Method of molding a composite drill collar
US5009826A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 1, 1989 |
| Grant date | Apr 23, 1991 |
| Priority date | — |
| Expiry date | May 1, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/16
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method of molding thermoplastic material into a collar for use on a drill string is disclosed. Initially a precursor is constructed by rolling a sheet of thermoplastic material, containing long reinforcement fibers, into a tubular "roll" and placing the roll in a generally cylindrical open mold so as to align longitudinal axes of the roll and the open mold. A cylindrical mold core, which mates with the open mold to form a mold cavity, has an end piece perpendicular to the cylindrical portion for closing the mold. The mold core is forced, with correct alignment, into the open mold using high pressure which closes the mold and causes the thermoplastic material, containing long reinforcement fibers, to take the required shape. The thus formed part is cooled and ejected from the mold for use as the precursor. Final steps include machining the ends of the precursor to produce the desired collar.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.