Drilling device and method for efficient rock breaking by using liquid nitrogen jet flow

Abstract

The invention discloses a drilling device and method for efficient rock breaking by using liquid nitrogen jet flow. The method comprises the following steps that liquid nitrogen is used as a jet flow medium and is sprayed out from a high-pressure jet flow spray nozzle in a pulse form; pulse waves further press a disc spring arranged in an opening position of the high-pressure jet flow spray nozzle, so that the disc spring generates vibration to drive the whole spray nozzle to vibrate; the generation of ice bags is avoided. The system is provided with a continuous oil pipe, a liquid nitrogen injection pipeline, an annular sleeve pipe, a liquid nitrogen compressor, a liquid nitrogen pump group, a continuous oil pipe operation car and a drilling device. The drilling device and the drilling method have the advantages that the acting principle of the liquid nitrogen at the stratum is utilized; a jet flow technology using the liquid nitrogen as the jet flow medium is combined with a continuous pipe technology; the stratum efficient rock breaking can be realized; the rock can be broken effectively, so that the drilling efficiency is higher; the cost is lower.

Description

technical field [0001] The invention belongs to the field of oil and gas exploitation, and in particular relates to a drilling device and method for efficiently breaking rocks by liquid nitrogen jets. Background technique [0002] As most of my country's oil fields have entered the middle and late stages of development, my country's oil and gas exploration and development have shifted from the previous good exploration and development conditions such as large integrated oil and gas fields and medium-high permeability homogeneous sandstone to complex small and medium oil and gas fields, fault-block oil and gas fields, low pressure and low Due to harsh exploration and development conditions such as low seepage productivity, reconstruction of old oilfields, complex reservoir conditions, hard-to-produce reserves, and unconventional oil and gas, more complex situations are encountered during drilling, and the rate of decline in drilling speed increases significantly with the increa...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a drilling device and method that uses liquid nitrogen jets to efficiently break rocks, aiming to solve the problems of low drilling speed and "ice packs" produced by liquid nitrogen in the current drilling process

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