MARK APPLYING METHOD TO VISUALIZE OIL- AND GAS-FIELD PIPE SPINNING-UP (VARIANTS), PIPE SPINNING-UP METHOD AND VISUAL CONTROL METHOD Russian patent published in 2007 - IPC E21B17/00 E21B19/16 

FIELD: oil and gas well construction, particularly for casing pipes, flow strings and other technological pipes.

SUBSTANCE: pipe spinning-up method involves seating nipple end on one pipe in clutch end of another pipe, which is fixed from rotation; screwing-in nipple end of the first pipe into another one with increasing twisting moment; aligning mark formed on the first pipe with mark created on clutch end of another, fixed, pipe by rotation of nipple end of the first pipe as pipe ends touch each other; screwing-up nipple pipe end. Nipple pipe end at first is screwed-in by hand. Then above pipes are spun-up up to bringing clutch pipe end to level of transversal mark location on nipple pipe end or below above level. Screwing-up of nipple pipe end is carried out due to resilient deformation of thread members to obtain predetermined interference in threaded connection, seal belts and to achieve good air-tightness of pipe ends abutting each other by smooth shock free twisting moment increase at clutch end temperature of not more than 80°C up to bringing into register of nipple pipe end mark with additional mark formed at clutch end of fixed pipe and spaced apart from the first mark created on above pipe in pipe spinning-up direction, wherein the clutch pipe end is located at level of transversal mark formed at nipple pipe end or is below above end and spaced not more than 0.5 mm from above level.

EFFECT: possibility to demonstrate passed spinning-up stages and pipe assemblage termination due to provision of spaced marks bearing different information.

4 cl, 6 dwg