Early warning method and device for hydraulic fracturing sand adding difficult areas

Abstract

The invention discloses an early warning method and device for hydraulic fracturing sand adding difficult areas. The method comprises the steps that the hardness index of a rock core is obtained; theincidence relation between each rock mineral component and an elastic parameter is fit; the incidence relation between the brittleness index and the hardness index is fit; various rock mineral components of a three-dimensional work area reservoir are determined according to elastic parameters of the three-dimensional work area reservoir and the incidence relation between each rock mineral component and the elastic parameters, and the brittleness index of the three-dimensional work area reservoir is determined; the hardness index of the three-dimensional work area reservoir is determined according to the brittleness index of the three-dimensional work area reservoir and the incidence relation between the brittleness index and the hardness index; and according to the hardness index, the crack strength, the micro-amplitude structure and the sand adding amount of the three-dimensional work area reservoir, the hardness index, the crack strength and the micro-amplitude structure corresponding to different sand adding amounts are determined, then the types of sand adding difficult areas corresponding to different sand adding amounts are determined, and early warning of the sand adding difficult areas before fracturing is conducted. Early warning of the sand adding difficult areas before fracturing is achieved.

Description

technical field [0001] The invention relates to the technical field of hydraulic fracturing, in particular to an early warning method and device for hydraulic fracturing in Gaza difficult areas. Background technique [0002] Hydraulic fracturing is a key technology for shale gas development. However, due to the complex geological structure of marine shale and the development of micro-fractures, it is often difficult to add sand during hydraulic fracturing, and in severe cases, it may even lead to sand plugging and other projects. Risks directly affect the effect of shale gas hydraulic fracturing and maximize productivity. The existing technology mainly adjusts fracturing parameters and construction schemes based on the results of on-site fracturing curves and microseismic monitoring, such as increasing pump pressure, reducing the amount of sand added, and acidizing measures. [0003] Although this method can reduce the difficulty of adding sand to a certain extent, there ar...

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Problems solved by technology

[0003] Although this method can reduce the difficulty of adding sand to a certain extent, there are many factors that affect the difficulty of adding sand. Adjusting fracturing parameters and construction plans based on the results of on-site fracturing curves and microseismic monitoring only considers adding sand from an engineering perspective. The reason for the difficulty is that it is more suitable for reservoirs with simple geological structures and no fractures, but for marine shale with complex geological structures and micro-fractures, it often cannot achieve good results, especially at the current stage of shale gas hydraulic fracturing. Many wells are fracturing at the same time on site, and the geological conditions of the reservoir have a greater impact on hydraulic fracturing. Due to the lack of monitoring and early warning methods for sanding difficult areas in the existing technology, it is difficult to effectively reduce the hydraulic fracturing during construction. It is difficult to add sand, which seriously affects the effect of shale gas hydraulic fracturing

[0004] For the above problems, no effective solution has been proposed

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