A Method for Fractability Evaluation of Complex Reservoirs

An evaluation method and reservoir technology, which can be used in earth-moving drilling, wellbore/well components, instruments, etc., can solve the problem of difficulty in accurately evaluating the fractability of complex reservoirs, and achieve high-efficiency development and safe mining. Accurate evaluation and accurate evaluation

Active Publication Date: 2022-06-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0005] Aiming at the problem that it is difficult to accurately evaluate the fracturing of complex reservoirs at the present stage, the present invention proposes a method for evaluating the fracturing of complex reservoirs, especially suitable for carbonate reservoirs

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  • A Method for Fractability Evaluation of Complex Reservoirs
  • A Method for Fractability Evaluation of Complex Reservoirs
  • A Method for Fractability Evaluation of Complex Reservoirs

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Embodiment Construction

[0060] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings and an example well in a certain carbonate block:

[0061] Taking a well in Tadong Gucheng area as an example, the carbonate reservoir is buried at a depth of 6088-6780m, and the fractability evaluation method of the complex reservoir proposed by the present invention is used to evaluate the fractability of the reservoir, such as figure 1 shown, including the following steps:

[0062] Step 1: The Tadong Gucheng area is a carbonate block. From the core samples collected at 9 depth points of the example wells in this block, 26 standard size core samples with a size of 250 mm were selected for petrophysical experiments. Among them, 18 core samples were used. It is used to conduct in-situ stress test experiments, rock triaxial mechanics experiments and rock failure experiments in sequence, and 8 core samples are used for Brazilian splitting experim...

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Abstract

The invention discloses a method for evaluating the fractureability of complex reservoirs, and specifically relates to the field of oil and gas exploration and development of complex reservoirs. The present invention selects a plurality of rock core samples in complex reservoirs, and sequentially conducts in-situ stress test experiments, rock triaxial mechanics experiments and rock failure experiments on a part of the rock core samples to determine the horizontal in-situ stress difference, brittleness, and residual stress of the rock core samples, The fracture toughness and tensile strength of the core samples were determined by performing the Brazilian splitting experiment on another part of the core samples, and the fitting degree between each parameter and the fracture pressure of the rock samples was determined based on regression analysis, and the weighting coefficients of each parameter were calculated. The data is used to calculate the fracture correction factor, and the measured parameters of rock samples and fracture correction factors are integrated to establish a complex reservoir fracturability evaluation model to evaluate the fracturability of complex reservoirs. The invention improves the accuracy of fracturing evaluation of complex reservoirs, and is beneficial to the efficient development of complex oil and gas resources.

Description

technical field [0001] The invention relates to the field of oil and gas exploration and development of complex reservoirs, in particular to a method for evaluating fractability of complex reservoirs. Background technique [0002] With the continuous increase in demand for oil and gas resources and the development of technology, unconventional oil and gas resources, as an important supplement to conventional oil and gas resources, have received extensive attention from countries around the world. Since unconventional development methods are difficult to effectively develop tight reservoirs with deep burial and poor physical properties, the use of hydraulic fracturing to form complex fracture networks to improve conductivity has become the main means of commercial development of unconventional reservoirs today. The compressibility evaluation of the reservoir is to select the fracturing interval by evaluating the difficulty of the reservoir stimulation, which provides a refere...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20E21B43/26G06F119/14
CPCG06F30/20E21B43/26G06F2119/14
Inventor 张冉孙建孟李庆峰孙天威李召成李晓辉
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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