一种新型油藏隔离阀在海上水平裸眼气井中的应用

Applications of a novel reservoir isolation valve in offshore horizontal openhole wells

万宏春 李艳飞 葛俊瑞 蔡斌 吴健

WAN Hongchun LI Yanfei GE Junrui CAI Bin WU Jian

中海油能源发展股份有限公司上海工程技术公司 中海石油(中国)有限公司上海分公司

Shanghai Engineering Technology Branch, CNOOC Energy Technology & Services Limited, Shanghai 200335, China Shanghai Branch of CNOOC Limited, Shanghai 200335, China

针对水平裸眼气井完修井面临储层保护难度大、井筒清洁效率低、井控安全风险高等难题，设计了一种新型机械式油藏隔离阀。新型油藏隔离阀是一种机械式可重复开关球阀，由专用开关工具打开和关闭球阀，油藏隔离阀与悬挂封隔器组成的隔离系统可以防止球阀上部流体向下流动，又可以防止球阀下部流体及气体向上流动。对油藏隔离阀球阀密封性能、球阀开关操作、球阀重入密封性能进行了室内试验，验证了此新型油藏隔离阀性能安全可靠。现场试验表明，该工具结构合理、性能可靠，可实现工作液零漏失，井筒清洁效率高，经济实用。该油藏隔离阀为实现油气井全寿命周期储层保护提供了一种安全有效的技术手段。

Given the high difficulties in formation damage prevention, low efficiency of well clean-up and high risks of well control of well completion and workover of horizontal openhole gas wells, a novel mechanical reservoir isolation valve was developed. This mechanical ball valve with repeatable switching is opened and closed by a specialized switching tool. The isolation system composed of the reservoir isolation valve and suspension packer forbids both the downward flow of fluids above the ball valve and upward flow of fluids below the ball valve and gas in the reservoir. The ball valve sealing performance, switch operation and ball valve re-entry sealing performance of the reservoir isolation valve were investigated via laboratory experiments, which validates the safety and performance reliability of the invention. Field testing demonstrated that the presented tool, with reasonable structures and reliable performance, can achieve zero leakage of working fluids and deliver high efficiency of well clean-up and cost-effectiveness of operations. This invention provides a safe and effective technical approach for life-cycle formation damage prevention in oil and gas wells.

10.13639/j.odpt.202212015