DEVICE FOR DELIVERY OF INSTRUMENTS TO HIGH-PRESSURE OIL OR GAS WELLS Russian patent published in 2002 - IPC

FIELD: oil and gas producing industry. SUBSTANCE: device may be used in lowering of various instruments into wells to which fluid is supplied under high pressure. The device has weights installed on instruments. Weights have internal cavity. Lower part of weights has plugs with shear wire locks of the same or different diameters operating at attaining of calculated pressure in well fluid. Holes for plugs are made according to conditions of separate for one weight or total for all weights equality or excess of product of cross-section of hole or sum of holes by value of well pressure above difference between pushing-out force and weight of assembly. In this case, each weight upper part has plugs for air release from cavity. Plugs are moved by pressure of fluid entering weight cavity and through holes are opened by plug in its motion. EFFECT: weighting of weights at moment of instrument leaving the lubricator to come into well, and provision of instrument entering into well. 1 dwg