Method for extracting oil by injecting foam air and oxygen-enriched pyrolysis thermochemical composite air into oil reservoir in flooding mode

An air flooding and foam technology, applied in chemical instruments and methods, production fluids, earthwork drilling, etc., can solve the problems of poor foam stability, hindering popularization and application, short half-life of foam fluids, etc., and achieves short reaction period and high oil recovery rate. , the effect of high pyrolysis temperature

Active Publication Date: 2017-05-17
中嵘能源科技集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Foam fluids have been used in oil fields for more than 40 years at home and abroad. In order to prevent premature gas channeling caused by too low viscosity of gas injection, the initial foam flooding was simply treated with an aqueous solution of oily agent, but in In practice, due to the poor stability of conventional foam, its popularization and application are hindered. Air foam flooding technology is a new technology for tertiary oil recovery developed on the basis of conventional foam flooding and air injection. Its main principle is that air injection During air flooding, low-temperature oxidation reaction occurs, tail gas is generated, and multi-phase miscible gas flooding is formed. In addition to t...

Method used

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  • Method for extracting oil by injecting foam air and oxygen-enriched pyrolysis thermochemical composite air into oil reservoir in flooding mode
  • Method for extracting oil by injecting foam air and oxygen-enriched pyrolysis thermochemical composite air into oil reservoir in flooding mode
  • Method for extracting oil by injecting foam air and oxygen-enriched pyrolysis thermochemical composite air into oil reservoir in flooding mode

Examples

Experimental program
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Effect test

Embodiment 1

[0041]Injecting foamy air and oxygen-enriched pyrolysis composite air flooding oil recovery method into the oil layer:

[0042] 1. Foam injection stage: Mix the foaming agent and water evenly to prepare a foam solution. The foaming agent must be avoided during the mixing process, and the foam solution is injected into the formation through the gas injection well. After the foam solution is injected, air is injected, and the foam starts to foam during the process of pushing the foam solution into the cracks of the oil layer, and the cracks and pores in the oil layer are blocked. The concrete composition of foam solution and percentage mass ratio in the aqueous solution are: sulfonate dioctyl succinate sodium sulfonate 3.5% and dodecylbenzene sodium sulfonate 5%, thickener 6501 (coconut oil fatty acid Diethanolamide) 5%, chelating agent sodium silicate 1.5%, sacrificial agent hydroxysuccinic acid 2%, alcohols ethylene glycol 1.5%, and the balance is clear water.

[0043] 2. Oxy...

Embodiment 2

[0046] Compared with Example 1, the difference is that the specific composition of the foam solution in step 1 and the percentage mass ratio in the aqueous solution are: sulfonate dioctylsuccinate sodium sulfonate 3.2% and dodecylbenzenesulfonic acid Sodium 4.5%, thickener 6501 (coconut oil fatty acid diethanolamide) 4.5%, chelating agent sodium silicate 1.2%, sacrificial agent hydroxysuccinic acid 1.5%, alcohol ethylene glycol 1.2%, and the balance is clear water.

Embodiment 3

[0048] Compared with Example 1, the difference is that the specific components of the foam solution in step 1 and the percentage mass ratio in the aqueous solution are: sulfonate dioctylsuccinate sodium sulfonate 3.8% and dodecylbenzenesulfonic acid Sodium 5.5%, thickener 6501 (coconut oil fatty acid diethanolamide) 5.6%, chelating agent sodium silicate 1.9%, sacrificial agent hydroxysuccinic acid 2.6%, alcohol ethylene glycol 1.8%, and the balance is clear water.

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Abstract

The invention discloses a method for extracting oil by injecting foam air and oxygen-enriched pyrolysis thermochemcial composite air into an oil reservoir in a flooding mode. The method comprises the steps that in the first injection step, a foaming agent is injected into the oil reservoir so as to generate foam; in a second injection step, an oxygen-enriched air mixture is injected subsequently, and ignition is conducted on a stratum; and subsequently, the air is injected for oil displacement production. Large pore paths can be blocked by the foam, water is blocked while oil is not blocked, and hypertonic pore paths are sealed; and since the foam and the air are alternately injected, gas channeling can be effectively prevented, the purposes of modifying and flooding can be achieved, residual oil can be better displaced, communication of areas unswept by injected water is achieved, and the crude oil displacement and sweeping efficiency are improved. The foaming agent is an anionic surfactant with high activity, and can be used for lowering oil-water interfacial tension greatly, improving the wettability of the surface of rock and improving the displacement efficiency of an injectant, and accordingly the purpose of increasing the recovery ratio is achieved. Advantages of the technologies of foam flooding and air flooding are fully achieved, the sweeping coefficient is increased more efficiently, and the displacement efficiency is improved more efficiently.

Description

technical field [0001] The invention relates to an oil recovery technology of injecting foamy air and oxygen-enriched high-temperature pyrolysis thermochemical composite air flooding into an oil layer, belonging to the field of oil recovery engineering. Background technique [0002] Foam fluid has been used in oilfields for more than 40 years at home and abroad. In order to prevent premature gas channeling caused by too low viscosity of gas injection in the initial foam flooding, it was simply treated with oily agent aqueous solution, but in In practice, due to the poor stability of conventional foam, its popularization and application are hindered. Air foam flooding technology is a new technology for tertiary oil recovery developed on the basis of conventional foam flooding and air injection. Its main principle is that air injection During air flooding, low-temperature oxidation reaction occurs, tail gas is generated, and multi-phase miscible gas flooding is formed. In addi...

Claims

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Application Information

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IPC IPC(8): E21B43/22E21B43/243E21B43/241C09K8/506C09K8/518
CPCC09K8/506C09K8/518E21B43/16E21B43/241E21B43/243
Inventor 邓晓亮栾天
Owner 中嵘能源科技集团有限公司
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