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A method and a system for rapidly analyzing the remaining oil of a fracture-cavity type reservoir

A fracture-cavity, residual oil technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as ill-conditioned linear equations, time-consuming, and affecting convergence speed

Active Publication Date: 2019-03-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] Using existing technology to analyze and study fractured-vuggy reservoirs, the linear equations in numerical simulation analysis are extremely ill-conditioned, which affects its convergence speed, resulting in low efficiency and long time-consuming analysis of the entire analysis, which seriously restricts fractured-vuggy reservoirs Determination of remaining oil and forecast of plan

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  • A method and a system for rapidly analyzing the remaining oil of a fracture-cavity type reservoir
  • A method and a system for rapidly analyzing the remaining oil of a fracture-cavity type reservoir
  • A method and a system for rapidly analyzing the remaining oil of a fracture-cavity type reservoir

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[0070] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the implementation process of how to apply technical means to solve technical problems and achieve corresponding technical effects in the present invention. The embodiments of the present application and the various features in the embodiments can be combined with each other under the premise of no conflict, and the formed technical solutions are all within the protection scope of the present invention.

[0071] Reservoir numerical simulation analysis is one of the key technologies of oilfield development, and it is an important tool for studying the distribution of remaining oil and formulating development plans.

[0072] The reservoir space of carbonate fracture-cavity reservoirs is a collection of various void types such as (large dissolved caves, large fractures), dissolved pore zones, fractu...

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Abstract

The invention discloses a method and a system for rapidly analyzing the remaining oil of a fracture-vuggy type reservoir, which comprises the following steps of: establishing a mathematical model of the fracture-cavity type reservoir; dividing fractured-vuggy reservoir into grid units and numerical model is established based on mathematical model. The numerical model is solved iteratively and theremaining oil is analyzed according to the distribution of fluid pressure and saturation used to describe fractured-vuggy reservoir. In each iterative step of solving the numerical model, the pressureequation of oil phase is extracted from the numerical model based on the characteristics of the grid element; Processing the oil phase pressure equation based on an algebraic multigrid algorithm to obtain a first pressure value; a first pressure value is used as an initial solution when iterating the numerical model. By using this method, the remaining oil in fractured-vuggy reservoir can be analyzed quickly and effectively.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, in particular to a method and system for quickly analyzing remaining oil in fracture-cavity reservoirs. Background technique [0002] Reservoir numerical simulation analysis is one of the key technologies of oilfield development, and it is an important tool for studying the distribution of remaining oil and formulating development plans. The current technology can show the advantage of faster convergence speed for homogeneous reservoirs. However, the reservoir space of fractured-vuggy carbonate rock reservoirs is composed of (large dissolved caves, large fractures), dissolved pore zones, fractured zones, (small dissolved pores, micro fractures) and other types of voids. It is complex and has the characteristics of uneven permeability and strong heterogeneity. [0003] Using existing technology to analyze and study fractured-vuggy reservoirs, the linear equations in numerical simulat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2111/10
Inventor 康志江张允张冬丽赵艳艳芮洪兴
Owner CHINA PETROLEUM & CHEM CORP
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