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RXSOL ORG -15 (Asphasol) shale inhibitor is a partially water soluble, water dispersible blend, containing sulfonated organic resins for water-base muds. It aids in stabilizing shale sections, controlling solids dispersion and improving wall cake characteristics. Being partially soluble, RXSOL ORG -15 (Asphasol) has the capability of plugging micro-fractured shales and sealing shales so that the hydrostatic overbalance from the fluid column is not transmitted to the pore pressure network of shale formations adjacent to the wellbore.
Advantages:
- Increases wellbore stability.
- Plugs micro-fractures and seals shales.
- Inhibits swelling and water wetting of shales.
- Reduces High-Temperature, High-Pressure (HTHP) fluid loss.
- Reduces torque and drag.
- Improves filter cake quality.
RXSOL ORG -15 (Asphasol) can be used in most water base muds. It is a free-flowing powder and can be added directly to the mud system through the mixing hopper. Unlike other shale control additives, it is not necessary to premix Rxsol ORG -15 (Asphasol) with oil and it contains no surfactants. Normal concentrations of Rxsol ORG -15 (Asphasol) range from 4 to 10 lb/bbl (11.4 to 28.5 kg/m3) for most applications.
In water‐base drilling fluid systems, Rxsol ORG -15 (Asphasol) inhibitor exhibits the following characteristics:
- Stabilizes shales.
- Lowers torque and drag.
- Reduces high‐temperature fluid loss.
- Produces thin‐walled filtercakes.
- Improves bore hole stability.
