... ABSTRACT Autonomous systems hold promise for reduced cost and more environmentally friendly subsea control systems. A Long Range Remotely Operated Vehicle is described which provides a simple control system option based on extensions of field proven technology INTRODUCTION In order to reach...

... ABSTRACT Hydraulic, Electrohydraulic and Multifunction umbilicals form a critical and key component in Subsea Oil and Gas production systems. A recent Government report has documented evidence which supports the longstanding concern of operators, contractors and regulators over...

... SUMMARY The use and application of meteorological data in support of the offshore oil and gas can assist In all aspects of operations. From the use of climatological data for pre-operational planning or for design purposes through to real-time weather forecasts for ongoing and weather...

.... The systems electrical power subsea is produced by a Turbine Generator fitted to a water injection flowline or alternatively a Thermo-Electric Generator fitted to a production flowline. Hydraulic power for operating wellhead and downhole safety valves IS produced from a subsea unit, with communication signals...

... ABSTRACT In an ideal world risks can be avoided by careful analysis at the pre-contract stage of risks which may arise. However even in the best prepared and managed operations, accidents will happen. Risk management involves the apportionment of risks between the parties involved in contracts...

... Downhole maintenance or logging on subsea wells in the North Sea has typically required the operator to give inhouse budget approval for the large amounts of money needed to mobilize and operate a semisubmersible drilling rig with its attendant towing, anchor handling and standby vessels...

... 1DOCKING PROF Fig. 15 Separate lift line and umbilical The list of required tasks is determined largely by company operating preferences. To translate this into a list of operationally achievable tasks requires that the design and interfacing be undertaken prior to installation. Retrospective intervention...

...-independent when operating in deep waters. Dynamic positioning rather than anchors will be used for station keeping, and a marine riser will not be required The use of a pressurized winch on the top of an 18m directly-coupled lubricator reduces operating problems and enhances safety. Norsub A/S in conjunction...

... that the SSV is a safe, economic and comfortable system As described in other contributions, the submarines can be used for a variety of tasks and offer many operational advantages such as performance of work on the spot and independence of weather and also economical advantages such as low-cost operation...

... that could be tied back to these installations the economics drove the industry to install the trees directly on the seabed, and so offshore engineering moved towards equipment specifically tailored for subsea operation, and which has become increasingly removed from the original land-based concept. Over...

... INTRODUCTION The use of variable-speed drive units (VSD) specifically designed for use with electrical submersible pumps (ESP) in the recovery of crude oil has been well established. The main advantages of such drive systems is greater pumping flexibility, soft start operation and automatic...

... length and relatively small diameter of the supply hose gives it a high resistance to flow The stored energy in the umbilical hydraulic hose can be used to meet the demands of subsea valve actuator operations, reducing the number of subsea accumulators necessary. The difficulty in making use...

... established. REQUIREMENTS The valve must have a longer operational life than current valves. Internal leakage in service is to be avoided or minimized. It must be able to stand alone in a subsea pipeline without cover and allow repair and maintenace without flooding of the line. The valve...

... rigid, large pipelines. The CAPJET concept was based on the philosophy of directing the attention to the trenching operation itself and less to the support equipment. The weight and the propulsion force of the machine should be so low that hazard to the subsea line during burial is negligible...

... with an integrated subsea and topside control system? Prior to the more general acceptance that a multiplexed electrohydraulic control system is the way to operate subsea completions, it was not possible to integrate the two 2. DEVELOPMENT OF THE PLATFORM PROCESS CONTROL SYSTEM The development of platform-based...

... The Alwyn North Development in Block 3/9a of the United Kingdom Continental Shelf came on stream in November 1987 The field, owned by Elf UK plc (2/3) and Total Oil Marine plc (1/3), is operated by Total Oil Marine plc. The initial development plan called for two subsea satellite wells, formed...

... Christmas tree is assured by remotely operated subsea electrical and hydraulic connectors. Following exhaustive dry tests, a control system prototype was installed in the Agip Luna Field (Ionian Sea, Mediterranean) for long-term sea trials The project demonstrated that an autonomous control system...

... between 350 m and 750 m, culminating in a comprehensive programme of system testing Phase 2: Prototype application of the developed technology in diver-accessible depths to gain operating experience and demonstrate BP's capability. Phase 1 is due for completion in 1989, and within BP a possible...