基于CT扫描的致密砂岩渗流特征及应力敏感性研究

杨峰; 王昊; 黄波; 李晓倩; 张超; 肖春金; 李静

doi:10.12090/j.issn.1006-6616.2019.25.04.045

基于CT扫描的致密砂岩渗流特征及应力敏感性研究

doi: 10.12090/j.issn.1006-6616.2019.25.04.045

杨峰^1,,
王昊²,
黄波¹,
李晓倩¹,
张超¹,
肖春金¹,
李静^2, ,

1.
中国石化胜利油田分公司石油工程技术研究院, 山东东营 257200
2.
中国石油大学(华东)地质力学与工程研究所, 山东青岛 266580

基金项目:

国家科技重大专项 2016ZX05002-002

国家自然科学基金 41272141

详细信息

作者简介:
杨峰(1982-), 男, 硕士、高级工程师, 主要从事岩石力学与地球化学研究。E-mail:yangfengupc@163.com

通讯作者:
李静(1967-), 女, 博士、教授、博士生导师, 地质力学及油气储层预测。E-mail:lijing0681@163.com

中图分类号: TE319
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- 文章访问数: 401
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- 被引次数: 0
出版历程
- 收稿日期: 2018-09-14
- 修回日期: 2019-03-10
- 刊出日期: 2019-08-01

STUDY ON THE STRESS SENSITIVITY AND SEEPAGE CHARACTERISTICS OF TIGHT SANDSTONE BASED ON CT SCANNING

1.
Research Institute of Petroleum Engineering, Shengli Oil Field, SINOPEC, Dongying 257200, Shandong, China
2.
Research Institute of Geological Mechanics and Engineering, China University of Petroleum, Qingdao 266580, Shandong, China

摘要

摘要: 认识低渗透储层的渗流特征对油气开采和储层改造具有重要意义。为此，研究利用微CT扫描技术对致密砂岩岩样进行扫描，据此建立了能够精细刻画岩样的微观模型，运用COMSOL模拟了流体在岩石孔隙中的渗流特征，研究了致密砂岩的渗流特征及应力敏感性。研究结果表明：流体入口和出口间压差固定时，岩石的渗透率保持不变，与入口出口压力的具体数值无关；不同方向的岩石模型计算渗透率处在同一数量级但有微小差异；在侧向压力作用下，渗流路径变窄，通过渗流路径的整体速度下降，渗透率下降，但在孔隙相对较大的地方，由于路径变窄，流体速度较未加压力前略有上升。
- CT扫描 /
- 致密砂岩 /
- 微观渗流 /
- 数值模拟 /
- 应力敏感性
Abstract: The understanding of seepage characteristics of low-permeable reservoir is of great significant for oil and gas production and reservoir reconstruction. Therefore, the micro CT scanning technology was used to scan the tight sandstone samples so as to establish a microscopic model that can accurately reflect real structures of rock samples. COMSOL was used to simulate the seepage characteristics of fluid in the pores of rocks, and the seepage characteristics and stress sensitivity of tight sandstone were studied. The results show that:When the pressure difference between the inlet and outlet of the fluid is a constant value, the rock permeability remains unchanged and has no correlation with the specific value of the inlet and outlet pressure. The calculated permeability of rock models in different directions is in the same order of magnitude but slightly different. Under the action of lateral pressure, the flow path narrows, and the fluid overall velocity through the seepage path decreases, which leads to the decrease of permeability. However, where the pore is relatively large, the velocity rises slightly compared with that before the pressure is applied due to the narrowing of the path.
- CT scanning /
- tight sandstone /
- microscopic seepage /
- numerical simulation /
- stress sensitivity
注释:

责任编辑:范二平

HTML全文

图 1 岩石微观图像

Figure 1. Microimages of rocks

下载: 全尺寸图片幻灯片

图 2 XZ向模型速度

Figure 2. The velocity of the XZ model

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图 3 XZ向模型出口边界速度

Figure 3. Exit boundary velocity of the XZ model

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图 4 不同压差下的计算渗透率

Figure 4. The calculated permeabilities at different pressures

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图 5 50 MPa作用下XZ向模型应力图

Figure 5. The stress diagram of the XZ model under 50 MPa pressure

下载: 全尺寸图片幻灯片

图 6 不同侧向压力下的计算渗透率

Figure 6. The calculated permeabilities under different lateral pressures

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图 7 150°方向模型流速图像

Figure 7. The velocity images of the 150° direction model

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图 8 150°方向模型沿Y轴最大速度曲线

Figure 8. The maximum speed curves along the Y axis of the 150° direction model

下载: 全尺寸图片幻灯片

表 1 不同压力条件下XZ向模型的计算渗透率

Table 1. The calculated permeabilities of the XZ model under different pressures

入口压力/Pa	出口压力/Pa	压力差/Pa	出口处平均速度/(m/s)	计算渗透率/mD
100	0	100	4.63282×10^-8	0.474400343
200	100	100	4.63282×10^-8	0.474400343
300	200	100	4.63282×10^-8	0.474400343
100	0	100	4.63282×10^-8	0.474400343
1000	0	1000	4.63282×10^-7	0.474400343
1000000	0	1000000	4.61167×10^-4	0.472235032
5000000	0	5000000	2.29524×10^-3	0.47006424
10000000	0	10000000	4.56119×10^-3	0.467065696
15000000	0	15000000	6.79764×10^-3	0.464052534
20000000	0	20000000	9.01981×10^-3	0.461814133

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表 2 致密砂岩模型材料参数

Table 2. The material parameters of the tight sandstone model

	杨氏模量/GPa	泊松比	密度/(kg/m³)
基质区域	27	0.17	2500
孔隙区域	2.16	0	1000

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表 3 各方向上模型在不同侧向压力作用下的计算渗透率

Table 3. The calculated permeabilities of each side upward model under different lateral pressures

左边界压力/MPa	计算渗透率/mD
左边界压力/MPa	XZ向	30°	60°	90°	120°	150°	平均值
0	0.47440	0.36246	0.32044	0.40315	0.54939	0.30818	0.40229
10	0.47116	0.35908	0.31702	0.39926	0.54376	0.30558	0.39931
20	0.46690	0.35356	0.31433	0.39519	0.54117	0.30255	0.39562
30	0.46310	0.35052	0.31197	0.38923	0.53654	0.29966	0.39183
40	0.45930	0.34601	0.30895	0.38485	0.53255	0.29684	0.38808
50	0.45549	0.34206	0.30592	0.37891	0.52661	0.29506	0.38401

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