CN-117514077-B - Coiled tubing wellhead fracture capturing device

Abstract

The invention discloses a continuous oil pipe wellhead fracture capturing device which comprises a cylindrical outer barrel, wherein a cylindrical inner barrel is arranged below the inner part of the outer barrel, a base is arranged below the inner part of the inner barrel, four uniformly distributed slips are arranged on the base, four groups of connecting rod assemblies are arranged inside the inner barrel, and each connecting rod assembly comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod. When the coiled tubing breaks, the connecting rod assembly acts, the first connecting rod moves downwards and pushes the slips to move downwards, and the slips hold the coiled tubing tightly and lock. In this way, the roller and slip are far apart, and the control can be prevented from being affected by the delay from the trigger part to the execution part. The self weight of the connecting rod assembly and the slips is fully utilized through the connecting rod transmission, the slips respond rapidly in action, the system does not need to be connected with electricity, and safety explosion prevention is facilitated for wellhead construction.

Inventors

• LI JIAMING
• ZHUANG JINYU
• LI KAI
• XU KUN
• SUN CHENG
• WANG XIAOQIANG

Assignees

• 中国石油化工股份有限公司
• 中国石油化工股份有限公司华东油气分公司

Dates

Publication Date

20260512

Application Date

20231122

Claims (5)

1. 1. A continuous oil pipe wellhead fracture capturing device is characterized in that the continuous oil pipe wellhead fracture capturing device comprises a cylindrical outer barrel (12), a cylindrical inner barrel (11) is arranged below the inner part of the outer barrel (12), an annular guide ring (5) is arranged above the inner part of the outer barrel (12), a continuous oil pipe (6) is arranged in the center of the outer barrel (12), the continuous oil pipe (6) penetrates through the guide ring (5), The inside below of inner tube (11) be equipped with a base (14), base (14) on be equipped with four evenly distributed slips (13), base (14) on all be equipped with a "T" font base spout (141), slips (13) on all be equipped with a "T" font slips salient (131), slips salient (131) with base spout (141) cooperate, slips (13) towards one side of coiled tubing (6) be equipped with slips tooth (132), Four limiters (17) are arranged on the upper part of the inner wall of the inner cylinder (11), four vertical grooves (9) are arranged in the middle of the inner wall of the inner cylinder (11), two supporting lugs (8) are arranged on the two side walls of the vertical grooves (9), The inside of the inner cylinder (11) is provided with four groups of connecting rod assemblies (S), each connecting rod assembly (S) comprises a first connecting rod (1), a second connecting rod (2), a third connecting rod (3) and a fourth connecting rod (4), the lower end of the first connecting rod (1) is hinged with the slips (13), the upper end of the first connecting rod (1) is hinged with the outer end of the second connecting rod (2), the middle part of the second connecting rod (2) is hinged with the supporting lug (8), the inner end of the second connecting rod (2) is hinged with the lower end of the third connecting rod (3), the upper end of the third connecting rod (3) is hinged with a roller (7), the lower end of the fourth connecting rod (4) is hinged with the roller (7), the upper end of the fourth connecting rod (4) is hinged with the limit stopper (17), The vertical grooves (9) are internally provided with springs (10), the lower ends of the springs (10) are fixedly connected with the bottoms of the vertical grooves (9), and the upper ends of the springs (10) are fixedly connected with the upper ends of the first connecting rods (1).
2. 2. Coiled tubing wellhead breakage capture device according to claim 1, characterized in that the guide ring (5) is provided with a conical mouth (51) at the upper inside.
3. 3. The coiled tubing wellhead fracture capture device according to claim 1, wherein a chute (133) is provided at an upper portion of the slip (13), a slidable slider (15) and a coil spring (16) are provided in the chute (133), and the coil spring (16) is engaged with the slider (15).
4. 4. A coiled tubing wellhead fracture capture device according to claim 3, wherein the slider (15) is cylindrical.
5. 5. The coiled tubing wellhead fracture capture device according to claim 1, wherein the limiter (17) comprises two opposite limiting sheets (171) which are shaped like a 7, a pin (172) is mounted at the lower end of the limiting sheet (171), and the pin (172) limits the opening angle of the fourth connecting rod (4).

Description

Coiled tubing wellhead fracture capturing device Technical Field The invention relates to oil well equipment, in particular to a fracture capturing device for a continuous oil pipe wellhead. Background At present, when coiled tubing equipment is in oil field operation, as the clamping blocks of the injection head fall or the coiled tubing is lowered in the process, the coiled tubing is broken at the gap between the injection head chain and the blowout prevention box due to untimely treatment, so that the coiled tubing falls into a well, and no effective measures and equipment are provided for prevention at present. Chinese patent CN111946290a discloses a coiled tubing anti-drop device, which adopts devices such as steel wire rope, spring, pull rod, etc. to drive slips to move axially, and clamps the pipeline after the coiled tubing breaks, so as to prevent drop. However, in the scheme, the end part of the slip is matched with the conical surface of the outer cylinder, the radial clamping effect of the slip is very limited, when the spring is matched with the steel wire and the slip triggers the clamping movement, the cross shaft sleeve is required to be dragged to move upwards through the steel wire, the transmission process is complex, and the starting delay of the slip is excessively long, so that the triggering end is required to be far away from the slip, the length of the well drop preventing device is excessively long, and the equipment installation and use difficulty is increased. Disclosure of Invention In view of the foregoing, it is desirable to provide a coiled tubing wellhead fracture capture device that addresses the above-described issues. In order to solve the technical problems, the invention adopts the following technical scheme: A fracture catching device for a continuous oil pipe wellhead is characterized in that the fracture catching device for the continuous oil pipe wellhead comprises a cylindrical outer cylinder, a cylindrical inner cylinder is arranged below the inner part of the outer cylinder, an annular guide ring is arranged above the inner part of the outer cylinder, a continuous oil pipe is arranged in the center of the outer cylinder, the continuous oil pipe penetrates through the guide ring, A base is arranged below the inner part of the inner cylinder, four uniformly distributed slips are arranged on the base, a T-shaped base sliding groove is arranged on the base, a T-shaped slip protrusion is arranged on each slip, the slip protrusion is matched with the base sliding groove, slip teeth are arranged on one side of each slip facing the continuous oil pipe, Four limiters are arranged on the upper part of the inner wall of the inner cylinder, four vertical grooves are arranged in the middle of the inner wall of the inner cylinder, two supporting lugs are arranged on the two side walls of the vertical grooves, The inner cylinder is internally provided with four groups of connecting rod assemblies, each connecting rod assembly comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, the lower end of the first connecting rod is hinged with the slip, the upper end of the first connecting rod is hinged with the outer end of the second connecting rod, the middle part of the second connecting rod is hinged with the support lugs, the inner end of the second connecting rod is hinged with the lower end of the third connecting rod, the upper end of the third connecting rod is hinged with a roller, the lower end of the fourth connecting rod is hinged with the roller, the upper end of the fourth connecting rod is hinged with the limiter, The vertical groove is internally provided with a spring, the lower end of the spring is fixedly connected with the bottom of the vertical groove, and the upper end of the spring is fixedly connected with the upper end of the first connecting rod. As a preferred embodiment of the invention, a cone opening is arranged above the inner side of the guide ring. As a preferred embodiment of the invention, the upper part of the slip is provided with a chute, a slidable slide block and a coil spring are arranged in the chute, and the coil spring is matched with the slide block. As a preferred embodiment of the invention, the sliding block is cylindrical. As a preferred embodiment of the invention, the limiter comprises two opposite limiting thin plates which are 7-shaped, wherein a pin shaft is arranged at the lower end of each limiting thin plate, and the pin shaft limits the opening angle of the fourth connecting rod. Compared with the prior art, the invention has the following beneficial effects: The invention provides a coiled tubing wellhead fracture capturing device, which is characterized in that after a coiled tubing is broken, the coiled tubing falls through a roller, and under the action of spring tension and the self weight of a slip and a connecting rod assembly, a first connecting rod, a second con