Pressure Behavior of a Hydraulic Fractured Well in Tight Gas Formation with Threshold Pressure Gradient

2012 ◽  
Author(s):  
Jing Lu
Keyword(s):  
Pressure Gradient ◽  
Threshold Pressure ◽  
Tight Gas ◽  
Threshold Pressure Gradient ◽  
Pressure Behavior ◽  
Gas Formation ◽  
Tight Gas Formation ◽  
Fractured Well

scholarly journals Tight gas production model considering TPG as a function of pore pressure, permeability and water saturation

2020 ◽  
Vol 17 (5) ◽  
pp. 1356-1369
Author(s):  
Atif Zafar ◽  
Yu-Liang Su ◽  
Lei Li ◽  
Jin-Gang Fu ◽  
Asif Mehmood ◽  
...  
Keyword(s):  
Pressure Gradient ◽  
Pore Pressure ◽  
Water Saturation ◽  
Great Influence ◽  
Gas Production ◽  
Production Model ◽  
Threshold Pressure ◽  
Tight Gas ◽  
Gas Field ◽  
Threshold Pressure Gradient

Abstract Threshold pressure gradient has great importance in efficient tight gas field development as well as for research and laboratory experiments. This experimental study is carried out to investigate the threshold pressure gradient in detail. Experiments are carried out with and without back pressure so that the effect of pore pressure on threshold pressure gradient may be observed. The trend of increasing or decreasing the threshold pressure gradient is totally opposite in the cases of considering and not considering the pore pressure. The results demonstrate that the pore pressure of tight gas reservoirs has great influence on threshold pressure gradient. The effects of other parameters like permeability and water saturation, in the presence of pore pressure, on threshold pressure gradient are also examined which show that the threshold pressure gradient increases with either a decrease in permeability or an increase in water saturation. Two new correlations of threshold pressure gradient on the basis of pore pressure and permeability, and pore pressure and water saturation, are also introduced. Based on these equations, new models for tight gas production are proposed. The gas slip correction factor is also considered during derivation of this proposed tight gas production models. Inflow performance relationship curves based on these proposed models show that production rates and absolute open flow potential are always be overestimated while ignoring the threshold pressure gradients.

The Moving Boundary Movement of Vertical Fractured Well in Tight Oil Reservoir

2013 ◽  
Vol 868 ◽  
pp. 633-637
Author(s):  
Li Feng Liu ◽  
Xin Wang
Keyword(s):  
Pressure Gradient ◽  
Flow Model ◽  
Moving Boundary ◽  
Flow Characteristics ◽  
Seepage Flow ◽  
Threshold Pressure ◽  
Threshold Pressure Gradient ◽  
Tight Reservoir ◽  
Tight Reservoirs ◽  
Fractured Well

Because of the obvious non-Darcy characteristic of fluid flowing in tight reservoirs, there is a virtual moving boundary at the flow edge, and these percolation models of fractured wells with Darcy formula are no longer applicable. Based on the threshold pressure gradient effect, the unsteady seepage flow model of vertical fractured well was established in the drain area by means of Source and Green's Functions. With the flow characteristics at the boundary of tight reservoir, the motion equation of axes of moving boundary was obtained. By Example analysis, its proved that the moving boundary is approximate circular in the far-field, and it will move slower with the increase of the threshold pressure gradient.

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