Well pump tubing scrapers

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 17/10 (2006.01) E21B 37/02 (2006.01)

Patent

CA 2129620

A well pump sucker rod scraper arrangement that includes a sucker rod, scrapers fixed to said rod and a scraper at spaced apart positions movably mounted on said rod, between adjacent pairs of the fixed scrapers. The movable and fixed scrapers each have surfaces at respective opposite ends thereof and an outer fluted surface. The fluted surface is defined by spaced apart ribs and the ribs on the movable scraper are angularly disposed relative to the longitudinal axis of the rod. The movable scraper has a slot lengthwise thereof with a throat portion whose width is narrower than the diameter of the rod and through which the rod passes when pressing such movable scraper onto the rod. A lug on the fixed scrapers project therefrom in a direction toward an adjacent movable scraper and the lugs are so positioned so as to project into said slot of a movable scraper associated therewith as the latter approaches the fixed scraper and prior to engagement of the abutting planar end surfaces on the respective scrapers.

La présente invention a pour objet un ensemble tige de pompage et racleur constitué d'une tige de pompage à laquelle sont fixés des racleurs; un racleur mobile se déplace le long de la tige de pompage entre les paires de racleurs fixes. Les racleurs mobiles et les racleurs fixes présentent des surfaces de travail à leurs extrémités opposées et des cannelures à leur périphérie extérieure. La surface cannelée est définie par des nervures espacées et les nervures des racleurs mobiles forment un angle par rapport à l'axe longitudinal de la tige. Le racleur mobile comporte une fente dans le sens de sa longueur, et une gorge de largeur inférieure au diamètre de la tige; le racleur est emmanché sous pression en passant la tige de pompage à travers cette gorge. Un tenon saille de l'extrémité des racleurs fixes en direction de l'extrémité d'un racleur mobile, le tenon en question étant positionné de manière à pénétrer dans la fente du racleur mobile qui lui est associé lorsque celui-ci s'approche du racleur fixe et avant que les surfaces d'extrémité adjacentes des racleurs respectifs ne viennent en contact.

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