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Method for measuring low-temperature oxidation reaction rate of light crude oil

A technology of oxidation reaction rate and determination method, which is applied in measurement devices, preparation of test samples, instruments, etc., can solve the deviation of reaction rate value from actual value, does not consider the change of gas phase saturation, and does not consider pressure to reduce pressure changes, etc.

Active Publication Date: 2013-04-17
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

At present, there are reports at home and abroad that the pressure drop method is used to measure the reaction rate of low-temperature oxidation of crude oil, such as the article "Experiment of enhanced oil recovery by air-injection foam low-temperature oxidation process" (Journal of China University of Petroleum, 2009 No. 4: 94-98) As stated, usually within the test time range, the pressure drop caused by the dissolution of air in the formation is much greater than the pressure drop caused by oxygen consumption, and this method does not take into account the pressure drop caused by the dissolution of air in the formation crude oil and the reaction During the process, due to the pressure change caused by the change of the composition of the gas phase components, the reaction rate value measured by this method deviates too much from the actual value; Lack of comparability between rates
It is also reported in the literature that the low-temperature oxidation reaction rate can be calculated by monitoring the composition of the gas produced at the outlet of the core flow experiment, such as the article "Research on low-temperature oxide molds for air injection of Caotai high pour point oil" (Drilling and Production Technology, No. 11, 2008 : 113-115), this method does not consider the influence of the dissolution of air in crude oil, the change of gas phase saturation in the core, and the difference between the solubility of oxygen and nitrogen on the composition of produced gas components, and the measured results are different from the actual values. large deviation

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  • Method for measuring low-temperature oxidation reaction rate of light crude oil
  • Method for measuring low-temperature oxidation reaction rate of light crude oil
  • Method for measuring low-temperature oxidation reaction rate of light crude oil

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Example 1: Determination of the low-temperature oxidation reaction rate of a certain crude oil at a temperature of 363.15K and a pressure of 23.5 MPa.

[0050] 1. After dehydrating the dead oil sample retrieved from the site and passing it, it is ready for use.

[0051] 2. Compress the air into the sample dispenser, keep the constant temperature at 343.15K, and the constant pressure to 23.5MPa for more than 4 hours, and then use it.

[0052] 3. Transfer 291.23g of dehydrated dead oil into the sample dispenser as a reaction vessel, keep the temperature at 363.15K, and the constant pressure at 23.5MPa for more than 4 hours; ) into the sampler to mix with crude oil.

[0053] 4. Keep the temperature of the sample dispenser transferred to crude oil and air at 363.15K, the constant pressure at 23.5MPa, stir and record the time.

[0054]5. After 48, 96, 144, 192, and 240 hours of cumulative reaction, take out a small amount of cap gas, record the volume of the cap gas discha...

Embodiment 2

[0060] Example 2: Determination of the low-temperature oxidation reaction rate of a certain crude oil at a temperature of 383.15K and a pressure of 23.5 MPa.

[0061] 1. After dehydrating the dead oil sample retrieved from the site and passing it, it is ready for use.

[0062] 2. Compress the air into the sample dispenser, keep the constant temperature at 343.15K, and the constant pressure to 23.5MPa for more than 4 hours, and then use it.

[0063] 3. Transfer the dead oil sample that has passed the dehydration into the sampler as a reaction vessel, the quality of the transferred crude oil is 307.64g, keep the temperature at 383.15K, and the pressure at 23.5MPa for more than 4 hours. 162.17mL of compressed air (343.15K, 23.5MPa) was transferred into the sampler by double pump method to mix with crude oil.

[0064] 4. Constant temperature to 383.15K, constant pressure to 23.5MPa, stir and record the time of the sampler that is transferred to crude oil and air.

[0065] 5. Aft...

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Abstract

The invention relates to a method for measuring the low-temperature oxidation reaction rate of light crude oil in indoor experimental research on oil recovery. The method uses a sampler as a reaction vessel, and the gas-oil ratio obtained through a single degassing experiment of crude oil at different reaction stages Calculate the amount of dissolved gas, through the change of gas cap gas and dissolved gas composition, calculate the amount of gas cap gas in different reaction stages, the amount of crude oil participating in the oxidation reaction and the oxygen consumption according to the law of mass conservation, and calculate the different The average reaction rate of low-temperature oxidation reaction of crude oil in the reaction stage, the invention can accurately measure the average oxidation reaction rate value of crude oil in different reaction stages, and provide basic data for the calculation of kinetic parameters of crude oil oxidation reaction and the comparison of reactivity between different crude oils.

Description

technical field [0001] The invention relates to a method for measuring the low-temperature oxidation reaction rate of light crude oil, which belongs to the technical field of indoor experimental research on oil field enhanced oil recovery. Background technique [0002] Before the implementation of high-pressure air injection and air injection foam EOR projects in light oil reservoirs, laboratory research and data evaluation of formation fluids are required to help determine and optimize operating conditions. Among them, the measurement of crude oil low-temperature oxidation reaction rate is the basis for calculating the kinetic parameters of crude oil oxidation reaction. Safety is also related to the difficulty of spontaneous formation of the combustion front, which has an important impact on the improvement of oil recovery. At present, there are reports at home and abroad that the pressure drop method is used to measure the reaction rate of low-temperature oxidation of cru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N1/28
Inventor 刘勇林伟民赵化廷陈永浩吴信荣肖良高海涛王进安李雪峰
Owner CHINA PETROLEUM & CHEM CORP