Well test analysis

Well Testing & Well Test Analysis
My website
www.egypetroleum.com
Well testing
&
Well test analysis
Eng: Khalid Ahmed Aramah Al-Khalifi
Email : kaaa210@gmail.com Mobile : 00967739423888

Contents:
1- Objectives
2- Introduction
3- Type of Well Testing
4- Well Test Simulation Software Programs
5- Conclusion

7- www.egypetroleum.com
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.

3- Types of well testing
1- Productivity Testing
Development wells
2- Descriptive Testing
Exploration and appraisal wells
3.1- Productivity Well Testing
 Well deliverability
 Inflow Performance Relationship (IPR)
 IPR governed by rock-fluid properties and near-wellbore conditions
 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

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
 Evaluate reservoir permeability
 Well Damage: Skin
 Assess reservoir extent & geometry
 Determine communication between zones and wells
 Evaluate results of stimulation treatments
Darcy Law - Absolute Permeability K
Skin

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.

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.
iac (Schlumberger)Zod)-4
Consists of two separate programs: test design and test
-interpretation. Each of these is divided into a number of sub
Has a useful section for layered reservoir tests. Andmodules
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..ECLIPSE to calculate numerical solutions to well tests
within the ECLIPSE suite of applications, e.g. SimOpt..

WELTEST 200
Well Test Analysis & Simulation

 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
 Reservoir Geology
 Fluid Properties and Multi-Phase Flow
 Wells and Perforations
 What is Weltest 200?
 Weltest 200 is a Unique and Powerful Combination of Key Technologies in
one Single Programme
 Weltest 200 Links Classical (Analytical) Well Test Analysis with Numerical
Simulation and Advanced Gridding Technology
 Weltest 200 also offers a Very Advanced Graphical User Interface (GUI)
which Increases the Productivity of the Engineer
Reservoir
Mechanism
Output ResponseInput Perturbation

Weltest 200 Programme Overview
1- Weltest200 Programme Structure
 Main Programme Sections
 Define: Basic reservoir and well data input
 Prepare Data: Gauge file reading and data manipulation
 Properties: Fluid properties description
 Analyse: Well test interpretation on diagnostic plots
 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:
 Single-phase Data Input
 Multi-phase Flow Correlations
 Automatic Conversion between Single- and Multi-Phase Option (and vice versa)
 Condensate and Compositional Option (Gas)
 Generation of Pseudo-Properties
 Input and Generation of Relative Permeability and Capillary Pressure Tables (Corey-
Functions)
 Analyse Module:
 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

 Pressure Measurement in Wellbore:
 Uniform Flux
 Inf. Cond (Gringarten correlation)
 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

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
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

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.

-* A simple introduction to the program :
and easiest software used in oil wells testExamination of the well of the best
program .
company that offers manyFeketeThe program submitted by-F.A.S.T welltest :
specialized programs in the oil fields .
Choose

Liquid IPR ) .The well test which we will use in this program is the (

-* Interface test IPR :

We change the system of units by pressing
At the top of the program interface .
Note the change in the system of units .

-Example :
* We incorporate the data into the program .

on the productivity of oil and water at each pressure point .We got

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 ………………………..
FOR MORE BOOK VISIT MY SITE

Well test analysis

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