poly-plus - product bulletin

Product Bulletin

POLY-PLUST POLY-PLUS polymer is a high-molecular-weight, anionic liquiddesigned to provide cuttings encapsulation and shale stabilization.POLY-PLUS also acts as a viscosifier, friction reducer and flocculantwhile providing some fluid-loss control. POLY-PLUS can be used inmud systems ranging from low-solids to weighted, utilizingmakeup waters from fresh to saltwater.

Physical appearance . . . . . . . . . . . . Cream-colored, opaque liquidOdor . . . . . . . . . . . . . . . . . . . . . . . . Slightly hydrocarbonSpecific gravity . . . . . . . . . . . . . . . . 1.07 – 1.10pH (1% solution) . . . . . . . . . . . . . . 8 – 9Flash point . . . . . . . . . . . . . . . . . . . >200°F (93.3°C) (PMCC) Pour point . . . . . . . . . . . . . . . . . . . -20°F (-28.9°C)Viscosity (typical) . . . . . . . . . . . . . . ~500 cp

TYPICAL PHYSICALPROPERTIES

APPLICATIONSPOLY-PLUS polymer mud systems.POLY-PLUS provides excellent cut-tings encapsulation and improvedwellbore stability. Typical concen-trations of POLY-PLUS are 0.75 to 3 lb/bbl (2.1 to 8.5 kg/m3). It is alsoeffective in salt muds, such as KCl-or NaCl-enhanced fluids, althoughslightly higher concentrations ofPOLY-PLUS may be required.

Clear-water fluids. POLY-PLUS maybe used in clear-water, solids-free

drilling fluids. POLY-PLUS increases vis-cosity and enhances solids removalby flocculating the undesired solids. Italso provides cuttings encapsulationand improved wellbore stability. Thissystem is frequently used in slimholecontinuous-coring applications. Theaddition of 0.5 to 1.75 lb/bbl (1.4 to5 kg/m3) enhances solids removal byflocculating solids.

POLY-PLUS

Product Bulletin of 4

Concentration* Equivalentslb/bbl (kg/m3) gal/bbl (l/m3)

0.50 (1.4) 0.056 (1.3)0.75 (2.1) 0.084 (2.0)1.00 (3.0) 0.110 (2.6)1.50 (4.3) 0.170 (4.0)

*Based on 30% active material

POLY-PLUS may be mixed directly intothe active mud system or premixedat higher concentrations in a sepa-rate pit or chemical barrel, thenblended into the active system. Itcan be poured directly into the pitsat any point where good agitationexists such as over a mixer, or addedthrough the mixing hopper orchemical barrel. A small, steadystream of POLY-PLUS injected into

the flowline will provide selectiveflocculation of drill solids. Causticand lime should not be mixed at the same time as POLY-PLUS.

Sweeps may be accomplished by mixing POLY-PLUS directly in the active system at the suction pit or by pouring 3 to 4 qt (2.8 to3.8 L) directly into the drillstringduring connections.

Low-Solids, Non-Dispersed(LSND) muds. POLY-PLUS is wellsuited to LSND systems. In reduced-bentonite muds, POLY-PLUS serves as a bentonite extender to increase vis-cosity, flocculates drill solids for moreefficient removal, encapsulates cut-tings and improves wellbore stability.

Weighted muds. POLY-PLUS can beused in weighted muds for cuttingsencapsulation, improved wellbore

stability, secondary viscosity and toimprove filter cake integrity. Theeffectiveness of the polymer isreduced as the concentration oforganic, anionic dispersants increases.

POLY-PLUS sweeps. Viscous POLY-PLUS

sweeps are effective for periodic holecleaning. Circulating such a sweepthrough the well helps clear accu-mulated cuttings and maintain aclean hole.

METHOD OF ADDITION

APPLICATIONS (CONTINUED)

CONTAMINATIONPOLY-PLUS reacts with multivalentcations such as calcium. In con-centrations greater than 300 mg/L,calcium causes the polymer to pre-cipitate. Use soda ash to removecalcium concentrations above 300 mg/L.

Treat cement contamination tokeep the calcium and pH as low aspossible. Use sodium bicarbonate

along with a pH-reducing productsuch as lignite to treat cementcontamination.

Zinc oxide is recommended ifhydrogen sulfide gas is encoun-tered. Zinc oxide is preferred to liq-uid products containing zinc. Dueto lower solubility, zinc oxide doesnot react with POLY-PLUS as readilyas liquid products that contain zinc.

POLY-PLUS


Typical Properties of POLY-PLUS in FreshwaterConcentration PV YP Marsh Funnel(lb/bbl [kg/m3]) (cp) (lb/100 ft2) (sec/qt)

0.50 (1.4) 2 2 35 0.75 (2.1) 3 3 37 1.00 (2.9) 4 4 39 1.50 (4.3) 8 8 43

ADVANTAGES• Provides excellent cuttings

encapsulation and limits cuttings dispersion.

• Provides improved shalestabilization.

• Enhances the removal of drill solids.• Aids in preventing balling on

the bit, stabilizers and bottom-hole assembly by coating andlubricating solids.

• Liquid product for easy mixingand rapid yield.

• Improves the lubricity of mostmud systems, particularly non-dispersed muds, when used incombination with a lubricant.

• Low pour point of -20°F (-28.9°C)for easy use in cold climates.

• Can be used to viscosify clear-water and low-solids drilling fluids.

LIMITATIONSThe following limitations apply toall acrylamide/acrylate copolymers:• During initial treatment with

POLY-PLUS in a non-dispersed mudsystem, severe flocculation mayoccur, causing high viscosity untilall of the solids are coated. POLY-PLUS

polymer mud systems utilize lowconcentrations (<15 lb/bbl or <43 kg/m3) of M-I GELT to reducethis interaction. Continued addi-tions of POLY-PLUS result in a stablesystem with the desired rheology.

• POLY-PLUS is calcium-sensitive andbegins to precipitate when thecalcium concentration exceeds300 mg/L.

• POLY-PLUS is pH-sensitive, with anoptimum range of 8.5 to 10.5. AtpH levels above this range, hydrol-ysis may convert polyacrylamideinto polyacrylate and releaseammonia (NH3).

• POLY-PLUS is temperature-stable toapproximately 350°F (176.7°C)although the copolymer maybegin to hydrolyze into polyacry-late when exposed to prolongedtemperatures above 275°F (135°C)and release ammonia (NH3).

• POLY-PLUS is subject to sheardegradation of its viscosity andmay eventually lose the ability toviscosify, but cuttings encapsula-tion and shale stabilization willnot be affected.

POLY-PLUS


©1999 M-I L.L.C. All rights reserved. ®POLY-PLUS and M-I GEL are registered trademarks of M-I L.L.C.

MI-11610 2M 8/99 Litho in U.S.A.

POLY-PLUS


TOXICITY AND HANDLING

Bioassay information is availableupon request. POLY-PLUS containsmineral oil and may not beacceptable for certain applications.

Handle as an industrial chemical,wearing protective equipment and observing the precautions asdescribed on the Transportation andMaterial Safety Data Sheet (MSDS).

Small spills should be wiped upwith disposable towels or cleanedup with an absorbent material suchas sawdust or rig sweep. UndilutedPOLY-PLUS should not be washeddown with water.

PACKAGING AND STORAGE

POLY-PLUS is packaged in 5-gal (18.9-L), plastic cans.

Keep containers sealed and donot allow water to contaminate

POLY-PLUS containers. Store in awell-ventilated area away fromsources of heat or ignition.

A Smith/Schlumberger Company

P.O. Box 721110Houston, Texas 77272-1110Tel: 281·561·1300Fax: 281·561·7240www.midf.comE-mail: [email protected]

This information is supplied solely for informational purposes and M-I L.L.C. makes no guar-antees or warranties, either expressed or implied, with respect to the accuracy and use ofthis data. All product warranties and guarantees shall be governed by the Standard Terms of Sale.

poly-plus - product bulletin

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