自悬浮支撑剂清水携砂压裂增产机理研究

doi:10.13809/j.cnki.cn32-1825/te.2021.03.023

Abstract

Abstract:

At present, the research at home and abroad of self-suspension proppant, a new type of proppant, is mainly focus on indoor preparation and field application, but the study of its stimulation mechanism is less. In this paper, the solubility and swelling of self suspension proppant have been evaluated by the theoretical analysis of its suspension performance. Based on the physical simulation and numerical simulation, the dynamic flow mechanism of fluid mixed with sand has been studied, its flow conductivity has been evaluated and the influencing factors have been analyzed. The results show that the density of aggregate, multiple of swelling and viscosity of liquid after hydration are the main factors that affect the settling speed and the realization of self-suspension. Compared with the ordinary proppant, it has longer laying distance and more balanced longitudinal laying mode, and is beneficial to improve the conductivity of fracturing fractures. It has been applied in Qintong sag in Subei Basin twice. Compared with that of conventional guar gum fracturing, the daily production of single well can be increased by more than two times, which shows that the self suspension proppant in sand-carrying fracturing by water can effectively improve the productivity of the fractured wells.

Key words: stimulation mechanism, flow conductivity, physical simulation, numerical simulation, self-suspension proppant

CLC Number:

TE355

HUANG Bo,LEI Lin,TANG Wenjia,XU Ningwei,XIONG Wei. Stimulation mechanism of self suspension proppant in sand-carrying fracturing by water[J].Petroleum Reservoir Evaluation and Development, 2021, 11(3): 459-464.

Figures/Tables 14

Fig. 1

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Fig. 3

Table 1

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Table 2

Detail parameters of two simulation schemes"

支撑剂类型	$ρ l$ (kg/m³)	$ρ s$ (kg/m³)	$η$ ( mPa·s)	$d s$ (μm)	$α s$ (%)	$v I$ (m/s)	$v s$ (m/s)
自悬浮支撑剂	1 000	1 200	60	585	13.7	1	1
普通支撑剂	1 000	2 050	27	605	11.1	1	1

Table 2

Fig. 8

Fig. 9

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References 20

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支撑剂样品号	内核直径（mm）	水化层直径（mm）	水化层与内核直径比
a	0.79	0.98	1.241
b	0.89	1.54	1.571
c	0.99	1.46	1.475
d	1.17	1.60	1.368

Stimulation mechanism of self suspension proppant in sand-carrying fracturing by water

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