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Steam injection, air injection and production well gas-fire stimulation combined oil extraction method

A gas-fired huff and puff technology for production wells, which is applied in the fields of steam injection combined with air injection and gas-fired huff and puff oil production in production wells, and can solve problems such as uneven effectiveness, low air flooding efficiency, and single gas injection inrush.

Inactive Publication Date: 2016-11-09
中嵘能源科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for low-permeability reservoirs, heavy oil reservoirs, ultra-heavy oil reservoirs, and high-wax oil reservoirs, when air flooding is used for oil production, there will be situations such as single gas injection, uneven effect, and low air flooding efficiency.

Method used

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  • Steam injection, air injection and production well gas-fire stimulation combined oil extraction method

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Effect test

Embodiment 1

[0025] A steam injection combined with air injection and production well gas huff and puff oil recovery method, comprising: 1. According to the requirements of gas injection at high positions and oil production at low positions, the gas injection wells (1 ) and production wells (2) for well layout; 2. Carry out high-pressure gas injection completion for the gas injection well (1), inject 260 tons of 280°C high-temperature steam into the gas injection well (1) to increase the temperature of the formation, and establish a temperature field, After the formation is warmed up and preheated, air is injected into the gas injection well (1) for ignition, and the air flooding oil production starts; 3. After 3 months of the air flooding oil production, the production well (2) gas fire huff and puff (7) process starts: First inject 100 tons of 130°C high-temperature hot water into the production well (2), and then inject 150,000 cubic meters of air according to the formation parameters. A...

Embodiment 2

[0027] A steam injection combined with air injection and production well gas huff and puff oil recovery method, comprising: 1. According to the requirements of gas injection at high positions and oil production at low positions, the gas injection wells (1 ) and production wells (2) for well layout; 2. Carry out high-pressure gas injection completion for the gas injection well (1), inject 200 tons of 300°C high-temperature steam into the gas injection well (1) to increase the temperature of the formation, and establish a temperature field, After the formation is warmed up and preheated, air is injected into the gas injection well (1) for ignition, and the air flooding oil production starts; 3. After 3 months of the air flooding oil production, the production well (2) gas fire huff and puff (7) process starts: First inject 80 tons of 150°C high-temperature hot water into the production well (2), and then inject 200,000 cubic meters of air according to the formation parameters. Af...

Embodiment 3

[0029] A steam injection combined with air injection and production well gas huff and puff oil recovery method, comprising: 1. According to the requirements of gas injection at high positions and oil production at low positions, the gas injection wells (1 ) and production wells (2) for well layout; 2. Carry out high-pressure gas injection completion for the gas injection well (1), inject 180 tons of 320°C high-temperature steam into the gas injection well (1) to increase the temperature of the formation, and establish a temperature field, After the formation is warmed up and preheated, air is injected into the gas injection well (1) for ignition, and the air flooding oil production starts; 3. After 3 months of the air flooding oil production, the production well (2) gas fire huff and puff (7) process starts: First inject 80 tons of 150°C high-temperature hot water into the production well (2), and then inject 300,000 cubic meters of air according to the formation parameters. Af...

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Abstract

The invention discloses a steam injection, air injection and production well gas-fire stimulation combined oil extraction method. Aiming at problems of gas injection single onrush, effect nonuniformity, low air injection displacement efficiency and the like resulted from fingering and gas channeling due to influences of formation heterogeneity and high seepage velocity of air in stratums in air injection displacement type oil extraction of existing low-permeability reservoirs, heavy oil reservoirs, high-wax-content oil reservoirs and the like, the steam injection, air injection and production well gas-fire stimulation combined oil extraction method is adopted for steam injection for blockage removal and migration regulation of gas injection wells, gas-fire stimulation is adopted for stimulation to solve the problem of effect nonuniformity of production wells, reverse high-temperature pyrolysis belts can be formed underground, and continuous passages are formed between the production wells and the gas injection wells. In addition, short soak time is realized, and oil extraction speed and oil extraction efficiency are increased while the problems of gas injection single onrush, effect nonuniformity and the like are solved.

Description

technical field [0001] The invention relates to oil recovery methods for low-permeability oil reservoirs, heavy oil reservoirs, super-heavy oil reservoirs, and high-wax oil reservoirs, in particular to steam injection combined with air injection and production well gas-fire huff and puff oil recovery techniques, and belongs to the field of petroleum exploitation. Background technique [0002] At present, air flooding is mostly used in the field of oil extraction. The difference between air flooding and other oil recovery methods is that after the air enters the oil layer, the oxygen part reacts with the crude oil to crack the crude oil, and the macromolecular chain breaks to form small molecules. The heavy chain is split into various aromatic hydrocarbons, alcohols and various light components, and a large amount of carbon dioxide is produced. The dissolution of carbon dioxide in crude oil enhances the fluidity of crude oil, and the remaining nitrogen in the air accumulates i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16E21B43/24E21B43/247E21B43/20
CPCE21B43/168E21B43/20E21B43/24E21B43/247
Inventor 邓晓亮洪兆
Owner 中嵘能源科技集团有限公司
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