Geoquip Marine • GMTR120 Geotechnical Drilling Rig Logo

Geoquip Marine • GMTR120 Geotechnical Drilling Rig

Product Snapshot
GMTR120 Geotechnical Drilling Rig
Geotechnical Drilling Rig
Geoquip Marine
Geoquip Marine designed, built and commissioned the Twin Ram Drilling Rig (GMTR120) in 2013, which complements the company’s existing fleet of geotechnical drilling rigs and enabled the expansion into deep water markets.

The GMTR120 geotechnical drilling rig is compatible with a wide range of wireline, downhole sampling, testing and logging equipment. This includes piezocone penetration testing (CPTU/PCPT), push/piston and percussion sampling, rotary coring, and P-S suspension logging tools. All can be run interchangeably without recovering the drill string. The GMTR120 is also capable of running Logging While Drilling Bottom Hole Assemblies to provide detailed geophysical, geomechanical, petrophysical and geological borehole data.

The GMTR120 is suitable for drilling, coring, sampling and testing in all soil conditions in water depths plus borehole depth of up to 2,500m with an option to extend to 3,000m.

Geoquip Marine's GMTR series rigs are a series of modular ram hoist type rigs designed to be easily mobilised onto vessels of opportunity. The parts are designed for shipping in standard open top containers.

The rig has an automatic pipe handling system, ram hoist system with twin wire suspension for safe and controlled handling of in-hole tools and 6m passive stroke compensation (improved sample recovery and quality).

The seabed frame can clamp onto the drill string and enable in situ testing with the downhole CPT. Furthermore, the GMTR120 is capable of lowering and hoisting the GMCPT200 seabed CPT system, which enables rapid execution of CPT surveys, especially for offshore wind farm projects.
Geotechnical Drilling Rig
Drilling System
  • Ram hoist system with twin wire suspension giving safe, efficient and compensated handling of all in-hole tooling
Heave Compensation
  • 6m stroke passive heave compensation (semi active under development) using nitrogen gas as compensation buffer with Olmsted valve slingshot protection
  • Seabed frame compensation 0.0m to 7.0m
Top Drive/Power Swivel
  • Top drive / power swivel - Edeco swivel
  • 19,400 N/M @ 0-120 rpm
  • 5,000 N/M @ 400 rpm
  • Breakout torque 22,500 N/M
  • Load capacity 120t capacity
Pipe Handling
  • Single range, two drill pipe handling using a proprietary mechanical handling system utilising pipe handling crane and pipe grabble
  • Remote operated iron roughneck and spinner
  • Proprietary catwalk system
  • Handles pipe with minimum manual intervention and hence improved safety
Hydraulic System
  • 2 x electro-hydraulic power packs of 310kW each
  • Hydraulic distribution from a control module beneath the centralised control cabin
Mud System
  • Project-specific modular mud systems installed as required
Rig Winches
  • Seabed Frame: SWL 32t; 3,500m; 36mm wire rope
  • Head Line: SWL 3t
  • Tail Line: SWL 3t
  • Sampling Winch: SWL 1.5t; 3,000m; 10mm wire rope
Drill Control Cabin
  • Proprietary designed control cabin for remote control via hydraulic/electric interface of all drilling and sampling operations
  • 3-man cabin for driller, assistant driller and PCPT/CPTU operator giving coordinated control of all drilling/sampling operations
  • Rig specific DMS recording
  • Derrick sections and modular components designed to be transported within standard open top shipping containers
  • Utilising a standard geotechnical drill string of Bottom Hole Assembly (BHA), drill collars, and 5½" API drill pipe, the 120t SWL gives a combined borehole and water depth capacity up to 2,500m.
  • Use of a aluminium drill string would increase this capability
In Situ Sampling & Testing
  • Can utilise 6⅝" API drill string to allow large diameter coring
  • Fitted with AP van den Berg downhole PCPT/CPTU, push/piston sampling equipment and wireline coring equipment
  • Fitted with 1,200m PCPT umbilical and winch capacity, which can be extended to 1,600m
Offshore Laboratory
  • Offshore geotechnical soil laboratory can be installed onboard as per project requirements
Related Equipment
The drilling rig is capable of conducting drilling, sampling and testing operations from a jack-up barge. A simultaneous drilling and casing system is operated with this rig - this being far more efficient in terms of time and equipment than traditional rod based drilling systems.... More

The wireline piston sampler or core barrel, and the casing are advanced together, ensuring a high quality sample recovery and a stable borehole. When full, the piston sampler or core barrel is 'delatched' from the lead length of casing, brought to deck level and the sample extruded horizontally.

Guar gum powder is used to form the flush medium during drilling operations. It is mixed with seawater, and the resulting ‘mud’ or flush is then pumped downhole, providing lubrication during drilling, stabilising the borehole and lifting away the cuttings from the base of the hole.

The nearshore spread can be mobilised with a geotechnical soil testing laboratory, allowing technicians and geotechnical engineers to determine soil classification and strength parameters for use in engineering during fieldwork operations. Testing that can be performed in the field laboratory includes: miniature vane, pocket penetrometer and torvane shear strength testing, bulk and dry densities, and unconsolidated undrained triaxial testing and full geotechnical field descriptions to BS 5930 or ASTM standards.

This drilling spread allows the acquisition of high quality data in real-time, which coupled with on board logging and laboratory testing, allows engineering analyses such as spudcan and pile capacity, to be conducted in the field.

Piezocone Penetration Testing (PCPT/CPTU) using AP van den Berg WISON-APB wireline CPT system can be conducted with this spread. It is a wireline system and can be used interchangeably with the sampling and coring barrel, giving the advantage of a flexible sampling and testing regime. As with the sampling and coring equipment, this wireline testing system ensures maximum efficiency during drilling operations. The 10cm² cone with a 3m stroke is an ideal tool to be used in soft ground, giving high quality data.

Parameters recorded by the cone are displayed in real-time on the acquisition computer, include tip resistance, sleeve resistance and pore water pressure. The stroke length during a test is measured by a calibrated flow cylinder.
The Geoquip Marine GMR600 offshore geotechnical drilling rig design is the product of over 30 years' experience of designing, building and operating such rigs. It is a fully heave compensated, offshore geotechnical drilling system. The principle of easy transportation and subsequent mobilisation on board a vessel of opportunity is one of the main design ... Morepremises of the GMR600. Based on ISO container sized dimensions, each derrick section is an approved shipping container, unique to this series.

The GMR600 is suitable for conducting drilling and sampling in all soil conditions up to 600m (water depth plus borehole depth) using steel API drill pipe. A drop in wireline core barrel is used where variable cemented materials are encountered enabling core samples to be obtained without the need to recover the drill string. All downhole tools are fully interchangeable within the single drill string and bottom hole assembly such that any sampling and testing regime can be accommodated.

The GMR600 rig has a Dando 1000 top drive power swivel capable of handling a maximum 6⅝" API drill string length of 700m. An 8 to 20t seabed frame is used to clamp the drill string to enable downhole sampling and in situ testing to be performed using a suite of downhole tools. The rig can be combined with Geoquip Marine's other equipment, including
Geoquip Marine have designed and built a fully heave-compensated, offshore geotechnical drilling system base around the GMR series. A major consideration in the design of the rig is to reduce mobilisation time and cost in logistically challenging locations by creating a set of simple system components which minimise the requirements for interfacing ... Morewith the vessels services.

The GMR300-type geotechnical drilling rig and associated equipment can deploy in excess of 360m of drill string. The GMR300 Series is configured to handle our standard drilling and down-hole sampling, coring and in situ testing tools. A comprehensive range of wireline downhole sampling and testing tools is available including wireline piezocone penetration testing (PCPT, piston sampling, push sampling, wireline core barrel, and percussion (hammer) sampling. All downhole tools (coring, sampling, PS suspension logging) are fully compatible within the 5½" or 6⅝" API drill string.
Contact Us
+41 71 227 40 00