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 : [email protected] Mobile : 00967739423888

http://www.egypetroleum.com/

mailto:[email protected]


www.egypetroleum.com

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 . 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 ..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

MechanismOutput 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 test Examination of the well of the best

program .

company that offers many FeketeThe 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



Date post:	13-Feb-2017
Category:	Engineering
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Well test analysis

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