Skip to main content
Oil and Gas
OilTec provides welding, hardfacing, hardbanding and surface engineering services, together with cost-effective OEM parts manufacturing.

Choose a category

The journey of Oil

Mud motor rotors

The crude petroleum and natural gas industry is made up of establishments engaged in operating oil and gas field properties. Such activities include exploration for crude petroleum and natural gas, drilling, completing and equipping wells, operation of separators, emulsion breakers, distilling equipment, and and all other activities necessary to making oil and gas marketable up to the point of shipment from the producing facility. This industry also includes the mining and extraction of oil from oil shale and oil sands, and the production of gas and hydrocarbon liquids through gasification, liquefaction, and pyrolysis of coal at the mine site.

Coatings for demanding environments

Asset life extension of up to x 100

The advanced Castolin Eutectic workshop in Newcastle, UK is a well established provider of coating solutions into some of the most demanding environments encountered by the Oil and Gas exploration industry. Castolin Eutectic applications include solutions for Directional Drilling applications and Wash Out problems encountered in other drilling operations. Coatings have proven field data showing asset life extension of up to x100 when compared to traditional solutions.

Directional Drilling

  • Mud Motor Rotors
  • Stub welding (box and centre)
  • Stabilisers, Adjusting Rings
  • Bearing Housings
  • Jar Mandrels
  • Rebuild of Rotary Stearable Drive Shafts
  • Rebuild of Rotating & Reciprocating Parts

Maximize your rotor life, reduce replacement costs

Applied to new and used mud motor rotors
  1. Strict HVOF powder quality control from Castolin Eutectic, the world’s leading powder manufacturer
  2. Inspect damaged part and prepare for processing.
  3. Strip and repair rotor defects.
  4. Prepare the surface by grit blasting, critical to maximize bond strength.
  5. Deposit cermet or carbide composite coatings using HVOF process derived from aerospace industry specifications.
  6. Polish with diamond abrasives, smooth finish reduces friction.
  7. Inspect and measure coating quality during process (Porosity: Less than 1%, Oxides: Less than 2%, Micro Hardness: Greater than 900 Hv, Less than 1300Hv)
  8. Apply proprietary sealer to fill micro-porosity.
  9. Complete densification process to increase toughness and completely shield rotor from high chloride, corrosive environments.
  10. Finished rotor ready for service (surface finish to customer specifications or min. 0.5 µm)

Rebuilding, crack welding, heat treatment and wearfacing

  • Inspection, service and maintenance of all stabilizers used in the drilling industry
  • Non-mag stabilizer specialist
  • Body repair and crack welding, heat treatment and wear protection with wolfram carbides
  • Coatings include tungsten carbide rods and tungsten carbide tiles
  • Applicator of non-mag special coatings, including laser coating
  • Approved and certified Quick-Tip applicator
  • Rebuilding and adaptations
  • Big offshore grinders for handling of bodies up to 10 tons and 6m length, OD up to 48 inches
  • Repair of all drilling stabilizers in non-mag and steel

Massive components with flawless surface finishing

  • Precision grinding with diamond wheel CNC controlled grinding machines
  • HVOF thermal spray with wolfram carbide coatings
  • Surface polishing 
  • Diameter up to 630 mm, 3000 mm length and total weight up to 3 tons

Today’s drilling challenges


As average well depths have increased over the past decade, directional and extended-reach drilling have become more commonplace. These wellbore trajectories, with their highly deviated paths (ERD) and associated increases in torque and drag, have exerted unprecedented force on the drill pipe, surpassing all previous stress level limits. These trajectories in turn, create severe wear conditions on both the casing and drilling string, which is becoming increasingly detrimental for drilling operations.

Avoid catastrophic tool joint failure


Hardbanding has long been acknowledged as an effective means of preventing tool joint wear. During the 1990’s, tungsten carbide-based hardbanding was in widespread use and was determined to be the primary cause of casing wear. However the absence of hardbanding, while slowing casing wear to a small degree, allowed the tool joints to wear at an accelerated rate, lessening the torsional capacity of the drill pipe and putting drilling operations at a serious risk. The challenge was to discover a balanced, simultaneously effective solution between both casing wear defense and tool joint protection, which is caused by the worsening conditions associated with highly deviated ERD wells. Previous casing friendly alloys reduced casing wear, but produced unacceptable tool joint wear as a consequence. Crack-prone design flaws were also present, as widespread cracking of the alloy material often ensued. This caused catastrophic tool joint failure and in some cases, even the failure of the hardbanding itself, due to tool joint spalling.

All formulated and manufactured in our own modern plant in Ireland

OTW range of high performance cored wires

Castolin Eutectic has been performing hardbanding in the Norwegian market for more than 15 years. Due to excellent co-operation between Castolin Eutectic and Statoil, there has been very successful development, use and approval of our innovative OTW alloys. Today Statoil approves OTW 12Ti, OTW 16XS and the non-welded, patented MX5 coating for drilling. During development of the OTW range, Castolin Eutectic constructed its very own, unique hardbanding C-Wear testing machine. The machine tests encompass:

Casing material combined with full-size, hardbanding alloy-infused wear samples

Specific mud parameters, measuring tool-joint, open hole and casing wear rates.

Established hardbanding coating friction dynamics.

In addition to this, we use an automated Micro Hardness Machine, a G65 Abrasion Wear-Test Machine and ICP / XRF Chemical Analysis Units, employing a well trained, customer-oriented technical team. Our global crew of highly qualified engineers tests OTW products on active field components, under the most extreme drilling conditions. These harsh environments provide the necessary criteria for understanding severe wear phenomena and set the standard by which we measure our product integrity.

Specialist in non-mag steel coating solutions

Wear Sleeves
  • New production of wear sleeves and stabilizers for steerable drilling systems, logging systems, MWD tools, LWD tools, drilling motor sleeves
  • Industry leader and specialist in non-mag steel coating solutions including laser cladding
  • Coatings include tungsten carbide rods and tungsten carbide tiles
  • Approved and certified Quick-Tip applicators
  • Short delivery of non-mag wear sleeves; non-mag materials at stock at all times to allow for short delivery times and on-demand special solutions
  • Sizes up to 17 ½ inch: special solutions on request.

2 to 7 times longer service life than the original material

Cutter wheels

The cutter wheel designs we provide include both straight and twisted teeth. The number of teeth, angles and shapes vary. The Trio OilTec Services unique solution of special base materials, heat treatment, combined with wear resistant coatings significantly extends cutter wheels service life. Experience shows that our cutter wheels last 2 to 7 times longer than the original material and existing coatings on the market to day.
With these designs and material choice, the wear on the "Hole Opener" saddles is simultaneously reduced. This is due to the fact that cutter wheels have better wear resistance and the contact to saddles becomes less aggresive. In addition, the speed of hole opening increases.


  • Longer life of cutter wheel
  • Less wear on "Hole Opener" body/saddles
  • Reduced maintenance cost
  • Faster hole opening

We deal with large-scale parts up to 10 tons

Hole Opener
  • Inspection, service and maintenance of hole openers and large drill bits
  • Body repair, heat treatment and wear protection with wolfram carbides
  • Rebuilding and adaptations
  • Own production of high quality cutter wheels
  • Handling of bodies up to 10 tons and  6m length

Service, maintenance and wear protection

Drill bits
  • Inspection, service and maintenance of  matrix and steel-bodied drill bits
  • Silver brazing of diamond inserts
  • Redressing of cutter wheels
  • Shoulder wear protection

We are approved applicators for precision dressing

  • Redress of all different downhole mills
  • Procedures for applying tungsten carbide brazing
  • Silver brazing with diamond cutters
  • Approved applicator for precision dressing with cutting inserts, wolfram carbide and diamonds

HVOF thermally sprayed with wolfram carbide coatings

Stinger pistons
  • Precision grinding with diamond wheel CNC controlled grinding machines
  • HVOF thermal spray with wolfram carbide coatings
  • Super polishing
  • Procedures established for applying high quality coatings on all stinger pistons used as part of plug systems
  • Diameter up to 630 mm, 3000 mm length and total weight up to 3 tons

Protected by HVOF coatings

Ball valves
  • HVOF Thermal Spray with wolfram carbide coatings
  • Electroplating for selective spot repair and coatings for wear and corrosion protection
  • Ball valve grinding to the finest tolerances
  • Super polishing and lapping

Unmatched wear resistance for mandrels up to 3 tons

Sprayed mandrels
  • Precision grinding with diamond wheel CNC controlled grinding machines
  • HVOF thermal spray with wolfram carbide coatings
  • Super polishing 
  • Procedures established for applying high quality coatings on all mandrels used in the oil & gas industry, including jars, gas-lift mandrels and packer mandrels
  • Diameter up to 630 mm, 3000 mm length and total weight up to 3 tons
Find your technical expert

Discover other industries

Sharing our welding, brazing and coating know-how
OTW 12Ti