Use of Zeta Potential to Maximize Sand Free Rate: A New Approach on SandControl

摘要

There are several active and passive methods for controlling the production of formation sand. The main objective is toproduce at the maximum sand-free rate without compromising the well's hydrocarbon production and longevity of thecompletion system placed. This paper presents a new chemical method and the latest case histories from offshore reservoirs.The new method changes the zeta potential of solid surfaces, thus strengthening attraction between the particles to optimallyalign proppant, sand particles, fines, or coal fines. Laboratory tests are presented, showing the mechanism of zeta potential andlab tests performed on unconsolidated cores by internal and independent labs. Core flood tests consisted of measuring thepermeability before and after the treatment and the formation sand retention. More than 100 jobs have been treated with thischemical solution, with positive and promising results. Operational procedures and recommendations are presented on severalwells treated.