A multiple seal premium thread tubing spool

Abstract

The utility model relates to a kind of multiple sealing premium thread oil pipe nipple, relate to oil exploitation facility technical field.The nipple body is inserted into hole below central hole, the inner diameter of inserted into hole is matched with the clearance of connected oil pipe, two inner annular grooves are opened in inserted into hole, O type sealing ring is installed in inner annular groove, the nipple body is opened in advance hole in inserted into hole lower part, the nipple body is equipped with force tube in advance hole lower part, outer cone sleeve and inner cone sleeve are installed in advance hole, the outer circle of outer cone sleeve is matched with the clearance of advance hole.The beneficial effects of the utility model are that the connecting part of oil pipe nipple and oil pipe is sealed by O type sealing ring, rubber pad is used for auxiliary sealing and buffering oil pipe, elastic inner cone sleeve is arranged between outer annular groove B of oil pipe and nipple body to bear tension, installation and disassembly can be completed by rotating gear ring, and the strength of oil pipe itself is not damaged during quick installation and disassembly, and limiting sleeve and positioning sleeve are circumferentially locked by self-locking advance sleeve, so the locking is firm.

Description

Technical Field

[0001] This invention relates to the field of oil extraction facility technology, and in particular to a multi-seal special threaded oil pipe short section. Background Technology

[0002] Short sections are divided into tubing short sections and casing short sections, and are a commonly used fitting in industrial pipeline connections. Common types include threaded short sections, which are divided into double-ended male thread, single-ended male thread, and flat-ended male thread short sections. Existing tubing short sections connect both ends of the tubing through tapered pipe threads. Machining tapered pipe threads on the tubing inevitably reduces the strength of the tubing body. When using tubing short sections, frequent disassembly and assembly are required, and repeated disassembly and assembly cause thread wear, reducing the sealing performance at the connection between the short section and the tubing. Summary of the Invention

[0003] To address the problems of low strength and unreliable connection in existing oil pipe short sections, this invention provides a multi-seal special threaded oil pipe short section.

[0004] The technical solution provided by this invention is: a multi-seal special threaded oil pipe short section, including a short section body, a central hole at the center of the short section body, the diameter of the central hole being equal to the inner diameter of the connected oil pipe, the short section body having a symmetrical structure on both sides above and below the central hole, an insertion hole below the central hole on the short section body, the inner diameter of the insertion hole being clearance-fitted with the connected oil pipe, two inner annular grooves being opened in the insertion hole, an O-ring being installed in the inner annular groove, a push hole being opened below the insertion hole on the short section body, a load-bearing tube being provided below the push hole on the short section body, an outer conical sleeve and an inner conical sleeve being installed in the push hole, the outer circle of the outer conical sleeve being clearance-fitted with the push hole, the inner hole of the outer conical sleeve being a conical hole, the large diameter end of the conical hole of the outer conical sleeve being located at the bottom, the outer circle of the inner conical sleeve being a conical cylinder, the outer conical sleeve and the inner conical sleeve being taperedly fitted, the inner hole of the inner conical sleeve being the same size as the insertion hole under natural conditions, a cutting slit being opened outward along one side of the axis of the inner conical sleeve, the inner conical sleeve being made of spring steel;

[0005] The load-bearing pipe has four through-holes evenly distributed around its circumference. The screws are threaded to connect to the screw rods. The upper part of the screw rod rests on the outer conical sleeve, and the lower part of the screw rod is fixedly connected to a gear. The gear meshes with and drives a gear ring on its outer side. The upper part of the gear ring is fixedly connected to a positioning sleeve by bolts. The outer circumference of the load-bearing pipe has an outer annular groove A, and the inner hole of the positioning sleeve is embedded in the outer annular groove A.

[0006] The short section body has a keyway on the upper part of the outer ring groove A. A limit sleeve is fitted on the keyway part of the short section body. A flat key is fixedly connected to the inner hole of the limit sleeve. The flat key is inserted into the keyway. A positioning hole is opened on the upper end face of the positioning sleeve. A positioning post is fixedly connected to the lower part of the limit sleeve. The positioning post is aligned with the positioning hole on the circumference. A push sleeve is threadedly connected to the upper part of the limit sleeve of the short section body. The lower part of the push sleeve abuts against the limit sleeve.

[0007] The end of the connected oil pipe is machined with an outer annular groove B.

[0008] The connecting thread between the propulsion sleeve and the short section body is a non-standard self-locking thread, and the conical engagement angle between the inner and outer conical sleeves is a non-self-locking friction angle.

[0009] When the inner cone sleeve is compressed and embedded into the outer annular groove B of the oil pipe, the upper end face of the inner cone sleeve simultaneously contacts the lower end face of the insertion hole.

[0010] After the oil pipe is inserted into the short section body, the lower end face of the insertion hole of the short section body is flush with the upper end face of the outer annular groove B of the oil pipe.

[0011] A rubber pad is attached to the lower end surface.

[0012] The propulsion sleeve is equipped with a permanent magnet ring at the connection point with the limiting sleeve.

[0013] The width of the keyway is greater than the width of the flat key.

[0014] The positioning sleeve is a structure composed of two halves combined into one piece.

[0015] The beneficial effects of this invention are as follows: This invention sets the connection between the oil pipe stub and the oil pipe to be sealed by an O-ring, with a rubber gasket assisting in the sealing and buffering of the oil pipe. An elastic inner cone sleeve is placed between the outer annular groove B of the oil pipe and the stub body to bear the tensile force. Installation and disassembly can be completed by rotating the gear ring. Installation and disassembly are quick and do not damage the strength of the oil pipe itself. The self-locking push sleeve circumferentially locks the limiting sleeve and the positioning sleeve, ensuring a secure lock. Attached Figure Description

[0016] Appendix Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Appendix Figure 2 It is attached Figure 1 AA cross-section view;

[0018] Appendix Figure 3 It is attached Figure 1 Enlarged view of point B;

[0019] Appendix Figure 4 This is a schematic diagram of the structure of the short section body in this invention;

[0020] Appendix Figure 5 This is a schematic diagram of the inner conical sleeve in this invention;

[0021] Appendix Figure 6 This is a schematic diagram of the structure of the connecting oil pipe of the present invention.

[0022] In the diagram, 1-short section body, 101-propulsion hole, 102-lower end face, 103-insertion hole, 104-center hole, 105-keyway, 106-inner ring groove, 107-outer ring groove A, 108-bearing tube, 109-screw hole, 2-inner conical sleeve, 201-cutting seam, 3-outer conical sleeve, 4-screw, 5-gear, 6-gear ring, 7-positioning sleeve, 701-positioning hole, 8-O-ring seal, 9-rubber pad, 10-oil pipe, 1001-outer ring groove B, 11-limiting sleeve, 1101-flat key, 12-propulsion sleeve, 13-permanent magnet ring, 14-positioning post. Detailed Implementation

[0023] like Figures 1-6 As shown, a multi-seal special threaded oil pipe short section includes a short section body 1. The short section body 1 has a central hole 104 at its center, the diameter of which is equal to the inner diameter of the connected oil pipe 10. The short section body 1 has a symmetrical structure on both sides of the central hole 104. Below the central hole 104, the short section body 1 has a insertion hole 103. The inner diameter of the insertion hole 103 is clearance-fitted with the connected oil pipe 10. Two inner annular grooves 106 are formed within the insertion hole 103, and O-ring seals 8 are installed within the inner annular grooves 106. The short section body 1 has a insertion hole 103... The lower part has a push hole 101. The short section body 1 has a bearing tube 108 at the lower part of the push hole 101. An outer conical sleeve 3 and an inner conical sleeve 2 are installed in the push hole 101. The outer circle of the outer conical sleeve 3 is clearance-fitted with the push hole 101. The inner hole of the outer conical sleeve 3 is a conical hole. The large diameter end of the conical hole of the outer conical sleeve 3 is located at the lower part. The outer circle of the inner conical sleeve 2 is a conical cylinder. The outer conical sleeve 3 and the inner conical sleeve 2 are tapered. The inner hole of the inner conical sleeve 2 is the same size as the insertion hole 103 under natural conditions. The inner conical sleeve 2 has a cutting slit 201 on one side of the axis. The inner conical sleeve 2 is made of spring steel.

[0024] The load-bearing tube 108 has four through-holes 109, which are evenly distributed around the circumference of the load-bearing tube 108. The screw 4 is threaded into the screw 109. The upper part of the screw 4 rests on the outer tapered sleeve 3. The lower part of the screw 4 is fixedly connected to the gear 5. The gear 5 is meshed with the gear ring 6 on the outside. The upper part of the gear ring 6 is fixedly connected to the positioning sleeve 7 by bolts. The outer circle of the load-bearing tube 108 has an outer ring groove A107. The inner hole of the positioning sleeve 7 is embedded in the outer ring groove A107.

[0025] The short section body 1 has a keyway 105 on the upper part of the outer ring groove A107. The short section body 1 is fitted with a limiting sleeve 11 on the keyway 105. The inner hole of the limiting sleeve 11 is fixedly connected to a flat key 1101. The flat key 1101 is inserted into the keyway 105. The upper end face of the positioning sleeve 7 has a positioning hole 701. The lower part of the limiting sleeve 11 is fixedly connected to a positioning post 14. The positioning post 14 is circumferentially aligned with the positioning hole 701. The short section body 1 is threadedly connected to a push sleeve 12 on the upper part of the limiting sleeve 11. The lower part of the push sleeve 12 abuts against the limiting sleeve 11.

[0026] The end of the connected oil pipe 10 is machined with an outer ring groove B1001.

[0027] The thread connecting the push sleeve 12 and the short section body 1 is a non-standard self-locking thread, and the conical engagement angle between the inner conical sleeve 2 and the outer conical sleeve 3 is a non-self-locking friction angle.

[0028] When the inner cone sleeve 2 is compressed and embedded in the outer annular groove B1001 of the oil pipe 10, the upper end face of the inner cone sleeve 2 is simultaneously in contact with the lower end face 102 of the insertion hole 103.

[0029] After the oil pipe 10 is inserted into the short section body 1, the lower end face 102 of the insertion hole 103 of the short section body 1 is flush with the upper end face of the outer annular groove B1001 of the oil pipe 10.

[0030] During installation, taking the lower oil pipe 10 as an example, insert the oil pipe 10 into the insertion hole 103 and seal it with the O-ring seal 8. Use a tool to fix the short section body 1, rotate the gear ring 6, the gear ring 6 drives the gear 5 to rotate, the gear 5 and the screw 4 rotate, and the screw 4 pushes the outer cone sleeve 3 upward under the action of the screw hole 109. Since the inner cone sleeve 2 cannot rise under the action of the lower end face 102, the outer cone sleeve 3 compresses the inner hole of the inner cone sleeve 2 and shrinks into the outer ring groove B1001 of the oil pipe 10. Thus, the inner cone sleeve 2 axially positions the short section body 1 and the oil pipe 10. Then rotate the push sleeve 12 and insert the positioning pin 14 on the limit sleeve 11 into the positioning hole 701 for fixation. Since the connection thread between the push sleeve 12 and the short section body 1 is a special self-locking thread, it will not re-thread without external force, making installation quick and the connection and sealing reliable.

[0031] A rubber gasket 9 is bonded to the lower end face 102, which serves as an auxiliary seal and buffer oil pipe 10.

[0032] The push sleeve 12 is provided with a permanent magnet ring 13 at the connection with the limiting sleeve 11. When the oil pipe 10 is disassembled, the push sleeve 12 drives the limiting sleeve 11 to move through magnetic force, bringing the positioning pin 14 out of the positioning sleeve 7, rotating the gear ring 6 in the opposite direction, the screw 4 descends, and the inner cone sleeve 2 disengages from the outer ring groove B1001 of the oil pipe 10 under its own elasticity, and the oil pipe 10 can be removed.

[0033] In this invention, the connection between the oil pipe stub and the oil pipe 10 is sealed by an O-ring seal 8, with a rubber gasket 9 assisting in the sealing and buffering of the oil pipe 10. An elastic inner cone sleeve 2 is placed between the outer annular groove B1001 of the oil pipe 10 and the stub body 1 to bear the tensile force. Installation and disassembly can be completed by rotating the gear ring 6. Installation and disassembly are quick and do not damage the strength of the oil pipe 10 itself. The self-locking push sleeve 12 circumferentially locks the limiting sleeve 11 and the positioning sleeve 7, ensuring a secure lock.

[0034] The width of the keyway 105 is greater than the width of the flat key 1101, which allows the positioning pin 14 to be inserted into the positioning hole 701 within a certain range when the inner tapered sleeve 2 is embedded in the outer ring groove B1001, thus reducing the overall machining accuracy.

[0035] In order to install the positioning sleeve 7 into the outer ring groove A107, the positioning sleeve 7 is made into two halves that are integrated into one structure.

Claims

1. A multi-seal special threaded oil pipe short section, comprising a short section body (1), characterized in that: The short section body (1) has a central hole (104) at its center. The diameter of the central hole (104) is equal to the inner diameter of the connected oil pipe (10). The short section body (1) has a symmetrical structure on both sides of the central hole (104). The short section body (1) has a plug hole (103) below the central hole (104). The inner diameter of the plug hole (103) is clearance-fitted with the connected oil pipe (10). The plug hole (103) has two inner annular grooves (106). An O-ring seal (8) is installed in the inner annular grooves (106). The short section body (1) has a push hole (101) below the plug hole (103). The main body (1) has a bearing tube (108) at the lower part of the push hole (101). An outer conical sleeve (3) and an inner conical sleeve (2) are installed in the push hole (101). The outer circle of the outer conical sleeve (3) is clearance-fitted with the push hole (101). The inner hole of the outer conical sleeve (3) is a conical hole. The large diameter end of the conical hole of the outer conical sleeve (3) is located at the lower part. The outer circle of the inner conical sleeve (2) is a conical cylinder. The outer conical sleeve (3) and the inner conical sleeve (2) are taper-fitted. The inner hole of the inner conical sleeve (2) is the same size as the insertion hole (103) under natural conditions. The inner conical sleeve (2) has a cutting slit (201) on one side of the axis. The inner conical sleeve (2) is made of spring steel. The load-bearing tube (108) has four through-holes (109) evenly distributed around the circumference of the load-bearing tube (108). The screw holes (109) are threaded to the screw rod (4). The upper part of the screw rod (4) rests on the outer cone sleeve (3). The lower part of the screw rod (4) is fixedly connected to the gear (5). The gear (5) meshes with the gear ring (6) on the outside. The upper part of the gear ring (6) is fixedly connected to the positioning sleeve (7) by bolts. The outer circle of the load-bearing tube (108) has an outer ring groove A (107). The inner hole of the positioning sleeve (7) is embedded in the outer ring groove A (107). The short section body (1) has a keyway (105) on the upper part of the outer ring groove A (107). The short section body (1) is fitted with a limiting sleeve (11) on the keyway (105). The inner hole of the limiting sleeve (11) is fixedly connected to a flat key (1101). The flat key (1101) is inserted into the keyway (105). The upper end face of the positioning sleeve (7) has a positioning hole (701). The lower part of the limiting sleeve (11) is fixedly connected to a positioning post (14). The positioning post (14) is positioned on the circumference corresponding to the positioning hole (701). The short section body (1) is threadedly connected to a push sleeve (12) on the upper part of the limiting sleeve (11). The lower part of the push sleeve (12) abuts against the limiting sleeve (11). The end of the connected oil pipe (10) is machined with an outer annular groove B (1001).

2. The multi-seal special threaded oil pipe short section according to claim 1, characterized in that: The connecting thread between the push sleeve (12) and the short section body (1) is a non-standard self-locking thread, and the conical engagement angle between the inner conical sleeve (2) and the outer conical sleeve (3) is a non-self-locking friction angle.

3. The multi-seal special threaded oil pipe short section according to claim 1, characterized in that: When the inner cone sleeve (2) is compressed and embedded in the outer annular groove B (1001) of the oil pipe (10), the upper end face of the inner cone sleeve (2) is simultaneously connected to the lower end face (102) of the insertion hole (103); After the short section body (1) is inserted into the oil pipe (10), the lower end face (102) of the insertion hole (103) of the short section body (1) is flush with the upper end face of the outer annular groove B (1001) of the oil pipe (10).

4. The multi-seal special threaded oil pipe short section according to claim 1, characterized in that: A rubber pad (9) is adhered to the lower end face (102).

5. The multi-seal special threaded oil pipe short section according to claim 1, characterized in that: The push sleeve (12) is provided with a permanent magnet ring (13) at the connection part with the limiting sleeve (11).

6. The multi-seal special threaded oil pipe short section according to claim 1, characterized in that: The width of the keyway (105) is greater than the width of the flat key (1101).

7. The multi-seal special threaded oil pipe short section according to claim 1, characterized in that: The positioning sleeve (7) is a structure composed of two halves.

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