Jar knocker for coiled tubing jam release

Abstract

The invention discloses a jar knocker for coiled tubing jam release, and belongs to the technical field of coiled tubing drilling. The jar knocker comprises a jar knocker base, a lifting cylinder, a slip mounting base, a slip adjusting cylinder mounting seat, a slip adjusting cylinder, a slip and a strong spring. After the slip tightly holds a coiled tubing, the lifting cylinder pushes a first piston rod to move upwards, the coiled tubing is lifted upwards and cannot generate vertical displacement as the coiled tubing is clamped at a clamping point, the coiled tubing can elastically deform to save large elastic potential energy, high-pressure hydraulic cylinder in the lifting cylinder is pumped out, the coiled tubing can generate high impact load under the action of the elastic potential energy and gravitational potential energy, the clamping point of the coiled tubing is subjected to jarring action, the jam release difficulty of the coiled tubing is reduced, snap of the coiled tubing due to the fact that upward drawing force is larger than the fracture drawing force of the coiled tubing in the coiled tubing jam release process is avoided, and safe and efficient jam release of the coiled tubing is realized.

Description

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

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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