Hydraulic power three-stage unfolding type coal bed gas cave manufacturing tool

Abstract

The invention discloses a hydraulic power three-stage unfolding type coal bed gas cave manufacturing tool. The hydraulic power three-stage unfolding type coal bed gas cave manufacturing tool comprises an upper connector, a main shaft rotation system and a horizontal cave manufacturing system. The upper connector is connected with a drill pipe. The main shaft rotation system is provided with three jet flow holes and can be pushed to break rocks rotationally through the action force generated by hydraulic jetting. Meanwhile, the main shaft rotation system further comprises an auxiliary jet flow system arranged on the lower portion of the tool to assist the main shaft rotation system in breaking rocks rotationally. The horizontal cave manufacturing system comprises three stages of telescopic drill bits which can be unfolded stage by stage through hydraulic pressure. Each stage of drill bit is provided with three jet flow holes and is pushed to rotationally break rocks through the action force generated by hydraulic jetting. Rotation of the main shaft rotation system and the horizontal cave manufacturing system of the tool is pushed through hydraulic force, the rotation in the two directions cooperates with each other and forms a feedback mechanism, and therefore a cave is manufactured in a stage-by-stage unfolding mode laterally. The hydraulic power three-stage unfolding type coal bed gas cave manufacturing tool is easy and convenient to operate, easy to control, and capable of keeping stability of a well wall during cave manufacturing, preventing the well wall from collapsing and manufacturing the relatively regular cave. In addition, the hydraulic power three-stage unfolding type coal bed gas cave manufacturing tool can be applied to the expanding work of a necking down formation.

Description

Technical field [0001] The invention relates to a supporting device for cave-making operations of a coal-bed methane well, in particular to a hydraulic power three-stage deployment type coal-bed methane cave-making tool. Background technique [0002] CBM development is the focus of my country's energy development. Because the output of CBM vertical well development is too different from the expected effect, the "U-shaped well" connection technology is widely used in CBM development, that is, the two well bores of the horizontal well and the drainage well are interconnected. In the "U-shaped well" connection technology, the horizontal well bore is connected to the drainage well bore. In order to ensure the probability of connection, it is necessary to expand the diameter of the well to create caves at the connection point of the drainage well design. In addition, in the drilling operation, when encountering a necked formation, it is also necessary to run tools to expand the diam...

AI Technical Summary

Problems solved by technology

However, from the perspective of application effect, the negative pressure cavitation process equipment is complicated, the technical requirements are high, the operation is difficult, and the risk factor is large; the jet cavitation technology cannot accurately obtain the cave diameter, and the process parameters are uncontrollable; the mechanical tool cavitation is small in size and low in strength , and it is easy to get stuck in the ground, so the stability of the well wall cannot be guaranteed

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