Modification and viscosity reduction method for in-situ combustion heavy oil recovery

A technology for modifying and reducing viscosity and burning oil layer, which is applied in the field of modifying and reducing viscosity and burning oil layer to recover heavy oil, can solve problems such as difficulty in combustion, and achieve the effect of reducing the cost of mining and gathering and transportation, wide applicability and improving quality.

Inactive Publication Date: 2013-11-27
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the above-mentioned problems, the present invention aims to provide a kind of oil-reservoir with only a small amount of fuel deposited in the thin oil reservoir during the production process, which can meet the requirements of high gas injection under the condition that the combustion is very difficult, and the method is simple and the cost is low. Modification and Viscosity Reduction Method for Exploitation of Heavy Oil in Combustion Reservoir

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In the experiment, a combustion tube was used to add heavy oil (viscosity of 12120.53mPa·s at 50°C) from an oilfield, no chemical additives were added, the air injection rate was 3L / min, the production pressure was maintained at 2.1MPa, and the mass percentages of oil, water and sand in the rock sample were respectively 4.8%, 4.2%, and 91%, the temperature of the electronic igniter reached 250°C, and the igniter was turned off 10 minutes after the start of air injection. After 6.2 hours of reaction, the oil sample was taken and its viscosity at 50°C was measured to be 4924.74mPa·s, and the gas CO was produced 2 , O 2 , N 2 The average content of CO and CO components are: 9.5%, 1.2%, 83.1%, 3.6%, H / C atomic ratio and CO / (CO+CO 2 ) ratios were 2.45 and 0.3, and the average combustion temperature was 484.5°C. There was almost no low-temperature oxidation reaction during the experiment. The oil recovery rate in the combustion tube is 72.1%, and the average front velocit...

Embodiment 2

[0021] In the experiment, a combustion tube was used to add heavy oil from an oil field (viscosity at 50°C: 12120.53mPa·s), and at the same time, 0.25wt% catalyst nickel acetylacetonate and 5% tetralin were added to the heavy oil mass, and the air injection speed was 3L / min , the production pressure is 2.1 MPa, the mass percentages of oil, water and sand in the rock sample are 4.8%, 4.2%, and 91% respectively, the temperature of the electronic igniter reaches 250°C, and the igniter is turned off 10 minutes after the air injection starts. After 6.2 hours of reaction, the oil sample was taken and its viscosity at 50°C was measured to be 3628.42mPa·s, and the gas CO was produced 2 , O 2 , N 2 The average content of CO and CO components were 10.7%, 0.5%, 82.0%, 3.6%, respectively, O 2 Lower concentrations indicate higher combustion efficiency than the first set of experiments. The average H / C atomic ratio and CO / (CO+CO2) ratio were 2.95 and 0.32, respectively. The average comb...

Embodiment 3

[0023] In the experiment, a combustion tube was used to add heavy oil from an oil field (viscosity at 50°C: 12120.53mPa·s), and at the same time, 0.5wt% catalyst iron acetylacetonate and 5% tetralin were added to the heavy oil mass, and the air injection speed was 3L / min , the production pressure is 2.1 MPa, the mass percentages of oil, water and sand in the rock sample are 4.8%, 4.2%, and 91% respectively, the temperature of the electronic igniter reaches 250°C, and the igniter is turned off 10 minutes after the air injection starts. After 6.2 hours of reaction, the oil sample was taken and its viscosity at 50°C was measured to be 2221.05mPa·s, and the gas CO was produced 2 , O 2 , N 2 The average contents of CO and CO components were 12.45%, 1.2%, 82.5%, and 4.0%, respectively. Average H / C atomic ratio and CO / (CO+CO 2 ) ratios are 2.95 and 0.32, respectively. The average combustion temperature is 492°C, the average front velocity is 0.283cm / min, faster than the first gr...

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Abstract

The invention belongs to the technical field of heavy oil recovery and provides a modification and viscosity reduction method for in-situ combustion heavy oil recovery. The modification and viscosity reduction method comprises adding heavy oil and a mixture of a catalyst and a hydrogen donor to a combustion tube simultaneously and injecting air and igniting; turning off an igniter after the air is injected for 8 to 12 minutes and reacting for 5 to 7 hours; enabling the reaction formula of the high temperature oxidation process to be as follows. The modification and viscosity reduction method for the in-situ combustion heavy oil recovery has the advantages of reducing the viscosity and density of the heavy oil to enabling the heavy oil to meet the mining and or gathering and transportation requirements; reducing the recovery and gathering and transportation cost due to a hydrogen catalytic chemical system; being wide in applicability and being applicable to different oil fields and different viscosity ranges of heavy oil; being capable of increasing the H/C (Hydrogen/Carbon) atomic ratio due to chemical agents and capable of reducing the water production rate to a certain extent and improving the quality of the heavy oil; enabling metal additives to be introduced to change dynamical characteristics of oxidation reaction and having the effect of fuel deposition.

Description

technical field [0001] The invention belongs to the technical field of heavy oil exploitation, in particular to a method for modifying and reducing the viscosity of heavy oil in the exploitation of heavy oil by burning oil layers. Background technique [0002] Heavy oil refers to degassed crude oil with a viscosity greater than 100mPa·s at the oil layer temperature. According to the viscosity, heavy oil can be further divided into ordinary heavy oil (50 ~ 10000mPa · s), extra heavy oil (10000 ~ 50000mPa · s), super heavy oil (10000 ~ 50000mPa · s), Heavy oil (above 50000mPa.s). Crude oil with a relative density greater than 0.92. In foreign countries, it is generally called heavy oil (including tar sands and soft asphalt), which belongs to unconventional oil resources. At present, thermal oil recovery is the main method to reduce the viscosity of heavy oil by heating underground oil reservoirs. The required heat energy is generated on the ground and injected into the rese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/243E21B43/22
Inventor 赵法军魏建光刘永建殷代印刘维凯耿志刚
Owner NORTHEAST GASOLINEEUM UNIV
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