Screw drill centralizer

• Main Authors: JIA YUNCHAO, LI HONGGUO, YAN ANYUAN, WANG ZIMIN, LIU CHUNLIN, SUN CHENGLONG
• Format: Patent
• Language: English
• Published: 06.05.2015
• 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 utility model relates to a screw drill centralizer. The screw drill centralizer is composed of a body, trapezoid centralizing blocks and hard alloy particles, wherein the body is a screw drill shell, the three columns of trapezoid centralizing blocks are distributed on the surface of the screw drill shell in the longitudinal direction at equal intervals and arranged in a linear mode, the centralizing blocks in adjacent columns in the circumferential direction are arranged in a stagger mode, the top portions and bottom portions of the centralizing blocks at two ends all have big gradients, the hard alloy particles are embedded in the surfaces of the trapezoid centralizing blocks, and exposed tooth height is within the 2.5 mm negative tolerance range. The screw drill centralizer is simple in structure and convenient to use, the contact area between the centralizer and the wall of a well can be effectively reduced, the influence of backing pressure during slipping drilling on the horizontal section is eliminated, orientation speed and success rate are increased, time is shortened, and drilling cost is reduced.