环空带压井泄漏量计算新方法

气井完整性理念的逐步推广使得各大油气田越来越重视环空带压气井的完整性管理与评价。环空泄漏速率是气井完整性评价的关键参数之一，但高温、高压、含酸性气体气井的泄漏速率测量风险及成本较高，现场操作中难以获取。为了获取气井井底泄漏速率参数以辅助完整性评价，文章基于安全阀泄漏模型和小孔泄漏模型，结合环空带压气井井身特征，从模型机理角度分析其应用于环空泄漏速率计算的思路，并明确了模型参数。通过实例井计算对两种泄漏模型的应用进行了对比，验证了其合理性及可行性。文章研究内容为环空带压气井的泄漏量评价提供了理论依据，为气井完整性管理研究发展起到了促进作用。

Study on New Calculation Method of Well Leakage in Gas Well with Annular Pressure

The gradual promotion of the concept of gas well integrity has made major oil and gas fields pay more and more attention to the integrity management and evaluation of gas wells with annular pressure. Annular leakage rate is one of the key parameters for gas well integrity evaluation. However, the leakage rate measurement of high-temperature, high-pres-sure, and acid containing gas wells has high risks and costs, which are often difficult to obtain in field operations. In order to obtain the bottom hole leakage rate parameters of the gas well to assist the integrity evaluation, this article is based on the safety valve leakage model and the small hole leakage model, combined with the characteristics of the gas well with annulus pressure, the idea of applying the annulus leakage rate calculation from the perspective of model mechanism is analyzed, and the model parameters are clarified as well. The application of the two leak models is compared by case wells calculation, which verifies their rationality and feasibility. The research of this paper provides a theoretical basis for the leakage evaluation of gas well with annular pressure, and promotes development of gas well integrity management research.