Self-rotating high-pressure water jet adjustable drilling device

Abstract

A self-rotating high-pressure water jet adjustable drilling device comprises a high-pressure pipe, a fixed shell, a rotating body and a rotating spraying head. The fixed shell comprises a cylindricalbody, the high-pressure pipe is arranged at the rear end of the cylindrical body, and a first propeller is mounted on the high-pressure pipe. The high-pressure pipe is fixed trough a second propellermounted at the rear end of the fixed shell, the rotating body is rotatably located in the fixed shell, and the rear portion of the rotating body is elastically supported to the fixed shell through a spring. The front portion of the rotating body is connected with the rotating spraying head provided with a breaking cutting nozzle set for front-end breaking operation. A first propulsion nozzle set is mounted on the first propeller, a second propulsion nozzle set is mounted on the second propeller, high-pressure fluid is broken through propulsion nozzle sets at the rotating spraying head, and thepropulsion nozzle sets drive the fixed shell and the rotating spraying head to move forwards, so that automatic propulsion drilling is achieved.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a self-rotating high-pressure water jet adjustable drilling device suitable for development fields such as coal bed methane, oil, and natural gas. Background technique [0002] In the prior art, there is a rotary high-pressure water jet drilling device, the rotational power of which comes from the water jet itself. One or more groups of nozzles are biased on the rotating sleeve of the drilling device, and the jet recoil force is used due to the eccentric reaction. The impulse moment realizes the automatic rotation of the drill bit after overcoming the friction moment between the rotating sleeve and the shaft; the self-propulsion is realized by using the jet recoil force of the reverse nozzle installed at the rear. [0003] Its disadvantages are: (1) cuttings of different sizes may be formed during the injection process, and the existence of large particle cuttings increases the ...

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Problems solved by technology

[0003] Its disadvantages are: (1) cuttings of different sizes may be formed during the injection process, and the existence of large particle cuttings increases the probability of cuttings blockage and the friction resistance during drilling, which affects the drilling length; ( 2) Due to the inhomogeneity of lithology, the uniformity of the drilling is affected, resulting in the inclination of the drilling, and it is easy to drill out of the target rock formation. In addition, the drilling becomes larger and the flow rate becomes smaller. If the flow rate is less than the critical flow rate, the sand carrying effect will be affected

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