顺北一区断溶体油藏溶解气驱开发特征  

Development Characteristics of Solution⁃Gas Drive in Fault⁃Karst Reservoirs in Shunbei⁃1 Block

作　　者：刘学利[1,2] 谭涛[1,2] 陈勇[1,2] 解慧[1,2] 朱苏阳[3] 吴昊镪 向东流 LIU Xueli;TAN Tao;CHEN Yong;XIE Hui;ZHU Suyang;WU Haoqiang;XIANG Dongliu(Sinopec,Research Institute of Exploration and Development,Northwest Oilfield Company,Urumqi,Xinjiang 830011,China;Sinopec,Key Laboratory of Enhanced Recovery for Fracture-Cavity Reservoirs,Urumqi,Xinjiang 830011,China;State Key Laboratory of Reser-voir Geology and Development Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,China)

机构地区：[1]中国石化西北油田分公司勘探开发研究院,乌鲁木齐830011 [2]中国石化缝洞型油藏提高采收率重点实验室,乌鲁木齐830011 [3]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500

出　　处：《新疆石油地质》2023年第2期195-202,共8页Xinjiang Petroleum Geology

基　　金：中国石化缝洞型油藏提高采收率重点实验室2022年度开放基金(34400000-22-ZC0607-0008)。

摘　　要：为确定顺北一区断溶体油藏是否有溶解气驱,通过油藏数值模拟,表征了断溶体油藏溶解气驱的特点;基于油藏工程,分析了顺北一区断溶体油藏的溶解气驱特征。研究表明,由于顺北断溶体油藏厚度大,在井底附近和油藏顶部同时发生组分重力分异,大量溶解气未被采出,形成次生气顶,发挥了溶解气的弹性能,使得井底流压的下降变缓,同时一定程度上增加了单井的动态储量,这个过程伴随着油相驱动指数的下降。随着溶解气进一步析出,次生气顶侵入井底,从而造成产油量快速递减。因此,在顺北一区断溶体油藏衰竭开发过程中,可在一定程度上利用溶解气驱,但仍需保压开发,不可任由溶解气进一步析出。In order to confirm whether there is solution⁃gas drive in the fault⁃karst reservoirs in the Shunbei⁃1 block,reservoir numerical simulation was performed to characterize the solution⁃gas drive in the fault⁃karst reservoirs.Based on the reservoir engineering method,the solution⁃gas⁃drive characteristics of the fault⁃karst reservoirs in the Shunbei⁃1 block were analyzed.The study shows that due to the large thickness of the fault⁃karst reservoirs in the study area,component gravity differentiation occurs simultaneously near the bottom of the well and at the top of the reservoir,leaving a large amount of solution⁃gas unproduced and forming a secondary gas cap.Under the action of the elastic energy of solution⁃gas,the decline of bottomhole flow pressure slows down,and the dynamic reserves of a single well increase to a certain extent.This process is accompanied by the decline in oil⁃phase driving index.With the further development of solution⁃gas drive,the secondary gas cap invades the bottom of the well,resulting in a rapid decline of oil production.Therefore,during the depletion develop⁃ment of the fault⁃karst reservoirs in the Shunbei⁃1 block,the solution⁃gas drive can be used to a certain extent together with development under pressure.

关 键 词：塔里木盆地 顺北一区 断溶体油藏 溶解气驱 次生气顶 油藏工程 数值模拟 

分 类 号：TE155[石油与天然气工程—油气勘探]