Air drive reservoir oxygen-enriched gas injection spontaneous ignition method

An air flooding and oxygen-enriching technology, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of low ignition efficiency and slow ignition speed, reduce the probability of accidents, improve injection efficiency, The effect of speeding up the reaction speed

Inactive Publication Date: 2016-10-26
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, there are problems such as slow ignition speed and low ignition efficiency in the spontaneous ignition ignition method in the prior art.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for injecting oxygen-enriched spontaneous combustion into an air flooding oil reservoir, comprising the following steps: Step 1. Carry out well completion operation on the gas injection well, and inject cement to plug the oil zone; Step 2. Re-perforate after the cement hardens, respectively 2m from the bottom of the oil layer, 0.8m from the middle, and 1m from the top; step 3. Carry out nitrogen pressure test, the pressure test range is 3m near the well pipe and the wellbore, and form casing protection gas to isolate combustible substances; step 4. Pass the boiler The truck injects 120 tons of 150°C hot water into the wellbore to increase the temperature of the formation; injects 0.1PV of oxygen-rich mixed gas into the formation to spontaneously ignite the formation. The oxygen-enriched gas mixture consists of 70% oxygen and 30% nitrogen by mass percentage. Among them, the completion operation includes: when completing the well, the components that are lowered ...

Embodiment 2

[0027] A method for injecting oxygen-enriched spontaneous combustion into an air flooding oil reservoir, comprising the following steps: Step 1. Carry out well completion operation on the gas injection well, and inject cement to plug the oil zone; Step 2. Re-perforate after the cement hardens, respectively 3m from the bottom of the oil layer, 1m from the middle, and 1m from the top; Step 3. Carry out nitrogen pressure test, the pressure test range is 4m near the well pipe and the wellbore, and form casing protection gas to isolate combustible substances; Step 4. Pass the boiler car Inject 150 tons of 160°C hot water into the wellbore to increase the temperature of the formation; inject 0.15 PV of oxygen-rich mixed gas into the formation to ignite the formation spontaneously. The oxygen-enriched gas mixture consists of 70% oxygen and 30% nitrogen by mass percentage. Among them, the completion operation includes: when completing the well, the components that are lowered into the...

Embodiment 3

[0029] A method for injecting oxygen-enriched spontaneous combustion into an air flooding oil reservoir, comprising the following steps: Step 1. Carry out well completion operation on the gas injection well, and inject cement to plug the oil zone; Step 2. Re-perforate after the cement hardens, respectively 3.5m from the bottom of the oil layer, 1m from the middle, and 1.2m from the top; step 3. Carry out nitrogen pressure test, the pressure test range is 4.5m near the well pipe and the wellbore, and form casing protection gas to isolate combustible substances; step 4. Inject 200 tons of 150°C hot water into the wellbore by the boiler truck to increase the temperature of the formation; inject 0.2 PV of oxygen-enriched mixed gas into the formation to spontaneously ignite the formation. The oxygen-enriched gas mixture consists of 60% oxygen and 40% nitrogen by mass percentage. Among them, the completion operation includes: when completing the well, the components that are lowered...

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PUM

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Abstract

The invention relates to an air drive reservoir oxygen-enriched gas injection spontaneous ignition method. Aiming at the problems that a spontaneous ignition method in the prior art is low in ignition speed, low in ignition efficiency and the like, well completion practice, upper, middle and lower perforation and addition of high-temperature hot water and oxygen-enriched mixed gas are carried out on a gas injection well, so that efficient ignition is achieved, safety is high, and the method can be used for ignition of thick oil, thin oil and low-permeability reservoirs.

Description

technical field [0001] The invention relates to a method for injecting oxygen-enriched spontaneous combustion into an air-flooding oil reservoir, and belongs to the field of oil production by air injection in an oil field. Background technique [0002] The air flooding technology uses the heavy and colloidal part of the crude oil in the formation as fuel, and adopts an oxygen-enriched chemical reaction to spontaneously ignite and ignite the oil layer. Add part of the combustion aid to make the crude oil in the oil layer continue the high-temperature chemical cracking reaction. The high-temperature cracking reaction generates heat, and the oil layer is heated to make the temperature of the oil layer rise to 350-600°C. The heavy component undergoes a cracking reaction at a high temperature, and the injected gas and the heavy oil are cracked. The reaction generates condensate oil and flue gas, and the flue gas and water vapor multi-phase miscible gas form the power to drive the...

Claims

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Application Information

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IPC IPC(8): E21B43/243
CPCE21B43/243
Inventor 邓晓亮洪兆
Owner 中嵘能源科技集团有限公司
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