well test interpretation 1.pptx

8/13/2019 well test interpretation 1.pptx

1/15

Lesson 1 - Introduction

*


2/15

*Reservoir Engineers have to come up with an

optimal field development strategy

Field DevelopmentStrategy

EconomicModel

ReservoirModel


3/15

*The Economic Model

takes into account present and projected

economic information, such as:

Price of oil and gas

Interest rate

Return on investment

Etc.


4/15

*The Reservoir Model

is used to predict the physical behavior of

the field, in terms of rate of production,

and fluid recovery, for different

operating conditions.


5/15

*In order to perform realistic predictions, the

reservoir model must represent the actual

reservoir as closely as possible.

*A reservoir model is neverdefinitive, but must

be adjusted as new information becomes

available when additional wells are drilled


6/15

*The parameters used for the construction of

reservoir model are obtained from:

Direct measurements

On cores or cuttings while drilling,

on PVT samples etc.

Results of interpretation of:

Seismic data

Electric log data

Well test data etc.


7/15

*Only well testing provides information on the

dynamic behaviorof a reservoir.

*A well test may provide information on:

Permeability

Initial or average reservoir pressure

Near well bore conditions

Reservoir flow behavior

Reservoir size

Inflow performance responseCommunication between wells etc.


8/15

*A well test essentially consist of recording the

down hole pressure response due to changes in

flowrate.

*The response, which is a function of reservoir

characteristics and the production history, can

be interpreted by analysis of the change inpressure p, versus elapsed time t.


9/15

*Well test objectives:

Reservoir Evaluation

Reservoir Management

Reservoir Description


10/15

*Reservoir Evaluation

To reach a decision on how to produce a

reservoir or not to produce it at all, we

need to evaluate the reservoir.

*We need the following data:

Deliverability

PropertiesSize


11/15

*Reservoir Management

During the life of the reservoir, we need

to monitor its performance and well

condition


12/15

*Reservoir Description

Well test data can be used for reservoir

description


13/15

*Well testing and decline curve analysis:

In pressure transient analysis, the

pressure transient is considered to be a

response of a specific flow rate history. In

DCA, we consider flowrate response to a

specific pressure history.

*Theoretically, both are same. Practical

applications are different.


14/15

*Next Lecture:

Types of well tests, continued discussion

on fundamentals


15/15

*References:

1. System analysis part 1, Well testinterpretation for monophasic oil byanalysis of pressure behavior by FlopetrolJohnston Schlumberger

2. Modern well test analysis a computeraided approachby Ronald N. Horne

well test interpretation 1.pptx

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