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- 1. Well Testing & Well Test Analysis Well testing & Well test analysis Eng: Khalid Ahmed Aramah Al-Khalifi Email : kaaa210@gmail.com Mobile : 00967739423888
- 2. Well Testing & Well Test Analysis Contents: 1- Objectives 2- Introduction 3- Type of Well Testing 4- Well Test Simulation Software Programs 5- Conclusion
- 3. Well Testing & Well Test Analysis 1- Objectives: 1- Identify type of well testing 2- Identify methods of well testing interpretation 3- Identify the software programs which used in well testing analysis 2- Introduction: Why well Testing? Tests on oil and gas wells are performed at various stages of drilling, completion and production. The test objectives at each stage range from simple identification of produced fluids and determination of reservoir deliverability to the characterization of complex reservoir features. Most well tests can be grouped either as productivity testing or as descriptive/reservoir testing. • Productivity well tests are conducted to; o Identify produced fluids and determine their respective volume ratios. o Measure reservoir pressure and temperature. o Obtain samples suitable for PVT analysis. o Determine well deliverability. o Evaluate completion efficiency. o Characterize well damage. o Evaluate workover or stimulation treatment. • Descriptive tests seek to; o Evaluate reservoir parameters. o Characterize reservoir heterogeneities. o Assess reservoir extent and geometry. o Determine hydraulic communication between wells.
- 4. Well Testing & Well Test Analysis 3- Types of well testing 1- Productivity Testing Development wells 2- Descriptive Testing Exploration and appraisal wells 3.1- Productivity Well Testing • Well deliverability Ø Inflow Performance Relationship (IPR) Ø IPR governed by rock-fluid properties and near-wellbore conditions Ø PI = STB/psi = 1/(IPR slope) =Q/(Pi-Pwf) Where: PI – Productivity Index Q- Total production BPD Pi-Reservoir pressure Pwf- wellbore pressure Pi-Pwf= Drawdown IPR Curve
- 5. Well Testing & Well Test Analysis 3.2-Descriptive Well Testing • Identify produced fluids and flow rates • Measure Reservoir P & T • Well deliverability and completion efficiency • Formation fluid samples for PVT analysis Ø Evaluate reservoir permeability Ø Well Damage: Skin Ø Assess reservoir extent & geometry Ø Determine communication between zones and wells Ø Evaluate results of stimulation treatments Darcy Law - Absolute Permeability K Skin
- 6. Well Testing & Well Test Analysis 3.3- Draw-Down Test (DD): • A well is flown at a constant rate and the pressure change (decline) is monitored • Derived Parameters: k, s, d 3.4- Build-Up Test (BU): • A flowing well is shut in and the pressure change (build-up) is monitored • Constant rate assumption during a test is easily achieved (zero production!) • Derived Parameters: k, , d, s (indirect), Pi, 4-Well Test Simulation Software Programs • In well testing in general and in well test interpretation software there are several software programs • Numerical well testing is becoming popular • Integrated interpretation methodology incorporating both analytical and numerical techniques is required. The most famous Well Test Software programs are: 1- Saphir (Kappa): One of the easiest to use and most popular well testing packages available in the market today. Has around 1400 site licenses with 200 companies (including Schlumberger). 2- PanSystem (EPS): • PanSystem is a popular well test analysis software - probably more ‘scientific’ than Saphir. • Reasonable graphical user interface and has all features of an advanced well test interpretation package. • Has an integrated interpretation environment involving derivative plots, specialized analysis, and non-linear regression. • PanSystem has an interface to numerical simulation - PanMesh is based on finite-element technology.
- 7. Well Testing & Well Test Analysis 3-Interpret 2000 (Baker Hughes) • Conventional analytical interpretation and modelling application - much of the original program development was by Alain Gringarten. • No numerical options. • Has a nice user interface, which appears to be very similar to Saphir. Zodiac (Schlumberger) ( - 4 Consists of two separate programs: test design and test - into a number of sub interpretation. Each of these is divided Has a useful section for layered reservoir tests . And modules and selective inflow performance (SIP) analysis . . 5- Weltest 200 (Schlumberger). Weltest 200 is an integrated well test analysis package which is able to use It is partially integrated .. calculate numerical solutions to well tests ECLIPSE to within the ECLIPSE suite of applications, e.g. SimOpt . .
- 8. Well Testing & Well Test Analysis WELTEST 200 Well Test Analysis & Simulation
- 9. Well Testing & Well Test Analysis • What is Well Test Analysis ? 1- Well Test analysis is an inverse problem in which the model parameters are inferred by analysing response of the reservoir to a given input 2- Most often the output response that is measured is pressure and the applied input perturbation is rate change. 3-We use mathematical models to relate pressure response to rate history. The model may or may not represent reality. • Numerical Well Testing Use of Simulation Technology to Accurately Model Ø Reservoir Geology Ø Fluid Properties and Multi-Phase Flow Ø Wells and Perforations • What is Weltest 200? Ø Weltest 200 is a Unique and Powerful Combina on of Key Technologies in one Single Programme Ø Weltest 200 Links Classical (Analy cal) Well Test Analysis with Numerical Simulation and Advanced Gridding Technology Ø Weltest 200 also offers a Very Advanced Graphical User Interface (GUI) which Increases the Productivity of the Engineer Reservoir Mechanism Output Response Input Perturbation
- 10. Well Testing & Well Test Analysis Weltest 200 Programme Overview 1- Weltest200 Programme Structure • Main Programme Sections Ø Define: Basic reservoir and well data input Ø Prepare Data: Gauge file reading and data manipulation Ø Properties: Fluid properties description Ø Analyse: Well test interpretation on diagnostic plots Ø Numerical Models: Radial: Numerical simulation using Radial grids PEBI: Numerical simulation using flexible PEBI grids • AuxilliaryProgrammes o Calculator: Built-in programming language o Text Editor o Relational Database (C-Tree) o Online Help (FrameViewer) o Template Mechanism (Interface- and Report Writing) o Built-in Contouring Package (ConPac) 2- Weltest200 Product Features • PVT and Fluid Module: Ø Single-phase Data Input Ø Multi-phase Flow Correlations Ø Automatic Conversion between Single- and Multi-Phase Option (and vice versa( Ø Condensate and Compositional Option (Gas( Ø Generation of Pseudo-Properties Ø Input and Generation of Relative Permeability and Capillary Pressure Tables (Corey- Functions( • Analyse Module: Ø Test Types: § Drawdown, Buildup, Injection, Fall-Off § Gas Tests: Flow-after-Flow, (Modified) Isoschronal Test (incl. Rate- Dependent Skin, LIT, Back Pressure, Deliverability) § Interference § Slug Test Ø Pressure Measurement in Wellbore: § Uniform Flux § Inf. Cond (Gringarten correlation)
- 11. Well Testing & Well Test Analysis Ø Type Curves: § WBS&Skin § Single Parameter Model § Hydr. Fractures: Uniform Flux, Inf. Cond., Finite Cond., Finite Cond. in linear reservoir, WHC § Single Interference Well § MBH Rectangular Curves § Slug Test Main Features ) ( FAST TRAC - Problem Definition Specify Initial pressure, anddatum depth, and layer(s)static properties Specify the main flowing phases Specify Viscosity,Ct and Bo Specify well configuration and perforation depth
- 12. Well Testing & Well Test Analysis Fluid Properties Description § Built-in correlations may be used to get quick estimations of fluid parameters § In numerical well testing it is possible to account for
- 13. Well Testing & Well Test Analysis Data Preparation-( Two Options) 1- Enter data: specify gauge name, depth and units of measurement. Data entered interactively or from clipboard 2- Read data: specify gauge file and identify rows and columns to be loaded. May view file in the process. Also specify maximum number of errors.
- 14. Well Testing & Well Test Analysis - * A simple introduction to the program : Examination of the well of the best and easiest software used in oil wells test program . company that offers many Fekete The program submitted by - F.A.S.T welltest : specialized programs in the oil fields . Choose
- 15. Well Testing & Well Test Analysis The well test which we will use in this program is the ( Liquid IPR ) .
- 16. Well Testing & Well Test Analysis - * Interface test IPR :
- 17. Well Testing & Well Test Analysis We change the system of units by pressing top of the program interface . At the Note the change in the system of units .
- 18. Well Testing & Well Test Analysis - Example : * We incorporate the data into the program .
- 19. Well Testing & Well Test Analysis We got on the productivity of oil and water at each pressure point .
- 20. Well Testing & Well Test Analysis
- 21. Well Testing & Well Test Analysis Conclusion: 1- There are many Well test programs in the market, using any one depends on what type of data we need. 2- Using inadequate program that is mean wrong required data 3- By using well test programs we minimize the cost for data acquisition 4- We can get full idea about Reservoir by using well test software program 5- We can put our plan for oil field in future by using welltestprogramm Thank You ………………………..