Overview

Integrated design analysis for casing and tubing configurations

Landmark’s WELLCAT™ software provides precise solutions for both wellbore analysis and integrated casing and tubingdesign. The software calculates accurate downhole temperature and pressure profiles which can be used for pipe-bodymovement and casing and tubing load analysis. WELLCAT software is the tool of choice for many companies operating inhigh-pressure, high-temperature (HPHT) deepwater or heavy oil drilling and production environments.

The software integrates five modules into a common environment to provide more accurate and reliable solutions to complexdesign problems. Thermal effects are modeled for drilling and production operations. A comprehensive analysis of loads andstresses on casing and tubing is provided, including service life analysis. Detailed analysis of the entire casing system isprovided to understand the effects of annular pressure buildup and the interaction in the casing and tubing systems within awell. Loads and their resulting wellhead movement are evaluated to determine the integrity of the well tubulars.

WELLCAT software is a component of The Engineer's Desktop™ software suite of technologies, which enables integratedoperations reporting, drilling and completions engineering and well planning workflows. The Engineer's Desktop suite isintegrated on the Engineer's Data Model™ software platform.

Benefits

Comprehensive SolutionsProvides powerful casing and tubing analysis for simple tocomplex well configurations including tension leg platformsin a single application.

Understanding of Wellhead MovementDetermines and redistributes loads in the casing system forcritical well design.

Reduce Casing and Tubing CostsEfficient and accurate designs based on user-defined loadconditions can help lower casing and tubing costs.

Integrated Design CanImprove SafetyWELLCAT™ software technologyhelps engineers design safer, higherquality designs for complex HPHTwells. Understanding thermalexpansion of annular fluids can helpengineers design casing that canmanage thermally induced wellheadmovement, eliminate buckling andreduce casing collapse of inner stringsor casing burst of outer stringsduring production operations.

WELLCAT™ Software

Features

Drill Design ModuleThe Drill Design module simulates flow and heat transferduring drilling operations, providing full transient analysis. Thesoftware offers linked analyses with the Casing design module.

The Drill design module is useful for:

• Cementing operations temperatures, including innerstring cementing.

• HPHT hydraulics

• Downhole tool temperatures

• Subsea wellhead and BOP temperatures

• Hydrate inhibition program schedule

• Casing service loads during drilling

• Undisturbed temperature profile from log and drilling data

• Multistring initial conditions annular pressure buildup and WHM load history

Display of Inner String Cementing operation WellSchematic and Temperature results comparison againstnormal cementing job.

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Casing Design ModuleThe Casing Design module analyzes casing loads, designintegrity and buckling behavior under complex mechanical,fluid pressure and thermal loading conditions with standardand automatic load-case generation. Analyses may beperformed in conjunction with Drill and Prod module designs.

The Casing Design module is useful for:

• Comprehensive casing design and analysis

• Installation and service loads

• Multistring load transfer (initial conditions)

• Buckling stability and post-buckling analysis with andwithout centralizers

• Displaying the ISO ellipse with user-defined connectionperformance curves and ISO service load safety factors.

Prod Design ModuleThe Prod Design module simulates fluid and heat transferduring completion, production, stimulation, testing and wellservicing operations. The software allows transient andsteady-state analysis for single-phase and multiphase flow inaddition to providing initial conditions linkage with thermalresults from the Drill design module. It also offers linkedanalyses with Tube and Casing modules. The moduleincludes VLE (Vapor liquid equilibrium) phase diagramswith definition of temperature and pressure critical point.

The Prod Design module is useful for:

• Analysis of temperatures and pressures for flowing andshut-in well streams

• Analysis of temperatures and pressures during forwardand reverse circulation

• Gas-lift operations

• Multistring Final Conditions Annular pressure buildupand WHM Load History

Display of the ISO ellipse with a user-defined connection performancecurves and calculation of safety factors based on the data.

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• Thermo-setting resin and gel treatments

• Insulation requirements and permafrost thaw assessment

• Fracture and acid stimulation jobs

• Ability to model steam injection (saturated or superheated)

• Ability to model a diversity of fluid type inventory including:

-- Standard and compositional muds

-- Standard, VLE and fine-defined hydrocarbons

-- Brines, polymers and foams

-- General and synthetic muds

-- Cement slurries

• Mechanistic models for improved pressure-drop calculations:

-- Zhang model (deviated wells, upward/downward flow)

-- Kaya model (deviated wells)

-- Ansari model (Near-vertical wells less than 15 degrees)

Tube Design ModuleThe Tube Design module analyzes tubing loads andmovements, buckling behavior and design integrity undercomplex mechanical, fluid pressure and thermal loadingconditions with standard and automatic load-case generation.Offers linked analyses with the Prod Design module.

The Tube Design module is useful for:

• Comprehensive tubing design and analysis

• Installation and service loads

• Mechanically, hydrostatically and hydraulically setting mechanisms

• Packer setting sequence

• Tubing movement

• Tubing-to-packer and packer-to-casing forces

Display of Synthetic Fluid input dialog, Pressure Temperature Densityplot overlapping Fluid Temperature Results

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• Multiple string andmultiple packercompletions

• CRA (Corrosion andErosion ResistantAlloy) tubulars withyield anisotropy

• Displays the ISOellipse along with a user-definedconnectionperformance curve

• Packer and expansion joint schematics make it easy tovisually review and check forces associated with differentpackers and expansion joints

Multistring Design ModuleThe Multistring Design module predicts pressure andvolume changes due to annular pressure buildup (APB)when the well system heats up as a result of productionoperations or the injection of hot fluids into the well.

The Multistring Design module determines the movementthat occurs to the wellhead during the life of the well.Movement is calculated due to strings being run andcemented, static loads being added or removed from thewell (nipple-up BOP, hang-off drillstring during a drive-offsituation) and pressure or thermally induced loads appliedto each individual string in the well. Analyses are linked toDrill, Prod, Tube and Casing.

The Multistring design module is useful for:

• Trapped annuli in subsea operations for determination oftubular burst and collapse loads due to APB

• Structural integrity of uncemented (unsupported)conductor/structural casing in platform operations dueto wellhead movement and load redistribution

• Wellhead movement analysis also includes; Point ofFixity, Lock- Ring Rating, Lift Off Analysis andProgressive Failure Analysis features

• A comprehensive well-soil interaction model forMultistring well stress analysis. This model predictswellhead movement and determines the integrity of the foundation.

VIT ModelingThe VIT (vacuum insulated tubing) enhancements addcritical technology to the WELLCAT modules aimedspecifically at solving vacuum insulated tubing (VIT)applications for deep water and heavy oil design problems.The deep water capabilities include temperature mitigation

enhancement (usingvacuum insulatedtubing) and well headmovement progressivefailure analysis. Theheavy oil capabilitiesare designed for hightemperature steaminjection scenarios.

The VIT option isused to model vacuuminsulated tubingwithin WELLCATapplication. VIT isused to mitigate therisks of annular

pressure buildup (APB), cold startups and heavy oilproduction when using the latest VIT systems.

Annular Pressure Buildup

• In deepwater, high-temperature and high annularpressure can cause casing strings to collapse and henceoperators use VIT to mitigate the risk. VIT temperaturemodeling using the Temp Mitigate module combinedwith the WELLCAT Multistring design module helpsmodel these possible scenarios.

Cold Startups

• In some subsea completions, a cold startup (initial flow)can be hampered or made impossible because oftemperature losses and hydrating near the seabedmudline. VIT minimizes this problem by maintainingwellbore temperatures to prevent hydrate formation. Themodeling of these temperature and pressure conditionsfor VIT can now be analyzed using the WELLCAT TempMitigate feature.

Heavy Oil Production

• In heavy oil production scenarios VIT helps maintainlower viscosity levels in steam flooding, "huff and puff "and steam-assisted gravity drainage (SAGD) projects,reducing the need for artificial lift techniques andincreasing total ultimate recovery (reservoir draw down).

• Temperature and pressure modeling for vacuuminsulated tubing using the Temp Mitigate featurecombined with WELLCAT Steam injection modelingmodule is possible in heavy oil production scenarios.

Well head movement progressive failure analysis enables auser to obtain axial loads and contact forces of the entiresystem after the hanger rating is exceeded. WELLCAT willdistribute the loads through the system once the hangerrating are exceeded and only stop reporting once the ratingequal the loading condition.

VIT modeling is integrated withmultiple WELLCAT software capabilitiesincluding temperature simulation, stressand multistring AFE analysis.

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Expansion joint schematics and PackerDialog with capabilities for multiplepacker setting sequence overlappingother Tube Schematics.

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The VIT and Progressive Failure Analysis features arelicensed separately to be used in conjunction with theProduction, Tube and Multistring design modules.

Steam ModelingThe WellCAT Steam modelling option is used to modelmultiple steam injection scenarios including injectionthrough tubing, injection down the tubing annulus andsimultaneous injection though both tubing and annulus.

The modeling handles super-heated steam or saturatedsteam with a given quality. The technology uses the rigorousPVT model for steam and water developed by the NationalInstitute of Standards and Technology (NIST).

Transient or steady-state calculations output steam qualityverses depth and fluid temperature and pressure versesdepth analysis. In addition the calculations output steamquality verses time at a specified depth to help determine thesteam breakthrough at the perforations.

Temperatures calculated for the wellbore or wellborecomponents can be used within WELLCAT for stressanalysis, annular pressure buildup analysis, and wellheadmovement calculations.

Detailed Results PresentationPresentation of calculation results on-screen allows user-configurable, multi-pane spreadsheet and plot formats withuser definition of custom and preconfigured display tabs.Presentation of print results is in both standard and user-configurable formats. Template features for setting standarddefault configurations are included.

Multiple Unit SystemsFeatures English, metric and custom unit systems along witha comprehensive online help system.

Easily Transfer or Export DataLinks to DEX™ software, Landmark’s data exchangesoftware, permits easy transfer of relevant data to otherDEX-compliant applications. Also send data from anyWELLCAT spreadsheet to Microsoft® EXCEL (input andoutput results). Import pore pressure or fracture gradientdata from an ASCII file or EXCEL spreadsheet.

WELLCAT™ software is a component of The Engineer'sDesktop™ software suite of technologies sharing design datawith other EDT applications including StressCheck™.

User-Friendly InterfaceWELLCAT makes extensive use of Microsoft® Windows®features, menus and dialogs for easy data entry. Contains acontext-driven Input Wizard to guide the user throughproblem formulation. Data entry has spreadsheet-like interfaceand supports cut and paste and drag and drop functions.

WELLCAT PackagingTubulars Drilling Package – Includes WELLCAT Drill andCasing design modules.

Tubulars Production Package – Includes WELLCAT Tubeand Prod design modules are licensed as the.

Tubulars Advanced Package – Includes WELLCAT Tube,Prod, Drill, Casing and Multistring design modules.

Steam Package – Includes WELLCAT Steam module. Thesetechnologies are licensed to be used in conjunction with theProd, Tube and Multistring Design modules.

Deepwater Package – Includes WELLCAT VIT and WellHead Movement Progressive Failure Analysis features. Thesetechnologies are licensed to be used in conjunction with theProd, Tube and Multistring Design modules.

HardwareRecommended: 2 GHz processor or greater, 1 GB RAM orgreater, 2-4 GB available disk space, SVGA color monitor, CD-ROM drive.

Operating System(s)Microsoft® Windows® Vista Enterprise Windows® XP Professional, Service Pack 2 Windows® 2003 Server, Service Pack 2

SoftwareEngineer’s Data Model (EDM) R5000.1

Related Landmark Software ProductsEngineer’s Data Model™ (EDM™)StressCheck™CasingSeat™COMPASS™Presgraf™DEX™

WELLCAT™ Software

Requirements: Hardware / Software / Operating System

Sales of Landmark products and services will be in accord solely with the terms and conditionscontained in the contract between Landmark andthe customer that is applicable to the sale.

H05630-A4 10 /08© 2008 Landmark GraphicsCorporation. All RightsReserved. Printed in U.S.A. HALLIBURTON

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