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Abstract High-temperature electric submersible pumps (ESPs) are the most commonly used artificial lift method in steam-assisted gravity drainage (SAGD) wells. While conceptually the SAGD process should provide a low-viscosity single-phase flow to the ESP system, changing pressures and temperatures associated with well drawdown create opportunities for introduction of free gas, water vapor, or both, resulting in multiphase flow regimes. This can often lead to wellbore flow instability and ESP performance deterioration. An innovative approach to understanding ESP performance in multiphase flow conditions in SAGD production wells was developed by Shang, S. and Gomez-Bustamante, N. (2017), using well-specific fluid PVT characteristics to create the produced mixture's phase envelope. This analytical approach is able to identify phase boundaries, determine gas-water vapor volume fraction (GWVF), and predict flow regimes as a function of surface and downhole flowing measurements. In this case study, the authors extend the modeling work done by Shang, S. and Gomez-Bustamante, N. (2017) with the objectives of constructing a wellbore model that includes the complex downhole completion, conducting transient analysis of the entire wellbore, analyzing slugging characteristics both upstream and downstream of the ESP, and ultimately providing operational recommendations to maximize well drawdown while maintaining wellbore stability.
- Reservoir Description and Dynamics > Improved and Enhanced Recovery > Thermal methods (1.00)
- Reservoir Description and Dynamics > Formation Evaluation & Management > Drillstem/well testing (1.00)
- Production and Well Operations > Well & Reservoir Surveillance and Monitoring > Production logging (1.00)
- (2 more...)
Development of Simplified Deep Sea Water Intake System - Plan, Design, Analysis And Experiment
Jung, Dong-ho (Maritime & Ocean Engineering Research Institute (MOERI), KORDI, Daejeon,Korea) | Kim, Hyeon-ju (Maritime & Ocean Engineering Research Institute (MOERI), KORDI, Daejeon,Korea) | Moon, Deok-soo (Maritime & Ocean Engineering Research Institute (MOERI), KORDI, Daejeon,Korea) | Lee, Seung-won (Maritime & Ocean Engineering Research Institute (MOERI), KORDI, Daejeon,Korea) | Chung, Hyeon (Ocean space Ltd., Korea) | Park, Han-il (Korea Maritime University, Busan, Korea)
ABSTRACT A simplified intake system for pumping deep sea water (DSW) far away from land is developed. Based on a development system for natural gases or oils, the structure in new concept for DSW intake consists of a riser pipe, an anchor, and a buoy. The riser connected with a polyethylene pipe stands vertically in the low tension due to the specific gravity of 0.95 of a Polyethylene without a mooring line. The bottom end of the riser is positioned far from the seabed in order to prevent the influx of particles on the seabed. With a hose inserted on hole of the riser pipe and a water pump on a ship the DSW located at deeper than a water depth of 200m is transferred to a tank on a ship. The structural safety of the riser pipe made from a P.E. material that has a low allowable strength must be checked with the numerical or experimental studies before it is actually installed at sea. From the results of the 3-D dynamic structural analysis it is concluded that the designed riser pipe under a severe ocean environment can perform its function without destruction. The actually experiment at sea was carried out to certify the pumping performance of the newly designed development system. From the results of the experiment, it is demonstrated that the DSW intake can be done with the development system suggested in this study in very simple and low cost. INTRODUCTION Two hundred meters under the sea where sunlight does not reach, deep sea water (DSW) maintains stable low temperature throughout the year. In the deep sea, there are almost no organic substances or agents of disease but there is infinite seawater supply with rich nutrients and minerals for the growth of ocean plant (Kim et al., 2005).
ABSTRACT Desalination is a growing option as a source of drinking water. Consistent and reliable feedwater is required to efficiently produce potable water. Existing intake scenarios are limited. Direct intake of surface seawater is hampered by impingement and entrainment of planktonic organisms that require additional filtration and pretreatment. Vertical beach wells are restricted by their infiltration rate, whereas radial collector wells have a greater infiltration rate, but are restricted by hydrogeological properties of the subsurface geology. Infiltration galleries provide sizeable infiltration rates, but are constrained to select geological provinces. A synthetic beach well designed to overcome the existing limitation is proposed. INTRODUCTION Seawater desalination is becoming an attractive source of drinking water in coastal states as the costs of desalting water declines. Globally, desalination capacity is projected to double in the next ten years according to market forecasts by Global Water Intelligence (London). California, development of coastal desalination is expected to add more than 1 million cubic meters per day of capacity, if all planned activities are executed according to the California Water Desalination Task Force. The three largest proposed projects California, all with stated capacity of 50 million gallons per day (189,250 m3/d), are co-located with coastal power plant and plan utilize the heated effluent from the power plant's once-thru-cooling system. Once-thru-cooling of coastal power plants has been criticized for the destruction of marine life by impingement and entrainment of larval stages of marine organisms. The trend within the electric power utility industry is away from once-thru-cooling to other solutions for cooling of the power plants such as closed-cycle cooing systems. A new approach is required to draw feedwater into desalination plants. This paper reviews the current state of the art in seawater intakes, examines the limitations of existing methods and proposes an engineering solution to the current limitations.
Abstract One of the major challenges in SAGD Electrical Submersible Pump (ESP) operation is produced water flashing to steam when flowing pressure loss is significant, such as at an ESP intake. "Bottom Feeder" style intakes are a standard SAGD ESP intake which has been applied in the SAGD industry for over a decade. However,it was identified in recent years at ConocoPhillips's (CPC) Surmont Oilsands operations that Bottom Feeder intakes can lead to steam flashing in pump at the right conditions. The flashed steam causes significant cavitation in pump, which in turn causes severe motor load chattering. Further to that, steam locking in the pump can occur, which is called a "no flow event" (NFE) in the SAGD industry. ConocoPhillips and Baker Hughes have been working together to optimize SAGD ESPs by utilizing an integral intake to minimize the pressure loss across the intake ports. This would also streamline the connection between intake and pump housing to minimize pressure loss at these intake flow paths. The improved design has been tested in Surmont successfully, and the integral intake has become an optional intake to be applied in the well cases where steam flashing has been known to cause operation interruptions or ESP damages. This paper will review the process undertaken by CPC and Baker Hughes to study the ESP performance with the bottom feeder intake in comparison to the ESP performance with an integral intake.Design and field data will be presented and reviewed to highlight the performance of each system.
- North America > Canada (0.31)
- North America > United States (0.29)
Global Dynamic-Positioning Of A Floating Otec Plant Using Warm Surface Seawater Intake
Ertekin, R.C. (University of Hawaii) | Qian, Z.M. (University of Hawaii) | Nihouse, G.C. (Pacific Int. Center for High Tech. Research) | Vega, L.A. (Pacific Int. Center for High Tech. Research) | Yang, C. (George Washington University)
ABSTRACT The global dynamic positioning of a floating OTEC plant with an attached cold water pipe is considered, using the momentum flux associated with the warm surface seawater intake. The present work exploits the idea that, under normal OTEC operating conditions, a floating body could be kept in a global position, within a given radius, without the need for mooring lines or thrusters if the momentum flux from the surface seawater intake or the effluent discharge is adequately distributed around the hull. This problem is studied In the presence of steady external forces that act on the platform-pipe system in regular seas, and a positioning model is developed. The model is then applied to a sample OTEC plant to determine the technical feasibility of the solution in particular cases. The proposed positioning model can be used to determine the distribution and amount of momentum flux necessary to keep the plant in position. INTRODUCTION In an OTEC process, warm seawater is fed to the plant from the surface of the ocean, while cold seawater is pumped from the deep ocean by means of a long cold-water pipe (CWP). The mixed effluent discharge pipes can be moderate in length, extending to a depth sufficient not to interfere with the warm-water intake. When warm seawater flows through lateral openings slightly above the keel of the platform, momentum is generated. The rate of this momentum can be used to balance, either partially or totally, the external forces exerted on the platform and attached pipes, to achieve positioning without the need for additional power for thrusters. Nihous and Vega (1991) presented the designs of several floating OTEC plants that show possible locations of the warm-water intake pipes, as" well as the mixed effluent discharge pipes.