Apparatus for testing earth formations
US4108243A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | May 27, 1977 |
| Grant date | Aug 22, 1978 |
| Priority date | — |
| Expiry date | May 27, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Improved apparatus and methods are provided for conducting drill stem and production testing operations. A bypass sub removably receives a wireline tool in sealing engagement within a bypass sub bore, with the bypass sub including bypass passage means and selectively actuable port closure means to permit fluid from below the bypass sub to flow into conduit means above the bypass sub when the wireline tool is seated and secured in the bypass sub. In one embodiment, the means for selectively actuating the port closure means is a motorized shifter means incorporated in the wireline tool. The wireline tool carries selected sensor devices for sensing earth formation characteristics. Improved and unique means are provided for securing the wireline tool in the bypass sub and for selectively engaging the motorized shifter apparatus wih the port closure means. In addition, unique "fail safe" means are provided to ensure that the wireline tool and the bypass sub can be effectively removed from the well even in case of a malfunction of the motorized shifter means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.