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DX PHPA
Viscosifier/Shale Stabilizer


Description

DX PHPA drilling fluid additive is designed to be extremely effective in stabilizing sloughing shales, providing viscosity and filtration control, and producing reduced torque and drag in fresh water and KCl drilling fluids. High viscosity is achieved with low polymer concentrations.
Typical

Appearance

 White free flowing powder
Properties Charge 30% Anionic
Molecular Weight >15 Million
pH, 0.5% solution 7.0
Advantages Enhances drilling fluid viscosity. Protects water sensitive sloughing shales. Minimizes problems near the well bore. Reduces torque and drag. Reduces or eliminates bit balling.
Solids Control As with any fluid, drilled solids content should be kept to a minimum. Initial breakover to the system with DX PHPA may blind the shaker screens due to initial high viscosities. Once the polymer fluid is sheared, screen blinding problems are minimal. Usually 1-2 circulations are required.
 
Rheology

To achieve good hole cleaning and fluid shear-thinning properties, maintain a PV:YP ratio of 1:1 to 1:2. If additional viscosity is desired, use 0.75 lb/bbl of polymer. Also 4-6 lb/bbl of pre-hydrated bentonite can be added to supplement to viscosity but the viscosity will build as drilled solids are incorporated into the system. Attention is focused on effective solids control, polymer concentrations and proper additions of KCl.

Thermal Stability DX PHPA polymer is thermally stable to 300°F (150°C) and has used successfully in wells with bottom hole temperatures in excess of 350°F (175°C). DX PHPA should be added to the system very slowly, with a funnel, at a rate of 30-45 minutes per bag.

Treatment of
Contaminants

  1. Maintain calcium ion concentration (Ca+2) below 400 ppm with soda ash, but leave 100 ppm Ca+2 in the system to prevent CO2 ion-blocking polymer absorption on the shale. Use lime with discretion to maintain Ca+2 in system.
  2. Dump excessive green cement into the reserve pit.
  3. Never add phosphates to the system as this will have an effect similar to that of a strong thinner such as chrome lignosulfonate.
  4. Do not use chrome or zinc compounds in the system.
  5. Control hydrogen sulfide (H2S) by increasing mud weight and adding zinc carbonate.
 
DX Oilfield Products, Inc., 300 Jackson Hill, Houston, TX 77007
 

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Revised: December 04, 2002