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Method for measuring capillary pressure of CO2-saline-core system based on X-ray computed tomography (CT) technology

A technology of capillary pressure and measurement method, which is applied in the field of petroleum scientific research, can solve problems such as high measurement cost, large measurement error, and high requirements for measurement conditions, and achieve the effect of reducing measurement error and simple operation process

Active Publication Date: 2017-02-08
DALIAN UNIV OF TECH
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Problems solved by technology

[0003] Traditional CO 2 -Brine-core system capillary pressure measurement methods generally use semi-permeable diaphragm method, mercury injection method and centrifugation method for measurement, but they have the following disadvantages: First, they have high requirements for measurement conditions and are easy to introduce large measurement errors; Second, it is destructive to the measurement sample, and the measurement cost is high; third, the measurement takes a long time, and generally only the overall capillary pressure of the core sample can be measured, and the local capillary pressure cannot be measured

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  • Method for measuring capillary pressure of CO2-saline-core system based on X-ray computed tomography (CT) technology
  • Method for measuring capillary pressure of CO2-saline-core system based on X-ray computed tomography (CT) technology
  • Method for measuring capillary pressure of CO2-saline-core system based on X-ray computed tomography (CT) technology

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Embodiment Construction

[0046] Specific embodiments of the present invention will be described in detail below in conjunction with specific technical solutions and accompanying drawings.

[0047] Step one, CO 2 -Salt water interfacial tension measurement

[0048] Using the interfacial tensiometer, the pendant drop method was used to analyze the CO under the condition of set temperature and pressure. 2 - Salt water interfacial tension σ is measured.

[0049] Step 2. Displacement core and X-ray CT scan

[0050]1) Place the core holder 1 on the stage of the micro-focus X-ray CT2, inject brine with a pore volume greater than 50 through the brine injection pump 3 after vacuuming, control the pressure and temperature to rise to the set requirements, and then statically Place it for more than 12 hours to ensure that the core is fully saturated with brine and there are no residual air bubbles in the core.

[0051] 2) Utilize the brine injection pump 3 to inject saturated CO with a pore volume greater tha...

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Abstract

The invention belongs to the technical field of scientific research of oil and provides a method for measuring capillary pressure of a CO2-saline-core system based on an X-ray CT technology. The measuring method disclosed by the invention comprises the following four steps: measuring CO2-saline interfacial tension, performing core displacement and CT scanning, performing CT image processing and measuring the capillary pressure. By utilizing the X-ray CT technology, the method disclosed by the invention has the characteristics of relatively high resolution and capacity of performing nondestructive testing on samples, is capable of accurately, conveniently and really measuring the capillary pressure of the CO2-saline-core system in different flow conditions, and can measure local core capillary pressure and overall core capillary pressure, so that the measurement scale reaches the pore scale. Moreover, the measuring method can be popularized to measuring the capillary pressure of any gas-liquid porous medium system or liquid-liquid porous medium system.

Description

technical field [0001] The invention belongs to the technical field of petroleum scientific research and relates to a CO2 based on X-ray CT imaging technology. 2 - Capillary pressure measurement method for brine-core system. Background technique [0002] Due to the continuous advancement of the industrialization process, a large amount of CO 2 Emissions have caused a serious greenhouse effect. On the other hand, the massive consumption of fossil fuels has exacerbated the problem of energy shortage. CO 2 As a promising emission reduction method, geological storage technology has the advantages of wide selection of sites and huge storage capacity. In addition, CO 2 Geological storage technology can also be used to enhance oil recovery and alleviate energy shortages. As one of the important parameters to characterize the flow of porous media, capillary pressure is the necessary data for studying the pore structure of rocks and the two-phase seepage in rocks. How to Measur...

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Application Information

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IPC IPC(8): G01N23/04G06T5/00G06T7/136
CPCG01N23/046G06T2207/10081G06T5/73
Inventor 宋永臣吕鹏飞刘瑜蒋兰兰武博浩赵佳飞王大勇刘树阳
Owner DALIAN UNIV OF TECH
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