Coiled tubing falling-prevention device and usage method thereof

Abstract

The invention discloses a coiled tubing falling-prevention device and a usage method thereof. The coiled tubing falling-prevention device comprises a spear-shaped central rod, a grooving slip and a limiting prevention cylinder which are sequentially arranged from inside to outside in a sleeved mode. The inner wall of the limiting prevention cylinder sequentially and inward sinks from top to bottom step by step to form a first annular step and a second annular step which are in shapes of steps, the top end face of the grooving slip abuts against the lower end face of the first annular step, an outer thread is arranged on the outer wall of the spear-shaped central rod, a connecting outer thread is arranged on the inner wall of the first annular step of the limiting prevention cylinder, and the grooving slip is limited by adjusting the limiting prevention cylinder relative to the position at the thread connecting position on the spear-shaped central rod. A falling-prevention function during coiled tubing fishing can be played by using the coiled tubing falling-prevention device. When a dangerous overflow case appears at a well opening, blowout prevention short section matched with the device is rapidly installed in time, and the blowout prevention problem of a coiled tubing inner cavity and a small annulus between the coiled tubing and an oil pipe can be also solved.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploitation, in particular to a device for preventing falling of a coiled tubing and an application method thereof. Background technique [0002] In the production and development process of various oil and gas fields, the most common construction of coiled tubing is to carry out operations such as gas lift injection, sand washing and plug removal in 2 7 / 8″ or 3 1 / 2″ tubing, and sometimes coiled tubing After being broken off, it got stuck in the tubing, and the broken coiled tubing could not be fished out by conventional fishing methods. The coiled tubing could only be taken out by the tubing. After the coiled tubing is stuck in the tubing, the remaining dropped coiled tubing can be pulled out by drilling the special clip for the coiled tubing at the wellhead and penetrating the injection head. The stuck point of the coiled tubing becomes loose, causing the risk of the coiled tubing fa...

AI Technical Summary

Problems solved by technology

[0002] In the production and development process of various oil and gas fields, the most common construction of coiled tubing is to carry out operations such as gas lift injection, sand washing and plug removal in 2 7 / 8″ or 3 1 / 2″ tubing, and sometimes coiled tubing After being broken off, it got stuck in the tubing, and the broken coiled tubing could not be fished out by conventional fishing methods. The coiled tubing could only be taken out by the tubing. After the coiled tubing is stuck in the tubing, the remaining dropped coiled tubing can be pulled out by drilling the special clip for the coiled tubing at the wellhead and penetrating the injection head. The stuck point of the coiled tubing becomes loose, causing the risk of the coiled tubing falling into the well again. At the same time, the inner cavity of the coiled tubing at the wellhead and the space between the coiled tubing and the small annulus of the tubing are in an uncontrolled state, and the risk of well control is great. Once an overflow occurs, etc. Well control is dangerous, failure to take effective measures is likely to cause blowout or blowout out of control accidents, so it is necessary to develop a device to solve the above problems

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