CO_2吞吐降压开采模拟实验研究  

SIMULATION TEST ON CO_2 HUFF-N-PUFF DEPRESSURIZATION PRODUCTION

作　　者：刘博[1] 

机构地区：[1]中石化胜利油田分公司桩西采油厂

出　　处：《钻采工艺》2017年第2期41-44,8,共4页Drilling & Production Technology

基　　金：中石化胜利油田分公司科技攻关项目"边底水油藏水平井注CO_2控水增产技术研究"(编号:YKC1309)资助

摘　　要：文章通过长岩心填砂管物理模拟实验,分析了CO_2吞吐降压开采过程各阶段的特征,研究了生产压差、降压开采方式、注入量、注入速度及关井时间对CO_2吞吐效果的影响。实验结果表明,中低黏度原油开采、气体驱动开采阶段为CO_2吞吐降压开采主要的产油阶段;多周期吞吐时增产原油主要依靠气体驱动阶段,增产原油机理主要是溶气驱的作用;实验得到换油率最高时CO_2的注入压力为5 MPa,CO_2注入量为0.166 8 mol,关井平衡时间为6 h;降压开采时存在一个合理的生产压差值。研究结果可为CO_2吞吐注采参数的优选提供有力依据。In this paper,through the physical simulation experiments on long-core sand packed tube,each stage of CO_2huff-n-puff depressurization production was analyzed,and the effects of production pressure differential,depressurization stimulation method,injection volume,injection rate and shut-in time on CO_2huff-n-puff stimulation were studied. The experimental results showed that the low-medium viscosity crude oil production and gas-drive production stage were the main oil production stage for CO_2huff-n-puff stimulation. For multi-cycle stimulation,the oil production improvement mainly produced by the solution gas drive during gas-drive stage. The highest oil replacement ratio was obtained when the CO_2 injection pressure being5 MPa,the CO_2 injection volume 0. 1668 mol,and the balance time after shut-in 6h. And the optimal production was obtained at a certain reasonable production pressure differential. This experimental study will provide powerful reference for the optimization of CO_2huff-n-puff stimulation parameters.

关 键 词：长岩心 物理模拟 CO2吞吐 降压开采 研究 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]