Section Milling

Section Milling is a job for Medusa®

Medusa® section milling and cutting technology were developed to meet the need for a cost-saving, permanent and verifiable 360-degree barrier to be placed in the wellbore without the need to cut/pull and dispose of casing strings or conduct lengthy and expensive pilot milling.

The Ultimate P&A Solution

Sustained Casing Pressure (SCP) existing between multiple casing strings in a well presents an enormous challenge for the Operators when abandoning a well. Often, SCP is present in multiple casing annuli, requiring multi-string section milling to mitigate. Some of the key challenges to a successful single or dual string section milling operation are:

  • Eccentric casing strings, either cemented or uncemented, can result in “skimming” or “troughing” of the outer casing, often resulting in a more complex, costly abandonment.
  • Inadvertently “puncturing” the outer casing string, thereby compromising the integrity of the wellbore and introducing more complexity and cost to the operation.
  • Limited expansion ratios that require smaller ID casing strings to be physically removed from the wellbore before gaining access to the larger casing strings harbouring SCP.
  • Flush joint and semi-flush joint casing connections are difficult to mill through in eccentric casing scenarios due to limited standoff and strict adherence to be non-damaging to the outer casing.
  • Centralisers in casing strings to be section milled can often be problematic to section milling tools and require patience to mill up without compromising casing integrity or BHA integrity.
  • Swarf created by section milling is reduced but can still be challenging if not managed efficiently. Swarf left in the well needs to be periodically pushed to the bottom. The swarf circulated to the surface needs to be removed entirely from the circulating fluid to mitigate erosion.
  • It is not uncommon to meet an obstruction in an old well that precludes further section milling progress downward. This could be catastrophic if the regulatory casing window length for permanent P&A has not yet been accomplished. There are no easy means to extend the casing window in an upward direction.

Solution

Through experience and technological advancement, Romar-Abrado’s unparalleled suite of Medusa® section milling tools and Swarf handling system address all of the above challenges related to single and dual string section milling of windows, providing the safest route to success for achieving permanent and verifiable P&A.

Medusa® technology

Medusa® enables dynamically stabilised single and multiple string section milling while ensuring no harm to outer casing strings, regardless of casing eccentrics. 

LEARN MORE
MEDUSA SINGLE-STRING / CONVENTIONAL SECTION MILLING
MEDUSA MULTI-STRING SECTION MILLING
MEDUSA SLIM

Contact us

Located between Aberdeenshire and Louisiana, Romar-Abrado enjoys a global presence. Operating across six continents, we offer a unique and effective service to clients worldwide.

Eastern Hemisphere

Aberdeen, UK

Address:

  • Newmill
  • Newburgh, Ellon
  • AB41 6AP

Phone:

Email:

Western Hemisphere

Broussard, LA, USA

Address:

  • 105 Nova Drive
  • Broussard, LA. 70518, USA

Phone:

Email:

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