Methods for pulling sucker rod strings
US4422508A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1981 |
| Grant date | Dec 27, 1983 |
| Priority date | — |
| Expiry date | Aug 27, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method and means for pulling a sucker rod string from a well is disclosed. A separable connector is provided in the sucker rod string above the pump body. The connector comprises a male and a female section having aligned openings and joined by a shear pin within said openings. The force required to shear the pin and separate the sections of the connector is substantially greater than that required for normal operation of a downhole reciprocating pump or similar tool but is substantially less than the weight of the fluid column above the downhole reciprocating pump. The disclosed methods include insertion of this connector into a sucker rod string, such as one including fiberglass sucker rods, above the pump. The pump is then operated in the normal known fashion. To remove the sucker rod string, tension in the string is increased above that required to operate the pump until the pin within the connection shears, separating the sucker rod string from the pump. The sucker rod string may then be removed from the well and a parrafin scraper inserted therein to remove accumulated scale and parrafin from the inner wall of the tubing before the pump is fished out of the well. This inven…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.