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Fluid phase analysis apparatus and fluid phase analysis method

An analysis device and fluid phase technology, applied in the field of fluid phase state analysis devices, can solve problems such as inability to guarantee sample volume, difficulty in sampling, inability to meet test requirements, etc., and achieve the effects of saving on-site sampling operation costs, being convenient to carry, and having a small volume

Active Publication Date: 2016-01-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, with CO 2 Field application of miscible flooding technology in oilfields at home and abroad, CO 2 - The miscible or near-miscible state of formation oil is complex and changeable, and there are many types of oil-gas miscible or near-miscible areas. It is difficult to take downhole samples in the test area and the sample volume cannot be guaranteed, and it is difficult to determine through one-time measurement. Fine volume changes are required to determine the bubble point Pressure changes around pressure
Therefore, the existing test and analysis devices can no longer meet the actual test requirements, and a new type of fluid phase analysis device and analysis method is urgently needed to overcome the above shortcomings

Method used

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  • Fluid phase analysis apparatus and fluid phase analysis method
  • Fluid phase analysis apparatus and fluid phase analysis method

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Embodiment 1

[0045] This embodiment provides a fluid phase analysis device. The device includes three groups of analysis units, which are respectively the first analysis unit ( figure 1 is the front view of the first analysis unit, figure 2 is the side view of the first analysis unit), the second analysis unit and the third analysis unit;

[0046] Each analytical unit includes: a first container, a second container and a sample transfer device:

[0047] The volume of the first container is the same as that of the second container, which is 5mL, and the top material of both containers is sapphire glass;

[0048] The top of the first container is provided with a first pipeline. The first pipeline is provided with a first valve and a gas meter sequentially along the direction extending outward. The middle of the first container is provided with a second pipeline communicating with the sample transfer device. The second pipeline is provided with a second pressure gauge and a second valve i...

Embodiment 2

[0053] This embodiment provides the process of using the fluid phase analysis device in Embodiment 1 to perform P-V test.

[0054] The process of performing P-V test on the first analysis unit is:

[0055] (1) Roughly measure the bubble point pressure P of crude oil A b0 to 6.7MPa, the temperature of the first container, the second container, and the sample transfer device is kept constant until the formation temperature T of crude oil A is 83.08°C, each valve is kept closed, and the motor drives the movable parts of the sample transfer device to keep the internal space in a state of minimum volume (such as image 3 shown);

[0056] (2) Open the fourth valve to introduce pressurized crude oil, and continue pressurizing and injecting after the crude oil is full of the second container until the pressure P in the second container 0 =32MPa, close the fourth valve;

[0057] (3) Open the third valve, and the motor drives the movable parts of the sample transfer device to gradual...

Embodiment 3

[0066] This embodiment provides the process of using the fluid phase analysis device in Embodiment 1 to perform a flash test.

[0067] The process of flash test using the first analysis unit is:

[0068] (1) Constantly temperature the first container, the second container and the sample transfer device to the formation temperature T (83.08°C) of the crude oil A, keep all valves closed, and move the movable parts of the sample transfer device to keep the internal space in a state of minimum volume;

[0069] (2) Open the fourth valve to introduce pressurized crude oil. When the crude oil is full of the second container, open the third valve to move the movable parts so that the internal space of the sample transfer device gradually changes from the state of minimum volume to the state of maximum volume. After the internal space, continue to pressurize and inject until the pressure in the second container reaches the formation pressure P (18.33MPa) of crude oil, then close the th...

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Abstract

The invention provides a fluid phase analysis apparatus and a fluid phase analysis method. The fluid phase analysis apparatus includes at least one set of analysis units. Each analysis unit includes a first container, a second container and a sample transfer device. The sample transfer device achieves accurate transfer of a test sample through change of volume of inside space itself and meanwhile tests the changes of relative parameters of the test sample. Macroscopically, the apparatus allows single-phase and double-phase situations of crude oil to be observed directly, and microscopically, allows P-V relationship analysis and flash experiment test to be carried out under different phase conditions. By means of a plurality of fine measurements of volume change, bubble point pressure, gas-oil ratio, formation volume factor and the like stratum parameters of stratum oil are accurately obtained. The apparatus and the method solve a difficult problem of test of basic phase parameters of a micro-scale sample, thereby saving cost in on-site sampling and operations on an oil and gas field.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a fluid phase analysis device and an analysis method thereof. Background technique [0002] The physical parameters of oil and gas reservoir fluids are important basic data for oil and gas field reserve calculation and development plan formulation. The high temperature and high pressure oil and gas phase state test has always been an indispensable basic test for evaluating formation oil properties, and it is also an indispensable and important test device for obtaining key phase state parameters of oil and gas reservoir fluids. Accurately and truly obtaining the oil and gas phase state parameters in the reservoir is inseparable from the high temperature and high pressure oil and gas reservoir fluid phase state test analyzer (PVT instrument for short). Existing PVT instruments mainly include two structures: piston type and plunger type. The piston PVT ins...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/28
Inventor 张可马德胜李实陈兴隆
Owner PETROCHINA CO LTD
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