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AN OVERVIEW OF WELL COMPLETION

DESIGN

PRESENTED

By

JUDITH UZOH OGECHUKWU

Department of p etroleum engineer ing(RSUST)

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OUTLINEINTRODUCTION

WHAT IS WELL COMPLETION?DESIGN CONSIDERATIONS

DRILLING PHASE

COMPLETION PHASE

COMPLETION DESIGN REQUIREMENTS FORMFUNCTIONAL REQUIREMENTS FOR A

COMPLETION STRING

COMPLETION DESIGN ACCESORIES

CONCLUSION

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INTRODUCTION

In simple terms, the term well completion refers to the

methods by which a newly drilled well can be finalised

so that reservoir fluids can be produced to surface

production facilities efficiently and safely. In general, a

well is the communication link between the surfaceand the reservoir and it represents a large percentage

of the expenditure in the development of an oil or gas

field. It is of utmost importance that the

well be completed correctly at the onset, in order that

maximum overall productivity of the field may beobtained. The ideal completion is the lowest cost

completion which will meet the demands placed on it

during its producing lifetime.

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WHATISWELLCOMPLETION

Completing a well means installing

equipment in the well to allow a safe and

controlled flow of petroleum from the well

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DESIGNCONSIDERATIONS

1.

DRILLING PHASE

RESERVOIR CONSIDERATIONS

MECHANICAL CONSIDERATIONS

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RESERVOIR CONSIDERATIONS

Producing rate

Multiple reservoirsReservoir drive mechanism

Secondary recovery requirements

StimulationSand control

Artificial lift

Workover requirements.

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MECHANICAL CONSIDERATIONS

Functional requirements

Operating conditionsComponent design

Component reliability

Safety.

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This shows an example of a typical drilling and casing

schedule

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COMPLETIONPHASE

Oil and gas completion companies are often

consulted to assist with well completion

designs or the development of detailedequipment specifications. To accomplish

this, three major issues must be considered:

Form, Fit and Function of the tools

MetallurgyElastomeric Materials and seal Design

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COMPLETION DESIGN REQUIREMENT

FORM

This is a form indicating the completion

requirements and well data needed.

Either imperial or metric units may beused but should be clearly identified

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FUNCTIONAL REQUIREMENTS OF A

COMPLETION STRING

Consider the casing schematic of Figure 2. Theobjective is to design a completion string for this

well with following basic functional requirements:

To provide optimum flowing conditions;

To protect the casing from well fluids;To contain reservoir pressure in an emergency;

To enable down hole chemical injection;

To enable the well to be put in a safe

condition prior to removing the production

conduit (i.e. to be killed);

To enable routine downhole operations.

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COMPLETIONDESIGNACCESSORIES

PackersSub-Surface Safety Valves (SSSV)

Flow Control Equipment

Tubulars

Gas Lift Mandrels

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CONCLUSION

In simple terms, the term well

completion refers to the methods by

which a newly drilled well can befinalised so that reservoir fluids can be

produced to surface production facilities

efficiently and safely. An Appropriate

design should be choosen.