摘要
边水气藏水平井见水后产量下降,准确预测见水时间有利于选择合理的开发及配产方式、提高边水气藏采收率。考虑水侵速度、储层倾角及气相非达西效应等因素,建立边水气藏水平井见水时间预测模型;计算P边水气藏W井的见水时间,与未考虑水侵速度等因素的见水时间对比,并对影响因素进行敏感性分析。结果表明:水侵过程中,水质点向井底移动的速度为水侵速度与舌进速度的迭加,存在一个临界边界可将水质点运移过程分为纯水侵阶段和水侵迭加舌进阶段;预测模型计算结果与实际见水时间基本吻合,相对误差为-5.9%,验证模型可靠性;对见水时间产生正向影响的因素为储层有效厚度、储层倾角、水平井长度及水平井与气水边界的初始距离,产生负向影响的因素为水侵速度及气井产量,气相非达西效应影响甚微;影响水平井见水时间的主要因素由强到弱依次为气井产量、水侵速度、水平井与气水边界的初始距离、储层有效厚度、储层倾角和水平井长度。该结果为边水气藏水平井合理配产及提高采收率提供依据。
The production of horizontal wells in gas reservoir with edge water decreases after water breakthrough,accurate prediction of water breakthrough time is conducive to selecting reasonable development plan and production schedule,so as to improve the gas recovery of gas reservoirs with edge water.Considering the water invasion velocity,reservoir dip angle and non-Darcy effect of gas phase,the prediction model of water breakthrough time of horizontal wells in edge water gas reservoir is established.Based on the new model,the water breakthrough time of well W in edge water gas reservoir P is calculated and compared with the water breakthrough time without considering water invasion velocity.Finally,the sensitivity analyses are carried out.The results show that in the process of water invasion,the velocity of water body point moving to the well bottomhole is the superposition of water invasion velocity and tongue advancing velocity,and there is a critical boundary,which can divide the whole migration process of water quality point into two stages:pure water invasion stage and water invasion plus tongue advancing stage.The calculation results of the new model are basically consistent with the actual water breakthrough time,and the relative error of the calculation results is only-5.9%.The new model has high reliability.The factors that have positive impacts on the water breakthrough time include the effective thickness of the reservoir,the dip angle of the reservoir,the length of the horizontal well,and the initial distance between the horizontal well and the gas-water boundary.The negative impacts include the water invasion velocity and gas well production,on while non-Darcy effect of gas phase has little effect.The main factors affecting the water breakthrough time of horizontal wells from strong to weak are gas well production,water invasion velocity,initial distance between horizontal well and gas-water boundary,reservoir effective thickness,reservoir dip angle,and horizontal well length.The research results provide a certain theoretical basis and technical support for the rational production allocation of horizontal wells in edge water gas reservoirs and improving the gas recovery of such gas reservoirs.
作者
石军太
张龙龙
羊新州
洪舒娜
李星浩
李文斌
鲁家国
SHI Juntai;ZHANG Longlong;YANG Xinzhou;HONG Shu'na;LI Xinghao;LI Wenbin;LU Jiaguo(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;Coalbed Methane Research Center,China University of Petroleum(Beijing),Beijing 102249,China;Shenzhen Branch of CNOOC,Shenzhen,Guangdong 518054,China)
出处
《东北石油大学学报》
CAS
北大核心
2022年第1期104-112,I0007,I0008,共11页
Journal of Northeast Petroleum University
基金
山西省科技重大专项(20201101002)
中国石油大学(北京)优秀青年学者基金项目(2462020QNXZ003)。
关键词
边水气藏
水驱
非达西效应
水平井
水侵机理
见水时间
预测模型
gas reservoirs with edge water
water drive
non-Darcy effect
horizontal well
water invasion mechanism
water breakthrough time
prediction model
