安塞油田长10油藏注气开发方式研究

A Study of Gas Injection Mode for Chang 10 Reservoir in Ansai Oilfield

安塞油田长10油藏是近年发现的新层系油藏,其天然能量不足,自然能量开发递减大,室内水驱油实验评价注水补充能量开发效果不理想,现场注水开发试验过程中暴露出注水井注入压力高,部分注水井注不进的问题。根据长10油藏特征,通过室内试验、油藏数值模拟及油藏工程研究,优化出安塞油田长10特低渗透油藏注干气合理的注气方式、气水交替驱段塞尺寸、注入时机等技术政策,指导了长10油藏注气开发试验,积极探索了鄂尔多斯盆地特低渗透油藏补充能量开发的新方式。

Chang 10 Reservoir of Ansai Oilfield was a new reservoir.Its natural energy was insufficient,its development was highly declined.Laboratory experiment evaluation on the effect of water flooding was not ideal.Field water flooding had high injection pressure in water injection wells,water could not be injected into part of the injection wells.According to the characteristics of the reservoir,technical policies of reservoir development of Chang 10 extra-low permeability reservoir such as reasonable gas injection mode,slug size of gas and water alternation,gas injection time are determined in Ansai Oilfield through laboratory experiments,oil reservoir simulation and reservoir engineering study.It provides guidance for gas injection development test of Chang 10 reservoir,and it actively explores the new mode ultra-low permeability reservoir development in Ordos Basin.