Flooded-layer well-logging quantitative evaluation method

A quantitative evaluation and well logging technology, applied in earthwork drilling and production, wellbore/well parts, etc., can solve the problems of difficult evaluation of water-flooded layers, measurement, cumbersome process, etc., and achieve simple, practical and accurate evaluation High, simple process effect

Active Publication Date: 2015-08-19
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

However, due to the relatively high cost and cumbersome process of carrying out petrophysical experiments in sealed coring, all or some of the above parameters cannot be measured by petrophysical experiments one by one, and it is very difficult to use the above methods to evaluate water-flooded formations

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  • Flooded-layer well-logging quantitative evaluation method
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  • Flooded-layer well-logging quantitative evaluation method

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0036] A kind of logging quantitative evaluation method of water-flooded layer of the present invention comprises the following steps:

[0037] 1) Carry out unsealed coring at a certain depth of the oilfield, and conduct petrophysical experiments on the obtained cores to obtain the capillary pressure curve and effective porosity at this depth Effective permeability K, Archie parameters a, b, m, n and formation water resistivity R w .

[0038] 2) Based on capillary pressure curve and effective porosity Effective permeability K, establish J function:

[0039]

[0040] In the formula, P c is the capillary force, the unit is MPa; ρ is the density of oil, about 0.80g / cm 3 ; g is the acceleration of gravity, about 9.81m / s 2 ; H is the depth of the core, that is, the depth of the formation where the core is located, in m; H 0 is the oil-water int...

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Abstract

The invention relates to a flooded-layer well-logging quantitative evaluation method which comprises the following steps: 1), carrying out non-sealed coring on a stratum section a certain depth below an oil field, and carrying out a rock physical experiment so as to obtain related experiment parameters; 2), on the basis of a capillary pipe pressure curve, effective porosity and effective permeability obtained in the step 1), establishing a J function; 3), calculating the relationship between initial oil saturation and the J function; 4), measuring the whole stratum section of the oil field through a well logging instrument, so as to obtain related experiment parameters; 5), calculating on the basis of the effective permeability and the effective porosity so as to obtain the relationship between the J function in the whole stratum section and the initial oil saturation; 6), calculating on the basis of the rock resistivity and the effective porosity so as to obtain the oil saturation of the whole stratum section during well logging; and 7), according to the distribution range of the difference value of saturation, determining whether the oil layer is flooded or not and the flooding grade. The flooded-layer well-logging quantitative evaluation method is high in accuracy, high in popularity and good in economy and can be widely applied to quantitative evaluation of various types of flooded layers.

Description

technical field [0001] The invention relates to a water-flooded layer evaluation method, in particular to a water-flooded layer logging quantitative evaluation method. Background technique [0002] During the development of oilfields, due to formation water advancement or water injection development, the reservoir will be flooded to varying degrees, which will lead to various changes in the properties of the reservoir. In order to find the remaining oil accurately and improve the development benefit of the oil field, the logging evaluation of the water-flooded layer is an indispensable work and has very important significance. In general, the logging evaluation method for water-flooded formations is as follows: firstly, a large number of rich petrophysical experiments are carried out on the cores obtained from sealing; Finally, combined with the response characteristics of conventional well logging curves, the qualitative, semi-quantitative or quantitative evaluation of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/00E21B49/001
Inventor 李雄炎李绪宣秦瑞宝高云峰范洪军刘小梅魏丹平海涛
Owner CHINA NAT OFFSHORE OIL CORP
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