Method for calculating dynamic reserve of dense oil fractured horizontal well

Abstract

The present invention provides a method for calculating a dynamic reserve of a dense oil fractured horizontal well, and relates to the technical field of dense oil fractured horizontal wells. The method comprises: dividing a dense oil fractured horizontal well into a first percolation region and a second percolation region; dividing a production process of the dense oil fractured horizontal well into a first stage and a second stage; calculating a first average formation pressure of the first percolation at each time in the first stage, and calculating a second average formation pressure of the first percolation region and a third average formation pressure of the second percolation region at each time in the second stage; according to a pre-established mass balance equation, determining a dynamic reserve of the first percolation region in the first stage as a dynamic reserve of the dense oil fractured horizontal well of the first stage; and according to the pre-established mass balance equation, determining a dynamic reserve of the first percolation region and a dynamic reserve of the second percolation region in the second stage, and determining a sum of the dynamic reserve of the first percolation region and the dynamic reserve of the second percolation region to be a dynamic reserve of the dense oil fractured horizontal well in the second stage.

Description

technical field [0001] The invention relates to the technical field of tight oil fracturing horizontal wells, in particular to a method for calculating dynamic reserves of tight oil fracturing horizontal wells. Background technique [0002] In the field of oil production, dynamic reserves refer to the sum of the volumes converted to the standard conditions of the fluids that can finally flow effectively under the conditions of the existing production technology level and the current stage in the connected pore volume of the oil and gas reservoir. This dynamic reserve is time-varying. The dynamic reserve is a main index in the oil and gas reservoir exploitation. Only when the size of the dynamic reserve is determined, can the analysis of the development dynamics and the exploitation mechanism be carried out, and the development status of the oil and gas reservoir can be understood. [0003] At present, the conventional methods for calculating dynamic reserves mainly include ...

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Problems solved by technology

[0005] The embodiment of the present invention provides a method for calculating dynamic reserves of fracturing horizontal wells in tight oil, so as to solve the difficulty in accurately predicting the dynamic reserves and low seepage of fracturing horizontal wells in tight oil by the conventional material balance method and partitioned material balance method in the prior art The Problem of Cumulative Supply of Areas to High Seepage Areas

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