Demonstration and Qualification Of A Riserless Dual Gradient System

Stave, Roger; Farestveit, R.; Høyland, S.; Rochmann, P.O.; Rolland, Nils Lennart

doi:10.4043/17665-ms

Cited by 17 publications

(7 citation statements)

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“…One possibility is to use a dual-gradient technique (Stave, 2005). It may be convenient to reproduce this effect on the drilling process to obtain a better match between the mud weight and the geo-pressure window.…”

Section: Dual Gradient Methodsmentioning

confidence: 99%

Advanced Drilling Simulation Environment for Testing New Drilling Automation Techniques

et al. 2012

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Newly developed drilling automation systems locate a computer interface between commands issued by the driller and instructions transmitted to the drilling machinery. Such functions are capable of faster and more precise control than achieved by an unaided operator and thus can help drilling within narrow margins. To ensure that these systems work properly in all circumstances, an advanced drilling simulator has been developed to enable testing under a wide range of simulated conditions.The environment described in this paper uses hardware in the loop simulation to verify that the automation techniques being tested respond correctly in real-time. Rigorously validated physical models of the drilling process simulate the response of the well to the commands given to the drilling machines. Abnormal drilling conditions (pack-offs, kicks, etc.), and equipment or machine related problems (plugged nozzles, power shortage, etc.) are convincingly recreated.The drilling simulator models the behavior of surface equipment like the activation of gate valves to line up different pits or the flow in the mud return. It simulates changes in the drilling fluid properties when mixing additives to the mud. It is therefore possible to focus training sessions on cooperation between different groups at the wellsite. This is particularly useful when planning the introduction of drilling automation that involves new work procedures as a result of automation and adaptation of the drilling team to a new operational environment.Drilling operations are becoming more and more complex. Automation has the potential to provide large improvements in efficiency and safety, but automation technologies must be implemented correctly at the workplace. In the same way as the aviation industry has utilized simulated environments for decades, drilling simulation environments are the key to the safe and successful implementation of drilling automation and the development of crew skills to face future challenges.

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Section: Dual Gradient Methodsmentioning

confidence: 99%

Advanced Drilling Simulation Environment for Testing New Drilling Automation Techniques

et al. 2012

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“…Lately, several vendors have marketed solutions to measure these properties automatically on a more continuous basis (Saasen et al 2009). To get a consistent and reliable evaluation of the mud properties, each of the pits containing drilling fluids that are used in the drilling operation should be instrumented with continuous fluid-property measurements.…”

Section: Status Of the Underreamer Arms (Point D) And Openholementioning

confidence: 99%

Toward Drilling Automation: On the Necessity of Using Sensors That Relate to Physical Models

Cayeux

Daireaux

Dvergsnes

et al. 2014

SPE Drilling &Amp; Completion

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Current topside and downhole instrumentation at the wellsite has been developed to manually conduct drilling operations. The emergence of automatic drilling-analysis software shows the limitations of today's measurement capabilities. It is therefore time to analyze the requirements for on-site instrumentation to implement new, efficient drilling-automation technologies.On one hand, drilling is facing more and more difficult conditions with narrow geopressure windows, deepwater, or high-pressure/high-temperature (HP/HT) conditions. On the other hand, unconventional hydrocarbon reserves may require a considerable amount of wells to be profitable. Drilling automation, by means of smart safeguards, automatic safety triggers, managed-pressure drilling (MPD), and ultimately complete or semiautonomous drilling rigs, can provide the solution to safely construct wells in these challenging settings.The common denominator for the vast majority of drilling-automation solutions is the use of physical models of the drilling process in the form of heat-transfer, mechanical, and hydraulic models. By analyzing the requirements of those models for necessary boundary conditions, it is possible to derive which measurements should be made both at surface and downhole to obtain stable and accurate calculations. This analysis also provides a way to estimate the necessary accuracy of the boundary conditions to ensure reaching the target control tolerance.By use of the boundary-condition analysis, it is possible to derive precisely which measurements should be performed and where they should be performed. As a result, a typical organization of sensors that is compatible with the implementation of drilling-automation solutions is derived.

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“…The riserless mud recovery system [2] is a very simple form of dual gradient drilling system [1]. A schematic of the system is Figure 1, together with photographs of the different components in figures 2, 3 and 4.…”

Section: Description Of Systemmentioning

confidence: 99%

“…A riserless mud recovery system developed by AGR Subsea AS of Bergen, Norway [2] and actively used in the Caspian was identified as a possible candidate to achieve all the desired objectives. A riserless mud recovery system developed by AGR Subsea AS of Bergen, Norway [2] and actively used in the Caspian was identified as a possible candidate to achieve all the desired objectives.…”

Section: Introductionmentioning

confidence: 99%

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Deployment of a Riserless Mud-Recovery System Offshore Sakhalin Island

Thorogood¹,

Rolland²,

Brown³

et al. 2007

Proceedings of SPE/IADC Drilling Conference

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TX 75083-3836 U.S.A., fax 1.972.952.9435. Abstract:A riserless mud recovery system enables dual gradient subsea drilling operations to take place with the well open at the seabed. There are no pressure containment devices at the wellhead, but as with earlier systems developed for deep water drilling [1], mud and cuttings are returned to the rig by means of a subsea pumping system, fluid recovery hose and umbilical. The system was field tested as part of the Norwegian DEMO2000 project [2]. Subsequently, it has seen operational service in a multi-well drilling campaign in the Caspian Sea. This paper describes how the system was implemented in a remote area exploration drilling operation off Sakhalin Island. Following experience in 2004 and 2005 [3] a clear business case emerged with the underlying drivers of limited weather window, shallow gas and stringent discharge regulations. Accordingly a formal project was established and a number of critical risk reduction studies were carried out in relation to shallow gas and integrity of the return hose under high current conditions. Correct interfacing onboard the rig required careful choice of location, power supply, wellhead and remotely operated subsea vehicle. There changes were verified by means of a formal hazard and operability review. A significant part of the effort involved gaining certification of the equipment for use in the Russian Federation in parallel with the fabrication, acceptance testing, mobilisation, offshore installation and commissioning of the system. The paper concludes with a review of the operational experience from the 2006 drilling season along with the associated lessons learned and forward plan.

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Demonstration and Qualification Of A Riserless Dual Gradient System

Cited by 17 publications

References 0 publications

Advanced Drilling Simulation Environment for Testing New Drilling Automation Techniques

Advanced Drilling Simulation Environment for Testing New Drilling Automation Techniques

Toward Drilling Automation: On the Necessity of Using Sensors That Relate to Physical Models

Deployment of a Riserless Mud-Recovery System Offshore Sakhalin Island

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