志丹油区长7页岩油储层CO2吞吐室内实验

师调调; 杜燕; 党海龙; 朱童童; 刘双双; 石立华; 张佳琪

doi:10.3969/j.issn.1006-6535.2023.06.017

特种油气藏 >

2023 , Vol. 30 >Issue 6: 128 - 134

DOI: https://doi.org/10.3969/j.issn.1006-6535.2023.06.017

油藏工程

志丹油区长7页岩油储层CO₂吞吐室内实验

师调调 ,
杜燕 ,
党海龙 ,
朱童童 ,
刘双双 ,
石立华 ,
张佳琪

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陕西延长石油(集团)有限责任公司,陕西西安 710065

师调调(1984—),女,高级工程师,2007年毕业于吉林大学地质学专业,2012年毕业于西北大学油气田地质与开发专业,获博士学位,现从事页岩油微观孔隙结构及提高采收率技术研究工作。

收稿日期: 2023-03-29

修回日期: 2023-09-25

网络出版日期: 2024-01-19

基金资助

陕西省自然科学基础研究计划“页岩油储层微-纳米孔喉系统量化表征及对可动流体赋存状态控制机理研究”(2022JQ-290)、“致密砂岩储层微观孔喉结构及薄膜流动对渗吸规律的影响”(2023-JC-YB-423)

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Indoor Experiment on CO₂ Huff-n-Puff in Chang7 Shale Oil Reservoir in Zhidan Oil Region

Shi Tiaotiao ,
Du Yan ,
Dang Hailong ,
Zhu Tongtong ,
Liu Shuangshuang ,
Shi Lihua ,
Zhang Jiaqi

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Shaanxi Yanchang Petroleum (Group) Co., Ltd, Xi'an, Shaanxi 710065, China

Received date: 2023-03-29

Revised date: 2023-09-25

Online published: 2024-01-19

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摘要

为了评价页岩油储层CO₂吞吐驱油效果及不同尺度孔喉下原油可动性,选取延长油田志丹油区长7储层天然岩心,基于高温高压长岩心CO₂吞吐实验和短岩心剩余油在线核磁共振实验,在评价驱油效果的基础上,分析不同测压点CO₂混相状态及驱替规律,对比纳米、微米级孔喉尺度下混相吞吐与非混相吞吐效果,评价页岩油储层不同尺度空间原油可动性。研究表明:CO₂非混相吞吐波及效果较差,岩心内部压力增加不明显,压力波及范围小;CO₂混相吞吐波及范围广,压力梯度大,单位时间产油量高,驱油效果明显好于CO₂非混相吞吐,在注入相同孔隙体积倍数条件下,采收率较CO₂非混相吞吐提高8.24个百分点;CO₂混相吞吐前2周期生产压差大,混相吞吐区间距离长,混相驱特征明显;在整个岩样孔喉中,微米级孔隙占比低,纳米级、亚微米级孔隙是原油主要贡献者。该研究成果可为页岩储层补充地层能量、提高采收率提供重要参考。

关键词： 可动性评价; 长岩心; 在线核磁共振; CO₂吞吐; 志丹油区

本文引用格式

师调调 , 杜燕 , 党海龙 , 朱童童 , 刘双双 , 石立华 , 张佳琪 . 志丹油区长7页岩油储层CO₂吞吐室内实验[J]. 特种油气藏, 2023 , 30(6) : 128 -134 . DOI: 10.3969/j.issn.1006-6535.2023.06.017

Abstract

In order to evaluate the oil displacement effect of CO₂ huff-n-puff of shale oil reservoirs and the mobility of crude oil under different scales of pore throats, a natural core of Chang7 reservoir in Zhidan Oil Region of Yanchang Oilfield was selected, based on high temperature and high pressure CO₂ huff-n-puff in long cores and residual oil in short cores online NMR test experiments, and on the basis of evaluating the oil displacement effect, the mixed-phase state of CO₂ and the displacement law at different pressure measurement points were analyzed, the effect of mixed-phase huff-n-puff was compared with that of non-mixed-phase huff-n-puff at nano- and micron-scale pore throats, and the mobility of crude oil in different scale spaces of shale oil reservoirs was evaluated. The study shows that the effect of CO₂non-mixed-phase huff-n-puff was poor, the pressure inside the core increase was not obvious, and the pressure affecting range is small; under the condition of injecting the same pore volume multiplier, the recovery efficiency was increased by 8.24 percentage points compared with CO₂ non-mixed-phase huff-n-puff; the production pressure difference in the first 2 cycles of CO₂ mixed-phase huff-n-puff was large, the distance between CO₂ mixed-phase huff-n-puff intervals was long, and the characteristics of CO₂ mixed-phase displacement were obvious; in the whole pore throat of the rock sample, the proportion of micron-level pores was low, and nano-and submicron-level pores were the the main contributor of the crude oil. The study results can provide an important reference for shale reservoirs to replenish formation energy and improve recovery efficiency.

Key words： mobility evaluation; long core; online NMR; CO₂ huff-n-puff; Zhidan Oil Region

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