FILTERATION CONTROL

PDT-STARCH

A modified and bacterially stabilized potato starch, provides filtration control with minimum viscosity build-up in water-based drilling fluids. Through its coating mechanism, PDT-STARCH reduces dispersion of clay particles and stabilizes reactive formations. PDT-STARCH exhibits excellent stability against bacterial fermentation and contains no toxic preservatives.

  • Lower filtration rates in most water-based drilling fluid systems
  • Control filtration in fresh-water or electrolyte-based drilling fluid systems at temperatures up to 300 F (149C)
  • Provide filtration control of muds used in environmentally-sensitive areas.
  • Improve borehole stability
  • Flocculate dispersed drill cuttings in clear water drilling
  • Effective in freshwater, seawater, saltwater, and saturated saltwater drilling fluids

Advantages:

  • Maintains filtration control without detrimental viscosity increase
  • Effective with fast drilling non-dispersed systems
  • Decreases clay dispersion
  • Rarely require a biocide and hardly ferment
  • Can be used efficiently in gypsum-treated and lime systems
  • Maintains filtration control when contaminated by brine water flows, salt, gypsum, anhydrite, cement, or other contaminants

PDT-STARCH-HT

PDT-STARCH-HT is a specially processed, stabilized non-ionic starch derivation that controls high pressure-high temperature filtrate loss at temperatures up to 250F (121C) and enhances the low shear rate viscosity of a fluid containing xanthan gum biopolymer.

This unique polymer combination is synergistic and yields improved static suspension. Fluid compositions mixed with PDT-STARCH-HT can be used to drill into pay zones and underream. It can also be used as pre and post gravel pack fluid and as lost circulation pills.

PDT-STARCH-HT, when used with properly sized bridging/weighting particles, can:

  • Provide filtration control
  • Minimize damage to the productive formation

Advantages:

  • Suitable for all water-based drilling fluids, workover and completions fluids including:
    • sea water, potassium chloride, magnesium chloride, sodium chloride, sodium bromide, calcium bromide, and zinc bromide.
  • Resists calcium contamination over a wide pH range
  • Soluble in acids and oxidizers
  • Cleans up readily following drilling, workover, or completion operations
  • Environmentally responsible, presenting no toxicity or ecological problems

PDT-STARCH-HV

Pregelatinized corn starch, provides filtration control in water-based drilling fluids. PDT-STARCH-HV is stable in saline drilling fluids that contain small amounts of divalent ions. Fluid-loss control and rheology stabilizer for saturated saltwater, lime and freshwater muds.

PDT-STARCH-HV can be used to reduce fluid loss in most water-based drilling fluids.

Advantages:

  • Stable at temperatures up to 250EF (121EC)
  • Effective in lime- and gypsum-based systems
  • More cost-effective than other polymeric filtration control agents

PDT-PAC-R

PDT-PAC-R, a high molecular weight polyanionic cellulose, provides filtration control and supplementary viscosity in most water-based drilling fluids.

  • Control filtration rates
  • Retard shale swelling and disintegration
  • Provide supplementary viscosity in freshwater, seawater, and brine-based fluids

Advantages:

  • Effective in freshwater, saltwater, and brine-based fluids
  • Effective in small concentrations for viscosity and filtration control
  • Stable at temperatures up to 300EF (149C)
  • Effective in moderate to high pH systems
  • Nontoxic
  • Minimum bactericide requirements

PDT-PAC-L

PDT-PAC-L, polyanionic cellulose, provides filtration control in most water-based drilling fluids. PDT-PAC-L can also be used as a thinner in seawater and brine-based fluids in small concentrations.

  • Control filtration rates without significantly increasing fluid viscosity
  • Encapsulate shale to prevent swelling and disintegration

Advantages:

    • Effective in freshwater, saltwater, and brine-based drilling fluids
    • Effective in small concentrations for filtration control
    • Stable at temperatures up to 300F (149C)
    • Effective in moderate to high pH systems
    • Minimum bactericide requirements
    • Nontoxic