High-pressure capacity expansion and water injection mechanism and indicator curve model for fractured-vuggy carbonate reservoirs
作者机构：China Univ Petr Inst Unconvent Oil & Gas Sci & Technol Beijing 102249 Peoples R China Southwest Petr Univ State Key Lab Reservoir Geol & Dev Chengdu 610500 Peoples R China Tarim Oil field Co PetroChina Korla 841000 Peoples R China
出 版 物：《PETROLEUM》 (油气（英文）)
年 卷 期：2024年第10卷第3期
页 面：511-519页
核心收录：
学科分类：0820[工学-石油与天然气工程] 0202[经济学-应用经济学] 02[经济学] 020205[经济学-产业经济学] 0817[工学-化学工程与技术]
基 金：China Postdoctoral Science Foundation [M2019650965] Major R & D Plan of Sichuan Province [2020YFQ0034] National Natural Science Fund Projects
主 题：Fractured-vuggy carbonate reservoirs High-pressure capacity expansion and water injection Mechanism Water injection indicator curve ENHANCED OIL-RECOVERY STRESS SENSITIVITY TARIM BASIN FIELD
摘 要：Water injection for oil displacement is one of the most effective ways to develop fractured-vuggy carbonate reservoirs. With the increase in the number of rounds of water injection, the development effect gradually fails. The emergence of high-pressure capacity expansion and water injection technology allows increased production from old wells. Although high-pressure capacity expansion and water injection technology has been implemented in practice for nearly 10 years in fractured-vuggy reservoirs, its mechanism remains unclear, and the water injection curve is not apparent. In the past, evaluating its effect could only be done by measuring the injection-production volume. In this study, we analyze the mechanism of high-pressure capacity expansion and water injection. We propose a fluid exchange index for high-pressure capacity expansion and water injection and establish a discrete model suitable for high-pressure capacity expansion and water injection curves in fractured-vuggy reservoirs. We propose the following mechanisms: replenishing energy, increasing energy, replacing energy, and releasing energy. The above mechanisms can be identified by the high-pressure capacity expansion and water injection curve of the well HA6X in the Halahatang Oilfield in the Tarim Basin. By solving the basic model, the relative errors of Reservoirs I and II are found to be 1.9% and 1.5%, respectively, and the application of field examples demonstrates that our proposed high-pressure capacity expansion and water injection indicator curve is reasonable and reliable. This research can provide theoretical support for high-pressure capacity expansion and water injection technology in fracture-vuggy carbonate reservoirs.
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