Method and system for oil reservoir numerical simulation

A numerical simulation and oil reservoir technology, applied in the field of oil reservoirs, can solve problems such as inaccurate simulation results and inability to take into account near-well conditions, and achieve the effect of fewer grids and less computation.

Active Publication Date: 2017-09-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing reservoir numerical simulation technology, due to the limitation of computing power, cannot take into account the complex near-well conditions, so the simulation results are not accurate

Method used

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  • Method and system for oil reservoir numerical simulation
  • Method and system for oil reservoir numerical simulation
  • Method and system for oil reservoir numerical simulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Such as figure 1 As shown, the reservoir numerical simulation methods include:

[0061] Step 11: Determine the primary near-well area based on the near-well effect occurrence area, where the near-well effect occurrence area includes at least one of the wellbore, fracturing fractures, and formation contamination zone. The formation contamination zone is due to completion methods or stimulation measures The pollution zone caused by the formation;

[0062] Step 12: According to the wellbore diameter and the seepage equation when the wellbore production reaches a steady state, determine the pressure equipotential line in the primary near-well area. In this embodiment, the seepage equation is a single-phase incompressible fluid equation;

[0063] Step 13: Determine the final near-well area according to the pressure equipotential lines;

[0064] Step 14: Establish a coarse mesh model of the final near-well area according to the pressure equipotential lines in the final near-well area...

Embodiment 2

[0076] Such as image 3 As shown, the reservoir numerical simulation system of the present invention includes:

[0077] The preliminary near-well area determination module 21 is used to determine the preliminary near-well area based on the near-well effect occurrence area, where the near-well effect occurrence area includes: at least one of the wellbore, fracturing fractures, and formation contamination zone, formation contamination zone It is a zone of formation contamination caused by well completion methods or stimulation measures;

[0078] The pressure equipotential line determination module 22 is used to determine the pressure equipotential line in the primary near-well area according to the diameter of the wellbore and the seepage equation when the wellbore production reaches a steady state;

[0079] The final near-well area determination module 23 is used to determine the final near-well area according to the pressure equipotential lines;

[0080] The near-well coarse grid mode...

Embodiment 3

[0091] Embodiment 3: The reservoir numerical simulation method includes:

[0092] (1) Determine the primary near-well area based on the near-well effect occurrence area:

[0093] Such as Figure 5 As shown, the research object of this embodiment is a vertical wellbore 51 with fracturing fractures 52 in the reservoir. The range of the primary near-well area 54 should be larger than the range of the near-well effect occurrence area 53, that is, the initial The selected near-well area 54 should surround the near-well effect occurrence area 53, so that the subsequent steps will not affect the flow in the near-well area in the calculation of the fine grid. The actual model is a three-dimensional model. To facilitate understanding, the schematic diagram is drawn as a simple two-dimensional conceptual model in this embodiment. Figure 5 Shown is a top view.

[0094] (2) According to the diameter of the wellbore, construct a fine mesh model of the primary near-well area:

[0095] The TetGen ...

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Abstract

The invention discloses a method for oil reservoir numerical simulation. The method comprises the steps that an initially selected near-well area is determined according to a near-well effect occurrence area; pressure equipotential lines in the initially selected near-well area are determined according to a well shaft diameter and a seepage equation generated when well shaft production reaches a stable state; a final near-well area is determined according to each pressure equipotential line; according to the pressure equipotential lines inside the final near-well area, a near-well coarse mesh model of the final near-well area is established; a far-well area model is established for an oil reservoir area outside the final near-well area; and a seepage model concerning oil reservoir values is determined according to the near-well coarse mesh model and the far-well area model, so that pressure distribution and yield of the oil reservoir area can be predicted. According to the invention, the initially selected near-well area is firstly determined according to the near-well effect occurrence area; then, the final near-well area is determined according to the pressure equipotential lines in the initially selected near-well area. In this way, the near-well coarse mesh model of the final near-well area can accurately simulate influences of near-well effects; the quantity of meshes is small; and the computation amount is small.

Description

Technical field [0001] The invention relates to the field of oil reservoirs, in particular to a method and system for numerical simulation of oil reservoirs. Background technique [0002] In the reservoir numerical simulation, the heterogeneity of the near-well area and the perforation and fracturing have a great influence on the simulation accuracy. Existing reservoir numerical simulation technology cannot take into account the complex near-well conditions due to the limitation of computing power, so the simulation results are not accurate. [0003] Therefore, how to provide a reservoir numerical simulation method and system with a small amount of calculation and high simulation accuracy has become a technical problem to be solved by those skilled in the art. Summary of the invention [0004] The purpose of the present invention is to provide a numerical simulation method for oil reservoirs, which has a small amount of calculation and high simulation accuracy. [0005] In order to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 黄朝琴梁梦吟姚军黄涛
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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