TornadoSM Process

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TornadoSM Process

• BJ Services Company

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Sand Cleanout Operations

• One of the most common CT services performed
• many well issues impacting operational success
• BHP / completion details / hole angle / sand
  properties / etc
• many design options available with CT
• liquid / water / gel / nitrified fluid / foam /
  nitrogen / etc
• conventional circulation / reversing / concentric
  CT / etc
• effective solution needed for large, deviated
  completions ...

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Issues

• Flow profile disruption is extreme in the
  eccentric annulus formed by the CT lying on the
  low side of the hole
• Fluid shear is highest at the pipe walls
• Particle suspension in many low friction polymer
  systems is poor except at very low shear rates
• In deviated wells particles settle quickly to
  low side of hole

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Conventional Cleanout Process
Sand
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Conventional Cleanout Process
Sand
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Conventional Cleanout Process
Equilibrium Sand Bed
Fluidized Sand
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Conventional Cleanout Process
Equilibrium Sand Bed
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Conventional Cleanout Process
Remaining Sand
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Solids Transport Research
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Solids Transport Research
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Solids Transport Research
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Computer Model Development

• Tornado ProSM Software
• integrated into CIRCA
• identifying cleanout performance based on

• hole / annulus geometry
• fluid properties
• insitu fluid velocities
• gas volume fractions
• hole angle
• solids properties
• time
• etc

• Calculations of sand bedding profile sand
  volume removed

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CLEANOUT EXAMPLE 1
7 Casing

• 250 ft of fill (ie 10 bbls)
• cleanout using 1 1/4 CT
• pumping light Xanthan gel at 1.5 bpm

60 Deviation
2 7/8 Tubing landed 300 ft above TD

• RESULTS
• At equilibrium the volume of the sand bed is
  2.9 bbls

• 29 of sand remaining after cleanout

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CLEANOUT EXAMPLE 2
7 Casing

• Same well as Ex 1 but with the tubing 500 ft
  higher up the well
• 250 ft of fill (ie 10 bbls)
• cleanout using 1 1/4 CT
• pumping light Xanthan gel at 1.5 bpm

60 Deviation
2 7/8 Tubing landed 800 ft above TD

• RESULTS
• At equlibrium the volume of the sand bed is
  8.0 bbls

• 80 of sand remaining after cleanout

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CLEANOUT EXAMPLE 2a
7 Casing

• Same well as Ex 1 but with the tubing 500 ft
  higher up the well
• 250 ft of fill (ie 10 bbls)

60 Deviation

• cleanout using 1 1/2 CT
• pumping light Xanthan gel at 2.0 bpm

2 7/8 Tubing landed 800 ft above TD

• RESULTS
• At equlibrium the volume of the sand bed is
  4.7 bbls

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CLEANOUT EXAMPLE 2a
7 Casing

• Same well as Ex 1 but with the tubing 500 ft
  higher up the well
• 250 ft of fill (ie 10 bbls)
• cleanout using 1 1/2 CT

60 Deviation

• Increase rate to 2.5 bpm (CT remains stationary)

2 7/8 Tubing landed 800 ft above TD
RESULTS

• 0 of sand remaining
• but
• 700 bbls of fluid used
• 5 hours cleaning time

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How Can We Improve?

• A different cleanout methodology
• avoiding large diameter CT
• avoiding large volumes of fluid
• easy to follow field procedures

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Downhole Switchable Jetting

• TornadoSM Nozzle
• downhole switchable forward / reverse jetting
• single trip hole sweeping capabilities
• control pull out of hole speed to attain near
  100 cleanout performance in difficult wellbores
  ...

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TornadoSM Nozzle
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TornadoSM Nozzle Cleanout Process
Forward Cleaning Mode
Sand
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TornadoSM Nozzle Cleanout Process
Forward Cleaning Mode
Sand
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TornadoSM Nozzle Cleanout Process
Forward Cleaning Mode
Equilibrium Sand Bed
Fluidized Sand
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TornadoSM Nozzle Cleanout Process
Backward Cleaning Mode
Equilibrium Sand Bed
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TornadoSM Nozzle Cleanout Process
Backward Cleaning Mode
Equilibrium Sand Bed
Eroding Sand Bed
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TornadoSM Nozzle Cleanout Process
Backward Cleaning Mode
Eroding Sand Bed
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TornadoSM Nozzle Cleanout Process
Backward Cleaning Mode
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Wiper Trip Efficiency
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First Gulf of Mexico Jobs

• Cleaned Out 2 wells in Eugene Island 109
• 1st Well
• 10,000 ft, 2 7/8 tubing, 7 5/8 casing, 60º
• Cleaned with 2 KCl _at_ 1.8 bpm
• 2nd Well
• 7,000 ft, 2 3/8 tubing, 7 5/8 casing, 19º
• Cleaned with 2 KCL _at_ 1.4 bpm 300 scf/min N2
• Both cleanouts completely successful

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Results

• accurate analysis of cleaning performance
• interpretation of sand bedding conditions
• effective and accurate solution for single pass
  hole sweeping
• GETTING ALL OF THE SAND OUT

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Thank You!Questions?
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