Plug & Abandonment

Casing Removal


Well abandonment operations are some of the most complex and uncertain operations in the well life cycle. They are likely to deviate from plan and then require reactive, corrective responses that give rise to increases in risk, time and cost.

The challenge is to remain on plan during casing recovery operations, while not being too conservative in the well planning process, while also maintaining an “as low as reasonably practicable” (ALARP) risk philosophy in well operations.


Removing casing introduces operational risk on many levels:

    Complex abandonment operations add time, cost and risk and lead to an increased chance of failure to recover or remove the full interval of casing.

    Planning for an activity that has a low probability of success and then reverting to a cumbersome, multi-sequenced, risky activity that adds time and cost.

    Committing to an activity that may not be ALARP but cannot be reversed out of later e.g. section milling poorly bonded casing.


HydroVolve HAMMER used in planned casing recovery operations promotes an “as low as reasonably practicable” (ALARP) risk approach. The HAMMER delivers on the philosophy of operational simplicity, resilience, precision and control, whilst providing the best chance of success in the planned recovery of casing by delivering unimaginable extraction power to remove the casing.

HydroVolve HAMMER is far superior to any fishing or drilling jar; far greater in dynamic capability to jacks whilst being shorter, simpler and faster to deploy.

HydroVolve HAMMER is compatible with 3rd party single-trip cut and pull systems.

HydroVolve HAMMER can deliver staged, precise variable impact force and frequency to significantly improve the chances of stuck casing recovery. All controllable from surface by the driller, it enables:

  • unparalleled pulling and impact forces to break settled solids and destroy cement bonds
  • the ability to induce resonance to the casing on a scale way beyond any other agitating or vibro-jacking system to significantly increase the dynamic action on stuck structure
  • impacts to be delivered directly to the stuck casing and at rates 2,500 faster than those of conventional jars, vastly improving the chance of recovery
  • the ability to combine high overpull forces with high frequency vibration to deliver the most effective stuck-object extraction force regime available to the stuck casing.

MonoVolve REDUCER, when placed across build sections, allows a significant increase in pulling force to be transferred to the stuck casing whilst protecting the host casing and drill pipe from damage and wear and also reduces the torque burden in the drill string and top-drive system.

EvoLOG the BHA provides invaluable dynamics data capture directly from the BHA to allow assessment of actual performance of the retrieval BHA allow future deployments to be planned with confidence – improving efficiency and saving significant NPT and cost.

Wellhead/Subsea Infrastructure Removal


Marine growth or interference issues leading to ‘mechanical seizure’ and rendering conventional planned recovery of subsea infrastructure unlikely or unsuccessful.


  • Inability to use conventional recovery methods and tooling leads to incremental recovery risk, time and cost
  • A deviation from planned recovery due to mechanical seizure leads to increased risk, time, cost or even an aborted campaign


Pro-active planned introduction of HydroVolve HAMMER promotes an “as low as reasonably practicable” ALARP risk philosophy. The HAMMER’s resilience, precision and control provide the best chance of success in the planned recovery of stuck objects for subsea infrastructure removal operations.

It allows for staged, precise variability in impact force and impulse to significantly improve the chances of stuck object recovery. All controllable from surface by the driller, it enables:

  • unparalleled pulling and impacts forces and impulse frequency to break static friction and bonds
  • precision controllability and absent of recoil, so it can be confidently and safely deployed at surface