Drillpipe sub
AssigneeReeves Wireline Technologies Limited
InventorsKeith Anthony Fritchley, Michael Charles Spencer
Life of this patent
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Abstract
A drillpipe sub (30) comprises a shaft (32), a first frustoconical member (34) encircling, and fixedly mounted on, the shaft (32), and a second, opposed frustoconical member (36) encircling, and slidably mounted on, the shaft (32). The first frustoconical member (34) is bonded at its base (38) to the base (40) of the second frustoconical member (36).
Claims14
A drillpipe sub comprising an elongate body member defining at least one outer periphery;
- a first, flexible, frustoconical member including a securing portion and a base portion that is radially spaced from the securing portion, the securing portion being fixedly secured relative to the said periphery;
- and a second, flexible, frustoconical member defining a further base portion, the base portions of the respective frustoconical members being secured together so that the second frustoconical member interconnects the base portion of the first frustoconical member and the body member or a further member adjacent thereto;
- and the second frustoconical member being moveable relative to the body member at least parallel to the length thereof.
A drillpipe sub comprising a first, flexible, frustoconical member including a securing portion and a base portion that is radially spaced from the securing portion, the securing portion being fixedly securable to an elongate body member;
- and a second, flexible, frustoconical member defining an engaging portion and a further base portion, the said engaging portion being moveably engageable with an elongate body member and the base portions of the respective frustoconical members being secured together.
A drillpipe sub according to any preceding claim wherein the first frustoconical member defines a hollow interior.
A drillpipe sub according to any preceding claim wherein the second frustoconical member defines a hollow interior.
A drillpipe sub according to any preceding claim wherein at least one of the said first and second frustoconical members is formed of or includes a resiliently deformable material.
A drillpipe sub according to any preceding claim wherein at least the first frustoconical member includes one or more resiliently deformable folding portions that assist dilation and contraction of the frustoconical members.
11 A drillpipe sub according to claim 10 wherein the second frustoconical member includes one or more said resiliently deformable, folding portions.
A drillpipe sub generally as herein described with reference to and/or as illustrated in the accompanying drawings.
Dependencies are inferred from the claim text.