Enhanced oil recovery and parameter optimization of hydrocarbon injection in fractured-cavity reservoirs

CHENG Xiaojun

doi:10.13809/j.cnki.cn32-1825/te.2022.06.009

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Enhanced oil recovery and parameter optimization of hydrocarbon injection in fractured-cavity reservoirs

更新时间：2025-12-05

- Enhanced oil recovery and parameter optimization of hydrocarbon injection in fractured-cavity reservoirs
- Petroleum Reservoir Evaluation and Development Vol. 12, Issue 6, Pages: 902-909(2022)
- 作者机构：
  
  1. 中国石化西北油田分公司，新疆乌鲁木齐 830011中国石化碳酸盐岩缝洞型油藏提高采收率重点实验室,新疆,乌鲁木齐,830011
  2. 中国石化碳酸盐岩缝洞型油藏提高采收率重点实验室,新疆,乌鲁木齐,830011
- 作者简介：
- 基金信息：
- DOI：10.13809/j.cnki.cn32-1825/te.2022.06.009
  CLC： TE357
- Published：2022
- 稿件说明：
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CHENG Xiaojun. Enhanced oil recovery and parameter optimization of hydrocarbon injection in fractured-cavity reservoirs[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(6): 902-909.
DOI：

CHENG Xiaojun. Enhanced oil recovery and parameter optimization of hydrocarbon injection in fractured-cavity reservoirs[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(6): 902-909. DOI： 10.13809/j.cnki.cn32-1825/te.2022.06.009.

摘要

缝洞型油藏储集空间多样、非均质性极强、油水性质差异大且水驱非混相氮气驱流度比大，水窜气窜严重、波及范围有限，一次采油和二次采油阶段原油采收率远低于碎屑砂岩油藏。以塔河油田S91缝洞单元为对象，在地质建模、历史拟合、剩余油表征和相态实验拟合基础上，开展缝洞型油藏注烃气提高采收率数值模拟研究，评价缝洞型油藏烃气混相条件，优化注烃气提高采收率参数。结果表明：S91单元注入烃气与地层原油最小混相压力为42.5 MPa，在目前地层压力下可以实现混相，混相机理为汽化气驱，随注入气重烃组分含量增加至21 %，最小混相压力为35.62 MPa，采收率增幅到最大值。注气方式为裂缝型储集体注气，溶洞型储集体采液，注气参数优选注气量168×10

、注气速度4×10

/d及注采比1∶0.9。

Abstract

Fractured-cavity reservoirs have diverse storage spaces

strong heterogeneity

large differences in oil-water properties

high mobility ratio of immiscible nitrogen flooding in water flooding

serious water and gas channeling

limited sweeping range

and primary and secondary oil recovery stages. Oil recovery is much lower than that of clastic sandstone reservoirs. Taking the S91 fracture-cavity unit in Tahe Oilfield as the object

on the basis of geological modeling

history matching

remaining oil characterization and phase state experimental fitting

a numerical simulation study on enhanced oil recovery by hydrocarbon injection in fractured-cavity reservoirs is carri

ed out

so as the evaluation of the hydrocarbon-gas miscibility conditions in fractured-cavity reservoirs

and the optimization of EOR parameters of hydrocarbon injection. The results show that the minimum miscibility pressure of injected hydrocarbon gas and formation crude oil in S91 unit is 42.5 MPa

which can be miscible under the current formation pressure. The mechanism of miscibility is vaporization gas flooding. As the content of heavy hydrocarbon components in the injected gas increases

the recovery factor increases. The gas injection method is gas injection in fractured reservoirs

and liquid recovery in caved reservoirs. The gas injection parameters are preferably 168×10

gas injection rate of 4×10

and injection-production ratio of 1∶0.9.

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Related Institution

College of Energy, Chengdu University of Technology

School of Geosciences, China University of Petroleum（East China）

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