低渗透油藏常规水驱与二氧化碳驱井距界限研究

于友; 魏建光; 张宝忠; 李江涛

doi:10.3969/j.issn.1006-6535.2021.02.018

特种油气藏 >

2021 , Vol. 28 >Issue 2: 120 - 125

DOI: https://doi.org/10.3969/j.issn.1006-6535.2021.02.018

油藏工程

低渗透油藏常规水驱与二氧化碳驱井距界限研究

于友 ,
魏建光 ,
张宝忠 ,
李江涛

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1.中国石油吉林油田分公司,吉林松原 138000;
2.陆相页岩油气成藏及高效开发教育部重点实验室,黑龙江大庆 163318;
3.东北石油大学,黑龙江大庆 163318;
4.中国石油大庆油田有限责任公司,黑龙江大庆 163514

于友(1970—),男,教授级高级工程师,1993年毕业于大庆石油学院地质学专业,2012年毕业于东北石油大学矿产普查与勘探专业,获博士学位,现主要从事油气田开发研究工作。

收稿日期: 2020-05-11

修回日期: 2020-11-16

网络出版日期: 2022-02-16

基金资助

国家自然科学基金“考虑污染条件下页岩气储层气水两相渗流机理研究”(51474070)

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Study on Well Spacing Limit for Conventional Water Flooding and Carbon Dioxide Flooding in Low-permeability Reservoirs

Yu You ,
Wei Jianguang ,
Zhang Baozhong ,
Li Jiangtao

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1. PetroChina Jilin Oil Field Company, Songyuan, Jilin 138000, China;
2. Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development (Northeast Petroleum University), Ministry of Education, Daqing, Heilongjiang 163318, China;
3. Northeast Petroleum University, Daqing, Heilongjiang 163318, China;
4. Petrochina Daqing Oilfield Co. Ltd. Daqing, Heilongjiang 163514, China

Received date: 2020-05-11

Revised date: 2020-11-16

Online published: 2022-02-16

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摘要

为实现吉林油田低渗透油藏井距优选设计,以吉林油田扶余油层为例,通过开展压力梯度测试实验,绘制了水驱和二氧化碳驱启动压力梯度与渗透率关系曲线,结合“一注一采”模式下储层压力分布规律,建立了水驱和二氧化碳驱的合理井距设计图版。结果表明:低渗透扶余油层的最小启动压力梯度与渗透率呈负幂指数关系,在注采压差为15~25 MPa条件下,同一岩心水驱的最小启动压力梯度为二氧化碳驱的2~4倍;储层渗透率低于0.10 mD时,二氧化碳驱的合理井距上限大于水驱,更具效益开发优势,渗透率为0.05~0.10 mD时对应的合理井距为120~380 m;储层渗透率大于0.10 mD时,水驱成本更低,更具开发优势,渗透率为0.10~0.20 mD时对应的合理井距为70~120 m。该研究成果对吉林油田扶余油层不同介质驱替下合理井距选择有借鉴意义。

关键词： 启动压力梯度; 低渗储层; 合理井距; 水驱; 二氧化碳驱; 扶余油层; 吉林油田

本文引用格式

于友 , 魏建光 , 张宝忠 , 李江涛 . 低渗透油藏常规水驱与二氧化碳驱井距界限研究[J]. 特种油气藏, 2021 , 28(2) : 120 -125 . DOI: 10.3969/j.issn.1006-6535.2021.02.018

Abstract

In order to realize the optimal design of well spacing for low-permeability reservoirs in Jilin Oilfield, based on a case study of Fuyu oil reservoir in Jilin Oilfield, pressure gradient test was conducted, a curve was prepared to indicate the relation between starting pressure gradient and permeability of water flooding and carbon dioxide flooding, and a reasonable well spacing design drawing was drawn for water flooding and carbon dioxide flooding with reference to reservoir pressure distribution law in a mode of "one for injection and one for production". the results of the study show that the minimum starting pressure gradient of the low-permeability Fuyu reservoir had a negative power exponential relation with the permeability, and the minimum starting pressure gradient of the same core water flooding was 2 to 4 times that of carbon dioxide flooding under the condition that the injection-production pressure difference was 15 to 25 MPa; when the reservoir permeability was lower than 0.10 mD, the upper limit of the reasonable well spacing for carbon dioxide flooding was greater than that of water flooding, which was more beneficial for development; when the permeability was from 0.05 to 0.10 mD, the associated reasonable well spacing range was from 120 to 380 m; when the reservoir permeability was greater than 0.10 mD, the water flooding cost was much lower and much favorable for development; when the permeability is from 0.10 to 0.20 mD, the reasonable well spacing range was from 70 to 120 m. The study results provide an important reference for the selection of reasonable well spacing with different medium flooding in Fuyu reservoir in Jilin Oilfield.

Key words： starting pressure gradient; low-permeability reservoir; reasonable well spacing; water flooding; carbon dioxide flooding; Fuyu oil peservoir; Jilin oilfield

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