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
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[0024] Example 1
[0025] An oxygen-enriched spontaneous ignition ignition method for an air drive reservoir includes the following steps: Step 1. Perform completion operations on a gas injection well and inject cement to block the oil zone; Step 2. Re-perforate after the cement has hardened, respectively. The bottom of the oil layer is 2m, the middle is 0.8m, and the upper is 1m; Step 3. Perform a nitrogen pressure test. The pressure test range is 3m near the well pipe and wellbore, and a casing gas is formed to isolate combustible materials; Step 4. Pass the boiler The truck injects 120 tons of hot water at 150°C into the wellbore to warm the formation; injects 0.1PV of oxygen-rich mixture into the formation to ignite the formation spontaneously. The oxygen-rich mixed gas is composed of 70% oxygen and 30% nitrogen according to mass percentage. Among them, the completion operations include: when the well is completed, the sequence of the components into the well is trumpet, pac...
Example Embodiment
[0026] Example 2
[0027] An oxygen-enriched spontaneous ignition ignition method for an air drive reservoir includes the following steps: Step 1. Perform completion operations on a gas injection well and inject cement to block the oil zone; Step 2. Re-perforate after the cement has hardened, respectively. The bottom of the oil layer is 3m, the middle is 1m, and the upper is 1m; Step 3. Perform a nitrogen pressure test, the pressure test range is 4m near the well pipe and the wellbore, and a casing gas is formed to isolate combustible materials; Step 4. Pass the boiler car Inject 150 tons of 160℃ hot water into the wellbore to warm the formation; inject 0.15PV of oxygen-rich gas mixture into the formation to ignite the formation spontaneously. The oxygen-rich mixed gas is composed of 70% oxygen and 30% nitrogen according to mass percentage. Among them, the completion operation includes: when the well is completed, the sequence of the components into the well is the bell mouth, p...
Example Embodiment
[0028] Example 3
[0029] An oxygen-enriched spontaneous ignition ignition method for an air drive reservoir includes the following steps: Step 1. Perform completion operations on a gas injection well and inject cement to block the oil zone; Step 2. Re-perforate after the cement has hardened, respectively. The bottom of the reservoir is 3.5m, the middle is 1m, and the upper is 1.2m; Step 3. Perform a nitrogen pressure test. The pressure test range is 4.5m near the well pipe and wellbore, and a casing gas is formed to isolate combustible materials; Step 4. Inject 200 tons of 150℃ hot water into the wellbore through the boiler car to increase the formation temperature; inject 0.2PV of the oxygen-rich mixed gas into the formation to ignite the formation spontaneously. The oxygen-rich mixed gas is composed of 60% oxygen and 40% nitrogen according to mass percentage. Among them, the completion operation includes: when the well is completed, the sequence of components running into the...
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