Offshore drilling system comprising a drilling tower (10), a tubular string hoisting device with a crown block (23) and a travelling block (24) suspended from said crown block in a multiple fall arrangement, a heave compensation system adapted to provide heave compensation of the travelling block (24). The heave compensation system comprises a hydraulic sheave compensator (32, 33). The system further comprises a mobile working deck (70) which is movable with respect to the drilling tower (10) within a motion range including a heave compensation motion range (72). The heave compensation system is further adapted to provide heave compensation of the mobile working deck (70) by a hydraulic deck compensator (60), which is hydraulically connected via a hydraulic conduit (65,66) to the hydraulic sheave compensator (32, 33), such that in operation the deck compensator (60) moves synchronously with the sheave compensator (32, 33) of the heave compensation system.

Offshore drilling system, vessel and method

The invention discloses a direct hydraulic cylinder type offshore drilling riser tensioning system. A tensioner fixing frame is fixed on the lower surface of a floating drilling platform; a riser system of an underwater wellhead device is fixedly provided with a tensioning ring, and the tensioner fixing frame is connected with the tensioning ring through a hydraulic cylinder assembly; an accumulator, a high pressure air source, a control device and a control support assembly are arranged on a deck of the floating drilling platform; the accumulator is communicated with the hydraulic cylinder assembly through a recoil valve, and the high pressure air source is connected with the accumulator; and the recoil valve is connected with the control device. The control system is simple in structure, safe and reliable, and can provide approximately constant huge tension for an offshore drilling riser system in the floating drilling platform, thereby providing effective safety guarantee in drilling operation of the offshore floating drilling platform.

Direct hydraulic cylinder type offshore drilling riser tensioning system

Device (11) for compensation of wave induced distance variations to a drill string between a floating drill rig and a seabed-fixed installation, comprising an extendable cylinder/piston unit (12) which is arranged to be able to compensate when the load exceeds a pre-determined threshold value. The cylinder (13) of the cylinder/piston unit (12) comprises a non-compressible liquid at both sides of a piston (14) positioned substantially in the middle of the cylinder (13) and is prevented from fluid communication with the surroundings. A control valve (19) is arranged to activate the device (11) by opening for fluid communication between the cylinder (13) and a gas containing accumulator (17) when the load exceeds a predetermined threshold value. The device is characterized by being a complete, self-supported unit comprising cylinder (13), piston (14) on a piston rod (15), accumulator (17), control valve (19) and drainage tank (20).

Device for compensation of wave influenced distance variations on a drill string

The invention relates to a near-sea separation and tie-back device for typhoon-resisting drilling risers The near-sea separation and tie-back device for the typhoon-resisting drilling risers is characterized by comprising an upper separator and a lower separator, and the upper separator and the lower separator are matched through a positioning conical surface The outer side of the lower separator is provided with a guide rope holeevery 180 degrees along the circumferential direction The outer side of the upper separator is provided with a circle of protruded blocks along the circumferential direction The upper separator is provided with a radial through hole every 60 degrees along the circumferential direction, the through holes are matched with clamping blocks, and the clamping blocks are driven by a hydraulic driving device The hydraulic driving device is divided into two parts which are connected by bolts, circumferential grooves are formed in the inner side of the hydraulic driving device, the circumferential grooves are matched with the protruded blocks on the outer side of the upper separator, and therefore the hydraulic driving device can be connected with the upper separator The outer side of the hydraulic driving device is provided with a guide rope hole every 180 degrees along the circumferential direction, the lower portion of the hydraulic driving device is provided with a hydraulic cylinder every 60 degrees along the circumferential direction, and each hydraulic cylinder is provided with two hydraulic control pipelines The near-sea separation and tie-back device for the typhoon-resisting drilling risers is simple in structure, convenient to operate, strong in bearing capacity, high in operation efficiency and capable of being widely used in connection of the various at-sea typhoon-resisting drilling risers

Near-sea separation and tie-back device for typhoon-resisting drilling risers

A riser data logging system can be installed on the riser top to provide real time information of the riser, instead of or in addition to relying on sensors installed on a tensioner. The riser recoil detection system can thus be made independent of any motion of the vessel. This logging system can feedback the riser top acceleration, velocity, position, and the wire-line tensions into a controller. By comparing the acceleration difference between the riser top and the vessel body, the controller can provide more reliable and faster detection of events occurring on a vessel, potentially detecting the condition within one second. If the acceleration exceeds a certain limit, the electrical tensioners are able to reduce the wire-line tension nearly instantaneously, providing a much more effective anti-recoil control that conventional hydro- pneumatic tensioners.

Anti-recoil control design using a hybrid riser tensioning system in deepwater drilling

The invention discloses a marine drilling riser tensioning system which comprises a plurality of tensioner assemblies respectively arranged around a floating type drilling platform, wherein each tensioner assembly comprises a tensioning cylinder and an energy storage device, wherein the upper end and the lower end of the tensioning cylinder are respectively provided with an upper tackle block and a lower tackle block, the distance between the upper tackle block and the lower tackle block is changed with the flexibility of a piston; a lower cavity of the energy storage device is filled with a high-pressure liquid, an upper cavity of the energy storage device is filled with a high-pressure gas, the lower cavity of the energy storage device is communicated with a piston cavity of the tensioning cylinder, the upper cavity of the energy storage device is communicated with a high-pressure air system; and a steel rope sequentially bypasses through the upper tackle block and the lower tackle block and is connected with a connection device after guided by a guide pulley, and the connection device is connected with a tensioning ring hung on a riser system. The marine drilling riser tensioning system has the advantages of simple structure, convenience for control, reliability in control, low manufacture cost and large bearing capacity.

Marine drilling riser tensioning system

The utility model discloses a steel wire rope type riser tensioner device. Movable pulley frames and movable pulley blocks are arranged at the upper ends of piston rods of a hydraulic cylinder assembly; fixed pulley frames and fixed pulley blocks are arranged at the lower end of the hydraulic cylinder assembly; the hydraulic cylinder assembly is communicated with a piston type energy accumulator through a recoil valve; the piston type energy accumulator is communicated with a high-pressure valve group assembly; a plurality of fixed pulley frames are fixedly arranged on an installation seat of a floating drilling platform; and each steel wire rope is led out of a fixed end of one of the fixed pulley frames, and the other end of the steel wire rope sequentially passes through one of the movable pulley blocks, one of the fixed pulley blocks and a guide pulley block assembly on a lower surface of the floating drilling platform and then is fixedly connected with a tensioning ring. By the steel wire rope type riser tensioner device, hydraulic power is provided for an offshore drilling riser tension system, the rigidity of the riser system is improved, and damage to the offshore drilling riser system during lifting and descending movement of a platform/ship is prevented.

Steel wire rope type riser tensioner device

The utility model discloses a rope coiling drive device applied to a steel-wire-rope-type marine riser tensioner. A sliding wheel shaft is horizontally arranged on a lower fixing frame of a steel-wire-rope-type marine riser tensioner. A rope coiling hub is sleeved on the sliding wheel shaft. The rope coiling hub is fixedly connected with a large gear of a drive gear pair. A drive shaft is horizontally arranged on a side support plate of the lower fixing frame. A small gear of the drive gear pair is arranged on one end of the drive shaft in coaxial mode. The small gear is meshed with the large gear of the drive gear pair. A braking device is sleeved on the drive shaft in coaxial mode. The other end of the drive shaft is connected with a motor through a coupling in coaxial mode. The motor is connected with a control panel in controlling model. A locking pin is arranged between the side support plate of the lower fixing frame and a through hole in the rope coiling hub. The rope coiling drive device solves the problems that a steel wire rope of the steel-wire-rope-type marine riser tensioner is difficult to wind, replace and maintain on a sliding wheel set.

Rope coiling drive device applied to steel-wire-rope-type marine riser tensioner

The invention discloses a rope-winding driver for wire rope type marine riser tensioners, which comprises a lower holder, a pulley shaft is arranged on the lower holder, and a rope-winding hub is mounted on the pulley shaft, and is fixedly connected with a big gear of a drive gear pair; a drive shaft is mounted on the lower holder, a small gear in the drive gear pair is coaxially mounted on one end of the drive shaft, and is engaged with the big gear in the drive gear pair, a brake is coaxially mounted on the drive shaft, and a motor is transmissively connected with the other end of the drive shaft through a coupling, and is controlled by and connected with a control panel. The rope-winding driver solves the problem that a wire rope in a wire rope type marine riser tensioner is difficult to wind on a pulley block, replace and maintain.

Rope-winding driver for wire rope type marine riser tensioners

Popular Tasks used by Researchers

How can I help with your research?

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

We encountered an error while loading the panel. Please try refreshing the page.

Something went wrong

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

Anyone with the link can view this chat. You can switch it back to private anytime.

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Gangfeng Ren

Author Tools

Chat about Author

Papers

Marine drilling riser tensioning system

Steel wire rope type riser tensioner device

Rope coiling drive device applied to steel-wire-rope-type marine riser tensioner

Rope-winding driver for wire rope type marine riser tensioners