A Quantitative Method for Evaluating the Plugging Strength of Temporary Plugging Agents
A technology of quantitative evaluation and temporary plugging agent, applied in the field of hydraulic fracturing production, which can solve the problems of affecting production, unable to achieve effective fracture diversion, and easily damaged temporary plugging agent plugging layer, etc.
Active Publication Date: 2021-04-13
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
When the plugging strength of the temporary plugging agent is not high enough, the fracturing fluid will easily destroy the plugging layer of the temporary plugging agent when it passes through the temporary plugging agent, so that the effective diversion of fractures cannot be realized, which seriously affects the production after stimulation
At present, there is a lack of quantitative evaluation methods for determining the plugging strength of temporary plugging agents
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[0051] The technical solution of the present invention will be further specifically described below through the embodiments and the accompanying drawings.
[0052] A method for quantitatively evaluating the plugging strength of a temporary plugging agent of the present invention comprises the following steps:
[0053] Step S10, collecting relevant parameters of the target reservoir's in-situ stress, formation fluid properties, and physical properties of the temporary plugging agent;
[0054] In the present invention, surface pressure, formation pressure, maximum horizontal principal stress, minimum horizontal principal stress, particle diameter of temporary plugging agent, interfacial tension, combination of temporary plugging agents with different particle sizes, contact angle, friction coefficient of temporary plugging agent plugging layer, Parameters such as internal friction angle, shear modulus, porosity, water saturation, hydraulic fracture height, and bottom hole pressu...
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The invention discloses a method for quantitatively evaluating the plugging strength of a temporary plugging agent. Mechanics-mathematical model; based on the static mechanics-mathematical model of the temporary plugging agent in the fracture, the mechanical model of the plugging strength of the temporary plugging agent is established; based on the mechanical model of the plugging strength of the temporary plugging agent and related parameters, the fluid pressure drop of the plugging layer of the temporary plugging agent is calculated gradient. The invention fully considers the gas-liquid two-phase flow in the hydraulic fractures of the tight gas reservoir, and considers the capillary force, drag force, minimum horizontal principal stress, and shearing of the temporary plugging agent with different particle size combinations. Based on the comprehensive influence of the strength, starting from the stress analysis of a single temporary plugging agent, a mechanical model describing the plugging strength of the temporary plugging agent is established, and a quantitative calculation method for predicting the plugging strength of the temporary plugging agent is formed.
Description
technical field [0001] The invention relates to a method for quantitatively evaluating the plugging strength of a temporary plugging agent, belonging to the technical field of hydraulic fracturing. Background technique [0002] Hydraulic fracturing is one of the commonly used stimulation techniques for low-permeability oil and gas reservoirs. Conventional hydraulic fracturing usually can only form a single fracture, the control area and stimulated volume are limited, and the production cannot be significantly increased. In order to increase the volume and complexity of hydraulic fracture stimulation, temporary plugging fracturing is an effective method. Its basic principle is to form a tight sealing layer by injecting temporary plugging agent during hydraulic fracturing. It can temporarily block the previously formed high-permeability flow channels of hydraulic fractures, increase the seepage resistance of fracturing fluid, and force the working fluid to divert to fracturin...
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IPC IPC(8): E21B33/13E21B43/26
CPCE21B33/13E21B43/26
Inventor 曾凡辉张蔷郭建春张宇
Owner SOUTHWEST PETROLEUM UNIV