乌鲁木齐矿区大倾角地层煤层气钻井井壁稳定性研究  

Study on Wall Stability of CBM Borehole in Large Dip Strata in the Urumqi Mining Area

作　　者：刘蒙蒙 LIU Mengmeng(NO.156 Exploration Team of Xinjiang Bureau of Coalfield Geology,Xinjiang 830009)

机构地区：[1]新疆维吾尔自治区煤田地质局一五六煤田地质勘探队,新疆830009

出　　处：《中国煤层气》2020年第4期24-28,共5页China Coalbed Methane

基　　金：“十三五”国家科技重大专项项目“新疆准噶尔、三塘湖盆地中低煤阶煤层气资源与开发技术”(2016ZX05043);自治区重大科技专项“新疆准噶尔盆地南缘煤层气资源评价与勘查开发关键技术”。

摘　　要：准南煤田乌鲁木齐矿区是新疆煤层气勘探开发的有利区,地层倾角大,地质构造复杂,井壁稳定性是钻井工程首先需要解决的一个难题。井壁的张性破裂(井漏)和剪切垮塌是钻井过程中经常遇到的井壁稳定性问题,严重影钻井的速度、质量与成本,同时井壁稳定性也是决定套管层次的重要因素之一。可根据不同情况,优选钻井液体系与安全密度窗口,保障井壁稳定性。The Urumqi Mining Area in Zhunnan Coalfield is a favorable area for CBM exploration and development in Xinjiang. The Area is featured with large stratigraphic dip and complex geological structure, and the wall stability of the boreholes is a difficult problem needed to be solved first for drilling engineering. The tensile fracture(circulation) and shear collapse of the wall are the problems of wall stability which often encounter in the process of borehole drilling and have severely influence on the drilling speed, quality and cost. The wall stability is also one of the important factors to determine the casing levels. According to different situations, the selection of drilling fluid system and safety density window can be optimized to guarantee the wall stability y of boreholes.

关 键 词：乌鲁木齐矿区 大倾角地层 煤层气 井壁稳定性 煤岩理化性能 钻井工程 

分 类 号：TE28[石油与天然气工程—油气井工程]