Dynamic and Static Thermal Well Flow Control Simulation

Stone, Terry; Naccache, P.F.; Neylon, K.; Edwards, David A.; Perez-Damas, Carlos Emilio; Rowan, David; Raffn, Anne Gerd

doi:10.2118/130499-ms

Cited by 5 publications

(1 citation statement)

References 12 publications

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“…Other recent work examining SAGD operations with wells incorporating inflow-control devices (ICDs) and flow-control valves under feedback control, looped multisegmented-well (MSW) topology, and pressure/rate control at several points internal to the wellbore was discussed by Stone et al (2010aStone et al ( , 2010b.…”

Section: Reviewmentioning

confidence: 99%

Practical Control of SAGD Wells With Dual-Tubing Strings

Stone

Brown

Güyagüler

et al. 2014

Journal of Canadian Petroleum Technology

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Claims include (i) providing a pair of horizontal wells, separated by a distance of approximately 3 to 8 m, each with a liner and an additional tubing string extending through the full length of the liner, (ii) conductive heating of the interwell region by circulating steam in both wells for an initial period of time, (iii) subsequent injection of steam in the upper well through both the long tubing string and at the heel of the annulus at a constant pressure that is less than fracture pressure, and (iv) simultaneously, producing subcooled fluids in the lower well, where the subcool is maintained by controlling the production rate so that the fluid state remains somewhat below saturated steam conditions, thereby enforcing a column of steam-free liquid just above the lower producer.

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Section: Reviewmentioning

confidence: 99%

Practical Control of SAGD Wells With Dual-Tubing Strings

Stone

Brown

Güyagüler

et al. 2014

Journal of Canadian Petroleum Technology

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A Unified Wellbore Model for Reservoir Simulation

et al. 2010

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A comprehensive well model that exists within a next-generation parallel reservoir simulator is described. It incorporates a general formulation approach which handles global phase-component partitioning allowing any number of phases and components, where any component can exist in any phase. The model can run in either isothermal or thermal mode, the latter including special features for steam injection and production. A multisegment capability enables the wellbore to be divided into segments for improved accuracy when simulating horizontal and multilateral wells. This unified well model reduces to a ‘conventional’ model when a single segment is used.

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Dynamic SAGD Well Flow Control Simulation

et al. 2010

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An investigation is presented on the use of Flow Control Valves (ICVs, FCVs) to control steam placement in the early stages of a Steam Assisted Gravity Drainage (SAGD) process. The two parts of this process that are examined in this paper are the steam circulation preheating period and the early stages up to one year of injection/production in which the steam chamber is beginning to form. Steam injection and production in this and other thermal processes can be difficult to control because steam has a high mobility ratio and tends to establish flow paths that may be difficult to break once established. This is especially pronounced in heterogeneous reservoirs. Two SAGD case studies have been designed that accurately model the initial preheating period in which both wells circulate steam through an inner tubing and outer annulus in order to conductively and, to a lesser extent convectively, heat the region around the well pair in order to establish communication. After this initial circulation period, the wells switch to injection and production. Both cases have the same base configuration but differ in the degree of reservoir heterogeneity. In the injection well, ICV devices are placed to control steam/water flow through the outer screens. In the producer, FCV valves are used to flatten the production profile along the well. Two methods are examined to change valve apertures. One uses proportional-integral-derivative (PID) controllers while the second applies an optimization algorithm directly on each individual connection productivity index. A preliminary investigation is presented here into using feedback controllers and optimization with instantaneous reservoir parameters to improve a SAGD process in the presence of reservoir heterogeneity.

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Dynamic and Static Thermal Well Flow Control Simulation

Cited by 5 publications

References 12 publications

Practical Control of SAGD Wells With Dual-Tubing Strings

Practical Control of SAGD Wells With Dual-Tubing Strings

A Unified Wellbore Model for Reservoir Simulation

Dynamic SAGD Well Flow Control Simulation

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