Progress and development trend of water huff-n-puff technology for horizontal wells in tight oil reservoirs in China

doi:10.7623/syxb202301012

Acta Petrolei Sinica ›› 2023, Vol. 44 ›› Issue (1): 188-206.DOI: 10.7623/syxb202301012

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Progress and development trend of water huff-n-puff technology for horizontal wells in tight oil reservoirs in China

Pu Chunsheng¹, Kang Shaofei¹, Pu Jingyang¹, Gu Xiaoyu², Gao Zhendong³, Wang Yongdong³, Wang Kai¹

1. School of Petroleum Engineering, China University of Petroleum, Shandong Qingdao 266555, China;
2. College of Petroleum Engineering, Xi'an Shiyou University, Shaanxi Xi'an 710065, China;
3. Yanchang Oil Field Company Limited, Shaanxi Yan'an 716000, China

Received:2021-08-22 Revised:2022-07-26 Online:2023-01-25 Published:2023-02-14

中国致密油藏水平井注水吞吐技术进展与发展趋势

蒲春生¹, 康少飞¹, 蒲景阳¹, 谷潇雨², 高振东³, 王永东³, 王凯¹

1. 中国石油大学(华东)石油工程学院山东青岛 266555;
2. 西安石油大学石油工程学院陕西西安 710065;
3. 延长油田股份有限公司陕西延安 716000

通讯作者: 蒲春生,男,1959年3月生,1992年获西南石油学院博士学位,现为中国石油大学(华东)教授、博士生导师,主要从事低渗、特低渗、稠油、超稠油等特种油气藏物理-化学强化开采及资源环境保护理论与技术方面的研究工作。
作者简介:蒲春生,男,1959年3月生,1992年获西南石油学院博士学位,现为中国石油大学(华东)教授、博士生导师,主要从事低渗、特低渗、稠油、超稠油等特种油气藏物理-化学强化开采及资源环境保护理论与技术方面的研究工作。Email:chshpu_tx@163.com
基金资助:
国家自然科学基金项目（No.52104057）和山东省自然科学基金项目（ZR2021QE106）资助。第一作者及

Abstract

Abstract: Tight reservoirs are mostly developed by volumetric fracturing horizontal wells with the elastic drive of natural energy in China. As the production of horizontal well decreases rapidly, the primary oil recovery is less than 10%. To effectively supplement the formation energy is the key for stable production of the volumetric fracturing horizontal wells in tight reservoirs. Water huff-n-puff is an effective method for the supplementation of formation energy in tight reservoir for horizontal wells. In recent years, a lot of researches and practice have been performed on this method. This paper introduces the process of water huff-n-puff technology, outlines the research progress on the mechanism of water huff-n-puff from two aspects:micro-mechanism of imbibition oil recovery and influence law of pressure on imbibition oil recovery, and further systematically summarizes the influence law of reservoir properties and process parameters on the oil recovery of water huff-n-puff technology. To improve the oil recovery of water huff-n- puff, there are mainly three technologies, including the water huff-n-puff technology assisted by chemical treatment agent and enhanced by large displacement water injection, and inter-fracture asynchronous injection-production technology in the same horizontal wells. Through summarizing the research results from reservoir numerical simulation and process parameter optimization for water huff-n-puff, and analyzing field practise experience, this paper further proposes the future development trends of water huff-n-puff technology in tight reservoirs.

Key words: tight reservoir, supplementation of formation energy, water huff-n-puff, technical progress, development trends

摘要： 中国致密油藏多采用水平井体积压裂衰竭式开发，水平井产量递减快，一次采收率不足10%。因此，有效补充地层能量是致密油藏体积压裂水平井稳产的关键。注水吞吐是致密油藏水平井的一种有效注水补充能量方法，近年来针对该方法进行了大量的研究和实践。在介绍注水吞吐工艺的基础上，从渗吸采油微观机理以及压力对渗吸排油影响两个方面对注水吞吐机理的研究进展进行了概述，并系统总结了储层性质和工艺参数对注水吞吐采油效果的影响。为了提高注水吞吐的开发效果，目前主要形成了化学处理剂辅助注水吞吐技术、大排量注水强化注水吞吐技术和水平井同井缝间异步注采技术3种改善注水吞吐开发效果的技术。进一步通过总结注水吞吐油藏数值模拟和工艺参数优化的研究成果，分析矿场实践经验，提出了中国致密油藏注水吞吐技术未来发展趋势。

关键词: 致密油藏, 补充能量, 注水吞吐, 技术进展, 发展趋势

CLC Number:

TE357

Pu Chunsheng, Kang Shaofei, Pu Jingyang, Gu Xiaoyu, Gao Zhendong, Wang Yongdong, Wang Kai. Progress and development trend of water huff-n-puff technology for horizontal wells in tight oil reservoirs in China[J]. Acta Petrolei Sinica, 2023, 44(1): 188-206.

蒲春生, 康少飞, 蒲景阳, 谷潇雨, 高振东, 王永东, 王凯. 中国致密油藏水平井注水吞吐技术进展与发展趋势[J]. 石油学报, 2023, 44(1): 188-206.

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Progress and development trend of water huff-n-puff technology for horizontal wells in tight oil reservoirs in China

中国致密油藏水平井注水吞吐技术进展与发展趋势

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