三维井筒套管柱居中度设计——以川渝油气田为例  

A method for 3D casing-centralizing design in Chuanyu oil and gas field

作　　者：郑渊云 鲜明 邹祥富 杨若愚 龙远盛 黄凯然 ZHENG Yuanyun;XIAN Ming;ZOU Xiangfu;YANG Ruoyu;LONG Yuansheng;HUANG Kairan(Downhole Operation Company of Chuanqing Drilling Engineering Co.,Ltd.,PetroChina,Chengdu,Sichuan 610052,China;National Energy Research and Development Center for High Sulfur Gas Reservoir,Chengdu 610052,Sichuan,China;Exploration Utility Department of Southwest Oil&Gas Field Company,PetroChina,Chengdu 610041,Sichuan,China)

机构地区：[1]中国石油川庆钻探工程有限公司井下作业公司,四川成都610052 [2]国家能源高含硫气藏开采研发中心,四川成都610052 [3]中国石油西南油气田分公司勘探事业部,四川成都610041

出　　处：《石油地质与工程》2024年第3期102-107,112,共7页Petroleum Geology and Engineering

基　　金：中国石油集团油田技术服务有限公司科技项目“深井超深井安全优快钻完井技术研究与应用”(2023T-001-001);中国石油集团川庆钻探工程有限公司科技攻关项目“固井注水泥三维顶替模拟软件开发”(CQXN-2022-06)。

摘　　要：套管居中度对固井质量存在较大影响,合理设计套管居中度将极大改善套管环空流场分布,提高环空顶替效率,确保水泥环质量,为后续钻进和储层改造奠定基础。通过对现有主流套管柱居中度计算模型的局限性分析,提出因三维井筒中套管柱所受重力和轴向载荷不位于单一平面内,将发生非平面挠曲变形,侧向受力和径向偏移受到井筒轨迹和浮力变化影响的观点。基于真实井眼轨迹的三维形态,考虑井筒管柱轴向拉力对主、副法向平面挠度以及浮力效应的影响,建立了三维套管单跨梁居中度数学模型,编制了套管柱居中度模拟分析计算模块。通过与实钻井居中度成像测井数据对比表明:①该计算模式模拟结果与IBC套后成像测井实测居中度数据的平均整体误差仅7.6%;②通过增大直井段扶正器外径、尾管段替入清水实现漂浮效应减弱套管柱径向偏移量、合理加密安置上部直井段刚性扶正器间距等优化措施,能够显著提升管柱整体居中度至70%以上并改善水泥环质量。该设计模式能够有效指导川渝油气田高压气区套管居中度设计,对于提高复杂井筒环空封固质量有重要意义。The centralizing degree of the casing has a big impact on the cementing quality.A reasonable casing-centralizing design will greatly improve the distribution of casing annular flow field,enhance the efficiency of annular displacement,ensure the quality of cement sheath,and lay a foundation for subsequent drilling and reservoir transformation.By analyzing the limitations of existing mainstream models for calculating the centralizing degree of casing strings,it is proposed that due to the fact that the gravity and axial load acting on the casing string in a 3D wellbore are not located in a single plane,non planar bending deformation will occur,and lateral force and radial displacement will be affected by changes in wellbore trajectory and buoyancy.Based on the 3D shape of the real wellbore trajectory,considering the influence of axial tension on the deflection and buoyancy effects of the main and auxiliary normal planes,a 3D mathematical model of the single span beam casing-centralizing was established,and a simulation analysis and calculation module was developed.By comparing with the centralizing degree of the imaging logging data,the results indicate①The calculation error of the single-span beam model is less than 7.6%;②Optimizations such as increasing the outer diameter of stabilizer in vertical well section and displacing with water to achieve floating effect on top of liner which reduced the radial offset of the casing string,reasonably shortening the spacing between the rigid stabilizers in the upper vertical well section can improve the overall centralizing degree up to 70%and the quality of cement sheath.This model can provide a good guidance for casing-centralizing design and annulus sealing quality of complex wellbores in Chuanyu oil and gas field.

关 键 词：居中度 三维井筒 法向平面 扶正器 径向偏移 成像测井 

分 类 号：TE256[石油与天然气工程—油气井工程]