E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/4, 116/66.1
E21B 12/00 (2006.01) E21B 47/10 (2006.01) G01M 3/28 (2006.01)
Patent
CA 1204634
ABSTRACT An apparatus for detecting ruptures in a drill pipe above and below the drill collar comprising a nose cone, a lower body threadably engaged to the nose cone. The lower body has a structure defined by a plurality of circulation by-pass apertures and shear pin apertures. A cylinder actuator having actuator apertures is installed within the lower body juxtaposed to the shear pin aper- tures. Shear pins slideably lodge through the shear pin apertures of the lower body into the actuator apertures of the cylinder actua- tor. A steel ball seats on top of the cylinder actuator. An upper body threadably engages the lower body and a retrieval cap thread- ably engages the upper body. The apparatus seats into a seating sub in operation of the invention. The method of detecting and cor- recting ruptures in a drill pipe above and below the drill collar to prevent loss of drilling mud comprises running a seating sub in the drill string at the top of the drill collar and subsequently dropping a washout locator tool into the drill pipe until the tool seats in the seating sub. The drill string is pressurized above the seated tool to a predetermined pressure. The predetermined pressure is monitored to ascertain whether or not the predetermined pressure holds without bleeding off, indicating that there is no noticeable leak in the drill string between the tool and the sur- face, or doesn't hold and bleeds off indicating that there is a leak. If the pressure holds without bleeding off, shearing pins are sheared in the tool to establish circulation and the drill string is pulled dry and the bottom hole assembly below the drill collar is checked. When the pressure does not hold, the drill string is pulled in order to detect and correct any ruptures which cause the decrease in the predetermined pressure. -1-
437489
Polley Jack L.
Smart & Biggar
LandOfFree
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