Patent ID: 9631450
Date: 2017-04-25
CPC Classifications: E21B

Claim:
1. A surface layer conductor running tool for deep-water well drilling, comprising: a mandrel, an inner sleeve, an outer sleeve, and a main body, wherein the inner sleeve, the outer sleeve, and the main body are fitted over the mandrel sequentially; the inner sleeve is configured to slide up and down but is configured to not rotate in relation to the mandrel, the outer sleeve and the inner sleeve are connected via a transmission thread pair, and the main body is situated on the inner sleeve; at least one retaining pawl penetrating the main body and radially slidable in horizontal direction; and an anti-rotation pin penetrating the main body and the outer sleeve, so that the outer sleeve is configured to move up and down in the main body only, but is configured to not rotate; the main body and the inner sleeve form a cavity in which the outer sleeve is located; the main body has eight flow-back holes distributed symmetrical along the circumference, a bottom surface of the main body has four rib plates arranged radially and distributed evenly along the circumference, the at least one retaining pawl includes eight retaining pawls, the eight retaining pawls are arranged radially on a middle part of the main body and are evenly distributed along the circumference, the retaining pawls are configured to slide radially in the main body, an inner end of each of the retaining pawls is in a semi-spherical shape configured to engage the outer sleeve, and an outer end of each of the retaining pawls has three horizontal protruding claws configured to engage the conductor; an outer diameter of the main body is varying, larger at an upper part and smaller at a lower part.