DEVICE FOR DETERMINATION OF PIPE STRING LENGTH AND SPEED DURING LOWERING AND LIFTING OPERATIONS AT WELL Russian patent published in 2019 - IPC E21B47/09 G01B7/04 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to means of monitoring process of operation and repair of well and can be used for measurement of length and speed of pipe string both at their descent, and lifting. Device for determination of length and speed of pipe string during lowering and lifting operations on well includes device for lowering of pipe string into well and device for fixation of movement of pipe string in time and space, wherein device for fixing movement of pipe string in time and space is made in form of a non-contact measuring device, rigidly fixed on roller clamp of device for lowering pipe string into well, made in form of two flanges with through hole for movement of pipes, between which roller clamp is installed, consisting of two rollers with concave outer surface, installed on spring-loaded axles symmetrically relative to through hole with possibility of rotation and movement in plane perpendicular to movement of pipes for interaction with their external surface.

EFFECT: invention enables to create a device which accelerates the process of measuring the length and speed of moving a pipe string during lowering and lifting operations and provides high accuracy of measuring the length of a lowered or raised pipe string.

1 cl, 4 ex