气体钻井后气液转换新工艺

New Technology of Drilling Fluids Conversion after Gas Drilling

马庆涛

Ma Qingtao

中石化胜利石油工程有限公司钻井工艺研究院, 山东东营 257017

Drilling Technology Research Institute, Sinopec Shengli Oilfield Service Corporation, Dongying, Shandong, 257017, China

为了解决气体钻井后气液转换过程中容易出现的地层水化剥蚀、井壁坍塌、钻井液漏失等问题,对气体钻井后的气液转换工艺进行了研究。分析了3种常规气液转换工艺存在的风险,根据井壁润湿反转理论,在井壁上喷淋润湿反转剂使其形成亲油状态,保护井壁不坍塌;在注入钻井液前先将钻头提至上一层套管内,然后旋转钻头喷淋润湿反转剂,对井壁进行润湿反转处理;最后将钻头下到井底,边慢速起钻边小排量注入钻井液。在元坝区块元页 HF-1 井的应用表明,转换时间仅为常规气液转换工艺的47%,润湿反转剂消耗量仅为常规气液转换工艺的13%,整个过程无井下故障发生。这说明该气液转换新工艺是一种安全、简易、经济有效的气液转换工艺,可为气体钻井后气液转换提供新的技术支持。

In order to solve the problems such as formation hydration,erosion,borehole collapse,loss of circulation,which are likely to occur during drilling fluid conversion after gas drilling,the gas-drilling fluid alteration process after gas drilling was studied.Three kinds of risks associated with conventional gas-drilling fluid conversion were analyzed.According to wettability reversal theory,spraying wet reversal agent to borehole to make it oil-wet for keeping borehole stability.The procedure includes pulling the bit back up to the last casing,then rotating bit,spraying wet reversal agent to change the borehole wettability.Finally,the drilling bit can be run to the bottom,and pumping drilling fluids at low flow rate while tripping out at slow speed.The application of the procedure in Well Yuanye HF-1 in Yuanba Block showed,the operation time was only 47% that of conversional method,and the consumption of wet reversal agent was only 13% of that in conversional ways,was no trouble occurred.It indicated that new alteration process for gas-drilling fluid was safe,simple,economic,and effective,could provide technical support for drilling fluid alteration after gas drilling in the future.

国家科技重大专项"大型油气田及煤层气开发"(编号:2011ZX05022-001)资助

https://doi.org/10.3969/j.issn.1001-0890.2013.05.013