Automatic paraffin removal unit
US6749019B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jan 7, 2002 |
| Grant date | Jun 15, 2004 |
| Priority date | — |
| Expiry date | Jan 7, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B37/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An automatic paraffin removal unit, including a scraper body, a tumbler, an arc spring leaf and a return torque spring, and the upper and lower commutators having a sleeve, an open spacing ring and a tower spring. In operation, the scraper is clamped on a pumping rod, while the upper, lower commutators are respectively connected to the upper, lower ends of the tubing section from the well head to the section having toe temperature lower than paraffin deposition temperature requiring paraffin removal. The scraper moves up and down following the pumping rod via unidirectional upward or downward movement, paraffin removal being performed to the inner wall of tubing and pumping rod unceasingly, and variations in direction being performed in the upper, lower commutators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.