水射流用于煤层切割的可行性分析

A Feasibility Analysis about Hydraulic Jet Technique Used in Coal-bed Methane Exploitation

在煤层钻井和固井过程中,近井区域可产生裂缝扭曲,为后期压裂造成困难.高压水射流技术一方面利用水击作用能有效解除钻井、固井造成的堵塞,使井周环形区域应力再次调整,大部分区域应力下降解除压实效应;另一方面在环空增加一定压力使产生的微裂缝得以延伸,实现水力喷射压裂,可以大幅提高井周的渗透率.对高压水射流技术用于煤层气开发问题进行了技术方面的探讨.

The crevice near the well is contorted during drilling and completion,it will be influence the fracturing working. Hydraulic Jet flow technique takes advantage of the hydraulic perforating and hydraulic fracturing technologies,it will eliminate the formation plugging,adjust annular ayer stress near the well,in the other hand,it will extend the micro- crevice through increasing pressure,and improve penetrability. This paper describes the technique about its current situation,principles and processes,introduces technical characteristics and then analyzes the hydraulic jet technique used in coal- bed methane exploitation,It will offer a new method of increasing production.