DERRICK UNIT Russian patent published in 1994 - IPC

FIELD: oil field equipment. SUBSTANCE: derrick unit has driller's module made of bulk truss with open front panel whose upper part has blocks of hoisting rope of derrick raising device. Frame of rig floor is connected with underderrick frames and substructure by means of two pairs of turning posts for plane-parallel motion. Side vertical walls are installed on underderrick frames. In this case, front pair of turning posts is installed between walls, and derrick tiers, in front part of drilling rig and provided with locking device for securing floor frame in raised position. Driller's module has shelter walls hinged to upper panel of space truss. Shelter installed in front part of floor is made in form of horizontal sections interconnected by pin joint. Lower section is rigidly installed on folding floor platforms having holes to receive pins of each section. EFFECT: higher efficiency. 5 cl, 8 dwg