Composite dual channel drill pipes and method of manufacture
AssigneeSaudi Arabian Oil Company
InventorGraham Hitchcock
Life of this patent
Estimating the term…
Abstract
A composite drill pipe including an inner pipe having a first diameter, an outer pipe having a second diameter greater than the first diameter, and a plurality of flow channels formed between the inner pipe and the outer pipe. The plurality of flow channels are formed by a plurality of walls extending radially between an outer diameter of the inner pipe and an inner diameter of the outer pipe. A method of forming a composite drill pipe includes pultruding a drill pipe comprising an inner pipe having a first diameter, an outer pipe having a second diameter greater than the first diameter, and a plurality of flow channels formed between the inner pipe and the outer pipe. The method also includes providing a multi-directional reinforcement over an outer diameter of the outer pipe.
Claims14
A system comprising:
- a composite drill pipe comprising:
- an inner pipe having a first diameter, the inner pipe forming an inner flow channel;
- an outer pipe having a second diameter greater than the first diameter, wherein the inner pipe and the outer pipe have a common axis;
- and
- a plurality of outer flow channels formed between the inner pipe and the outer pipe;
- an end coupling, the end coupling comprising a plurality of protruding elements corresponding to the plurality of outer flow channels,
- wherein the end coupling is inserted into an end of the composite drill pipe such that the plurality of protruding elements of the end coupling are respectively inserted in the plurality of outer flow channels, thereby forming a coupling interface between the composite drill pipe and the end coupling.
Dependencies are inferred from the claim text.