Method for simultaneously measuring layered water content and pore size distribution of rock core

A technology of pore size distribution and measurement method, which is applied in the field of simultaneous measurement of rock core layer water content and pore size distribution, can solve the problem that the water content and pore size distribution of any layer of rock core cannot be tested at the same time, and achieve non-destructive testing of samples. Good, the effect of simple test process

Pending Publication Date: 2021-05-25
SUZHOU NIUMAG ELECTRONICS TECH
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  • Claims
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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is that the existing technology cannot realize the water content and pore size distribution test of any layer of rock core at the same time.

Method used

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  • Method for simultaneously measuring layered water content and pore size distribution of rock core
  • Method for simultaneously measuring layered water content and pore size distribution of rock core
  • Method for simultaneously measuring layered water content and pore size distribution of rock core

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Embodiment 1

[0045] Step 1, preparation of calibration samples and cores to be tested:

[0046] Select five groups of core calibration samples with uniform water content, the water content is 0.1g, 0.5g, 1g, 2g and 3g, and the water content is 1%, 5%, 10%, 20%, 30% respectively;

[0047]Prepare a test core with a diameter of 25mm and a length of 25mm, which is standard sandstone. Place the test core in an oven at 105°C and dry it for 24 hours, then weigh the dry weight of the test core to be 46.6448g; then place the test core In the vacuum water saturation device, add formation water and evacuate and saturate for 48 hours, so that the pores of the core to be tested are completely saturated with formation water, and then weigh the weight of the saturated water core to be tested to be 45.8968g, and the water content of the core is 0.748g ;

[0048] Step 2, apply the pulse train

[0049] Put the calibration sample rock into the sample compartment of the nuclear magnetic resonance instrument...

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Abstract

The invention relates to the technical field of oil exploration, in particular to a method for simultaneously measuring the water content and the pore size distribution of a rock core. The invention discloses a pulse sequence applying method for detecting the moisture content and the pore size distribution of a rock core, which comprises the following steps of: applying a frequency coding gradient between radio-frequency pulses, so that the resonant frequencies of water in different layers in a calibrated rock sample are different, thereby realizing layered detection on the rock core to be detected; obtaining a calibrated rock sample signal curve with uniform water content by using an application test of a pulse sequence, and establishing a calculation model for calibrating the water content of each layer; and utilizing the calculation model to obtain the water content of the saturated rock core to be measured at different layers, and obtaining the pore size distribution of the rock core to be measured. Compared with a conventional testing method, the method is simple in testing process and short in testing time, and nondestructive testing of the sample can be achieved; the water content and pore size distribution test of any layer number of the rock core can be simultaneously achieved, and the method has great significance for exploration research and analysis.

Description

technical field [0001] The invention relates to the technical field of well logging evaluation of oil and gas reservoirs in petroleum exploration, in particular to a method for simultaneously measuring the water content and pore size distribution of rock core layers. Background technique [0002] In the process of oil and gas exploration and development, core water content and pore size distribution are an important index for evaluating oilfield economic development. In the process of secondary oil recovery in the oil field, the oil recovery rate of the oil well is improved by injecting water into the production well, that is, the oil well. but if figure 1 As shown, the process of injecting water to push the crude oil in the formation to the production well is not piston-like, but pointed at a certain angle, and the water cut will be different at different positions in the formation. Therefore, how to accurately measure the water content and pore size distribution of cores...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
CPCG01N24/081Y02A90/30
Inventor 杨培强
Owner SUZHOU NIUMAG ELECTRONICS TECH
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