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:
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Stabilizes shales.
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Lowers torque and drag.
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Reduces high‐temperature fluid loss.
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Produces thin‐walled filtercakes.
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Improves bore hole stability.