This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 159132, "Geosteering the Impossible Well: A Success Story From the North Sea," by Soazig Leveque and Christophe Dupuis, Schlumberger; Thomas Stærmose, Estela Vazquez Esmerode, and Peter Sommer Linnet, DONG E&P; and Graham Raeper, Schlumberger, prepared for the 2012 SPE Annual Technical Conference and Exhibition, San Antonio, Texas, USA, 8-10 October. The paper has not been peer reviewed.
This article, written by Special Publications Editor Adam Wilson, contains highlights of paper IPTC 16523, "Oman's Large-Carbonate-Field Production Improvement Through Integrated Well, Reservoir, and Facility Management," by S.M. Al-Khadhuri, M.M. Al-Harthi, and A. Alkalbani, Petroleum Development Oman, prepared for the 2013 International Petroleum Technology Conference, Beijing, 26-28 March. The paper has not been peer reviewed.
New and Improved Proppants - No abstract available.
This paper focuses on modeling nonisothermal multiphase outflow of high-temperature producer wells in Shell's in-situ-upgrading process (IUP).Subsurface heating and in-situ upgrading of bitumen involves installing heaters into the subsurface and raising reservoir temperatures to higher than 325°C. Consequently, flow conditions at the wellhead and along the tubing for atypical IUP producer well exceed pressure and temperature ratings of conventional equipment, particularly during peak production periods. Thus, the ability to reasonably predict pressure and temperature along the wellbore over the entire production cycle is important for designing IUP production wells and associated production facilities. A nonisothermal multiphase computational model has been developed for predicting the performance of IUP producer wells.
Complex multiphase transport phenomena occur inside an IUP producer wellduring the production of high-temperature, upgraded hydrocarbon products. These include gas/oil/water three-phase flow; turbulent convective heat transfer between the tubing wall and the surrounding formation; pressure drop along thewellbore caused by gravity, friction, and acceleration; and phase changes caused by condensation and evaporation caused by variations in pressure and temperature along the well. These processes are strongly coupled, and accurate analysis demands a coupled modeling approach. Pressure and temperature variations result in changes in mass density and velocity, which have a significant influence on convective-heat-transfer rates. Mass-flow rates in the wellbore vary significantly with time because of production requirements during the life of a producer well (5 to 8 years). Long durations of high production rates can raise the temperature of the wellbore in the overburden and lower overall heat-loss rates. Sustained periods of low or no flow can cause the wellbore to cool and result in different flow and heat-transfer characteristics upon reopening of the well. Therefore, conductive time scales in the near-well formation are important to accurately predict flow tubing temperatures and pressures.
An advanced wellbore model is developed for coupling the multiphase flow, heat transfer, and phase change phenomena in a high-temperature, unconventional oil producer well. Vapor/liquid/liquid (VLL) three-phase flash calculations are used to describe phase condensation and evaporation caused by changes in temperature and pressure along the wellbore. The model is formulated by use of k-values that are consistent with the CMG STARS reservoir model (STARS 2007) used for thermal simulation of Shell's IUP process. The drift-flux model is used to describe gas/liquid two-phase flow, and multiple transient energyequations are used for the wellbore, casing strings, and surrounding formation.The overall pressure gradient in the two-phase flow is formulated as the sum of gravitational, friction, and acceleration components. All transport equations are implicitly coupled for stable efficient transient calculations.
The model is validated with published data and simplified analytical solutions for limiting flow conditions. Computational results are compared with data from an IUP producer well in the oil sands of Alberta, Canada. Reasonable temperature and pressure matches were obtained, demonstrating that the model can predict transient and axial profiles of pressure, temperature, phase volume fraction, phase mass density, and component composition in a high-temperature flowing producer well during the entire production cycle.
The development of compact topside processing plants for floating, production, storage and offloading (FPSO) vessels is a growing industry trend that can reduce operating and capital expenditures over the life of the vessel, a researcher and scientist said recently.
This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 165138, "Produced-Water-Reinjection Design and Uncertainty Assessment," by Jalel Ochi, Dominique Dexheimer, and Vincent Corpel, Total EP France, prepared for the 2013 SPE European Formation Damage Conference and Exhibition, Noordwijk, the Netherlands, 5-7 June. The paper has not been peer reviewed.
The sedimentation and self-weight consolidation of dredged soil is influenced by segregating sedimentation. Various problems occur depending on the sedimentation characteristics, which are difficult to predict. Accordingly, the authors calculated the volume and density ratios for a fine-grained soil layer in dredged soil after the completion of sedimentation and self weight consolidation. Then, they calculated the resulting settlement. This method was found to be effective for evaluating the settlement caused by sedimentation and self-weight consolidation.
This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 163428, "Torsional Resonance: An Understanding Based on Field and Laboratory Tests With Latest-Generation Point-the-Bit Rotary Steerable Systems," L.A. Lines, SPE, D.R.H. Stroud, SPE, and V.A. Coveney, Weatherford, prepared for the 2013 SPE/IADC Drilling Conference and Exhibition, Amsterdam, 5-7 March. The paper has not been peer reviewed.
Technology Focus - No abstract available.
Q&A - No abstract available.