摘要
针对超深层稠油热力降黏效果差的问题,提出了CO_2吞吐降黏的开发方案。以物理模拟实验为基础,通过人造三维岩心,模拟超深层稠油直井CO_2吞吐开发过程,研究吞吐井的压力、周期产量以及不同生产阶段的产出油形态变化,并对三维岩心不同位置处由于CO_2扩散引起的压力变化规律进行了分析和探讨。研究表明:超深层稠油CO_2吞吐开发过程中,其渗流规律会发生阶段性变化,依照渗流规律的变化可将生产过程划分为CO_2回采泄压、降压稳产、稳压泄油3个阶段;从井筒到地层远端可划分为CO_2饱和区、CO_2扩散区、压力响应区3个渗流区域。研究结果为超深层稠油降黏及开发方式的优化提供了参考。
In order to solve the problem of poor efficiency of thermal viscosity reduction of ultra-deep heavy oil, a development scheme using CO2 huff and puff viscosity reduction is proposed. Based on physical simulation experiment, artificial 3D cores were used to simulate the development process of CO2 huff and puff in ultra-deep vertical heavy oil well and investigate the pressure and periodic production of huff and puff well and morphologic change of produced oil in different production stages. The rule of pressure change caused by CO2 diffusion in different posi- tions of the 3D core was analyzed and discussed. The research showed that during the development process of CO2 huff and puff for ultra-deep heavy oil, the permeability rule showed a periodic change, based on which the production process could be divided into three stages including CO2 extraction for decompression, pressure reduction for stable production and pressure stabilization for oil drainage. The flow path from wellbore to far end of the formation ccould be divided into three permeability zones including CO2 saturation region, CO2 diffusion region and pressure response region. The research result provides reference for viscosity reduction and optimization of development method for ultra-deep heavy oil reservoir.
出处
《特种油气藏》
CAS
CSCD
北大核心
2017年第4期142-146,共5页
Special Oil & Gas Reservoirs
基金
中国石化科研项目"垦西油田罗322超深层低渗稠油有效开发技术"(P14009)
关键词
超深层稠油
二氧化碳吞吐
渗流规律
三维岩心
模拟实验
ultra-deep heavy oil
CO2 huff and puff
permeability rule
3D core
simulation experiment
