摘要
控压固井技术在提高超深井固井质量方面取得了显著成效,然而,流体性能描述复杂、压力预测与控制难度大等难题成为制约其进一步发展的关键瓶颈。基于实验数据,采用分段方法描述流体性能参数与温压之间的关系,增加了超高温超高压环境下井筒流体性能的描述精度。针对不同工艺环节,提出了分段下套管-降密度工艺,建立了压力精确预测模型,采用膨胀性水泥主动补偿失重压力,解决了压力预测和控制的难题。通过分析回压泵能力与最大降密度值的关系,设计了旋转控制头胶芯和管线的升级方案,增强了设备的加压能力和工艺适应性。以施工参数全局最优解为目标,提出了“知识图谱+机理模型+参数优化”的智能设计方法,确保了施工过程的安全性和高效性。通过基础理论、压力模拟、硬件设备、施工参数4个方面的提升,以期推动该技术在超深井中的广泛应用,助力我国油气勘探开发的高质量发展。
Significant achievements have been made in improving the quality of cementing operations in ultra-deep wells by applying Managed Pressure Cementing(MPC)technology.However,challenges such as the description of complex fluid properties,and diff iculties in pressure prediction and control have become key bottlenecks restricting the further development of the technology.Based on experimental data,a segmented approach has been employed to describe the relationship between fluid properties and temperature/pressure,which has enhanced the accuracy of wellbore fluid characterization given the ultra-high temperature and ultra-high pressure conditions.For different process links,a segmented casing running–density reduction technology has been researched,and a precise pressure prediction model has been established.In addition,expansive cement has been used to actively compensate for the weight-loss pressure,solving the challenges in pressure prediction and control.After analyzing the relationship between backpressure pump capacity and the maximum density reduction value,an upgraded design for the stripper rubber of rotating control head and pipelines has been developed,signif icantly improving the pressurization capability and technological adaptability of the equipment.Targeting at the goal of globally optimal construction parameters,an intelligent design method combining“knowledge graph+mechanism model+parameter optimization”has been introduced,ensuring both safety and efficiency during operation process.Through advancements in fundamental theory,pressure simulation,hardware equipment,and construction parameter design,this study aims to promote the extensive application of MPC technology in ultra-deep wells,so as to support the high-quality development of petroleum exploration and exploitation in China.
作者
刘金璐
李军
张权
李宁
李晓春
张志
杨宏伟
王文旭
艾正青
LIU Jinlu;LI Jun;ZHANG Quan;LI Ning;LI Xiaochun;ZHANG Zhi;YANG Hongwei;WANG Wenxu;AI Zhengqing(PetroChina Tarim Oilf ield Company,Korla 841000,China;College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;R&D Center of Ultra-deep Complex Oil and Gas Reservoir Exploration and Development,CNPC,Korla 841000,China;Xinjiang Engineering Research Center of Ultra-deep Complex Oil and Gas Reservoir Exploration and Development,Korla 841000,China;Xinjiang Key Laboratory of Ultra-deep Oil and Gas,Korla 841000,China)
出处
《深地能源科技》
2025年第3期111-123,共13页
Deep Earth Energy Science & Technology
基金
国家自然科学基金重大科研仪器研制项目“钻井复杂工况井下实时智能识别系统研制”(52227804)
国家自然科学基金联合基金项目“特深井复杂温压场测量与井筒压力剖面控制基础研究”(U22B2072)
中国石油天然气集团有限公司科技项目“海相碳酸盐岩油气规模增储上产与勘探开发技术研究”(2023ZZ16)。
关键词
超深井
控压固井
井筒流体性能
压力预测
参数优化
ultra-deep well
managed pressure cementing(MPC)
wellbore fluid property
pressure prediction
parameter optimization
