A threaded joint for a casing or tubing

Abstract

The utility model relates to the technical field of oil casing and discloses a threaded joint of oil casing, which comprises an external threaded joint, an internal threaded joint, a first hexagonal pipe and a second hexagonal pipe, the first hexagonal pipe is provided with a thick adapter pipe on the outside, the thick adapter pipe is provided with a first external thread convex on the outer surface, the thick adapter pipe is provided with a thin adapter pipe at the end far from the first hexagonal pipe, the thin adapter pipe is provided with a second external thread convex on the outer surface, the second hexagonal pipe is provided with an outer sleeve that is threadedly connected with the thick adapter pipe and the thin adapter pipe on the outside, the inner part of the end of the outer sleeve close to the second hexagonal pipe is provided with a fine hole channel, and the inner part of the end of the outer sleeve far from the second hexagonal pipe is provided with a thick hole channel. When the first external thread convex is screwed into the second thread groove, the second external thread convex can be screwed into the first thread groove at the same time, that is, when the thick adapter pipe is screwed into the thick hole channel, the thin adapter pipe is screwed into the fine hole channel at the same time, so that the synchronization of the two is realized, and time and labor are saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of oil casing, specifically is a threaded joint of oil casing. BACKGROUND

[0002] Oil casing is the last layer of casing in the oil and gas well casing program, from the wellhead to the oil and gas layer below, which plays an important role in protecting the well wall, isolating the oil and gas layer from the wellbore, preventing the invasion of the formation fluid into the wellbore, and providing a channel for oil and gas exploitation.

[0003] The threaded joint of the oil casing is an important part, responsible for connecting the oil casing, ensuring the integrity and function of the oil and gas well, the existing internal thread joint and shoulder thread joint used by the oil casing have poor sealing performance, and the installation and disassembly steps are relatively cumbersome, time-consuming and labor-intensive; and the overall tensile and folding resistance of the threaded joint of the existing oil casing is poor, and the connection is easy to damage under high pressure and high strength, therefore, a threaded joint of oil casing is needed to solve the above problems. SUMMARY

[0004] In view of the deficiencies of the prior art, the utility model provides a threaded joint of oil casing, which solves the problems mentioned in the background.

[0005] The utility model provides the following technical scheme: a threaded joint of oil casing, including outer thread joint and inner thread joint, be provided with first hexagonal pipe on the outer thread joint, be provided with second hexagonal pipe on the inner thread joint, the first hexagonal pipe outside is provided with thick joint pipe, the thick joint pipe outer surface is provided with first outer thread convex, the thick joint pipe is provided with thin joint pipe away from the first hexagonal pipe one end, the thin joint pipe outer surface is provided with second outer thread convex, the second hexagonal pipe outside is provided with the outer sleeve pipe of thread connection with thick joint pipe and thin joint pipe.

[0006] Preferably, the inner part of the outer sleeve pipe close to the second hexagonal pipe one end is opened as a fine hole, and the inner part of the outer sleeve pipe away from the second hexagonal pipe one end is opened as a coarse hole.

[0007] Preferably, the inner wall of the fine hole is provided with a first thread groove matched with the second outer thread convex, and the inner wall of the coarse hole is provided with a second thread groove matched with the first outer thread convex.

[0008] Preferably, a V-shaped groove is formed on the side wall of the connection between the thick joint pipe and the thin joint pipe.

[0009] Preferably, a clasp matched with the V-shaped groove is arranged on the side wall of the connection between the fine hole and the coarse hole.

[0010] Preferably, a first hexagonal pipe is provided with a slot for inserting the front end of the outer sleeve pipe.

[0011] Preferably, the first hexagonal pipe and the second hexagonal pipe are provided with a reinforcing member, the reinforcing member comprises a pull rod, a clamping block and a fixing screw, the first hexagonal pipe and the second hexagonal pipe are respectively clamped at two ends of the pull rod, and the clamping block is fixedly arranged at one end of the pull rod close to the first hexagonal pipe.

[0012] Preferably, the fixing screw is arranged at one end of the pull rod away from the clamping block, a clamping groove is formed in the first hexagonal pipe and matched with the clamping block, and a threaded hole is formed in the second hexagonal pipe and matched with the fixing screw.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The threaded joint of the oil casing, by setting up the fine hole, can supply the fine pipe to enter, by setting up the coarse hole, can supply the coarse pipe to enter, when the first outer thread convexity rotates into the second thread groove, the second outer thread convexity can rotate into the first thread groove, namely the coarse pipe rotates into the coarse hole inside, the fine pipe rotates into the fine hole simultaneously, realizes the synchronization of both, saves time and labor, after the outer thread joint and the inner thread joint are connected, the snap ring can be clamped into the V-shaped groove, guarantees the sealing property of the connecting place.

[0015] 2. The threaded joint of the oil casing, by setting up the reinforcing member, when the outer thread joint and the inner thread joint are connected, the outer sleeve front end of the inner thread joint can be clamped into the insertion slot, further guaranteeing the sealing property of the outer sleeve end portion, installing the pull rod and tightening the fixing screw, the clamping block of the reinforcing member can pass through the clamping groove and press the end portion of the outer sleeve, guaranteeing the stability of the pull rod, and strengthening the tensile and folding resistance of the threaded joint. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the whole structure schematic view of the threaded joint of the oil casing of the utility model;

[0017] Figure 2 It is the installation structure schematic view of the inner and outer thread joints and the reinforcing member of the utility model;

[0018] Figure 3 It is the structure schematic view of the outer thread joint of the utility model;

[0019] Figure 4 It is the sectional view of the outer thread joint of the utility model;

[0020] Figure 5 It is the structure schematic view of the inner thread joint of the utility model;

[0021] Figure 6 It is the sectional view of the whole structure of the threaded joint of the oil casing of the utility model.

[0022] In the figure: 1, external thread joint; 101, first hexagonal pipe; 102, clamping groove; 2, internal thread joint; 201, second hexagonal pipe; 202, threaded hole; 3, thick adapter; 301, first external thread protrusion; 4, thin adapter; 401, second external thread protrusion; 5, V-shaped groove; 6, insertion groove; 7, sleeve pipe; 701, thin hole; 702, thick hole; 703, clamping ring; 8, reinforcing piece; 801, pull rod; 802, clamping block; 803, fixing screw. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0024] Please refer to Figures 1-6 A threaded joint of an oil casing pipe comprises an external thread joint 1 and an internal thread joint 2. The external thread joint 1 is provided with a first hexagonal pipe 101, and the internal thread joint 2 is provided with a second hexagonal pipe 201. The first hexagonal pipe 101 is provided with a thick adapter 3 outside, and the thick adapter 3 is provided with a first external thread protrusion 301 on the outer surface. The thick adapter 3 is provided with a thin adapter 4 at the end away from the first hexagonal pipe 101, and the thin adapter 4 is provided with a second external thread protrusion 401 on the outer surface. The second hexagonal pipe 201 is provided with a sleeve pipe 7 outside which is threadedly connected with the thick adapter 3 and the thin adapter 4.

[0025] The internal end of the sleeve pipe 7 close to the second hexagonal pipe 201 is provided with a thin hole 701, and the internal end of the sleeve pipe 7 away from the second hexagonal pipe 201 is provided with a thick hole 702. The thin hole 701 is provided for the thin adapter 4 to enter, and the thick hole 702 is provided for the thick adapter 3 to enter.

[0026] The inner wall of the thin hole 701 is provided with a first thread groove matched with the second external thread protrusion 401, and the inner wall of the thick hole 702 is provided with a second thread groove matched with the first external thread protrusion 301. When the external thread joint 1 and the internal thread joint 2 are connected in rotation, the first external thread protrusion 301 is screwed into the second thread groove, and the second external thread protrusion 401 is screwed into the first thread groove at the same time. When the thick adapter 3 is screwed into the thick hole 702, the thin adapter 4 is screwed into the thin hole 701 at the same time, so that the two adapters are screwed in synchronously, saving time and labor.

[0027] The V-shaped groove 5 is arranged on the side wall of the connection between the thick pipe 3 and the thin pipe 4, the clamping ring 703 is arranged on the side wall of the connection between the thin hole 701 and the thick hole 702, and the clamping ring 703 is matched with the V-shaped groove 5. After the external thread joint 1 is rotationally connected with the internal thread joint 2, the clamping ring 703 can be clamped into the V-shaped groove 5, so that the sealing property of the connection is ensured.

[0028] The first hexagonal pipe 101 is internally provided with the insertion groove 6 for inserting the front end of the sleeve pipe 7. When the external thread joint 1 is connected with the internal thread joint 2, the front end of the sleeve pipe 7 of the internal thread joint 2 can be clamped into the insertion groove 6, so that the sealing property of the connection is further ensured, and meanwhile, the front end of the sleeve pipe 7 clamped into the insertion groove 6 can be matched with the reinforcing part 8, and the clamping block 802 of the reinforcing part 8 can be pressed against the end of the sleeve pipe 7 through the clamping groove 102.

[0029] The first hexagonal pipe 101 and the second hexagonal pipe 201 are provided with the reinforcing part 8. The reinforcing part 8 comprises the pull rod 801, the clamping block 802 and the fixing screw 803. The first hexagonal pipe 101 and the second hexagonal pipe 201 are respectively clamped with the two ends of the pull rod 801. The clamping block 802 is fixedly arranged at the end of the pull rod 801 close to the first hexagonal pipe 101. The fixing screw 803 is arranged at the end of the pull rod 801 away from the clamping block 802. The first hexagonal pipe 101 is provided with the clamping groove 102 matched with the clamping block 802. The second hexagonal pipe 201 is provided with the threaded hole 202 matched with the fixing screw 803. When the external thread joint 1 is connected with the internal thread joint 2, the front end of the sleeve pipe 7 of the internal thread joint 2 can be clamped into the insertion groove 6. While the sealing property of the end of the sleeve pipe 7 is further ensured, the pull rod 801 is installed and the fixing screw 803 is screwed, the clamping block 802 of the reinforcing part 8 can be pressed against the end of the sleeve pipe 7 through the clamping groove 102, so that the stability of the pull rod 801 is ensured, and the tensile and folding resistance of the threaded joint is enhanced.

[0030] The working principle is that the thin hole 701 is arranged to allow the thin pipe 4 to enter, and the thick hole 702 is arranged to allow the thick pipe 3 to enter. When the first external thread protrusion 301 is screwed into the second thread groove, the second external thread protrusion 401 can be simultaneously screwed into the first thread groove, that is, when the thick pipe 3 is screwed into the thick hole 702, the thin pipe 4 is simultaneously screwed into the thin hole 701, so that the synchronization of the two is realized, time and labor are saved, and after the external thread joint 1 is rotationally connected with the internal thread joint 2, the clamping ring 703 can be clamped into the V-shaped groove 5, so that the sealing property of the connection is ensured.

[0031] Further, when the external thread joint 1 is connected with the internal thread joint 2, the outer sleeve 7 of the internal thread joint 2 can be clamped into the slot 6, the end sealing of the outer sleeve 7 is further ensured, the pull rod 801 is installed and the fixing screw 803 is screwed, the clamping block 802 of the reinforcing part 8 can press the end of the outer sleeve 7 through the clamping slot 102, the stability of the pull rod 801 is ensured, and the tensile and folding resistance of the threaded joint is strengthened.

[0032] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A threaded joint of a casing or tubing pipe comprising an external threaded joint (1) and an internal threaded joint (2), characterized in that, The outer threaded joint (1) is provided with a first hexagonal pipe (101), the inner threaded joint (2) is provided with a second hexagonal pipe (201), the first hexagonal pipe (101) is provided with a rough joint pipe (3) outside, the rough joint pipe (3) is provided with a first outer thread convex (301) on the outer surface, the rough joint pipe (3) is provided with a fine joint pipe (4) away from the first hexagonal pipe (101), the fine joint pipe (4) is provided with a second outer thread convex (401) on the outer surface, the second hexagonal pipe (201) is provided with a sleeve pipe (7) outside which is threadedly connected with the rough joint pipe (3) and the fine joint pipe (4).

2. A threaded joint for oil country tubular goods as defined in claim 1, wherein, The sleeve pipe (7) is internally provided with a fine hole channel (701) near the second hexagonal pipe (201), and is internally provided with a rough hole channel (702) away from the second hexagonal pipe (201).

3. A threaded joint for oil country tubular goods as defined in claim 2, wherein, The fine hole channel (701) is internally provided with a first thread groove matched with the second outer thread convex (401), and the rough hole channel (702) is internally provided with a second thread groove matched with the first outer thread convex (301).

4. A threaded joint for oil country tubular goods as defined in claim 3, wherein, The side wall of the connection between the rough joint pipe (3) and the fine joint pipe (4) is provided with a V-shaped groove (5).

5. A threaded joint for oil country tubular goods as defined in claim 4, wherein, The side wall of the connection between the fine hole channel (701) and the rough hole channel (702) is provided with a clamping ring (703) matched with the V-shaped groove (5).

6. A threaded joint for oil country tubular goods as defined in claim 1, wherein, The first hexagonal pipe (101) is internally provided with a slot (6) for inserting the front end of the sleeve pipe (7).

7. An oilfield tubing and casing threaded joint as defined in claim 1, wherein, The first hexagonal pipe (101) and the second hexagonal pipe (201) are provided with a reinforcing part (8), the reinforcing part (8) comprises a pull rod (801), a clamping block (802) and a fixing screw (803), the first hexagonal pipe (101) and the second hexagonal pipe (201) are respectively clamped with both ends of the pull rod (801), and the clamping block (802) is fixedly arranged on the end of the pull rod (801) close to the first hexagonal pipe (101).

8. A threaded joint for oil country tubular goods as defined in claim 7, wherein, The fixing screw (803) is arranged on the end of the pull rod (801) away from the clamping block (802), the first hexagonal pipe (101) is provided with a clamping groove (102) matched with the clamping block (802), and the second hexagonal pipe (201) is provided with a thread hole (202) matched with the fixing screw (803).

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