Chemical auxiliary ignition agent and ignition method for low-temperature heavy-oil reservoir

Abstract

The invention discloses a chemical auxiliary ignition agent and ignition method for a low-temperature heavy-oil reservoir. The chemical auxiliary ignition agent is prepared from, by mass, 50-65% of areducing agent, 10-15% of an oxidant, 20-35% of a catalyst and 5-15% of other components. A chemical auxiliary ignition technique is adopted for in-situ oil combustion exploitation of the low-temperature heavy-oil reservoir, and by adding of the reducing agent, combustible components can be increased while initial ignition energy can be provided; by adding of the oxidant, combustion can be intensified, and redox reaction is accelerated; by adding of the catalyst, oxidation reaction activation energy can be reduced, the oxygen consumption rate is increased while fuel deposition is changed, coking zone reduction is realized, and by joint action, conversion from low-temperature oxidation to high-temperature oxidation is accelerated, and ignition is realized.

Description

technical field [0001] The invention belongs to the technical field of oil recovery of low-temperature heavy oil reservoirs, and is aimed at the exploitation of heavy oil and low-temperature heavy oil reservoirs, and in particular relates to a chemical auxiliary ignition agent and an ignition method for low-temperature heavy oil reservoirs. Background technique [0002] Combustion of oil formations is the most efficient method of thermal recovery. Its main application is the extraction of viscous heavy oil. The world's total oil resources are the majority. Under the premise of increasing global energy demand and the decreasing availability of conventional or easy-to-produce crude oil, heavy crude oil, which accounts for about 70% of the world's total oil reserves, will play an important role in the future of the oil industry. play an increasingly important role. The process of burning the oil layer is to inject oxygen into the oil reservoir to oxidize the crude oil. The he...

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Problems solved by technology

[0004] Conventional chemical ignition technology generally uses steam preheating. The high water content of the heated formation increases the difficulty of ignition. At the same time, there are problems such as low reaction efficiency between oxygen and crude oil and gas channeling. Therefore, it is necessary to develop a stable, active, environmentally friendly and reliable ignition agent.