陇东地区深井钻井循环温度预测及应用分析  

Prediction of drilling cycle temperature of deep wells in Longdong area

作　　者：王瑞[1,2] 陈子豪[1] 李录科 李伟峰 袁晨雨 张瑞超 周毅 WANG Rui;CHEN Zihao;LI Luke;LI Weifeng;YUAN Chenyu;ZHANG Ruichao;ZHOU Yi(College of Petroleum Engineering,Xi’an Shiyou University,Xi’an 710065,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Southwest Petroleum University),Chengdu 610500,China;CCDC Changqing General Drilling Company,Xi’an 710068,China;Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi’an 710065,China)

机构地区：[1]西安石油大学石油工程学院,西安710065 [2]油气藏地质及开发工程全国重点实验室(西南石油大学),成都610500 [3]中国石油集团川庆钻探工程有限公司长庆钻井总公司,西安710018 [4]陕西延长石油(集团)有限责任公司研究院,西安710065

出　　处：《非常规油气》2024年第4期135-143,共9页Unconventional Oil & Gas

基　　金：油气藏地质及开发工程全国重点实验室(西南石油大学)开放基金课题项目“深层页岩气藏气体吸附平衡诱导下的基质孔隙变形研究”(PLN202124);陕西高校青年创新团队“难动用油气地质工程一体化高效开发创新团队”;西安石油大学青年科研创新团队项目“复杂地层钻采工程力学行为表征及控制理论与技术”(2019QNKYCXTD04)。

摘　　要：长庆油田陇东地区部分天然气井深度约为5000 m,相应的地层温度会超过130℃。然而随着该地区对深层油气、非常规油气以及页岩气等资源的不断开发,高温已成为钻井作业的重要制约因素。为了防范井下高温可能引发的工程事故,构建了一个二维钻井循环温度预测模型,对井筒温度特性进行了分析,并为钻井液和钻井工具的选择提供了理论支持。研究结果表明:1)在开始泵送循环的初期,井口温度迅速升高,井底温度迅速下降,之后的1.5 h内,井口和井底温度变化逐渐趋缓;2)在相同的井深下,随着循环时间的增加,井筒内的钻柱内钻井液温度和环空内钻井液温度逐渐下降,同时相应位置的环空内钻井液温度和钻柱内钻井液温度也下降;3)在预测的温度范围内,对该井的3种钻井液体系进行了表观黏度和塑性黏度实验,结果显示黏度的变化受温度影响较大;4)在预测的温度范围内,以三元乙橡胶为研究对象,随着老化时间的增加以及温度的升高,橡胶密封圈的厚度逐渐减小,硬度逐渐增加,压缩永久变化率也逐渐增加。该预测模型的预测结果与实际生产相符,为设计和选型提供了有价值的指导,具有重要的研究意义。In the Longdong area of the Changqing Oilfield,the depths of certain natural gas wells are around 5000 meters,and the corresponding formation temperature exceeds 130℃.However,with the continuous development of deep oil and gas,unconventional oil and gas resources,and shale gas in this region,high temperature has become a significant constraint on drilling operations.To prevent potential engineering accidents caused by high temperatures underground,this paper establishes a two-dimensional drilling circulation temperature prediction model,conducts an analysis of wellbore temperature characteristics,and provides theoretical support for the selection of drilling fluids and drilling tools.The research findings indicate:1)Initially after the start of pump circulation,the wellhead temperature rises rapidly,while the bottomhole temperature drops rapidly,and within the subsequent 1.5 hours,the temperature changes at both ends gradually slow down.2)At the same well depth,as the circulation time increases,the temperatures of the drilling fluid inside the drill string and inside the annulus gradually decrease,and correspondingly,the temperatures of the drilling fluid in the annulus and inside the drill string at the respective positions also decrease.3)Within the predicted temperature range,experiments were conducted on the apparent viscosity and plastic viscosity of three drilling fluid systems for the well,and the results show that viscosity changes are significantly affected by temperature.4)Within the predicted temperature range,with the ternary ethylene-propylene rubber as the study object,the thickness of the rubber sealing ring gradually decreases,the hardness increases,and the compressive permanent deformation rate increases with the increase in aging time and temperature.The results of this predictive model align with actual production,providing valuable guidance for design and selection,thus holding important significance in the research field.

关 键 词：陇东地区 深井钻井 温度预测 钻井温度 

分 类 号：TE21[石油与天然气工程—油气井工程]