Unsteady State Wellbore Simulator
ü Production Well Optimization
ü Liquid Loading prediction
ü Gas lift modelling
ü Low Introductory Pricing
Full Wellbore Segment simulations – more powerful than nodal analysis
Ø Solves mass balance equations for the segments of the pipes in a well to obtain pressure, saturation and rate profiles.
Ø Calculates changing pressures, saturations, rates in wellbore as reservoir influx or well offtake/injection changes with time
Ø Co-current and counter-current multiphase flow in vertical/inclined/horizontal pipe using Beggs-Brill multiphase correlation
Black Oil/ Gas Condensate/ Gas-Water PVT data
Ø Oil/Gas/Water Formation Volume Factors and Viscosities, Solution Gas-Oil Ratio, Condensate-Gas Ratio
Wellbore is divided into segments of user specified length
Ø Using well deviation survey, well trajectory is divided into segments for flow/mass calculation
Ø Multiple pipes of varying diameter, concentric and also side by side.
Ø Segments can be perforated/plugged for reservoir and inter-pipe flow.
Ø Transient calculation of Pressure, Oil/Water/Gas Rates and Saturations in wellbore segments.
Ø Multiple wellbore segments can be connected to reservoir at different times
Ø Multiple attached reservoirs can be defined with varying Pressure, oil/water/gas saturations, PVT tables, Relative Permeability tables for variable influx calculation.
Ø Reservoir influx rates can be also be specified directly and changed with time.
Multiple pipe offtake/injection points.
Ø Time dependent pressure and maximum production/injection rate constraints.
Ø Produce reservoir fluid from one pipe and inject into another pipe of the well ( eg Gas lifting)
Pump head curves, inline chokes, Flow Control Devices
Ø Position, size or modify with time to optimize well flow
ü Detailed analysis of wellbore flow for different pipe configurations and operating conditions as a function of time. Obtain pressure, saturations, flow rates and direction of flow for individual segments of discretized pipes. Optimize number of pipes, pipe sizing, and perforations by analysis of pressure drop and rates.
ü Position and size inline choke, flow control devices and pumps
ü Estimate when liquid loading occurs by changing reservoir pressure, gas-liquid ratios, offtake pressures with time until well stops flowing.
ü Model gas lift injection to unload liquid water or condensate. Simulate varying gas lift rates, tubing string sizes and pressures.
ü Multiple reservoir zones - Multiple wellbore segments may be joined to reservoir – model a well producing from several reservoirs of different PVT properties, commingled into the same producing tubing or with packers separating flow into annuli and production tubing.
ü Model a long horizontal well with many wellbore segments producing from several reservoir zones or hydraulic fracs as function of time.
Easy to Use Graphical Interface
Data File Builder
· Create new, modify and save data sets
· Tab identified Input forms with Spreadsheets, List boxes, error checking
· Specify Timestep size and output intervals, restart file writes
· Black Oil PVT data from Correlation
· Import Wellbore survey to discretize well
· Specify pipe sizes, perforations, chokes, pumps- change with time
· Enter Reservoir pressures, saturations, or fixed rates as function of time
· Specify offtake points with pressure and maximum withdrawal rates, injection points with pressure and injection rates
· Pump head curve
Run Data Files
· Select a list of data files to run 2 at a time.
· Review simulator messages
· Open Data File or Results file of selected run file
· Select pipes, series, and times for spreadsheet report of segments.
· Report rates, cumulatives at production/injection points
· Report reservoir rates and cumulatives
· Graph reports
· Wellbore schematic of report parameters colored and animated with time
Help PDF documentation
· How to use videos
· Videos of simulation of Wellbore with Time for Liquid Loading and Gas Lift
Overview of the User Interface of the Unsteady State Wellbore Simulator (USWS) with Black Oil PVT properties
Click to watch
USWS - Gas Bubble Rising in a Pipe filled with Water
Shows multiphase counter current flow of gas and water in a vertical pipe.
Gravity segregation of gas and water.
Click to watch
USWS - Gas water loading – then add gaslift tubing
Decline reservoir pressure until upward gas-water flow stops and water loading occurs.
Add gas lift tubing and inject gas rate to extend production period.
USWS – Oil Well Depletion with Gas Lift
Oil Well Reservoir Pressure declines until well stops flowing. Gas Lift injection to extend production. Increase gas lift rate with time.
USWS - Gas Condensate Loading with gas lift
Depletion of gas condensate reservoir, showing well condensate and gas rates as reservoir pressure decreases with time. Shows condensate loading when pressure drops too low to flow. Adding gas lift to maintain production. Too much gas lift gas restricts condensate recovery.
USWS – Oil Well depletion - add a pump to extend production
Well producing oil and water – decline reservoir pressure until well stops flowing. Add a tubing string with pump and size head curve to extend production of well.
USWS – Liner FCDs and Inline choke
How to place liner chokes and inline chokes to control production
For more information, contact:-
T.T. & Associates Inc
C/o PetroStudies Consultants Inc
#204, 4603 Varsity Drive NW
Calgary, Alberta, T3A 2V7, Canada