Ultra-Deepwater Hydraulics and Well Control Tests with Extensive Instrumentation: Field Tests and Data Analysis
- Rolv Rommetveit (SINTEF Petroleum Research) | Knut S. Bjorkevoll (SINTEF Petroleum Research) | Jan Einar Gravdal (RF-Rogaland Research) | Clemente J.C. Goncalves (Petrobras S.A.) | Antonio Carlos V.M. Lage (Petrobras) | Jose E.A. Campos (Petrobras) | Atila F.L. Aragao (Petrobras S.A.) | Alberto Arcelloni (ENI AGIP SpA) | Shiniti Ohara (Shell Brazil E&P)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- December 2005
- Document Type
- Journal Paper
- 251 - 257
- 2005. Society of Petroleum Engineers
- 1.10 Drilling Equipment, 4.3.1 Hydrates, 6.1.5 Human Resources, Competence and Training, 5.1.1 Exploration, Development, Structural Geology, 7.2.3 Decision-making Processes, 1.5 Drill Bits, 1.6.1 Drilling Operation Management, 1.7.6 Wellbore Pressure Management, 1.12.6 Drilling Data Management and Standards, 4.2.4 Risers, 4.1.5 Processing Equipment, 2.1.7 Deepwater Completions Design, 1.7.5 Well Control, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 3 Production and Well Operations, 1.6 Drilling Operations, 1.11 Drilling Fluids and Materials, 2 Well Completion, 1.7 Pressure Management, 4.1.2 Separation and Treating, 4.5.10 Remotely Operated Vehicles
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Detailed measurements of downhole pressures and temperatures have beenperformed during simulated drilling operations at ultradeepwater offshoreBrazil. Sensors were placed at six different positions along the drillstring,which made high-frequency recordings of pressure and temperature during
• Surges and swabs at different depths.
• Gel-breaking tests.
• Circulation sweeps.
• Migration of gas in the riser.
It was expected that the special conditions in ultradeep wells with lowtemperature along most of the very long riser would cause some significantdeviations from corresponding measurements in more-normal wells. Themeasurements aimed at identifying, understanding, and quantifying such effects.This is considered very important because a narrow window between pore andfracture pressure is common in very deep waters.
Advanced transient models were used to identify the most interestingeffects. Effects that are reliably reproduced by advanced transient models arealso important, but operators are able to do calculations to prepare forthem.
A remote-operated vehicle (ROV) recorded temperature outside the riserduring experiments to give input to a detailed study of heat transfer fromdrilling fluid inside the riser to the seawater outside.
The purpose of the tests was to obtain detailed measurements of physicaleffects that may be important in ultradeepwater wells.
This paper presents a detailed analysis of the recorded data, includingcomparing them to advanced computer models for transient pressure andtemperature during drilling, circulation, and surge/swab. In addition, the gasmigration is simulated with an advanced kick simulator.
Safe and economic drilling in ultradeepwater poses a number of technicalchallenges. Some assumptions made for moderately deep water depths (<1500m) cannot be extrapolated to ultradeepwater drilling conditions.
A joint-industry research program has focused on several challengesassociated with well control, hydraulics, and drilling-fluid performance insidethe riser and well in cold, ultradeepwater environments.
The program has addressed the following issues: ultradeep-riser hydraulicsand temperature, critical pressure effects for ultradeepwater drilling, and gasrise and migration in ultradeep risers.
In summary, the following benefits have been anticipated on the basis ofthis project:
• Improved drilling practices and economics on the basis of increasedunderstanding and knowledge of ultradeep drilling-fluid hydraulics andtemperatures in the riser.
• Increased control of downhole pressures and formation fractures on thebasis of drilling-fluid hydraulics in the riser section of ultradeepwater; thiswill reduce occurrence of costly problems downhole.
• Fewer well and formation problems result in unanticipated downholepressures that are a direct result of mud-gelling properties in theseawater-cooled riser.
• Safer prediction and handling of gas in ultradeep risers.
|File Size||1 MB||Number of Pages||7|
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