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Fracture-matrix permeability differential judgment method for carbonate reservoir equivalent model

A carbonate reservoir and matrix permeability technology, which is applied in permeability/surface area analysis, suspension and porous material analysis, measurement devices, etc., can solve problems affecting the accuracy of development indicators, and the development plan is scientific and has no permeability Problems such as level difference discrimination standard and low precision of production history fitting can be avoided to avoid selection and debugging time, reduce calculation workload, and greatly change pressure distribution.

Active Publication Date: 2012-06-20
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When selecting the equivalent medium numerical simulation model of carbonate oil and gas reservoirs in the existing technology, it is often selected artificially based on experience, and there is no scientific criterion for judging the permeability difference. Affect the accuracy of development index prediction and the scientificity of development plan

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Aiming at the single-phase flow and multi-phase flow under different fracture-matrix permeability gradients, the mechanism model under the conditions of depletion production and horizontal well injection-production well pattern production is studied.

[0028] Basic information of the dual-porosity and dual-permeability model: grid number 20×20×10, grid size: 164ft×164ft×32ft. Matrix porosity 0.2, matrix permeability 0.35×10 -3 mm 2 . The fracture porosity is 0.002, and the fracture permeability is determined according to the permeability difference between the fracture and the matrix. Crude oil density 0.8284g / cm 3 , the original saturation pressure is 1685psi, and the original dissolved gas-oil ratio is 0.358Mscf / stb.

[0029] Investigate the production and recovery degree among various models under different permeability gradient conditions to compare the differences among various models. The characteristics of various models: (1) The dual-porosity dual-permeabil...

Embodiment 2

[0031] Equivalent mechanism under the condition of single well depletion production:

[0032] For single-well depletion production, no matter under the condition of single-phase flow or oil-gas two-phase flow, if the fracture-matrix permeability difference reaches more than 15 times, the difference between the dual-porosity dual-permeability model and the dual-porosity single-permeability model is already very large. Small, the two can be equivalent at this time.

[0033]For single well depletion production, under the condition of oil-gas two-phase flow, if the fracture-matrix permeability difference is less than 3 to 5 times, the difference between the dual-porosity and dual-permeability model and the equivalent matrix single-medium model is already very small. Both can be equivalent. For the case of single-phase flow, the standard of 3-5 times the permeability difference can better meet the requirements.

[0034] For single-well depletion production, under the condition of...

Embodiment 3

[0037] Equivalent mechanism under well pattern depletion mining conditions:

[0038] Under the condition of well pattern depletion mining, the permeability differential standard of the equivalent double-hole single-permeability model is the same as that of single-well depletion mining, and a differential standard of 15 times can be selected. The permeability difference standard of the equivalent fracture single medium model is lower than that of single well depletion production, and the permeability difference is lower than 500 times. The difference between them is very small and can be equivalent. Therefore, the 500 times permeability differential standard determined by single well depletion production can better meet the requirements. The permeability differential standard of the equivalent matrix single medium model is the same as that of single well depletion production, and a differential standard of 3 to 5 times can be selected.

[0039] The mechanism research results ...

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Abstract

The invention discloses a fracture-matrix permeability differential judgment method for a carbonate reservoir equivalent model. The fracture-matrix permeability differential judgment method comprises equivalent fracture single medium value simulated fracture-matrix permeability differential judgment, equivalent matrix single medium value simulated fracture-matrix permeability differential judgment, and equivalent double-porosity and single-permeability value simulated fracture-matrix permeability differential judgment. By the method, the historical matching and project forecast of various carbonate reservoirs with diversified reservoir stratums, complicated fracture and matrix matching relationships, large change of permeability differential, complicated oil gas and water relationships, large change of pressure distribution, large simulation blocks, complicated production histories and the like can be quickly realized.

Description

Technical field [0001] The present invention involves a crack-matrix penetration rate difference method of carbonate rocky oil gas hidden equivalent, which is the field of oil mining technology. Background technique [0002] The conventional numerical simulation method is mainly applicable to the simple oil and gas collection of the structure, reservoir medium, and the fluid distribution.The reservoir of the carbonate rocky gas collection is usually composed of cracks (holes) and matrix pores. The reservoir medium and fluid distribution are very complicated.Theoretically, the use of a dual -hole and dual osmotic medium osmotic model is the best choice to describe carbonate rock reservoirs.When the penetration rate between the cracks and the matrix is moderate and the number of grids is small, the dual -hole and dual penetration model can successfully achieve the history of oil and gas collection, but for a large number of reality, the carbonate rock gas collection of complex medi...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 王自明袁迎中严文德
Owner BC P INC CHINA NAT PETROLEUM CORP
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