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A method for calculating the dosage of water plugging agent for hydraulic fractures in horizontal wells

A technology of hydraulic fracture and calculation method, which is applied in the direction of calculation, design optimization/simulation, special data processing application, etc., and can solve problems such as the influence of fractures that are not considered

Active Publication Date: 2019-01-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

The inventive method is fast and simple to calculate the amount of water blocking agent, and has strong operability, but the method does not consider the influence of fractures, and is mainly suitable for water plugging of horizontal wells in heterogeneous reservoirs that have not undergone manual fracturing

Method used

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  • A method for calculating the dosage of water plugging agent for hydraulic fractures in horizontal wells
  • A method for calculating the dosage of water plugging agent for hydraulic fractures in horizontal wells
  • A method for calculating the dosage of water plugging agent for hydraulic fractures in horizontal wells

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Embodiment 1

[0051] A method for calculating the amount of water plugging agent for hydraulic fractures in horizontal wells, calculating the amount of plugging agent required for plugging the hydraulic fractures at the toe of the horizontal wellbore section of Well XX in Changqing Oilfield, comprising the steps of:

[0052] (1) Design equivalent calculation model

[0053] Simplify the complex single-section fracture network formed by hydraulic fracturing in a horizontal well into an equivalent calculation model consisting of a single macroscopic fracture 5 and a high-permeability matrix 6; the macroscopic fracture 5 penetrates the high-permeability matrix 6 from the middle; where , the main fracture 1 in the complex single-section fracture network formed after hydraulic fracturing is simplified into a single macroscopic fracture 5, and the branch fractures and micro-fractures 3 formed after hydraulic fracturing are simplified into a high-permeability matrix 6;

[0054] (2) Determine the ph...

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Abstract

The invention provides a method for calculating the dosage of water plugging agent for hydraulic fractures in horizontal wells, which comprises the following steps: (1) designing an equivalent calculation model, simplifying a single section complex fracture network formed by hydraulic fracturing of the horizontal wells into an equivalent calculation model composed of a single macrofracture and a high permeability matrix; the macrofracture penetrating the high permeability matrix from the middle; (2) determining the physical parameters of the equivalent calculation model; (3) calculating the filling volume of plugging agent for single section complex joint net; (4) calculation of a total dosage of plugging agent. The calculation method of the invention can realize the quantitative calculation of the required plugging agent dosage, fully considers the plugging agent filtration loss and the filling effect of the plugging agent on the fracture, is accurate and simple and easy to operate, avoids the cost caused by the general injection of the plugging agent in large dosage, ensures the effective plugging of the plugging agent on the fracture, and improves the oil production quality of the oil well.

Description

technical field [0001] The invention relates to a method for calculating the amount of water plugging agent for hydraulic fractures in horizontal wells, and belongs to the technical field of production increase in the oilfield development process. Background technique [0002] The chemical water shutoff of horizontal well fractures in low permeability reservoirs is mainly based on the method and experience of water shutoff in unconsolidated sandstone reservoirs. At present, the widely used horizontal well water plugging agents are still gel-type plugging agents and particle-type plugging agents, and the plugging agent injection process design is also based on empirical calculations. Through the mine field implementation in recent years, some achievements and experience have been obtained in the design of plugging agent injection process, but the overall effect is still not good. [0003] At present, when designing the dosage of plugging agent for fracture water plugging in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 白英睿尚校森魏发林王增宝刘平德
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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