精控压裂薄差储层渗流特征实验研究

Abstract

Abstract:

Experiments for seepage flow patterns in thin and poor reservoirs could be carried out by the plate models made by artificial core designed based on the similarity theory. Pressure gradient distribution in fractured thin and poor reservoir by fine controlling was revealed based on the pressure data, and the sketch maps of seepage flow sections were drew to study on seepage flow patterns of fine controlled fractured thin and poor reservoir qualitatively and quantitatively. Experiment results showed that seepage flow patterns in thin and poor reservoirs were greatly influenced by permeability, heterogeneity and fine controlled fracturing cracks while the thin and poor reservoirs had low permeability and strong homogeneity. Fine controlled fracturing could reduce the negative influence of low permeability and strong heterogeneity. Thin and poor reservoirs could be divided into the non seepage flow section, the nonlinear seepage flow section and the quasi linear seepage flow section. The non seepage flow section was reduced by over 72 % after fine controlled fracturing, the area for fluid flowing through increased correspondingly, and the proportion of quasi linear percolation area which was more conducive to fluid flow raised by at least 86 %.

Key words: seepage flow pattern, pressure gradient, displacement experiments, fine controlled fracturing, thin and poor reservoir, plate model

CLC Number:

TE312

Qiannan Yu,Yikun Liu,Di Yao, et al. Experimental study on seepage flow patterns of fine controlled fractured thin and poor reservoirs[J]. Reservoir Evaluation and Development, 2019, 9(1): 15-22.

Figures/Tables 12

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References 18

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不同模型	模型边长/m	注采间距/m	厚度/ m	裂缝半径/m	注采压差/MPa	油黏度/ （mPa·s）	水黏度/ （mPa·s）	渗透率/10^-3μm²	孔隙度	油密度/ （ g·cm^-3）	水密度/ （ g·cm^-3）
平板模型实验	0.3	0.42	0.045	0.105	0.42	4.09	0.61	10 ~ 50	0.195	0.88	1
薄差储层典型	140	200	7.5	50	20	6.7	1.0	10 ~ 50	0.195	0.88	1

平板模型代号	不流动区		非线性流动区		拟线性流动区
平板模型代号	面积占比,%	变化幅度,%	面积占比,%	变化幅度,%	面积占比,%	变化幅度,%
（10~10）×10^-3μm²	15.749		50.707		33.544
（10~20）×10^-3μm²	14.612	-7.220	49.668	-2.049	35.721	6.487
（10~50）×10^-3μm²	14.361	-8.813	49.504	-2.372	36.135	7.724

平板模型代号	不流动区		非线性流动区		拟线性流动区
平板模型代号	面积占比,%	变化幅度,%	面积占比,%	变化幅度,%	面积占比,%	变化幅度,%
LF（10~10）×10^-3μm²	4.199		29.852		65.949
LF（10~20）×10^-3μm²	4.058	-3.358	29.425	-1.430	66.517	0.861
LF（10~50）×10^-3μm²	4.013	-4.430	28.405	-4.847	67.582	2.476

平板模型代号	不流动区		非线性流动区		拟线性流动区
平板模型代号	面积占比,%	变化幅度,%	面积占比,%	变化幅度,%	面积占比,%	变化幅度,%
（10~10）×10^-3μm²	15.749		50.707		33.544
LF（10~10）×10^-3μm²	4.199	-73.338	29.852	-41.128	65.949	96.604
（10~20）×10^-3μm²	14.612		49.667		35.721
LF（10~20）×10^-3μm²	4.058	-72.228	29.425	-40.755	66.517	86.213
（10~50）×10^-3μm²	14.361		49.504		36.135
LF（10~50）×10^-3μm²	4.013	-72.056	28.405	-42.621	67.582	87.026

注采非均质状况	精控压裂前		精控压裂后
注采非均质状况	面积比例,%	变化幅度,%	面积比例,%	变化幅度,%
（10~10）×10^-3μm²	15.749		4.199
（10~20）×10^-3μm²	14.612	-7.220	4.058	-3.358
（10~50）×10^-3μm²	14.361	-8.813	4.013	-4.430

Experimental study on seepage flow patterns of fine controlled fractured thin and poor reservoirs

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