提高高压气井套管回接固井质量的技术  

Technology of improving the quality of casing tie-back cementing in high-pressure gas wells

作　　者：马勇[1,2] 姚坤全[1] 常洪渠[1] 李早元[2] 郭小阳[2] 石庆 杨刚 李巍 

机构地区：[1]中国石油西南油气田公司 [2]“油气藏地质及开发工程”国家重点实验室·西南石油大学 [3]川庆钻探工程公司井下作业公司 [4]川庆钻探工程公司钻采工艺技术研究院

出　　处：《天然气工业》2009年第2期61-63,共3页Natural Gas Industry

基　　金：中国石油西南油气田公司科研项目“川渝油气田特殊井固井技术及隔离液带料技术服务”[(编号:XNSIIJS(2007)62];四川省应用基础研究项目(编号:2007JY029-136)的部分研究成果

摘　　要：为了解决套管回接固井常出现的质量不佳和井口带压的问题,在实验的基础上,提出套管回接固井作业时应先泵入低黏、抗钙钻井液和大量冲洗液彻底冲刷套管壁,水泥浆中应加入膨胀剂和纤维,改善水泥石力学性能,确保水泥环与套管胶结质量。采用高能混浆设备配浆和井口憋压候凝,确保水泥浆密度均匀,防止水泥浆体积收缩、管柱膨胀和水泥环微环隙的形成。几口试验井的声波测井结果表明:所采取的技术措施行之有效,能够保证套管回接固井质量。In order to solve the problems of poor cementing quality and sustained casing pressure of casing tie-back cementing,it is recommended to pump downhole low-viscosity calcium-service drilling fluid and large amounts of washing fluid to flush the casing wall thoroughly before hand.And expansion agent and fibers should be added in the cement slurry to improve the mechanics of the cement stones so as to ensure the bond quality between the cement sheath and casing.Large power mixing machine should be used for slurry preparation and wellhead backpressure be applied during WOC period to ensure the uniformity of slurry density and prevent volumetric shrinkage of slurry,expansion of casing string and micro-annulus formed in cement sheath.The acoustic logging results of test wells indicate that the technical measures adopted are effective,enough to ensure the quality of casing tie-back cementing.

关 键 词：高压气井 套管回接器水泥胶结 密度 聚磺钻井液 冲洗液 

分 类 号：TE256[石油与天然气工程—油气井工程]