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  • Drilling
    Rig Support



    For many years, EEIS has provided engineering support for a wide variety of drilling rig projects, ranging from area classification studies to rig and facility structural modifications.
  • Drilling
    Rig Support




    For many years, EEIS has provided engineering support for a wide variety of drilling rig projects, ranging from area classification studies to rig and facility structural modifications.
  • Drilling
    Rig Support




    For many years, EEIS has provided engineering support for a wide variety of drilling rig projects, ranging from area classification studies to rig and facility structural modifications.

Rig 27E Modifications, North Slope, Alaska

EEIS Consulting Engineers, Inc. (EEIS) provided structural engineering design for several modifications to Nabors Drilling Rig 27E, including a load increase of the cellar trolley from 15 to 20 tons and modification of the overhead crane beam bracing to allow the installation of a larger-diameter flow line. EEIS verified the capacity of the existing draw works trolley and provided a letter confirming its structural capacity. EEIS analyzed the Blow Out Preventer (BOP) stump and developed a detailed procedure for setting the BOP on the stump when moving the drilling rig. The engineering work included taking as-built measurements, making hand calculations, making calculations with RISA 3D structural analysis software, reporting results, and creating design drawings.



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Blow Out Preventer Lifting Ring, North Slope, Alaska

EEIS provided structural engineering design of the Blow Out Preventer (BOP) lifting ring. The new lifting rig would allow the BOP to swivel when lifted by the draw works crane. The BOP lifting ring cradled the bowl-shaped hydril at the top of the BOP stack. The challenge was the client specification of a weight limit less than half of what BOPs typically weigh. EEIS used RISA finite element analysis to minimize steel quantities and to put steel where it was needed to carry the load. EEIS provided steel fabrication shop drawings.


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Rig 16 Modification, North Slope, Alaska

EEIS provided structural engineering for many of the structural modifications to Doyon Drilling Rig 16. Work involved conducting field investigation around the cellar of the rig and developing working drawings for the modifications. The modifications to the cellar included designing a sliding adjustable wall system that could be adjusted into two different wall configurations to allow for the different well spacing encountered at various drill pads. EEIS designed a new trolley/hoist track system and a manlift for maintenance around the BOP. The cuttings flow lines from the rig floor were rerouted to the shaker room.


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Multiple Rig Piping and Instrument Diagrams, North Slope, Alaska

EEIS completed on-site assessments and produced AutoCAD drawings of as-built Piping and Instrumentation Diagrams (P&IDs) for mud systems at five drilling rigs: Doyon Rigs 25, 16, and 14 and Nordic Calista Rigs 1 and 2. The schematic P&ID drawings showed piping and equipment details.


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Doyon Rig 25 Blast Proof Office, North Slope, Alaska

EEIS provided the architectural/life safety design and structural engineering for a 1,600-square-foot modular office for Doyon Drilling. The office consisted of four steel-framed modules bolted together. The structure was designed for a 3-pound-per-square-inch (psi), 70-millisecond (ms) blast criteria. The offices were supported on a steel frame above the Casing Complex for the rig.


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Rig 33E Northstar Modifications – Mud Processing Module Modification, Northstar Island, North Slope, Alaska

EEIS provided structural engineering and construction support for many of the structural modifications to Nabors Drilling Rig 33E for both Badami and Northstar. Design work included reconfiguring the mud processing module, adding a drag chain enclosure, enlarging the mud pump area, adding a new exterior staircase, adding a cantilevered utilidor, and calculating soil-bearing pressures below the rig.


Varied Designs, Rig 22E, North Slope, Alaska

EEIS provided structural engineering for various projects at the Nabors Drilling Rig 22E. The projects included a push bar, a snubbing post, a radiator platform, a Blow Out Preventer (BOP) landing winch base, and a manrider/tugger pedestal. The push bar was designed to serve as a reinforced point to push the rig along the red iron with a large Cat. The new snubbing post was a replacement post for an earlier inadequate design. The radiator platform was a replacement support platform to accommodate a larger radiator for the hydraulic system. The BOP landing winch base was for a new hydraulic winch to replace an existing mechanical winch. The manrider/tugger pedestal was a new pedestal to satisfy the requirement for the hydraulic tugger to be rated for manrider use.

Other Representative Rig Support Projects


  • Forest Oil Corp. Stairwell Storage, Osprey Platform, Cook Inlet, Alaska
  • Nabors Alaska Drilling Inc., North Slope, Alaska
  • o Rig 19AC Oooguruk Conversion
  • o Rig 28E Transformer Skid, Blow Out Preventer (BOP) Spacer
  • o Rig 33E BOP Swivel Lifting Bracket
  • o Rig 27E Derrick Bridal Line Roller
  • o Rig 004ES Stabbing Board Platform Evaluation
  • o Rig 245 Shaker Room Roof Support
  • o Rigs 7 and 9 Area Classification Study
  • Doyon Drilling, North Slope, Alaska
  • o Rig 15 Proposed Stabilization Pads
  • o RIG 141 As-Built Drawings