WELLBORE CLEANOUTDEBRIS TYPE CHARTS & TOOL STRING

DEBRIS TYPE CHART

SOLIDS SLURRIES/GUNK (VISCOUS LIQUIDS) JUNK/RISKS

SOURCE SOURCE SOURCETYPE TYPE TYPE

Silt from productionSand from production

Mud settlement

Installation of completions

Mil l ing fluid/ synthetic muds gelled oil based mud after mixing with water

BOP stack/DHSV seals/plug seals

After dri l l out

Poor hole cleaning Production fluids(highly well specific)

Perforation charges

Introduced tubulars in to the well

Mil l ing operations

Poorly prepared tubulars

Dropped objects

Brine, formation

Water formation

Various sediments Pipe dope Seals/elastomericmaerials

Barite Viscous muds Cement plugs/float equipment

Proppants Swarf

Salt

Scale

Cement cuttings Asphaltenes/ Black sticky stuff

Perforation debris

Mil led scale rust Accidentally introduced materals

DEBRIS TYPE CHART

SCALE

ASPHALTENE WAXES BSS

SCALE

HYDRATES SWARF

SAND DEPOSIT ON SLIDING SLEEVE

SIMULATED PRODUCED &FRACTURED DEBRIS

SCALE SCALE

* Debris type images (for illustration purposes) taken from various web sources.

APPLICATION TYPE

TYPE 1 TYPE 2 TYPE3 TYPE 4 TYPE 5

Layer debris on tubing wall .Access requirement for wellbore/

completion targets.

Vertical Debris Deposits, partial blockage.

*Partial blockage

*Full blockage

Vertical Debris Deposits.

Horizontal Debris Deposits

Vertical Debris Deposits.

Horizontal Debris Deposits

Nipple profi les/tubing OD changes

Screens

Slidingsleeves

PerfsValves, plugs,fish necks

Valves, plugs,fish necks

Swarf, rubber,nuts & boltsGas l ift/side pocket

mandrels

Vertical Debris Deposits.

Horizontal Debris Deposits

Vertical Debris Deposits.

Ful lbore. Access requirement wellbore/

completion targets.

Same as 1 & 2.Access requirement to a wider bore

beneath a narrower restriction.

Remove debris, clean inside fishneck for plug retrieval.

Junk/on top of or in-debris.Rubber/metal swarf/nuts/bolts.

*Partial, low-side/bridges *Gas lift/side pocket mandrels *Low-side, bridges

WELLBORE CLEANOUTTOOL STRING

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