一种高回弹性井壁承压封堵剂

井壁稳定是保证钻井施工安全顺利的前提，也是钻井作业关注的重点和难点。弹性石墨因为其独有的回弹特性，在井壁增强和封堵承压方面具有其它封堵材料无可取代的优势。井壁承压封堵剂PF-RG是国内自主生产的弹性石墨材料，具有完全惰性、无磁性、高抗温性等优良性能，在水基钻井液和油基钻井液有良好的适应性，不影响流变性，降低润滑系数的同时大幅度降低滤失量。经过压弹性实验评价，该材料具有非常高的回弹特性，回弹率超过20%，最高达到100%以上，与国外同类产品相媲美。目前井壁承压封堵剂PF-RG已经在现场作业中成功应用，证明了该材料具有优良的承压封堵能力。

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.