Method for reinforcing in-situ combustion exploitation oil reservoir

Abstract

The invention provides a method for reinforcing an in-situ combustion exploitation oil reservoir. The method comprises the steps that an injection-production pattern is deployed; a heating device is tripped in an injection segment of an injection well shaft, and started for heating; manganese dioxide is injected into the injection well shaft, the injection speed of the manganese dioxide is 0.01-50 tons per day, and the injection amount of the manganese dioxide is one ton to 50 tons; potassium chlorate is injected into the injection well shaft, the injection speed of the potassium chlorate is 0.01-50 tons per day, and the injection amount of the potassium chlorate is four tons to 50 tons; air is injected into the injection well shaft, and the injection speed of the air is 10,000-15,000 Nm3 per day; an oil layer is combusted and kept combusted; continuous oil extraction is carried out through a production oil; in the production process, the temperature of the oil layer and the temperature of fluid produced by the production well are monitored, and when it is monitored that the maximum temperature of the combustion area of the oil layer is lowered by more than 50 DEG C, the temperature of the fluid produced by the production well is lowered by more than 30 DEG C, and manganese dioxide, potassium chlorate and oxygen are injected to an injection end again.

Description

technical field [0001] The invention relates to a method for exploiting oil reservoirs, in particular to a method for intensifying fire-burning oil layers to exploit oil reservoirs for the development of underground heavy oil and thin oil reservoirs to increase the recovery rate of crude oil, and belongs to the technical field of oil exploitation. Background technique [0002] The patent application with the publication number 103244092 discloses a method for intensifying the exploitation of heavy oil reservoirs by burning oil reservoirs, and elaborates on the key features of burning oil reservoirs in heavy oil reservoirs and the reasons for the success or failure of field tests: the technology of burning oil reservoirs has high-temperature pyrolysis In the past few decades, a large number of oil companies around the world have carried out a large number of incendiary oil formation in heavy oil reservoir Mine test. However, in the combustion oil layer recovery technology, a...

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Problems solved by technology

[0003] For thin oil reservoirs, due to the different rock mineral composition and oil products in the underground oil layer, the heat conduction temperature rise and oxidation reaction combustion conditions are also different; when the heat released by combustion is not enough to raise the temperature to reach the temperature required for combustion, The burning oil layer will stop, eventually leading to failure

The patent application with the publication number of 1888381 discloses an ignition method for fire flooding oil production in deep low-permeability thin oil reservoirs. This method proposes that at present, the production of thin oil at home and abroad still faces two major problems. Due to the conventional oil recovery method of thin oil wells, most of the water injection development has reached the high water cut period, which reduces the recovery rate. In addition, for the low permeability deep thin oil reservoirs in a large number of geological reserves, due to technical reasons, it has not been possible to produce them.

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