Vertical well separate layer fracturing interval optimization and construction parameter optimization designing method

Abstract

The invention provides a vertical well separate layer fracturing interval optimization and construction parameter optimization designing method, and the method comprises the following steps of (1) establishing a porous flow-stress-fracture and damage coupling fracture initiation and dynamic expansion computing method; (2) primarily selecting the fractured interval according to the strata division and the reservoir physical property of the oil and gas reservoir; (3) establishing a reservoir hydrfracturing model, and taking the extension of hydraulic fracture in reservoir stratum as a criterion, and optimizing a first layer of fracture parameter; (4) adopting the first layer of fracture parameter, and calculating fracture shape of the upper part interval; (5) taking non-communication of the upper interval fracture and the lower interval fracture as a criteria, and calculating fracture shape of the upper part interval under different interlayer thickness to determine the interlayer thickness capable of blocking the communication of upper interval fracture and the lower interval fracture; (6) determining the final fracture interval, and optimizing the construction parameters of the upper interval. According to the method provided by the invention, the stress interference of the primary fracture initiation to secondary fracture initiation is taken into account, the communication of the hydraulic fractures of the upper interval and the lower interval is avoided, and the production capacity of each interval is greatly exerted.

Description

technical field [0001] The invention relates to a method for layer optimization and construction parameter optimization design of vertical well layered fracturing layers, which is applicable to the technical field of oil and gas development. Background technique [0002] With the vigorous development of unconventional oil and gas resources, the contradiction between the large differences between layers of oil and gas reservoirs increasingly restricts the balance between vertical layers of oil and gas reservoirs. For reservoirs characterized by many small layers, easy to connect layers, and large differences in physical properties and thickness, general fracturing can easily open the interlayer between two adjacent reservoirs, so that proppant particles are mainly laid in the lower reservoir and interlayer. However, it is difficult for the upper reservoir to be effectively supported, so that the production capacity of the upper reservoir cannot be fully utilized, and the expe...

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Problems solved by technology

[0004] At present, the research on multi-fracture interference between fractures mainly focuses on the inter-fracture interference of vertical fractures in horizontal wells and the inter-fracture interference of horizontal fractures in vertical wells. However, there are few studies on multi-fracture interference in vertical Vertical wells are fractured in layers, and the impact of vertical fractures in the previous fracturing on the growth of vertical fracture height after fracturing has not yet been analyzed in articles.

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