致密气井稳产时间预测模型及应用  

A model and its application of stable production period prediction of tight gas wells

作　　者：张磊 王永科 乔向阳 倪军 吴克柳 辛翠平 张涛 康宇龙[1] 许阳 冯婷婷 ZHANG Lei;WANG Yongke;QIAO Xiangyang;NI Jun;WU Keliu;XIN Cuiping;ZHANG Tao;KANG Yulong;XU Yang;FENG Tingting(Research Institute of Shaanxi Yanchang Petroleum(Group)Co.Ltd.,Xi'an 710065,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;Production Logging Center,China Petroleum Logging Co.Ltd.,Xi'an 710201,China)

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,陕西西安710065 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]西南石油大学油气藏地质与开发国家重点实验室,四川成都610500 [4]中国石油集团测井有限公司生产测井中心,陕西西安710201

出　　处：《中南大学学报（自然科学版）》2022年第3期1146-1155,共10页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50974128);北京市自然科学基金资助项目(2204093);陕西省重点研发计划项目(2021GY-167);陕西延长石油(集团)有限责任公司“揭榜挂帅”项目(ycsy2021jbgs-A-05)。

摘　　要：采用“井口—井底—产层”的逆向推演思路,首先基于气液两相流井筒压力梯度方程推导产水气井的井底流压解析模型,进而结合定容气驱产水气藏的物质平衡方程建立产水气井的平均地层压力和单井控制储量计算模型,最后以井口最低外输压力为约束条件建立产水气井的稳产时间预测模型。研究结果表明:模型的稳产时间计算误差受到实际稳产时间的影响,但计算结果满足气藏开发的实际需求。将稳产时间预测模型应用于产水气井的产量优化,优化后的气井不仅可以满足开发方案的设计要求,而且能够获得更高的内部收益率,优化效果显著,表明模型可以用于优化致密气藏产水气井的产量。Based on backward deduction strategy named as"wellhead-bottomhole-reservoir",the analytic model for bottomhole pressure in water-producing gas wells was derived using the pressure gradient equation of gas-liquid two-phase flow in wellbore.Then,calculation model of average reservoir pressure and single-well controlled reserves were established on the basis of the mass balance equation of closed elastic driving and waterproducing gas reservoir.Finally,the model of stable production period prediction of water-producing gas well was established with the constraints of minimum export pressure at wellhead.The results show that the computational error is affected by real production period,however,satisfying demand for the engineering accuracy in the development of gas reservoir.The established model can be applied to optimize practical gas wells,and the optimized gas wells are able to meet the requirements of development design and obtain a higher internal rate of return as well,which indicates the proposed model can be applied for the production optimization of water producing gas well in tight gas reservoir.

关 键 词：致密气井 井底流压 平均地层压力 单井控制储量 稳产时间预测 产量优化 

分 类 号：TE312[石油与天然气工程—油气田开发工程]