A Trinomial Deliverability Calculation Method for Shale Gas Wells Considering the Effect of Adsorbed Gas

doi:10.3969/j.issn.1006-6535.2023.03.017

Abstract

Abstract: To address the problem of the unclear effect law of the shale gas adsorption-desorption on the deliverability of production wells, based on the seepage characteristics and deliverability equation of tight gas wells, a deliverability model considering shale gas adsorption-desorption was established with reference to the gas seepage differential equation and in combination with the Langmuir isothermal adsorption equation; the deliverability and open flow capacity of shale gas wells under different desorption time were calculated based on the drilling and completion and dynamic monitoring data of shale gas wells, and the effect of adsorbed gas was transformed into additional resistance coefficients based on the information of back-pressure well testing to form a trinomial deliverability calculation equation, and this equation was used to study the effect of adsorbed gas on shale gas deliverability calculation. The results show that the adsorbed gas will cause a higher initial deliverability calculation value of shale gas wells, and the calculated open flow capacity is relatively stable after 10 d of desorption; the adsorbed gas content has a greater influence on the deliverability of shale gas wells, and the adsorption pressure has a smaller influence on the deliverability; the error between the results of the trinomial deliverability calculation and the analytical method model calculation is less than 12%, and the results are more reliable. The research results can be used as a reference for the deliverability evaluation of shale gas wells.

Key words: shale gas, deliverability, trinomial, adsorbed gas

CLC Number:

TE332

Fang Dazhi, Liu Hong, Pang Jin, Gu Hongtao, Ma Weijun. A Trinomial Deliverability Calculation Method for Shale Gas Wells Considering the Effect of Adsorbed Gas[J]. Special Oil & Gas Reservoirs, 2023, 30(3): 137-142.

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