A buckle joint tool applied to lifting expansion method

Abstract

The invention discloses a buckle joint tool and a lifting expansion method. The tool comprises an upper joint, a connecting pipe, a releasing sliding sleeve, a middle joint and a lower joint; the upper end of the connecting pipe is connected with the upper joint, and first slits are formed in the pipe wall, close to the lower end, of the connecting pipe; a protrusion portion is arranged at the tail ends of the first slits; the releasing sliding sleeve is fixed to the connecting pipe though a pin, and the lower end of the releasing sliding sleeve can apply an expansion force to the first slitsof the connecting pipe; a clamping groove for matching with the protrusion portion is formed in the inner side of the middle joint, second slits are formed in the lower end of the middle joint, and anouter snap screw thread of which the length is smaller than the length of the second slits is arranged at the position of the second slits; an inner snap screw thread matched with the outer snap screw thread is arranged at the inner side of the lower joint. The buckle joint tool and the lifting expansion method have wide application range and good expansion effects.

Description

technical field [0001] The invention relates to the technical field of downhole operations in oil and gas fields, in particular to a butt joint tool used in a lift-up expansion method. Background technique [0002] The descriptions in this section merely provide background information related to the disclosure in this application and may not constitute prior art. [0003] The existing expansion screen generally adopts the down-pressure expansion process, and the expansion mainly depends on the weight of the pipe string itself during implementation. Generally, the weight of the pipe string is directly proportional to the depth of the well. The deeper the well, the longer the length of the pipe string to be lowered, and the heavier the weight. Yet, when adopting above-mentioned down-pressure expansion technique to carry out operation, there is certain defect in its scope of application. For wells with relatively shallow well depth, if the weight of the pipe string run is not...

AI Technical Summary

Problems solved by technology

However, when the above-mentioned down-pressing expansion process is used for operation, there are certain defects in its scope of application.

For wells with relatively shallow well depth, when the weight of the pipe string run is not enough, the screen cannot be expanded smoothly. Therefore, the application range of the down-pressure expansion technology is limited

[0004] In a specific scenario, when the depth of the well is about 100 meters, the weight of the pipe string is far from reaching the expansion force required for expansion, and the expansion screen cannot be expanded at this time, that is to say, in this case Unable to expand using the press-down expansion process

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