An anti-stuck pumping aid used in oil pipes

Abstract

The utility model discloses an anti-stuck auxiliary pumping device used in an oil pipe, which relates to the field of oil production tools, and comprises a main rod and an upper straightening block and a lower straightening block arranged on the main rod and fixedly connected to the main rod, and a sealing device which can move between the upper straightening block and the lower straightening block along the main rod; the sealing device comprises, from top to bottom, a short plunger, a sealing rubber cylinder and an annular plunger which are fixedly connected in sequence, and a certain gap is arranged between the central holes in the axial direction of the three and the outer peripheral surface of the main rod, and the gap is a flow passage; a truncated cone-shaped sealing block which is thin on the top and thick on the bottom is fixed on the lower straightening block; after the annular plunger is sealed on the lower straightening block, the inner wall of the annular plunger is affixed to the outer peripheral surface of the sealing block and the flow passage of the annular plunger is blocked and sealed; a plurality of expansion sheets are arranged on the outer peripheral surface of the sealing rubber cylinder; the splicing plate is affixed to the outer peripheral surface of the sealing rubber cylinder by extrusion; the beneficial effect is that the expansion sheet is radially expandable to prevent sand particles from getting stuck in the sealing rubber cylinder.

Description

Technical Field

[0001] The utility model relates to the technical field of oil extraction tools, in particular to an anti-stuck extraction aid used in an oil pipe. Background Art

[0002] The oil pump in the traditional lifting process is directly connected to the sucker rod, including rolling valve, oil pump plunger, pump barrel, pump fixed valve, etc. The above ordinary oil pumps are prone to sand jamming and well shutdown when encountering sand producing wells, resulting in low production capacity. There are currently three solutions:

[0003] One is to use an anti-sand-stuck oil pump to solve the above problem. For example, patent number: ZL02230155.0 discloses an anti-sand-stuck oil pump, which is composed of a pump barrel, a plunger, a pump valve, and an outer tube. When the oil pump is working and the upward stroke occurs, the pump rod drives the pump barrel plunger to move upward. At this time, the inner plunger pump valve opens, the pump and cylinder plunger pump valves close, and the crude oil enters the upper cavity of the pump barrel plunger through the inner plunger pump valve, and enters the annular space between the pump cylinder and the inner plunger through the side oil hole at the lower end of the inner plunger. During the downward stroke, the pump cylinder plunger moves downward, the pump barrel plunger pump valve opens, the inner plunger pump valve closes, and the crude oil in the upper cavity of the pump cylinder plunger is discharged into the upper cavity of the pump barrel by the pump cylinder plunger pump valve, and the crude oil in the lower annular space of the pump barrel plunger is discharged back to the inner plunger through the oil hole at the lower end of the inner plunger. Therefore, a hydraulic feedback force is generated in the process of sucking and discharging oil in the lower annular space of the pump barrel plunger, which can cause the pump cylinder plunger to move downward. Therefore, the pump can be applied to the general heavy oil well exploitation. During the down stroke, the sand on the pump barrel plunger is scraped off by the conical surface on the upper straightening joint, and the sand particles fall along the conical surface on the upper end of the outer pump barrel into the sand settling cavity in the annular space between the pump barrel and the outer tube, which will not cause sand to bury the plunger or jam the pump.

[0004] The second is to solve the above problem through a special sand control device. For example, Patent No.: ZL201510303039.5 discloses a sand control device, including: an outer tube, an inner tube and a sand control joint. The invention sets a first accommodating chamber between the inner tube and the outer tube, and sets a second accommodating chamber between the inner tube and the sucker rod, so that the first accommodating chamber is connected with the oil production pipe, and the second accommodating chamber is connected with the oil outlet of the oil pump, and a sand control joint is set at the second end of the inner tube, so that when the screw oil pump stops working, the mud and sand in the crude oil in the oil production pipe sinks to the sand control device, and is blocked by the sand control joint. Most of the mud and sand will sink into the first accommodating chamber of the sand prevention device and will not enter the second accommodating chamber of the inner tube, that is, will not enter the screw oil pump connected to the second accommodating chamber. Therefore, the sand prevention device provided in the embodiment of the invention can prevent all the mud and sand deposited in the oil production pipe from entering the screw oil pump when the screw oil pump stops working, that is, it can prevent a large amount of mud and sand from entering the rotor of the screw oil pump, causing the rotor to be stuck, so that the screw oil pump can be started again, reducing the maintenance frequency of the screw oil pump and improving the working efficiency of the screw oil pump.

[0005] The third is to solve the above problems through pumping aids. Pumping aids are a kind of mining tool that uses several pumping aids in series in the well to complete the lifting process during the mechanical oil production process. Pumping aids are short plungers with a one-way valve. When in use, they are connected in series to the sucker rod, and the tubing string is used as a pump barrel to form a large-clearance "oil well relay pump" that matches multiple short plungers and tubing strings. Pumping aids (or lifters or liquid lifters) replace traditional sand-proof screens and oil pumps to achieve oil extraction. After installing the pumping aid, there is no need to install sand-proof screens or use oil pumps. In addition, during well repair operations, you only need to pull out the sucker rod and replace the pumping aid to complete the well repair operation. The structure is simple, the design is reasonable, and it is efficient and safe. There are several such products on the market. For example, Patent No.: 202121551986.3 discloses a sand-preventing liquid lifter, Patent No.: 200920174333.0 discloses a serial pump liquid lifter, and Patent No.: 201420550082.2 discloses a serial liquid lifter.

[0006] At present, the pumping aids on the market are of various forms, with different and complex structures, and there is still sand jamming. For this reason, a pumping aid with a simple structure and good sand prevention effect is newly developed. Summary of the invention

[0007] The purpose of the utility model is to provide a pumping aid which is connected in series on a sucker rod, installed in an oil pipe, and constitutes a multi-stage "relay pump" with the sucker pipe to form a multi-stage lifting and oil extraction and cut off the sand layer, thereby reducing the load on the sucker pump, effectively extending the service life and pump inspection cycle of the sucker pump, and reducing the effect of sand jam.

[0008] The technical solution of the utility model is:

[0009] An anti-stuck pumping aid used in an oil pipe comprises a main rod and an upper straightening block, a setting device and a lower straightening block arranged on the main rod in sequence from top to bottom;

[0010] Further, both ends of the main rod are provided with external threads, and the two external thread sections are respectively an upper joint and a lower joint, both of which are used to connect with the sucker rod; before being connected with the sucker rod, the upper joint and the lower joint are both provided with protective caps; the upper straightening block, the setting device, and the lower straightening block are located between the upper joint and the lower joint;

[0011] The upper and lower straightening blocks are fixedly connected to the main rod, the outer circumference of the upper straightening block fits with the inner wall of the oil pipe, the outer circumference of the lower straightening block fits with the inner wall of the oil pipe or the outer circumference of the lower straightening block has a smaller diameter than the inner wall of the oil pipe, and a plurality of guide channels recessed in the outer circumferences of the upper and lower straightening blocks penetrate the axial direction of the upper and lower straightening blocks, so that when the anti-stuck auxiliary pumping device is installed inside the oil pipe, the fluid can flow from the guide channels at both ends of the upper and lower straightening blocks into the setting device between the upper and lower straightening blocks;

[0012] The sealing device comprises, from top to bottom, a short plunger, a sealing rubber cylinder, and an annular plunger that are fixedly connected in sequence. A certain gap is provided between the central holes of the short plunger, the sealing rubber cylinder, and the annular plunger in the axial direction and the outer peripheral surface of the main rod, and the gap is a flow passage. The short plunger is circumferentially provided with a plurality of flow guide holes. Further, the sealing device can move up and down between the upper straightening block and the lower straightening block along the main rod. A truncated cone-shaped sealing block that is thin on the top and thick on the bottom is fixed on the lower straightening block. After the annular plunger is seated on the lower straightening block, the sealing block is sealed in the central hole of the annular plunger. The inner wall of the annular plunger fits with the outer peripheral surface of the sealing block and blocks and seals the flow passage of the annular plunger. The outer peripheral surface of the annular plunger fits with the inner wall of the oil pipe or is slightly smaller than the inner diameter of the oil pipe.

[0013] The short plunger includes a conical column and a short column which are thin at the top and thick at the bottom. When the anti-stuck pumping aid moves upward with the sucker rod, the upper end of the conical column abuts against the bottom surface of the upper straightening block, and the fluid passing through the guide channel on the upper straightening block falls into the outer peripheral surface of the conical column instead of directly flowing into the central hole in the axial direction of the conical column.

[0014] A plurality of guide holes are provided on the circumference of the cone column, one end of the guide hole is flush with the top surface of the cone column, and the distance between the other end and the bottom surface of the cone column accounts for 1 / 2 or 1 / 3 of the overall length of the short plunger; and the fluid passing through the guide channel on the upper straightening block falls into the outer circumferential surface of the cone column instead of directly flowing from the guide hole into the center hole in the axial direction of the cone column;

[0015] Preferably, the number of the guide holes is four, and the four guide holes are evenly distributed on the circumference of the frustum column. The distance between one end of the guide hole and the bottom surface of the frustum column accounts for 1 / 2 of the overall length of the short plunger, and the width of the guide hole in the circumferential direction accounts for 1 / 2 of the total length of the top surface of the frustum column.

[0016] Furthermore, the outer circumference of the annular plunger is smaller than the inner diameter of the oil pipe, and the outer circumference of the sealing rubber cylinder is provided with a plurality of expansion pieces, the expansion pieces include a spliced ​​plate and clamping plates at both ends of the spliced ​​plate, and the plurality of spliced ​​plates are spliced ​​together to form a hollow cylinder that fits on the outer circumference of the sealing rubber cylinder, and the inner diameter of the hollow cylinder formed by the plurality of clamping plates after splicing is smaller than the inner diameter of the cylinder formed by the spliced ​​plates; further, the annular plunger is sleeved on the main rod, the sealing rubber cylinder is fixedly connected to the annular plunger after being sleeved on the main rod, and the clamping plates of the plurality of expansion pieces are inserted into the annular plunger The plurality of said split plates are pressed and fitted on the outer circumference of the setting rubber tube to wrap the outer circumference of the setting rubber tube. After the said short plunger is sleeved on the main rod, the said clamping plate at the other end is inserted into the short plunger and the short plunger is fixedly connected with the setting rubber tube. At this time, the said split plates can be fitted on the outer circumference of the setting rubber tube by the extrusion effect. When the extrusion of the said split plates is lost, combined with the elastic effect of the setting rubber tube, the setting rubber tube adopts a new elastic rubber material, then there is a certain gap between the said split plates, and the outer circumference of the said split plates is fitted with the inner wall of the oil pipe.

[0017] Furthermore, the gap is in the shape of a lightning bolt; and the expansion piece is in the shape of two quadrilaterals that are staggered up and down, and the expansion piece has a certain curvature.

[0018] There are four expansion pieces, one of which is fixedly connected to the annular plunger and the short plunger, and the remaining three expansion pieces can move along the axial direction, and the moving distance is less than 3 mm.

[0019] Since the inner diameter of the hollow cylinder formed by the plurality of the clamping plates after splicing is smaller than the inner diameter of the cylinder formed by the spliced ​​plates, and the clamping plates are restricted in the short plunger and the annular plunger;

[0020] Furthermore, the height of the annular plunger accounts for 1 / 4 to 1 / 5 of the overall length of the setting device, and the height of the setting rubber cylinder is between 5 and 8 cm;

[0021] The advantages and positive effects of the utility model are:

[0022] The anti-stuck pumping aid used in the oil pipe is a one-way "short column valve" connected in series on the sucker rod, and forms a multi-stage "relay pump" with the sucker pipe, forming a multi-stage lifting oil and separating the sand layer, thereby reducing the load on the pump, effectively extending the service life and pump inspection cycle of the pump, and playing a role in reducing sand sticking, increasing production and oil, etc. Specifically:

[0023] When the pumping aid goes up with the sucker rod, the sealing device is seated on the sealing block on the lower righting block, and the sealing block is sealed in the center hole of the annular plunger. The inner wall of the annular plunger fits against the outer circumference of the sealing block and seals the flow channel of the annular plunger. The four expansion pieces are in a separated state, that is, there is a certain gap between the four expansion pieces and the four expansion pieces fit against the inner wall of the oil pipe. The above overall structure plays the role of a pump plunger.

[0024] When the pumping aid moves downward with the sucker rod, the liquid passes through the guide channel on the lower righting block, and the sealing device is separated from the sealing block on the lower righting block by the impact of the lower liquid. The liquid passes through the annular plunger, the setting rubber cylinder, the center hole of the short plunger in turn, and then through the guide hole on the short plunger, and finally through the guide channel on the upper righting block. At this time, the expansion piece shrinks to the minimum diameter ($59mm) under the action of hydraulic pressure, thus completing a lifting process just like the oil pump.

[0025] Anti-sand jamming capability: When the oil pump goes up, due to the phenomenon of stroke loss, the sealing device does not act synchronously, the sealing rubber cylinder (plunger) is short, and the self-unjamming capability is strong; the expansion piece is radially retractable, and when large sand particles (0-3mm particle size) pass through the sealing rubber cylinder, the expansion piece is sealed on the lower straightening block under the action of the lifting force of the oil pump. Multiple expansion pieces are in a loose state, with an overall diameter of $59mm, and fit against the inner wall of the oil pipe to prevent sand particles from getting stuck in the sealing rubber cylinder.

[0026] When the sealing device moves downward, under the impact of the liquid, multiple expansion pieces are pressed toward the sealing rubber cylinder. Therefore, under the strong pulling force of the pumping unit, the large-grained formation sand is not enough to jam the pumping aid. If the well is stopped for a long time, the liquid column in the oil pipe is divided into several sections by the pumping aid, and the sand will not sink to the liquid inlet valve, so no higher sand column will be formed, so the sucker rod will not be jammed. In addition, the sand removal process of the pumping aid has strong lifting and suction capabilities, and also shows unique characteristics in sand removal.

[0027] By using the anti-stuck extraction aid applied in the oil pipe, there is no need to lift the rod during replacement, thus reducing the operation cost.

[0028] Through the upper and lower straightening blocks, the outer circumference of the upper straightening block fits with the inner wall of the oil pipe, the outer circumference of the lower straightening block fits with the inner wall of the oil pipe or the outer circumference diameter of the lower straightening block is smaller than the inner wall of the oil pipe, thereby playing an anti-eccentric wear role, thereby reducing the excessive stroke wear load of the centralizer ribs.

[0029] The device can temporarily store sand between the truncated cone column, the short column and the oil pipe instead of concentrating and accumulating at the bottom of the pipe, so the device can effectively prevent the rod jamming effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of an anti-stuck extraction aid used in an oil pipe.

[0031] Figure 2 It is a schematic diagram of an inverted anti-stuck extraction aid used in an oil pipe.

[0032] Figure 3 It is the front view of the expansion piece.

[0033] Figure 4 It is a side view of the expansion piece.

[0034] Figure 5 It is a schematic diagram of the upward state of the sealing device used in the anti-sticking and pumping aid in the oil pipe.

[0035] Figure 6 It is a schematic diagram of the downward state of the sealing device in the anti-sticking and pumping aid device in the oil pipe.

[0036] Figure 7 It is a schematic diagram of an anti-stuck extraction aid used in an oil pipe with a protective cap installed.

[0037] In the figure:

[0038] 1. Main rod 2. Upper straightening block 3. Lower straightening block

[0039] 4. Diversion channel 5. Short plunger 6. Sealing rubber cylinder

[0040] 7. Annular plunger 8. Center hole 9. Sealing block

[0041] 10. Telescopic sheet 10-1, Splicing plate 10-2, Snap-on plate

[0042] 5-1, diversion hole 5-2, round cone column 5-3, short column

[0043] 11. Upper joint 12. Lower joint 13. Oil pipe

[0044] 14. Protective cap DETAILED DESCRIPTION

[0045] The present embodiment is an anti-stuck pumping aid used in an oil pipe, comprising a main rod 1, such as Figure 1 As shown, both ends of the main rod 1 are provided with external threads, and the two external thread sections are respectively an upper joint 11 and a lower joint 12, both of which are used to connect with the sucker rod; on the main rod 1 between the upper joint 11 and the lower joint 12, an upper straightening block 2, a setting device, and a lower straightening block 3 are provided in sequence from top to bottom;

[0046] The upper and lower straightening blocks 2 and 3 are fixedly connected to the main rod 1. The upper and lower straightening blocks 2 are made of plastic, and the lower and lower straightening blocks 3 are made of metal. The outer circumference of the upper and lower straightening blocks 2 fits the inner wall of the oil pipe 13, and the outer circumference of the lower and upper straightening blocks 3 is slightly smaller in diameter than the inner wall of the oil pipe 13. A plurality of guide channels 4 recessed in the outer circumference of the upper and lower straightening blocks 2 and 3 penetrate the axial direction of the upper and lower straightening blocks 2 and 3, so that when the anti-stuck auxiliary pumping device is installed inside the oil pipe 13, the fluid can flow from the guide channels 4 at both ends of the upper and lower straightening blocks 2 and 3 into the setting device between the upper and lower straightening blocks 2 and 3;

[0047] Furthermore, the sealing device can move up and down between the upper straightening block 2 and the lower straightening block 3 along the main rod 1. The sealing device includes a short plunger 5, a sealing rubber tube 6, and an annular plunger 7 fixedly connected in sequence from top to bottom. A certain gap is provided between the center hole 8 in the axial direction of the short plunger 5, the sealing rubber tube 6, and the annular plunger 7 and the outer peripheral surface of the main rod 1. The gap is a flow passage. The short plunger 5 is circumferentially provided with four guide holes 5-1; the four guide holes 5-1 are evenly distributed on the circumference of the frustum column 5-2, and the distance between one end of the guide hole 5-1 and the bottom surface of the frustum column 5-2 accounts for 1 / 2 of the overall length of the short plunger 5 , and the width of the guide hole 5-1 in the circumferential direction accounts for 1 / 2 of the total length of the top surface of the cone column 5-2; one end of the guide hole 5-1 is flush with the top surface of the cone column 5-2, and the distance between the other end and the bottom surface of the cone column 5-2 accounts for 1 / 2 of the overall length of the short plunger 5; the short plunger 5 includes a cone column 5-2 and a short column 5-3 that are thin at the top and thick at the bottom. When the anti-stuck auxiliary pumping device moves upward with the sucker rod, the upper end of the cone column 5-2 abuts against the bottom surface of the upper straightening block 2, and the fluid passing through the guide channel 4 on the upper straightening block 2 falls into the outer circumferential surface of the cone column 5-2 instead of directly flowing into the center hole 8 in the axial direction of the cone column 5-2;

[0048] A sealing block 9 of a truncated cone shape with a thin top and a thick bottom is fixed on the lower straightening block 3. After the annular plunger 7 is seated on the lower straightening block 3, the sealing block 9 is sealed in the central hole 8 of the annular plunger 7. The inner wall of the annular plunger 7 is in contact with the outer circumference of the sealing block 9 and the flow passage of the annular plunger 7 is blocked and sealed. The outer circumference of the annular plunger 7 is slightly smaller than the inner diameter of the oil pipe 13.

[0049] Furthermore, the outer circumference of the annular plunger 7 is smaller than the inner diameter of the oil pipe 13, and the outer circumference of the setting rubber cylinder 6 is provided with four expansion pieces 10, such as Figure 3 and Figure 4As shown, the expansion piece 10 includes a splicing plate 10-1 and a clamping plate 10-2 at both ends of the splicing plate 10-1, and the shape of the expansion piece 10 is two quadrilaterals that are staggered up and down, and the expansion piece 10 has a certain curvature. There is a gap between the expansion pieces 10 and the expansion pieces 10 when there is no force, and the gap is lightning-shaped; one of the expansion pieces 10 is fixedly connected to the annular plunger 7 and the short plunger 5, and the remaining three expansion pieces 10 can move along the axial direction, and the moving distance is less than 3mm, and the expansion pieces 10 and the expansion pieces 10 cannot be cross-stacked. After the four splicing plates 10-1 are spliced ​​together, they form a hollow cylinder that fits on the outer circumference of the sealing rubber cylinder 6. After splicing, the inner diameter of the hollow cylinder formed by the multiple clamping plates 10-2 is smaller than the inner diameter of the cylinder formed by the splicing plates 10-1;

[0050] The installation process of the anti-stuck pumping aid used in the oil pipe 13 is as follows:

[0051] 1) First, the expansion piece 10 is fixed to the main rod 1;

[0052] 2) Then the annular plunger 7 is sleeved on the main rod 1, and the sealing rubber tube 6 is fixedly connected to the annular plunger 7 after being sleeved on the main rod 1, and the clamping plates 10-2 of the multiple telescopic pieces 10 are inserted into the annular plunger 7, and the multiple splicing plates 10-1 are pressed and fitted on the outer circumference of the sealing rubber tube 6 to wrap the outer circumference of the sealing rubber tube 6, and after the short plunger 5 is sleeved on the main rod 1, the clamping plate 10-2 at the other end is inserted into the short plunger 5, and the short plunger 5 is fixedly connected to the sealing rubber tube 6. At this time, the splicing plate 10-1 can be fitted on the outer circumference of the sealing rubber tube 6 through the extrusion effect. When the extrusion of the splicing plate 10-1 is lost , combined with the elastic effect of the sealing rubber cylinder 6, the sealing rubber cylinder 6 adopts a new elastic rubber material, so there is a certain gap between the splicing plates 10-1 and the splicing plates 10-1, and the outer peripheral surface of the splicing plate 10-1 is in contact with the inner wall of the oil pipe 13; since the inner diameter of the hollow cylinder formed by the multiple clamping plates 10-2 after splicing is smaller than the inner diameter of the cylinder formed by the splicing plates 10-1, and the clamping plate 10-2 is restricted in the short plunger 5 and the annular plunger 7, the telescopic piece 10 is restricted between the annular plunger 7 and the short plunger 5, and the splicing plate is stuck between the annular plunger 7 and the short plunger 5 and cannot move up and down, but can only move left and right.

[0053] 3) Finally, fix the upper straightening block 2 on the main rod 1.

[0054] Example 1: Before using the device Figure 7 As shown, the upper joint 11 and the lower joint 12 are both provided with protective caps 14; this application is applied to Hong Kong 3-39-1. During use, Figure 5As shown, when the pumping aid goes up with the sucker rod, the sealing device is seated on the sealing block 9 on the lower straightening block 3, and the sealing block 9 is sealed in the central hole 8 of the annular plunger 7. The inner wall of the annular plunger 7 is in contact with the outer peripheral surface of the sealing block 9 and the flow channel of the annular plunger 7 is blocked and sealed. The four expansion pieces 10 are in a separated state, that is, there is a certain gap between the four expansion pieces 10 and the four expansion pieces 10 are in contact with the inner wall of the oil pipe 13. The above overall structure plays the role of a pump plunger.

[0055] like Figure 6 As shown, when the pumping aid moves downward with the sucker rod, the liquid passes through the guide channel 4 on the lower righting block 3, and the sealing device is impacted by the lower liquid and separated from the sealing block 9 on the lower righting block 3. The liquid passes through the annular plunger 7, the sealing rubber cylinder 6, the center hole 8 of the short plunger 5 in sequence, and then passes through the guide hole 5-1 on the short plunger 5, and finally passes through the guide channel 4 on the upper righting block 2. At this time, the expansion piece 10 shrinks to the minimum diameter ($59mm) under the action of hydraulic pressure, thus completing a lifting process like the oil pump.

[0056] like Figure 5 As shown, when the oil pump goes up, due to the phenomenon of stroke loss, the sealing device does not act synchronously, the plunger is short, and the self-unblocking ability is strong; the expansion piece 10 is radially retractable, and when large sand particles (0-3mm particle size) pass through the sealing rubber cylinder 6, the expansion piece 10 is sealed on the lower straightening block 3 under the action of the lifting force of the oil pump, and multiple expansion pieces 10 are in a loose state, with an overall diameter of $59mm, and fit with the inner wall of the oil pipe 13 to prevent sand particles from getting stuck in the sealing rubber cylinder 6.

[0057] like Figure 6 As shown, when the sealing device moves downward, under the impact of the liquid, multiple expansion pieces 10 are pressed tightly toward the sealing rubber cylinder 6, so under the strong pulling force of the pumping unit, the large-grained formation sand is not enough to jam the pumping aid; if the well is stopped for a long time, since the liquid column in the oil pipe 13 is divided into several sections by the pumping aid, the sand will not sink to the liquid inlet valve, so no higher sand column will be formed, so the sucker rod will not be jammed: in addition, the sand removal process of the pumping aid has a strong lifting and suction capacity, and also shows unique characteristics in sand removal.

[0058] The production cycle of the anti-stuck pumping aid used in the oil pipe 13 was 305 months. By comparing with the traditional oil pump, the device increased the oil production by 1,794 tons.

[0059] In addition, the anti-stuck pumping aid used in the oil pipe 13 has the following advantages through use:

[0060] 1) The auxiliary pump oil production technology can significantly increase the production of low-permeability reservoirs and low-capacity pumping wells.

[0061] 2) For pumping wells with serious sand production, the sand removal technology can be promoted with low investment, which can effectively extend the pump inspection cycle of sand producing oil wells.

[0062] 3) After six months of normal use, the tool is in good condition and can continue to be used downhole after a simple cleaning.

[0063] 4) In deep well pumping, the leakage of the pumping aid is used to reduce the liquid column load and the suspended load, so as to achieve the purpose of deep hanging and high displacement.

[0064] Embodiment 2:

[0065] The anti-stuck pumping aid used in the oil pipe 13 is used in heavy oil and large inclined wells. Through the upper straightening block 2 and the lower straightening block 3, the outer circumference of the upper straightening block 2 fits with the inner wall of the oil pipe 13, and the outer circumference of the lower straightening block 3 fits with the inner wall of the oil pipe 13 or the outer circumference of the lower straightening block 3 is smaller than the inner wall of the oil pipe 13, thereby playing an anti-eccentric wear role, thereby reducing the excessive stroke wear resistance load of the ribs of the straightening device, and solving the problem of the downward movement of the sucker rod.

[0066] The anti-stuck pumping aid used in the oil pipe 13 has a strong ability to prevent sand from getting stuck. Its own sealing rubber tube 6 is relatively short and has a retractable telescopic piece 10, which can adapt to sand particles of different sizes. When the machine is stopped, the pumping aid divides the liquid column into several sections, so that the sand cannot be concentrated and accumulated at the bottom of the pipe, which can effectively prevent the rod from getting stuck.

[0067] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. An anti-stuck pumping aid used in an oil pipe, comprising a main rod and an upper straightening block, a setting device, and a lower straightening block arranged on the main rod in sequence from top to bottom; characterized in that: The upper and lower straightening blocks are fixedly connected to the main rod, the outer circumference of the upper straightening block fits with the inner wall of the oil pipe, the outer circumference of the lower straightening block fits with the inner wall of the oil pipe or the outer circumference of the lower straightening block has a smaller diameter than the inner wall of the oil pipe, and a plurality of guide channels recessed in the outer circumferences of the upper and lower straightening blocks penetrate the axial direction of the upper and lower straightening blocks, so that when the anti-stuck auxiliary pumping device is installed inside the oil pipe, the fluid can flow from the guide channels at both ends of the upper and lower straightening blocks into the setting device between the upper and lower straightening blocks; The sealing device comprises, from top to bottom, a short plunger, a sealing rubber cylinder and an annular plunger which are fixedly connected in sequence. A gap is provided between the central holes of the short plunger, the sealing rubber cylinder and the annular plunger in the axial direction and the outer peripheral surface of the main rod, and the gap is a flow passage. The sealing device moves up and down between the upper straightening block and the lower straightening block along the main rod; a plurality of guide holes are provided in the circumferential direction of the short plunger; a frustoconical sealing block which is thin on the top and thick on the bottom is fixed on the lower straightening block. After the annular plunger is sealed on the lower straightening block, the sealing block is sealed in the central hole of the annular plunger, the inner wall of the annular plunger is in contact with the outer peripheral surface of the sealing block and the flow passage of the annular plunger is blocked and sealed, and the outer peripheral surface of the annular plunger is in contact with the inner wall of the oil pipe or is smaller than the inner diameter of the oil pipe.

2. The anti-stuck extraction aid used in an oil pipe according to claim 1, characterized in that: The outer circumference of the annular plunger is smaller than the inner diameter of the oil pipe. The outer circumference of the setting rubber cylinder is provided with a plurality of expansion pieces, and the expansion pieces include a splicing plate and clamping plates at both ends of the splicing plate. The plurality of splicing plates are spliced ​​to form a hollow cylinder that fits on the outer circumference of the setting rubber cylinder. After splicing, the inner diameter of the hollow cylinder formed by the plurality of clamping plates is smaller than the inner diameter of the cylinder formed by the splicing plates. The annular plunger is sleeved on the main rod, and the sealing rubber tube is fixedly connected to the annular plunger after being sleeved on the main rod. The clamping plates of the multiple telescopic plates are inserted into the annular plunger, and the multiple splicing plates are pressed and fitted on the outer circumference of the sealing rubber tube to wrap the outer circumference of the sealing rubber tube. After the short plunger is sleeved on the main rod, the clamping plate at the other end is inserted into the short plunger and the short plunger is fixedly connected to the sealing rubber tube. At this time, the splicing plate is fitted on the outer circumference of the sealing rubber tube through the extrusion effect. When the extrusion of the splicing plate is lost, there is a gap between the splicing plates, the outer circumference of the splicing plate is fitted with the inner wall of the oil pipe, and the clamping plate is restricted in the short plunger and the annular plunger.

3. The anti-stuck extraction aid used in an oil pipe according to claim 2, characterized in that: The gap is in the shape of a lightning bolt, and the expansion piece is in the shape of two quadrilaterals that are staggered up and down, and the expansion piece has a certain curvature.

4. The anti-stuck extraction aid used in an oil pipe according to claim 3, characterized in that: There are four expansion pieces, one of which is fixedly connected to the annular plunger and the short plunger, and the remaining three expansion pieces can move along the axial direction, and the moving distance is less than 3 mm.

5. The anti-stuck extraction aid used in an oil pipe according to any one of claims 1 to 4, characterized in that: The short plunger includes a conical column and a short column that are thin at the top and thick at the bottom. When the anti-stuck auxiliary pumping device moves upward with the sucker rod, the upper end of the conical column abuts against the bottom surface of the upper straightening block, and the fluid passing through the guide channel on the upper straightening block falls into the outer circumferential surface of the conical column.

6. The anti-stuck extraction aid used in an oil pipe according to claim 5, characterized in that: A plurality of guide holes are arranged on the circumference of the conical column, one end of the guide hole is flush with the top surface of the conical column, and the other end is at a distance from the bottom surface of the conical column that accounts for 1 / 2 or 1 / 3 of the overall length of the short plunger; and the fluid passing through the guide channel on the upper straightening block falls into the outer circumferential surface of the conical column.

7. The anti-stuck extraction aid used in an oil pipe according to claim 5, characterized in that: There are four guide holes, which are evenly distributed on the circumference of the conical column. The distance between one end of the guide hole and the bottom surface of the conical column accounts for 1 / 2 of the overall length of the short plunger, and the width of the guide hole in the circumferential direction accounts for 1 / 2 of the total length of the top surface of the conical column.

8. The anti-stuck extraction aid used in an oil pipe according to claim 7, characterized in that: Both ends of the main rod are provided with external threads, and the two external thread sections are an upper joint and a lower joint respectively, both of which are used to connect with the sucker rod; the upper straightening block, the sealing device, and the lower straightening block are located between the upper joint and the lower joint.

9. The anti-stuck extraction aid used in an oil pipe according to claim 8, characterized in that: Before being connected with the sucker rod, the upper joint and the lower joint are both covered with protective caps.

10. The anti-stuck extraction aid used in an oil pipe according to claim 9, characterized in that: The height of the annular plunger accounts for 1 / 4 to 1 / 5 of the overall length of the setting device, and the height of the setting rubber cylinder is between 5-8 cm.

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