吐哈探区稠油油藏注气吞吐适应性评价  

Adaptability Evaluation of Gas Huff⁃n⁃Puff in Heavy Oil Reservoirs in Tuha Exploration Area

作　　者：夏正春 赵健 刘锋 秦恩鹏 蔡必金 王奇 XIA Zhengchun;ZHAO Jian;LIU Feng;QIN Enpeng;CAI Bijin;WANG Qi(Research Institute of Exploration and Development,Tuha Oilfield Company,PetroChina,Hami,Xinjiang 839009,China)

机构地区：[1]中国石油吐哈油田分公司勘探开发研究院,新疆哈密839009

出　　处：《新疆石油地质》2023年第3期341-346,共6页Xinjiang Petroleum Geology

基　　金：中国石油前瞻性基础性技术攻关项目(2021DJ1406)。

摘　　要：针对吐哈探区稠油油藏注气吞吐效果差的问题,利用PVT分析技术模拟稠油油藏的高温高压环境进行注气吞吐实验,通过稠油油藏注二氧化碳、天然气和氮气吞吐开发实验,从降黏效果、溶解膨胀作用、泡沫油流区间以及吞吐后残留稠油物性特征4个方面,对不同注入气进行适应性评价。结果表明,注二氧化碳吞吐对稠油降黏、溶解膨胀和形成泡沫油流区间的效果最佳,但吞吐后对油藏残留稠油物性特征影响大,主要表现在吞吐后导致油藏残留稠油黏度增大和溶解气的能力下降,不利于油藏进行多轮次注气吞吐开发;注天然气吞吐的效果及影响略次于注二氧化碳,注氮气吞吐的效果最差,但吞吐后对油藏残留稠油物性特征影响小。The performance of gas huff-n-puff in heavy oil reservoirs in the Tuha exploration area are declining.Gas huff-n-puff experi-ments were conducted by using PVT analysis technology to simulate high-temperature and high-pressure environment in the heavy oil reser-voirs.CO_(2),natural gas,and nitrogen were injected respectively into the reservoirs,and then evaluated for adaptability in terms of viscosity reduction,swelling effect,foamy oil range,and residual heavy oil properties.The results show that CO_(2) huff-n-puff is best performed in vis-cosity reduction,swelling,and foamy oil range,but the injected CO_(2) has a significant impact on the residual heavy oil properties by increas-ing the residual heavy oil viscosity and decreasing the gas dissolution capacity,which is not conducive to multiple rounds of gas huff-n-puff.The natural gas huff-n-puff effect is slightly inferior to that of CO_(2) huff-n-puff,while the nitrogen huff-n-puff exhibits the worst performance but has a little impact on residual heavy oil properties.

关 键 词：吐哈探区 稠油油藏 注气吞吐 降黏效果 溶解膨胀作用 泡沫油 适应性评价 

分 类 号：TE345[石油与天然气工程—油气田开发工程]