SLB Squeeze Cementing

Cementin menting g Desig sign, n, Executio Execution n and Evaluation for Low Pressured Re Reservoir  Au  A u g 24t h 2005

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Initials

Squeeze?? 

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Dowell? , Client?, or well ?

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Definition packer  

Injection of Cement Slurry

tubing FORMATION

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Perforations, Casing Leak,

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Channels

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Below or above fracture pressure

casing cement slurry

cement nodes

DEHYDRATED CEMENT

PRIMARY CEMENT CHANNEL BEHIND CASING

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Initials

Applications

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Primary cement job repair

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Zonal Isolation

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Zone Abandonment

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Casing Leaks

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Lost Circulation

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Basic Concept 

Filtration Process – Differential pressure applied

casing

DEHYDRATED CEMENT

– Porous medium – Filter cake deposition

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FORMATION PRIMARY CEMENT

cement nodes

Effect of Fluid Loss Control Completely bridged casing

Partially bridged casing

Completely filled perforations

Partially filled perforations

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Squeeze Techniques

Squeeze Techniq ues

Placement Low Pressure

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High Pressure

Pumping Running

Hesitation

 Application Bradenhead

Squeeze Tools

LP Squeeze 

Applications

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Squeeze pressure below fracture

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Small slurry volumes (5 to 20 bbls)

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Special precautions (DO NOT EXCEED FRAC PRESSURE)

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HP Squeeze 

Applications

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Squeeze pressure above fracture

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Large slurry volumes

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Special precautions

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Running Squeeze 

Continuous pumping - like repairing a failed primary job,  thru 2 sets of perf.

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Final squeeze pressure attained

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Large slurry volumes (60 - 100 bbls)

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Low or high pressure squeeze

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Running Squeeze 

Continuous pumping

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Final squeeze pressure attained

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Large slurry volumes

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Low or high pressure squeeze

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   )    i   s   p    (   e   r   u   s   s   e   r    P

Time (min..)

Hesitation Squeeze 

Intermittent pumping

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Low pumprates

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High initial leak-off

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Small slurry volumes

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Long job times

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Hesitation Squeeze 

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Intermittent pumping

Low pumprates

High initial leak-off

   )    i   s   p    (   e   r   u   s   s   e   r    P

B C

 A 

Small slurry volumes

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Long job times

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Time (min..)

D

Bradenhead Squeeze 

Poor boy squeeze

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No downhole tools

BOP

50'

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Exposed casing and wellhead

CEMENT 10' Sand BRIDGE PLUG

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Job procedure

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Squeeze Tool Technique 

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Retrievable tools 

Positrieve Packer

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Hurricane Packer

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Shorty Squeeze Tool

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RBP

Drillable tools

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Cement Retainer

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Drillable Bridge Plug

Packer with tailpipe Squeeze 

Downhole Isolation tool Packer 

– Casing and wellhead protection

Tail Pipe

– Tailpipe for placement – Long intervals – Multiple setting of packer

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CEMENT

Packer without tailpipe Squeeze 

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Packer  

CEMENT 

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Cement Retainer Squeeze 

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CEMENT RETAINER CEMENT 10' Sand BRIDGE PLUG

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CT Squeeze 

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Applications 

Producing wells

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Through tubing

Advantages 

Cost

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Accurate placement

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Critical slurry design

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Job procedure

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Job Cycle Design 

Well conditions

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Slurry properties

Execution 

Slurry placement

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Surface pressures

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Equipment

Evaluation

20 Initials

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Final squeeze pressure

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Pressure test

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Inflow test

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Logs

Squeeze Calculations

Calculations Types 

Bradenhead squeeze

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Packer with tailpipe squeeze (Alu tail pipe tubing 2 7/8 - 6.4 lbs/ft)

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Packer without tailpipe squeeze

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Cement retainer squeeze- Most common / Safer

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Squeeze Calculations - Terminology 

Squeeze pressure 

Initial

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Final

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Maximum Allowable Surface Pressure ( MASP )

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Yield pressure

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Collapse pressure

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Bradenhead Squeeze Calculations 

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Determine the following: 

Volume of cement slurry and water ahead/behind

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No. of sacks, mixwater and additives

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Plug height with and without drillpipe or tubing

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Displacement volume to balance plug

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Maximum cumulative brine volume

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Hydrostatic pressure at start and end of squeeze

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Maximum Allowable Surface Pressure ( MASP )

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Surface pressure vs volume chart

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Internal yield and collapse pressure of tubing/casing

Packer-w/out-tailpipe Calculations Determine the following: 

Volume of cement slurry and water ahead/behind – – – –

No. of sacks, mixwater & additives Depth to set packer & when to close packer bypass Maximum displacement volume Displacement ,Hydrostatic pressures and MASP at the following stages:    

Cement slurry 1 bbl to end of tubing ( start squeeze ) Cement slurry starts to exit tubing All cement slurry out of tubing 1 bbl of cement slurry above T.O.P ( end squeeze )

– Surface pressure vs volume chart – Internal yield & collapse pressure of tbg/csg 25 Initials

Packer with tailpipe Calculations 

Determine the following – Volume of cement slurry & water ahead/behind – No. of sacks, mixwater & additives – Plug height with & without drillpipe or tubing – Length of tailpipe – Displacement volume to balance plug – Depth to set packer – Maximum cumulative brine volume – Hydrostatic pressure at start & end of squeeze – MASP – Surface pressure vs volume chart – Internal yield & collapse pressure of tbg/csg

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