Application and Cognition of Multi-Cluster Fracturing Technology in Horizontal Wells in Shale Reservoirs

doi:10.7657/XJPG20200417

Abstract

Abstract:

Multi-cluster fracturing technology in horizontal well is one of key technologies to stimulate shale reservoirs efficiently, which can increase hydraulic fracture complexity and enhance pay-gross ratio among clusters. In this paper, the application status of multi-cluster fracturing technology in the shale reservoirs in North America and southern Sichuan basin is stated and some opinions are presented by combing with its mechanism. Multi-cluster fracturing technology should match with well spacing, diversion technology and limited-entry perforation technology should be used to improve cluster efficiency and promote fracture propagation evenly so as to increase multi-cluster fracturing effectiveness. Multi-cluster fracturing has been extensively applied in the shale areas in North America to enhance production and realize efficient development, but the technology in the shale area in the southern Sichuan basin started relatively late and at present field tests of the hydraulic fracturing technology with 6-8 clusters in horizontal sections have been conducted in horizontal wells with the well spacing of 300-400 m. In order to reduce cost and improve operation efficiency, long horizontal section multi-cluster fracturing is considered as a promising trend for efficient development. However, with the increase of cluster number, the matching of perforation technology, diversion technology, cluster number with operation parameters is facing challenges, and a multi-cluster fracturing technology suitable for different geological and engineering characteristics of the target areas needs to be further studied.

Key words: shale reservoir, horizontal well, multi-cluster fracturing technology, well spacing, cluster number, cluster spacing, fracturing operation parameter, matching technology

CLC Number:

TE357

ZHAO Zhiheng, ZHENG Youcheng, FAN Yu, SONG Yi, GUO Xingwu. Application and Cognition of Multi-Cluster Fracturing Technology in Horizontal Wells in Shale Reservoirs[J]. Xinjiang Petroleum Geology, 2020, 41(4): 499-504.

Figures/Tables 3

References 35

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页岩气区块	埋深/m	总有机碳含量/%	孔隙度/%	脆性矿物含量/%	压力系数	水平应力差/MPa	地层温度/℃
川南页岩气区块	2 000~4 500	2.5~4.8	3.4~7.9	50~80	1.2~2.1	9~20	70~145
Haynesville 页岩气区块	3 000~4 700	2.0~7.0	5.0~11.0	65~75	1.6~2.1	3~6	149~177
Eagle Ford 页岩气区块	1 300~3 600	2.0~6.5	3.4~14.6	67~87	1.3~2.0		68~168
Duvernay 页岩气区块	3 000~4 200	2.0~6.0	3.0~6.0	>40	1.8~2.1		>100