欠饱和煤层气藏压裂水平井动态储量计算方法研究  

Research on Dynamic Reserve Calculation Methods for Multi-fractured Horizontal Wells in Under-saturated Coalbed Methane Reservoirs

作　　者：尹鑫漫 李靖[1] 张涛[2] 王玫珠[3] 张晟庭 石军太[1] 李相方[1] 冯绪兴 郝少伟 Yin Xinman;Li Jing;Zhang Tao;Wang Meizhu;Zhang Shengting;Shi Juntai;Li Xiangfang;Feng Xuxing;Hao Shaowei(MOE-Key Laboratory of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;Project Management Department,Shanxi Yanchang Petroleum(Group)Co.,Ltd.,Yan'an 716000,China;Research Institute of Petroleum Exploration and Development,Beijing 100083,China;Shanxi Lu'an Jinyuan Coalbed Methane Development Co.,Ltd.,Changzhi 046204,China)

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室,北京102249 [2]陕西延长油田股份有限公司工程管理部,延安716000 [3]中国石油勘探开发研究院,北京100083 [4]山西潞安金源煤层气开发有限责任公司,长治046204

出　　处：《水动力学研究与进展（A辑）》2024年第5期734-745,共12页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金项目(52104051);中国石油大学(北京)启动基金项目(2462021QNXZ002)。

摘　　要：多级压裂水平井已成为非常规油气藏技术勘探开发过程中最常用的技术之一。相比页岩气而言,煤层气普遍存在气水两相,生产特征更为复杂。目前,基于煤层气藏压裂水平井气水两相阶段数据,反演地层参数的研究相对较少。该文针对欠饱和煤层气藏,通过不稳定产量分析,建立了一套完整且闭环的反演储层及水力裂缝性质的工作流程。研究结果表明:欠饱和煤层气藏压裂水平井可划分为5个流动阶段;单相水阶段通过耦合Wattenbarger典型曲线法与复合线性流典型曲线法可得到地层参数;气水两相流阶段下,运用叠加时间会使得生产数据点呈现不规律分布,分析前应去除噪点的影响。为论证所提出工作流程的可行性与适用性,对实际煤层气藏开展分析,验证了所提出工作流程的正确性,该研究结果可为煤层气压裂水平井不稳定产量分析提供依据。Multi-fractured horizontal wells have become one of the most common technologies for developing unconventional oil and gas reservoirs.Compared with shale gas reservoirs,coalbed methane reservoirs have more complex production characteristics,as the two phases of gas and water are generally existed in it.Few studies have been conducted in coalbed methane reservoir,especially on gas-water two-phase flow.In this paper,by obtaining the production rate and bottomhole pressure of a single well,a comprehensive work flow has been developed to obtain the formation parameters and hydraulic-fracture properties.The studies show that the flow regime of multi-fractured horizontal wells in under-saturated coalbed methane reservoirs can be divided into five stages.In single-phase water stage,the formation parameters can be obtained by coupling the Wattenbarger type-curve method and Compound linear flow type-curve method.In gas-water two-phase flow,the noise points should be removed before analysis so as to diminish the influence of the application of superposition time which will exhibit irregular distribution in the square-root of time method.To demonstrate the feasibility and practicability of the developed work flow,an actual coalbed methane reservoir has been analyzed.The consistent assessment results for field cases validate the proposed method.The method presented in this paper can provide basis for rate-transient analysis of fractured wells in coalbed methane reservoirs.

关 键 词：欠饱和煤层气 多级压裂水平井 不稳定产量分析 单相水阶段 气水两相阶段 

分 类 号：TE353[石油与天然气工程—油气田开发工程]