缅甸D区块Y-1井高压防气窜固井技术

High pressure and gas migration control cementing techniques for well Y-1 in block D Myanmar

宋健 金衍 陈勉 柳贡慧

SONG Jian JIN Yan CHEN Mian LIU Gonghui

中国石油大学，北京　102249 中国石化国际石油勘探开发公司，北京　100083

China University of Petroleum, Beijing 102249, China SINOPEC Internation Petroleum E&

Y-1井是缅甸D区块最深的一口探井，固井时存在高压油气层、地层漏失与垮塌严重、压力窗口窄等难题，可借鉴的邻井资料有限。为确保达到良好的固井质量，通过颗粒级配和优选添加剂等措施筛选出具有良好沉降稳定性的高密度防气窜水泥浆体系，并通过停机试验等方法全面评价了水泥浆性能，确保其能够适应井下各种工况条件。现场作业中，采取先导钻井液技术提高顶替效率，采取井口压力控制以防止漏失的发生，采用封隔式悬挂器、井口憋回压等措施增强防气窜效果。该井现场施工顺利，测井结果显示固井质量良好，达到测试等后期完井作业要求。Y-1井固井作业的成功，为该区块的油气勘探工作打下良好基础。

Well Y-1 is the deepest exploration well in block D Myanmar The cementing job is very difficult on the well, because of high pressure, fluid loss and serious collapse, narrow weight window, etc, and there is limited data for reference. To overcome these difficulties, through optimizing particles of cement and additives, the high density gas crossing proof slurry was developed. The slurry performance was tested by machine-stop method to ensure its fitness for all the cementing status. In the field tests, pilot slurry technique was taken to improve displacing efficiency. Wellhead pressure was controlled to prevent leakage. Liner hanger with packer and back pressure technique was applied to enhance the cement slurry performance on gas migration and avoiding loss in cementing job. The cementing job was finished successfully, without gas migration and loss in pumping and displacing job, and the cement quality met the requirement of well completion. The job sets an excellent example for the block in cementing job.