ELEVATOR FOR TWO PIPE STRINGS TRIP Russian patent published in 2014 - IPC E21B19/06 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed elevator comprises case, flap and flaps locking mechanism. Round recess for pipe is arranged at the case front surface. Flap is articulated with said case. Extra round recess is made at front surface for second pipe and equipped with extra flap. Said flap is articulated also with said case and extra flaps locking mechanism. Counterweight is arranged at case rear side. Said flaps locking mechanism comprises rotary lever with handle. Control lever interacts with spring-loaded flap rotary retainer interacting with round groove in closed position. Groove centre at flap closed position is aligned with flap retainer turn axis centre. Spring-loaded flap rotary latches are articulated with the case to interact with retainer in flap closed position. Note here that said round recesses for pipes, flaps and their locking mechanisms are symmetric about the case crosswise axis. Spacing between round recesses centres is larger than diameter of pipes couplings. Rotary control levers with handles interact with retainers and are articulated with flaps. Round grooves are made in round recess walls. Linear sizes in horizontal plane perpendicular to lengthwise axis passing through round recess centres in closed position of flaps satisfy the relationships: L₁<L₂+R; L₂+R<L₃+r; h≥r/3, where L₁ is the length of flap 10 from its centre to axis of turn to the end, interacting with the wall of round recess 4; L₂ is distance from said flap centre to round recess radius in case 1; R is radius of recess 4; L₃ is distance between centres of axis of flap 10 and that of retainer 14; r is radius of retainer bearing surface arc equal to that of mating surface of round groove 16 make in case 1; h is depth of round groove 16. Note here that angle β between line between aforesaid centres and that between retainer axis centre and retainer thrust surface arc centre interacting with mating surface of the case round groove at closed position of the flap makes 45°.

EFFECT: higher reliability and safety, expanded performances.

1 cl, 7 dwg