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Quantitative evaluation method of water production rate of low permeability reservoir

A technology for quantitative evaluation of low-permeability reservoirs, applied in the field of quantitative evaluation of water production rate of low-permeability reservoirs, can solve problems such as differences in flow laws, achieve strong economy, save costs, and ensure accuracy

Inactive Publication Date: 2014-06-18
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

However, for low-permeability reservoirs with narrow pore space, very small throats and poor pore connectivity (the main range of reservoir permeability distribution is less than 1mD), due to the existence of threshold pressure gradient and strong stress sensitivity, fluids in low-permeability The flow law in the reservoir is quite different from that of medium and high permeability reservoirs

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  • Quantitative evaluation method of water production rate of low permeability reservoir
  • Quantitative evaluation method of water production rate of low permeability reservoir
  • Quantitative evaluation method of water production rate of low permeability reservoir

Examples

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specific Embodiment

[0042] The following is a specific example: Quantitative evaluation of the water production rate of a certain low-permeability oil field to be developed.

[0043] First establish the water production rate F of the low-permeability reservoir w and water saturation S w The relationship between:

[0044] F w = 1 e + f × exp ( - ( S w - g ) )

[0045] Through core experiments, the Archie parameters of the oilfield were obtained: a=9.75, m=0.87, b=1.19, n=1.61, formation water resistivity R w =0.11Ω·m, and if figure 1 F shown w -S w relationship; identify the coefficients e, f and...

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Abstract

The invention relates to a quantitative evaluation method of a water production rate of a low permeability reservoir. The quantitative evaluation method comprises the following steps of 1) establishing the relation between a water production rate Fw and water saturation Sw of the low permeability reservoir, that is, selecting a nerve cell nonlinear function Sigmoid to express the relation between the water production rate Fw and the water saturation Sw; 2) drilling a core of a low permeability oil field to be developed under one depth, and carrying out a core experiment on the core so as to obtain Fw-Sw relation, formation water resistivity Rw and Archie parameters a, b, m and n; identifying coefficients e, f and g in the relation between the water production rate Fw and the water saturation Sw in the step 1) according to the Fw-Sw relation obtained in the experiment so as to determine a specific Fw-Sw function expression; 3) measuring by utilizing a logging instrument so as to obtain rock resistivity Rt and effective porosity phie of the whole stratum segment of the low permeability oil field, and further figuring out the water saturation Sw of the whole stratum segment; 4) figuring up the water production rate Fw of the whole stratum segment according to the Fw-Sw function expression obtained in the step 2) and the water saturation Sw of the whole stratum segment obtained in the step 3).

Description

technical field [0001] The invention relates to a quantitative evaluation method in the field of petroleum development, in particular to a quantitative evaluation method for water production rate of low-permeability reservoirs. Background technique [0002] Reservoir water production rate can accurately divide the water-flooded level of oil layers, which plays a vital role in the accurate evaluation of oilfield reserves and production. The dynamic law of fluid produced in the reservoir is mainly subject to the distribution and seepage characteristics of multiphase fluid in the microscopic pores of porous media, that is, Darcy's law. For the oil-water co-infiltration system, the water production rate F of the reservoir w It can be approximated as: [0003] F w = Q w Q o + Q ...

Claims

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Application Information

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IPC IPC(8): E21B49/00
Inventor 李雄炎秦瑞宝刘春成蔡露露李欣
Owner CHINA NAT OFFSHORE OIL CORP
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