边底水裂缝性气藏布井方式和注气对开采效果影响实验研究  

Experimental study on influence of well layout and gas injection on production effect of edge and bottom water fractured gas reservoir

作　　者：刘加兴 张跃[2] 卢祥国[1] 殷庆国[3] 陈鹤昂 肖京池 罗云龙 田中原 Liu Jiaxing;Zhang Yue;Lu Xiangguo;Yin Qingguo;Chen He′ang;Xiao Jingchi;Luo Yunlong;Tian Zhongyuan(Key Laboratory of the Ministry of Education for Improving Oil and Gas Recovery,Northeast Petroleum University,Daqing 163318,China;Research Institute of Exploration and Development of Daqing Oilfield Co.,Ltd.,Daqing 163712,China;Petroleum Engineering Research Institute,Dagang Oilfield Company,Tianjin 300280,China;Petroleum Engineering Supervision Center,Sinopec Southwest Oil and Gas Branch,Deyang 618099,China;Hainan Branch of CNOOC(China)Co.,Ltd.,Haikou 570100,China)

机构地区：[1]东北石油大学提高油气采收率教育部重点实验室,黑龙江大庆163318 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [3]大港油田公司石油工程研究院,天津300280 [4]中国石化西南油气分公司石油工程监督中心,四川德阳618099 [5]中海石油(中国)有限公司海南分公司,海南海口570100

出　　处：《能源与环保》2023年第10期103-110,共8页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：中国石油勘探开发研究院重点科研攻关项目(2020RIPED-LEEY)。

摘　　要：为了探索布井方式和注气对边底水裂缝性气藏开采效果的影响和作用机制,以孔隙型和孔隙/裂缝型岩心为基础,将不同岩心串联形成边底水裂缝性气藏物理模拟模型,在此模型上开展布井方式和注气对气藏开采效果影响评价实验,探究了水侵影响气藏采收率的作用机制。同时,为了保证仿真模型与目标气藏地质结构和空间特点相似,研制了基质/孔隙、基质/裂缝型岩心。结果表明,当岩石渗透率较低时,水相毛管力急剧增大,难以发生“水封气”现象,由此引起的气体动态储量减小。因此,在边底水裂缝性气藏内远离裂缝发育的低渗区布井开采效果要优于高渗区布井。当气井位于裂缝性气藏低渗区时,气井生产过程中高渗区部分气体会沿裂缝运移到低渗区,致使高渗区压力降低,水侵量增加。此外,由于高渗区气体压力较低,“水封气”储量较小,因而该区域上实施注气开采效果较差。In order to explore the influence and mechanism of well layout and gas injection on the exploitation effect of edge and bottom water fractured gas reservoir,a physical simulation model of edge and bottom water fractured gas reservoirs was formed by connecting different rock cores based on pore and pore/fracture type cores.On this model,the evaluation experiment of the influence of well layout and gas injection on the exploitation effect of gas reservoir was carried out,and the mechanism of water invasion affecting the recovery rate of gas reservoir was explored.At the same time,in order to ensure that the simulation model was similar to the geological structure and spatial characteristics of the target gas reservoir,"matrix-pore-type"and"matrix-fracture-type"cores are developed.The results show that when the rock permeability is low,the water capillary force increases sharply,and it is difficult to produce the phenomenon of"water sealed gas",the resulting decrease in gas dynamic reserves.Therefore,the production effect of well layout in low permeability areas far from the development of fractures in edge and bottom water fractured gas reservoirs is better than that in high permeability areas.When the gas well is located in the low permeability area of fractured gas reservoir,part of the gas in the high permeability area will migrate to the low permeability area along the fracture in the production process of gas well,resulting in the decrease of pressure in the high permeability area and the increase of water influx.In addition,due to the low gas pressure in the high permeability area and the small reserves of"water sealed gas",the effect of gas injection production in this area is poor.

关 键 词：岩心制作 边底水裂缝性气藏 布井方式 开采效果 物理模拟 

分 类 号：TE371[石油与天然气工程—油气田开发工程]