Method for evaluating fracturing property of complex reservoir

An evaluation method and reservoir technology, applied in the fields of earth drilling, special data processing applications, and mining fluids, etc., can solve problems such as difficult to accurately evaluate the fracturing of complex reservoirs, and achieve efficient development and safe mining. Strong applicability and accurate evaluation

Active Publication Date: 2021-02-02
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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  • Method for evaluating fracturing property of complex reservoir
  • Method for evaluating fracturing property of complex reservoir
  • Method for evaluating fracturing property of complex reservoir

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Embodiment Construction

[0060] Below in conjunction with accompanying drawing and certain carbonatite block example well is example, the specific embodiment of the present invention is described further:

[0061] Taking a certain well in the ancient city of Tadong as an example, the burial depth of the carbonatite reservoir is 6088-6780m, and the fracability evaluation method of the complex reservoir proposed by the present invention is used to evaluate the fracability of the reservoir, as shown in figure 1 As shown, it specifically includes the following steps:

[0062] Step 1. The Tadong ancient city area is a carbonatite block. Among the core samples collected at 9 depth points in the example wells of this block, 26 standard-sized core samples with a size of 250 mm were selected for petrophysical experiments, of which 18 core samples 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 B...

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Abstract

The invention discloses a method for evaluating fracturing property of a complex reservoir, and particularly relates to the field of oil and gas exploration and development of complex reservoirs. Themethod comprises the following steps: selecting a plurality of rock core samples in a complex reservoir, sequentially carrying out a crustal stress test experiment, a rock triaxial mechanical experiment and a rock damage experiment on one part of the rock core samples, determining the horizontal crustal stress difference, brittleness and residual stress of the rock core samples, carrying out a Brazilian split test on the other part of the rock core samples, determining the fracture toughness and tensile strength of the rock core samples, determining the fitting degree between parameters and the fracture pressure of the rock samples based on regression analysis, calculating weighting coefficients of the parameters, calculating a crack correction factor by utilizing logging data, establishing a complex reservoir fracturing evaluation model by integrating measurement parameters of the rock samples and the crack correction factor, and evaluating the fracturing property of the complex reservoir. According to the method, the accuracy of evaluation of the fracturing property of the complex reservoir is improved, and efficient development of complex oil and gas resources is facilitated.

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 the fracturing 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 attracted widespread attention from all over 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 and improve conductivity has become the main means of commercial development of unconventional reservoirs today. The fracability evaluation of reservoirs optimizes fracturing intervals by evaluating the difficulty of reservoir stimulation, which provides a reference for formulating ...

Claims

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Application Information

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Patent Type & Authority Applications(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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