Device for exploring an underground formation crossed by a horizontal well comprising several sensors permanently coupled with the wall
US5801642A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 15, 1996 |
| Grant date | Sep 1, 1998 |
| Priority date | — |
| Expiry date | Oct 15, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/01
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention relates to a device for exploring an underground formation crossed by a well, suited to work in well portions where the advance thereof under the effect of gravity is difficult, notably in horizontal well portions or in well portions greatly inclined to the vertical. A plurality of rigid exploration modules (Mi) are interconnected end to end, each one including a rigid pipe (1), a flexible leaf (11) fastened to each pipe (1) so as to press against the wall of the well at least one box (18) containing sensitive elements, a linking cable (32) connected to a surface central station (40), and a connecting block (26) comprising an acquisition system (37) connected to the various modules (M1-Mn) by a bundle of electric conductors running through the tubular elements (1), and a deferred electric connection useful in damp conditions between linking cable (32) and the acquisition system. The connecting block is interposed between the array of exploration modules (M1-Mn) and a rigid string (39) connected to the surface operating device (38) for driving the exploration assembly into the well portion. The invention may be used for seismic prospecting for example.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.