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Squeeze CementingUTC
Module CF 2
Cementing Design, Execution and Evaluationfor Low Pressured Reservoir
Aug 24th 2005
1 Initials
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Squeeze?? Dowell? , Client?, or well ?
2 Initials
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Definition Injection of Cement Slurry
Perforations, Casing Leak,
Channels
Below or above fracture pressure
cement
nodes
casing
FORMATION
DEHYDRATED
CEMENTcement
slurry
tubing
packer
CHANNEL BEHIND
CASING
PRIMARY
CEMENT
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Applications
Primary cement job repair
Zonal Isolation
Zone Abandonment
Casing Leaks
Lost Circulation
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Basic Concept
Filtration Process
– Differential pressure applied
– Porous medium
– Filter cake deposition cement
nodes
casing PRIMARYCEMENT
FORMATION
DEHYDRATED
CEMENT
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Effect of Fluid Loss Control
Partially filled perforations
Completely filled perforations
Partially bridged casing
Completely bridged casing
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Squeeze Techniques
Low Pressure High Pressure
Placement
Running Hesitation
Pumping
Bradenhead Squeeze Tools
Application
Squeeze Techniques
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LP Squeeze
Applications
Squeeze pressure below fracture
Small slurry volumes (5 to 20 bbls)
Special precautions (DO NOT EXCEED FRACPRESSURE)
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HP Squeeze
Applications
Squeeze pressure above fracture
Large slurry volumes
Special precautions
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Running Squeeze Continuous pumping - like repairing a failed primary job,
thru 2 sets of perf.
Final squeeze pressure attained
Large slurry volumes (60 - 100 bbls)
Low or high pressure squeeze
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Running Squeeze Continuous pumping
Final squeeze
pressure attained
Large slurry volumes
Low or high pressure
squeeze Time (min..)
P
r e s s u r e
( p
s i )
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Hesitation Squeeze Intermittent pumping
Low pumprates
High initial leak-off
Small slurry volumes
Long job times
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Hesitation Squeeze Intermittent pumping
Low pumprates
High initial leak-off
Small slurry volumes
Long job times Time (min..)
P r e s s u r e
( p
s i )
A
B C D
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Bradenhead Squeeze
Poor boy squeeze
No downhole tools
Exposed casing and
wellhead
Job procedure
BRIDGE PLUG
10' Sand
CEMENT
BOP
50'
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Squeeze Tool Technique
Retrievable tools
Positrieve Packer Hurricane Packer
Shorty Squeeze Tool
RBP
Drillable tools
Cement Retainer Drillable Bridge Plug
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Packer with tailpipe Squeeze
Downhole Isolation tool
– Casing and wellheadprotection
– Tailpipe for placement
– Long intervals
– Multiple setting of packer
Packer
CEMENT
Tail Pipe
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Packer without tailpipe Squeeze
Downhole Isolation tool
Casing and wellheadprotection
Short intervals
No tailpipe
Suicide squeeze
Packer
CEMENT
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Cement Retainer Squeeze
Drillable Isolation Tool
Similar to packer without tailpipe
Applications
Squeeze pressure trapped
Job Procedure
BRIDGE PLUG
10' Sand
CEMENT
CEMENT
RETAINER
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CT Squeeze Applications
Producing wells
Through tubing
Advantages
Cost
Accurate placement
Critical slurry design
Job procedure
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Job Cycle
Design
Well conditions
Slurry properties
Execution
Slurry placement
Surface pressures
Equipment
Evaluation
Final squeeze pressure
Pressure test
Inflow test
Logs
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Squeeze Calculations
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Calculations Types
Bradenhead squeeze
Packer with tailpipe squeeze (Alu tail pipe tubing 2 7/8- 6.4 lbs/ft)
Packer without tailpipe squeeze
Cement retainer squeeze- Most common / Safer
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Squeeze Calculations - Terminology
Squeeze pressure
Initial
Final
Maximum Allowable Surface Pressure ( MASP )
Yield pressure
Collapse pressure
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Bradenhead Squeeze Calculations Determine the following:
Volume of cement slurry and water ahead/behind
No. of sacks, mixwater and additives
Plug height with and without drillpipe or tubing
Displacement volume to balance plug
Maximum cumulative brine volume
Hydrostatic pressure at start and end of squeeze
Maximum Allowable Surface Pressure ( MASP )
Surface pressure vs volume chart
Internal yield and collapse pressure of tubing/casing
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Packer-w/out-tailpipe CalculationsDetermine 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/csg25 Initials
P k i h il i C l l i
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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/csg26 Initials