Integrated Approach to Drilling Project in Unconventional Reservoir Using Reservoir Simulation

Abstract

Abstract. Accumulation and flow mechanisms in unconventional reservoir are different compared to conventional. This requires a special approach of field management with drilling and stimulation treatments as major factor for further production. Integrated approach of unconventional reservoir production optimization assumes coupling drilling project with full scale reservoir simulation for determine best well placement, well length, fracturing treatment design and mid-length distance between wells. Full scale reservoir simulation model emulate a part of polish shale -gas field. The aim of this paper is to establish influence of technical factor for gas production from shale gas field. Due to low reservoir permeability, stimulation treatment should be direct towards maximizing the hydraulic contact. On the basis of production scenarios, 15 stages hydraulic fracturing allows boost gas production over 1.5 times compared to 8 stages. Due to the possible interference of the wells, it is necessary to determine the distance between the horizontal parts of the wells trajectories. In order to determine the distance between the wells allowing to maximize recovery factor of resources in the stimulated zone, a numerical algorithm based on a dynamic model was developed and implemented. Numerical testing and comparative study show that the most favourable arrangement assumes a minimum allowable distance between the wells. This is related to the volume ratio of the drainage zone to the total volume of the stimulated zone.

Pseudo-Steady-State Parameters for a Well Penetrated by a Fracture with an Azimuth Angle in an Anisotropic Reservoir

“…Substituting Equation (13) into Equations (8) and (10), the infinite-conductivity fracture equivalent pressure solution in an isotropic rectangular reservoir can be further expressed as follows:…”

“…Hydraulic fracturing can increase the productivity of tight porous medium. There are many solutions, including the analytical type, semi-analytical type, and numerical type, to investigate the flow efficiency of fractured wells in the transient period [13][14][15][16][17][18][19]. However, there are few researches focusing on the pseudo-steady-state problem of fractured wells.…”