... 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 full potential. autonomous subsea well control systems...

... production systems. A recent Government report has documented evidence which supports the longstanding concern of operators, contractors and regulators over their reliability. Among recommendations made in that report was the need for improvements in overload protection to prevent expensive damage caused...

...IMPACTS OF WEATHER AND CLIMATE ON THE OFFSHORE INDUSTRY J.C. THOMSON Oceanroutes (UK) Ltd Swire House, Souter Head Road, Aberdeen AB1 4LF Scotland ABSTRACT The use and application of ~neteorological data in support of the offshore oil and gas can assist In all aspects of operations. From the use...

... for operating wellhead and downhole safety valves IS produced from a subsea unit, with communication signals for valve control and sensor monitoring uslng acoustic telemetry with seawater as the transfer medlum. 1.0 INTRODUCTION The aim of SPARCS is to reduce the cost of future subsea hydrocarbon production...

... 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...

...Advances in Riserless Intervention for Subsea Well Servicing Colin Headworth, Wharton Williams Comex Houlder Ltd, UK Pete Cowan, Otis Pressure Control Ltd, UK Downhole maintenance or logging on subsea wells in the North Sea has typically required the operator to give inhouse budget approval...

... 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 on a poorly laid out tree...

...-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...

..., the submersible support vessels (SSV). The latest developments in submarine components show 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...

... operation, and which has become increasingly removed from the original land-based concept. Over the past two decades the technology of subsea wells has been developed in two main directions They have become more numerous, invariably clustered on subsea templates of up to 2000 tons in weight. Pipeline...

...) 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 speed control. The variable- frequency power sources that supply...

... of pressurized fluid (2) The extremely long 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...

... repair tool main seal hydraulically operation lower ball unit seal ring valve upstream oil & gas valve housing bonnet actuator valve body pipeline pigging underwater technology subsea system hydraulic pressure ball unit bearing plate upper ball unit midstream oil & gas...

... control module cable operation module particle safe burial method burial depth water jet subsea line trench container offshore pipeline burial control container subsea system protection trencher module underwater technology capjet 500 CAPJET-A Simple and Safe Burial Method...

... sequenced actions as the role of a well slot is changed. But what has this to do 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...

... 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...

..., designs, techniques and equipment in water depths between 350 m and 750 m, culminating in a comprehensive programme of system testing Phase 2: Prototype application of the developed technology in diver-acces- sible depths to gain operating experience and demonstrate BP's capability. Phase 1 is due...