Flexible sinker bar assemblies
US6227292A · kind A · utility
Inventor
Key dates
| Filing date | Oct 21, 1999 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Oct 21, 2019 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B31/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Apparatus for recovering logging tools and the like from a wellbore as part of a drilling operation such as for oil wells, irrigation systems and the like. The apparatus includes the use of a flexible connector member in the form of a flexible wire rope, or strand, or cable, or a series of short, bar-like members having lengths of about a couple of inches, or longer, which may be connected together by, for example, hinge pins, or U-joint connectors, or heavy chain-like links, or short lengths of wire-rope. The flexible connector members are provided with socket members attached with resin or by being swaged or crimped to the flexible member. The apparatus takes the place of the conventional rigid sinker bar assembly that typically may be approximately 20 feet in length and causes safety concerns when used with a top drive housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.