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

A technology for production wells and oil fields, which is applied in the field of reinjection of associated tail gas from production wells in fire flooding oilfields, can solve problems such as environmental pollution and waste of associated tail gas resources in oil fields, and achieve the goals of overcoming environmental pollution, low composition requirements, and strong applicability Effect

Inactive Publication Date: 2019-04-26
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Embodiment Construction

[0032] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0033] The invention provides a method for increasing production by using the associated tail gas of the production well of the fire flooding oilfield to reinject into the oil layer. The method of generating gas is the prior art, and will not be repeated here; in order to achieve a better production stimulation effect, the temperature range of the thermal fluid re-injected into the reservoir formation is 120 ° C to 180 ° C, in a specific embodiment of the present invention , the temperature of the thermal fluid is 156°C. Then inject the thermal fluid back into the reservoir formation to complete the reservoir stimulation.

[0034] In the method for increasing production by using the associated tail gas of the production well of ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16F23G7/06
CPCE21B43/16E21B43/168F23G7/06F23G2209/14
Inventor 尹长海马春宝王德伟马子健李明峰高玉军贾财华段效威刘长环陶维维高华孙强
Owner PETROCHINA CO LTD
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