Establishment And Application Of Prediction Model For Fracturing Gas Well Production

With the growing demand for oil and gas, the technique of exploiting and exploring low permeability is very significant. Hydraulic fracturing has been applied to a lot of oil and gas reservoir as an effective method to promote the exploit. It is important for optimization of fracture parameter and the project to select well performance model.This paper investigates the large number of domestic and international literature.Make a production model of fracturing well based on the previous achievement. The follow works are done:(1)This paper present a mathematical model with a finite conductivity vertical fracture in a gas reservoir,based on the strict seepage methodology for real gas flow process applied for transient flow. The equation of dimensionless pressure drop is obtained by applying Green and source functions and the Newman product method. A discrete function of dimensionless wellbore pressure and dimensionless time is plotted to study the productivity in the early time through the bidirectional interpolation in different fracturing parameter. The method is used for the dynamic production prediction of a fractured gas well in Suligu low permeability gas field.(2)Bring in dimensionless fracture spatial position from the wellbore XD*, XD*is a function of FCD and this paper present the expression. The paper presents the general expression of dimensionless pressure in bounded reservoir during pseudo steady state flow. In addition, the equation to determine the start time of the pseudo steady state is formulated for a fractured well in bounded zones.Unite the unsteady production model to give result of hydraulic fracturing optimization with different formation permeability and the trend affected by fracturing length and conductivity capacity.(3)Coupled the performance model of infinite reservoir and the model of bounded reservoir during pseudo steady state flow to predict production and obtain optimization of fracture parameters with different permeability. The paper obtain effect of conductivity influenced by fracture high, length.(4)Present a new mathematical model which is based on superposition theory combined with the theory of underground fluid flow to forecast the fractured horizontal well.The model considers fracture parameters and numerous fractures production which consider the mutual disturbance. Analyze the six-month production of equal fracture length, not equal space between split and equal space, not equal fracture length in order to optimize the project.(5)This paper aims to use Matlab to compute the performance model of fractured gas well in order to predict the well product to provide reference designs in the site.