彩9井区西山窑组特高含水油藏CO2混相驱先导试验

doi:10.3969/j.issn.1006-6535.2021.06.016

特种油气藏 ›› 2021, Vol. 28 ›› Issue (6): 121-128.DOI: 10.3969/j.issn.1006-6535.2021.06.016

彩9井区西山窑组特高含水油藏CO₂混相驱先导试验

张艳梅¹, 万文胜¹, 李琛¹, 罗鸿成¹, 刘衍彤², 张会利¹, 张瑞雪¹

1.中国石油新疆油田分公司,新疆阜康 831511;
2.新疆新易通石油科技有限公司,新疆克拉玛依 834000

收稿日期:2020-11-17 修回日期:2021-09-22 出版日期:2021-12-25 发布日期:2022-02-16
通讯作者: 刘衍彤(1966—),女,高级工程师,1988年毕业于西南石油学院油藏工程专业,1998年毕业于该校油气藏工程专业,获硕士学位,现主要从事油气田开发、提高油藏采收率技术服务等工作。
作者简介:张艳梅(1973—),女,工程师,1994年毕业于重庆石油学校石油及天然气开采专业,2007年毕业于西安石油大学工商管理专业,获学士学位,现主要从事提高油藏采收率研究、油田老区开发方案编制等工作。
基金资助:
国家科技重大专项 “新疆低渗透砾岩油藏CO₂驱油与埋存先导试验”(2016ZX05056)

Pilot Test of CO₂ Miscible Displacement for Extra High Water Cut Reservoir in Xishanyao Formation of Block Cai 9

Zhang Yanmei¹, Wan Wensheng¹, Li Chen¹, Luo Hongcheng¹, Liu Yantong², Zhang Huili¹, Zhang Ruixue¹

1. PetroChina Xinjiang Oilfield Company, Fukang, Xinjiang 831511, China;
2. Xinjiang Xinyitong Petroleum Technology Co., Ltd., Karamay, Xinjiang 834000, China

Received:2020-11-17 Revised:2021-09-22 Online:2021-12-25 Published:2022-02-16

摘要/Abstract

摘要： 目前彩南油田彩9井区西山窑组已进入高含水低产低能阶段,开井率仅为23.0%,即将面临废弃停产。为了提高该井区特高含水油藏产能,降低含水率,利用类比法、油藏工程及数值模拟方法,对彩9井区西山窑组油藏开展CO₂混相驱可行性论证及油藏工程设计,并进行先导试验。结果表明:先导试验区应选择小井距反七点井网的C2576井组,注入层位选择剩余油富集的J₂x₁^2-2小层,合理注入量为0.3倍孔隙体积(地面CO₂注入量为10 500 t),注气速度为30～40 t/d,注采比为1.1~1.2。现场试验证实,该井组累计注入4 529.7 t CO₂后,累计增油达到1 269 t,CO₂换油率达到0.27 t/t,取得了较好的增产效果。该研究可为彩南油田CO₂混相驱扩大试验和全面调整开发提供技术支撑。

关键词: CO₂混相驱, 特高含水油藏, 油藏工程, 提高采收率, 彩南油田

Abstract: At present, the oil reservoir in Xishanyao Formation in Well Block Cai 9, Cainan Oilfield is high in water cut and low in production, with a well development rate of only 23.0%, and it will be abandoned and shut down. In order to improve the productivity and reduce the water cut of the ultra-high water-cut reservoir in this well block, analogy method, reservoir engineering and numerical simulation method were employed to analyze the feasibility of CO₂ miscible displacement, develop reservoir engineering design, and perform pilot test. The results showed that Well Block C2576 in inverted seven-spot pattern with small spacing was selected as the pilot test area, Sublayer J₂x₁^2-2 rich in remaining oil was selected as the injection layer, the reasonable injection rate was 0.3 times the pore volume (the CO₂ injection rate on ground was 10 500 t ), the gas injection velocity was 30-40 t/d, and the injection-production ratio was 1.1-1.2. The field test proved that after 4 529.7 t CO₂ injected cumulatively into this well block, the cumulative oil increase reached 1 269 t, and the oil displacement efficiency was 0.27 t/t after CO₂ injection, achieving a good stimulation effect. This research provides technical support for the pilot test, overall adjustment and development of CO₂ miscible displacement in Cainan Oilfield.

Key words: CO₂ miscible flooding, ultra-high water-cut reservoirs, reservoir engineering, enhanced oil recovery, Cainan Oilfield

中图分类号:

TE357.7

张艳梅, 万文胜, 李琛, 罗鸿成, 刘衍彤, 张会利, 张瑞雪. 彩9井区西山窑组特高含水油藏CO₂混相驱先导试验[J]. 特种油气藏, 2021, 28(6): 121-128.

Zhang Yanmei, Wan Wensheng, Li Chen, Luo Hongcheng, Liu Yantong, Zhang Huili, Zhang Ruixue. Pilot Test of CO₂ Miscible Displacement for Extra High Water Cut Reservoir in Xishanyao Formation of Block Cai 9[J]. Special Oil & Gas Reservoirs, 2021, 28(6): 121-128.

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彩9井区西山窑组特高含水油藏CO₂混相驱先导试验

Pilot Test of CO₂ Miscible Displacement for Extra High Water Cut Reservoir in Xishanyao Formation of Block Cai 9

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