Advanced production decline analytical method for a multi-fractured horizontal well in shale gas reservoirs

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  • School of Petroleum & Natural Gas Engineering,Southwest Petroleum University,Chengdu 610500,China

Received date: 2015-06-10

  Revised date: 2015-07-22

  Online published: 2019-09-20

Abstract

Multi-stage fractured horizontal well (MFHW) technology is widely applied in typical ultra-low porosity and permeability shale gas reservoirs.Compared to conventional reservoirs,there are several transport mechanisms such as adsorption/desorption,diffusion and Darcy flow in the shale gas reservoirs.And there is a significant limitation of using analytical/semi-analytical method to analyze transient pressure behaviors since a strong nonlinear relationship between adsorption/desorption,diffusion and pressure.Thus,Based on multi-fractured horizontal well(MFHW)’s perpendicular bisection (PEBI) grids,the production decline numerical mathematical model of infinite conductive MFHW which considers adsorption/desorption,diffusion and Darcy flow in shale gas reservoir is established and derived by introducing the Dusty Gas Model.According to the basic principle of Blasingame production decline,the Blasingame production decline typical curves are calculated through computer programming.The results show that the flow behaviours of infinite conductive MFHW’s Blasingame production decline typical curves are divided into four stages (i.e.,early formation linear flow around fracture,early radial flow,compound linear flow,and pseudo-radial elliptic flow).The effect of adsorption/desorption is stronger,q/Δpp、(q/Δpp)and (q/Δpp)idvalue become larger,meanwhile the typical curves are influenced by PL nonlinearly,and by VL linearly.The flow capability in shale gas reservoirs with ultra-permeability and the well rate can be improved by diffusion parameter.As the formation permeability (k),fracture number (nf),and fracture half-length (xf) increase,the values of q/Δpp、(q/Δpp)i and (q/Δpp)id of the production decline type curves become larger.The fracture spacing df influences the compound linear flow stage of production decline typical curves,and the compound linear flow appears later with df increasing.And the pseudo-radial flow is mainly affected by distance from the well to the circular boundary (re).When re increases,the pseudo-radial flow appears lately.

Cite this article

Wei Ming-qiang, Duan Yong-gang, Fang Quan-tang, Li An-hao, Lu Ting . Advanced production decline analytical method for a multi-fractured horizontal well in shale gas reservoirs[J]. Natural Gas Geoscience, 2016 , 27(5) : 898 -904 . DOI: 10.11764/j.issn.1672-1926.2016.05.0898

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