Vertical Permeability Determination From Pressure Buildup Tests in Partially Perforated Wells

1990 ◽  
Author(s):  
R.S. Barnum ◽  
K.A. Frederick
Keyword(s):  
Pressure Buildup ◽  
Vertical Permeability

Test Design for Vertical Permeability Determination from a Conventional Pressure Buildup Test

2006 ◽  
Author(s):  
Christine A. Ehlig-Economides ◽  
Moses Asuquo Nduonyi ◽  
Joseph Abiazie
Keyword(s):  
Test Design ◽  
Pressure Buildup ◽  
Vertical Permeability

Development of a Transient Model for Fluid Flow, Heat Transfer and Pressure Buildup in Wellbores

2020 ◽  
Author(s):  
Ianto Martins ◽  
Arthur Pandolfo da Veiga ◽  
Eduardo Alves ◽  
Jader Barbosa
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Transient Model ◽  
Pressure Buildup ◽  
Flow Heat

Investigation and Optimization of the Effects of Geologic Parameters on the Performance of Gravity-Stable Surfactant Floods

SPE Journal ◽  
2016 ◽  
Vol 21 (03) ◽  
pp. 761-775 ◽  
Author(s):  
Shayan Tavassoli ◽  
Gary A. Pope ◽  
Kamy Sepehrnoori
Keyword(s):  
Salinity Gradient ◽  
Horizontal Wells ◽  
Sensitivity Study ◽  
Third Order ◽  
Fine Grid ◽  
Heterogeneous Reservoirs ◽  
Vertical Permeability ◽  
Well Spacing ◽  
Optimization Schemes ◽  
Very High

Summary A systematic simulation study of gravity-stable surfactant flooding was performed to understand the conditions under which it is practical and to optimize its performance. Different optimization schemes were introduced to minimize the effects of geologic parameters and to improve the performance and the economics of surfactant floods. The simulations were carried out by use of horizontal wells in heterogeneous reservoirs. The results show that one can perform gravity-stable surfactant floods at a reasonable velocity and with very-high sweep efficiencies for reservoirs with high vertical permeability. These simulations were carried out with a 3D fine grid and a third-order finite-difference method to accurately model fingering. A sensitivity study was conducted to investigate the effects of heterogeneity and well spacing. The simulations were performed with realistic surfactant properties on the basis of laboratory experiments. The critical velocity for a stable surfactant flood is a function of the microemulsion (ME) viscosity, and it turns out there is an optimum value that one can use to significantly increase the velocity and still be stable. One can optimize the salinity gradient to gradually change the ME viscosity. Another alternative is to inject a low-concentration polymer drive following the surfactant slug (without polymer). Polymer complicates the process and adds to its cost without a significant benefit in most gravity-stable surfactant floods, but an exception is when the reservoir is highly layered. The effect of an aquifer on gravity-stable surfactant floods was also investigated, and strategies were developed for minimizing its effect on the process.

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