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Horizontal well specific retention measuring method based on minimum root-mean-square error

A technology of root mean square error and measurement method, applied in the field of multiphase flow detection, can solve the problem of low water holdup measurement accuracy

Active Publication Date: 2016-09-28
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the azimuth angle of the probe array placed downhole is unknown, the measurement accuracy of water holdup is low

Method used

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  • Horizontal well specific retention measuring method based on minimum root-mean-square error
  • Horizontal well specific retention measuring method based on minimum root-mean-square error
  • Horizontal well specific retention measuring method based on minimum root-mean-square error

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] The method proposed in this example is verified experimentally in the horizontal well simulation experimental device of the Well Logging and Well Testing Testing Experimental Center of Daqing Petroleum Testing Service Branch. The oil used in the experiment is diesel oil, the water used in the experiment is tap water, and the total flow rate of oil-water two-phase flow varies from 10 to 200m 3 / d, the range of moisture content is 0-100%. The inner diameter D of the horizontal well is 125mm, and the radius of the inner and outer rings of the double-ring conductivity probe array is r 1 and r 2 34mm and 48mm respectively.

[0031] A method for measuring water holdup of horizontal wells based on minimum root mean square error, characterized in that the steps are as follows:

[0032] The first step is to establish the mathematical relationship from the height of the oil-water contact to the water holdup of the horizontal well, namely

[0033] β = ...

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Abstract

The invention belongs to the technical field of multiphase flow detection, and provides a horizontal well specific retention measuring method based on the minimum root-mean-square error. Firstly, the mathematic relation between the horizontal well oil interface height and the horizontal well specific retention is established; afterwards, a mathematical relationship between the conducting probe height and the probe array azimuth angle is obtained according to the structure of a probe array; and then, according to the number of conducting probes immersed in water, corresponding upper and lower specific retention limits are determined, and the optimal value of the specific retention is estimated. Experiment results show that the method is feasible and effective, the specific retention of a horizontal well can be quickly calculated out according to the response of the probe array, high measuring precision can be achieved, and the method is suitable for practical engineering application.

Description

【Technical field】 [0001] The invention belongs to the technical field of multiphase flow detection. Aiming at medium and low fluid production horizontal wells, a method for measuring water holdup of horizontal wells based on the minimum root mean square error (Root mean square error, RMSE) is proposed in combination with a double-ring conductivity probe array. The reliability and accuracy of water holdup measurement of oil-water two-phase flow in horizontal wells are improved. 【Background technique】 [0002] Water holdup refers to the percentage of water phase area in the measured profile, and is an important multiphase flow parameter in production profile logging. Lumped capacitive sensors and lumped impedance sensors can effectively measure the water holdup / water cut of oil-water two-phase flow in vertical wells, but the stratified flow of oil-water two-phase flow in horizontal wells makes it impossible for lumped sensors to measure accurately Water holdup of oil-water tw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/08
CPCE21B49/08E21B49/0875
Inventor 徐立军曹章张文赵嘉宇
Owner BEIHANG UNIV