前置液阶段的支撑剂段塞降低页岩储层压裂摩阻实验研究

doi:10.13809/j.cnki.cn32-1825/te.2020.01.012

Abstract

Abstract:

In order to solve the problem that the injection pressure of shale reservoir in Fuling area is too high in the early stage of hydraulic fracturing, researches on the resistance reduction based on proppant slug technology was carried out. By using the previous self-developed jet device and target, a set of physical simulation method for reducing fracture resistance in near well by grinding perforation with proppant slug was established and the orthogonal experiment was carried out. For the on-site needs, fore-tail pressure drop and average pressure drop rate are established to characterize the experimental results, and then analyzed accordingly. The results show that the influence of various factors on the resistance reduction effect from large to small is in the following orders: sand ratio, particle size, number of slugs（grinding time） and proppant type. The effect of reducing resistance of quartz sand is better than that of ceramsite. Drag reduction increases with the thickening of proppant particle size and the increase of sand ratio, and decreases at first and then increases with the prolongation of grinding time. Based on the results of orthogonal experiment, the optimal operating parameters of quartz sand with particle size of 40/70 mesh, sand ratio of 9 % and grinding time of 9 min are selected. On this condition, the optimal friction reduction effect of pressure drop rate of 0.439 MPa/min and head-tail pressure drop of 1.04 MPa are obtained. The experimental study provides a certain reference for the construction design of hydraulic fracturing of shale reservoir.

Key words: shale, perforation, friction reduction, tortuous fracture, proppant slug, hydraulic fracturing

CLC Number:

TE357

Zhaozhong YANG,Chenxuan GAO,Xiaogang LI, et al. Laboratory study on reducing fracturing friction of shale reservoir by proppant slug during pad[J]. Reservoir Evaluation and Development, 2020, 10(1): 77-83.

Figures/Tables 13

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References 17

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水平	因素
水平	支撑剂类型	粒径/目	砂比/%	打磨时间/min
1	石英砂	70/140	3	3
2	陶粒	80/120	6	6
3		40/70	9	9

组别	支撑剂类型	粒径/目	砂比/%	打磨时间/min
实验1	石英砂	70/140	3	3
实验2	石英砂	80/120	6	6
实验3	石英砂	40/70	9	9
实验4	陶粒	70/140	6	9
实验5	陶粒	80/120	9	3
实验6	陶粒	40/70	3	6
实验7	石英砂	70/140	9	6
实验8	石英砂	80/120	3	9
实验9	石英砂	40/70	6	3

组别	压降速率/（MPa·min^-1）	首尾压降/MPa
实验1	0	0
实验2	0.125	0.48
实验3	0.439	1.04
实验4	0.096	0.54
实验5	0.209	0.67
实验6	0.034	0.31
实验7	0.168	0.46
实验8	0.044	0.33
实验9	0.193	0.77

表征参数	压降速率/（MPa·min^-1）				首尾压降/MPa
表征参数	均值1	均值2	均值3	极差	均值1	均值2	均值3	极差
支撑剂	0.162	0.113		0.049	0.513	0.507		0.006
粒径	0.088	0.126	0.222	0.134	0.333	0.493	0.707	0.374
砂比	0.026	0.138	0.272	0.246	0.213	0.597	0.723	0.510
时间	0.134	0.109	0.193	0.084	0.480	0.417	0.637	0.220

Laboratory study on reducing fracturing friction of shale reservoir by proppant slug during pad

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