Research On The Methods Of Low Permeability Reservoir Fracturing Pressure Analysis

Fracturing plays an important role in enhanced oil recovery. We can determine the extension of cracks and fractures’geometric parameters during fracturing at any time through analysis the pressure of the process of fracturing. In order to construction program changes at any time, obtain the optimal support of fractures and the best economic, further guidance on the main fracturing or other well fracturing design and construction to improve the level of fracturing effect.Based on the study of fracturing pressure analysis of existing literature, the thesis establishes a new fracture closure model of the fracturing fluid loss. In this model, the flow of fluid reservoir is considered non-Darcy flow, in order to be closer to the flow law of low permeability reservoir fluid. At the same time, the solution of this model is given, and an analysis of factors of fracturing fluid filtration coefficient is done. the thesis also proposes the formula of related parameters, such as fracture length, fracture width, filtration coefficient and initial filtration and so on, by further improving the previous analysis on the method of fracturing and analyzing the pressure of during and after infusion (including fracture closure and fracture closure of post). Made the analysis of the after fracture closure and closure complementary.At the last of this thesis, through the analysis of instance, the feasibility and reliability of this method and model is verified. However, there are still limitations with the method and model, so the specific analysis in application should be made.