A method for scientific calculation of soaking time based on rock skeleton theory

Abstract

The present invention provides a method for scientifically calculating the soaking time based on the rock skeleton theory, which is to maintain the shale due to the inherent characteristics of permeability, disintegration, softening and expansion of the shale itself when the shale oil and gas are fracturing. Based on the shale skeleton structure, the hydration expansion of the complex fracture network is formed to the greatest extent. It is necessary to scientifically calculate the soaking time to achieve the optimal hydration effect of the shale. The method calculates the soaking time by introducing pressure normalized increments. Before on-site construction, it is necessary to collect cuttings (cores) at the front, middle and back ends of the well drilling process for indoor immersion experiments to obtain pressure normalized The shale soaking softening time and shale soaking disintegration time in the incremental correlation equation; and then according to the geological data, fracturing design and logging comprehensive interpretation to obtain the ion suppression coefficient and basic parameters, and determine the pressure normalization of different soaking times Increment and curve fitting to obtain the best soaking time of the well.

Description

technical field [0001] The invention relates to the field of shale gas exploitation, in particular to a method for scientifically calculating the soaking time based on rock skeleton theory after fracturing reformation. Background technique [0002] In recent years, with the rapid development of China's national economy, the demand for oil and natural gas is also increasing. The domestic conventional oil and gas production can no longer meet the demand. The supply and demand situation of oil and gas resources is becoming more and more severe. Exploration and development field. Due to the severe energy situation, unconventional shale reservoirs are gradually being paid attention to. Strengthening the exploration and development of shale oil and gas resources can make up for the shortage of existing conventional oil and gas resources and promote the sustainable development of the oil and gas industry. It is of great significance to ensure the security of national energy supply...

AI Technical Summary

Problems solved by technology

[0007] The invention provides a method for scientifically calculating the soaking time based on the theory of rock skeleton, specifically, a method for scientifically calculating the soaking time based on the theory of maintaining the integrity of the rock skeleton, to solve the problems in the prior art that mainly rely on field experience, development There is a lot of blindness and arbitrariness in determining the soaking time according to the progress and engineering parameters, which leads to the unsatisfactory problem of increasing the production of a single well after soaking

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