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Apparatus and method for measuring gas phase saturation degree of single tube core during foam flooding process

A working method, technology of foam generating device

Active Publication Date: 2015-07-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the third issue of "Petroleum and Natural Gas Chemical Industry" in 2008, an article "Research on the Plugging Characteristics and Influencing Factors of Nitrogen Foam in Porous Media" published by Zhang Xing was recorded. The experimental device and method for the influence of foam plugging performance, but did not mention the measurement method of gas saturation in the rock core and its influence on foam plugging performance
The measurement methods of oil saturation and gas saturation in rock cores are quite different, and they have different influence mechanisms on foam plugging performance. The former affects the stability of foam, and the latter reflects the plugging ability of foam. Therefore, the current experiment The device cannot measure the gas saturation in the rock, nor can it study the influence of gas saturation on foam plugging

Method used

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  • Apparatus and method for measuring gas phase saturation degree of single tube core during foam flooding process
  • Apparatus and method for measuring gas phase saturation degree of single tube core during foam flooding process
  • Apparatus and method for measuring gas phase saturation degree of single tube core during foam flooding process

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Experimental program
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Embodiment 1

[0041] Such as figure 1 shown.

[0042] A device for measuring the gas phase saturation of single-pipe core foam flooding, including a foam generating device, an intermediate container 7 for holding formation water, a constant temperature box 18, a core tube 14 and a data acquisition system; the core tube 14 is installed in the In the constant temperature box 18; the foam generating device and the intermediate container 7 containing the formation water are respectively connected to the entrance of the core pipe 14 through the three-way valve 9; the data acquisition system includes pressure sensors connected to the computer 13 respectively 10. Pressure sensor 12 and load cell 19, the pressure sensor 10 is installed at the entrance of the core tube 14, the pressure sensor 12 is installed at the outlet of the core tube 14, and the load cell 19 is installed at the The bottom of the core tube 14; the pressure sensors 10 and 12 are used to monitor the differential pressure at both ...

Embodiment 2

[0046] Required conditions for the method of measuring the gas phase saturation of single-tube core foam drive: i ignore the mass of gas in the core tube 14; ii the density of the foaming agent solution is equal to the density of formation water.

[0047] A method utilizing the device described in Example 1 to measure the saturation of the single-pipe core foam flooding gas phase, comprising the following steps:

[0048] (1) Simulate the formation conditions of the oilfield: fill the core tube 14 with quartz sand according to the experimental ratio;

[0049] (2) Measure the permeability of the core tube 14 with a gas permeability meter, and weigh the dry weight of the core tube 14 after sand filling in m 0 :

[0050] The proportion of quartz sand used in this embodiment is by mass: 100-120 mesh quartz sand: 10-20 parts; 160-180 mesh quartz sand: 80-90 parts. The permeability of the core pipe 14 at the filled place is 234×10 -3 μm 2 , the dry weight of the core tube 14 m 0...

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Abstract

The present invention relates to an apparatus for measuring a gas phase saturation degree of single tube core during a foam flooding process. The apparatus mainly comprises a foam generation device, a middle container for holding formation water, a constant temperature oven , a core tube and a data acquisition system, wherein the foam generation device part mainly for mainly producing foam for core flooding mainly comprises a gas cylinder, middle containers, a constant flow pump, a foam generator and other equipment, the core tube, a pressure gauge, a scale, a back pressure valve and an output fluid collection device are arranged inside the constant temperature oven, an injected fluid is injected into the core in the constant temperature oven, a quality of the core tube is measured, and the data acquisition system mainly for data acquisition mainly comprises a computer, a pressure sensor, a weight weighing sensor and other equipment. According to the present invention, changes of the qualities of the sing tube core at different time points are converted into different gas phase saturation degrees in the tube core, and the fluid injection amount and changes of pressure on both ends of the single tube core are combined so as to analyze reservation conditions of the foam in the single tube core at different injection amounts.

Description

technical field [0001] The invention relates to a device and method for measuring the gas phase saturation of single-pipe rock core foam driving, belonging to the technical field of petrochemical industry. Background technique [0002] As a good oil displacement agent, foam has gradually been recognized by people. It can greatly increase the apparent viscosity of the injected fluid, increase the swept area, and is selective for oil-water plugging. There are many factors that affect the foam plugging ability. In addition to the gas-liquid ratio of the foam system, the permeability of the rock, the type and concentration of the foam system, the injection method, and the oil saturation, the gas phase saturation is the most important factor that affects the foam. Another important factor affecting the plugging capacity, the value of this parameter reflects the residual degree of gas in the core, that is, the gas occupies a certain pore space and becomes bound gas, thereby reduci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/02
Inventor 李松岩李兆敏张东李宾飞张超
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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