Method for determining remaining oil of fracture and hole type oil reservoir under encirclement of high flow guide channel

A technology of diversion channel and fracture-cavity type, which is applied in the field of determining high diversion channels to trap remaining oil in fractured-cavity reservoirs, can solve the problems of time-consuming and laborious, high cost of laboratory experiments, and inability to consider the characteristics of medium structure, etc. The effect of the application foreground

Inactive Publication Date: 2015-01-21
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, the design of the simulation experiment model is difficult, the cost of the indoor experiment is high, time-consuming and labor-intensive, and there are many problems in the observation and measurement in the experiment, and it is difficult to have a clear understanding of the remaining oil trapped in the high diversion channel
The use of computer simulation can overcome these difficulties well, but the simulation method mostly uses the averaged Darcy empirical correlation formula, which cannot consider the complex structural characteristics of the medium, and it is difficult to describe the complex conductivity of the high conductivity channel, and it is impossible to determine the high conductivity. Location of residual oil trapped in flow channel

Method used

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  • Method for determining remaining oil of fracture and hole type oil reservoir under encirclement of high flow guide channel
  • Method for determining remaining oil of fracture and hole type oil reservoir under encirclement of high flow guide channel
  • Method for determining remaining oil of fracture and hole type oil reservoir under encirclement of high flow guide channel

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specific Embodiment approach

[0089] Such as Figure 20 Shown, the specific embodiment of the present invention is as follows:

[0090] (1) According to the result data such as core scanning and reservoir description, determine the boundary area of ​​the research target, the type of fracture-cavity combination, and the distribution of high conductivity channels; according to the physical experiment test method, determine the fluid density, viscosity;

[0091] (2) Establish a particle simulation mathematical model suitable for oil-water two-phase flow in fractured-cavity reservoirs. Based on the difference theory, this method obtains any macroscopic variable f(r) in the reservoir (such as density, pressure, temperature, etc.) from the weighted interpolation of a series of surrounding points, which can be obtained by formula (1).

[0092] f(r)=∫f(r')W(r-r', h)dr' (1)

[0093] Among them, W(r-r′, h) is the weight function; h is the smooth length, which is a measure of the scope of the weight function.

[...

Embodiment 1

[0179] Figure 16 It is a two-dimensional oil reservoir core scanning image, which contains a variety of complex and high conductivity channels, and it is difficult to describe its shape and boundary by conventional methods. Based on the method of the present invention, it is directly converted into a corresponding color value matrix, and solids are distinguished by color values Boundary particles and single-component or multi-component particles in the simulation system use the position in the color value matrix to configure particle information. Figure 17 It is the initial particle distribution diagram of the porous medium in the core image after discretization. The black ones represent solid particles, and the white ones represent fluid particles. This is used as the initial distribution information of the particle properties and positions during the calculation of the particle simulation method.

[0180] The particle size used in the calculation is 2048×2048, the fluid fl...

Embodiment 2

[0183] Considering the multi-scale structure of fractured-vuggy reservoirs, the actual fractured-vuggy reservoirs are simplified, and a model including fractures, vugs, fracture intersections and different fracture-vug combinations is designed. The physical size of the model is about 3.88m×1.20 m, water is injected from the upper left corner of the model, liquid is collected from the upper right corner of the model, the displacement time is about 6.93 hours, the oil viscosity is 15mPa.s, and the inlet velocity is 5×10 -5 m / s.

[0184] Such as Figure 19(a) to Figure 19(c) Shown are the distribution diagrams of oil and water at different times. It can be seen from the figure that water is rushing in along the high conductivity channels. At different fracture intersections and different fracture-cave combination modes, the fluid flow state changes significantly, and finally forms a Different forms of trapped remaining oil, with the change of displacement time, part of the remai...

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Abstract

The invention provides a method for determining remaining oil of a fracture and hole type oil reservoir under the encirclement of a high flow guide channel, and belongs to the field of oil-gas field development. The method includes the steps that first, a particle simulation model and an algorithm of the fracture and hole type oil reservoir are established, a surface tension model of the fracture and hole type oil reservoir is determined, then a numerical method is used for realizing the water-oil displacement process in different fracture and hole combined modes, and thus the remaining oil distribution condition on the microcosmic rock core dimension and the macroscopic oil reservoir dimension under the encirclement of the high flow guide channel can be judged. By the adoption of the method, the simulation effect is consistent with a physical experiment result, laboratory experiments can be replaced, and the remaining oil on the macroscopic oil reservoir dimension and the microcosmic rock core dimension under the encirclement of the high flow guide channel can be determined.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a method for determining residual oil trapped in high-conductivity channels of a fracture-cavity reservoir. Background technique [0002] The fracture-vuggy reservoir is a kind of oil and gas reservoir caused by the development of paleokarst, the fracture-cavity system is the main storage space of oil and gas, and the structural fractures and dissolution fractures are the main flow channels. Due to the highly discrete nature of such reservoirs, the original geologic reserves are also discontinuously distributed. Due to the scale differences in the type of storage space and the impact of the development process, the distribution of remaining oil is more discrete. [0003] There are many factors that affect the distribution of remaining oil in fractured-cavity reservoirs, among which high conductivity channels play an important role in controlling fluid flow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06F9/455
Inventor 张宏方吕心瑞刘中春
Owner CHINA PETROLEUM & CHEM CORP
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