Exploitation method and injection system for oil reservoir of super heavy oil

Abstract

The invention provides an exploitation method and an injection system for an oil reservoir of super heavy oil. The exploitation method includes that steps that an injection-production pattern is deployed; solvent and superheated steam are injected into an injection well simultaneously; after a steam chamber extends to the top of an oil layer, the solvent, non-condensate gas and the superheated steam are injected into the injection well simultaneously, when the solvent and the superheated steam are injected into a well simultaneously, a producing well extracts oil continuously until the production is finished. The injection system comprises hydrogen donor visbreaking in-place modification equipment, a superheated steam injection device and associated gas separation recovery equipment, which are connected with the injection well respectively; the superheated steam injection device comprises a sewage treatment station, membrane treatment equipment, an MVC water treatment station and a drum boiler, wherein the sewage treatment station, the membrane treatment equipment and the drum boiler are communicated with one another in sequence, and the MVC water treatment station is communicated with the membrane treatment equipment and the drum boiler. The exploitation method and the injection system for the super heavy oil reservoir can reduce heat losses, and the exploitation effect and the economic benefit of the super heavy oil reservoir are greatly improved.

Description

technical field [0001] The invention provides a mining method and an injection system for an ultra-heavy oil reservoir, in particular to a solvent and gas-assisted steam efficient oil drainage extraction method and an injection system for an ultra-heavy oil reservoir, and belongs to the technical field of petroleum exploitation. Background technique [0002] 18.2% of the geological reserves in my country's heavy oil fields are ultra-heavy oil, usually the viscosity of degassed crude oil is greater than 50000mPa·s at the oil layer temperature, and the relative density of crude oil is greater than 1.00g / cm 3 , cannot flow under formation conditions. Based on the above reasons, super-heavy oil reservoirs can only be exploited by steam injection heating and viscosity-reducing production technology. Currently, more mature production methods include steam huff and puff, steam flooding and steam-assisted gravity drainage (SAGD) production methods. [0003] Among them, SAGD is a cu...

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Problems solved by technology

[0004] However, there are many deficiencies in the traditional SAGD production method. For example, during the SAGD production process, high-dryness steam is continuously injected. Since the expansion of the steam chamber is mainly through the heat exchange between the steam chamber and the crude oil, it is discharged into the steam chamber under the action of gravity. The oil velocity is slow, and it takes 3-5 years for the oil well to reach the peak production; in the SAGD production method, with the continuous production of crude oil, the steam chamber gradually expands, because when the steam chamber expands to the top of the oil layer, it heats the overlying strata, causing Ineffective waste of heat, while maintaining a larger steam chamber requires more steam, which will inevitably result in a significant reduction in economic benefits

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