TY  - EJOU
AU  - Li, Huilin 
AU  - Liu, Dongxi 
AU  - Tang, Wen 
AU  - Xu, Liangjun 
AU  - Yang, Xinrui 
AU  - Wen, Qibing 
AU  - Yang, Licheng 
AU  - Xu, Lu 
AU  - Xia, Tong 
AU  - Tang, Ziyang 
AU  - Liang, Hongbin 

TI  - Evaluation Method of Shale Gas Productivity Considering Desorption Effect
T2  - Energy Engineering

PY  - 
VL  - 
IS  - 
SN  - 1546-0118

AB  - The Sichuan Basin is rich in shale gas, yet the rapid decline in well productivity poses a significant challenge to production forecasting. Therefore, establishing a reliable method for evaluating shale gas productivity is essential for formulating a reasonable development plan for gas wells. However, existing evaluation methods typically treat desorption as a completely reversible process of adsorption, neglecting the influence of desorption hysteresis effect. In this work, it is found that the Langmuir model can describe both the adsorption and desorption processes of shale gas adequately; however, the corresponding adsorption parameters differ between the two processes due to the desorption hysteresis effect. By considering the desorption effect, a modified apparent permeability model and a modified material balance equation are further established. On this basis, by combining the five-linear flow theory, a shale gas productivity evaluation model accounting for the desorption effect is developed, and its reliability is validated using actual shale gas well data from the Sichuan Basin. Model calculations indicate that neglecting the desorption hysteresis effect can result in overestimating well productivity.
KW  - Shale gas; desorption; estimated ultimate recovery; material balance; mathematical model

DO  - 10.32604/ee.2026.086466