Bottom water reservoir fracturing method adopting water-deformable propping agent to control water breakthrough

Abstract

The invention belongs to the technical field of oil production engineering and particularly relates to a bottom water reservoir fracturing method adopting a water-deformable propping agent to control water breakthrough. The bottom water reservoir fracturing method comprises the steps that 1, perforation is performed at the top position of a bottom water reservoir; 2, fracturing construction begins, an oil-based fracturing fluid is used as an ahead fluid to be injected into a stratum to cause crack initiation and make artificial fracture; 3, the oil-based fracturing fluid is adopted to carry the propping agent to flow into the stratum, wherein the propping agent does not change when encountering oil but is softened and produces deformation and solidification when encountering water; 4, the propping agent is softened and produces deformation and solidification to form a high-strength penetration-free blocking layer when encountering water in the fracturing construction process; 5, an oil-based fracturing fluid base fluid is used for replacing a sand-carrying fluid to flow into the stratum, wherein the using amount of the base fluid for replacement is equivalent to the volume of an operating tool string; 6, well shutdown is performed for 60 minutes, and blowout and production are performed. By the adoption of the bottom water reservoir fracturing method, the problem that existing cracks downwards extend to be communicated with bottom water, the blocking capability of an oil-water layer interface is improved through the water-deformable propping agent, and upward bottom water breakthrough is controlled.

Description

technical field [0001] The invention relates to the technical field of oil recovery engineering, in particular to a bottom water oil reservoir fracturing method using a water-deformable proppant to control water channeling. Background technique [0002] Reservoirs with low permeability and bottom water have geological characteristics such as complex oil-water relationship, poor physical properties, and poor blocking ability between oil and water layers. How to control the fracture height within the production layer and avoid communication with bottom water is the key to the success of this type of reservoir stimulation. factor. The current existing reconstruction methods have the following main problems: poor physical properties, perforation or acidification to obtain no liquid volume for initial production; , low shot opening degree) small fracturing can easily cause the fracture height to get out of control and communicate with bottom water. Therefore, it is necessary to...

AI Technical Summary

Problems solved by technology

The current existing reconstruction methods have the following main problems: poor physical properties, perforation or acidification to obtain no liquid volume for initial production; , low penetration degree) small fracturing can easily cause the fracture height to get out of control and communicate with the bottom water

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