摘要：Gas injection serves as a main enhanced oil recovery (EOR) method in fractured-vuggy carbonate reservoir, but its effect differs among single wells and multi-well groups because of the diverse fractured-vuggy configuration. Many researchers conducted experiments for the observation of fluid flow and the evaluation of production performance, while most of their physical models were fabricated based on the probability distribution of fractures and caves in the reservoir. In this study, a two-dimensional physical model of the karst fault system was designed and fabricated based on the geological model of TK748 well group in the seventh block of the Tahe Oilfield. The fluid flow and production performance of primary gas flooding were discussed. Gas-assisted gravity flooding was firstly introduced to take full use of gas-oil gravity difference, and its feasibility in the karst fault system was examined. Experimental results showed that primary gas flooding created more flow paths and achieved a remarkable increment of oil recovery compared to water flooding. Gas injection at a lower location was recommended to delay gas breakthrough. Gas-assisted gravity flooding achieved more stable gas-displacing-oil because oil production was at a lower location, and thus, the oil recovery was further enhanced.

关键字：Gas injection Remaining oil Enhanced oil recovery Geology-based physical model Karst fault system

ISSN号：1672-5107

卷、期、页：卷: 17 期: 2 页: 419-433

发表日期：2020-04-01

影响因子：2.095600

期刊分区（SCI为中科院分区）：二区

收录情况：SCIE（科学引文索引网络版）,CSCD（中国科技引文期刊）（核心）

发表期刊名称：PETROLEUM SCIENCE

通讯作者：李梦,赵闯

第一作者：宋兆杰,杨钰龙,侯吉瑞

论文类型：期刊论文

论文概要：宋兆杰,李梦,赵闯,杨钰龙,侯吉瑞，Gas injection for enhanced oil recovery in two-dimensional geology-based physical model of Tahe fractured-vuggy carbonate reservoirs: karst fault system，PETROLEUM SCIENCE，2020，卷: 17 期: 2 页: 419-433

论文题目：Gas injection for enhanced oil recovery in two-dimensional geology-based physical model of Tahe fractured-vuggy carbonate reservoirs: karst fault system