腰英台油田CO_2驱油先导试验研究

Pilot Study on CO_2 Displacement in Yaoyingtai Oilfield

为改善特低孔特低渗油田开发效果,同时解决高产出二氧化碳气田碳排放问题,2011年在腰英台油田DB33区块开展CO_2驱先导试验,积极探索特低渗高含水裂缝油藏CO_2驱油提高采收率经验。先导试验分为连续注气和水气交替两个主要阶段,12注31采,覆盖储量159.6万吨。本文从CO_2非混相驱油机理进行研究,结合试验区生产动态和产出物分析,提出腰英台油田CO_2驱油的见效标准,总结了CO_2驱油的见效规律,为今后特低渗油田注CO_2开发提供了科学依据。

In order to improve the development effect of ultra-low porosity and low permeability oilfields, and solve the carbon emission problem of gas fields with high carbon dioxide yield, pilot study on CO2 flooding was carried out in Yaoyingtai oilfield DB33 block, and the experience of increasing recovery of CO2 flooding in low permeability and high water-cut reservoirs was explored. The pilot study was divided into two main stages： pure gas injection and gas-water alternate injection. There were 12 injecting wells and 31 producing wells, and covered reserves was 1 596 kt. In this paper, the mechanism of CO2 immiscible displacement was studied, and combined with dynamic production and output analysis, the effectiveness standard of CO2 flooding in Yaoyingtai oilfield was put forward, effectiveness regularities of CO2 flooding were summarized, which could provide a scientific basis for the development of CO2 displacement.