DEVELOPMENT METHOD OF OIL AND GAS DEPOSITS USING HIGH-POWER LASER RADIATION FOR THEIR MAXIMUM EXTRACTION Russian patent published in 2014 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: according to the method, productive formations are mined by laser radiation, and areas with the specified temperature and formation pressure are created in formations to increase the oil and gas removal degree. The formation treatment process is repeated for many times at required time intervals with simultaneous radiation in several sectors mutually displaced to a certain angle relative to each other with divergence of beams in each sector to the specified angle. At the same time, remote control of temperature, pressure, dimensions and shapes of cavities formed in formations and rocks, and their closure is performed through optic fibres; information on composition of evaporated substances of formations and rocks is obtained. According to the invention, actuating devices of laser assemblies are arranged at the specified depth in wells; multiple long bore pits of a small diameter are drilled out of adjacent production wells opposite to each other using light energy emitters in ends of drilling crowns till their mutual intersection in the space of formations. Chippings drilled out of mine faces of the long bore pits are fully evaporated under action of laser radiation. At new deposits, any wells from surface are drilled onto formations of deposits using laser mechanical drilling. Light energy emitters and fibre-optic cables, which transmit light energy via optic fibres from high-power lasers on surfaces, are arranged in internal openings of mechanical drilling tools with hollow drive rods and crowns. At the same time, layers of mixtures of the chippings drilled out of mine faces and remained after evaporation by laser radiation are surfaced on well walls by light radiation from auxiliary side or other emitters for the purpose of attachment. Several layers are surfaced on walls at failed or carbonate rocks. Walls are ground after complete construction of wells. Well walls, tubing and other field equipment is cleaned from asphaltene-resin-paraffin deposits by their melting and evaporation by laser radiation. Diameters of production wells are increased using laser mechanical drilling tools with telescope-type reamers. During operation diameters of production wells are increased for many times by cutting layers off the wells with accumulated deposits, paraffins, resins, asphaltenes, and filtration to wells of oils and gases from formations is improved. After maximum diameters of production wells are achieved, long bore pits of small diameters are drilled out of them by means of actuating devices of laser assemblies to achieve the specified level of oil and gas recovery.

EFFECT: increasing efficiency of the method.

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