Crude oil gas fraction and moisture percentage dual energy gamma ray measurement method

A measurement method, γ-ray technology, applied in the direction of measurement devices, X-ray equipment, electrical components, etc., can solve the principles that affect the method used and measurement accuracy, the physical meaning is not clear, and the gas content and water content of crude oil have not been found and device issues

Inactive Publication Date: 2008-09-10
罗平安 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In any case, there are too many approximations in this theoretical model, the physical meaning of each parameter is not clear, and the influence of changing parameters such as pressure and temperature has not been considered for correction, which ultimately affects the method used and measurement accuracy.
[0006] At present, the principle and device for measuring gas content and water content in crude oil by dual energy gamma ray method have not been found in the market

Method used

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  • Crude oil gas fraction and moisture percentage dual energy gamma ray measurement method
  • Crude oil gas fraction and moisture percentage dual energy gamma ray measurement method
  • Crude oil gas fraction and moisture percentage dual energy gamma ray measurement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Example 1: The working principle of the measurement system with two radioactive sources and detectors installed horizontally

[0077] The installation position of the core components of the measuring device 1 is as follows: figure 1 shown.

[0078] The feature of this embodiment is that two gamma ray radiation sources are used to generate high and low energy gamma rays. The high-energy gamma-ray source 2, collimator 3, detector 4 and shielding tube 5 form a set of high-energy gamma-ray detection pathways, and the low-energy gamma-ray radiation source 6, collimator 7, detector 8 and shielding tube 9 to form a set of low-energy gamma-ray detection pathways. The two sets of detection passages are on the same cross section of the crude oil pipeline 10, which reduces the length of the measuring device 1. Notice figure 1 The included angle of the two sets of detection paths shown in , does not necessarily require 90°, as long as the test components can be completely insta...

Embodiment 2

[0082] Example 2: The working principle of the measurement system with two radioactive sources and detectors installed vertically

[0083] The installation position of the core components of the measuring device 1 is as follows: figure 2 shown.

[0084] The characteristic of this application example is that two radiation sources are used to generate high and low energy gamma rays. The radioactive source 2, collimator 3, detector 4 and shielding tube 5 that generate high-energy γ-rays form a set of high-energy γ-ray detection channels, and the radioactive source 6, collimator 7, and detector 8 that generate low-energy γ-rays similarly and the shielding tube 9 form a set of low-energy gamma-ray detection passages. The closer the two sets of detection paths are, the more it can meet the theoretical ideal requirement that high and low energy gamma rays can hit the same position of the medium at the same time. In practice, its parameters can be adjusted according to the uniform...

Embodiment 3

[0088] Example 3: The working principle of the measurement system with two radioactive sources placed side by side

[0089] The installation position of the core components of the measuring device 1 is as follows: image 3 shown.

[0090] The characteristic of this application example is that two γ-ray radiation sources 2 and 6 are placed side by side at the position facing the exit of the collimator 3, so that high and low γ-rays are emitted from the exit of the collimator 3 at random. Use the energy spectrum analysis function of the special software to mark the energy intervals of high-energy and low-energy γ-rays, record the counts of high-energy and low-energy γ-rays, and use them as high-energy and low-energy channel data.

[0091] The high-energy and low-energy gamma rays emitted by the radioactive sources 2 and 6 respectively pass through the collimator 3 at random but not at the same time, irradiate the medium in the crude oil pipeline 10 , and are converted into elec...

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Abstract

The invention relates to a dual energy Gamma ray measuring method for gas ratio and water ratio in crude oil. The method uses the Gamma ray produced by a radiation source together with the principle of material interaction to measure the indexes of gas ratio and water ratio in oil pipelines under the condition of a three-phase medium, such as oil, water and gas in oilfield production. The measuring equipment consists of three big subsystems as well as a set of special software, concretely consisting of a dual Gamma ray radiation source producing dual energy Gamma rays, a detector subsystem, a general control and data processing subsystem, and a collimator as well. The dual energy Gamma ray measuring system uses the comparatively perfect established physical model to improve measuring accuracy of the measuring system so the system is suitable for the measuring system of automatic online in oilfield production. The system has the advantages that the theoretical model has higher accuracy, physical significance of various parameters is comparably clear, the usage is simple, and the factors such as temperature, pressure, etc., are considered. When the radiation source of the dual energy Gamma ray is utilized, high measuring accuracy is guaranteed, and simultaneously, the device of the system is simplified, and the reliability of the measuring system is improved, thus having specially important significance in measuring and calculating the crude oil output.

Description

technical field [0001] The invention relates to the technical field of petroleum measurement, in particular to a dual-energy γ-ray measurement technology, that is, to use the principle of the interaction between γ-rays generated by a radioactive source and matter to measure oil-water-gas three-phase media in oil field production. Moisture content and gas content indicators. Especially suitable for automatic online metering system in oilfield production. Background technique [0002] As one of the most important energy sources, crude oil extracted from oil wells is a mixture of multiphase media such as oil, water, and natural gas. To process this mixture, gas-liquid separation is required first, and the remaining oil-water mixed liquid is dehydrated to obtain refined oil with a very low water content for export or sale. In a series of production activities such as crude oil dehydration treatment, it is necessary to timely and accurately grasp the water content and gas conte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/087G06F19/00H05G1/30
CPCG01N23/12G01N33/2847G01N33/2841
Inventor 罗平安房宗良贺江林
Owner 罗平安
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