Jam releasing device of coiled tubing

Abstract

The invention discloses a jam releasing device of a coiled tubing, and belongs to the technical field of coiled tubing drilling. The device includes a main supporting body, an upper flange, a lifting oil cylinder, an upper slip mounting base, a mounting base of an upper slip adjusting oil cylinder, the upper slip adjusting oil cylinder, an upper slip, a lower slip mounting base, a lower slip adjusting oil cylinder and a lower slip; when the upper slip is positioned on the lower end of the upper slip mounting base, the upper slip clings to the coiled tubing; when the lower slip is positioned on the upper end of the lower slip mounting base, the lower slip releases the coiled tubing; the upper slip cooperates with the lower slip, driven by the lifting oil cylinder, the coiled tubing can be repeatedly lifted and put down, and safe jam releasing of the coiled tubing can be achieved; when upward tension force on the coiled tubing is bigger than the breaking tensile force of the coiled tubing during a jam releasing process of the coiled tubing, the coiled tubing can be broken, however, by using the jam releasing device of the coiled tubing, the situation above can be avoided, jam releasing difficulty of the coiled tubing is reduced, and safe and highly effective jam releasing of the coiled tubing can be achieved.

Description

technical field [0001] The invention relates to the technical field of coiled tubing drilling, in particular to a coiled tubing unblocking device. Background technique [0002] In recent years, with the exploitation of oil and natural gas resources more and more fully. There are fewer and fewer oil resources that are conducive to extraction, and people are turning their attention to shale oil and gas and some oil resources that need to be turned to drilling. Due to the single drilling direction and low work efficiency of the previous rotary drilling method, it was gradually replaced by the coiled tubing drilling technology with wide applicability and high work efficiency. [0003] When the uplift force required to lift a coiled tubing exceeds 80% of its yield strength, the condition is defined as a stuck coiled tubing. The reasons for the stuck coiled tubing mainly include the following: (1) During the drilling process, the drilling fluid is continuously circulated to cool...

AI Technical Summary

Problems solved by technology

The reasons for the stuck coiled tubing mainly include the following: (1) During the drilling process, the drilling fluid is continuously circulated to cool the drilling process, but the solid particles contained in it are easy to accumulate in the holes where the coiled tubing passes. As a result, the coiled tubing string is stuck; (2) when the coiled tubing is drilled, the diameter of the wellbore is small, and when the formation is deformed, it is easy to squeeze the tubing wall and deform, resulting in a stuck situation; (3) in the wellbore When the drilling fluid falls into the drilling tool, it needs to be salvaged. If the salvage operation is improperly operated, it is easy to cause the coiled tubing string to be stuck; (4) There is a problem with the operation method during the cementing operation The resulting coiled tubing is stuck; (5) The coiled tubing is stuck due to the generation of a large amount of debris during the perforating operation

[0004] In the prior art, the injection head is usually used to unblock the coiled tubing. However, since the maximum lifting force of the injection head is generally much greater than the maximum pulling force that the coiled tubing can withstand before it breaks, once the coiled tubing is seriously stuck, injection The pulling force generated by the coil head is easy to exceed the breaking force of the tubing, which will directly break the coiled tubing

Moreover, once the coiled tubing string is broken, it will be more difficult to release the jam, and the oil well will also be unusable.

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