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A visual measurement method for oilfield downhole water holdup

A measurement method and water holdup technology, applied in the field of measurement, can solve the problems of affecting the measurement accuracy, difficult to adapt, and low sensitivity, and achieve the effect of improving the measurement accuracy and eliminating the influence.

Inactive Publication Date: 2017-03-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Capacitive water holdup measuring instrument, this measuring instrument is only suitable for measuring oil wells with low water holdup. , High water cut oil well;
[0005] (2) Microwave water holdup measuring instrument, its principle is to use the resonance state of high-frequency electromagnetic waves to measure the moisture in crude oil, but it is affected by parameters such as oil film, sand production, wax deposition, heavy oil, and slippage speed. Poor repeatability, stability, consistency and standardization, making it difficult to popularize and apply;
[0008] The above-mentioned water holdup measuring instrument can only measure the average water holdup of a single point or measurement space, while the oil-water mixed water holdup measurement belongs to the measurement of gas-liquid two-phase flow, and the change of flow pattern will affect the measurement accuracy. Therefore, the existing water holdup None of the measuring instruments can guarantee the measurement accuracy of oil-water mixed water holdup

Method used

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  • A visual measurement method for oilfield downhole water holdup
  • A visual measurement method for oilfield downhole water holdup
  • A visual measurement method for oilfield downhole water holdup

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Embodiment Construction

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0041] The present invention comprises the following steps:

[0042] (1) Measure the voltage between adjacent electrodes;

[0043] (2) ERT image reconstruction algorithm is used for calculation;

[0044] (3) Reconstruct the conductivity distribution image of the oil-water mixing section;

[0045] (4) Calculate the water holdup based on the reconstructed image.

[0046] In step (3) above:

[0047] ERT is essentially the analysis and inversion of the electromagnetic field. It studies an electric field with special boundary conditions. For image 3 The sensitive field of the sensor shown can be described by formula (1):

[0048] (1)

[0049] In the formula, is the conductivity distribution in the field, is the potential distribution function in the field.

[0050] Its boundary conditions are:

[0051] (2)

[0052] In the formul...

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Abstract

The invention relates to a visualization measurement method for the specific retention under an oil field well. The visualization measurement method includes the steps of distributing an ERT sensor array at the position of the oil-water mixed cross section under the well to be measured, measuring a voltage across adjacent electrodes in the ERT sensor array, then obtaining an under-well oil-water distribution real-time image according to the ERT image rebuilt algorithm, and finally calculating the specific retention of the layer according to the image. According to the visualization measurement method, the electrical resistance tomography is adopted for achieving visualization measurement on the specific retention under the oil field well, influences of oil-water two-phase flow flow-type changes on the measurement accuracy are eliminated, the measurement accuracy of the specific retention of an oil-water mixture is greatly improved, and the visualization measurement method is particularly suitable for measurement on the specific retention under the high-water-content oil field well.

Description

technical field [0001] The invention relates to an electric resistance tomography (ERT) technology-based method for visually measuring oilfield water cut, which belongs to the field of measurement technology. Background technique [0002] The fluids produced in petroleum production have different water cut ratios. For oil fields that have entered the medium and high water cut development period, in order to reduce water and increase oil production, and rationally arrange the recovery of different oil layers, it is necessary to accurately measure the water content of different layers in the downhole. water holding rate. [0003] Common water holdup measuring instruments are as follows: [0004] (1) Capacitive water holdup measuring instrument, this measuring instrument is only suitable for measuring oil wells with low water holdup. , High water cut oil well; [0005] (2) Microwave water holdup measuring instrument, its principle is to use the resonance state of high-freque...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/18
CPCY02A90/30
Inventor 张立峰
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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