METHOD OF TAPPING OF PRODUCING FORMATION OF FLUID MINERAL Russian patent published in 2002 - IPC

FIELD: oil producing industry; applicable in mining of producing formations containing oil and/or gas. SUBSTANCE: method includes installation and cementing of casing string in drilled well; perforation of casing string; formation of process cavity in producing formation round well. This is done by cutting and carrying out of rocks of producing formation by high-pressure jet of fluid with abrasive supplied through jet-forming nozzles of well hydraulic giant. In so doing, abrasive is separated from pulp for its reuse in well. One part of cut rocks of producing formation is lifted to surface in pulp flow. Walls and roof of formed process cavity are maintained in stable state due to its filling with mixture of cut rocks of producing formation and abrasive. According to invention, prior to lowering of well hydraulic giant, its body and well bottom hole are filled with abrasive. Abrasive is supplied to jet forming nozzles in pulp flow ejected by high- pressure jet of fluid. Process cavity is formed by separate parts with pillars leaved between them successively from top down from roof of producing formation to its bottom. Abrasive is separated from pulp for its reuse above opened top body of well hydraulic giant in zone of reduction of pulp flow velocity. EFFECT: increased productivity of labor in tapping of producing formation of fluid mineral. 2 cl, 3 dwg