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Density measuring method and density measuring instrument for single-phase fluid under oil reservoir condition

A technology for density measurement and fluid density, which is applied in the field of petroleum physical property measurement, can solve problems such as long measurement time, and achieve the effect of simple test method, rigorous test principle, and shortened measurement time

Active Publication Date: 2012-02-15
PETROCHINA CO LTD
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Problems solved by technology

[0006] The invention provides a single-phase fluid density measurement method under reservoir conditions to solve the problem that the existing measurement method needs to convert the high-temperature and high-pressure fluid into normal temperature and pressure, resulting in long measurement time

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  • Density measuring method and density measuring instrument for single-phase fluid under oil reservoir condition

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Embodiment Construction

[0044] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0045] 1. method principle of the present invention

[0046] The density measurement of single-phase fluid under reservoir conditions adopts the double falling ball method, and its principle is as follows. For the force analysis of the ball falling vertically, see figure 1 , to obtain Equation 1, where τ is the viscous resistance of the tube wall when the ball falls.

[0047] G 1 -F 浮1 -τ 1 =m 1 a 1 (1)

[0048] G 2 -F 浮2 -τ 2 =m 2 a 2 (2)

[0049] τ = μA du dy

[0050] Such as figure 2 , take an annular zone on the ball, then the area dS=2π·(R-d)·r·dθ, the velocity gradient Then the viscous force τ can be integrated and calculat...

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Abstract

The invention provides a density measuring method for a single-phase fluid under an oil reservoir condition and a density measuring instrument for the single-phase fluid under the oil reservoir condition. The density measuring method for the single-phase fluid under the oil reservoir condition at least comprises the following steps: A, placing two small balls with the same radius but different weights at an upper position and a lower position which are different in a measuring pipe; B, setting the temperature of the measuring pipe to be an oil reservoir temperature, and heating the measuring pipe until the temperature is stable; C, filling a selected fluid in the measuring pipe, and gradually pressurizing until the pressure in the measuring pipe reaches an oil reservoir pressure; D, filling an oil reservoir fluid in the measuring pipe, and synchronously discharging the selected fluid from the measuring pipe under a constant-pressure condition; and E, loosening a first small ball of the two small balls, measuring the time that the first small ball passes through a testing distance of the measuring pipe, loosening the second small ball of the two small balls after the oil reservoir fluid in the measuring pipe is stable, and measuring the time that the second small wall passes through the testing distance.

Description

technical field [0001] The invention belongs to the technical field of petroleum physical property measurement, and in particular relates to a single-phase fluid density measurement method and a density measurement instrument under oil reservoir conditions. Background technique [0002] In the measurement experiment of petroleum physical property parameters, fluid density is a basic parameter. Research has shown that methods and instruments for density measurement are diverse and suitable for different specialties. However, for the high-temperature and high-pressure environment of reservoirs, it is difficult for the existing methods and instruments to achieve the three aspects of test accuracy, high-temperature and high-pressure test conditions and easy operation. [0003] Generally, the basic method of mass-to-volume ratio is used to measure fluid density under reservoir conditions, and its measurement accuracy and test conditions meet the requirements of research analysis...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/34
Inventor 陈兴隆秦积舜李实张可
Owner PETROCHINA CO LTD
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