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| 非常规天然气储层超临界CO2压裂技术基础研究进展 |
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孙宝江1,2,王金堂1,2,孙文超3,王志远1,2,孙金声1,2
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(1.非常规油气开发教育部重点实验室(中国石油大学(华东)),山东青岛 266580;2.中国石油大学(华东)石油工程学院,山东青岛 266580;3.中国石油集团工程技术研究院有限公司,北京 102206)
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| 摘要: |
| 非常规天然气(致密气和页岩气)储层一般呈现低孔隙度、低渗透率、低孔喉半径等特征,气流阻力大,对于非常规天然气藏开发,主要采用压裂方式改造储层,提高单井产量和稳产有效期。水力压裂是实现商业开采的常用手段,但水力压裂针对非常规天然气储层存在水敏、储层污染等一系列问题。超临界二氧化碳(SC-CO2)无水压裂可以避免上述问题,是一种潜在的经济有效的压裂新方法,并具有减排优势。针对非常规天然气储层SC-CO2压裂技术进行跟踪调研,介绍非常规天然气储层压裂改造技术应用现状和非常规天然气储层SC-CO2压裂改造基础研究进展,分析SC-CO2压裂非常规天然气储层滤失特性、相态控制技术、SC-CO2压裂液增黏方法和SC-CO2压裂液携带支撑剂跟随性评价技术;提出SC-CO2压裂设备及工艺流程。开展结合现场工艺的SC-CO2压裂相态精确预测、研发不含氟、碳氢类聚合物的SC-CO2压裂液增黏剂体系、优选低密度支撑剂和进行SC-CO2压裂设备防腐、密封和流动保障技术攻关是非常规天然气储层SC-CO2压裂技术最重要的发展方向。 |
| 关键词: 非常规天然气 SC-CO2压裂 滤失规律 相态控制 增黏方法 水力参数 |
| DOI：10.3969/j.issn.1673-5005.2019.05.009 |
| 分类号::TE 357.1 |
| 文献标识码:A |
| 基金项目:国家自然科学基金重点项目(U1262202, U1762216);国家自然科学基金青年基金项目(41902324);中央高校基本科研业务费专项(19CX02012A) |
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| Advances in fundamental research of supercritical CO2 fracturing technology for unconventional natural gas reservoirs |
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SUN Baojiang1,2, WANG Jintang1,2, SUN Wenchao3, WANG Zhiyuan1,2, SUN Jinsheng1,2
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(1.Key Laboratory of Unconventional Oil ＆ Gas Development(China University of Petroleum(East China)), Ministry of Education, Qingdao 266580, China;2.School of Petroleum Engineering in China University of Petroleum (East China), Qingdao 266580, China;3.CNPC Engineering Technology R ＆ D Company Limited, Beijing 102206, China)
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| Abstract: |
| Unconventional natural gas (tight gas and shale gas) reservoirs are generally characterized with low porosity, low permeability, low pore-throat radii and high gas flow resistance. Therefore, fracturing-based reservoir stimulation has been applied for the exploitation of unconventional natural gas reservoirs so as to improve the production rate and extend the duration of stable production. Hydraulic fracturing has been widely used to achieve commercial hydrocarbon recovery, but it can be limited due to water sensitivity and formation damage in unconventional natural gas reservoirs. Therefore, supercritical carbon dioxide (SC-CO2) fracturing can be a potential economically efficient novel fracturing technology along with the advantages of carbon-reduction, and has evolved into a new research hotspot over the world in recent years. In this work, the state of the art of the SC-CO2 fracturing technology for unconventional gas reservoirs was reviewed, including the adsorption and desorption performance of SC-CO2 on reservoir rocks, the filtration characteristics of SC-CO2 in unconventional gas reservoirs, CO2 phase variation and control, the thickening and proppant carrying capability of the SC-CO2 fracturing fluid. The equipment used in SC-CO2 fracturing and its operation process were also described. It is important to formulate additives for thickening SC-CO2 fracturing fluid without fluorine and hydrocarbon polymers, and to select low-density proppants and develop SC-CO2 fracturing equipment with anti-corrosion, adequate sealing and flow support capabilities. |
| Key words: unconventional natural gas SC-CO2 fracturing filtration characteristics phase state control CO2 thickening method hydraulic fracturing parameters |
