TY  - EJOU
AU  - Yuan, Cuiping 
AU  - Zhong, Sicun 
AU  - Wu, Yijia 
AU  - Chen, Man 
AU  - Wang, Ying 
AU  - Cao, Yinping 
AU  - Chen, Jia 

TI  - Evaluation of Estimated Ultimate Recovery for Shale Gas Infill Wells Considering Inter-Well Crossflow Dynamics
T2  - Fluid Dynamics \& Materials Processing

PY  - 2025
VL  - 21
IS  - 7
SN  - 1555-2578

AB  - Field development practices in many shale gas regions (e.g., the Changning region) have revealed a persistent issue of suboptimal reserve utilization, particularly in areas where the effective drainage width of production wells is less than half the inter-well spacing (typically 400–500 m). To address this, infill drilling has become a widely adopted and effective strategy for enhancing reservoir contact and mobilizing previously untapped reserves. However, this approach has introduced significant inter-well interference, complicating production dynamics and performance evaluation. The two primary challenges hindering efficient deployment of infill wells are: (1) the quantitative assessment of hydraulic and pressure connectivity between infill wells and their associated parent wells, and (2) the accurate estimation of platform-scale Estimated Ultimate Recovery (EUR) following infill implementation. This study presents a novel framework to quantify inter-well connectivity by deriving a material balance equation tailored for shale gas infill well groups, explicitly incorporating gas adsorption and desorption mechanisms. The model simultaneously evaluates formation pressure evolution and crossflow behavior between wells, offering a robust analytical basis for performance prediction. For infill wells intersecting the drainage boundaries of parent wells, EUR is estimated using an analytical model developed for multi-stage hydraulically fractured horizontal wells. Meanwhile, the EUR of the parent wells is obtained by summing their pre-infill EUR with the final inter-well crossflow contribution.
KW  - Shale gas; infill well; well interference; EUR

DO  - 10.32604/fdmp.2025.065151