致密砾岩油藏超临界CO2吞吐开发可行性

doi:10.7657/XJPG20210409

摘要/Abstract

摘要：

CO₂吞吐开发具有溶解、抽提、混相等独特的机理优势,超临界CO₂具有更优异的注入性、穿透性和轻质组分抽提性。为进一步认识超临界CO₂吞吐在致密砾岩油藏开发中提高采收率的可行性,基于超临界CO₂—原油相互作用实验、超临界CO₂原油抽提实验、超临界CO₂吞吐物理模拟实验等手段,揭示吞吐过程中原油性质变化与增产机理,确定了不同注入参数下的采收率。结果显示：超临界CO₂能有效补充地层能量,降低原油黏度和密度,抽提原油轻质和中质组分,改善原油流动性;注入0.50 PV超临界CO₂可提高采收率22.16%,随着超临界CO₂注入量的增加,采收率上升,超临界CO₂换油率下降;4轮次吞吐相较于单次吞吐,可提高采收率20.00%~24.00%;焖井时间120 min时采收率为22.16%,焖井时间240 min后采收率变化不大;实验结果揭示了致密砾岩油藏衰竭式开发后超临界CO₂吞吐提高采收率的可行性,对致密砾岩油藏开发具有指导意义。

关键词: 致密砾岩油藏, 超临界CO₂吞吐, 原油流动性, 采收率, 可行性, 注入参数

Abstract:

CO₂ huff-puff development has unique mechanisms such as dissolution, extraction and miscibility and supercritical CO₂ has better injectivity, penetrability and extraction of light components. In order to further understand the feasibility of supercritical CO₂ huff-puff in enhancing oil recovery of tight conglomerate, based on supercritical CO₂ crude oil interaction, supercritical CO₂ crude oil extraction experiment and supercritical CO₂ huff-puff indoor physical simulation, oil property changes and stimulation mechanism during huff-puff process were revealed, and the recovery factors obtained with different injection parameters were determined. The results show that supercritical CO₂ can effectively supplement formation energy, reduce viscosity and density of crude oil, and improve mobility of crude oil. The recovery factor was improved by 22.16% after injecting 0.50 PV of supercritical CO₂; with the increase of supercritical CO₂ injection rate, the recovery factor increased but the replacement ratio decreased. Compared with the single round stimulation, the recovery efficiency of the four-round huff-puff can be increased by 20%~24%. The recovery factor was 22.16% after soaking for 120 minutes, but changed little after soaking for 240 minutes. The findings demonstrate that it is feasible to enhance the recovery by implementing supercritical CO₂ huff-puff development after depletion development in tight conglomerate reservoirs, which provides a reference to the development of tight conglomerate reservoirs.

Key words: tight conglomerate reservoir, supercritical CO₂ huff-puff, crude oil mobility, recovery factor, feasibility, injection parameter

中图分类号:

TE357

蒲万芬, 汪洋松, 李龙威, 高海铭, 单东柏, 王文科. 致密砾岩油藏超临界CO₂吞吐开发可行性[J]. 新疆石油地质, 2021, 42(4): 456-461.

PU Wanfen, WANG Yangsong, LI Longwei, GAO Haiming, SHAN Dongbai, WANG Wenke. Feasibility of Supercritical CO₂ Huff-Puff Development of Tight Conglomerate Reservoirs[J]. Xinjiang Petroleum Geology, 2021, 42(4): 456-461.

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致密砾岩油藏超临界CO₂吞吐开发可行性

Feasibility of Supercritical CO₂ Huff-Puff Development of Tight Conglomerate Reservoirs

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