DEVICE FOR ROUND-TRIP OPERATIONS IN WELLS Russian patent published in 1994 - IPC

FIELD: seismic exploration. SUBSTANCE: device has U-shaped rocker 13 embracing derrick sheave 2 and drive for moving derrick sheave 2 connected with bed frame 1. Drive is made in form of bell-crank 19 whose one arm is rigidly connected to axle 3 of derrick sheave 2, and the other arm carries drive handle 20 with retainer 34. Rocker 13 with its one ends is hinged to bed frame 1 and support of lever 19, and opposite end, in its middle part, with rod 9 of air cylinder 8. The latter is rigidly connected with body 6. Rolling-contact bearing 10 contacting body 6 is installed in zone of joint of rocker 13 with rod 9. Geometric axes of rocker 13 and rod 9 form obtuse angle. Derrick sheave is moved from axle by turning handle 20. Engaged air cylinder 8 turns body 6 with probe from horizontal to vertical positions. EFFECT: reduced labor input for mounting and dismantling the device of wellhead due to its small overall dimensions and mass. 9 dwg