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Rock core displacement effect visual evaluation method

A technology of core displacement and evaluation method, which is applied in the direction of nuclear magnetic resonance analysis, etc., and can solve the problems of not being able to accurately know the internal situation

Active Publication Date: 2013-05-08
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The rock core is equivalent to a black box for researchers, and it is impossible to know exactly what is going on inside it.

Method used

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  • Rock core displacement effect visual evaluation method
  • Rock core displacement effect visual evaluation method
  • Rock core displacement effect visual evaluation method

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Experimental program
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Embodiment

[0021] Such as figure 1 As shown, the device of this test method includes constant speed and constant pressure pump 1, liquid storage tank 2, inlet pressure gauge 3, nuclear magnetic core holder 4, ring pressure tracking pump 5, outlet pressure gauge 6, back pressure valve 7, electronic Balance 8, back pressure container 9, back pressure gauge 10, back pressure pump 11, computer 12, nuclear magnetic resonance coil 13.

[0022] The visualization method of the oil displacement effect of the present embodiment, the test steps are:

[0023] 1) Measure and record the length, width, weight and other data of the core, then vacuum and saturate it with formation water, and calculate the porosity to be 24.59%.

[0024] 2) Insert the core and the front and rear connectors into the rubber hose, heat-molded to form a displacement tube, put it into the nuclear magnetic core holder 4, connect the quick connector converters at both ends, and put it into the test coil of the low-field nuclear...

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Abstract

The invention relates to a rock core displacement effect visual evaluation method. The distribution characteristic and effect of a solution A for displacing another solution B in the rock core are determined by using specific rock core nuclear magnetic resonance equipment, wherein the solution A and the solution B need to be selected from different groups, and are significantly different in relaxation time. The method comprises the following specific steps of: placing a rock core in a rubber tube, thermosetting, placing into an anti-magnetic holder, and placing into a nuclear magnetic resonance test coil; loading the solutions A and B into a solution container; starting nuclear magnetic resonance imaging MRI and rock core application as well as displacement software, and inputting data of the rock core and a displacement solution; adjusting the flow rate and the pressure difference between annular pressure and displacement pressure, starting a pump to displace the solution A, and reversing the process to displace the solution B when only the solution A flows from the outlet; determining and recording 2D images and T2 spectra of the rock core and fluid at different moments when the solution A is displaced by the solution B, and stopping displacement when the 2D images and T2 spectra have no changes; and processing the data to obtain the distribution cloud images of the fluid at different moments.

Description

technical field [0001] The invention relates to a visual evaluation method of core displacement effect, which displays the distribution characteristics of two-phase fluid in the process of core displacement experiment by means of low-field nuclear magnetic resonance imaging, and belongs to petroleum engineering enhanced oil recovery technology and experimental fluid mechanics technology field. Background technique [0002] The core displacement process in the laboratory is a well-recognized method for studying the fluid flow in the core, and is widely used in petroleum development and environmental science and other fields. At the same time, low-field nuclear magnetic resonance is a high-tech that has developed rapidly in recent years, and has been well applied in the medical and food industries. How to observe the flow or distribution characteristics of fluid in the core porous medium is the goal and important work that has been pursued and carried out in the field of ...

Claims

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Application Information

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IPC IPC(8): G01N24/08
Inventor 狄勤丰顾春元程毅翀华帅
Owner SHANGHAI UNIV
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