注入压力对CO2驱气窜影响规律及裂缝封堵研究

doi:10.11885/j.issn.1674-5086.2016.05.29.03

西南石油大学学报(自然科学版) ›› 2018, Vol. 40 ›› Issue (1): 149-156.DOI: 10.11885/j.issn.1674-5086.2016.05.29.03

注入压力对CO₂驱气窜影响规律及裂缝封堵研究

石立华, 党海龙, 康胜松, 王维波, 王强

陕西延长石油(集团)有限责任公司研究院, 陕西西安 710075

收稿日期:2016-05-29 出版日期:2018-02-01 发布日期:2018-02-01
通讯作者: 党海龙,E-mail:1405341793@qq.com
作者简介:石立华,1983年生,男,汉族,河南孟州人,工程师,硕士,主要从事油藏工程、油气田开发理论与方法方面研究工作。E-mail:slhhjn2008@163.com;党海龙,1970年生,男,汉族,陕西渭南人,高级工程师,主要从事油气田开发管理及研究工作。E-mail:1405341793@qq.com;康胜松,1982年生,男,汉族,吉林扶余人,工程师,硕士,主要从事石油地质研究工作。E-mail:99942487@qq.com;王维波,1982年生,男,汉族,陕西宝鸡人,工程师,硕士,主要从事油田提高采收率方面的研究工作。E-mail:215771136@qq.com;王强,1989年生,男,汉族,四川内江人,硕士,主要从事油气田开发地质方面的研究。E-mail:947890858@qq.com
基金资助:
国家科技重大专项（2011ZX05003-001）

Effects of Injection Pressure on Gas Channeling during CO₂ Flooding and a Study on Sealing of Cracks

SHI Lihua, DANG Hailong, KANG Shengsong, WANG Weibo, WANG Qiang

Research Institute of Shaanxi Yanchang Petroleum(Group) Co. Ltd., Xi'an, Shaanxi 710075, China

Received:2016-05-29 Online:2018-02-01 Published:2018-02-01

摘要/Abstract

摘要： 为了确定注气压力对CO₂驱油过程中气窜的影响规律，结合矿场实际情况，设计不同注气压力方案，测试不同注气压力下的窜逸时间，得出注气压力与CO₂窜逸速度、采出程度的变化规律。实验结果表明，注入速度、基质渗透率、裂缝大小及宽度是影响注入压力主要因素，合理的注入速度是控制注入压力的关键。注入速度越大，注入压力越大；裂缝越大，注入压力越低；基质渗透率越大，注入压力越小，在此基础上优选淀粉体系合理注入速度为0.2 mL/min。通过岩芯造缝模拟实验可知，气体的波及体积受储层裂缝影响严重，当级差大于1 000时，采出程度小于1%，优选了高强度凝胶体系为：淀粉4%+单体4%+交联剂0.05%+成胶控制剂0.18%，该凝胶体系强度高，成胶时间在8~20 h、性能稳定能够能够有效封堵住裂缝，封堵裂缝后采出程度可达19%，有效扩大了CO₂驱的波及体积。

关键词: 低渗透油藏, 注气压力, CO₂驱, 窜逸速度, 采出程度, 淀粉体系

Abstract: To determine the impact of injection pressure on gas channeling during CO₂ flooding processes, different injection pressure schemes were set up according to actual oil recovery conditions, through which the breakthrough times with different injection pressures were measured. From this experiment, we obtained the variation of CO₂ breakthrough velocities and recovery rates with injection pressure. The results indicated that injection rate, base substrate permeability, and the size and width of cracks are the most important factors for injection pressure, and the selection of an appropriate injection rate was the key for controlling injection pressure. It was found that the injection pressure increased in proportion with the injection rate, decreased with increases in the size of the cracks, and decreased with increases in base substrate permeability. These results showed that the optimal injection rate for starch systems was 0.2 mL/min. In crack simulation experiments using rock cores, the sweep volume of a gaseous body was significantly affected by cracks in the reservoir, as the recovery rate falls below 1% for differentials larger than 1 000. The composition of the optimal high-strength gel system was:4% starch + 4% monomer + 0.05% crosslinking agent + 0.18% antigumming agent. This gel system has high strength, a gelling time between 8 and 20 h, and stable performance; hence, it is capable of sealing cracks effectively. The recovery rate reached 19% after crack sealing was performed using this gel, thus demonstrating that this gel system effectively increased the sweep volume of CO₂ flooding.

Key words: low-permeability oil reserves, injection pressure, CO₂ flooding, breakthrough velocity, recovery rate, starch system

中图分类号:

TE348

石立华, 党海龙, 康胜松, 王维波, 王强. 注入压力对CO₂驱气窜影响规律及裂缝封堵研究[J]. 西南石油大学学报(自然科学版), 2018, 40(1): 149-156.

SHI Lihua, DANG Hailong, KANG Shengsong, WANG Weibo, WANG Qiang. Effects of Injection Pressure on Gas Channeling during CO₂ Flooding and a Study on Sealing of Cracks[J]. 西南石油大学学报(自然科学版), 2018, 40(1): 149-156.

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注入压力对CO₂驱气窜影响规律及裂缝封堵研究

Effects of Injection Pressure on Gas Channeling during CO₂ Flooding and a Study on Sealing of Cracks

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