Metal pipe for oil well

• Main Authors: KURANISHI TAKAO, BENIYA YUKI, NAKAMURA KEIICHI
• Format: Patent
• Language: Chinese; English
• Published: 14.04.2023
• 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

Provided is a metal pipe for oil wells, which can achieve both high yield torque and excellent wear resistance. This oil well metal pipe is provided with a pipe body. The pipe main body includes a male buckle portion (40) formed at a first end portion (10A) and a female buckle portion formed at a second end portion. A plating layer is formed on one of a pin contact surface (400) of the pin (40) and a box contact surface of the box (40), i.e., a first contact surface, and a solid lubricating layer is formed on the plating layer. The arithmetic mean deviation (Ra) of a second contact surface, which is the other of the pin part contact surface (400) and the box part contact surface, is 0.5-10.0 [mu] m, and a semi-solid or liquid antirust coating (80) is formed on the second contact surface. 提供一种可兼顾高屈服扭矩和优异的耐磨损性的油井用金属管。本公开的油井用金属管具备管主体。管主体包括形成于第一端部(10A)的公扣部(40)和形成于第二端部的母扣部。在公扣部(40)的公扣部接触表面(400)和母扣部的母扣部接触表面中的一者即第一接触表面形成有镀层，镀层上形成有固体润滑层。公扣部接触表面(400)和母扣部接触表面中的另一者、即第二接触表面的算术平均偏差Ra为0.5～10.0μm，第二接触表面上形成有半固态或液态的防锈覆膜(80)。