Production pump for high gravity or sand laden oil
US4921407A · kind A · utility
8Cited by
2References
10Claims
0Family size
Inventor
Key dates
| Filing date | May 22, 1989 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | May 22, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B47/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A plunger type pump for use with heavy oil or oil mixed with sand is set forth. It incorporates bottom and top cylinders which are joined at a central bushing. A standing check valve in a polished tube enlargement at the top end cooperates with a bottom check valve in the bottom cylinder. A safety joint on the sucker rod string is included for easy connection. Another feature is a top end sleeve connected with a pin and J-slot arrangement held to a surrounding sleeve. Two sleeves are separated by breaking shear pins axial movement, rotation in a particular direction and additional axial movement to accomplish J-slot disengagement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.