Shale gas well dynamic production allocation method

Abstract

The invention provides a shale gas well dynamic production allocation method. The shale gas well dynamic production allocation method comprises the steps of step 1, constructing a shale gas well single well material balance equation; step 2, establishing a single-well actual material balance equation in combination with the step 1 according to actual shale gas well related reservoir properties, and establishing a relation function about accumulated gas production and formation pressure; step 3, calculating the accumulated gas production according to the current formation pressure; step 4, establishing a binomial productivity equation through productivity well testing, and performing production allocation according to unchoked flow; step 5, drawing a plate of the accumulated gas production,the formation pressure and the single well production allocation according to the production allocation result obtained in the step 4; and step 6, according to different oil deposit accumulated gas production of a shale gas well, searching the obtained plate for production allocation. By the adoption of the scheme, rapid production allocation can be achieved, in the gas well production process, the reasonable production allocation can be rapidly determined by searching the plate according to the current accumulated gas production of the gas well, time factors do not need to be considered in the production allocation process, and the method is very convenient, efficient and practical.

Description

technical field [0001] The invention belongs to the technical field of shale gas exploration and development, and in particular relates to a method for dynamic production allocation of shale gas wells. Background technique [0002] In the process of shale gas exploration and development, conventional shale gas production allocation methods (such as decline curve analysis method) have large prediction errors and the production allocation process is complicated. [0003] In addition, the document CN104948163B discloses a method for measuring the productivity of shale gas wells. The steps include: testing, collecting and setting gas reservoir engineering parameters, and establishing the gas well productivity equation; The material balance equation of the shale gas reservoir in the fractured stimulation area; according to the gas well productivity equation, calculate the initial production of the gas well at the initial time; set the time step, calculate the time corresponding t...

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Problems solved by technology

[0004] However, in the shale gas production site and production stage, it is often necessary to rapidly prorate the production of shale gas wells. Although the production proration method mentioned above can meet the production requirements, it can only give proration for the current production data. Or it is necessary to carry out calculations for a specific moment multiple times, the production allocation process is still complicated, and the production allocation efficiency is still low

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