57 Svoboda street,
Nizhny Novgorod

Phone: (831) 273-00-69 Fax: (831) 273-84-00 Email: cdb@cdb-lazurit.ru
SUBSEA DRILLING SYSTEMS
Drilling System for Year-round Drilling in Deep Offshore Areas of Russian Arctic Seas

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:

No foreign analogues are available. Priority of Russia.

The method and the production system have been patented.

Submarine Drillship

Length overall, m 98,6
Beam overall, m 31,2
Height overall, m 32,5
Draught, m 9,7
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

Bottom Template

Length, m 123
Beam, m 30
Height, m 15
Displacement, m3 8900
Number of wells 8
Summary volume for dumping, m3 2х2990
Volume of hydraulic modules and operational equipment, m3 2х1440
SURFACE DRILLING SYSTEMS
Floating Research Jack-up Platform (FRJUP)

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.

Mobile Drilling Rig to Drill Exploration Wells in Super-shallow Waters Offshore of the Northern Caspian Sea

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:

The MDR is operated, while escorted by support vessels that carry out the following operations:

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:

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:

Shallow-water Ice-resistant Gravity-based Platform

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.








Ice-resistant Support Technological Platform

It is installed at a depth of 35 m to implement the following functions:



cdb@cdb-lazurit.ru

Lazurit Central Design Bureau Joint-Stock Company, 57 Svoboda street, Nizhny Novgorod