A continuous tubing spiral slip type tubing threading device

Abstract

The present invention provides a continuous oil pipe spiral slip type pipe threading device. It realizes the contraction and expansion of the slip teeth (3) by the sliding of the slip teeth (3) on the inclined plane slider (1). During the pipe threading operation, the slip teeth (3) can disengage from or grip the inner wall of the oil pipe, avoiding the influence caused by slippage. When releasing the open state of the slip teeth (3), the steel ball screw can be turned to release the opening of the slip teeth (3), facilitating the removal of the spiral slip pipe threading device for the next operation, saving the process of making the connector. The steel ball at the lower end of the steel ball screw (2) is installed in the fixed ball groove (7) and moves within the fixed ball groove (7), realizing the movable connection between the guiding head (7) and the steel ball screw (2). This not only increases the movement range, making the operation simple, but also has good passability during the pipe threading operation, thus accelerating the speed of the pipe threading operation, having a high success rate, being able to adapt to the fast-paced production and construction work, and having high safety performance.

Description

Technical Field

[0001] The present invention relates to the field of oil and gas field development engineering, and particularly to a spiral slip type pipe threading device for coiled tubing. Background Art

[0002] In the process of oil and gas field production and engineering construction, coiled tubing operations are often used. Coiled tubing operation devices have been hailed as "universal operation machines" and are widely used in multiple operation fields such as oil and gas well workover, drilling, completion, logging, and gathering and transportation, running through the entire process of oil and gas exploitation, specifically including well flushing, perforation, drill and grind bridge plugs, sand washing and plug removal, acid fracturing, completion production string, etc. The installation of construction equipment for each well involves coiled tubing threading operations. However, there is no dedicated pipe threading tool in coiled tubing threading operations, which easily leads to defects such as frequent operations, high construction risks for personnel and equipment. When there is fast-paced production construction, it is easy to result in a low success rate of pipe threading. Summary of the Invention

[0003] The present invention provides a spiral slip type pipe threading device for coiled tubing, which not only has simple operation, good passability, and can ensure the success rate of pipe threading, but also has high safety performance, reducing the safety risks of personnel and equipment.

[0004] The present invention adopts the following technical solutions: A spiral slip type pipe threading device for coiled tubing mainly includes a steel ball screw at the upper end and a guide head at the lower end from top to bottom. The upper part of the steel ball screw is fixedly installed in a through hole axially provided in an inclined plane slider. A slip is provided on the inclined plane of the outer surface of the inclined plane slider. A plurality of slip teeth of the slip are connected to each other through elastic members and sleeved on the outer surface of the inclined plane slider. The plurality of slip teeth slide on the inclined plane slider. A steel ball is provided at the lower end of the steel ball screw. A fixed ball groove is provided in a fixed ball block at the upper end of the lower guide head. Before pipe threading operation, after the steel ball screw passes through the tubing head base, the steel ball at the lower end of the steel ball screw is installed in the fixed ball groove and moves in the fixed ball groove, so as to freely adjust the angle of the lower guide head. The slip completes the contraction and expansion of the plurality of slip teeth by sliding the plurality of slip teeth on the inclined plane slider, so that the slip teeth can disengage from or clamp the inner wall of the tubing during pipe threading operation. After the pipe threading operation is completed, the steel ball screw is screwed to release the expansion of the slip teeth, and the spiral slip device is removed for the next operation.

[0005] Furthermore, a retaining piece is provided between the tubing head base and the slip teeth.

[0006] Furthermore, the elastic member mainly includes a spring ring and a spring. The spring ring is located between the heads of the plurality of slip teeth, and the spring is located between the bodies of the plurality of slip teeth. The plurality of slip teeth achieve expansion and contraction through the expansion and contraction of the spring ring and the spring.

[0007] Furthermore, before the pipe threading operation, turn the thread provided at the upper end of the steel ball screw. The steel ball screw drives the inclined plane slider to move downward. After the inclined plane of the inclined plane slider moves downward, it squeezes several slip jaws, causing the several slip jaws to expand upward after being squeezed, so as to complete the expansion of the several slip jaws. After receiving the tensile force, the expanded several slip jaws tightly grip the inner wall of the oil pipe, forming a state of getting tighter and tighter when pulled, avoiding slippage. After the pipe threading operation is completed, the thread provided on the steel ball screw can be turned in the reverse direction. The steel ball screw drives the inclined plane slider to move upward. After the inclined plane of the inclined plane slider moves upward, the inclined plane is disengaged from contact with the several slip jaws, thereby releasing the expansion of the several slip jaws, and removing the spiral slip pipe threading device for the next operation.

[0008] The present invention has the following beneficial effects: After adopting the above technical solutions, the slip of the present invention completes the contraction and expansion of several slip jaws by sliding several slip jaws on the inclined plane slider, so that the slip jaws can disengage from or grip the inner wall of the oil pipe during the pipe threading operation. In this way, not only can a state of getting tighter and tighter be formed when gripping the oil pipe, avoiding the influence caused by slippage, increasing safety and reliability, but also when releasing the expanded state of the slip jaws, the steel ball screw can be turned to release the expansion of the slip jaws, which can facilitate the removal of the spiral slip pipe threading device for the next operation, eliminating the process of cutting the pipe in the next operation and saving the process of making the connector. The steel ball at the lower end of the steel ball screw is installed in the fixed ball groove and moves in the fixed ball groove, thus realizing the movable connection between the guide head and the steel ball screw. In this way, not only can the movement range be increased, making the operation simple, but also the passability is good during the pipe threading operation, thus accelerating the speed of the pipe threading operation, with a high success rate, being able to adapt to the fast-paced production and construction, and also reducing the risk of the coiled tubing pipe threading operation, with high safety performance. Several slip jaws on the slip of the present invention use springs and spring rings for expansion and tightening, which is more convenient for installation and disassembly operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0010] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] The following will elaborate on the processing embodiments of the present invention in conjunction with the drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0012] InFigure 1 In this invention, a spiral slip type pipe threading device for continuous tubing is provided. From top to bottom, it mainly includes a steel ball screw 2 at the upper end and a guide head 7 at the lower end. The upper part of the steel ball screw 2 is fixedly installed in a through hole axially provided on an inclined surface slider 1. On the inclined surface of the outer surface of the inclined surface slider 1, slips are provided. Between several slip teeth 3 of the slips, they are connected to each other through elastic members and then sleeved on the outer surface of the inclined surface slider 1. In this embodiment, the slips include three slip teeth 3, and the three slip teeth 3 slide on the inclined surface slider 1. At the lower end of the steel ball screw 2, there is a steel ball 11. In a fixed ball groove 6 provided in a fixed ball block 12 at the upper end of the lower guide head 7, a limit pin 8 is provided between the bottom of the fixed ball block 12 and the upper side surface of the upper end of the lower guide head 7. Before the pipe threading operation, after the steel ball screw 2 passes through the tubing port base 4, the steel ball 11 at the lower end of the steel ball screw 2 is installed in the fixed ball groove 6 and moves within the fixed ball groove 6, so as to freely adjust the angle of the lower guide head 7. The slips complete the contraction and expansion of the three slip teeth 3 by sliding the three slip teeth 3 on the inclined surface slider 1, so that the slip teeth 3 can disengage from or clamp the inner wall of the tubing during the pipe threading operation. After the pipe threading operation is completed, the steel ball screw 2 is rotated to release the expansion of the slip teeth 3, and the spiral slip device is removed for the next operation. In this embodiment, a retaining piece 5 is provided between the tubing port base 4 and the slip teeth 3. The elastic members in this embodiment mainly include a spring ring 10 and a spring 9. The spring ring 10 is located between the heads of the three slip teeth 3, and the spring 9 is located between the main bodies of the three slip teeth 3. The three slip teeth 3 realize expansion and contraction through the expansion and contraction of the spring ring 10 and the spring 9.

[0013] The using process of this invention is as follows: Before the pipe threading operation, the thread provided at the upper end of the steel ball screw 2 is rotated. The steel ball screw 2 drives the inclined surface slider 1 to move downward. After the inclined surface of the inclined surface slider 1 moves downward, it squeezes the three slip teeth 3, so that the slip teeth 3 expand upward after being squeezed to complete the expansion of the three slip teeth 3. The three slip teeth 3 that expand after receiving the pulling force tightly clamp the inner wall of the tubing, forming a state of getting tighter and tighter when pulled, to avoid slipping. The continuous tubing installed with the spiral slip type pipe threading device of this invention is lifted by a crane for the pipe threading operation. One end of the lower guide head 7 of the pipe threading device is inserted into the injector head, and then through the chain clamping force of the injector head, the lower guide head 7 is grasped to complete the pipe threading operation. After the pipe threading operation is completed, the thread provided on the steel ball screw 2 can be rotated in the reverse direction. The steel ball screw 2 drives the inclined surface slider 1 to move upward. After the inclined surface of the inclined surface slider 1 moves upward, the inclined surface is disengaged from contact with the three slip teeth 3, so as to release the expansion of several slip teeth 3. The steel ball screw 2 is unfastened, and the spiral slip pipe threading device is removed for the next operation.

[0014] Without being limited thereto, any changes or substitutions that are thought of without creative work should be covered within the protection scope of this invention. Therefore, the protection scope of this invention should be subject to the protection scope defined by the claims.

Claims

1. A spiral slip type pipe threading device for continuous oil pipes, characterized in that It mainly includes a ball screw (2) at the upper end and a guide head (7) at the lower end from top to bottom. The upper part of the ball screw (2) is fixedly installed in a through hole axially provided in the inclined plane slider (1). A slip-on is provided on the inclined plane of the outer surface of the inclined plane slider (1). A number of slip-on teeth (3) of the slip-on are connected to each other through elastic members and sleeved on the outer surface of the inclined plane slider (1). A number of slip-on teeth (3) slide on the inclined plane slider (1). A ball (11) is provided at the lower end of the ball screw (2). A fixed ball groove (6) is provided in a fixed ball block (12) at the upper end of the lower guide head (7). Before the pipe threading operation, after the ball screw (2) passes through the oil pipe port base (4), the ball (11) at the lower end of the ball screw (2) is installed in the fixed ball groove (6) and moves within the fixed ball groove (6), so as to freely adjust the angle of the lower guide head (7). The slip-on completes the contraction and expansion of a number of slip-on teeth (3) by sliding a number of slip-on teeth (3) on the inclined plane slider (1), so that the slip-on teeth (3) can disengage from or clamp the inner wall of the oil pipe during the pipe threading operation. After the pipe threading operation is completed, the ball screw (2) is rotated to release the expansion of the slip-on teeth (3), and the screw slip-on type pipe threading device is removed for the next operation.

2. The spiral slip type pipe threading device for continuous oil pipes according to claim 1, characterized in that A retaining piece (5) is provided between the oil pipe port base (4) and the slip-on teeth (3).

3. The spiral slip type pipe threading device for continuous oil pipes according to claim 1, characterized in that The elastic member mainly includes a spring coil (10) and a spring (9). The spring coil (10) is located between the heads of a number of slip-on teeth (3), and the spring (9) is located between the main bodies of a number of slip-on teeth (3). A number of slip-on teeth (3) achieve expansion and contraction through the expansion and contraction of the spring coil (10) and the spring (9).

4. The spiral slip type pipe threading device for continuous oil pipes according to claim 1, characterized in that Before the pipe threading operation, the thread provided at the upper end of the ball screw (2) is rotated. The ball screw (2) drives the inclined plane slider (1) to move downward. After the inclined plane of the inclined plane slider (1) moves downward, it presses a number of slip-on teeth (3), so that a number of slip-on teeth (3) expand upward after being pressed, to complete the expansion of a number of slip-on teeth (3). A number of slip-on teeth (3) that expand after receiving a tensile force tightly clamp the inner wall of the oil pipe, forming a state of getting tighter as it is pulled, to avoid slipping. After the pipe threading operation is completed, the thread provided on the ball screw (2) can be rotated in the reverse direction. The ball screw (2) drives the inclined plane slider (1) to move upward. After the inclined plane of the inclined plane slider (1) moves upward, the inclined plane is disengaged from contact with a number of slip-on teeth (3), so as to release the expansion of a number of slip-on teeth (3), and the screw slip-on type pipe threading device is removed for the next operation.

Images