页岩气井连续油管采气管柱优化设计

Optimal design of coiled tubing for production string of gas well in shale gas field

曹孟京 吴晓东 安永生 李鹏2

中国石油大学（北京）石油工程学院教育部重点实验室，北京 102249 胜利油田鲁胜石油开发有限公司，山东 东营 257000

MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China Lusheng Oil Development Co., Ltd., Shengli Oilfield Company, SINOPEC, Dongying 257000, China

随着连续油管技术的快速发展，连续油管作为采气管柱在页岩气井中的应用越来越广泛。为满足页岩气井安全生产、后期携液及抗冲蚀的需求，对页岩气井中的连续油管进行了优化设计，确定了采气管柱的合理尺寸。根据涪陵页岩气井的产能测试和实际生产特点，将页岩气井分为低产井、中产井、高产井，基于产能方程和井筒管流压降计算方程建立了页岩气井节点分析模型，计算了不同尺寸连续油管的协调产量、临界携液流量及抗冲蚀产气量，优选了满足不同类型页岩气井生产需求的连续油管尺寸。研究结果表明：高产井易发生冲蚀，中产井和低产井易发生井筒积液。通过连续油管优化设计，既可以保证气井的安全生产，也可以有效提高页岩气井的携液能力和抗冲蚀能力，为页岩气井高效生产提供技术支撑。

With the rapid development of coiled tubing technology, it has been available to apply coiled tubing to shale gas wells. In order to fulfill the demand of safe production, fluid carrying and anti-erosion, optimal design of coiled tubing for production string of shale gas wells has been carried out, and the rational size of production string has been determined. Based on the productivity testing and gas production, shale gas wells were divided into low-, middle- and high-production wells. Based on the productivity equation and flowing pressure drop equation, node analysis model was established to calculate the coordinate production, critical fluid carrying rate and erosion rate with different sizes of coiled tubing. Then the optimal sizes of coiled tubing in three types of shale gas wells were determined. The study results show that high-production wells are prone to erosion and liquid loading occurs easily in middle-production and low-production wells. The optimal design of coiled tubing not only could assure the safe production of shale gas wells, but would improve the capability of fluid carrying and anti-erosion, which would provide the technical support for efficient production of shale gas wells.

10.6056/dkyqt201806026