oil well and drilling rig

Pexoseal 551

Copolymer latex for aqueous drilling fluids

Chemistry Type: Styrene butadiene copolymer (SB)

Function(s): Drilling Fluid Additives, Fluid Loss Control Additives

Pexoseal 551 provides fluid loss control and wellbore stability for high performance water-based drilling fluids in fresh or salt water with application temperature range up to 160 °C (320 °F). It plugs pores to reduce filtercake permeability, and offers a high tolerance to salts and multivalent ions.

Previously sold as GenCeal DF 8100.

Key Advantages

  • Organic colloidal micro-particles, deformable and compressible, to reduce non-productive time, improving wellbore stability
  • High tolerance to salts and multivalent ions
  • Plugs pores to reduce permeability of filtercake
  • Can impart fluid loss control and acts as a sealing additive for wellbore stability
  • Over time, the emulsion can form a film in the filtercake at high temperatures, strengthening the wellbore
Physical Form
Average Particle Size
210 ± 20 nm
Brookfield Viscosity
< 250 mPa·s (LVT #2 spindle @ 60 rpm, room temperature)
Specific Gravity
1.01 @ room temperature (RT)
Solids (by weight)
39 - 43 %
7.5 - 10.0
Mechanical Stability

Product Availability

North America, Latin America, China, Asia (excl. China, incl. India), South Pacific, EMEA (Europe, Middle East, Africa)

Contact Us for individual country availability.

Related Documents & Downloads

OMNOVA Chemical Technical Data Sheet
OMNOVA Chemical Regulatory Data Sheet
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