Managed Pressure Drilling

Hagshenas, Arash; Paknejad, Amir; Rehm, Bill

doi:10.1016/c2010-0-66595-3

Cited by 19 publications

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Attenuating heave-induced pressure oscillations in offshore drilling by downhole flow control

Strecker

Aamo

2019

IFAC Journal of Systems and Control

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One of the challenges when applying managed pressure drilling (MPD) offshore on a floating rig is the wave-induced heaving motion of the rig. During drillstring extensions, the drillstring is rigidly attached to the rig and follows the rig's heaving motion. This induces pressure oscillations in the well that can violate pressure margins, in particular in rough conditions and when margins are tight. In order to enable drilling operations under such conditions, the pressure oscillations are to be attenuated by use of a controllable valve installed in the bottomhole assembly (BHA) at the bottom of the drillstring. The subject of this paper is the controller design for the valve flow based on measurements of the BHA movement and downhole pressure. Using a frequency-domain approach, the control law is designed to, in case of downwards BHA movement, reduce the valve flow to compensate the mud being displaced by the BHA and the flow due to mud clinging to the moving drillstring. Controlling the valve flow in such a manner creates large differential pressures over the valve that can potentially destabilize the BHA motion, which must be taken into consideration in the control design. Stability and performance of the closed-loop system are verified in simulations using a high-fidelity model of the drilling mud and elastic drillstring.

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Attenuating heave-induced pressure oscillations in offshore drilling by downhole flow control

Strecker

Aamo

2019

IFAC Journal of Systems and Control

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Determination of operational flow regime and heat transfer performance optimization of mono and hybrid nanofluids using FOM and sensitivity analysis

Subramanian,

Roshan,

Chatterjee

et al. 2024

Journal of Molecular Liquids

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Automatic control of managed pressure drilling

Breyholtz

Nygaard

Nikolaou

2010

Proceedings of the 2010 American Control Conference

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Managed pressure drilling (MPD) has emerged as a powerful technology for safe and efficient drilling of hydrocarbon wells. However, it poses interesting control challenges that must be addressed before the anticipated impact. These challenges stem from the strongly multivariable nature of the problem, the presence of critical constraints, and the inherent uncertainty in both models and measurements. In this work we give a brief overview of managed pressure drilling, and make the case that model predictive control is a natural approach to controlling MPD. We demonstrate the proposed approach on an example of model predictive control application to dual-gradient drilling, a particular variant of MPD.Øyvind Breyholtz and Gerhard Nygaard are with the International

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Managed Pressure Drilling

Cited by 19 publications

References 0 publications

Attenuating heave-induced pressure oscillations in offshore drilling by downhole flow control

Attenuating heave-induced pressure oscillations in offshore drilling by downhole flow control

Determination of operational flow regime and heat transfer performance optimization of mono and hybrid nanofluids using FOM and sensitivity analysis

Automatic control of managed pressure drilling

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