METHOD OF SECONDARY OPENING UP OF PRODUCING FORMATION Russian patent published in 1999 - IPC

FIELD: development of deposits of formation fluids (oil, gas, water, etc); applicable in operation of multihorizon deposits. SUBSTANCE: method includes lowering and grouting in course of well drilling of intermediate casing strings and flow string with their provision with strainers having chemically destructible plugs against each producing formation. Strainers have centralizers. In course of grouting, tubing-casing annular spaces within strainers interval are filled with nonsolidifying solutions. Secondary opening up of producing formations is accomplished by successive destruction of strainer plugs and removal of special nonsolidifying solution from tubing-casing annular spaces. EFFECT: extended field of application of method due to its possible use in development of multihorizontal deposits whose producing formations are cased with intermediate casing strings. 1 dwg