Method for predicting yield of compact hypotonic gas field multistage fracturing horizontal well

Abstract

The invention discloses a method for predicting yield of a compact hypotonic gas field multistage fracturing horizontal well, and belongs to the field of gas field development. The new method for predicting the yield of the compact hypotonic gas field multistage fracturing horizontal well is provided for solving the problem that an existing horizontal well yield prediction model does not give consideration to influences of factors such as uneven stratums, an air layer drilling encountering rate, a percolating resistance gradient, a variable fracture interval and a variable pressure fracture scale on the fracturing horizontal well yield, can be used for the yield prediction of the compact hypotonic gas field multistage fracturing horizontal well, and provides bases for development, design and optimization. The example verification results show that the prediction results of the method are quite close to measured data of the multistage fracturing horizontal well, and the effect is good. The method for predicting the yield of the compact hypotonic gas field multistage fracturing horizontal well fills the blank that a fracturing horizontal well yield prediction model can simultaneously give the consideration to the influences of the factors such as the uneven stratums, the air layer drilling encountering rate, the percolating resistance gradient, the variable fracture interval and the variable pressure fracture scale on the fracturing horizontal well yield, has the advantages of being simple, strong in operability, effective, practical and the like, and therefore has good popularized use value.

Description

technical field [0001] The invention belongs to the field of gas field development and research, and relates to a production prediction method for multi-stage fracturing horizontal wells in tight low-permeability gas fields, that is, closely combined with the characteristics of tight low-permeability gas fields without fracturing, there will be no production capacity, based on the generalized seepage description equation, and taking into account at the same time For the influence of factors such as formation heterogeneity, gas layer drilling rate, seepage resistance gradient, variable fracture spacing, variable pressure fracture scale and other factors on production, the contribution of each fracture to production is calculated separately, and then the production contribution of each fracture is accumulated. The production of multi-stage fractured horizontal wells is obtained. This method can better reflect the actual seepage and production characteristics of tight low-permeabi...

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Problems solved by technology

Although the numerical simulation method can consider the influence of factors such as formation heterogeneity and variable fracturing scale on production, few software of this type can consider the influence of seepage resistance gradient in tight low-permeability gas fields on the production of multi-stage fractured horizontal wells (especially commercial software), although there are a small number of software developed by researchers themselves that can consider the impact of these factors, it is difficult to be popularized and applied due to issues such as maturity and public release; in addition, numerical simulation methods require many input parameters. Need to build a complex geological model, so the application is extremely inconvenient

Among the various analytical model prediction methods currently reported in the literature, the influence of formation heterogeneity, gas layer drilling rate, seepage resistance gradient and other factors on the production of fractured horizontal wells cannot be considered at the same time, so it is difficult to reflect the tight low permeability gas fields. the actual seepage and production characteristics, it is difficult to guarantee the reliability of the prediction results

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