公开(公告)号：EP1078190A4

公开(公告)日：2003-04-09

申请号：EP99920274

申请日：1999-04-30

申请人： GRANT PRIDECO INC

发明人： WILSON GERALD E ,  MOORE R THOMAS ,  TANG WEI

IPC分类号： F16L25/00 ,  E21B17/16 ,  E21B17/22 ,  C21D9/00 ,  C22C38/00

CPC分类号： E21B17/16 ,  E21B17/22 ,  Y10T29/49904 ,  Y10T403/68

摘要： A heavy weight drill pipe member is disclosed for use in drilling high angle and horizontal well bores in a corrosive environment. The heavy weight drill pipe member consists of a tubular member (10) with a longitudinal bore (29) therethrough, and includes connectors or tool joints (20, 22) attached at each distal end for connecting additional heavy weight drill pipe members. The tubular member (10) and tool joints (20, 22) are preheated, water quenched and tempered to obtain a unique combination of hardness, a yield strength and impact strength for improved resistance to stress corrosion cracking and hydrogen embrittlement in a hydrogen sulfide environment. The tubular member (10) includes a plurality of wear pads or protectors (12, 14, 16) equidistantly spaced along the longitudinal axis of the tubular member (10) to reduce bending stress in the pipe by limiting the degree of bend when the pipe is placed in compression in a high angle well bore. To reduce the chances of differential pressure sticking of the pipe when the pipe is used in high angle or horizontal well bores, each wear pad or protector (12, 14, 16) is provided with spiral grooves (24) therein. Each wear pad or protector (12, 14, 16) may also be hard faced or hard banded to reduce wear.