Method for measuring multi-phase flow

A measurement method and multi-phase flow technology, which is applied in the field of oil and gas production, can solve the problems that the multi-phase flow signal cannot be separated from oil and gas signals, and the content cannot be determined.

Active Publication Date: 2011-02-02
CHENGDU ZHONGYOU YILONG TECH CO LTD
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Problems solved by technology

[0002] In recent years, 60-70% of oil wells in some super-large oil fields in China have been degassed (that is, oil and gas are separated as the reservoir pressure decreases), that is, three-phase flow of oil, gas and water appears, so multiphase flow measurement is urgently needed method, and multiphase flow measurement is currently a blank both at home and abroad. A few years ago, some people in China applied for a utility model patent for ultrasonic three-phase flow measurement, but after 3-4 years of conversion experiments, it was finally not realized. The main reason for downhole testing of multiple (i.e. two-phase flow and three-phase flow) flows is that the signals of oil and gas in the multiphase flow signals cannot be separated, and the respective contents cannot be determined.

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[0017] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0018] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features. Such as figure 1 In the schematic diagram of downhole measurement shown, the flowmeter 101 is located in the center of the wellbore 103 , and the probe of the flowmeter 101 is facing the fluid 102 to be measured. When oil, gas, and water in the downhole fluid to be tested flow in bubbles in the casing, the oil bubbles and air bubbles have different slippage velocities against the water, that is, the oil bubbles and air bubbles flow upward relat...

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Abstract

The invention discloses a method for measuring multi-phase flow. The method comprises the following steps of: 1, converting a measured time-domain signal to obtain a oil-gas-water three phase power spectrum; 2, separating oil water and gas water, fitting the oil-gas-water three-phase power spectrum by using the curve characteristics of a two-phase flow power spectrum so as to acquire corresponding oil-water power spectrum and a gas-water power spectrum; and 3, obtaining the actual flow rate according to the relationship of demarcated power spectrum integral area-flow rate or / and power spectrum center frequency-flow rate. Curve fit is adopted for separation, so the problem of separating oil, water and gas can be well solved, and the defects disturbing the measurement of the multi-phase flow for a long term are overcome. Multiple test measurement proves that the measurement error of two-phase flow is 5 to 10 percent, the error for three-phase flow is about 15 percent, and production requirement can be completely met.

Description

technical field [0001] The invention relates to the technical field of oil and gas production, in particular to a method for measuring oil-water-gas multiphase flow. Background technique [0002] In recent years, 60-70% of oil wells in some super-large oil fields in China have been degassed (that is, oil and gas are separated as the reservoir pressure decreases), that is, three-phase flow of oil, gas and water appears, so multiphase flow measurement is urgently needed method, and multiphase flow measurement is currently a blank both at home and abroad. A few years ago, some people in China applied for a utility model patent for ultrasonic three-phase flow measurement, but after 3-4 years of conversion experiments, it was finally not realized. The most important reason for the downhole testing of multi-phase flow (namely two-phase flow and three-phase flow) is that the signals of oil and gas in the multiphase flow signals cannot be separated, and the respective contents canno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/66E21B47/00
Inventor 周国隆
Owner CHENGDU ZHONGYOU YILONG TECH CO LTD
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