Transient deliverability evaluation for a slanted well in a slab gas reservoir

The present work provides an algorithm to calculate transient deliverability of a slanted well in a slab gas reservoir. Firstly, transient pressure response of a slanted well has been analyzed and the solutions in Laplace space under three boundary conditions have been derived by point source function and Green function. The solutions in real space can be obtained through the Stehfest inversion by using the superposition principle. Based on the transient pressure analysis, a transient productivity analysis method has been presented in this paper. The influence factors of productivity such as the deviation angle of a slanted well, perforation length, permeability anisotropy ratio, and horizontal permeability to the IPR curve and open-potential rate have been discussed.