断溶体油藏填充物对裂缝闭合影响试验研究

孔强夫; 尚根华; 刘坤岩; 李小波

doi:10.19509/j.cnki.dzkq.2021.0607

断溶体油藏填充物对裂缝闭合影响试验研究

doi: 10.19509/j.cnki.dzkq.2021.0607

基金项目:

国家示范工程项目 P19026-3

中石化研究院基础前瞻项目 JC-2020-KT002-6

详细信息

作者简介:
孔强夫(1989-), 男, 工程师, 主要从事测井与储层地质方面的研究工作。E-mail: kongqf.syky@sinopec.com.cn

中图分类号: TE12
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- 文章访问数: 859
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- 被引次数: 0
出版历程
- 收稿日期: 2021-01-18

Experimental study on the effect of fillers on fracture closure in fault-karst reservoir

摘要

摘要: 裂缝是断溶体油藏的重要渗流通道，随着地层流体的采出，裂缝将发生闭合，其在地应力作用下的闭合规律对于储层渗透率具有重要影响。采集碳酸盐岩岩样，通过巴西劈裂实验制备裂缝试件，构建基于CT扫描灰度图像的裂缝变形分析方法，通过加压和卸压试验，研究裂缝在被不同填充物填充条件下的闭合规律，裂缝的闭合情况采用岩心渗透率和裂缝开度综合表征，以此研究裂缝填充物性质对裂缝闭合规律的影响。研究结果表明：随着围压的增大，裂缝开度和试件渗透率均逐渐降低；填充物延展性越强，裂缝在压力作用下闭合越明显，渗透率降低幅度越大；对于同样被石英填充的裂缝，不同的填充方式下裂缝闭合规律不同，对于裂缝的支撑效果，单层细砂>厚层细砂>中砂细砂混合（结果）。研究成果可为认识不同矿物填充裂缝在地应力作用下的闭合规律提供参考。
- 塔河油田 /
- 断溶体油藏 /
- 裂缝闭合规律 /
- CT扫描 /
- 数字岩心
Abstract: Fracture is an important percolation channel in fault solution reservoir, and its closure law under geostress has an important influence on reservoir permeability.The physical simulation experiments of carbonate rock samples were carried out to study the influence of fracture occurrence (vertical fracture and high angle fracture) and filling on the law of fracture closure.The fracture specimen is prepared by Brazilian splitting experiment and wire cutting method, and the fracture deformation analysis method based on CT scanning gray image is constructed.The fracture closure is characterized by core permeability and fracture width.The results show that the fracture width and specimen permeability decrease gradually with the increase of pressure; the stronger the ductility of the filler is, the more obvious the fracture closure under pressure is, and the greater the decrease of permeability is; for quartz-filled cracks, the fracture permeability is different under different filling methods, and the supporting effect on the fracture is as follows: single layer fine sand > thick layer fine sand > medium sand and fine sand mixed.
- Tahe Oilfield /
- fault-karst reservoir /
- fracture closure law /
- CT scanning /
- digital core

HTML全文

图 1 夹持器结构图

(单位: mm)

Figure 1. Structure diagram of core holder

(unit: mm)

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图 2 夹持器实物图

Figure 2. Photograph of core holder

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图 3 X射线CT扫描仪

Figure 3. Photograph of X-ray CT scanner

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图 4 碳酸盐岩裂缝试件

Figure 4. Carbonate specimen with fracture

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图 5 基于三维图像的局部厚度计算方法

Figure 5. Calculation method of fracture thickness based on 3D image

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图 6 升压过程中三维扫描图像

Figure 6. 3D scan image during pressure increasing

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图 7 升压过程中渗透率与缝宽变化

Figure 7. Change of fracture permeability and width during pressure increasing

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图 8 加压前后样品填充物照片

Figure 8. Photograph of sample with fillings before and after pressing

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图 9 锡丝和铜片填充样品渗透率与压力关系

Figure 9. Relationship between permeability and pressure of tin wire and copper sheet filled samples

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图 10 石英填充加压后裂缝样品照片

Figure 10. Photograph of samples filled with quartz sand after pressing

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图 11 不同石英砂填充方式渗透率与压力关系

Figure 11. Relationship between permeability and pressure with different quartz sand filling methods

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表 1 垂直缝压力与渗透率关系

Table 1. Relationship between vertical fracture pressure and permeability

填充方式	无填充	锡丝	铜片	细中砂混
公式	P_c=52.021×e^(-0.016×k)	P_c=7 817.4×k^(-1.195)	P_c=553 315×k^(-2.128)	P_c=47.753×k^(-0.397)
K_100%/×10^-3 μm²	189.99	940.71	343.44	194.02
K_70%/×10^-3 μm²	133.00	658.50	240.41	135.81
K_50%/×10^-3 μm²	95.00	470.35	171.72	97.01
K_30%/×10^-3 μm²	7.00	282.21	103.03	58.21
P_70%/MPa	6.19	3.35	4.75	6.80
P_50%/MPa	11.38	5.01	9.71	7.77
P_30%/MPa	20.90	9.22	28.80	9.51

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