Method for increasing yield by carrying out reinjection on oil layer by utilizing fire flood oil field production well associated tail gas

Abstract

The invention relates to a method for increasing the yield by carrying out reinjection on an oil layer by utilizing fire flood oil field production well associated tail gas. The method comprises the following steps that the collected fire flood oil field production well associated tail gas is combusted and converted into thermal fluid through a combustor structure, and then the thermal fluid is reinjected into an oil reservoir stratum so as to complete yield increase of an oil reservoir. The method has the advantages that the problems of resource waste, environmental pollution and the like ofoil field associated tail gas existing in the prior art can be solved, the fire flood oil field production well associated tail gas can be converted into the multi-element thermal fluid capable of being reinjected into the stratum, the thermal fluid is injected into the oil reservoir stratum so as to realize yield increase, and the recovery and utilization of the oil field production well associated gas are realized.

Description

technical field [0001] The invention relates to the technical field of oil field exploitation, in particular to a method for increasing production by using the associated exhaust gas from a production well in a fire flooding oil field to reinject into an oil layer. Background technique [0002] Oilfield associated tail gas is the gas that cannot be directly used when it is discharged with petroleum liquid during oilfield exploitation. When using fire flooding, steam flooding or gas flooding (such as CO 2 In the process of exploiting oil with EOR technology such as flooding), the methane gas contained in the oil will be discharged together with the oil and gas, and become the associated gas in the oilfield exploitation process. The associated gas with high concentration (>30% vol) can be directly or Indirect utilization, and associated gas with low content (generally containing 1-10% vol of methane) cannot be directly burned and utilized, and most of them are directly ven...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for increasing production by using the associated tail gas of the fire flooding oil field production well to reinject the oil layer, which overcomes the problems of waste of oil field associated tail gas resources and environmental pollution in the prior art. The associated tail gas is converted into a multi-component thermal fluid that can be reinjected into the formation, injected into the reservoir formation to increase production, and realize the recovery and utilization of associated gas in oilfield production wells

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