Layered ignition device for in-situ combustion

Abstract

The invention discloses a layered ignition device for in-situ combustion. According to the layered ignition device for the in-situ combustion, an electric ignition device is arranged in a cavity of a Pupping oil pipe, an insulated pipe sleeves the Pupping oil pipe, and a casing sleeves the insulated pipe; the electric ignition device comprises an electric igniter cable and an electric igniter heating section, and the electric igniter cable is connected with a power supply; a first annular space forms between the casing and the insulated pipe; a second annular space forms between the insulated pipe and the Pupping oil pipe; a first packer and a second packer are arranged in the first annular space at intervals, and an upper gas filling space remains between the first packer and the second packer; an upper gas distribution device located in the upper gas filling space is arranged on the insulated pipe; a reinforced heat transfer device comprises a winding section and two contact sections; when the temperature of the Pupping oil pipe is lower than a preset value, the reinforced heat transfer device integrally winds the Pupping oil pipe, and when the temperature of the Pupping oil pipe is larger than or equal to the other preset value, the contact sections are supported to contact with the insulated pipe.

Description

technical field [0001] The present invention relates to a combustion oil layer ignition technology, in particular, relates to a combustion oil layer layered ignition device. Background technique [0002] At present, the ignition technologies commonly used in heavy oil reservoirs mainly include steam injection spontaneous ignition, steam injection + chemical agent combustion-assisted ignition, and mobile electric ignition. However, some blocks in the fire-burning oil layer are multi-layer fires, and layered ignition and gas injection are required. Due to the limited space of the pipe string for layered injection, it is impossible to implement layered ignition with a mobile electric igniter. Therefore, the layered ignition on site The main methods are steam injection spontaneous ignition and steam injection + chemical agent combustion-assisted ignition. However, these two ignition methods have the following problems: the success rate of ignition is not high. Because the rema...

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Problems solved by technology

However, these two ignition methods have the following problems: the success rate of ignition is not high

Because the remaining oil saturation near the wellbore is low and the water content is high, at the initial stage of ignition, the water evaporates and takes away a large part of the heat, and the temperature of the oil layer reaching the ignition point is 360°C to 420°C. Therefore, long-term low-temperature oxidation is required to achieve this Due to the long time of low-temperature oxidation (the heat generated by low-temperature oxidation < the heat absorbed by the formation + the heat taken away by the air), some oil wells failed to reach the ignition point temperature of the oil layer. If the oil layer after the fire is re-ignited, the difficulty will be Greatly increased, and if the two layers are not lit at the same time, the follow-up operation will be more difficult

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