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7/29/2019 CementingBasic(ForUTP)(ToPrint) Part1
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This makes an interesting point... even if you were born to do a job, it doesn't necessarily mean thatyou're going to automatically do it safely... this reminds everyone that no matter how many times you'vedone a job before, be sure to think the whole thing through before you start.
You've carefully thought out all the angles. You've done it a thousand times. It comes naturally to you.You know what you're doing, its what you've been trained to do your whole life. Nothing could possibly gowrong, right ? ? ? Think again.
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BASIC CEMENTING LESSON
An External Presentation Prepared for Universiti Teknologi Petronas
Adrian Pattinasarany
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LESSON OBJECTIVES
At the end of the lesson, you should be able
to: Describe the principal functions of cement in
oil well
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s an escr e ma or proper es o acement slurry
Describe the additives used in the cementslurries and the way in which they affect the
properties of the slurry
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CONTENTS
Introduction
Classification of CementProperties of Cement
Cement Additives
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Cementing Equipments
Cementing Procedure
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INTRODUCTION TO CEMENTING
When an oil well is drilled, steel pipe
(casing) is put into the ground. Aguide shoe (a rounded, steel cover)is place in the end of the casingbeing placed in the hole to protectand guide the casing.
Common Definition of Cementing:
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e r mary emen ng rocess sthe process to fill the space thatremains between the casing and theformation (the annulus) with cementby pumping the cement slurrythrough the casing and back up the
annulus.
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Four Primary Strings of Casing
Conductor
Surface
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Production
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Reservoir
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ConductorCasing
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Reservoir
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ConductorCasing
SurfaceCasing
Cement
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Reservoir
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ConductorCasing
SurfaceCasing
Cement
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n erme a e
Casing
Cement
Reservoir
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ConductorCasing
SurfaceCasing
Cement
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n erme a e
Casing
ProductionCasing
Casing ShoeCement
Cement
Reservoir
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ConductorCasing
SurfaceCasing
Cement
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n erme a e
Casing
ProductionLiner
Casing ShoeCement
Cement
Reservoir
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• Cement supports the casing,
• Cement seals off formations
• Cement helps prevent blowouts by setting rapidly
• Cement protects the casing from the corrosiveeffects that formation fluids (as salt water) mayhave on it.
• Cement rotects casin from shock loads when
Functions of cement in oil well:
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drilling deep• Cement seals off formation areas that might allow
fluids to leak off (lost circulation or thief zones)
• Cement protects the environment by controlling the
flow of fluids• Cement can be used to plug an old well
(abandonment) or to plug a depleted zone
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Two general classification of oil well cementing
are: Primary Cementing
Secondar or Remedial Cementin
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Primary Cementingor Casing Cementingis the cementingoperation performedimmediately after thecasing has been run
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downhole. The cementis then allowed to setbefore drilling isresumed or the well is
completed.
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Liner is any string of casing
Other primary cementing: Liner Cementing
4A
1D
1C
B
C
G
H
I
K
5
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w e op o e s r ngbelow the surface of theground.
4B
1B
1A
A
D
E
F
J
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Common Secondary Cementing jobs
Plug back cementing
• Hole is plugged by cement in orderto initiate a new drilling operation
• Plug back is carried out for a
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• Abandonment of the hole• Sidetracking the hole• Seal off lost circulation
• Shutting off of water or gasintrusion “Wet” Zone
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Squeeze cementing
• Squeeze Cementing is the process of applying
hydraulic pressure to force or squeeze a cementslurry into the desired perforations, fractures,channels, or voids and force filtrate water from theslurry to create a solid mass which will harden to
Common Secondary Cementing jobs (cont’d)
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prov e t e es re sea .
• The operation is performed during drilling,completion and work over operations
• Main purpose of squeeze cementing :-• Supplementing a faulty primary cementing job• Repairing casing defects• Supplementing a faulty perforation job
• Reducing water cut in a producing well
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ASTM (American Society for Testing and Materials) and API(American Petroleum Institute) standard procedures
Testing for construction cement According to ASTM C 150-99a - chemical composition
ASTM C1157-00 – performance criteria
CLASSIFICATION OF CEMENT
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Testing for oil well cement API Standards 10A , ISO Standard 10426-1- chemical composition and
performance criteria
HALLIBURTON, as a member, is involved in the committees that develop
these industry wide policies.
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In Summary
FUNCTIONS OF OIL WELL CEMENT
PROPERTIES OF A CEMENT SLURRY
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ADDITIVES USED IN THE CEMENT