平衡式双解封注水封隔器的研制与应用  

Development and Application of Equilibrium Dual Unseating Water Injection Packer

作　　者：肖国华[1] 刘宇飞[1] 张鑫 王远征[1] 张建忠[1] 路明[1] 王瑶[1] Xiao Guohua;Liu Yufei;Zhang Xin;Wang Yuanzheng;Zhang Jianzhong;Lu Ming;Wang Yao(Petrochina Jidong Oilfield Company,Tangshan,Hebei 063004,China;Petrochina Yumen Oilfield Company,Jiuquan,Gansu 735200,China)

机构地区：[1]中国石油冀东油田分公司,河北唐山063004 [2]中国石油玉门油田分公司,甘肃酒泉735200

出　　处：《特种油气藏》2024年第5期155-161,共7页Special Oil & Gas Reservoirs

基　　金：中国石油冀东油田分公司科技项目“新型分注工具研制与应用”(SY2020-02)。

摘　　要：针对冀东油田大斜度深井多级分注管柱解封负荷大、密封有效期短的问题,在剖析封隔器结构的基础上,对关键结构进行三维仿真模拟优化设计,研制了平衡式双解封注水封隔器。该封隔器设计独立的双解封方式,减小解封负荷;利用弹簧及注水管柱内外压差,实现反洗阀自动关闭;综合采用橡胶挤压及金属线密封方式,提高反洗阀密封可靠性;胶筒优选高强度氟橡胶材质,提高耐温耐压性能;设计平衡活塞保护解封销钉,消除高压差提前解封风险。现场应用11井次,施工成功率为100%,密封有效期超过30个月;起管解封负荷降低17.2%。该封隔器密封周期长,解封负荷小,可满足大斜度深井高压分注长效密封需求,具有良好的经济效益和推广应用前景。To address the issues of high unsealing load and short sealing validity period in the multi-stage injection string unsealing of highly deviated deep well in Jidong Oilfield,an equilibrium dual unseating water injection packer is developed through 3D simulation and optimization design of key structures based on the analysis of the packer structure.The packer is equipped with an independent dual unseating mode to minimize unseating load.It utilizes the spring and the pressure difference between the interior and exterior of the water injection string for automatic closing of the backwash valve.A combination of rubber extrusion and metal wire seating methods is employed to enhance the seating reliability of the backwash valve.High-strength fluorine rubber material has been selected to improve the temperature and pressure resistance of the rubber cylinder,while a equilibrium piston is designed to protect the unseating pin,eliminating the risk of premature unseating due to high pressure difference.The technology has been successfully deployed in 11 wells,achieving a flawless construction success rate of 100%and surpassing a seating validity period of 30 months.The unseating load of the lifting has been reduced by 17.2%.With an extended seating cycle and decreased unseating load,this packer effectively meets the long-term seating requirements for high-pressure separate injection in highly deviated deep wells,presenting promising economic benefits and application prospects.

关 键 词：大斜度深井 注水封隔器 解封负荷 密封有效期 精细注水 

分 类 号：TE928[石油与天然气工程—石油机械设备]