Firing trigger apparatus and method for downhole tools
US7802619B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 2008 |
| Grant date | Sep 28, 2010 |
| Priority date | — |
| Expiry date | Mar 26, 2029 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/1185
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Methods and devices are provided for controlling detonation of explosives in a well bore for perforation or a well bore casing, which avoid or reduce unintentional or undesirable detonations while ensuring or increasing desirable detonations. An explosive trigger system or tool may comprise a central processing unit (CPU), memory, and one or more sensors disposed for measuring one or more downhole conditions. Downhole conditions may be measured with the sensor and then used to program detonation parameters (such as temperature or pressure) or preconditions (such as time or distance traveled) to the trigger system. Detonation can only occur when the programmed parameters or preconditions are satisfied. In this way, undesirable detonations are avoided by requiring certain preconditions to arming the trigger system. To further control arming and/or detonating, a line sequencer may be provided, wherein energy is propagate down along the physical deployment line as pulses or line “jerks” through mechanical manipulations of physical deployment line near surface. These pulses can form signals for downhole control of the trigger system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.