鲜波,朱松柏,周杰,聂延波,范秋海
XIAN Bo,ZHU Songbai,ZHOU Jie,NIE Yanbo,FAN Qiuhai

• 1:中国石油塔里木油田分公司

摘要(Abstract)：

为了更准确地认识缝洞型碳酸盐岩气藏产量递减规律，假设气藏顶底边界和外边界封闭，储集层水平等厚，建立了斜井三孔单渗和三孔双渗的Blasingame产量递减模型。采用拉普拉斯变化等数学方法求解模型，得到井底压力解并将其代入转换方程后获得递减产量解，再通过数值反演得到真实空间下的产量解。绘制且对比了斜井三孔单渗和三孔双渗Blasingame产量递减曲线，并对斜井三孔双渗的产量递减曲线进行了参数敏感性分析。结果表明：斜井三孔双渗产量递减曲线位置在初期比单渗的产量递减曲线位置更低，且窜流凹子更浅；裂缝渗透率比值越大，窜流凹子越深、曲线位置越低；窜流系数越大，窜流发生越早、曲线位置左移；基质弹性储容比越大，基质向裂缝窜流的窜流凹子越宽越深、溶洞向裂缝窜流的窜流凹子越窄越浅；斜井长度越长、井斜角越大，产量递减曲线位置越高且曲线向左移动；结合现场实例井解释，斜井三孔双渗模型比斜井三孔单渗模型拟合效果更好、解释结果更可靠。建立的单双渗模型和绘制的Blasingame产量递减曲线可预测碳酸盐岩气藏斜井的产量递减规律。
In order to understand production decline law of fractured-vuggy carbonate gas reservoirs more accurately, Blasingame production decline models for triple-porosity single-permeability and triple-porosity dual-permeability of deviated wells are established assuming that top and bottom boundaries of gas reservoirs and outer boundaries are closed, and reservoir thickness is horizontally uniform. Models are solved by mathematical method of Laplace transformation to obtain bottom hole pressure solution, which is substituted into conversion equation to obtain production declination solution, and then obtain production solution in real space through numerical inversion. Blasingame production decline curves of deviated wells with triple-porosity single-permeability and triple-porosity dualpermeability are plotted and compared, and parameters sensitivity is analyzed for production decline curves of deviated wells with triple-porosity dual-permeability. The results show that the position of production decline curve of triple-porosity dual-permeability is lower than that of single-permeability in initial stage, with shallower interporosity flow concave. The higher the fracture permeability ratio is, the deeper the interporosity flow concave is, and the lower the curve position is. The larger the interporosity flow coefficient is, the earlier the interporosity flow occurs, with curve position shifting leftward. The higher the elastic storativity ratio of matrix is, the wider and deeper the interporosity flow concave of matrix-to-fracture is, and the narrower and shallower the interporosity flow concave of vug-tofracture is. The longer the well length and the larger the deviation angle of deviated well are, the higher the position of production decline curve is, with curve shifting leftward. Combined with field case well interpretation, triple-porosity dual-permeability model of deviated well has better fitting effect and more reliable interpretation result than triple-porosity single-permeability model. Established single-permeability and dual-permeability models and plotted Blasingame production decline curves can predict production decline law of deviated wells in carbonate gas reservoirs.

关键词(KeyWords)： 碳酸盐岩气藏;斜井;双渗;Blasingame产量递减曲线;敏感性分析
carbonate gas reservoirs;deviated well;dual-permeability;Blasingame production decline curve;sensitivity analysis

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份有限公司攻关性应用性科技专项“超深层油气藏提高采收率关键技术研究与应用”（2023ZZ14YJ04）

作者(Author): 鲜波,朱松柏,周杰,聂延波,范秋海
XIAN Bo,ZHU Songbai,ZHOU Jie,NIE Yanbo,FAN Qiuhai

DOI: 10.19597/J.ISSN.1000-3754.202308042

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