Fine layering reconstruction method

Abstract

The invention relates to a fine layering reconstruction method. The method includes the following steps: S101, collecting geology, well drilling, well detection, well logging and well cementation dataand production situations of a to-be-fractured well, calculating rock mechanics parameters, and determining a well completion mode and a perforation scheme; S102, designing a fracturing scheme, and determining the number of fracturing fissures and parameter optimization, wherein parameter optimization includes sand adding scale optimization with continuous section interpretation of ground stressas a basis, construction parameter optimization with obtaining of expected fissure support as a target, and fracturing optimization control with test fracturing as a basis; and S103, ensuring fracturing fluid performance, adjusting a main fracturing pump sequence and providing a temporary plugging agent in a construction process to ultimately increase single-well yield and control reserves. According to the fine layering reconstruction method provided by the invention, the complex network fissures can be formed, a larger reconstruction volume can be obtained, and then the single-well yield andoil and gas recovery ratios are significantly increased. In addition, the method is simple to operate, is lower in costs, and has important significance for development of oil and gas fields.

Description

technical field [0001] The invention relates to the technical field of increasing production of oil and natural gas, in particular to a method for fine layering transformation. Background technique [0002] Low-permeability oil and gas reservoirs with thin interbeds usually require fracturing before they can be produced economically. When developing low-permeability oil and gas reservoirs with thin interbeds, there are many and thin reservoirs, poor interlayer effect, and strong heterogeneity. Ultimately, it leads to problems such as serious formation filtration loss, difficulty in controlling fracture height, and difficulty in construction. [0003] At present, there are many deficiencies in conventional horizontal well segmental stimulation, mainly including the following four aspects: ①The artificial equidistant segmentation method lacks basis and does not consider the heterogeneity of the formation; ②According to the fact that more than 80% of the production capacity com...

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Problems solved by technology

[0002] Low-permeability oil and gas reservoirs with thin interbeds usually require fracturing before they can be produced economically. When developing low-permeability oil and gas reservoirs with thin interbeds, there are many and thin reservoirs, poor interlayer effect, and strong heterogeneity. Ultimately, serious formation filtration loss, difficult control of fracture height, and difficult construction are caused.

[0003] At present, there are many deficiencies in conventional horizontal well segmental stimulation, mainly including the following four aspects: ①The artificial equidistant segmentation method lacks basis and does not consider the heterogeneity of the formation; ②According to the fact that more than 80% of the production capacity comes from about The recognition of 30% intervals, on the one hand, more than 50% of the liquid pumps are injected into formations that do not contribute to production capacity, and on the other hand, the sweet spots of oil and gas enrichment have not been fully reformed, especially the sweet spots of oil and gas enrichment in the In the same section, if only one fracture is opened, the stimulation intensity is far from enough; the efficiency of liquid fracturing is very low; Most of the fractures formed by fractures are single fractures in the traditional sense. The fractures have a single shape, less lateral expansion and extension, and the effective volume of fracturing is smaller. Naturally, less oil and gas resources are produced, and the production is lower and the cumulative output is less. ④Another result of dense segmentation is the use of a large number of segmented tools, which can easily lead to complex downhole conditions and extremely prone to operational accidents such as obstruction and jamming

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