Method for predicting pore permeability of reservoir after steam huff and puff

Abstract

The invention discloses a method for predicting porosity and permeability of a reservoir after steam huff and puff, which comprises the following steps: S1, measuring the porosity and permeability of a representative reservoir after different huff and puff rounds; s2, collecting stratum physical property parameters, and calculating the scouring multiple of the corresponding reservoir oil well huff and puff turns in the step S1 in combination with a steam huff and puff working system; s3, performing data analysis on measurement and calculation results in the step S1 and the step S2, and establishing a relationship between the reservoir porosity and permeability change and the scouring multiple; and S4, predicting the porosity and permeability values of different well positions in the same block after different throughput rounds by utilizing the relationship between the reservoir porosity and permeability change and the scouring multiple established in the step S3. According to the method, the variation amplitude of the pore permeability of the reservoir is represented by utilizing the computable scouring multiple, so that specific pore permeability values of different well positions in the same block after multiple rounds of steam huff and puff can be quickly predicted, a relatively accurate data basis is provided for formulating operation measures such as subsequent gas channeling prevention and treatment of the reservoir, and the construction cost is reduced, the construction efficiency is improved and the like.

Description

technical field [0001] The invention belongs to the technical field of oil reservoir development, in particular to a method for predicting reservoir porosity and permeability after steam stimulation. Background technique [0002] As an important petroleum resource, heavy oil is widely distributed in the world. With the continuous growth of demand for oil in social development, my country's development of heavy oil is also gradually increasing. As a simple and effective thermal recovery method for heavy oil, steam huff and puff is widely used in heavy oil development in my country. [0003] When using steam huff and puff for heavy oil recovery, it is generally necessary to carry out multi-cycle huff and puff operations (multiple rounds of steam huff and puff) to effectively heat the reservoir and improve the development effect. However, several or even dozens of huff and puff operations will not only heat the heavy oil in the reservoir to reduce the viscosity, but also make...

AI Technical Summary

Problems solved by technology

However, several or even dozens of huff and puff operations will not only reduce the viscosity of the heavy oil in the reservoir by heating, but also change the porosity and permeability of the reservoir in the area affected by the huff and puff (referred to as pore-permeability) during the huff and puff process. In turn, it will have an impact on the effect of steam stimulation

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