耐二氧化碳井下节流器投捞工艺延长凝析气井经济开采期  

Extending the economic exploitation of condensate gas wells by deploying and retrieving of CO_(2)-resistant downhole choke devices

作　　者：程清扬 张胜利 宋一昂 王丽娜 高仁安 CHENG Qingyang;ZHANG Shengli;SONG Yi’ang;WANG Lina;GAO Ren’an(School of Geophysics and Information Technology,China University of Geosciences(Beijing),HaiDian,Beijing,China;Oil&Gas Technology Research Institute,PetroChina Huabei Oilfield Company,RenQiu,Hebei,China;Development Department,PetroChina Huabei Oilfield Company,RenQiu,Hebei,China)

机构地区：[1]中国地质大学(北京)地球物理与信息技术学院,北京海淀 [2]中国石油华北油田公司油气工艺研究院,河北任丘 [3]中国石油华北油田公司开发事业部,河北任丘

出　　处：《石油钻采工艺》2024年第5期618-634,共17页Oil Drilling & Production Technology

基　　金：华北八里西潜山油藏碳驱油碳埋存先导试验(项目编号:2023YQX10407ZK)。

摘　　要：(目的意义)针对高含二氧化碳凝析气自喷井所面临的井下工具寿命降低和凝析气可采期缩短的问题,提出了一种耐二氧化碳节流器以延长凝析气井的经济可采期。(方法过程)基于对气井中二氧化碳侵蚀机理的深入理解,对工程现场中上百例井下节流器失效案例进行了调查统计和系统分析,从目前节流器上应用的14种橡胶材料进行优选,选出9种橡胶材料开展室内力学性能评价,确定氢化丁腈橡胶可作为新型耐二氧化碳井下节流器的基础橡胶材料,而后加入碳黑和高强度填料等原材料,形成20余种耐二氧化碳橡胶材料,精选出其中的11种开展了入井耐二氧化碳试验,最终确定H-9橡胶材料作为井下节流器的橡胶密封件。此外,还将井下节流器的设计从常规结构改进为易投捞结构。(结果现象)结果表明,新型橡胶密封件材料在井筒腐蚀环境中展现出显著的抗侵蚀性能,经过4处改进的易投捞井下节流器在室内和地面投捞性能试验中表现良好,无卡顿现象。耐二氧化碳节流工艺在凝析气井的应用取得了成功,试验井现场成功应用该技术后连续生产120 d以上。(结论建议)耐二氧化碳井下节流工艺的成功应用,确保高含二氧化碳凝析气田长期可持续发展。The production of high-carbon dioxide condensate gas wells with downhole throttling devices can cause tool failure and shutdown production.Carbon-dioxide-resistant throttling devices can extend the economic recovery period of condensate gas wells.This study systematically analyzed the carbon dioxide corrosion mechanism which has been widely studied in the academic field for a long time and conducted research statistics based on the mechanism of carbon dioxide erosion in gas wells,a key investigation,statistics,and systematic analysis were conducted on hundreds of cases of downhole throttling device failure in engineering field applications.Through indoor mechanical performance experiments on nine types of downhole throttling device rubber seals,a new sealing material based on modified hydrogenated nitrile rubber was determined among 14 rubber formulas based on on-site downhole experiments.Simultaneously,the conventional design of downhole throttling devices was changed to an easy-to-throw structure,and the anti-nozzle added a stretchable pulley structure.The results showed that the improved carbon dioxide resistant throttling device applied a modified hydrogenated nitrile rubber material to make the sealing element of the downhole throttling device have good resistance to carbon dioxide corrosion and thermal expansion.At the same time,a slotted design is added to the tail of the central rod,a steel inner sleeve was added to the upper cup,and a snap spring design is added at the corresponding position.A release snap spring was added to the slip,and the new structure facilitated the operation of the downhole throttling device.After the successful application of this throttling technology in the experimental well,it was continuously produced for more than 120 days.The successful application of carbon dioxide resistant downhole throttling technology ensures the long-term sustainable development of high carbon dioxide condensate gas fields.

关 键 词：工程技术 勘探开发 井下作业 二氧化碳 提高采收率 二氧化碳吞吐 能源安全 算法 

分 类 号：TE3[石油与天然气工程—油气田开发工程]