The ADR is recommended whenever there is a risk that wireline tools or guns may become stuck downhole. Typical applications include wireline interventions in deviated wells, ballistic operations, and operations in gas wells (where the coefficient of friction is typically high).
The Downhole Release Tool separates into two pieces on the command of the surface panel. To initiate a release, a strict protocol must be followed within a limited time period in order to prevent accidental use. Once unlatched, the upper section (including the main tool body and electronics) is pulled out of the hole with the wireline. The lower section remains downhole with a standard 1 ¾ “ fishing neck (ADR003) for subsequent easy retrieval. Both components of the separated tool are fully sealed in order to protect the tools above and below from being flooded with well fluid.
The robust surface panel (the ADRP) controls and monitors the position of the ADR in real-time, so the tool status is always known rather than assumed.
A full wellsite function check includes unlatching the tool before the job. In order to reset the tool, the two are simply pushed together and re-latched sections.
The mechanical release mechanism has three distinct stages:
- Electrical feed-through isolation
- Mechanical unlatch
- Hydrostatic pressure equalisation and tool separation
Since the electrical feed-through is isolated, any tools above the ADR will continue to operate as normal after unlatching. For example a CCL can be logged while pulling out of hole.
- Standard 1.75 in. (ADR005 and ADR003) and 1.374 in. (ADR001) fishing necks , designed for easy retrieval
- Full pre- job function check (latch/ unlatch) recommended at wellsite
- Robust telemetry suitable for both long and short wireline
- Three-stage controlled release process monitored in real-time
- Tools above ADR continue to function after release
- Design incorporates fail – safe logic to prevent accidental release
- Qualified for shock and vibration
- Feed – through conductor rated for high voltages and currents