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SYEDA MISHA QAZI

2011-PET-64

INTRODUCTION TO WELL TESTING

Introduction To Well Testing1

Types Of Well Testing2

Well Test Interpretation Methodologies

3

Introduction To Ecrin Software & Conclusion

4

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Introduction To Well Testing

2

3Well testing is the technique and method for the evaluation of well conditions and reservoir characteristics

Initial reservoir pressure Average pressure Permeability Skin(formation damage and stimulation) Communication between wells Flow barriers and fluid contacts

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4A step by step process is required to find the well test

interpretation model

Identification of interpretation model

Calculation of the interpretation model parameters

Verification of interpretation model

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5ETR (Early time region): During which pressure transient is moving through the formation near the well bore. MTR (Middle time region): During which the pressure transient has moved away from the well bore .LTR (Late Time region): During which radius of investigation reached the boundary

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Types of Well Testing

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9Well testing is divided into two major categories which are

further subdivided into different types:

Pressure Transient Testing Build up test Draw down test

Deliverability Testing Flow after flow test Isochronal test Modified isochronal test

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10

The well is first produced at

a constant rate till pressure

is stabilized and

Then the well is shut in.

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Shut in the well till pressure

stabilizes

Then flow the well at a constant rate

q & measuring Pwf.

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Well flows under a constant

rate until it reaches stabilized

conditions (pseudo steady

state).

After the stabilized rate and

pressure are recorded, the rate

is changed and the well flows

until pressure stabilizes again.

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An isochronal test is

conducted by flowing a well at

a fixed rate, then shutting it in

until the pressure builds up to

an unchanging (or almost

unchanging) value.

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In the modified isochronal test

shut-in periods are of the same

duration as the flow periods

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Well Test Interpretation Methodologies

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16

A conventional technique for reservoir parameter determination is

semi log analysis. In this analysis technique the pressure data is

plotted versus time

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The pressure derivative curves have given the well testing a new

dimension in resolving the issues related to reservoir model

identification

Rameys type curve McKinley type curve Gringarten type curve Bourdet type curves are one of the

famous derivative type

Curves.

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Introduction To ECRIN Software

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Ecrin is the most powerful tool for well test analysis in the industries. It has different

modules that can help to identify model and predict the reservoir behavior.

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Aid the interpreter to choose the model that may

finally match the data and yield the results

The diagnostic phase includes the search for all flow regimes that

may be present in the response of the extracted period.

This will allow you to run a non linear regression to improve the

match between the model and data.

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Well testing is one of the most important tools for understanding and characterizing our reservoirs.

Well testing is based on analyzing draw down or buildup data.

This analysis involves study of pressure on semi log plot and derivative plot.

Ecrin is the commercial software to understand and interpret the reservoir parameters.

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Pressure Transient Testing by John Lee

Reservoir engineering handbook by Tarek Ahmed

SPE 102079-From Straight Line To Deconvolution: the Evolution Of The State Of Art In Well Test Analysis by A.C.Gringarten (2006)

Well Testing And Interpretation by D.Bourdet

Saphire guided session #01 by Kappa (1988-2008)

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