A Highly Resilient Borehole Wall Strengthening Plugging Agent

Borehole wall stability is a prerequisite for safe and smooth drilling, and also a key point and a difficult problem worth attention in drilling operation. Elastic graphite, because of its unique resilience, has unparalleled advantages in strengthening and plugging borehole walls. PF-RG is an elastic graphite borehole wall strengthening plugging agent produced independently in China. It is completely inert, nonmagnetic and high temperature resistant. It can be used both in water base drilling fluids and oil base drilling fluids, without affecting their rheology property. It reduces the friction coefficient of drilling fluids. Drilling fluids treated with PF-RG have their filtration rate greatly reduced. High pressure elasticity test results showed that PF-RG has very high resilience, with its rate of resilience greater than 20% to 100%, the maximum, equivalent to similar products produced abroad. PF-RG has been successfully used in field operations, proved that its good pressure bearing capacity has been accepted by those who have used PF-RG.