Integrating Emerging Drilling Methods From Floating Drilling Rigs-Enabling 
Drilling Solutions for the Future

Kozicz, John

doi:10.2523/99135-ms

Cited by 2 publications

(2 citation statements)

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“…One consists of injecting light weight additives (e.g. gas, glass beads) into the mud contained in the marine riser in order to reduce the apparent mud density above the sea level (Kozicz et al 2006). Alternatively, subsea pumping can be used to lift up the mud to the rig while keeping a static column of another fluid of different density, sometimes called the blanket fluid, above the suction point.…”

Section: Introductionmentioning

confidence: 99%

Principles and Sensitivity Analysis of Automatic Calibration of MPD Methods Based on Dual-Gradient Drilling Solutions

Cayeux

Daireaux

Dvergsnes

et al. 2014

Day 2 Thu, September 11, 2014

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Dual-gradient drilling (DGD) solutions have been developed to work with greater margins while drilling in deep water environments by mirroring hydrostatic pressure conditions that are closer to the natural ones. Recent attempts have been undertaken to use DGD to actively control the downhole pressure and therefore turning them into managed pressure drilling (MPD) solutions. The pressure control strategy requires the knowledge of how pressure will change along the borehole as a function of the drilling parameters and therefore needs to use numerical hydraulic models. However, the accuracy of the prediction of pressure calculations depends on a certain number of parameters that are not necessarily well known. Some of those significant factors are well defined but are not necessarily measured as extensively as it would have been required. Others are subject to the actual downhole conditions and may change with time. Therefore, they are, in many instances, difficult to assess with enough certainty. As a result, it is necessary to constantly calibrate the downhole pressure calculations in order to match observed values at controlled positions. This calibration process is usually done manually by a human operator, leaving the possibility for possible misinterpretations of the actual calibration data and consequently a potentially erroneous control of the downhole pressure by the MPD control algorithm.In this paper, we review the sources of uncertainties that can affect the accuracy of the downhole pressure calculations. Thereafter, we explain how automatic calibration of the numerical models can be made in order to match reference measurements. The proposed method also allows for an evaluation of the accuracy by which the downhole pressure calculations can be made. In conjunction with the required precision to control the downhole pressure during a drilling operation, it is possible to assess whether additional measurements or working procedures should be implemented prior to an MPD dual-gradient operation with tight constraints.

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Section: Introductionmentioning

confidence: 99%

Principles and Sensitivity Analysis of Automatic Calibration of MPD Methods Based on Dual-Gradient Drilling Solutions

Cayeux

Daireaux

Dvergsnes

et al. 2014

Day 2 Thu, September 11, 2014

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“…Several methods for Managed Pressure Drilling (MPD) have been suggested and some of these are already commercially available to the industry 4,5 . These methods allow a more precise control of the borehole pressure.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of MPD Methods for Compensation of Surge-and-Swab Pressures in Floating Drilling Operations

Rasmussen

Sangesland

2007

Proceedings of IADC/SPE Managed Pressure Drilling &Amp; Underbalanced Operations

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TX 75083-3836 U.S.A., fax 1.972.952.9435. AbstractOne of the main limitations in deep water drilling and drilling in depleted reservoirs is the low margin between the fracture and the pore pressure gradients. Drillstring tripping causes additional pressure variations in the borehole. The use of a Mobile Offshore Drilling Unit (MODU) in deep water results in even more severe surge and swab pressures, which are more difficult to control due to the MODU heave motion. Normally, no control of surge and swab pressure is possible during drillstring connections. This paper presents the magnitude of surge and swab pressures that can occur in typical drilling operations, but will focus on Through Tubing Rotary Drilling (TTRD) operations. Most of the current methods for Managed Pressure Drilling (MPD) from MODUs do not have a functionality to compensate for both surge and swab pressures. A comparison and evaluation of selected MPD methods for compensation of surge and swab pressure are presented in the paper.

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Integrating Emerging Drilling Methods From Floating Drilling Rigs-Enabling Drilling Solutions for the Future

Cited by 2 publications

References 0 publications

Principles and Sensitivity Analysis of Automatic Calibration of MPD Methods Based on Dual-Gradient Drilling Solutions

Principles and Sensitivity Analysis of Automatic Calibration of MPD Methods Based on Dual-Gradient Drilling Solutions

Evaluation of MPD Methods for Compensation of Surge-and-Swab Pressures in Floating Drilling Operations

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