UNIT WITH CONTINUOUS STRING OF FLEXIBLE PIPES FOR REPAIR OF WELLS EQUIPPED WITH SUCKER-ROD PUMPS Russian patent published in 2000 - IPC

FIELD: oil-field equipment. SUBSTANCE: unit may be used in devices for performance of well remedial work with use of flexible pipe strings and serve for flushing, removal of hydrate and paraffin plugs in wells equipped with sucker-rod pumps. The unit has transportation base and its frame carries control cabin, transmission, drum for winding of flexible pipe, ejector ensuring forced feed and withdrawal of flexible pipe from well equipped with sucker-rod pump, with well mouth having eccentric surface plate, mechanism of changing over of ejector and control cabin to operating position. Casing-head stuffing box has curved hollow member and additional sealing unit located in its lower part and hinged with well surface plate. Internal hollow of curved hollow member is connected with lubricator. Curved hollow member has radius of curvature meeting the condition R = > r E/s, where R is radius of curvature of flexible pipe (equals radius of bent pipe curvature); r is outer radius of bent pipe on cross-section; E is modulus of elasticity of flexible pipe material; s is limit of elasticity of flexible pipe. EFFECT: increased productivity of labor in well repair without lifting of tubing string. 2 dwg