盐穴储气库老井封堵界面胶结强度试验研究  

Experimental Study on the Consolidation Strength of Old Well Plugged Back Interface in Salt Cavern Gas Storage

作　　者：蔡楚楚 王江帅 付盼 邓嵩[1] 殷文 Cai Chuchu;Wang Jiangshuai;Fu Pan;Deng Song;Yin Wen(School of Petroleum and Natural Gas Engineering,Changzhou University;CNPC Engineering Technology R&D Company Limited;National Engineering Research Center of Oil&Gas Drilling and Completion Technology)

机构地区：[1]常州大学石油与天然气工程学院 [2]中国石油集团工程技术研究院有限公司 [3]油气钻完井技术国家工程研究中心

出　　处：《石油机械》2024年第7期93-97,共5页China Petroleum Machinery

基　　金：中国石油天然气集团有限公司课题“盐穴压缩空气与氢气储能工程关键技术研究”(2021DJ5402);常州大学科研启动基金项目“深水高温高压控压钻井井筒压力预测与控制”(ZMF22020060);江苏省高等学校基础科学(自然科学)研究面上项目“石墨烯和碳化硅颗粒改性PDC钻头胎体磨损与腐蚀机理研究”(22KJD430001)。

摘　　要：现阶段进行的水泥塞封堵界面胶结强度测试研究未考虑高温高压对其测试的影响,且大多数开展的是常温常压下水泥塞的剪切胶结强度测试。为此,设计了盐穴储气库老井封堵水泥塞综合胶结强度原位测试装置,并在80℃、15 MPa的模拟条件下,开展了不同界面、不同水泥塞长度和直径及水泥浆体系条件下的水泥塞胶结强度测试试验,明确了不同因素对胶结强度的影响规律。试验结果表明:水泥塞-岩石/套管界面的胶结强度受水泥浆体系影响较大,盐层水泥浆体系下的界面胶结强度大于盖层水泥浆体系下的界面胶结强度;水泥塞-岩石界面胶结强度略大于水泥塞-套管界面胶结强度;水泥塞-岩石/套管界面的拉伸胶结强度低于剪切胶结强度,且两者之比为0.41~0.45。研究成果可为盐穴储气库老井封堵界面密封失效的预测提供重要的理论支撑。The existing cement plug consolidation strength tests do not take into account the influences of high temperature and high pressure,and are mostly conducted on the shear consolidation strength of cement plugs at normal temperature and normal pressure.Therefore,an in-situ testing device for the comprehensive consolidation strength of old well plugged back cement plug in salt cavern gas storage was designed for cement plug consolidation strength tests under different interface,cement plug length/diameter and cement slurry system conditions,at the simulated temperature and pressure(80℃and 15 MPa),to clarify the influences of different factors on the consolidation strength.The experimental results show that the consolidation strength of the cement plug-rock/casing interface is greatly affected by the cement slurry system;the interfacial consolidation strength under the salt layer cement slurry system is greater than that under the caprock cement slurry system;the cement plug-rock interfacial consolidation strength is slightly greater than the cement plug-casing interfacial consolidation strength;the tensile consolidation strength of the cement plug-rock/casing interface is lower than the shear consolidation strength,and the ratio of them is 0.41–0.45.The research results provide important theoretical support for the prediction of sealing failure at old well plugged back interface in salt cavern gas storages.

关 键 词：盐穴储气库 界面胶结强度 水泥浆体系 水泥塞直径 水泥塞长度 

分 类 号：TE972[石油与天然气工程—石油机械设备]