changes the vertical position of the movable baffle to change the gravity settling space of the oil;

[0013] The sealing component is arranged outside the spring component and is used to seal the space where the spring is located.

[0014] Furthermore, it also includes a base connected to the spring assembly for supporting and fixing the spring assembly.

[0015] Furthermore, the spring assembly is fixedly connected to the movable baffle and the base respectively.

[0016] Furthermore, the spring assembly includes a plurality of springs that are arranged at equal intervals in the space between the inner tube and the outer tube according to the axis of the base.

[0017] Furthermore, the sealing assembly includes several layers of inner sealing members and outer sealing members.

[0018] Furthermore, the inner sealing members are arranged on the outer wall of the inner tube at equal intervals in the vertical direction, and the outer sealing members are arranged on the inner wall of the outer tube at equal intervals in the vertical direction.

[0019] Furthermore, the inner sealing member and the outer sealing member are both annular, the inner diameter of the inner sealing member is equal to the outer wall diameter of the inner tube, and the outer diameter of the outer sealing member is equal to the inner wall diameter of the outer tube.

[0020] Furthermore, when the weight of the gas-liquid mixed medium is greater than a preset weight, the movable baffle moves in a vertical downward direction as the spring assembly is compressed.

[0021] Furthermore, the movable baffle does not move when the weight of the gas-liquid mixed medium is less than the preset weight.

[0022] Furthermore, the preset weight is a ratio of the product of the spring coefficient of the spring assembly and the telescopic length of the spring assembly in the vertical direction after compression to the acceleration of gravity.

[0023] Furthermore, a vertical distance between the axis of the reverse spiral blade and the forward spiral blade is smaller than a vertical distance between the axis of the reverse spiral blade and the movable baffle.

[0024] Compared with the prior art, the beneficial effect of the present invention lies in that the system of the present invention is provided with an outer tube, an inner tube and a gas-liquid separation mechanism, and the gas-liquid mixed medium inside the oil well passes through positive spiral blades and reverse spiral blades with opposite rotation directions. The positive spiral blades are used to realize the swirl and acceleration of the gas-liquid mixed medium, and the primary separation of gas and liquid is carried out. The reverse spiral blades are used to realize the secondary separation of gas and liquid, and the gas-liquid mixed medium is decelerated. The vertical distance between the reverse spiral blades and the movable baffle is used to realize the tertiary separation of the gas-liquid mixed medium by gravity sedimentation. The gas-liquid mixed medium is fully separated by centrifugal force, inertial force and gravity. The movable baffle adaptively adjusts the gravity sedimentation height according to the gravity of the gas-liquid mixed medium, thereby increasing the gravity sedimentation effect, improving the working efficiency of the air anchor, and further increasing the gas-liquid separation capacity of the air anchor.

[0025] Furthermore, the system of the present invention sets an outer tube and an inner tube, and the gas-liquid mixed medium inside the oil well enters the annular space between the inner wall of the outer tube and the outer wall of the inner tube through the liquid inlet hole on the outer tube of the gas anchor, and the separated gas floats to the gas anchor liquid inlet and is discharged. The small amount of gas after three separations enters the inner tube through the gas-liquid port of the inner tube along with a large amount of liquid, and is supplied to the oil pump to be pumped to the inner tube outlet, thereby reducing the energy consumption of the oil pump and improving the gas-liquid separation efficiency.

[0026] Furthermore, the system of the present invention sets up a sealed spring chamber to perform a third gas-liquid separation on the gas-liquid mixed medium by its own gravity. When the gas-liquid mixed medium acts on the movable baffle by gravity, it will expand and contract, thereby driving the movable baffle to move up and down. By changing the vertical distance between the bottom of the anti-spiral blade and the movable baffle to adapt to the change in the processing volume of the gas-liquid mixed medium, the available space for the third gravity separation is increased, and the overall gas-liquid separation efficiency of the air anchor is further improved.

[0027] Furthermore, the system of the present invention sets a preset weight. Since the weight of the gas-liquid mixed medium entering the air anchor at a single time is different, when the weight of the gas-liquid mixed medium exceeds the preset weight, the gas-liquid separation efficiency of the original falling vertical space decreases. The movable baffle moves downward with the compression of the spring assembly in the sealing spring chamber, thereby increasing the vertical distance from the lower end of the anti-spiral blade to the movable baffle, and further enhancing the tertiary gravity sedimentation separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is an overall structural diagram of a downhole air anchor with self-adaptability according to an embodiment of the present invention;

[0029] Figure 2 This is a structural diagram of a well pump connection for a downhole air anchor with adaptive capability according to an embodiment of the present invention;

[0030] Figure 3 This is a block diagram of the overall structure of a downhole air anchor with self-adaptability according to an embodiment of the present invention;

[0031] Figure 4 This is a structural block diagram of a gas-liquid separation mechanism of a downhole gas anchor with self-adaptability according to an embodiment of the present invention;

[0032] Explanation of the accompanying numbers: 1-air anchor liquid inlet, 2-outer tube, 3-positive spiral blade, 4-reverse spiral blade, 5-inner tube, 6-inner tube liquid inlet, 7-movable baffle, 8-sealing assembly, 9-sealing spring chamber, 10-inner tube outlet, 11-base, 12-vibration sensor, 13-oil pump, 14-delivery pipeline, 15-flow valve, 16-pressure sensor, 17-pipeline vibration sensor. DETAILED DESCRIPTION

[0033] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0034] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0035] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0036] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0037] See also Figure 1 、 Figure 2 、 Figure 3 as well as Figure 4 As shown, they are respectively an overall structural diagram of a downhole air anchor with self-adaptability, a well pump connection structural diagram, an overall structural block diagram, and a gas-liquid separation mechanism structural block diagram according to an embodiment of the present invention.

[0038] Embodiment 1: Embodiment 1 of the present invention provides a downhole air anchor with self-adaptability, comprising:

[0039] The outer tube 2 is used to introduce the gas-liquid mixed medium, including a gas anchor liquid inlet 1 for providing a channel for the gas-liquid mixed medium to enter the inner part of the outer tube 2;

[0040] a gas-liquid separation mechanism connected to the outer tube 2 for separating the gas and liquid in the gas-liquid mixed medium, comprising a forward spiral blade 3 for changing the flow direction of the gas-liquid mixed medium to form a first-stage separated oil-liquid, a reverse spiral blade 4 disposed below the forward spiral blade 3 for changing the flow direction of the first-stage separated oil-liquid to form a second-stage separated oil-liquid, and an adaptive sedimentation separation component disposed below the reverse spiral blade 4 for changing the size of the gas-liquid separation space according to the weight of the gas-liquid mixed medium introduced into the outer tube 2 to form a third-stage separated oil-liquid;

[0041] The adaptive sedimentation separation component includes a movable baffle 7 disposed below the reverse spiral blade 4 for performing gravity sedimentation separation on the secondary separated oil to form a tertiary separated oil, and a sealing spring chamber 9 disposed below the movable baffle 7 for automatically adjusting the vertical distance from the lower end of the reverse spiral blade 4 to the movable baffle 7 according to the weight of the gas-liquid mixed medium.

[0042] The inner tube 5 is movably connected to a portion of the gas-liquid separation mechanism and is used to discharge the liquid after the gas-liquid mixed medium is separated by the gas-liquid separation mechanism. It includes an inner tube liquid inlet 6 arranged above the adaptive sedimentation separation component to provide a channel for the three-stage separated oil outside the inner tube 5 to enter the inner tube 5, and an inner tube outlet 10 arranged above the positive spiral blade 3 to provide an oil pumping position for the oil pump 13.

[0043] In practice, the working process of the system of the present invention is as follows: the gas-liquid mixed medium enters the outer tube 2 from the air anchor liquid inlet 1, flows through the positive spiral blade 3 to generate positive direction swirl and acceleration, flows through the reverse spiral blade 4 to generate reverse direction swirl and acceleration, settles by gravity to the movable baffle 7 in the outer tube 2, and then enters the inner tube 5 from the inner tube liquid inlet 6, is pumped by the oil pump 13 to the inner tube outlet 10 and flows out.

[0044] During implementation, the system of the present invention is provided with an outer tube 2, an inner tube 5 and a gas-liquid separation mechanism. The gas-liquid mixed medium inside the oil well passes through the positive spiral blades 3 and the reverse spiral blades 4 with opposite rotation directions. The positive spiral blades 3 are used to realize the swirl and acceleration of the gas-liquid mixed medium, and the initial gas-liquid separation is carried out. The reverse spiral blades 4 are used to realize the secondary gas-liquid separation and deceleration of the gas-liquid mixed medium. The vertical distance between the reverse spiral blades 4 and the movable baffle 7 is used to realize the tertiary separation of the gas-liquid mixed medium by gravity sedimentation. The gas-liquid mixed medium is fully separated by centrifugal force, inertial force and gravity, thereby improving the working efficiency of the air anchor and further increasing the gas-liquid separation capacity of the air anchor.

[0045] Specifically, the acute angle between the blade root of the positive spiral blade 3 and the horizontal direction is 25°, and the acute angle between the blade root of the reverse spiral blade 4 and the horizontal direction is 25°.

[0046] Specifically, the sealing spring chamber 9 includes:

[0047] a spring assembly connected to the movable baffle 7, which changes the vertical position of the movable baffle 7 to change the gravity settling space of the oil;

[0048] The sealing assembly 8 is arranged outside the spring assembly to seal the space where the spring is located.

[0049] Specifically, it also includes a base 11 connected to the spring assembly for supporting and fixing the spring assembly.

[0050] Specifically, the spring assembly is fixedly connected to the movable baffle 7 and the base 11 respectively.

[0051] In practice, the system of the present invention sets an outer tube 2 and an inner tube 5, and the gas-liquid mixed medium inside the oil well enters the annular space between the inner wall of the outer tube 2 and the outer wall of the inner tube 5 through the liquid inlet hole on the air anchor outer tube 2. The separated gas floats to the air anchor liquid inlet 1 and is discharged. A small amount of gas after three separations enters the interior of the inner tube 5 along with a large amount of liquid through the gas-liquid port of the inner tube 5, and is supplied to the oil pump 13 to be pumped to the inner tube outlet 10, thereby reducing the energy consumption of the oil pump 13 and improving the gas-liquid separation efficiency.

[0052] Specifically, the spring assembly includes a plurality of springs that are arranged at equal intervals in the space between the inner tube 5 and the outer tube 2 along the axis of the base 11 .

[0053] During implementation, the system of the present invention sets up a sealing spring chamber 9 to perform a third gas-liquid separation on the gas-liquid mixed medium by its own gravity. When the gas-liquid mixed medium acts on the movable baffle 7 by gravity, it will expand and contract, thereby driving the movable baffle 7 to move up and down. By changing the vertical distance between the bottom of the anti-spiral blade 4 and the movable baffle 7 to adapt to the change in the processing volume of the gas-liquid mixed medium, the available space for the third gravity separation is increased, and the overall gas-liquid separation efficiency of the air anchor is further improved.

[0054] Specifically, the sealing assembly 8 includes several layers of inner sealing members and outer sealing members.

[0055] Specifically, the inner sealing members are arranged on the outer wall of the inner tube 5 at equal intervals in the vertical direction, and the outer sealing members are arranged on the inner wall of the outer tube 2 at equal intervals in the vertical direction.

[0056] Specifically, the inner sealing member and the outer sealing member are both annular, the inner diameter of the inner sealing member is equal to the outer wall diameter of the inner tube 5 , and the outer diameter of the outer sealing member is equal to the inner wall diameter of the outer tube 2 .

[0057] Specifically, seals are made of rubber, PTFE, metal and composite materials.

[0058] Specifically, when the weight of the gas-liquid mixed medium is greater than a preset weight, the movable baffle moves in a vertical downward direction as the spring assembly is compressed.

[0059] Specifically, the preset weight is a ratio of the product of the spring coefficient of the spring assembly and the extension length of the spring assembly in the vertical direction after compression to the acceleration of gravity.

[0060] In an implementation, for example, the spring constant of the spring assembly is 400 N / m, the movement distance of the spring assembly after compression is 0.05 meters, and the preset weight is 2.04 kg.

[0061] Specifically, a vertical distance between the axis of the reverse spiral blade 4 and the forward spiral blade 3 is smaller than a vertical distance between the axis of the reverse spiral blade 4 and the movable baffle 7 .

[0062] In practice, the system of the present invention sets a preset weight. Since the weight of the gas-liquid mixed medium entering the air anchor at a single time is different, when the weight of the gas-liquid mixed medium exceeds the preset weight, the gas-liquid separation efficiency of the original falling vertical space decreases. The movable baffle 77 moves downward with the compression of the spring assembly in the sealing spring chamber 99, thereby increasing the vertical distance from the lower end of the anti-spiral blade 44 to the movable baffle 77, and further enhancing the three-way gravity sedimentation separation effect.

[0063] Example 2. Example 2 of the present invention is further provided with an oil pump 13, a delivery mechanism, a detection mechanism and a controller on the basis of Example 1. The delivery mechanism includes a delivery pipeline 14 for delivering oil to the oil pump and a flow valve 15 connected to the delivery pipeline 14 for controlling the flow of the three-stage separated oil output by the inner tube to the delivery pipeline 14; the detection mechanism includes a vibration sensor 12 connected to the gas-liquid separation mechanism for detecting the vibration frequency of the movable baffle, a pipeline connected to the delivery pipeline 14 for detecting the vibration frequency of the delivery pipeline 14. A vibration sensor 17 and a pressure sensor 16 connected to the delivery pipeline 14 for detecting the oil pressure of the three-stage separated oil in the delivery pipeline 14, and a controller respectively connected to the outer tube 2 and the gas-liquid separation mechanism, for determining whether the stability of the gas-liquid separation meets the requirements according to the vibration frequency of the movable baffle 7, and when it is determined that it does not meet the requirements, adjusting the pumping speed of the oil pump 13 and issuing a damage warning to the positive spiral blades 3 and the reverse spiral blades 4, or adjusting the minimum opening pressure of the flow valve 15 according to the vibration frequency of the delivery pipeline 14.

[0064] Specifically, the inner tube 5 and the oil well pump 13 are connected by a delivery pipeline 14 , and a flow valve 15 and a pipeline vibration sensor 17 are provided on the delivery pipeline 14 .

[0065] Specifically, the pressure sensor 16 is provided between the flow valve 15 and the inner tube outlet 10 .

[0066] Specifically, a vibration sensor 12 is provided below the movable baffle 7 to detect the vibration frequency of the movable baffle 7 .

[0067] Specifically, the vibration sensor 12 and the pipeline vibration sensor 17 are piezoelectric crystals or accelerometers.

[0068] Specifically, the controller is a PLC controller.

[0069] Specifically, the controller is connected to the vibration sensor 12 and the oil pump 13 respectively to obtain the single vibration frequency of the movable baffle 7. If the single vibration frequency of the movable baffle 7 is greater than the preset second vibration frequency, the oil pumping speed of the oil pump 13 is increased.

[0070] Specifically, the increase range of the oil pumping speed of the oil pump 13 is determined according to the difference between the single vibration frequency of the movable baffle 7 and the preset vibration frequency.

[0071] In implementation, the general value range of the preset second vibration frequency is [12 Hz, 16 Hz].

[0072] Preferably, the preferred embodiment of the preset second vibration frequency is 14 Hz.

[0073] Specifically, when the difference between the single vibration frequency of the movable baffle 7 and the preset vibration frequency is within 2Hz, the pumping speed of the oil pump 13 increases by 20L / min; when the difference between the single vibration frequency of the movable baffle 7 and the preset vibration frequency exceeds 2Hz, the pumping speed of the oil pump 13 increases by 15L / min for every 1Hz exceeding it. For example, the single vibration frequency of the movable baffle 7 is 18Hz. Currently, the pumping speed of the oil pump 13 is 400L / min, and the pumping speed of the oil pump 13 increases to 400L / min+20L / min+15L / min×2=450L / min.

[0074] Specifically, the controller is also used to determine whether there is damage in the positive spiral blade 3 and the reverse spiral blade 4 when the single vibration frequency of the movable baffle is greater than the preset first vibration frequency, and to issue a damage warning.

[0075] In implementation, the general value range of the preset first vibration frequency is [8 Hz, 10 Hz].

[0076] Preferably, the preset first vibration frequency is 8.5 Hz.

[0077] During implementation, by setting a damage warning, the vertical flow velocity or rotational flow velocity of the liquid entering the air anchor is accelerated due to damage or bending in the positive spiral blades 3 and the reverse spiral blades 4, which in turn causes the flow velocity of the oil at the bottom to be unstable or may steadily increase, causing the vibration frequency of the movable baffle 7 to increase, affecting the separation interface between the oil and gas, causing the separated gas to be re-mixed into the oil, reducing the separation efficiency, and reducing the contact time of the oil and gas at the separation interface by increasing the pumping speed of the oil pump 13. At the same time, when the vibration of the movable baffle 7 is too severe, it will cause the wear of the mechanical parts in the sedimentation equipment to increase, thereby affecting the normal operation and separation effect of the equipment.

[0078] Specifically, the controller is connected to the flow valve 15 , the pressure sensor 16 and the pipeline vibration sensor 17 , and is used to increase the minimum opening pressure of the flow valve 15 when the vibration frequency of the delivery pipeline 14 is greater than the preset pipeline vibration frequency.

[0079] In practice, the general range of the preset pipeline vibration frequency is [800Hz, 1200Hz].

[0080] Preferably, the preset pipeline vibration frequency is 1000 Hz.

[0081] Specifically, when the vibration frequency of the delivery pipeline 14 and the preset pipeline vibration frequency are within 100 Hz, the minimum opening pressure of the flow valve 15 increases to 1.05 times the original value; when the vibration frequency of the delivery pipeline 14 and the preset pipeline vibration frequency exceed 100 Hz, the minimum opening pressure of the flow valve 15 increases by 10 kPa for every 100 Hz exceeding. For example, the vibration frequency of the delivery pipeline 14 is 1200 Hz. Currently, the minimum opening pressure of the flow valve 15 is 400 kPa, and the minimum opening pressure of the flow valve 15 increases to 400 kPa×1.05+10 kPa=430 kPa.

[0082] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A downhole air anchor device with self-adaptability, characterized in that: include: an outer tube for introducing a gas-liquid mixed medium, including a gas anchor liquid inlet for providing a passage for the gas-liquid mixed medium to enter the interior of the outer tube; a gas-liquid separation mechanism connected to the outer tube for separating the gas and liquid in the gas-liquid mixed medium, comprising a forward spiral blade for changing the flow direction of the gas-liquid mixed medium to form a first-stage separated oil liquid, a reverse spiral blade disposed below the forward spiral blade for changing the flow direction of the first-stage separated oil liquid to form a second-stage separated oil liquid, and an adaptive sedimentation separation component disposed below the reverse spiral blade for changing the size of the gas-liquid separation space according to the weight of the gas-liquid mixed medium introduced into the outer tube to form a third-stage separated oil liquid; The adaptive sedimentation separation component includes a movable baffle disposed below the reverse spiral blade for performing gravity sedimentation separation on the secondary separated oil to form a tertiary separated oil, and a sealing spring chamber disposed below the movable baffle for automatically adjusting the vertical distance from the lower end of the reverse spiral blade to the movable baffle according to the weight of the gas-liquid mixed medium. An inner tube, which is movably connected to a portion of the gas-liquid separation mechanism and is used to discharge the liquid after the gas-liquid mixed medium is separated by the gas-liquid separation mechanism, includes an inner tube liquid inlet arranged above the adaptive sedimentation separation component to provide a channel for the three-stage separated oil outside the inner tube to enter the inner tube, and an inner tube outlet arranged above the positive spiral blade to provide an oil pumping position for the oil pump.

2. The downhole air anchor device with self-adaptability according to claim 1, characterized in that: The acute angle between the blade root of the positive spiral blade and the horizontal direction is 25°, and the acute angle between the blade root of the reverse spiral blade and the horizontal direction is 25°.

3. The downhole air anchor device with self-adaptability according to claim 2, characterized in that: The sealing spring chamber comprises: a spring assembly connected to the movable baffle, which changes the vertical position of the movable baffle to change the gravity settling space of the oil; The sealing component is arranged outside the spring component and is used to seal the space where the spring is located.

4. The downhole air anchor device with self-adaptability according to claim 3, characterized in that: It also includes a base connected to the spring assembly for supporting and fixing the spring assembly.

5. The downhole air anchor device with self-adaptability according to claim 4, characterized in that: The spring assembly is fixedly connected to the movable baffle and the base respectively.

6. The downhole air anchor device with self-adaptability according to claim 5, characterized in that: The spring assembly includes a plurality of springs which are arranged at equal intervals in the space between the inner tube and the outer tube according to the axis of the base.

7. The downhole air anchor device with self-adaptability according to claim 6, characterized in that: The sealing assembly includes several layers of inner sealing elements and outer sealing elements.

8. The downhole air anchor device with self-adaptability according to claim 7, characterized in that: The inner sealing members are arranged on the outer wall of the inner tube at equal intervals in the vertical direction, and the outer sealing members are arranged on the inner wall of the outer tube at equal intervals in the vertical direction.

9. The downhole air anchor device with self-adaptability according to claim 8, characterized in that: The inner sealing member and the outer sealing member are both annular, the inner diameter of the inner sealing member is equal to the outer wall diameter of the inner tube, and the outer diameter of the outer sealing member is equal to the inner wall diameter of the outer tube.

10. The downhole air anchor device with self-adaptability according to claim 9, characterized in that: When the weight of the gas-liquid mixed medium is greater than a preset weight, the movable baffle moves in a vertical downward direction as the spring assembly is compressed.

11. The downhole air anchor device with self-adaptability according to claim 10, characterized in that: The movable baffle does not move when the weight of the gas-liquid mixed medium is less than the preset weight.

12. The downhole air anchor device with self-adaptability according to claim 11, characterized in that: The preset weight is a ratio of the product of the spring coefficient of the spring assembly and the telescopic length of the spring assembly in the vertical direction after compression to the acceleration of gravity.

13. The downhole air anchor device with self-adaptability according to claim 12, characterized in that: The vertical distance between the axis of the reverse spiral blade and the forward spiral blade is smaller than the vertical distance between the axis of the reverse spiral blade and the movable baffle.

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