Grant Tfw

Thomas B Smith

Frank J Carlin

A method is provided for maintaining threaded joints of a tool string to prevent jamming of the threads by rotation of a tool string required during movement of the tool string through a generally horizontal production portion and a curved bore portion of the well. Each thread joint is formed by use of an externally threaded pin and box configuration with the external diameter of the box substantially exceeding the external diameter of the pin. The cooperating threads are configured so that limited relative axial movement produces locking of cooperating threads against realtive rotation after full engagement. Relative axial movement is produced during makeup of the tool string by rotating a sleeve threadably mounted on the exterior of the pin and engagable to produce axial movement. The sleeve has an external diameter less than the box to prevent frictional engagement of the sleeve with the bore wall of the curved bore portion of the well.

Growing community of inventors

Houston, TX, United States of America

Thomas B Smith