China National Petroleum Corporation

Cnpc Tubular Goods Research Institute

Chun Feng

Peng Wang

Jiandong Wang

Yonggang Liu

Fangpo Li

Xiaojun Li

Qi Shi

Xinhu Wang

Lihong Han

A connection structure between an aluminum alloy drill pipe body and a steel joint of an aluminum alloy drill pipe includes a first joint at an end of the aluminum alloy pipe body and a steel second joint; wherein the first joint includes a first external threaded section and a second external threaded section provided from outside to inside thereof, and a major diameter of the first external threaded section is smaller than that of the second external threaded section; and wherein the second joint includes a first internal threaded section which is able to be fitted with the first external threaded section and a second internal threaded section which is able to be fitted with the second external threaded section, and a pitch diameter of the second external threaded section is larger than that of the second internal threaded section.

Connection structure between pipe body and steel joint of aluminum alloy drill pipe

A connection structure between a pipe body and a joint of an aluminum alloy drill pipe comprises a first joint portion located at an end of the aluminum alloy pipe body and a second joint portion, wherein the first joint portion comprises an external cone section, an external threaded section and a first seal end face sequentially provided from inside to outside thereof, and a taper of the external cone section is smaller than that of the external threaded section; wherein the second joint portion is cylindrical and comprises an internal cone section fitted with the external cone section, an internal threaded section fitted with the external threaded section, a second seal end face, an elevator shoulder face, and a concave arc transition section between the internal cone section and the internal threaded section.

Connection structure between pipe body and joint of aluminum alloy drill pipe

Growing community of inventors

Beijing, China

Chun Feng