Pumping by wire elongation
US4018547A · kind A · utility
69Cited by
6References
7Claims
0Family size
Inventor
Key dates
| Filing date | Aug 28, 1975 |
| Grant date | Apr 19, 1977 |
| Priority date | — |
| Expiry date | Aug 28, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05C2251/08
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Pumping in oil wells and like application is carried out in a noiseless manner with efficient utilization of energy by raising the plunger or piston in a subsurface pump piston with a long metal rod or cable capable of undergoing memory shape change as a function of a martensitic transformation when worked by application of stress, preferably by gravity through an attached weight, while cold to elongate itself and, upon application of heat thereto, reversing the transformation and contracting in length to raise the piston and associated equipment plus fluid load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.