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Fracture-vug type reservoir productivity determination method and system considering stress sensitivity

A stress-sensitive, fracture-cavity technology, applied in special data processing applications, instruments, design optimization/simulation, etc., can solve the problem of inability to accurately characterize the productivity relationship of fractured reservoirs and provide effective guidance for the development of fractured-cavity reservoirs and other issues to achieve the effect of ensuring scientificity and accuracy, accurate production capacity changes, and improved applicability

Active Publication Date: 2021-11-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing technology, only the high-speed non-Darcy effect is considered to analyze the productivity of fracture system reservoirs, and it is impossible to accurately characterize the productivity relationship of fracture system reservoirs and provide effective guidance for the development of fracture-vuggy reservoirs.

Method used

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  • Fracture-vug type reservoir productivity determination method and system considering stress sensitivity
  • Fracture-vug type reservoir productivity determination method and system considering stress sensitivity
  • Fracture-vug type reservoir productivity determination method and system considering stress sensitivity

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Embodiment 1

[0070] figure 2 A schematic flowchart of the method for determining the productivity of a fractured-cavity reservoir considering stress sensitivity provided in Embodiment 1 of the present invention is shown. Refer to figure 2 It can be seen that the method includes the following steps:

[0071] Step S110 , taking the single fracture-cavity physical model as the main fracture-cavity system model, and expanding the secondary fracture-cavity system model based on the main fracture-cavity model to form a parallel fracture-cavity conceptual model including the main fracture-cavity system model and the secondary fracture-cavity system model.

[0072] Specifically, in practical applications, the process of expanding the secondary fracture-hole system model based on the primary fracture-hole model may include:

[0073] Taking a fracture and a cave as a fracture-cavity unit, the sub-fractures of the secondary fracture-cave system are connected to the set position of the main fracture ...

Embodiment 2

[0167] Based on other aspects of the above embodiments, the present invention also provides a stress-sensitive fracture-vug reservoir productivity determination system, which is used to perform the methods or steps in any one or more of the above embodiments. Figure 9 A schematic diagram of the structure of the fracture-cavity reservoir productivity determination system considering stress sensitivity in the present invention is shown, such as Figure 9As shown, the system includes:

[0168] Parallel model building module 91, which is used to use the single-slit-cavity physical model as the main crack-cavity system model, expand the secondary crack-cavity system model based on the main crack-cavity model, and form a main crack-cavity system model and secondary crack-cavity system model. Conceptual model of parallel seams and holes;

[0169] A permeability model building module 93, which is used to build a corresponding permeability decrease mathematical model based on the par...

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Abstract

The invention provides a fracture-vug type reservoir productivity determination method considering stress sensitivity, which comprises the following steps: expanding a secondary fracture-vug system model based on a single fracture-vug physical model to form a parallel fracture-vug conceptual model containing primary and secondary fracture-vug system models, and constructing a permeability reduction mathematical model according to the relevance between stress sensitivity and permeability, according to the relevance between the permeability and the productivity, obtaining a fracture-vug type reservoir productivity formula model considering stress sensitivity on the basis of a permeability decreasing mathematical model and a constructed basic mathematical description model, and further obtaining a curve chart of stress sensitive value change characteristics to fracture-vug type reservoir productivity change; and adjusting and fitting the curve chart by using the actual productivity curve to determine a final target reservoir productivity formula. By the adoption of the scheme, the defect that an existing fracture-vug type reservoir productivity formula is insufficient in accuracy is overcome, the stress sensitive parameters are introduced, productivity prediction can be more accurately achieved for the reservoir in the target area, and reasonable development of the fracture-vug type reservoir is guided.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, and in particular, to a method and system for determining the productivity of a fracture-cavity reservoir considering stress sensitivity. Background technique [0002] For carbonate fracture-cave reservoirs such as Shunbei, Yuejin and Tahe, the reservoir mainly consists of three parts: matrix, fractures and caves, and the reservoir is highly heterogeneous. Especially in the fracture system, with the continuous improvement of the understanding of exploration and development, the study found that the fracture system has obvious stress-sensitive effect, which has also been confirmed by a large number of laboratory experiments. Experiments show that oil and gas reservoirs containing fractures (including fractured oil and gas reservoirs, fractured-cavity oil and gas reservoirs, etc.) are stress sensitive, that is, with the continuous development of production, the pore pressure in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F111/10G06F119/14
CPCG06F30/20G06F2111/10G06F2119/14
Inventor 宋海赵海洋马国锐邹宁汪洋李丹丹龙武陶杉徐燕东李渭亮鄢宇杰张杰黄传艳
Owner CHINA PETROLEUM & CHEM CORP
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