煤层压裂缝内支撑剂输送物理模拟研究

doi:10.13809/j.cnki.cn32-1825/te.2020.04.006

Abstract

Abstract:

In order to explore the influence of proppant settlement on the laying form of sand in coal seam cracks, the physical simulation is used to study the rules of proppant settlement and migration based on the previous researches. The visual physical simulation device of proppant transportation can directly and conveniently simulate the proppant placement in the fractures. Fully considering the in-site fracturing construction and the similarity of Reynolds number, the experiment for the influence of single factor change on the sand laying form of proppant is designed. The equilibrium height and time are used as the characterization parameters. In the early stage, the proppant settlement and migration rules of different pump injection displacement, sand ratio and proppant particle sizes are quantitatively analyzed by single crack. In the later stage, a branch crack is added to analyze the rules of proppant settlement and migration in the main crack and branch crack under the condition of different particle sizes of proppant. The results show that the smaller the pump displacement is, the higher the equilibrium height of sand dike will be if the sand ratio and particle size are larger and larger, and the longer the equilibrium time will be if the sand ratio and particle size are smaller and smaller; the distribution rule of branch crack is similar to that of main crack, the equilibrium height is lower than that of main fracture, and the equilibrium time is longer.

Key words: coal seam, cracks, proppant, law of settlement and migration, physical simulation

CLC Number:

TE371

LI Xiaogang,SHU Dongkun,ZHANG Ping,YANG Zhaozhong. Physical simulation of proppant transportation in artificial fractures of coal seam[J].Reservoir Evaluation and Development, 2020, 10(4): 39-44.

Figures/Tables 15

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References 26

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实验号	泵注排量/ （m³·min^-1）	实际施工排量（单翼）/（m³·min^-1）	砂比/ %	支撑剂类型	粒径/ 目	分支缝
1	0.08	4.2	7	石英砂	20/40	无
2	0.10	5.2	7	石英砂	20/40	无
3	0.10	5.2	4	石英砂	20/40	无
4	0.10	5.2	10	石英砂	20/40	无
5	0.10	5.2	7	石英砂	30/50	无
6	0.10	5.2	7	石英砂	40/70	无
7	0.12	6.3	7	石英砂	20/40	无
8	0.10	5.2	7	石英砂	20/40	有
9	0.10	5.2	7	石英砂	30/50	有
10	0.10	5.2	7	石英砂	40/70	有

实验号	排量/ （m³·min^-1）	砂比/ %	支撑剂类型	粒径/目	分支缝	平衡时刻/s	平衡高度/cm
1	0.08	7	石英砂	20/40	无	77	32
2	0.10	7	石英砂	20/40	无	57	29
3	0.10	4	石英砂	20/40	无	62	27
4	0.10	10	石英砂	20/40	无	51	31
5	0.10	7	石英砂	30/50	无	86	26
6	0.10	7	石英砂	40/70	无	183	22
7	0.12	7	石英砂	20/40	无	51	27

实验号	排量/ （m³·min^-1）	砂比 /%	支撑剂类型	粒径 /目	分支缝	主缝平衡时刻/s	主缝平衡高度/cm	分支缝平衡时刻/s	分支缝平衡高度/cm
8	0.10	7	石英砂	20/40	有	70	38	77	34
9	0.10	7	石英砂	30/50	有	79	36	85	31
10	0.10	7	石英砂	40/70	有	108	33	215	29

实验号	排量/ （m³·min^-1）	砂比/ %	支撑剂类型	粒径/目	分支缝	平衡时刻/ s	平衡高度/cm
1	0.08	7	石英砂	20/40	无	77	32
2	0.10	7	石英砂	20/40	无	57	29
7	0.12	7	石英砂	20/40	无	51	27

实验号	排量/ （m³·min^-1）	砂比/ %	支撑剂类型	粒径/ 目	分支缝	平衡时刻/ s	平衡高度/cm
3	0.1	4	石英砂	20/40	无	62	27
2	0.1	7	石英砂	20/40	无	57	29
4	0.1	10	石英砂	20/40	无	51	31

Physical simulation of proppant transportation in artificial fractures of coal seam

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