A numerical analysis method for multi-section volume fracturing horizontal well of tight gas

Abstract

The invention relates to a numerical analysis method for dense gas multi-section volume fracturing horizontal well, comprising the following steps: step 1, establishing a geological structure model ofthe network fracture of the multi-section volume fracturing horizontal well; 2, establishing a heterogeneous geological body of fractured horizontal well network fracture; 3, establish a well test mathematical model of a compact gas multi-stage fracturing horizontal well base on that fracture network form; 4, carrying out numerical solution on a network fractured horizontal well test model by using a mixed element finite element method; 5, generating a multi-section volume fracturing horizontal well actual t well curve according to that well test data, and fitting the theoretical curve solvedby the model in the step 4 with the actual measurement curve to obtain the well test interpretation parameters. This method is of great significance to improve the interpretation accuracy of volume fracturing horizontal wells, to obtain the parameters of volume fracturing network and to evaluate the effect of volume fracturing. The invention has the characteristics of good well test curve fitting, accurate interpretation result, strong practicability and the like.

Description

technical field [0001] The invention relates to a numerical well test interpretation method for multi-stage volume fracturing horizontal wells of tight gas based on network fractures, or a numerical analysis method for multi-stage volume fracturing horizontal wells of tight gas. Background technique [0002] Multi-stage volume fracturing of horizontal wells is currently the main method for the stimulation of tight oil and gas reservoirs. Volume fracturing can form complex fracture networks, increase the contact area between the wellbore and the reservoir, and reduce seepage resistance, thereby greatly increasing the single well production of tight oil and gas, realizing Economic exploitation of tight oil and gas. Well test interpretation and evaluation of fractured horizontal wells is an important means to obtain fracture parameters and reservoir parameters after fracturing, and it is also an effective method to directly verify the seepage mechanism, which provides a basis f...

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Problems solved by technology

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a numerical analysis method for multi-stage volume fracturing horizontal wells of tight gas with fast calculation speed, good curve fitting, and accurate interpretation results, so as to solve the current problem of tight gas multi-stage Well test data of volume fracturing horizontal wells cannot be interpreted to obtain fracture network parameters. This method can greatly improve the accuracy of well test interpretation of volume fracturing horizontal wells. The effect of crack reform provides an effective method

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