Sleeve type anti-eccentric-wear oil pipe pup joint assembly

Abstract

A sleeved type anti-eccentric-wear oil pipe pup joint assembly comprises an oil pipe pup joint outer sleeve, and annular clamping grooves are symmetrically formed in the positions, close to the two ends, of an inner hole of the oil pipe pup joint outer sleeve. Positioning sleeves are inserted into the two ends in the oil pipe pup joint outer sleeve respectively, an inner hole of each positioning sleeve is in a step shape, a plurality of open grooves are evenly distributed in the circumference of the small hole end of each positioning sleeve, and an annular boss is arranged at the end, close to the small hole, of the outer edge of each positioning sleeve and clamped in the corresponding annular clamping groove. End bushings are respectively inserted into the inner holes of the positioning sleeves at the ends of the large holes, and the inner ends of the end bushings are provided with conical openings and are tightly attached to the shoulders of the inner holes of the positioning sleeves; a middle lining is embedded between the two positioning sleeves in the oil pipe pup joint outer sleeve, the two ends of the middle lining are tightly attached to the end linings, the inner diameters of the two ends of the middle lining and the end linings are consistent, and the middle lining and the end linings are made of abrasion-resistant, oil-resistant and temperature-resistant materials and used for avoiding contact friction between the sucker rod and an oil pipe. The device has the beneficial effects that direct eccentric wear between the sucker rod and the oil pipe can be prevented, and oil leakage caused by wear of the oil pipe and rod breakage caused by fine grinding of the sucker rod are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of oil exploitation, especially a sleeved type anti-deviation wear oil pipe short connection assembly. BACKGROUND

[0002] In the process of oil exploitation, the phenomenon of deviation wear between the sucker rod and the oil pipe often occurs, once the oil pipe is worn out, the pumping unit will only rotate without oil, and the broken rod accident will also occur when the sucker rod is worn out, so the deviation wear phenomenon brings great harm to oil production. In order to solve the above problems, people mainly use the installation of centralizers on the sucker rod to avoid the occurrence of deviation wear. However, due to the structural characteristics of the sucker rod, it is troublesome to install the centralizer, and it is difficult to accurately fix the installation position of the centralizer at the place where the deviation wear occurs, which is time-consuming and laborious, and the deviation wear phenomenon still occurs sometimes even if the centralizer is installed on the sucker rod. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide a sleeved type anti-deviation wear oil pipe short connection assembly which can prevent the direct deviation wear between the sucker rod and the oil pipe, so as to avoid the wear and leakage of the oil pipe and the broken rod of the sucker rod.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A sleeved type anti-deviation wear oil pipe short connection assembly, which comprises an oil pipe short connection outer sleeve, annular clamping grooves are symmetrically arranged in the inner hole of the oil pipe short connection outer sleeve near the two ends; positioning sleeves are respectively inserted in the inner hole of the oil pipe short connection outer sleeve at the two ends, the inner hole of the positioning sleeve is in a stepped shape and a plurality of open grooves are uniformly distributed on the circumference of the small hole end of the positioning sleeve, an annular boss is arranged on the outer edge of the positioning sleeve near the small hole end, and the annular boss is clamped in the corresponding annular clamping groove.

[0006] End bushings are respectively inserted in the inner hole of the positioning sleeve at the large hole end, a tapered port is arranged at the inner end of the end bushing and tightly abuts against the shoulder of the inner hole of the positioning sleeve; a middle bushing is embedded in the oil pipe short connection outer sleeve between the two positioning sleeves, the middle bushing tightly abuts against the end bushings at the two ends and has the same inner diameter, the middle bushing and the end bushing are made of wear-resistant, oil-resistant and temperature-resistant materials, and are used for avoiding the contact friction between the sucker rod and the oil pipe.

[0007] As a further optimization, the cross sections of the annular clamping grooves and the annular boss are wedge-shaped and matched with each other, so that the positioning sleeve cannot be actively separated after being clamped.

[0008] As a further optimization, the outer port of the positioning sleeve is a tapered port, so as to facilitate the insertion of the sucker rod.

[0009] As a further optimization, the middle bushing and the end bushing are made of polytetrafluoroethylene, nylon or polyurethane material.

[0010] As a further preference, the length of the tubing spool jacket is 300-500 mm.

[0011] As a further preference, a tubing coupling is threadedly connected to each end of the tubing spool jacket to facilitate installation and use.

[0012] The present application has the following advantages:

[0013] Since the end bushing and the intermediate bushing are clamped by the positioning sleeves at both ends in the tubing spool jacket, when the sucker rod reciprocates in the tubing, the sucker rod can only rub against the end bushing and the intermediate bushing, and the tubing will not be abraded, thereby avoiding the tubing from being abraded and leaking, and the sucker rod from being abraded and broken. Moreover, since the end bushing and the intermediate bushing are made of wear-resistant, oil-resistant and temperature-resistant materials, and the materials are softer than the sucker rod, the sucker rod will not be abraded, and only the end bushing and the intermediate bushing can be abraded. When the end bushing and the intermediate bushing are abraded to a certain extent, the end bushing and the intermediate bushing in the tubing spool assembly that has been abraded can be replaced during the tubing pulling operation, and the tubing spool assembly is convenient to disassemble and assemble, thereby solving the problem of damage to the sucker rod and the tubing caused by eccentric wear. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 is a structural schematic view of the present application;

[0015] Fig. 2 is a structural schematic view of the tubing spool jacket.

[0016] Fig. 3 is a structural schematic view of the positioning sleeve.

[0017] In the drawing: tubing coupling 1, positioning sleeve 2, end bushing 3, intermediate bushing 4, tubing spool jacket 5, annular clamping groove 501, annular boss 201, open slot 202, shoulder 203. DETAILED DESCRIPTION

[0018] As shown in Figs. 1-3 the present application relates to a sleeved eccentric wear prevention tubing spool assembly, which comprises a tubular tubing spool jacket 5, two annular clamping grooves 501 are symmetrically arranged in the inner hole of the tubing spool jacket 5 near both ends; a positioning sleeve 2 is inserted and clamped in the tubing spool jacket 5 at both ends through gap cooperation, the inner hole of the positioning sleeve 2 is stepped, and a plurality of open slots 202 are circumferentially and uniformly arranged on the tube wall of the small hole end of the positioning sleeve 2, each open slot is arranged along the axial direction of the positioning sleeve 2, so that the small hole end of the positioning sleeve 2 has a certain elastic deformation amount. An annular boss 201 is arranged on the outer edge of the positioning sleeve 2 near the small hole end, the annular boss is clamped in the corresponding annular clamping groove 501, which is used for realizing the axial positioning of the positioning sleeve 2; the cross section of the annular clamping groove and the annular boss is wedge-shaped, so that the positioning sleeve 2 cannot be actively separated after being clamped.

[0019] The inner hole of the positioning sleeve 2 is provided with an end bushing 3 at one end of the large hole, and the end bushing 3 is provided with a tapered port at the inner end and tightly abuts the shoulder 203 in the middle of the inner hole of the positioning sleeve 2. The intermediate bushing 4 is embedded in the oil pipe short circuit sleeve 5 between the two positioning sleeves 2, and the two ends of the intermediate bushing 4 tightly abut the end bushing 3 and have the same inner diameter. The intermediate bushing 4 and the end bushing 3 are made of wear-resistant, oil-resistant and temperature-resistant materials, so as to avoid contact and friction between the sucker rod and the oil pipe.

[0020] The outer port of the positioning sleeve 2 is a tapered port, so as to facilitate the insertion of the sucker rod. The intermediate bushing 4 and the end bushing 3 are preferably made of polytetrafluoroethylene, nylon or polyurethane material.

[0021] The length of the oil pipe short circuit sleeve 5 is 300-500 mm. The oil pipe short circuit sleeve 5 is provided with pipe threads at both ends, and the oil pipe coupling 1 is connected through the threads, so as to facilitate the installation and connection.

[0022] When the oil pipe is lowered into the well, one or more oil pipe short circuit assemblies are connected at the bending positions of the oil pipe string. When the sucker rod reciprocates in the oil pipe, the sucker rod will rub against the oil pipe due to the non-coincidence of the movement track of the sucker rod and the center line of the oil pipe. However, the intermediate bushing 4 and the end bushing 3 in the oil pipe short circuit sleeve 5 make the sucker rod only rub against the bushing, without damaging the oil pipe. At the same time, since the intermediate bushing 4 and the end bushing 3 are softer than the sucker rod, the sucker rod will not be damaged, but only the intermediate bushing 4 and the end bushing 3 will be damaged. When the intermediate bushing 4 and the end bushing 3 are damaged to a certain extent, the end bushing and the intermediate bushing in the oil pipe short circuit assembly can be replaced during the oil pipe lifting operation, so as to solve the problem of damage to the sucker rod and the oil pipe caused by eccentric wear.

[0023] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A set of eccentricity-preventing oil pipe nipple assembly, comprising an oil pipe nipple jacket, characterized in that: The annular clamping grooves are symmetrically arranged near the two ends in the inner hole of the oil pipe short circuit sleeve; the positioning sleeves are respectively inserted into the oil pipe short circuit sleeve near the two ends, the inner hole of the positioning sleeve is stepped, and a plurality of open grooves are uniformly distributed on the circumference of the small hole end of the positioning sleeve; the annular protrusions are arranged on the outer edge of the positioning sleeve near the small hole end, and the annular protrusions are clamped in the corresponding annular clamping grooves; The end bushings are respectively inserted into the inner hole of the positioning sleeve near the large hole end, the inner end of the end bushing is provided with a tapered port and is tightly combined with the shoulder of the inner hole of the positioning sleeve; the intermediate bushing is embedded between the two positioning sleeves in the oil pipe short circuit sleeve, the two ends of the intermediate bushing are tightly combined with the end bushings and have the same inner diameter, the intermediate bushing and the end bushing are made of wear-resistant, oil-resistant and temperature-resistant materials, and are used for avoiding contact friction between the sucker rod and the oil pipe.

2. The set of eccentricity-preventing oil pipe pup joint components according to claim 1, characterized in that: The cross sections of the annular clamping grooves and the annular protrusions are wedge-shaped and matched with each other, so that the positioning sleeve cannot be actively separated after being clamped.

3. A set of eccentricity-preventing oil pipe pup joint components according to claim 1 or 2, characterized in that: The outer port of the positioning sleeve is a tapered port, so as to facilitate the insertion of the sucker rod.

4. The set of eccentricity-preventing oil pipe pup joint components according to claim 1, characterized in that: The intermediate bushing and the end bushing are made of polytetrafluoroethylene, nylon or polyurethane material.

5. The set of eccentricity-preventing oil pipe pup joint components according to claim 1, characterized in that: The length of the oil pipe short circuit sleeve is 300-500 mm.

6. The set of eccentricity-preventing oil pipe pup joint components according to claim 1 or 5, characterized in that: The oil pipe couplings are respectively connected to the two ends of the oil pipe short circuit sleeve through threads, so as to facilitate the installation and use.

Images