柳州地区页岩气地质调查井钻探技术研究与应用

Research and application of drilling technology for shale gas geological survey wells in Liuzhou area

摘要:

页岩气地层裂隙发育，胶结性差，表现为岩石破碎、水敏性强、孔壁强度低。在钻进过程中容易出现坍塌、掉块、缩径等复杂情况，从而引发孔壁失稳、卡钻、埋钻等孔内事故。对广西柳州地区页岩气地质调查井工程进行钻探技术研究，应用PVA1788成膜体系无固相冲洗液和成膜防塌体系无固相冲洗液、绳索取心液动锤钻进技术、膨胀波纹管护壁新技术、螺杆钻具定向钻进纠斜技术，在现场勘探施工中取得了良好的效果，保证了项目的顺利施工。

Abstract:

Shale gas formation have developed fractures and poor cementation， manifested as rock fragmentation， poor water sensitivity， and low wellbore strength. During the drilling process， it is easy to encounter complex situations such as collapse， falling blocks， and diameter reduction， which can lead to instability of the wellbore， drilling jamming， and buried drilling accidents inside the hole. Research on deep exploration drilling technology for the geological survey well engineering of the shale gas geological survey project in Liuzhou， Guangxi， and the application of PVA1788 film-forming system without solid flushing fluid and film-forming anti collapse system without solid flushing fluid， rope coring fluid dynamic hammer drilling technology， new technology for expanding corrugated pipe wellbore protection， and directional drilling correction technology for screw drilling tools. Good construction effects have been achieved in a number of field applications.