Tension-Based Tension Leg Platform: Technologies for Ultra Deepwater Applications

2010 ◽  
Author(s):  
Nagan Srinivasan
Keyword(s):  
Water Depth ◽  
Oil And Gas ◽  
Cost Effective ◽  
Gas Production ◽  
Harsh Environment ◽  
Tension Leg Platform ◽  
Oil And Gas Production ◽  
Sea Bed ◽  
Horizontal Wave ◽  
Vibration Problems

This paper is about technology of the Tension Leg Platform (TLP) for use in ultra deepwater to support dry-tree in oil and gas production. New TLP concept for ultra deepwater development is introduced in this paper. A technically feasible and cost-effective artificial sea-bed is used to ease the tendon design practical at such deep water in harsh environment. The truss-pontoon is utilized to reduce the vertical and horizontal wave loadings. A simple and slim hull easy to design, fabricate, transport and install is obtained. Installation method is illustrated. Optional riser-support tower is proposed to make production risers feasible in 8000 ft of water depth with no riser pre-tension to the hull and with no vortex induced vibration problems. The paper enhances the TLP capability in deepwater.

Development of a New Methodology for Riser Deformed Shape Prediction/Monitoring

2018 ◽  
Author(s):  
Junho Choi ◽  
Joseph Moo-Hyun Kim
Keyword(s):  
Oil And Gas ◽  
Cost Effective ◽  
Evaluation Methods ◽  
Gas Production ◽  
Life Extension ◽  
Monitoring Method ◽  
Oil And Gas Production ◽  
Shape Prediction ◽  
Structural Evaluation ◽  
Service Life Extension

Ocean environmental conditions, such as waves, winds, and currents, are getting harsher due to climate change. This means that oil and gas production platforms in the ocean may experience unexpectedly large environmental loads bigger than previous design loads. Also, many platforms are reaching the end of their design lives. Ensuring riser integrity is one of the most important issues for platform safety and service-life extension. Currently, monitoring sensors are deployed on risers, and structural evaluation methods are utilized to examine riser integrity. However, there are some limitations to the structural evaluation methods. Furthermore, platform operators continue to seek for more direct and cost-effective riser monitoring method due to the low price of oil. In this study, the MultiSensor Fusion (MSF) system is proposed to surmount technical and economic obstacles in real-time riser-monitoring technology. The MSF system is validated for TLP (tension-leg platform) risers by using numerical sensors and numerical-simulation tools.

Riser Robotic Inspection - Reducing Safety Risk While Improving Efficiency and Effectiveness

2021 ◽  
Author(s):  
Nere’ Joseph Mabile ◽  
Alessandro Vagata
Keyword(s):  
Oil And Gas ◽  
Production Systems ◽  
Cost Effective ◽  
Visual Assessment ◽  
Gas Production ◽  
Assessment Process ◽  
Splash Zone ◽  
Oil And Gas Production ◽  
Technical Features ◽  
Inspection Data

Abstract Integrity management is an ongoing lifecycle process for ensuring safe operation and fitness for service of offshore oil and gas production systems, including risers. Risers offer a means of transporting fluids between subsea wells and the host platform crossing the splash zone that is probably the most critical region for corrosion and exposure to external damages. Furthermore, with their proximity to the personnel on the platform and to the topside equipment, risers are considered safety critical, and are therefore, subject to planned inspections followed by an engineering assessment of the findings. This paper discusses the motivation and business driver for developing and implementing a new and cost effective risers’ inspection methodology in the splash zone based on innovative robotic platforms. The technical features and the capabilities of the robot are outlined. Traditionally, risers’ inspections are carried out by rope access technicians and divers or ROV below the water line using conventional technologies as spot ultrasonic thickness measurements, traditional radiography and visual assessment. This type of inspection is based on a first visual assessment followed by NDE testing only if some finding is spotted. Internal defects or defect under coating, e.g. splashtron, can be easily overlooked, compromising the entire assessment process. Additionally such activities are often limited by accessibility, weather, and Personnel On-Board (POB) accommodations, but primarily they involve risks to inspector's safety. Backbone of the presented methodology is the use of a robotic crawler that has the key advantage to inspect autonomously the risers, navigating over obstacles like clamps and supports. The robot can carry a variety of payloads for visual inspections, surface profiling, and NDE examinations with the ability to scan large surfaces with or without coating and detect internal and external defects. It can operate in the topside, splash zone and subsea sections of the riser. The inspection data are processed in real time for an immediate assessment of the integrity of the asset. Examples are presented and comparison is made between traditional inspection methodologies and robotic autonomous methodologies to demonstrate the improvement of inspection effectiveness and efficiency. The paper also discusses the potential areas of future development, which include Artificial Intelligence (AI) algorithms to further automatize the process and methodologies of risers’ inspection and data analysis.

Water treatment technology for produced water

2010 ◽  
Vol 62 (10) ◽  
pp. 2372-2380 ◽  
Author(s):  
Angéla Szép ◽  
Robert Kohlheb
Keyword(s):  
Membrane Filtration ◽  
Oil And Gas ◽  
Produced Water ◽  
Mobile Station ◽  
Cost Effective ◽  
Gas Production ◽  
Treatment Technology ◽  
Oil And Gas Production ◽  
Produced Waters ◽  
Physical And Chemical

Large amounts of produced water are generated during oil and gas production. Produced water, as it is known in the oil industry, is briny fluid trapped in the rock of oil reservoirs. The objective of this study was to test produced waters from a Montana USA oilfield using a mobile station to design a plant to cost efficiently treat the produced water for agricultural irrigation. We used combined physical and chemical treatment of produced water in order to comply with reuse and discharge limits. This mobile station consists of three stages: pretreatments, membrane filtration and post treatment. Two spiral-wound membrane units were employed and the rejections of various constituents were examined. The performance of two membranes, 20 kDa weight cut-off (MWCO) ultrafiltration and a polyamide-composite reverse osmosis membrane was investigated. The mobile station effectively decreased conductivity by 98%, COD by 100% and the SAR by 2.15 mgeqv0.5 in the produced water tested in this study. Cost analysis showed that the treatment cost of produced water is less expensive than to dispose of it by injection and this treated water may be of great value in water-poor regions. We can conclude that the mobile station provided a viable and cost-effective result to beneficial use of produced water.

Application of Flexible Risers in Shallow Water: Weight Added Wave Configuration

2009 ◽  
Author(s):  
Zhimin Tan ◽  
Cobie Loper ◽  
Yucheng Hou ◽  
Terry Sheldrake
Keyword(s):  
Shallow Water ◽  
Oil And Gas ◽  
Real Life ◽  
Cost Effective ◽  
Gas Production ◽  
Flexible Riser ◽  
Flexible Pipe ◽  
Oil And Gas Development ◽  
Oil And Gas Production ◽  
And Performance

Unbonded flexible pipe has been a proven technology for riser solutions in offshore oil and gas production since the 1970s with over 2000 risers installed. The operating envelope for flexible riser configurations has continually expanded to meet the challenges of both shallow and deep water applications [1]. This paper presents recent innovations in technology for flexible riser solutions to enable oil and gas development in water depths as low as 20m with required system reliability as well as cost effectiveness. For shallow water applications, the traditional technology is the wave or S configuration. S configurations require a structure such as a mid-water buoyancy arch (MWA) to support the riser configuration, which increases the cost of both fabrication and installation. The wave configuration with distributed buoyancy is a more cost-effective approach in terms of installation. The disadvantage of this solution is that the riser could either float to the water surface or sink to the seabed when its content density varies or the floating production, storage and offloading vessel (FPSO) deviates from its nominal mooring position during field production. A new modified wave configuration, referred to as the Weight Added Wave (WAW) configuration (Patent pending) is presented, which enjoys the low installation cost of the wave configuration and performance reliability of the S riser configuration. The WAW configuration has been applied to two FPSO shallow water field developments and the results are presented herein to confirm the solution for real life applications.

scholarly journals Design and Performance Assessment of Multi-Use Offshore Tension Leg Platform Equipped with an Embedded Wave Energy Converter System

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3991
Author(s):  
Jianxing Yu ◽  
Zhenmian Li ◽  
Yang Yu ◽  
Shuai Hao ◽  
Yiqin Fu ◽  
...  
Keyword(s):  
Wave Energy ◽  
Oil And Gas ◽  
Time Integration ◽  
Gas Production ◽  
Wave Energy Converter ◽  
Wave Load ◽  
Energy Converter ◽  
Tension Leg Platform ◽  
Oil And Gas Production ◽  
Generating Capacity

In this study, a new multi-use offshore tension leg platform (TLP) was designed for wave energy production through an embedded wave energy converter (EWEC) system. The proposed EWEC system consists of four built-in tuned liquid column dampers for absorbing the hull motion energy and eight Wells turbines as the power take-off devices. A multifold nonlinear analytical model of this multibody system was developed considering the hydrodynamics of the TLP-EWEC system during large motions and the aerohydrodynamics of the chamber-turbine groups. A comprehensive assessment, including an evaluation of motion responses and preliminary generating capacity, was performed for different wave-load directions using the numerical time integration method. The results indicated that the multi-use platform can generate a considerable amount of turbine power for the offshore platform energy mix as well as serve for offshore oil and gas production in the target oil fields. Such additional benefits and profitability were proven effective and worthy for further exploration and practical application.

scholarly journals A Review of Methane Gas Detection Sensors: Recent Developments and Future Perspectives

Inventions ◽  
2020 ◽  
Vol 5 (3) ◽  
pp. 28 ◽  
Author(s):  
Tahani Aldhafeeri ◽  
Manh-Kien Tran ◽  
Reid Vrolyk ◽  
Michael Pope ◽  
Michael Fowler
Keyword(s):  
Optical Sensors ◽  
Oil And Gas ◽  
Electrochemical Sensors ◽  
Cost Effective ◽  
Primary Component ◽  
Gas Production ◽  
Future Research ◽  
Oil And Gas Production ◽  
Advantages And Disadvantages ◽  
Recent Developments

Methane, the primary component of natural gas, is a significant contributor to global warming and climate change. It is a harmful greenhouse gas with an impact 28 times greater than carbon dioxide over a 100-year period. Preventing methane leakage from transmission pipelines and other oil and gas production activities is a possible solution to reduce methane emissions. In order to detect and resolve methane leaks, reliable and cost-effective sensors need to be researched and developed. This paper provides a comprehensive review of different types of methane detection sensors, including optical sensors, calorimetric sensors, pyroelectric sensors, semiconducting oxide sensors, and electrochemical sensors. The discussed material includes the definitions, mechanisms and recent developments of these sensors. A comparison between different methods, highlighting the advantages and disadvantages of each, is also presented to help address future research needs.

scholarly journals COBRA Riser Concept for Ultra Deepwater Condition

2013 ◽  
Author(s):  
Tomy Nurwanto ◽  
Daniel Karunakaran ◽  
Ricardo Franciss
Keyword(s):  
Water Depth ◽  
Oil And Gas ◽  
Sudden Change ◽  
Cost Effective ◽  
Mooring Lines ◽  
Strength Performance ◽  
Design Performance ◽  
Cluster Region ◽  
Sea Bed ◽  
Flexible Jumper

Offshore ultra deepwater field is being promising as the future of oil and gas reserves. However, the development of ultra deepwater field posed many challenges, in particular, on the selection of the riser concept. Long suspended length of riser will significantly increase the vessel payload. High external hydrostatic pressure on the riser will increase the probability of collapse failure. Large dynamic motions of the vessel and large vessel offset yields potential buckling issues at the touch-down-point (TDP). In addition, potential fatigue problems due to vessel motions and soil-riser interactions also present at TDP area. Large current speed in deepwater field might also lead to vortex induced vibration (VIV) which eventually will contribute to significant fatigue damage for particular riser sections. By looking into these challenges, it is very important to select the most appropriate riser concept for the ultra deepwater field. Catenary Offset Buoyant Riser Assembly (COBRA) as newly developed hybrid riser concept offers a solution to overcome the challenges in ultra deepwater field. In general, COBRA consists of a catenary riser section with a long-slender sub-surface buoyancy module on top which is tethered down to sea bed via two mooring lines. The catenary section from top of the sub-surface buoy is connected to the floater by a flexible jumper. This flexible jumper can effectively absorb the floater motions, which give significant improvements for both strength and fatigue performance on the overall system. As a hybrid riser concept, this concept offers cost effective solution by avoiding all the expensive bottom assemblies that normally needed for a hybrid riser concept. This paper focuses on COBRA riser concept specifically for Santos Basin Central Cluster region at 2200 m water depth. It is observed that there is common sudden change phenomenon on the current direction in Santos Basin area. The effect of bidirectional current is analyzed, and the comparison with unidirectional current is discussed thoroughly. The analyses are focused on the global strength design performance under extreme environmental load and global fatigue design performance of the riser due to wave induced and VIV induced. The results clearly indicate that COBRA riser concept has a robust design and it is feasible for 2200 m water depth, in particular for Santos Basin Cluster Region area. It is also shows that COBRA riser has sufficient strength performance even for extreme bidirectional current.

Production Facility Choices for Moderate Water Depths

2004 ◽  
Author(s):  
Beverley F. Ronalds
Keyword(s):  
Water Depth ◽  
Oil And Gas ◽  
Gas Production ◽  
Production Facility ◽  
Oil And Gas Production ◽  
The North ◽  
The North Sea ◽  
Key Drivers ◽  
Distinguishing Features ◽  
Water Depths

Trends are presented to assist in choosing the optimum oil and gas production system for moderate water depths (less than 500m). Databases of fixed, floating and subsea facilities employed in the North Sea are utilised to outline the distinguishing features between these systems and to demonstrate the key drivers for their selection in different circumstances. These drivers include water depth, well count, oil and gas production rates and tieback lengths.

Buckling Criteria for Subsea Pipeline

2015 ◽  
Vol 74 (5) ◽  
Author(s):  
Abdul Khair, J. ◽  
Jaswar, Koto ◽  
Affis Effendi ◽  
Ahmad Fitriadhy
Keyword(s):  
High Pressure ◽  
Oil And Gas ◽  
Gas Production ◽  
Harsh Environment ◽  
Pipeline Transportation ◽  
Oil And Gas Production ◽  
High Pressure And Temperature ◽  
Subsea Pipeline ◽  
Life Period ◽  
Design Result

Oil and gas production in subsea operation continues to the extreme depth. Harsh environment and severe operation of oil and gas transportation due to high pressure and temperature become crucial for pipeline transportation. Consequently, The pipelines will deform to buckle shape which affect to integrity of pipeline. This phenomenon should be considered in design of pipeline to provide reliability of pipeline operation during time life period. The design result of pipelines is according to DNV F 101 whereas the magnitude of pipeline curvature will validate by ANSYS 14 to ensure pipeline reliability.  

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