Guider with variable diameter of drilling tool

• Main Authors: CHEN MING, GAO SUIQIN, NIU TINGZHI, WANG ZHANJUN, SHI YONGSHENG, CUI LANGLANG, ZHOU YAN, MENG YONGHONG
• Format: Patent
• Language: Chinese; English
• Published: 31.12.2019
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention discloses a guider with the variable diameter of a drilling tool. The guider includes a cylindrical central body, a convex ring with the same axis is arranged on the upper part of the outer wall of the central body in an axial extension mode, and an upper roller path and a lower roller path which are of annular structures and located on the upper part and the lower part of the convexring correspondingly are formed in the outer side of the central body in a surrounded mode; a plurality of roller assemblies are evenly distributed between the upper roller path and the lower rollerpath in the circumferential direction of the central body at intervals, and the roller assemblies are matched with the upper roller path and the lower roller path correspondingly in rolling modes; a swing arm assembly is arranged on each connection bracket; and the central body is provided with a rolling bearing located below the lower roller path and at least two telescopic mechanisms, the fixedend of each telescopic mech