Method and apparatus for determining subsurface conditions using a tubing packoff tool
US4674328A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1985 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Jul 19, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/087
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method and apparatus are provided for permitting an instrumentation package to be repeatedly locked and unlocked at any number of desired depths inside a subsurface production tube for the determination of the shut-in physical conditions at those depths. An instrumentation package is located below a tube packoff tool. The instrumentation package and tube packoff tool combination are lowered into the tube. At the desired depth, a longitudinal force is exerted on the tube packoff tool, causing the tube packoff tool to wedge against the inside of the tube, locking the tube packoff tool at that depth, and creating a seal which isolates the instrumentation package below. The instrumentation package then begins its determination of the shut-in physical conditions inside the tube at that depth and transmits the acquired data to a surface recording and processing facility. When sufficient data has been collected, the tube packoff tool can be unlocked by relaxing the upward force on the tube packoff tool, breaking the isolating seal, and unlocking the tube packoff tool from its position inside the tube. At this point, the tube packoff tool and instrumentation package may either be taken t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.