Oil well steel pipe with threaded connection, method for producing oil well steel pipes connected body using oil well steel pipe with threaded connection, and method for producing oil well steel pipe with threaded connection

An oil well steel pipe with a threaded connection, comprising:

• a pipe main body including a first end portion and a second end portion,
• wherein:
• the pipe main body includes:
• a pin formed at the first end portion, and
• a box formed at the second end portion;
• the pin includes:
• a pin contact surface which at least includes an external thread part formed on an outer peripheral surface of the first end portion of the pipe main body;
• an anti-rust grease is applied to the pin contact surface;
• and
• the box includes:
• a box contact surface which at least includes an internal thread part formed on an inner peripheral surface of the second end portion of the pipe main body, and
• a solid lubricant coating formed on or over the box contact surface.

A method for producing oil well steel pipes connected body in which a plurality of oil well steel pipes with a threaded connection are fastened together, comprising:

• an oil well steel pipe preparation process of preparing an oil well steel pipe with a threaded connection;
• wherein:
• the oil well steel pipe with a threaded connection comprises:
• a pipe main body including a first end portion and a second end portion;
• the pipe main body includes:
• a pin formed at the first end portion, and
• a box formed at the second end portion;
• the pin includes:
• a pin contact surface which at least has an external thread part formed on an outer peripheral surface of the first end portion of the pipe main body;
• an anti-rust grease is applied to the pin contact surface;
• and
• the box includes:
• a box contact surface which at least includes an internal thread part formed on an inner peripheral surface of the second end portion of the pipe main body, and
• a solid lubricant coating formed on or over the box contact surface;
• the method for producing oil well steel pipes connected body further comprising:
• a process of transporting the oil well steel pipe with a threaded connection to a local yard that is a place for temporarily storing the oil well steel pipe with a threaded connection,
• a process of temporarily storing the oil well steel pipe with a threaded connection transported to the local yard, at the local yard,
• a process of, before delivering the oil well steel pipe with a threaded connection that is temporarily stored at the local yard to an oil well drilling site at which the oil well steel pipes connected body is to be formed, removing the anti-rust grease applied to the pin contact surface of the oil well steel pipe with a threaded connection, and applying a light oil to the pin contact surface from which the anti-rust grease is removed,
• a process of delivering the oil well steel pipe with a threaded connection having the light oil applied to the pin contact surface to the oil well drilling site, and
• a process of, at the oil well drilling site, fastening the oil well steel pipe with a threaded connection having the light oil applied to the pin contact surface to another oil well steel pipe with a threaded connection to form oil well steel pipes connected body.

A method for producing an oil well steel pipe with a threaded connection, comprising:

• a process of temporarily storing, at a local yard, an oil well steel pipe with a threaded connection delivered to the local yard,
• wherein:
• the oil well steel pipe with a threaded connection comprises:
• a pipe main body including a first end portion and a second end portion;
• the pipe main body includes:
• a pin formed at the first end portion, and
• a box formed at the second end portion;
• the pin includes:
• a pin contact surface which at least has an external thread part formed on an outer peripheral surface of the first end portion of the pipe main body;
• an anti-rust grease is applied to the pin contact surface;
• and
• the box includes:
• a box contact surface which at least has an internal thread part formed on an inner peripheral surface of the second end portion of the pipe main body, and
• a solid lubricant coating formed on the box contact surface;
• the method for producing an oil well steel pipe with a threaded connection further comprising:
• a process of, before delivering the oil well steel pipe with a threaded connection that is temporarily stored at the local yard to an oil well drilling site at which oil well steel pipes connected body is to be formed, removing the anti-rust grease applied to the pin contact surface of the oil well steel pipe with a threaded connection, and applying a light oil to the pin contact surface from which the anti-rust grease is removed.