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A device and method for evaluating movable oil saturation in shale

An evaluation method, shale technology, applied in the direction of measuring devices, test sample preparation, sampling, etc., can solve the problem of not being able to represent the developable oil reserves of movable oil, affecting oil and water saturation, and being unable to determine oil and water, etc. problem, to achieve the effect of shortening the experimental cycle, speeding up self-priming, and reliable data

Inactive Publication Date: 2019-08-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Only after clarifying the content of crude oil in the shale in the free state, adsorption and dissolved state, can the development plan be established in a targeted manner. The current patent reports or documents are all focused on the characterization of the total porosity and organic porosity of shale. The existence of pores in shale provides a place for oil storage, but it can only represent the possible amount of oil reserves in shale, not the movable oil or developable oil reserves, which is more important for the design and selection of development plans The guiding significance is the reserves of movable oil in different occurrence states, but there is no literature or patent report related technology or method to quantify the movable oil in shale in free state and adsorption and dissolution state representation of
The prior art also provides a method for quantitatively controlling the amount of movable oil in the oil-water imbibition process of the rock block. This method quantitatively controls the oil-water content in the rock block through oil-water two-phase imbibition to obtain a certain oil-water distribution. Due to the use of finite vacuum saturation technology for cores, the existence of gas phases will occupy a certain space, so the measured oil and water content is much smaller than the saturation of rock blocks. This method cannot determine the oil and water content of the same core if it flows into water and oil successively. The amount of water when the core is fully saturated
In addition, since shale contains a large amount of clay, the injection of water will cause the clay to absorb water and expand, and the pores will change, thereby affecting the saturation of oil and water.
Therefore, this technique is also unable to quantitatively characterize the movable oil in shale, especially the movable oil existing in the free state and adsorption-dissolved state

Method used

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  • A device and method for evaluating movable oil saturation in shale
  • A device and method for evaluating movable oil saturation in shale
  • A device and method for evaluating movable oil saturation in shale

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Select the crushed sample 1 after oil washing and drying, weigh a sample with a mass of 46.76g, and add it to the airtight sample tank 1. The density of the sample is 2.21g / cm 3 , V 样 21.16cm 3 , through experiments, the initial and final volumes of the liquid in the first scale tube are 100.00 and 65.26 cm respectively 3 , the initial and final volumes of the liquid in the second graduated tube are 100.00 and 64.18 cm, respectively 3 , therefore, it can be calculated that the saturated amount ω′ of the alkane existing in the free state and the saturated amount ω″ of the alkane existing in the adsorbed dissolved state in the sample 1 are respectively 0.041 cm 3 / g and 0.023cm 3 / g.

Embodiment 2

[0096] Select the broken sample 2 that has been washed and dried, weigh a sample with a mass of 63.5g, and add it to a closed sample tank. The density of the sample is 2.42g / cm 3 , V 样 26.2cm 3 , through experiments, the initial and final volumes of the liquid in the first scale tube are 100.00 and 70.22 cm respectively 3 , the initial and final volumes of the liquid in the second graduated tube are 100.00 and 69.43 cm, respectively 3 , therefore, it can be calculated that the saturated amount ω′ of the alkane existing in the free state and the saturated amount ω″ of the alkane existing in the adsorbed dissolved state in the sample two are 0.031 cm 3 / g and 0.012cm 3 / g.

Embodiment 3

[0098] Select the broken sample three that has been washed and dried, weigh a sample with a mass of 45.2g, and add it to a closed sample tank. The density of the sample is 2.34g / cm 3 , V 样 19.32cm 3 , the initial and final volumes of the liquid in the first scale tube are obtained through experiments to be 10.00 and 63.86 cm respectively 3 , the initial and final volumes of the liquid in the second graduated tube are 100.00 and 63.08 cm, respectively 3 , therefore, it can be calculated that the saturation amount ω′ of the alkane existing in the free state and the saturation amount ω″ of the alkane existing in the adsorbed dissolved state in the sample three are respectively 0.032cm 3 / g and 0.017cm 3 / g.

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Abstract

The invention discloses a device for evaluating the saturation of movable oil in shale, which comprises a closed sample tank, a sample tank cover, a first scale tube, a second scale tube, a vacuum pump, a four-way valve, a communication port, and a first pipeline , the second pipeline, the third pipeline, the fourth pipeline, the first shut-off valve, the second shut-off valve, the third shut-off valve and the fourth shut-off valve; One end of the first pipeline communicates with the airtight sample tank, and the other end communicates with the four-way valve. The first pipeline is provided with a first shut-off valve; the first scale tube is connected with the four-way valve through the second pipeline, and the second pipeline is provided with a second shut-off valve. ; The second scale tube is connected to the four-way valve through the third pipeline, and the third pipeline is provided with a third stop valve; the vacuum pump is connected to the four-way valve through the fourth pipeline, and the fourth pipeline is provided with a fourth stop valve. The invention uses crushed samples to improve efficiency, respectively injects KCl solution and alkane through two graduated tubes, reduces pollution in the experiment process, and has accurate results.

Description

technical field [0001] The invention relates to the field of petroleum engineering and technology, in particular to a device and method for evaluating the saturation of movable oil in shale. Background technique [0002] With the in-depth study of shale gas theory and the rapid development of exploration and development, shale oil has also received extensive attention and high attention in recent years. As a sibling of shale gas, shale oil also has a relatively wide distribution. In the United States, shale oil production has increased rapidly since 2005, reaching 29.73 million tons in 2011, which has become the focus of unconventional oil and gas exploration and development. In addition, Canada and other countries have also made breakthroughs in shale oil exploration and development to varying degrees. [0003] my country is rich in shale oil resources. Since the 1960s, "shale fractured reservoirs" have been discovered in different oil and gas-bearing basins. With the de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N7/04G01N1/28
CPCG01N1/286G01N7/04
Inventor 宫厚健张少杰桑茜李亚军董明哲王宏前徐龙朱超凡张浩尚胜祥邹洪俊
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)