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Method for exploiting thickened oil or asphalt

A bitumen, heavy oil technology, applied in the fields of fluid production, earthmoving, wellbore/well components, etc., can solve problems such as unstoppable, expensive, heat loss in thin oil reservoirs, etc.

Inactive Publication Date: 2014-07-23
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010]2. In thin oil reservoirs, the heat will be lost to adjacent layers, and it is not suitable for steam injection method
However, drilling an additional well is expensive and does not prevent another coke wall layer from forming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In the experiment, a combustion tube was used to add heavy oil (viscosity of 14380.24mPa·s at 50°C) from an oilfield, no chemical additives were added, the air injection rate was 4L / min, the production pressure was maintained at 2.5MPa, 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. The oil sample was taken after 6.5 hours of reaction, and its viscosity at 50°C was measured to be 5462.32mPa·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%, respectively. During the experiment, there is almost no low-temperature oxidation reaction. The oil recovery rate in the combustion tube reaches 70.5%, and the average front velocity is 0.225cm / min.

Embodiment 2

[0040] In the experiment, heavy oil (viscosity at 50°C is 14380.24mPa·s) was added from a certain oil field using a combustion tube, and 0.5wt% ammonia gas of heavy oil quality was added at the same time, the air injection rate was 3L / min, and the production pressure was 2.3MPa. The mass percentages were 4.8%, 4.2%, and 91%, respectively, the temperature of the electronic igniter reached 250°C, and the igniter was turned off 10 minutes after the start of air injection. After 6.5 hours of reaction, the oil sample was taken and its viscosity at 50°C was measured to be 986.58mPa·s, and the gas CO was produced. 2 , O 2 , N 2 The average content of CO and CO components were 12.45%, 1.0%, 82.5%, 4.0%, respectively, O 2 The concentration is lower, indicating that the combustion efficiency is higher than that of the first group of experiments, the average front velocity is 0.289cm / min, higher than the first group of experiments, and the oil recovery rate is 91.2%.

Embodiment 3

[0042] In the experiment, a combustion tube was used to add heavy oil from an oil field (viscosity at 50°C: 14380.24mPa·s), and at the same time add 0.5wt% ethylamine to the heavy oil mass, the air injection rate was 3L / min, the production pressure was 2.2MPa, and the mass of oil, water and sand in the rock sample The percentages were 4.8%, 4.2%, and 91%, respectively. The temperature of the electronic igniter reached 250°C, and the igniter was turned off 10 minutes after the start of air injection. The oil sample was taken after 6.5 hours of reaction, and its viscosity at 50°C was measured to be 2428.32mPa·s, and the gas CO was produced 2 , O 2 , N 2 The average content of CO and CO components were 10.96%, 0.54%, 82.38%, 3.8%, respectively, O 2 The concentration is low, the average front velocity is 0.279cm / min, faster than the first group of experiments, and the oil recovery rate is 86.25%.

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Abstract

The invention provides a method for exploiting thickened oil or asphalt. The method for exploiting the thickened oil or asphalt comprises the steps that steam is injected into a stratum, and then air and an alkali compound are injected so that the air and the alkali compound can enter an underground reservoir stratum. According to the method for exploiting the thickened oil or asphalt, flowing of the thickened oil or asphalt in the reservoir stratum can be promoted. The method for exploiting the thickened oil or asphalt further comprises the steps that a combustion front is established in part of the thickened oil or asphalt in the reservoir stratum through combustion of oil in-situ, air and the alkali compound are injected into the stratum during combustion of oil in-situ, and the alkali compound makes contact with hydrocarbons at the position of the combustion front and reacts with naphthenic acid in the hydrocarbons so that a surface active agent can be formed.

Description

technical field [0001] The invention relates to a method for exploiting heavy oil or asphalt, in particular to a method for exploiting heavy oil or asphalt from an underground oil layer by burning the oil layer. Background technique [0002] Due to the rapid economic growth in most developing countries and the increasing demand for crude oil, people have gradually turned their attention to unconventional oil resources. Heavy oil, bitumen, is known as an unconventional resource because unconventional methods are required to bring it to the surface. [0003] Heavy oil reservoirs include highly viscous crude oil, bitumen, etc., which cause transportation and processing problems due to their high viscosity and low mobility. In order to improve the fluidity of such reservoirs, it is necessary to reduce the viscosity of crude oil. Thermal oil recovery methods such as steam flooding, steam assisted gravity drainage (SAGD), steam huff and puff, and burning oil layers are all enhan...

Claims

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Application Information

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IPC IPC(8): E21B43/22E21B43/24E21B43/243
Inventor 赵法军刘永建魏建光闻守斌刘维凯冯进来
Owner NORTHEAST GASOLINEEUM UNIV
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