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Method for correcting saturation of sealing coring well

A technology of airtight coring and correction methods, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve problems such as oily and low water saturation

Inactive Publication Date: 2016-11-23
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, under the current technical conditions, the sum of oil and water saturation in closed coring wells can only reach 75% to 85%, which is far lower than the theoretical value of 100%. low

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  • Method for correcting saturation of sealing coring well
  • Method for correcting saturation of sealing coring well
  • Method for correcting saturation of sealing coring well

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Embodiment Construction

[0098] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

[0099] like figure 1 as shown, figure 1 It is a flow chart of the method for calibrating the saturation of the closed coring well of the present invention. In step 101, according to the measurement report of rock porosity and permeability under the overburden pressure of Well Check A in Gudao Oilfield, Shengli Oilfield, the surface porosity of Well Check A can be obtained as Φ s with a subsurface porosity of Φ r The relationship is as follows:

[0100] φ r =0.9334φ s +0.0025,

[0101] In the formula:

[0102] Φ s — Surface porosity measurements of core samples;

[0103] Φ r —The underground overburden porosity of the core sample;

[0104] From this, the rock pore volume compressibility coefficient α can be calculated:

[0105] ...

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Abstract

The invention provides a method for calibrating the saturation of a closed coring well, comprising: step 1, based on the analysis data of the surface porosity Φs and the overburden porosity Φr measured by the core samples of the closed coring well, establishing the cause of the saturation caused by the change of the rock pores and oil-water volume The correction formula for the change of oil content and water saturation of the measured sample; step 2, establish the formula for the change of oil content and water saturation loss of the measured sample caused by degassing and draining; The mathematical correction model of saturation loss due to the change of pore volume and oil-water volume and fluid saturation loss caused by depressurization and degassing and drainage can obtain the real oil and water saturation of the underground before measuring the saturation loss of core samples. The correction method for measuring oil and water saturation of core samples from closed coring wells realizes the accurate calculation of oil and water saturation of oil layers under formation conditions, and provides important basic parameters for reservoir engineering optimization research.

Description

technical field [0001] The invention relates to the technical field of calculating the remaining oil saturation of geological oil reservoirs in petroleum development, in particular to a method for testing and correcting the oil saturation and water saturation of core samples in closed coring wells. Background technique [0002] Most oilfields in eastern my country have entered the development stage of high and ultra-high water cut periods, and the remaining oil in the oilfields is in the distribution mode of "overall distribution and local enrichment". The remaining oil saturation of the oil layer is determined, and the remaining oil is effectively developed. It is of great significance to improve the oilfield development effect. [0003] At present, the accurate and effective method to obtain the oil-water saturation of oil reservoirs is to use the core samples of sealed coring wells to analyze and test the data of oil and water saturation. However, under the current techni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G06F19/00
Inventor 李伟忠王玉环刘西雷吴光焕赵红雨牛丽娟崔卫东赵衍彬陈明铭安洁韩文杰吴兆辉孙钰
Owner CHINA PETROLEUM & CHEM CORP
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