The oil drilling is with preventer in the whole case on-off drilling tool

• Main Authors: WU TIANQIAN, WANG AIKUAN, TIAN XIANGLU, ZHU HUAIJUN
• Format: Patent
• Language: English
• Published: 29.07.2015
• 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 discloses the oil drilling is with preventer in the whole case on-off drilling tool belongs to well drilling downhole tool, comprises shell body and case, and it is tubular that the casing is a cylinder, and hole from the top down has the two step, and first step internal diameter is bigger than the whole external diameter of case, and the internal diameter of a second step is the same with the case external diameter. The casing is packed into to the case with the global state in, the case topmost is the retaining ring, and the retaining ring links together through screw and shunt, and shunt hole bottom is installed to glue and is blocked up, and the shunt passes through fixed pin be connected together with the valve body, the piston lower part cover of the inside bottom of valve body is equipped with return spring, and the piston is inside to have a water injection well choke, is connected with at the bottommost of case and glues the ring, and the valve body of the preventer is inside as the whole direct placed casing of one, and simple structure is compact, the good reliability, and the form is novel, is convenient for install and use, is fit for popularization by a large scale, and the change of valve body has reduced man-hour, has improved work efficiency.