SLB Squeeze Cementing

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Squeeze CementingUTC

Module CF 2

Cementing Design, Execution and Evaluationfor Low Pressured Reservoir

Aug 24th 2005

1 Initials



Squeeze?? Dowell? , Client?, or well ?

2 Initials



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

3 Initials



Applications

Primary cement job repair

Zonal Isolation

Zone Abandonment

Casing Leaks

Lost Circulation

4 Initials



Basic Concept

Filtration Process

– Differential pressure applied

– Porous medium

– Filter cake deposition cement

nodes

casing PRIMARYCEMENT

FORMATION

DEHYDRATED

CEMENT

5 Initials



Effect of Fluid Loss Control

Partially filled perforations

Completely filled perforations

Partially bridged casing

Completely bridged casing

6 Initials



Squeeze Techniques

Low Pressure High Pressure

Placement

Running Hesitation

Pumping

Bradenhead Squeeze Tools

Application

Squeeze Techniques

7 Initials



LP Squeeze

Applications

Squeeze pressure below fracture

Small slurry volumes (5 to 20 bbls)

Special precautions (DO NOT EXCEED FRACPRESSURE)

8 Initials



HP Squeeze

Applications

Squeeze pressure above fracture

Large slurry volumes

Special precautions

9 Initials



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

10 Initials



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 )

11 Initials



Hesitation Squeeze Intermittent pumping

Low pumprates

High initial leak-off

Small slurry volumes

Long job times

12 Initials



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

13 Initials



Bradenhead Squeeze

Poor boy squeeze

No downhole tools

Exposed casing and

wellhead

Job procedure

BRIDGE PLUG

10' Sand

CEMENT

BOP

50'

14 Initials



Squeeze Tool Technique

Retrievable tools

Positrieve Packer Hurricane Packer

Shorty Squeeze Tool

RBP

Drillable tools

Cement Retainer Drillable Bridge Plug

15 Initials



Packer with tailpipe Squeeze

Downhole Isolation tool

– Casing and wellheadprotection

– Tailpipe for placement

– Long intervals

– Multiple setting of packer

Packer

CEMENT

Tail Pipe

16 Initials



Packer without tailpipe Squeeze

Downhole Isolation tool

Casing and wellheadprotection

Short intervals

No tailpipe

Suicide squeeze

Packer

CEMENT

17 Initials



Cement Retainer Squeeze

Drillable Isolation Tool

Similar to packer without tailpipe

Applications

Squeeze pressure trapped

Job Procedure

BRIDGE PLUG

10' Sand

CEMENT

CEMENT

RETAINER

18 Initials



CT Squeeze Applications

Producing wells

Through tubing

Advantages

Cost

Accurate placement

Critical slurry design

Job procedure

19 Initials



Job Cycle

Design

Well conditions

Slurry properties

Execution

Slurry placement

Surface pressures

Equipment

Evaluation

Final squeeze pressure

Pressure test

Inflow test

Logs

20 Initials



Squeeze Calculations



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

22 Initials



Squeeze Calculations - Terminology

Squeeze pressure

Initial

Final

Maximum Allowable Surface Pressure ( MASP )

Yield pressure

Collapse pressure

23 Initials



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

24 Initials



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



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

Documents

SLB Squeeze Cementing