超深井中带伸缩节测试管柱校核方法  

A checking method for test string with expansion joints in ultra-deep wells

作　　者：陈科[1] CHEN Ke(Downhole Operation Company,Sinopec Southwest Oil Engineering Co.,Ltd.,Deyang,Sichuan 618030,China)

机构地区：[1]中国石化西南石油工程有限公司井下作业分公司,四川德阳618030

出　　处：《天然气勘探与开发》2024年第6期87-94,共8页Natural Gas Exploration and Development

基　　金：中国石油化工股份有限公司科技攻关项目(编号:P22048)。

摘　　要：四川盆地东北部地区中二叠统茅口组是中国石化超深层气藏勘探开发的重要层位,具有埋藏深、高温、超高压、硫化氢含量高的“四高”特点,原有的深层测试管柱性能、结构等难以满足茅口组超深、超高压储层测试需求,管柱面临性能差及安全系数低的难题,测试管柱设计难,测试风险大。针对上述难题,根据川东北地区茅口组勘探评价的实际需要,通过伸缩节受力分析、管柱力学行为分析和管柱强度校核,对伸缩节数量和位置进行优化,形成了一套适用于超深井、超高压测试管柱的校核方法。现场应用表明:(1)考虑活塞效应、屈曲效应、鼓胀效应和温度效应及伸缩节对井下测试管柱受力和变形的影响,建立了高温、高压、超深井、带伸缩节测试管柱的力学模型;(2)通过优化设计的测试管柱在高温、高压井中,成功完成了酸压施工和压力温度资料的获取,验证了管柱强度校核方法的可靠性。研究成果为保障川东北地区茅口组超深气藏的安全高效勘探开发提供了有力支撑,对于推动深层油气资源的勘探开发具有重要意义。As the key target on ultra-deep gas reservoirs deployed by Sinopec in northeastern Sichuan Basin,the Middle Permian Maokou Formation is characterized by deep burial depth,high temperature,ultra-high pressure,and rich hydrogen sulfide.The previous test string was not good enough for Maokou reservoirs in terms of performance and structure due to poor properties and low safety factor.And the string is hard to design and risky in such reservoirs.Thus,considered the needs of exploration and evaluation on the Maokou Formation in this area,a checking method suitable for the test string in ultra-deep and ultra-high pressure wells was established to optimize both quantity and position of expansion joints by analyzing joint’s force and string’s mechanical behaviors,and checking string’s intensity.Its application indicates that(i)a mechanical model is constructed for the string with joints in ultra-deep wells with high temperature and pressure by considering the controls of piston,buckling,and swelling and temperature effects together with expansion joints on the force and deformation of downhole string;and(ii)the optimized string makes acid fracturing and data acquisition in such wells a success,proving the reliability of this method.All research results not only offer strong support for ensuring this formation in the safe and efficient exploration and development,but are of great significance for advancing the exploration and development of deep-seated oil and gas resources.

关 键 词：四川盆地 超深井 超高压 伸缩节 测试管柱 管柱强度 应力分析 

分 类 号：TE34[石油与天然气工程—油气田开发工程]