Fracturing proppant filling assisted catalytic ignition combustion oil layer huff and puff oil recovery method

Abstract

The invention provides an oil in-situ combustion huff and puff oil production method for assisting catalytic ignition by filling a fracturing propping agent. The method comprises the steps that hydraulic fracturing is conducted on a well-case perforating well so as to form an artificial fracture in the stratum, and the mixture of the fracturing propping agent and a catalyst is added so that the fracture and an annulus of a screen tube and a sleeve tube can be filled with the mixture; the fracturing propping agent includes gravel, ceramsite and / or quartz sand; pump tripping cold production is carried out until a wellhole produces oil; 150-400 t of steam is injected into the stratum, so that the stratum is pre-heated; air is continuously injected into the stratum so that the oil layer can be ignited; after the air is injected, the well is shut in for soaking; the well is opened for back production. By the adoption of the method, the ignition success rate can be improved, and the oil in-situ combustion huff and puff development effect can be improved.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, and in particular relates to a huff and puff oil recovery method of burning oil layers by adopting fracturing and proppant filling technology to assist catalytic ignition. Background technique [0002] At present, China's heavy oil development methods mainly include steam stimulation (about 78%), steam flooding (about 10%) and conventional water flooding (about 10%). These methods are simple in process and high in recovery, and are suitable for heavy oil reservoirs with shallow burial depth (less than 1000m). However, for oil reservoirs buried deep (greater than 1500m), water-sensitive oil reservoirs, thin interbedded oil reservoirs, etc., due to the problems of high heat loss rate and high steam injection pressure during steam injection, the production of this type of heavy oil will bring serious problems. difficult. For the above-mentioned oil reservoirs that are difficult to be effectiv...

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Problems solved by technology

This ignition method is improved compared with the above two ignition methods, but because the combustion accelerant used is solid particles, its particle size is often larger than the size of the pore throat in the porous medium of the formation, resulting in most of which cannot enter the formation with the crude oil Deep, but stagnated near the wellbore, so it cannot play a catalytic or combustion-supporting role for a long time

During the practice of the mine, many wells even caused the formation near the well to be blocked. Not only did the ignition fail, but additional operations had to be carried out

[0008] In summary, although the current chemical catalytic ignition technology has outstanding advantages and is suitable for the process of burning oil reservoirs, the existing chemical ignition catalysts (such as platinum / carbon catalysts, palladium / carbon catalysts, etc.) are mostly solid particles, which are difficult to effectively sustain in practical applications. play a role, chemical catalytic ignition technology has not been popularized and applied

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