Screw pump anchoring device capable of repeatedly testing pressure and anchoring and using method of screw pump anchoring device

Abstract

The invention relates to a screw pump anchoring device capable of repeatedly testing pressure and anchoring and a using method thereof, the screw pump anchoring device comprises a pressure testing valve and an anchoring mechanism, the lower end of a valve sleeve of the pressure testing valve is connected with a transmission joint, and an ejector rod is connected with a pressure testing groove in a connecting pipe through a transmission rod fixed in the transmission joint; the cone internally provided with the slip is installed outside the center pipe, and the reset spring is installed at the lower end of the cone and located between the center pipe and the slip. A centralizing body provided with a centralizing block and a centralizing spring is installed outside the track pipe, a setting track is arranged on the upper portion of the track pipe, and a centralizing mechanism moving groove is formed in the lower portion of the track pipe. A track pin installed in the center pipe is connected with a setting track in the track pipe, and an anti-rotating pin in the centralizing body is connected with a centralizing mechanism moving groove in the track pipe. The ball blocking cover, the connecting pipe, the transition connector, the center pipe and the lower connector are sequentially connected from top to bottom. The device can repeatedly perform pressure testing, anchoring and unblocking actions, and can meet the requirement of multiple pressure testing of the oil pipe column in the process of descending the oil pipe column into the well in a screw pump producing well.

Description

TECHNICAL FIELD

[0001] The present application relates to the anchoring device of the downhole screw pump of the oil production well in the petroleum industry, and particularly relates to a screw pump anchoring device capable of repeated pressure testing and a use method thereof. BACKGROUND

[0002] The screw pump is a rotary oil pump lowered into the downhole of the oil production well, which transmits the rotating power on the ground to the downhole through the pump rod to drive the pump core to rotate, and the pump body is fixed on the oil pipe. When the screw pump works, the pump body will be subjected to the action of the pump core to generate a rotating torque. In order to avoid the rotation of the oil pipe under the action of the torque and cause the oil pipe to be tripped, the screw pump anchoring device is needed to anchor the pump body on the casing to prevent the rotation of the oil pipe.

[0003] In the process of lowering the oil pipe string with the screw pump body into the well to the set position, the pressure testing and leakage detection operation procedures are continuously performed on the oil pipe string, which requires the screw pump anchoring device to have the pressure testing function. However, the existing screw pump anchoring device, also known as screw pump anchor, realizes the pressure testing and anchoring actions by using pressure testing shear pins and anchoring shear pins. In the process of pressure testing and anchoring of the oil pipe string, the corresponding pressure testing shear pins and anchoring shear pins in the screw pump anchor are sheared off, and the working state before the action cannot be restored after the pressure testing and anchoring. Therefore, the pressure testing and anchoring actions can only be performed once and cannot be repeated. That is, the pressure testing can only be performed when the pipe string is lowered to the position, which cannot meet the needs of multiple pressure testing and leakage detection during the lowering into the well.

[0004] In order to solve the above problems, through retrieval, there are currently several types of screw pump anchors in the petroleum industry: the patent application number CN200910101426.5, application date: August 4, 2009, discloses a screw pump anchor, which comprises a sleeve, a slip tooth, a taper joint, a body, a center pipe connected with the lower joint, a centralizing block with a centralizing spring, a sleeve with a positioning pin cooperating with the track groove on the center pipe, and a anti-rotation device composed of radial and axial anchoring mechanisms. The axial anchoring mechanism is composed of the taper joint cooperating with the slip tooth, and the radial anchoring mechanism is composed of the anti-rotation tooth uniformly distributed on the body in the horizontal direction cooperating with the center pipe and the casing, and is spaced apart from the centralizing spring. The cross section of the center pipe cooperation part is a cam shape with a through hole in the middle. The invention adds the anti-rotation function, and the combined straight anchor chain force and the oil rod torsion force make the axial and radial anchoring functions more reliable, effectively suppress the superimposed vibration between the pump operation, and have the upper and lower double clamping safety functions, which fundamentally eliminate and prevent the major accidents caused by the screw pump tripping, the oil pipe tripping, the pump body and the oil pipe rotating together, and the pump body and the oil pipe reversing, and improve the economic benefits and the convenient operation.

[0005] However, the screw pump anchor described above still cannot solve the problem of continuous and repeated pressure testing of the tubing string during the process of lowering into the well.

[0006] The patent application number CN202310218322.2, application date 2023-03-09 discloses a pressure testing and anchoring integrated screw pump anchor. The invention discloses a pressure testing and anchoring integrated screw pump anchor. By setting a pressure testing valve ball, a ball seat, a pressure testing shear pin, a pressure testing lock block, and a pressure relief seat, when the pump truck tubing is being pressed, the pressure testing valve ball pushes the ball seat to descend and shears the pressure testing shear pin, simultaneously releasing the pressure testing lock block, so that the valve cover and the pressure relief seat relatively displace, the valve cover ascends when the rotating string group is set and sealed, the outer end of the ball seat is sealed, the oil jacket is connected, and the pressure testing process is completed. By setting an auxiliary anchoring part, a torsion pipe, a torsion joint, a thrust pipe, a thrust joint, and a compression joint, when the tubing is rotated, the compression joint rotates downward and shears the anchoring shear pin, pushes the cone downward to expand the anchor shoe to contact the inner wall of the casing for anchoring. By setting an unsealing part for driving the anchor shoe to unanchor, the device can realize the lowering of a trip of tubing string to complete the tubing string pressure testing and tubing string anchoring two processes.

[0007] However, the screw pump anchor described above can only be tested by shearing the pressure testing shear pin, and can only be tested once when the tubing string is lowered to the target layer, and cannot meet the demand for multiple pressure testing and repeated pressure testing of the tubing string during the process of lowering into the well.

[0008] The current screw pump anchor cannot repeatedly test pressure and needs to be changed. SUMMARY

[0009] In view of the deficiencies in the prior art, the purpose of the present application is to provide a screw pump anchoring device that can repeatedly test pressure and its use method, so that it can repeatedly complete the pressure testing, anchoring, and unsealing actions, meet the demand for multiple pressure testing during the process of lowering into the well, and can be repeatedly used. Improve the success rate of screw pump lowering into the well and reduce production costs.

[0010] In order to achieve the above object, the technical scheme of the present application is as follows: a screw pump anchoring device capable of repeated pressure testing, comprising a pressure testing valve, an anchoring mechanism and a righting mechanism, wherein a ball blocking cover is arranged in the pressure testing valve, a slip and a cone are arranged in the anchoring mechanism, and a righting block and a righting spring are arranged in the righting mechanism; a valve sleeve lower end of the pressure testing valve is connected with a transmission joint, a top rod is connected with a pressure testing groove in a connecting pipe through a transmission rod fixed in the transmission joint; a tension sleeve is suspended above a transition joint and connected with the cone, the cone with the slip inside is installed outside a central pipe, a reset spring is installed at a lower end of the cone and between the central pipe and the slip; a lower end of the slip is connected with a slip holder through an expansion slot, the slip holder, a track joint and a track pipe are connected in sequence from top to bottom; the righting body with the righting block and the righting spring is installed outside the track pipe, an upper part of the track pipe is provided with a setting track and a lower part is provided with a righting mechanism moving groove; a track pin installed in the central pipe is connected with the setting track in the track pipe, an anti-rotation pin in the righting body is connected with the righting mechanism moving groove in the track pipe; a traction pin in a lower joint is connected with an annular groove in the righting body; the ball blocking cover, the connecting pipe, the transition joint, the central pipe and the lower joint are connected in sequence from top to bottom, and the transition joint, the tension sleeve and the central pipe are gap-fitted.

[0011] Preferably, an inner cavity of the ball blocking cover is a non-equal-diameter inner cavity and a middle part is provided with an inner clamping table, an inner circle and an outer circle below the inner clamping table are provided with sealing rings, an inner circle of a lower part of the ball blocking cover is provided with internal threads and is threadedly connected with the connecting pipe; a valve seat is arranged between the inner clamping table and the connecting pipe; an upper inner circle of the valve seat is provided with an inner chamfer.

[0012] Preferably, an upper outer circle of the connecting pipe is a non-equal-diameter outer circle and is provided with an outer clamping table at the upper outer circle, a lower outer circle of the outer clamping table is a conical surface which is matched with a conical surface of an upper end inner circle of the transmission joint; an outer diameter of a lower outer circle of the connecting pipe is consistent with an inner diameter of the transmission joint.

[0013] Preferably, the top rod is a solid rod and is provided with a liquid flow through step at an outer circle of an upper rod body, more than three liquid flow holes are arranged in the liquid flow through step; a screw hole is arranged at a lower end of a rod body of the top rod and is connected with a transmission rod welded at the other end in the transmission joint; a number of the transmission rods connected between the transmission joint and the top rod is consistent with a number of the pressure testing grooves in the connecting pipe.

[0014] Preferably, an upper inner circle step of the tension sleeve is suspended on a lower outer circle step of the transition joint and is threadedly connected with the cone, a lower end of the tension sleeve abuts on an upper outer circle step of the cone; a thrust bearing or a ball is arranged in a concave surface of an outer periphery upper end of a central hole of the cone.

[0015] Preferably, the setting track is a spiral track penetrating the track pipe body, the spiral angle of the spiral track is 45 degrees, and the spiral track is arranged in 20%-30% of the pipe body of the track pipe circumference; one end of the track pin is threadedly connected in the screw hole of the central pipe, the outer circle of the other end can be fitted with an axle sleeve or a sliding bearing smaller than the width of the setting track groove, and the end of the track pin with the axle sleeve or the sliding bearing is installed in the setting track in the track pipe.

[0016] Preferably, the righting springs in the righting mechanism are provided in two types and are righting coil springs and righting leaf springs respectively, the righting coil springs and the righting leaf springs are alternately installed in the righting blocks in the righting body; the two ends of the righting block are installed in the embedding grooves of the righting body through the pressing rings and the pin stop rings threadedly connected with the righting body respectively.

[0017] Preferably, the axial length of the pin stop ring connected below the righting block is greater than the installation position of the anti-rotation pin; the anti-rotation pins in the righting body are provided in two or more, and the traction pins connected in the annular grooves in the outer circle of the lower part of the righting body are provided in two or more.

[0018] Preferably, the axial length of the pressure testing groove in the connecting pipe is consistent with the axial length of the righting mechanism moving groove in the track pipe.

[0019] Preferably, the two ends of the valve sleeve are threadedly connected with the upper joint and the transmission joint respectively and are threadedly connected with the oil pipe string through the upper joint; the stop ball cover, the connecting pipe, the transition joint, the central pipe and the lower joint are threadedly connected in sequence.

[0020] A screw pump anchoring device capable of repeated pressure testing and anchoring, comprising the following steps: a, setting; b, pressure testing preparation; c, pressure testing; d, unsetting; e, pressure relief; f, the oil pipe string continues to go downhole.

[0021] Compared with the prior art, the significant use effect of the present application is: 1, the present application can repeatedly perform pressure testing, anchoring and unsetting actions, can meet the needs of multiple pressure testing of the oil pipe string in the screw pump oil production well during going downhole, and can be operated multiple times and repeatedly through the present application, and the oil pipe string can be pressure tested and leak tested multiple times at different depths.

[0022] 2, the friction force between the righting body and the casing in the present application can be transmitted to the lower joint through the traction pin, and has no influence on the setting action of the slip; when the oil pipe string is lowered, the setting of the slip will not be mistaken if the casing is deformed and stuck.

[0023] 3, the force for pushing the slip to set is the pushing force of the track pin in the central pipe to the setting track in the track pipe, which is not disturbed by the weight of the tail pipe in the oil pipe string and the friction force of the righting body, and the setting and unsetting work is reliable.

[0024] 4. The present invention can be used repeatedly. It solves the problem that existing screw pump anchoring devices cannot perform multiple pressure tests during the downhole operation, effectively avoids all the disadvantages caused by the inability to perform multiple pressure tests during the downhole operation, effectively improves the success rate of the screw pump's one-time downhole installation, can achieve good economic benefits, and has significant use effect and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic diagram of the integrated screw pump anchor structure of the present invention.

[0026] Figure 2 for Figure 1 Schematic diagram of the AA structure.

[0027] In the figure: upper joint 1, ball cover 2, valve ball 3, valve seat 4, valve sleeve 5, push rod 6, transfer joint 7, transmission rod 8, connecting pipe 9, transition joint 10, tension sleeve 11, center pipe 12, cone 13, slip 14, return spring 15, slip support 16, track joint 17, pressure ring 18, track pin 19; righting block 20, righting coil spring 20-1, righting leaf spring 20-2; track tube 21, righting body 22, pin retaining ring 23, anti-rotation pin 24, traction pin 25, lower joint 26, sleeve 27. DETAILED DESCRIPTION

[0028] The accompanying drawings are for reference and illustration purposes only and are not intended to limit the scope of protection of the present invention. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0031] Referring to Figure 1 and Figure 2 A repeatable pressure testing anchorable screw pump anchoring device, comprising a pressure testing valve, an anchoring mechanism and a centralizing mechanism, the pressure testing valve is provided with a ball check cover 2, the anchoring mechanism is provided with a slip 14 and a cone 13, and the centralizing mechanism is provided with a centralizing block 20 and a centralizing spring, wherein: the lower end of the valve sleeve 5 of the pressure testing valve is connected with the transmission joint 7, the jack 6 is connected with the pressure testing groove in the connecting pipe 9 through the transmission rod 8 fixed in the transmission joint 7; the tension sleeve 11 is suspended above the transition joint 10 and connected with the cone 13, the cone 13 with the slip 14 inside is installed outside the central pipe 12, the reset spring 15 is installed at the lower end of the cone 13 and between the central pipe 12 and the slip 14; the lower end of the slip 14 is connected with the slip shoe 16 through the telescopic slip groove, the slip shoe 16, the track joint 17 and the track pipe 21 are connected in turn from top to bottom; the centralizing body 22 provided with the centralizing block 20 and the centralizing spring is installed outside the track pipe 21, the upper part of the track pipe 21 is provided with a setting track and the lower part is provided with a centralizing mechanism moving groove; the track pin 19 installed in the central pipe 12 is connected with the setting track in the track pipe 21, the anti-rotation pin 24 in the centralizing body 22 is connected with the centralizing mechanism moving groove in the track pipe 21; the traction pin 25 in the lower joint 26 is connected with the annular groove in the centralizing body 22; the ball check cover 2, the connecting pipe 9, the transition joint 10, the central pipe 12 and the lower joint 26 are connected in turn from top to bottom, and the transition joint 10, the tension sleeve 11 and the central pipe 12 are gap-fitted.

[0032] The pressure testing valve, the anchoring mechanism and the centralizing mechanism are connected together through the ball check cover 2, the connecting pipe 9, the transition joint 10, the central pipe 12 and the lower joint 26. Since the pressure testing valve is connected with the connecting pipe 9 through the transmission joint 7 and the transmission rod 8, and the transmission rod 8 installed in the pressure testing groove in the connecting pipe 9 through the transmission joint 7 is connected with the jack 6, when the oil pipe string of the screw pump is lifted or lowered on the ground, the pressure testing valve connected with the oil pipe string will move up and down outside the connecting pipe 9 along the pressure testing groove in the connecting pipe 9, the jack 6 in the pressure testing valve will lift or drop the valve ball 3, and the functions of pressure testing and pressure relief are realized.

[0033] Because the transition joint 10, the tension sleeve 11 and the central tube 12 are gap fit, the centralizing body 22 is provided with a centralizing mechanism moving groove and a setting track, the anti-rotation pin 24 is inserted into the centralizing mechanism moving groove in the track pipe 21, and the track pin 19 in the central tube 12 is connected with the setting track in the track pipe 21. When the oil pipe string is rotated on the ground, the central tube 12 and the lower joint 26 rotate relative to the track pipe 21. Because the anti-rotation pin 24 in the centralizing body 22 is inserted into the centralizing mechanism moving groove in the track pipe 21, the track pipe 21 cannot rotate, but can only move up and down along the centralizing mechanism moving groove under the guidance of the anti-rotation pin 24. When the track pipe 21 moves upward, the track joint 17 and the slip shoe 16 are pushed to move upward, and the slips 14 are extended outward along the telescopic slip slot at the upper end of the slip shoe 16, supported and anchored on the inner wall of the casing 27, so that the setting of the device and the oil pipe string is realized. At this time, the pressure test of the oil pipe string can be performed through the pressure test valve, the connecting pipe 9 and the central tube 12.

[0034] When the oil pipe string is reversely rotated on the ground, the track pipe 21 moves downward, the slips 14 are retracted inward, and the device and the oil pipe string are released from the support. According to the operation requirement, the oil pipe string can continue to descend or be pulled up.

[0035] As described above, the device has the operation functions of repeated pressure test, anchoring and releasing, can meet the requirement of multiple pressure test and leakage detection of the oil pipe string at different depths when the oil pipe string with the screw pump body is lowered into the well, and can be repeatedly used. The device solves the problem that the existing screw pump anchoring device cannot be pressure tested multiple times during the lowering into the well, effectively avoids all disadvantages caused by the inability to pressure test multiple times during the lowering into the well, effectively improves the success rate of the screw pump during the one-time lowering into the well, and has remarkable use effect.

[0036] On the basis of the above embodiment one, the device has the following embodiments: preferably, the inner cavity of the ball blocking cover 2 is a non-equal-diameter inner cavity, and an inner clamping table is arranged in the middle part; a sealing ring is arranged on the inner circle and the outer circle below the inner clamping table; the lower inner circle of the ball blocking cover 2 is provided with an inner thread for thread connection with the connecting pipe 9; the valve seat 4 is arranged between the inner clamping table and the connecting pipe 9, and the connecting pipe 9 clamps the valve seat 4 below the inner clamping table; and the upper inner circle of the valve seat 4 is provided with an inner chamfer. The contact area with the valve ball 3 can be increased, and the pressure test channel of the device and the oil pipe string can be more tightly closed.

[0037] Preferably, the upper outer circle of the connecting pipe 9 is a non-equal-diameter outer circle, and an outer clamping table is arranged on the upper outer circle; the lower outer circle of the outer clamping table is a conical surface matched with the conical surface of the inner circle at the upper end of the transmission joint 7; and the outer diameter of the lower outer circle of the connecting pipe 9 is consistent with the inner diameter of the transmission joint 7.

[0038] A preferred embodiment: the top rod 6 is a solid rod and has a liquid flow through step on the outer circle of the upper rod body, and more than three liquid flow holes are arranged in the liquid flow through step; a screw hole is arranged at the lower end of the rod body of the top rod 6, and a transmission rod 8 welded at the other end in the transmission joint 7 is connected through the screw hole; the number of the transmission rod 8 connected between the transmission joint 7 and the top rod 6 corresponds to the number of the pressure test grooves in the connecting pipe 9.

[0039] A preferred embodiment: the upper inner circle step of the tension sleeve 11 is suspended on the lower outer circle step of the transition joint 10 and is threadedly connected with the cone 13, and the lower end of the tension sleeve 11 abuts against the upper outer circle step of the cone 13; a thrust bearing or ball is arranged in the concave surface on the outer periphery of the central hole of the cone 13. The tension sleeve 11 is suspended at the lower end of the transition joint 10 and forms a clearance fit with the transition joint 10 and the central pipe 12. Due to the effect of the track pin 19 in the central pipe 12 inserted into the righting mechanism moving groove in the track pipe 21, the central pipe 12 can rotate relative to the anchoring mechanism and makes the track pipe 21 unable to rotate but can move up and down by the length of the righting mechanism moving groove. The thrust bearing or ball installed between the transition joint 10 and the cone 13 can reduce the rotational friction therebetween.

[0040] A preferred embodiment: the setting track is a spiral track penetrating through the pipe body of the track pipe 21, the spiral angle of the spiral track is 45 degrees and is arranged in 20%-30% of the pipe body of the track pipe 21; one end of the track pin 19 is threadedly connected in the screw hole of the central pipe 12, and the outer circle of the other end can be fitted with an axle sleeve or a sliding bearing smaller than the width of the setting track groove and is installed in the setting track in the track pipe 21 with the axle sleeve or the sliding bearing. The track pipe 21 is provided with two kinds of grooves, i.e. the spiral setting track and the righting mechanism moving groove, and the track pin 19 on the central pipe 12 penetrates into the spiral setting track, and when the central pipe 12 rotates relative to the track pipe 21, the track pin 19 can generate an axial thrust on the track pipe 21. As a preferred embodiment, the inclination angle of the setting track is 45 degrees, and in order to reduce the friction, the end of the track pin 19 can be additionally provided with an axle sleeve or a sliding bearing.

[0041] A preferred embodiment: the righting springs in the righting mechanism are two kinds and are the righting coil spring 20-1 and the righting leaf spring 20-2, respectively, and the righting coil spring 20-1 and the righting leaf spring 20-2 are alternately installed in the righting block 20 in the righting body 22; the two ends of the righting block 20 are respectively installed in the embedding grooves of the righting body 22 through the pressing ring 18 and the pin stop ring 23 threadedly connected with the righting body 22.

[0042] A preferred embodiment: the axial length of the pin stop ring 23 connected below the centralizing block 20 is greater than the installation position of the anti-rotation pin 24; the anti-rotation pin 24 in the centralizing body 22 is provided in two or more, and the traction pin 25 connected in the annular groove in the outer circle of the lower part of the centralizing body 22 is provided in two or more.

[0043] A preferred embodiment: the axial length of the pressure testing groove in the connecting pipe 9 is consistent with the axial length of the centralizing mechanism moving groove in the track pipe 21.

[0044] A preferred embodiment: the two ends of the valve sleeve 5 are respectively threadedly connected with the upper joint 1 and the transmission joint 7, and the valve sleeve 5 is threadedly connected with the oil pipe string through the upper joint 1; the stop ball cover 2, the connecting pipe 9, the transition joint 10, the central pipe 12 and the lower joint 26 are sequentially threadedly connected.

[0045] The use method of the device is as follows: a, setting: rotating the oil pipe string at the wellhead, driving the pressure testing valve to rotate, the pressure testing valve driving the connecting pipe 9 and the central pipe 12 to rotate through the transmission rod 8, and the track pipe 21 not rotating under the action of the anti-rotation pin 24 in the centralizing mechanism. The track pin 19 drives the track pipe 21 to go up under the driving of the central pipe 12, and the track pipe 21 drives the track joint 17, the slip block 16 and the slip 14 to go up in turn. Since the axial relative position of the cone 13 and the central pipe 12 is fixed, the distance between the slip 14 and the cone 13 gradually shortens, the slip 14 expands outward along the inclined surface of the cone 13, and is clamped on the inner wall of the casing 27. After the expanded slip 14 contacts the casing 27, a resistance torque for preventing the anchoring mechanism from rotating is generated, further preventing the track pipe 21 from going up, so that the track pipe 21 is subjected to a greater upward thrust of the track pin 19, until the slip 14 is completely expanded and anchored in the casing 27. In the case that the torque of the oil pipe string is not released, the oil pipe string is fixed at the wellhead, and the setting is completed.

[0046] b, pressure testing preparation: after the setting is completed, the torque of the oil pipe string is not released, the valve sleeve 5 in the pressure testing valve connected with the oil pipe string drives the transmission joint 7 to go down, the connecting pipe 9 and the central pipe 12 remain stationary due to the support of the cone 13 set on the inner wall of the casing 27, the top rod 6 in the pressure testing valve goes down relative to the valve ball 3, the top rod 6 leaves the valve ball 3, the valve ball 3 falls on the valve seat 4, the inner cavity of the oil pipe string is closed, and the pressure testing preparation is completed.

[0047] c, pressure testing: hydraulic pressure is punched into the oil pipe string on the ground, and the change of the hydraulic pressure is paid attention to, and whether the oil pipe string has leakage is checked.

[0048] d, unblocking: releasing the torque of the wellhead tubing string, the slips 14 will no longer be subjected to the upward thrust of the track pipe 21, the tubing string is pulled up, the cone 13 is pulled up by the tension sleeve 11, and the distance between the cone 13 and the anchor slips 14 on the casing 27 is pulled apart, the unblocking is completed, and the reset spring 15 can assist the upward movement of the slips 14, so that the unblocking action is more reliable.

[0049] e, pressure relief: continue to pull up the tubing string after unblocking, the top rod 6 in the pressure test valve is pulled up, the ball cover 2 and the valve seat 4 are followed by the connecting pipe 9 and the central pipe 12, and the top rod 6 opens the valve ball 3 under the combined action of gravity and the friction force between the central pipe 12 and the casing 27, and the pressure relief is realized; f, the tubing string continues to be lowered into the well: after unblocking, the tubing string is lowered again, the central pipe 12 is pulled down under the action of the traction pin 25, and the central pipe 12 will not generate a thrust force on the slips 14, so that the friction force between the central pipe 12 and the casing 27 can be avoided to cause a false setting action.

[0050] The present application can repeatedly perform pressure testing, anchoring and unblocking actions, and can meet the needs of multiple pressure testing of the tubing string in the screw pump oil production well during the lowering process. Through the present application, multiple and repeated operations can be performed, and the tubing string can be pressure tested and leak tested multiple times at different depths, which has significant use effect and application value.

[0051] The above-described embodiments are merely typical embodiments, but the present application is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and concept of the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions described in the foregoing embodiments, or make equivalent replacements to part of the technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and concept of the present application should be included in the protection scope of the present application. Therefore, the protection scope is not limited to the above description.

Claims

1. A repeatable pressure testing anchored screw pump anchoring device, comprising a pressure testing valve, an anchoring mechanism and a centralizing mechanism, the pressure testing valve is provided with a ball blocking cover (2), the anchoring mechanism is provided with a slip (14) and a cone (13), and the centralizing mechanism is provided with a centralizing block (20) and a centralizing spring, characterized in that: The lower end of the valve sleeve (5) of the pressure testing valve is connected with the transmission joint (7), the ejector rod (6) is connected with the pressure testing groove in the connecting pipe (9) through the transmission rod (8) fixed in the transmission joint (7); the tension sleeve (11) is suspended above the transition joint (10) and connected with the cone (13), the cone (13) with the slip (14) inside is installed outside the central pipe (12), the reset spring (15) is installed at the lower end of the cone (13) and between the central pipe (12) and the slip (14); the lower end of the slip (14) is connected with the slip block (16) through the telescopic slip groove, the slip block (16), the track joint (17) and the track pipe (21) are connected in sequence from top to bottom; the centralizing body (22) with the centralizing block (20) and the centralizing spring is installed outside the track pipe (21), the upper part of the track pipe (21) is provided with a setting track and the lower part is provided with a centralizing mechanism moving groove; the track pin (19) installed in the central pipe (12) is connected with the setting track in the track pipe (21), the anti-rotation pin (24) in the centralizing body (22) is connected with the centralizing mechanism moving groove in the track pipe (21); the traction pin (25) in the lower joint (26) is connected with the annular groove in the centralizing body (22); the stop ball cover (2), the connecting pipe (9), the transition joint (10), the central pipe (12) and the lower joint (26) are connected in sequence from top to bottom, and the transition joint (10), the tension sleeve (11) and the central pipe (12) are gap fitted. ​ 2. A retestable pressure-tested anchor for a screw pump anchor assembly as defined in claim 1, characterized in that The inner cavity of the stop ball cover (2) is a non-equal-diameter inner cavity and is provided with an inner clamping table in the middle part, the inner circle and the outer circle below the inner clamping table are provided with sealing rings, and the lower inner circle of the stop ball cover (2) is provided with an inner thread and is threadedly connected with the connecting pipe (9); the valve seat (4) is installed between the inner clamping table and the connecting pipe (9), and the connecting pipe (9) clamps the valve seat (4) below the inner clamping table; the upper inner circle of the valve seat (4) is provided with an inner chamfer.

3. A retestable pressure-tested anchor for a screw pump anchor assembly as defined in claim 2, characterized in that The upper outer circle of the connecting pipe (9) is a non-equal-diameter outer circle and is provided with an outer clamping table, the lower outer circle of the outer clamping table is a conical surface, and the conical surface is matched with the conical surface of the inner circle of the upper end of the transmission joint (7); the outer diameter of the lower outer circle of the connecting pipe (9) is consistent with the inner diameter of the transmission joint (7).

4. A retestable pressure-tested anchor for a screw pump anchor assembly as defined in claim 3, characterized in that The ejector rod (6) is a solid rod and is provided with a liquid flow through step on the outer circle of the upper rod body, and more than three liquid flow holes are arranged in the liquid flow through step; a screw hole is arranged at the lower end of the rod body of the ejector rod (6) and is connected with the transmission rod (8) welded at the other end in the transmission joint (7) through the screw hole; the number of the transmission rod (8) connected between the transmission joint (7) and the ejector rod (6) is consistent with the number of the pressure testing grooves in the connecting pipe (9).

5. A retestable pressure-tested anchor for a screw pump anchor assembly as defined in claim 1 wherein, The upper inner circle step of the tension sleeve (11) is suspended on the lower outer circle step of the transition joint (10) and is threadedly connected with the cone (13), and the lower end of the tension sleeve (11) abuts against the upper outer circle step of the cone (13); a thrust bearing or a ball is arranged in the concave surface on the outer periphery of the central hole of the upper end of the cone (13).

6. A retestable pressure-tested anchor for a screw pump anchor assembly as defined in claim 1 wherein, The setting track is a spiral track penetrating the track pipe (21) body, the spiral angle of the spiral track is 45 degrees and is arranged in the pipe body of 20%-30% of the circumference of the track pipe (21); one end of the track pin (19) is threadedly connected in the screw hole of the central pipe (12), the outer circle of the other end can be fitted with a shaft sleeve or sliding bearing smaller than the width of the setting track groove body and the end of the track pin (19) with the shaft sleeve or sliding bearing is installed in the setting track in the track pipe (21).

7. A retestable pressure-tested anchor for a screw pump anchor assembly as defined in claim 1 wherein, The righting springs in the righting mechanism are provided with two kinds of righting coil springs (20-1) and righting leaf springs (20-2), the righting coil springs (20-1) and the righting leaf springs (20-2) are alternately installed in the righting blocks (20) in the righting body (22); the two ends of the righting blocks (20) are respectively installed in the embedded grooves of the righting body (22) through the press rings (18) and the pin stop rings (23) threadedly connected with the righting body (22).

8. A retestable pressure-tested anchor for a screw pump anchor assembly as defined in claim 7, characterized in that The axial length of the pin stop ring (23) connected below the righting block (20) is greater than the installation position of the anti-rotation pin (24); the anti-rotation pins (24) in the righting body (22) are provided in two or more; the traction pins (25) connected in the annular grooves in the lower outer circle of the righting body (22) are provided in two or more.

9. A retestable pressure-tested anchor for a screw pump anchor assembly as defined in claim 1 wherein, The axial length of the pressure testing groove in the connecting pipe (9) is consistent with the axial length of the righting mechanism moving groove in the track pipe (21).

10. A retestable pressure-tested anchor for a screw pump anchor assembly as defined in claim 1, wherein, The two ends of the valve sleeve (5) are respectively threadedly connected with the upper joint (1) and the transmission joint (7) and are threadedly connected with the tubing string through the upper joint (1); the stop ball cover (2), the connecting pipe (9), the transition joint (10), the central pipe (12) and the lower joint (26) are sequentially threadedly connected.

11. A retestable pressure-tested anchor for a screw pump anchor device as claimed in any one of claims 1 to 10, characterized in that The method comprises the following steps: a. Setting; b. Pressure testing preparation; c. Pressure testing; d. Unsetting; e. Pressure relief; f. Tubing string continues to go downhole.

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