不同粒径组合支撑剂在裂缝中运移规律模拟

Abstract

Abstract:

The study of proppant transport in fractures is of great significance for guiding fracturing design and evaluation. The current researches of proppant placement rules mainly focus on displacement, proppant type, fracturing fluid viscosity, etc. However, there are few studies on the effects of different proppant combinations on proppant transport rules. In this paper, the experimental schemes of the influence of different proppant combinations on proppant transport rules are designed. Then the self-designed visual parallel plate device is used to carry out these experiments. The results show that the distribution of the proppant with smaller particle size is more evenly in the fractures, but the proppant with larger particle size is easier to settle at the wellhead. When medium particle size and large particle size proppant are combined in different proportions, there are small differences in the equilibrium heights of the formed sand bank, but the differences between the non-uniformity of the sand bank height are large. Meanwhile, a large amount of proppant settles at the entrance end of the crack. The proppant filling amount in the deep crack is small, and the effective filling crack with sufficient length and diversion capacity is failure to be formed. When the medium and small particle sizes are combined in different proportions, the proppant can obtain a farther distance than that of the combination of medium particle size and large particle size. The height of the formed sandbank is ideal, and the difference in the non-uniformity of the height of the sand bank between different proportions is also greater.

Key words: hydraulic fracturing, proppant, transport rule, particle size combination, visual simulation

CLC Number:

TE357.12

Kuangsheng ZHANG,Tongwu ZHANG,Shunlin WU,Nianyin LI,Siyuan HE,Jun LI. Simulation of proppant transport in fracture with different combinations of particle size[J].Reservoir Evaluation and Development, 2019, 9(6): 72-77.

Figures/Tables 13

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References 21

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裂缝	裂缝高度/m	排量1/ （m³·min^-1）	排量2/ （m³·min^-1）	排量3/ （m³·min^-1）
压裂缝	50	4.00	6.00	8.00
实验模型	1	0.04	0.06	0.08

支撑剂粒径	裂缝中支撑剂分布剖面
70/140目
40/70目
20/40目

支撑剂比例（40/70目∶20/40目）	裂缝中支撑剂分布剖面
4∶1
2∶1
1∶1
1∶2
1∶4

支撑剂比例（40/70目：70/140目）	裂缝中支撑剂分布剖面
4∶1
2∶1
1:1
1∶2
1∶4

支撑剂组合	实验砂堤形态	数值模拟砂堤形态
40/70目
40/70目∶70/140目=4∶1
40/70目∶70/140目=1∶4

Simulation of proppant transport in fracture with different combinations of particle size

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