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Crude oil recovery method

A production method and technology for crude oil, which are applied in the fields of production of fluids, earthwork drilling, wellbore/well components, etc., can solve the problems of long reaction time and difficult implementation, achieve convenient operation, solve the scarcity of dilute oil sources, and reduce the viscosity of catalyzed good effect

Active Publication Date: 2013-10-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using the above-mentioned catalysts or viscosity reducers to catalytically reduce the viscosity of heavy oil, it is necessary to add hydrogen, methane, etc., or to add hydrogen or oxygen donors, which is difficult to implement and takes a long time to react.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First add 1.08g of nickel sulfate catalyst into 2.16g of deionized water, then add the mixture and 108g of heavy oil (the dynamic viscosity after degassing and dehydration at 50°C is 2310mPa·s) into a 300mL reactor, and heat the reactants to 160°C, keep the reaction pressure at 6MPa, and stir for 200min. The measured kinetic viscosity of the product oil after the reaction after degassing and dehydration at 50°C is 821mPa·s, which is injected into the oil well as the diluted oil to extract the crude oil in the oil well.

Embodiment 2

[0033] First add 0.01g of ferrous sulfate catalyst into 375g of deionized water, then add the mixture and 250g of heavy oil (the dynamic viscosity after degassing and dehydration at 50°C is 2310mPa·s) into a 1L reactor, and heat the reactants to 320°C, keep the reaction pressure at 0.4MPa, and stir for 30min. The measured dynamic viscosity of the product oil after the reaction after degassing and dehydration at 50°C is 847mPa·s, which is injected into the oil well as the diluted oil to extract the crude oil in the oil well.

Embodiment 3

[0035] First 0.25g ferrous sulfate, 0.12g vanadyl sulfate and 0.13g molybdenum sulfate catalyst are added in 28.8g deionized water, then this mixture and 120.1g heavy oil (the dynamic viscosity after degassing and dehydrating at 50 ℃ is 3470mPa. s) Add it into a 300mL reactor, heat the reactant to 265°C, keep the reaction pressure at 4MPa, and stir for 100min. The measured kinetic viscosity of the product oil after the reaction after being degassed and dehydrated at 50°C is 283mPa·s, and it is injected into the oil well as the diluted oil to extract the crude oil in the oil well.

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Abstract

The invention discloses a crude oil recovery method. The method comprises placing a mixture in a condition which enables the heavy components of heavy oil to be under catalytic cracking for reaction, wherein reaction products serve as blending diluting oil to be injected into an oil well to recover the crude oil in the oil well, the mixture is composed of the heavy oil, catalysts and water which have a weight ratio of 1: (0.00004-0.01): (0.02-1.5). According to the crude oil recovery method, the viscosity of the heavy oil which is provided with a dynamic viscosity not less than 1000mPa*s after degassing and dewatering at a temperature of 50 DEG C can be reduced without additional hydrogen donors or oxygen donors, the catalytic viscosity reduction effects are good, and the obtained blending diluting oil can be injected into the crude oil to a certain scale to achieve diluted oil recovery. Meanwhile, the method does not require any other additives, achieves the aim of preparing the blending diluting oil in a short time and at a low temperature and a low pressure, solves the problem of thin oil scarcity of certain oil fields and is applicable to the practical application of oil fields.

Description

technical field [0001] The invention relates to a crude oil extraction method, in particular to an underground heavy oil extraction method. Background technique [0002] In the world's oil resources, the geological reserves of heavy oil far exceed the reserves of conventional crude oil. With the increasing demand for oil, the gradual reduction of conventional crude oil resources makes heavy oil have great development value. Heavy oil in the world's oil production production has gradually increased. However, the high content of colloid and asphaltene in heavy oil makes its viscosity and freezing point high, which makes it more difficult to extract and refine heavy oil. [0003] Due to the high viscosity of heavy oil, the fluidity of heavy oil becomes poor during production and gathering and transportation, the flow resistance increases, and the lifting of the wellbore and long-distance transportation of the tubing become very difficult. At present, the main production metho...

Claims

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Application Information

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IPC IPC(8): E21B43/24E21B43/22
Inventor 陈锡荣张天宇张增丽许春梅黄凤兴
Owner CHINA PETROLEUM & CHEM CORP
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