TY  - EJOU
AU  - Zhang, Haijie 
AU  - Zhao, Haifeng 
AU  - Jiang, Ming 
AU  - Pu, Junwei 
AU  - Luo, Yuanping 
AU  - Chen, Weiming 
AU  - Luo, Tongtong 
AU  - Li, Zhiqiang 
AU  - Yu, Xinan 

TI  - Estimated Ultimate Recovery and Productivity of Deep Shale Gas Horizontal Wells
T2  - Fluid Dynamics \& Materials Processing

PY  - 2025
VL  - 21
IS  - 1
SN  - 1555-2578

AB  - Pressure control in deep shale gas horizontal wells can reduce the stress sensitivity of hydraulic fractures and improve the estimated ultimate recovery (EUR). In this study, a hydraulic fracture stress sensitivity model is proposed to characterize the effect of pressure drop rate on fracture permeability. Furthermore, a production prediction model is introduced accounting for a non-uniform hydraulic fracture conductivity distribution. The results reveal that increasing the fracture conductivity leads to a rapid daily production increase in the early stages. However, above 0.50 D·cm, a further increase in the fracture conductivity has a limited effect on shale gas production growth. The initial production is lower under pressure-controlled conditions than that under pressure-release. For extended pressure control durations, the cumulative production initially increases and then decreases. For a fracture conductivity of 0.10 D·cm, the increase in production output under controlled-pressure conditions is ~35%. For representative deep shale gas wells (Southern Sichuan, China), if the pressure drop rate under controlled-pressure conditions is reduced from 0.19 to 0.04 MPa/d, the EUR increase for 5 years of pressure-controlled production is 41.0 million, with an increase percentage of ~29%.
KW  - Deep shale gas; fracture stress sensitivity; pressure-controlled production; production prediction

DO  - 10.32604/fdmp.2024.053496