Ven-Fyber 201™ is the Original micronized, surface-modified, cellulose fiber derivative for use as a drilling fluid additive. Ven-Fyber 201™ is a premium blend of micronized, surface-modified organic fibers for the prevention and remediation of seepage loss in drilling fluid applications. Ven-Fyber 201™ has been engineered to seal the low pressure, depleted sands and micro-fractured shales encountered during drilling, work-over and completion operations.