Method of increasing fracture network density for shale gas well fracturing improvement

Abstract

The invention relates to the field of shale reservoir stimulation, in particular to a method of increasing fracture network density for shale gas well fracturing improvement.The method includes selecting an oxidizing agent according to target sub-area shale reservoir organic matters and mineral characteristics; adding the oxidizing agent into fracturing fluid prepad fluid and filling the inside of a reservoir with the fracturing fluid prepad fluid along with fracturing fluid.The method has the advantages that the characteristics that the oxidizing agent can oxidize the organic matters, iron pyrite and the like in shale to react to generate heat and gas to form high temperature and high pressure and organic acids in reaction products can corrode carbonate minerals are used, and the effects of fracturing operation energy and the fracturing fluid are fully used, so that a main body fracture network is formed, in other words, the volume is improved; retained fracturing fluid and the mechanics-chemical action of the shale are used to cut shale base blocks in the improved volume or 'crush' the shale base blocks in the improved volume by soaking, in other words, efficiency or density is improved, and gas transportation rate in the improved volume is further increased.

Description

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AI Technical Summary

Benefits of technology

In this new process called Shale Gas Well Fractured Network (SGSN), which involves adding oxygen into oil sands during drilling operations. By reacting these gases with certain rocks under specific conditions like elevated temperatures and pressurized fluids, they create tiny cracks within them through physical processes. These small cracks help improve the transportation properties of crude oil from deep subterranean locations towards production facilities while reducing damage caused by water intrusions. Overall, SGNS enhances hydrocarbon recovery compared to traditional techniques used alone.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the performance of hydrous shale oil (HSC) production processes due to its unique properties including poor conductive ability at small scales, difficulty accessing deeper layers without excessively increasing pressure drop rates, limited dissolution potential within rocks, and environmental concerns associated with disposal after use. Current methods involve injecting fluids into the subterranean strata before drilling but they also cause damage to surrounding areas like fault zones and unintended release of hydrocarbons. Therefore, new ways must be developed to enhance these benefits over existing techniques.

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