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Oil reservoir fire-flooding thermal-ignition method

A technology for thermal ignition and oil formation, which is applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc. It can solve the problems of burning out the heater at heating temperature and low success rate of chemical ignition of combustion accelerants.

Inactive Publication Date: 2007-07-11
LIAOHE GASOLINEEUM EXPLORATION BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a thermal ignition method for fire flooding oil recovery oil layer, which solves the problems in the prior art that the heating temperature is too high and the heater is easily burned out, and the ignition success rate of the chemical method of the combustion aid is very low.

Method used

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Embodiment 1

[0006] The method of thermal ignition of fire flooding production oil layer is to adopt the movable skid-mounted gas-steam generator complete set, and use the high temperature and high pressure combustion technology to burn the mixed gas such as nitrogen, carbon dioxide and water vapor and a large amount of heat energy produced by the combustion of diesel oil. - When the combustion temperature in the steam generator reaches 1800°C, mix water to cool down to 300-400°C, and the pressure is less than 25MPa, inject the mixed gas into the oil layer through the wellhead device and injection pipe string of the oil well; inject 3-10×10 4 N m 3 The mixed gas at 300-400°C preheats the oil layer, and then continuously injects air into the well to oxidize the crude oil and air in the oil layer, release heat, reach the spontaneous ignition point, and burn to achieve the purpose of burning the oil layer to drive oil.

Embodiment 2

[0008] The thermal ignition method of the fire flooding production oil layer is suitable for the well layout method adopted by the well pattern of the existing oil field, and one well is injected into multiple wells to produce oil; the movable skid-mounted gas-steam generator set used in this method: the output gas capacity is 1- 3t / h, temperature 300-400℃, pressure less than 25MPa; with this method, after the oil layer is ignited, the gas injection front monitor used on the ground can be used to detect the microseisms generated by the interaction between the air and crude oil in the formation, and it can be judged that The burning range of the formation and the burning direction.

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Abstract

The invention relates to a thermal igniting method in fire-flooding oil recovery reservoir for ignition in fire-flooding oil recovery reservoir in oilfield and oil well. An active prying gas-steam generator system is used to burn diesel oil to generate mixed air with nitrogen air, carbon dioxide and water steam so on and a mass of heat energy by high-temperature high-pressure burning technology. When the burning temperature in gas-steam generator achieves 1800DEG C, temperature is fallen to 300-400DEG C by mixing water and the pressure is less than 25MPa. The mixed air injects into reservoir by wellhead equipment of oil well and injection tube. The mixed air with the temperature of 300-400DEG C and the cubage of 3-10*104Nm3 is injected to preheat the reservoir and air is injected in the well continuously. In reservoir, the crude oil and the air generate oxygenation to discharge heat. The self-burning point is achieved and burning happens so that the purpose of flooding by combustion. The method solves following problems that the heater is destroyed easily because of over high heating temperature in prior technology and the successful ignition by chemical method is low. The invention can be widely applied in ignition in fire-flooding oil recovery reservoir in oilfield and oil well.

Description

Technical field: [0001] The invention relates to a thermal ignition method for fire-flooding oil-producing oil layers used for ignition of oil-field oil-well fire-flooding oil-producing oil layers. Background technique: [0002] At present, fire flooding is one of the displacement methods in oil production in oil fields. It uses crude oil in the oil layer as fuel to burn with the air injected into the oil layer to generate heat, increase the pressure of the formation, and replace the crude oil in the formation to the bottom of the well. In the prior art, ignition methods for medium fire flooding production oil layers include a heater method, a combustion enhancer chemical method and a steam injection method. The heater method is to use the cable to send the heater into the oil well to heat the injected air. This method has the disadvantage that the injected air cannot fully contact the heater, which often results in uneven heat absorption of the air, and sometimes causes the...

Claims

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Application Information

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IPC IPC(8): E21B43/24
Inventor 朱玉瑰宁奎张成军张弘韬孙希勇蔡佳荣
Owner LIAOHE GASOLINEEUM EXPLORATION BUREAU
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