Onshore Modular Land Rig

The Challenge:

CCI wanted to expand their onshore drilling & workover assets by developing a fully modular onshore drilling rig.

The Solution:

Cube Offshore were engaged to develop the conceptual structural design.

The modular drilling rig complied with the following codes & standards:

• API Spec. 4F – Drilling & Well Servicing Structures
• NZ1170:5 – Earthquake Actions – New Zealand
• DNV-ST-E273 – Portable offshore units (lifting strength R30)
• NZ Transport Agency – Factsheet 53a, Overdimension vehicles and loads

The drilling rig comprised of the following modularised units.  All of which complied with the road transport requirements of New Zealand and DNV 2.7-3 R30 lifting requirements.

• Upper Module
• Mid-2 Module
• Mid-1 Module
• Lower Module
• Sub-base Module
• Spacer Modules (x4)
• Skid Beams (x2)

Jacking Loads = 460,000 lbs

BOP on skid cart = 35t

Total weight estimate = 162.5t

The Scope:

The following was delivered as part of an integrated project approach:

• Basis of Design & Functional Specifications
• Concept development
• Staad.Pro structural analysis
  • Operating
  • Storm – Expected
  • Storm – Unexpected
  • Seismic
• Navisworks 3D model

GA & Elevation of Land Rig Concept

BOP Skidding Capability

3D Navisworks Model

 

The Challenge:

CCI own a Hydraulic Workover Unit (HWU) which they deploy offshore onto production platforms for cost effective down-hole intervention.  Upcoming onshore contracts required an Onshore Support Base to be designed & fabricated to support the HWU on land over the well head.

The Solution:

Cube Offshore were engaged to develop the concept and carry out detailed structural design of the Substructure.

The arrangement comprised the following components:

• 4no. corner Support Pods to transfer loads into the ground
• 2no. Spreader beams to span between the Support Pods and provide support for the loads above
• 1no. Sub-Base Module sitting atop the Spreader Beams:
  • Supporting the 191t jacking loads
  • Supporting a 35t BOP
  • Support the HWU tower above c/w all dead, personnel & functional loading
• All components were configured to be road transportable throughout WA without the need for a pilot
• All components were liftable in accordance with DNV 2.7-3 R00 requirements
• Ease of assembly with minimal use of bolting, instead adopting clamped, bearing and turnbuckle connections
• Design compliance with API Spe. 4F – Drilling & Well Servicing Structures

The Scope:

The following was delivered as part of an integrated project approach & full collaboration between design engineering, fabrication and client:

• Basis of Design & Functional Specification
• Concept development
• Detailed engineering design & 3D modelling
• Fabrication drawings, dxf files and NC files
• Fabrication support
• Assembly procedures

 

       

1. Staad.Pro structural analysis                                                                  2. Staad.Pro 3D model

 

   

3. AutoCad 3D model exported to Navisworks                4. Completed structure assembled for operation

 

 

5. BOP suspended under Sub-Base Module