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Method and system for determining limit of permeability of unfilled caverns in fractured-vuggy reservoirs

A permeability, fracture-cavity technology, applied in the field of geological exploration, can solve the problems of inability to meet the application requirements of the mine, slow operation speed, limited scale, etc. Effect

Active Publication Date: 2019-03-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When carrying out the numerical simulation of the actual unit of the fractured-vuggy reservoir, if the value of the cave is assigned according to this value, the model convergence will be poor during the simulation calculation process, and the calculation speed will be slow, resulting in a limited scale that can be simulated by the existing numerical simulator, which cannot meet the application requirements of the mine

Method used

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  • Method and system for determining limit of permeability of unfilled caverns in fractured-vuggy reservoirs
  • Method and system for determining limit of permeability of unfilled caverns in fractured-vuggy reservoirs
  • Method and system for determining limit of permeability of unfilled caverns in fractured-vuggy reservoirs

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Embodiment approach 1

[0032] figure 1 A flow chart of a method for determining the permeability limit of unfilled caves in a fractured-cavity reservoir according to an embodiment of the present invention is shown. figure 2 A schematic diagram of rapid separation of oil phase and water phase according to one embodiment of the present invention is shown. image 3 The relationship curve of seepage velocity and reservoir permeability according to one embodiment of the present invention is shown. Figure 4 It shows a graph of pseudo-permeability values ​​of unfilled caves according to an embodiment of the present invention.

[0033] Such as Figure 1-Figure 4 As shown, in this embodiment, the method for determining the permeability limit of an unfilled cave in a fractured-cavity reservoir according to the present invention includes: obtaining the seepage velocity based on the density of crude oil, the density of water and the viscosity of crude oil;

[0034] Obtaining the flow scale based on the oil...

Embodiment approach 2

[0052] In this embodiment, the system for determining the permeability limit of unfilled caves in fractured-cavity reservoirs according to the present invention includes:

[0053] a memory storing computer-executable instructions;

[0054] a processor, the processor runs the computer-executable instructions in the memory, and performs the following steps:

[0055] Obtain seepage velocity based on crude oil density, water density and crude oil viscosity;

[0056] Obtaining the flow scale based on the oil-water separation achieved on the longitudinal grid scale and the seepage velocity within a reporting step time;

[0057] The flow scale is equivalent to the vertical scale of the grid, and the chart of the relationship between the permeability limit of the cave and the vertical grid step is obtained.

[0058] In one example, the specific formula for obtaining seepage velocity is:

[0059]

[0060]

[0061] In an example, the oil-water separation and the seepage velocit...

Embodiment

[0067] Figure 5 A schematic diagram of the distribution of reservoirs near Well W is shown according to an embodiment of the present invention. Image 6 A schematic diagram of the distribution of permeability properties of unfilled caves according to an embodiment of the present invention is shown. Figure 7 A schematic diagram of water saturation distribution of an unfilled cave according to an embodiment of the present invention is shown. Figure 8 A schematic diagram of a water cut fitting curve of well W according to an embodiment of the present invention is shown.

[0068] Such as Figure 5-Figure 8 As shown, taking a single well model of a fractured-cavity reservoir as an example, the model size is 31×39×70, the total number of grids is 84,000, the grid steps in the X and Y directions are both 20 m, and the grid steps in the Z direction are 3m ~ 5m. Well W is located at the intersection of faults, with well-developed karst caves, and the production interval is a kar...

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Abstract

A method and system for determining the limit of the permeability of unfilled caverns in fractured-vuggy reservoirs are disclosed. The method includes obtaining seepage speed based on the crude oil density, the water density and the crude oil viscosity; achieving oil-water separation and the seepage speed on a longitudinal grid scale with the time of a report step to obtain a flow scale; making the flow scale equivalent to a grid longitudinal scale to obtain a cave permeability limit and longitudinal grid step size relationship map. According to the method, the Darcy seepage theory is utilizedto determine the lower limit of the permeability of the unfilled caverns to provide a basis for 3D geological modeling and numerical simulation of the fractured-vuggy reservoirs.

Description

technical field [0001] The invention belongs to the field of geological exploration, and more specifically relates to a method and system for determining the permeability limit of unfilled caves in fracture-cavity reservoirs. Background technique [0002] In the numerical model of fracture-cavity reservoirs, permeability is one of the most important attribute parameters to characterize the reservoir. Among them, the permeability of unfilled caves cannot be quantitatively evaluated by logging data, and the correlation between conventional porosity and permeability is not suitable for assignment, so it is difficult to determine the permeability, which restricts the numerical simulation research of fracture-cavity reservoirs. [0003] Fluid flow in unfilled caves is different from seepage in porous media, and has infinite conductivity characteristics, so its permeability should be infinite, and the permeability should be assigned a maximum value when modeling attributes. Howev...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B47/10
CPCE21B47/10E21B49/00
Inventor 马翠玉宋传真秦学杰刘传喜
Owner CHINA PETROLEUM & CHEM CORP
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