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A device and experimental method for carbon dioxide diffusion and oil discharge in tight oil reservoirs

A carbon dioxide and tight oil technology, applied in the field of tight oil exploration, can solve problems such as complex diffusion and mass transfer mechanisms

Active Publication Date: 2019-07-30
INST OF MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Carbon dioxide has multiple phases (gas, liquid, and supercritical state) under formation conditions, and the diffusion and mass transfer mechanism of carbon dioxide in tight oil reservoirs is also relatively complicated, and there is no research on this aspect so far

Method used

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  • A device and experimental method for carbon dioxide diffusion and oil discharge in tight oil reservoirs
  • A device and experimental method for carbon dioxide diffusion and oil discharge in tight oil reservoirs
  • A device and experimental method for carbon dioxide diffusion and oil discharge in tight oil reservoirs

Examples

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Embodiment 1

[0041] The tight oil samples used in the following examples come from the Chang 7 Member formation in the Ordos Basin.

[0042] Such as figure 1 As shown, in one embodiment of the present invention, a device for carbon dioxide diffusion and oil discharge in tight oil reservoirs includes a control room 4, a gas storage tank 1, an extraction tank 10, and a temperature and pressure controller 12;

[0043] The inside of the control room 4 is equipped with a nuclear magnetic resonance instrument 6, and the nuclear magnetic resonance instrument 6 is provided with a reactor 8 for holding tight oil samples, which is used to detect the T2 spectrum of the tight oil samples; The input end is connected, and the carbon dioxide is delivered to the reactor 8; one end of the temperature and pressure controller 12 is connected with the output end of the gas storage tank 1, and the phase state of the carbon dioxide output by the gas storage tank 1 is adjusted by adjusting its temperature and pr...

Embodiment 2

[0050] The experimental method of carrying out the diffusion and oil discharge of tight oil reservoirs by using the device of carbon dioxide diffusion oil discharge in the tight oil reservoirs of Example 1 comprises the following steps:

[0051] 1) Take a tight oil sample, then put it into the reaction kettle and measure the length 4.2cm, diameter 2.5cm, initial mass M of the tight oil sample 1 =65.8g and initial NMR T2 spectrum (as figure 2 shown);

[0052] 2) close the first pressure reducing valve and the second pressure reducing valve, open the switch of the gas storage tank, the gas booster pump and the temperature and pressure controller; The temperature is 60°C and the pressure is 14MPa, and supercritical carbon dioxide is obtained as the medium for the diffusion and oil discharge of the reactor;

[0053] 3) Open the first pressure reducing valve and the second pressure reducing valve, the carbon dioxide enters the reactor, and discharge the air in the reactor, then ...

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Abstract

The invention discloses a device for diffusion and oil discharge of carbon dioxide in a tight oil reservoir, wherein the device includes a temperature control room, a gas storage tank, a temperature and pressure controller and an extraction tank; the temperature control room is used for controlling constancy of the temperature in a diffusion and oil discharge experimental process, and the interiorof the temperature control room is provided with a nuclear magnetic resonance instrument and a reaction kettle, wherein the reaction kettle is located in the nuclear magnetic resonance instrument andused for accommodating dense oil samples; the gas storage tank is used for storing carbon dioxide and transporting carbon dioxide to the reaction kettle; the temperature and pressure controller is used for regulating the temperature and pressure of the storage tank and the temperature control room, so as to analyze diffusion and oil discharge of carbon dioxide with different phase states; the extraction tank is used for extracting petroleum oil components in carbon dioxide outputted by the reaction kettle to be used as detection samples of gas chromatography. The invention also discloses an experimental method for diffusion and oil discharge of the tight oil reservoir. The device and the experimental method can measure the temperature, pressure, oil output capacity and dynamic distribution of residual oil in matrix pores in the process of diffusion and oil discharge of carbon dioxide with different phase states in real time, and help to deeply understand a diffusion and mass transfermechanism of carbon dioxide in tight oil.

Description

technical field [0001] The invention belongs to the technical field of tight oil exploration, and in particular relates to a device and an experimental method for carbon dioxide diffusion and oil discharge in tight oil reservoirs. Background technique [0002] my country's tight oil resources are widely distributed and have broad development potential. It is also one of my country's strategic energy sources. At present, the outstanding problems faced by tight oil development are low single well production and rapid production decline. Therefore, it is particularly important to study the energy supplement of tight oil reservoirs and improve the production rate of tight oil reservoirs. The study found that injecting carbon dioxide into the formation is an important method to replenish formation energy and enhance recovery, and this method has received extensive attention in the field of oil and gas field development. Due to the characteristics of low porosity and low permeabi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24G01N24/08G01N30/02
Inventor 杨柳鲁晓兵张旭辉沈伟军
Owner INST OF MECHANICS CHINESE ACAD OF SCI
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