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|
1. Romero, J. and Touboul, E.: "Temperature Predictions for DeepwaterWells: A Field Validated Methodology ," paper SPE 49056 prepared forpresentation at the 1998 SPE Annual Technical Conference and Exhibition, NewOrleans, 27-30 September.
2. Lloyd, W.L., Andrea, M.D., and Kozicz, J.R.: "New Considerations forHandling Gas in a Deepwater Riser," paper IADC/SPE 59183 presented at the 2000IADC/SPE Drilling Conference, New Orleans, 23-25 February.
3. Nes, A. et al.: "Gas in a Deep Water Riser and Associated Surface EffectsStudied with an Advanced Kick Simulator," paper presented at the 1998 IADCIntl. Deep Water Well Contract Conference, Houston, 26-27 August.
4. Shaugnessy, J.M.: "Test of Effect of Gas in a Deepwater Riser," InternalReport, Amoco Production Co. (1986).
5. Gonzales, R. and Shaugnessy, J.: "Industry Leaders Shed Light on DrillingRiser Gas Effects," Oil & Gas J. (17 July 2000) 98, No. 29,42-46.
6. Erb, P.R. and Ma, T.: "RiserCollapse a Unique Problem in Deepwater Drilling," paper IADC/SPE 11394presented at the 1983 IADC/SPE Drilling Conference, New Orleans, 20-23February.
7. Vefring, E.H. et al.: "Prediction of Downhole Pressures and Temperaturesin HPHT Well," paper presented at the 1993 Offshore Mediterranean Conferenceand Exhibition, Ravenna, Italy, 11-13 March.
8. Bjørkevoll, K.S. et al.: "Changes in Active Volume Due to Variations inPressure and Temperature in HPHT Wells," paper presented at the 1994 7thNorthern European Drilling Conference, Kristiansand, Norway, 4-6 October.
9. Vefring, E.H. et al.: "Simulator Accurately Predicts Conditions in HPHTWells," Oil & Gas J. (10 October 1994) 92, 41, 77-80.
10. Anfinsen, B.-T. and Bjørkevoll, K.S.: "Predicting Mud ECD in HPHTWells," paper presented at the 1995 IBC Technical Services 9th Annual OffshoreDrilling Technology Conference, Aberdeen, 22-23 November.
11. Rommetveit, R., Bjørkevoll, K.S., and Merlo, A.: "Temperature and Pressure Effects onDrilling Fluid Rheology and ECD in Very Deep Wells," paper SPE/IADC 39282presented at the 1997 SPE/IADC Middle East Drilling Technology Conference,Bahrain, 23-25 November.
12. Ekrann, S. and Rommetveit, R.: "A Simulator for Gas Kicks inOil-Based Drilling Muds," paper SPE 14182 presented at the 1985 SPE AnnualTechnical Conference and Exhibition, Las Vegas, Nevada, 22-25 September.
13. Petersen, J., Rommetveit, R., and Tarr, B.A.: "Kick with Lost Circulation Simulator:A Tool for Design of Complex Well Control Situations," paper SPE 49956presented at the 1998 SPE Asia Pacific Oil & Gas Conference and Exhibition,Perth, Australia, 12-14 October.
14. Haciislamoglu, M. and Langlinais, J: "Non-Newtonian Flow in EccentricAnnuli," J. of Energy Resources Technology (September 1990) 112,163-169.