Hydrofractured water production shale gas well shale gas yield predicting method

Abstract

The invention discloses a hydrofractured water production shale gas well shale gas yield predicting method. The hydrofractured water production shale gas well shale gas yield predicting method comprises the following steps of S1, establishing a shale matrix gas seepage model; S2, establishing a shale fracture seepage mathematic model, S3, according to the shale matrix gas seepage model and the shale fracture seepage mathematic model, acquiring a water production shale gas well seepage mathematic model; S4, solving the water production shale gas well seepage mathematic model through a numericalsimulation method to obtain the shale gas yield of a water production shale gas well. Therefore, by means of the shale matrix gas seepage model and the shale fracture seepage mathematic model, the water production shale gas well seepage mathematic model, which takes into consideration of formation pressure drop influence as well as water saturation increase influence, can be established; by solving the water production shale gas well seepage mathematic model, the shale gas yield of the water production shale gas well can be accurately predicted, and the predicting errors of the shale gas yield can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of shale gas production prediction, and in particular relates to a method for shale gas production prediction of water-producing shale gas wells transformed by hydraulic fracturing. Background technique [0002] In the process of shale gas development, staged hydraulic fracturing of horizontal wells is the main technology for developing shale gas reservoirs. Hydraulic fracturing of shale gas reservoirs can often form large-scale fracture networks with complex fracture structures and large tortuosity. Micro-fractures are very developed, which makes it difficult to flow back the fracturing fluid, and the flow-back time after fracturing is several weeks to several months. The flowback rate of the well section is still only 10% to 50%. Due to the extremely low permeability of the matrix, it is generally difficult for the fracturing fluid to enter the matrix. Therefore, the non-flowback fracturing fluid mainly e...

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Problems solved by technology

[0005] In order to solve the technical problem that the existing shale gas production prediction method only considers the influence of formation pressure drop, but ignores the influence of water saturation rise, resulting in large shale gas production prediction error, the present invention provides a hydraulic fracturing Shale gas production prediction method for modified water-producing shale gas wells

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