Laminated windable oil pumping polished rod and its manufacturing method and application

Abstract

A laminated windable oil pumping polished rod and its manufacturing method and application, which are special in that: it comprises a plurality of thin steel sheets with a thickness of 0.2-0.3mm, a width of 50-75mm, and a length of ≥50m, with circular holes punched at both ends; the thin steel sheets are coated with anti-corrosion adhesive materials on both sides and neatly stacked together to form a high-strength thin steel laminate group with a tensile force of 8T-20T; the two ends of the high-strength thin steel laminate group are clamped between a laminate joint and a laminate pressure plate by fasteners passing through the circular holes; the laminate joint and the laminate pressure plate are hung; and two laminate joints are rotatably connected to a rotating male joint and a rotating female joint at one end away from the high-strength thin steel laminate group. The beneficial effects are: simple structure, low cost, flexible structure, high strength, and large tensile force; the stacked wound pumping rod is superimposed and wound on the reel, which can replace the existing rigid pumping rod in the well, and is easy to achieve dynamic sealing, no unbundling, no leakage, safe operation, good sealing, resistance to bending fatigue, and long service life; winding into a coil is convenient for transportation and storage, and the storage volume is small, which greatly reduces the size of the equipment.

Description

Technical Field

[0001] The invention relates to a novel oil production equipment in the petroleum industry, in particular to a laminated windable oil pumping polished rod and a manufacturing method and application thereof. Background Art

[0002] Most of the mechanical oil production equipment uses sucker rod pumps to pump oil. Since the length of the sucker rod is only more than 8 meters, a large number of joints must be used to connect the sucker rod for deep wells, which brings the following problems: 1. The deadweight load is very large, increasing power loss; 2. The probability of multiple joints breaking is high; 3. The large elongation of the sucker rod column reduces the pump efficiency; 4. The sucker rod lifting and lowering operation is complicated, and the pumping and maintenance time is long; 5. The short stroke and high frequency have a great negative impact on the service life of the oil pump.

[0003] Long-stroke pumping units have been put into use. Regardless of the type of long-stroke pumping unit, the continuous pumping rod is the key component to achieve the long stroke. The existing long-stroke continuous pumping rods, whether metal or non-metal, circular or rectangular in cross-section, cannot take into account all comprehensive parameters such as bending fatigue strength, tensile strength and drum size.

[0004] When the continuous sucker rod with a polymer material sheath repeatedly passes through the wellhead sealer, it is very easy to cause wear and sheathing under the action of sealing pressure, resulting in production accidents.

[0005] The reel of the circular cross-section continuous sucker rod has a large axial dimension and requires a sufficient distance to reduce the swing angle when arranged, which makes the entire device very large. Summary of the invention

[0006] The purpose of the present invention is to solve the above problems existing in the prior art and to provide a laminated windable oil pumping polished rod and a manufacturing method and application thereof.

[0007] The laminated windable oil pumping polished rod involved in the present invention is special in that it comprises a plurality of thin steel sheets with a thickness of 0.2-0.3mm, a width of 50-75mm and a length of ≥50m and circular holes punched at both ends, the thin steel sheets are coated with anti-corrosion adhesive materials on both sides and neatly stacked together to form a high-strength thin steel laminate group with a tensile force of 8T-20T, the two ends of the high-strength thin steel laminate group are clamped between a laminate joint and a laminate pressing plate by fasteners passing through the circular holes, the laminate joint and the laminate pressing plate are hung, and two laminate joints are rotatably connected to a rotating male joint and a rotating female joint at one end away from the high-strength thin steel laminate group.

[0008] Furthermore, there are at least two high-strength thin steel lamination groups, and the rotating male joint on one high-strength thin steel lamination group is connected to the rotating female joint on another adjacent high-strength thin steel lamination group through threads.

[0009] Furthermore, the swivel male joint is processed with external threads, shoulders, wrench holes and inner holes from the far end of the high-strength thin steel lamination group to the proximal end of the high-strength thin steel lamination group, and the swivel female joint is processed with internal threads, wrench holes and inner holes from the far end of the high-strength thin steel lamination group to the proximal end of the high-strength thin steel lamination group; the swivel male joint and the swivel female joint are respectively evenly distributed with multiple radial pin holes along the circumferential direction corresponding to the inner hole walls of their inner holes; the laminate joint is cylindrical at one end away from the high-strength thin steel lamination group and is respectively inserted into the inner hole of the corresponding swivel male joint and the inner hole of the corresponding swivel female joint, and annular grooves are respectively opened on the surface of the cylindrical body of the laminate joint corresponding to the positions of the radial pin holes, and pins are inserted into the corresponding annular grooves in the radial pin holes, and the rotational connection between the swivel male joint and the corresponding laminate joint, and the rotational connection between the swivel female joint and the corresponding laminate joint are respectively realized by the pins.

[0010] Furthermore, the laminate joint is provided with a lower installation platform corresponding to the installation position of the high-strength thin steel laminate group, and a hanging boss is provided on the lower installation platform close to one end of the cylinder, and a plurality of lower circular holes corresponding to the circular holes are processed on the lower installation platform; the laminate pressure plate is provided with an upper installation platform corresponding to the laminate installation position, and upper circular holes corresponding to the circular holes are processed on the upper installation platform, and the laminate pressure plate is provided with a hanging groove at the hanging boss of the laminate joint, and the tensile force is borne by the convex and concave hanging cooperation of the hanging boss and the hanging groove, thereby increasing the tensile strength.

[0011] Furthermore, the fastener includes a screw, a spring washer and a nut. After the screw is inserted into the corresponding lower circular hole, circular hole and upper circular hole, the laminate joint, the high-strength thin steel laminate group and the laminate pressure plate are fastened together through the spring washer and the nut. The screw is a headless screw and the bottom end is welded in the lower circular hole.

[0012] Furthermore, the circular holes on the thin steel sheet are arranged in a matrix on the surface of the thin steel sheet.

[0013] Furthermore, the number of the thin steel sheets is 8-15.

[0014] The manufacturing method of the laminated windable oil pumping polished rod comprises the following steps:

[0015] 1. Cut the thin steel sheet with a thickness of 0.2mm-0.3mm into strips with a width of 50mm-75mm and a length greater than or equal to 50m and punch round holes at both ends;

[0016] 2. Coating anti-corrosion adhesive material on both sides of the thin steel sheet;

[0017] 3. Stack multiple thin steel sheets neatly together to form a high-strength thin steel stack with a tensile force of 8T-20T;

[0018] 4. Place the two ends of the high-strength thin steel laminate group between the laminate joint and the laminate pressure plate and clamp them through fasteners passing through the laminate joint, the circular hole and the laminate pressure plate. The laminate joint and the laminate pressure plate are hung between them. The laminate joints at the two ends of the high-strength thin steel laminate group are away from one end of the high-strength thin steel laminate group and are respectively rotated to connect the rotating male joint and the rotating female joint.

[0019] Furthermore, in step 4, there are at least two high-strength thin steel lamination groups, wherein a rotary male joint on one high-strength thin steel lamination group and a rotary female joint on another adjacent high-strength thin steel lamination group are connected by threads.

[0020] The above-mentioned laminated windable oil pumping polished rod is applied, wherein the laminated windable oil pumping polished rod is stacked and wound on the oil pumping unit reel.

[0021] The beneficial effects of the present invention are: simple structure, low cost, flexible structure, high strength, and large tensile force; the stacked wound pumping rod is superimposed and wound on the reel, which can replace the existing rigid pumping rod in the well, and is easy to achieve dynamic sealing, no unbundling, no leakage, safe operation, good sealing, resistance to bending fatigue, and long service life; winding into a coil is convenient for transportation and storage, and the storage volume is small, which greatly reduces the volume of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the laminated windable oil pumping polished rod of the present invention;

[0023] Figure 2 yes Figure 1 A top view of

[0024] Figure 3 yes Figure 1 AA section view;

[0025] Figure 4 yes Figure 2 BB cross-sectional view;

[0026] Figure 5 yes Figure 1 Enlarged view of part C;

[0027] Figure 6 It is a schematic diagram of the structure of the swivel male joint;

[0028] Figure 7 yes Figure 6 A top view of

[0029] Figure 8 It is a structural schematic diagram of a swivel female joint;

[0030] Fig. 9 yes Figure 8 A top view of

[0031] Fig.10 It is a schematic diagram of the structure of the laminated joint;

[0032] Fig.11 yes Fig.10 A top view of

[0033] Fig.12 It is a schematic diagram of the structure of the laminated plate;

[0034] Fig.13 yes Fig.12 Bottom view of

[0035] Fig.14 It is a schematic diagram of the connection structure of the laminated winding oil pumping polished rod;

[0036] Fig.15 It is a schematic diagram of the stacked and wound structure of the laminated windable oil pumping polished rod of the present invention.

[0037] In the figure: 1. swivel male joint, 2. laminated joint, 3. laminated pressure plate, 4. fastener, 5. high-strength thin steel laminate group, 6. the swivel female joint, 7. pin, 8. laminated windable oil pumping rod, 9. reel, 101. external thread, 102. wrench mouth, 103. inner hole, 104. pin hole, 105. shoulder, 201. cylinder, 202. annular groove, 203. hanging boss, 204. install lower platform, 205. lower round hole, 303. hanging groove, 304. install upper platform, 305. upper round hole, 401. screw, 402. spring washer, 403. nut, 501. thin steel sheet, 502. round hole, 601. internal thread, 602. wrench mouth, 603. inner hole, 604. pin hole. DETAILED DESCRIPTION

[0038] The present invention is described in detail below with reference to the accompanying drawings and embodiments:

[0039] Example 1

[0040] like Figure 1 , Figure 2 , Figure 5 and Figure 7As shown, a laminated windable oil pumping polished rod comprises a thin steel sheet 501 with a thickness of 0.25 mm, a width of 65 mm, and a length of 60 m, with round holes 502 punched at both ends. Twelve thin steel sheets 501 are neatly stacked together to form a high-strength thin steel laminate group 5 with a tensile force of 15 T. The thin steel sheets 501 are coated with an anti-corrosion adhesive material (epoxy resin) on both sides. The round holes 502 at both ends of the high-strength thin steel laminate group 5 correspond to each other up and down and are clamped between the laminate joint 2 and the laminate pressing plate 3 by fasteners 4 passing through the laminate joint 2, the round holes 502 and the laminate pressing plate 3. The two laminate joints 2 are rotatably connected to a rotating male joint 1 and a rotating female joint 6 at one end away from the high-strength thin steel laminate group 5.

[0041] The circular holes 502 are arranged in a matrix on the surface of the thin steel sheet 501 and are equidistantly distributed along the length and width of the thin steel sheet 501. In this embodiment, the circular holes 502 are distributed along the length of the thin steel sheet 501 in a 3×3 pattern.

[0042] like Figure 2 , Figure 4 , Figure 6 and Figure 7 As shown, the rotary male joint 1 is processed with an external thread 101, a shoulder 105, a wrench opening 102 and an inner hole 103 from the far end of the high-strength thin steel lamination group 5 to the near end of the high-strength thin steel lamination group 5; Figure 8 and Fig. 9 As shown, the swivel female joint 6 is processed with an internal thread 601, a wrench opening 602 and an inner hole 603 from the far end of the high-strength thin steel lamination group 5 to the proximal end of the high-strength thin steel lamination group 5; the swivel male joint 1 and the swivel female joint 6 correspond to the inner hole walls of which are uniformly distributed with multiple radial pin holes 104 and 604 along the circumferential direction; Figure 1 and Fig.10 As shown, the end of the laminate joint 2 away from the high-strength thin steel laminate group 5 is a cylinder 201 and is respectively inserted into the inner hole 103 of the corresponding rotary male joint 1 and the inner hole 603 of the corresponding rotary female joint 6. An annular groove 202 is provided on the surface of the cylinder 201 corresponding to the radial pin hole 104 and the radial pin hole 604. A pin 7 is inserted into the annular groove 202 corresponding to the pin hole 104 and 604. The rotation connection between the rotary male joint 1 and the laminate joint 2, and the rotation female joint 6 and another laminate joint 2 are respectively realized through the pin 7.

[0043] like Fig.10 and Fig.11 The lamination joint 2 is provided with a mounting lower platform 204 corresponding to the lamination mounting position, and a hanging boss 203 is provided at one end of the mounting lower platform 204 close to the cylinder 201, and a plurality of lower circular holes 205 corresponding to the circular holes 502 are processed on the mounting lower platform 204; Fig.12 , Fig.13 and Figure 1 The stacking plate 3 is provided with an upper mounting platform 304 at the mounting position corresponding to the high-strength thin steel stacking group 5, and an upper circular hole 305 corresponding to the circular hole 502 is processed on the upper mounting platform 304. The stacking plate 3 is provided with a hanging groove 303 at the hanging boss 203 corresponding to the stacking joint 2, and the hanging boss 203 and the hanging groove 303 are matched with each other to bear the tensile force, thereby increasing the tensile strength.

[0044] like Figure 3 , Figure 1 The fastener 4 includes a screw 401, a spring washer 402 and a nut 403. After the screw 401 is inserted into the corresponding lower circular hole 205, circular hole 502 and upper circular hole 305, the laminate joint 2, the high-strength thin steel laminate group 5 and the laminate pressing plate 3 are fastened together through the spring washer 402 and the nut 403; the screw 401 is a headless screw and the bottom end is welded in the lower circular hole 205. The screw 40 and the nut 403 are 10.8 grade screws and nuts respectively.

[0045] like Fig.14 There are 10 high-strength thin steel lamination groups 5, among which the rotating male joint 1 on one high-strength thin steel lamination group and the rotating female joint 6 on another adjacent left high-strength thin steel lamination group are connected by threads to form a laminated windable oil pumping rod that meets the requirements of downhole operations.

[0046] like Fig.15 As shown, the laminated windable oil pumping rod 8 is stacked and wound on the oil pumping unit drum 9.

[0047] The manufacturing method of the laminated windable oil pumping polished rod comprises the following steps:

[0048] 1. Cut a 0.25 mm thick steel sheet into a long steel sheet 501 with a width of 65 mm and a length of 60 m and punch round holes 502 at both ends;

[0049] 2. Anti-corrosion adhesive material is coated on both sides of the thin steel sheet 501, and the anti-corrosion adhesive material is epoxy resin;

[0050] 3. Stack 10 thin steel sheets 501 neatly together to form a high-strength thin steel sheet stack 3 with a tensile force of 15T;

[0051] 4. Place the two ends of the high-strength thin steel laminate group 5 between the laminate joint 2 and the laminate pressure plate 3 and clamp them through the fastener 4 passing through the laminate joint 2, the circular hole 502 and the laminate pressure plate 3, and hang them between the laminate joint 2 and the laminate pressure plate 3. The laminate joints 2 at the two ends of the high-strength thin steel laminate group 5 are rotated away from the end of the high-strength thin steel laminate group 5 to connect the rotating male joint and the rotating female joint 6 respectively.

[0052] 5. If Fig.14 As shown, 10 high-strength thin steel lamination groups 5 with the same structure are connected in the following manner, wherein a rotary male joint 1 on one high-strength thin steel lamination group and a rotary female joint 6 on another adjacent high-strength thin steel lamination group are connected by threads to form a pumping rod that meets the requirements of downhole operations.

[0053] Example 2

[0054] A thin steel plate with a thickness of 0.3 mm is cut into long thin steel sheets 501 with a width of 75 mm and a length of 100 m and circular holes 502 are punched at both ends. 15 thin steel sheets 501 are stacked together to form a high-strength thin steel laminate group 5 with a tensile force of 20 T; the rest is the same as Example 1.

[0055] Example 3

[0056] A thin steel plate with a thickness of 0.2 mm is cut into thin steel sheets 501 with a width of 50 mm and a length of 50 m and circular holes 502 are punched at both ends. Eight thin steel sheets 501 are stacked together to form a high-strength thin steel laminate group 5 with a tensile force of 8 T. The number of high-strength thin steel laminate groups 5 is 20; the rest is the same as Example 1.

[0057] The above are only specific embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A laminated windable oil pumping polished rod, characterized by: It comprises a plurality of thin steel sheets with a thickness of 0.2-0.3mm, a width of 50-75mm and a length of ≥50m, with circular holes punched at both ends. The thin steel sheets are coated with anti-corrosion adhesive materials on both sides and are neatly stacked together to form a high-strength thin steel lamination group with a tensile force of 8T-20T. The two ends of the high-strength thin steel lamination group are clamped between a lamination joint and a lamination pressing plate by fasteners passing through the circular holes. The lamination joint and the lamination pressing plate are hung, and two lamination joints are rotatably connected to a rotating male joint and a rotating female joint respectively at one end away from the high-strength thin steel lamination group.

2. The laminated windable oil pumping polished rod according to claim 1 is characterized in that: There are at least two high-strength thin steel lamination groups, and the rotating male joint on one high-strength thin steel lamination group is connected to the rotating female joint on another adjacent high-strength thin steel lamination group through threads.

3. The laminated windable oil pumping polished rod according to claim 1 is characterized in that: The swivel male joint is processed with external threads, shaft shoulders, wrench openings and inner holes from the far end of the high-strength thin steel laminate group to the near end of the high-strength thin steel laminate group, and the swivel female joint is processed with internal threads, wrench openings and inner holes from the far end of the high-strength thin steel laminate group to the near end of the high-strength thin steel laminate group; the swivel male joint and the swivel female joint are respectively evenly distributed with multiple radial pin holes along the circumferential direction corresponding to the inner hole walls of their inner holes; the laminate joint is cylindrical at one end away from the high-strength thin steel laminate group and is respectively inserted into the inner holes of the corresponding swivel male joint and the inner holes of the corresponding swivel female joint, annular grooves are respectively opened on the surface of the cylindrical body of the laminate joint corresponding to the positions of the radial pin holes, and pins are inserted into the corresponding annular grooves in the radial pin holes, and the swivel male joint and the corresponding laminate joint, and the swivel female joint and the corresponding laminate joint are respectively connected in rotation by the pins.

4. The laminated windable oil pumping polished rod according to claim 1 is characterized in that: The stack joint is provided with a lower installation platform corresponding to the installation position of the high-strength thin steel stack group, and a hanging boss is provided on the lower installation platform close to one end of the cylinder, and a plurality of lower circular holes corresponding to the circular holes are processed on the lower installation platform; the stack pressure plate is provided with an upper installation platform corresponding to the stack installation position, and upper circular holes corresponding to the circular holes are processed on the upper installation platform, and a hanging groove is provided at the hanging boss of the stack pressure plate corresponding to the stack joint, and the tensile force is borne by the convex-concave hanging cooperation of the hanging boss and the hanging groove, thereby increasing the tensile strength.

5. The laminated windable oil pumping polished rod according to claim 1 is characterized in that: The fastener includes a screw, a spring washer and a nut. After the screw is inserted into the corresponding lower circular hole, circular hole and upper circular hole, the laminate joint, the high-strength thin steel laminate group and the laminate pressure plate are fastened together through the spring washer and the nut. The screw is a headless screw and the bottom end is welded in the lower circular hole.

6. The laminated windable oil pumping polished rod according to claim 1 is characterized in that: The circular holes on the thin steel sheet are arranged in a matrix on the surface of the thin steel sheet.

7. The laminated windable oil pumping polished rod according to claim 1 is characterized in that: The number of the thin steel sheets is 8 to 15.

8. The method for manufacturing a laminated windable oil pumping polished rod as claimed in claim 1, characterized in that: as follows: Step 1. Cut a thin steel sheet with a thickness of 0.2mm-0.3mm into strips with a width of 50mm-75mm and a length greater than or equal to 50m and punch round holes at both ends; Step 2. Coating anti-corrosion adhesive material on both sides of the thin steel sheet; Step 3. Stack multiple thin steel sheets neatly together to form a high-strength thin steel stack with a tensile force of 8T-20T; Step 4. Place the two ends of the high-strength thin steel lamination group between the lamination joint and the lamination pressure plate and clamp them through fasteners passing through the lamination joint, the circular hole and the lamination pressure plate, and hang them between the lamination joint and the lamination pressure plate. The lamination joints at the two ends of the high-strength thin steel lamination group are rotated away from one end of the high-strength thin steel lamination group to connect the rotating male joint and the rotating female joint respectively.

9. The method for manufacturing a laminated windable oil pumping polished rod according to claim 8, characterized in that: In step 4, there are at least two high-strength thin steel lamination groups, wherein a rotating male joint on one high-strength thin steel lamination group is connected to a rotating female joint on another adjacent high-strength thin steel lamination group via threads.

10. The application of the laminated windable oil pumping polished rod according to claim 1 is characterized in that: The laminated windable oil pumping polished rod is stacked and wound on the oil pumping unit reel.

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