Fracture propagation and channeling of zipper fracturing in deep shale gas wells

WANG Qiang; WANG Yufeng; HU Yongquan; ZHAO Jinzhou; SONG Yi; SHEN Cheng

doi:10.11698/PED.20240603

Petroleum Exploration and Development >

0 20241001 - 20241001

DOI: https://doi.org/10.11698/PED.20240603

Fracture propagation and channeling of zipper fracturing in deep shale gas wells

WANG Qiang ,
WANG Yufeng ,
HU Yongquan ,
ZHAO Jinzhou ,
SONG Yi ,
SHEN Cheng

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1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
2. Shale Gas Research Institute, PetroChina Southwest Oil & Gas Field Company, Chengdu 610500, China

Received date: 2024-01-30

Revised date: 2024-08-05

Online published: 2024-08-15

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Abstract

The fracture propagation and channeling patterns of zipper fracturing under the factory-like development mode of deep shale gas well remain unclear. Based on the finite element-discrete element method, a fluid-solid coupling model for fracture propagation of zipper fracturing was established, which incorporates the influence of natural fracture zone. This model was validated using both experimental data and field-monitored pressure surge data. Taking the deep shale gas reservoirs in southern Sichuan Basin as example, the propagation and channeling patterns of hydraulic fractures under the influences of natural fracture zones with various characteristics were investigated. The results show that the fracture zone with large approaching angle can block the forward propagation of hydraulic fractures and the intersection of inter well fractures. During pump shutdown, hydraulic fractures continue to expand under the net pressure driving. Under high stress difference, as the approaching angle of the fracture zone increases, the pressure increase of response well shows a trend of decreasing and then increasing, and the total length of hydraulic fractures tends to increase and then decrease. Compared to fracture zones with small approaching angle, natural fracture zones with large approaching angles require longer time to intersect; The width of fracture zone and the length of natural fractures, respectively, are negatively and positively correlated with the increase in response well pressure, and positively and negatively correlated with the time required for channeling, the total length of hydraulic fractures, and fracturing efficiency. As the well displacement increases, the probability of fractures channeling decreases, but the influence regularity between the well displacement and the increase in response well pressure and total length of hydraulic fractures is not obvious.

Key words： deep shale gas; zipper fracturing; finite-discrete element; natural fracture zone; fracture propagation and channeling

Cite this article

WANG Qiang , WANG Yufeng , HU Yongquan , ZHAO Jinzhou , SONG Yi , SHEN Cheng . Fracture propagation and channeling of zipper fracturing in deep shale gas wells[J]. Petroleum Exploration and Development, 0 : 20241001 -20241001 . DOI: 10.11698/PED.20240603

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