Study on the Ground Measurements of Key Parameters of Tubing Leakage Point in Sustained Annular Pressure Gas Well

Cao Feng, Luo Heng, Dang Ruirong, Huifeng Zheng
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引用次数: 1

Abstract

Sustained annular pressure (SCP) is a common phenomenon in offshore gas fields, which poses a threat to the integrity of gas Wells. Among all the causes, the leakage of tubing string poses the greatest threat to the safety of production. In production practice, it is necessary to measure the key parameters of the leakage point to evaluate the risk. Aiming at this demand, the gas flow model in tubing and the pressure build up model in A-annulus are established. A method to determine the key parameters of leakage point was proposed based on the dynamic liquid level test and annular pressure releasing down test. Through analyzing the flow conditions of leakage point at different data points, the cross-validation method of test data was presented. This method not only provides two kinds of optional test methods for key parameters of leakage point, but also evaluates the reliability of test data, so it has a good value of popularization in offshore gas fields.
环空持续压力气井油管泄漏点关键参数地面测量研究
持续环空压力(SCP)是海上油气田普遍存在的现象,对气井的完整性构成威胁。在所有原因中,管柱泄漏对安全生产的威胁最大。在生产实践中,有必要对泄漏点的关键参数进行测量,以评估其风险。针对这一需求,建立了油管内气体流动模型和a环空内压力积累模型。提出了一种基于动态液位试验和环空泄压试验确定泄漏点关键参数的方法。通过分析不同数据点泄漏点的流动情况,提出了试验数据的交叉验证方法。该方法不仅为泄漏点关键参数提供了两种可选的测试方法,而且对测试数据的可靠性进行了评价,因此在海上气田具有很好的推广价值。
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