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气井变产量弹性二相法的应用 被引量:2

Application of elastic two phase method with variableproduction in gas wells
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摘要 对于一口新气井,在气井产量保持稳定的条件下进行井底流压的压降曲线测试是一项重要的工作。气井的压降曲线分为非稳定阶段、过渡阶段和拟稳定阶段。其中非稳定阶段又称为弹性一相,拟稳定阶段称为弹性二相。前者的测试资料可用于确定气层的有效渗透率和气井的表皮系数,后者的测试资料主要用于评估气井控制的原始地质储量。然而,对于致密低渗透气层,气井压裂后的产量不能保持稳定,而是处于递减状态。本文提出了由压力一次方和压力二次方分别表示的变产量压降曲线拟稳定阶段的弹性二相法关系式,可用于评估定容气藏的原始地质储量。实例应用表明2种方法实用有效且评估结果基本相同。 For a new gas well,it is an important work to test the pressure drawdown curve of the bottom-hole flowing pressure under the condition of stable gas well production.The pressure drawdown curves of gas wells can be divided into the unsteady state stage,transition stage,and pseudosteady state stage.The unsteady state stage is also called the elastic one phase,and the pseudosteady state stage is called the elastic two phase.The former test data can be used to determine the effective permeability of gas reservoirs and the skin coefficient of gas wells;the latter test data are mainly used to evaluate the original gas in place controlled by a gas well.However,for tight and low permeability gas reservoirs,the production of a gas well after fracturing cannot remain stable and is decreasing.The elastic two phase method relationships of the pseudosteady stage of the pressure drawdown curves with a variable production which are expressed by pressure and pressure-squared respectively are proposed in this paper,and they can be used to evaluate the original gas in place of the volumetric gas reservoir.The practical application shows that these two methods are practical and effective,and the evaluation results are basically the same.
作者 陈元千 王鑫 CHEN Yuanqian;WANG Xin(Research Institute of Petroleum Exploration&Development,PetroChina,Beijing City,100083,China)
出处 《油气地质与采收率》 CAS CSCD 北大核心 2023年第5期63-66,共4页 Petroleum Geology and Recovery Efficiency
关键词 气井 变产量 拟稳定阶段 弹性二相法 应用 评估 gas well variable production pseudosteady stage elastic two phase method application evaluation
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