Advanced production decline analysis of tight gas wells with variable fracture conductivity

An Analytical Solution for Transient Productivity Prediction of Multi-Fractured Horizontal Wells in Tight Gas Reservoirs Considering Nonlinear Porous Flow Mechanisms

“…where δ is variable, MPa; p 0 is the initial pressure, MPa; and p is the current pressure, MPa. By substituting Equation (11) into Equation (10), a simplified porous flow equation is derived as follows:…”

“…Because of its strong heterogeneity, complicated microscopic pore structure, and poor connectivity of the effective sand bodies, the porous flow mechanism of tight gas reservoirs is obviously distinct from those of conventional reservoirs. Moreover, because of poor reservoir physical properties, small discharging radius, lack of or low natural productivity, high development difficulty, and some other potential disadvantages, a MFHW with hydraulic stimulations is extensively used for developing tight gas reservoirs [7][8][9][10][11][12][13][14][15][16].To date, many scholars are dedicated to the transient productivity of fractured wells in unconventional hydrocarbon reservoirs, considering the different characteristics of nonlinear flows compared to multi-scale flows. The methods to calculate the transient productivity of fractured horizontal wells primarily include analytical and numerical solutions, among which the analytical solution includes the complex potential theory, conformal transformation, and the equivalent flow resistance method [14,17,18].…”

“…Because of its strong heterogeneity, complicated microscopic pore structure, and poor connectivity of the effective sand bodies, the porous flow mechanism of tight gas reservoirs is obviously distinct from those of conventional reservoirs. Moreover, because of poor reservoir physical properties, small discharging radius, lack of or low natural productivity, high development difficulty, and some other potential disadvantages, a MFHW with hydraulic stimulations is extensively used for developing tight gas reservoirs [7][8][9][10][11][12][13][14][15][16].…”

An Analytical Model for Capturing the Decline of Fracture Conductivity in the Tuscaloosa Marine Shale Trend from Production Data

“…It can decline significantly during production owing to proppant embedment and blockage of debris [25,26]. Experimental investigations have indicated that hydraulic fracture conductivity declines logarithmically or exponentially with time [27,28]. Sun et al [28] demonstrated that the decrease in fracture conductivity could reduce the production decline curve value and lead to a significant production drop.…”

“…Experimental investigations have indicated that hydraulic fracture conductivity declines logarithmically or exponentially with time [27,28]. Sun et al [28] demonstrated that the decrease in fracture conductivity could reduce the production decline curve value and lead to a significant production drop. Production decline analysis failing to take time-dependent fracture conductivity into account will lead to significant errors in production prediction of multi-fractured wells in unconventional shale reservoirs.…”