| 摘要 |
FIELD: oil-and-gas production. ^ SUBSTANCE: proposed mobile drilling jig comprises derrick consisting of support and top bases, vertical guides and bars, carriage mounted in slides to move in vertical guides and carry drilling mechanism made up of drill rods and drill, swivel with branch pipe to feed recirculated water, and carriage lifting mechanism. Collapsible derrick support and top bases represent regular triangle, while drilling axis is taken to pass through support base center of gravity and top base side center. Drilling mechanism is coupled via reduction gear with reversing motor connected to power supply via electronic control unit with frequency converter. In dry drilling, screw auger replaces said drilling mechanism. ^ EFFECT: drilling in hard-to-access places. ^ 6 cl, 8 dwg |
