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The Subsea Drilling System is intended for year-round drilling irrespective of climatic and ice conditions when developing oil and gas fields in the deep offshore areas of the Russian Arctic seas.
The underwater technology envisages use of the Subsea Drilling Systems, each comprising a Submarine Drillship (SDS) and a Bottom Template (BT) for operation at 60 to 400 m sea depth. The fields are supposed to be developed by drilling and construction of both single wells and clusters of 4 to 8 wells with subsea completions.
A dry-type drilling rig with an estimated stock of drilling consumables for construction of a 3,500-m deep vertical well is installed on the SDS. As for other wells, the consumables are replenished with the help of a submarine cargo-container delivery system. A system of shipboard and wellhead BOP equipment allows to conduct drilling operations under the standard atmospheric pressure in the SDS compartments. Underwater robotics perform outboard technological operations, while transport and rescue submersibles/vehicles of the external support system deliver personnel and conduct rescue.
The BT is a complete technological module, which serves as the base plate for the SDS and accommodates conventional operational equipment for wells with subsea completions.
The SDS is power-supplied and maintains communication with coastal command and control centers via an underwater cable. Onboard storage batteries serve as a standby power source.
Development of a pilot Subsea Drilling System will take five to seven years from the Engineering Design commencement and that of an industrial system - two to three years after the pilot system trials.
The safety-oriented approach to designing guarantees high reliability of the system and risk reduction, which is achieved, in particular, through the following intrinsic features:
- characteristics of the circulating drilling mud in the well are continuously computer-monitored with a view to prevent gas shows;
- a 100% hydraulic drive of primary drilling equipment operates with inflammable fluid;
- drill cuttings are stored in the BT cells;
- the SDS is capable of independent emergency surfacing by breaching the ice cover of up to 3 m thick without inflicting any damage to the hull.
No foreign analogues are available. Priority of Russia.
The method and the production system have been patented.
|Length overall, m||98,6|
|Beam overall, m||31,2|
|Height overall, m||32,5|
|Normal displacement, m3||23000|
|Life-support endurance, days||60|
|Drilling-stock endurance, wells||1|
|Operating diving depth, m||60…400|
|Max. well drilling depth, m:||6000|
|Drilling rig||Arktika 3500/400|
|Number of wells||8|
|Summary volume for dumping, m3||2х2990|
|Volume of hydraulic modules and operational equipment, m3||2х1440|
The non-self-propelled floating research jack-up platform (FRJUP) is intended for engineering & geologic survey of the sea bottom with the use of the UBR-12V drilling rig.
The platform is intended for operation in the northern water areas of the Caspian sea and the Tatar strait with a sea depth from 1.5 to 20.0 m during the ice-free season.
The platform operation is assisted by a support vessel. The platform staff is accommodated on the support vessel and is delivered to the platform by a shuttle boat. The platform facilities ensure staff transfer at the wave height up to 1.5 m.
The platform consists of separate modules and components the size of which ensures their transportation by railway and road. The FRJUP is finally assembled in the sheltered water area close to the planned work site.
Full service life - 20 years.
Term of delivery - 1 year.
The Mobile Drilling Rig (MDR) has been designed within the shortest time possible by the Lazurit Central Design Bureau OJSC and built at K.Marx Astrakhan Works with the use of available facilities.
The MBK-125 mobile system for well repair updated to drill wells up to 2,000m deep and adapted for application on the Mobile Drilling Rig has been applied as the drilling system.
Two pontoons being part of the metal wharf for large ships have been used as the Drilling rig substructure.
Each pontoon has two securing devices in the form of legs launched and deepened into the ground with the aid of electro-mechanical jack-ups.
The MDR caisson has been formed by two pontoons of 41.9 х 13.1 х 2.7 m (L x B x H) size joined over the long side by a 2.5 m wide connecting bridge (Pontoon No. 1 is the left , and No. 2 is the right one).
The depth of the operating area is from 0.8 to 1.7 m, wave height –about 1m. Positive water setup to 0.7 m is possible. The current speed is 0.5m/sec, the wind speed is about 21m/sec, air temperature - from + 40оC to 0о.
This is a submersible structure. It is launched to the sea bed by filling special ballast tanks with sea water.
All deck modules and primary equipment on the MDR deck are installed on the foundations of 750 mm height and are connected by transfer bridges.
The pontoon holds accommodate:
- Pump spaces;
- Tanks for:
- Oily water;
- Drilling rig fresh water;
- Drill Rig leaks;
The MDR is operated, while escorted by support vessels that carry out the following operations:
- MDR towage, installation and removal to/from the work site;
- Provision of the MDR anchorage;
- Provision of accommodation and meals for the MDR personnel;
- Personnel evacuation from the MDR;
- Delivery of consumables and take-off of waste;
- Delivery of the guiding gear anchors to the work site;
- MDR communication with the shore.
The MDR is equipped with a circulation and cementing (grouting) system delivered as units/modules, as well as with a mooring and a towing gear, the required rescue equipment, masts for navigation lights and radio communication aerials.
A device for homing to the work site is installed on the MDR. It consists of four electrical winches, steel ropes and four anchors that are to be stored at the anchor delivery vessel.
The drilling rig is installed in the derrick of 6.0 m height, combined with a work platform above the 2.6 х 2.5 m moonpool.
The MDR electrical power system consists of the following components:
- A package of a diesel-electric plant with two units (one of which is stand by) of 60 kW each for power supply of ship consumers (a ship electric power plant);
- A package of a diesel-electric plant with a 315 kW unit that supplies power to the drilling rig facilities and equipment, as well as to the ship consumers in the drilling mode and in the mode of the MDR ballast tanks’ filling/drainage;
- Two independent main power networks (380/220 V AC, 3-phase, 50 Hz) of the ship and process systems;
- Jumpers between the networks that supply power to all consumers from one source;
- A 24V DC emergency ship power network;
- An illumination electric network;
- Signal & navigation lights.
The MDR stability at transportation in all operational loads meets the requirements of the Russian River Register of Shipping.
The MDR has been operated in conformity with the following modes envisaged by the project:
- Towage to the installation site with a draft of about 1 m at a speed up to 4 knots, at the wave height of 1.5 m as maximum and wind speed of not more than 15 m/sec.;
- Installation at the work site with the aid of a homing device;
- Descent of the MDR hull to the ground due to water ingress to ballast tanks;
- Securing the MDR with the aid of fixing devices;
- Take-up of consumables from supply vessels;
- Drilling operations with provision of environmental safety;
- Well testing, while meeting all safety requirements.
- The MDR unloading and removal from the work site carried out after the well shut-down by an abandonment (cement) plug, removal of the wellhead connector and cutting of the well riser at a level not more than 300 mm from the water surface.
The Shallow-water Ice-resistant Gravity-based Platform is intended for operational drilling in offshore areas at depth from 5 to 10 m.
The design and technological solutions ensure manufacture of the platform from reinforced concrete in the non-freezing water area of the Kola bay.
The completely assembled platform with a draft of 4.5 m is towed to the installation site where it is ballasted and acquires the total weight of about 900000 tons required for generation of gravity force that counter-acts the shifting efforts produced by the shoreward thrust of drifting ice.
It is installed at a depth of 35 m to implement the following functions:
- As the command center to control drilling and operational works at the field;
- As the depot for replacement of submarine drill ship crews;
- As the field power supply plant;
- As the repair and preventive maintenance center for underwater technical works;
- As location of transport and rescue submersibles;
- Transportation of rotating crews from submarine drillships, repair teams and performance of emergency rescue operations;
- Disposal of gas show products while drilling wells;
- Failsafe communication with the outer world and subjects of the production process.