There are many challenges when drilling an oil or gas well. One major challenge is reducing and eliminating losses. A key factor for casing design is to take into account all the varying pressure zones at different intervals, ranging from low to high-pressure zones, which is a commonly encountered issue for well operators. The mud weight of the drilling fluid will be adjusted to balance the pressure as new pressure zones are found. The mud weight used to balance the high-pressure zones will affect the low-pressure zones as well, often resulting in fluid invasion. The fluid invasion occurrence could fracture the zone, damaging the formation resulting in severe down-hole losses and stuck pipe. This is primarily due to differential sticking, which is created by the varying high and low pressure zones encountered.
Liquid Casing® products are used to effectively drill through otherwise troublesome shale sections. When drilling through troublesome shale sections, it is common that inhibition is reduced through the incorporation of suitable shale inhibitors. Through the use of proper inhibitive mud systems, the pressure is managed by adopting a suitable mud weight. However, the shale has micro fractures and voids. This is due to the pore throats of different shapes and sizes in the shale lattice, resulting in predominantly fractured shale. These micro-fractures or voids must be properly reinforced to seal the pores and stabilize the shale. Unless stabilized, sloughing shale will result. Conventional additives fail to plug the pore throats effectively. However, Liquid Casing® products are engineered to mechanically plug the pore throats through its design, manufacturing process, and application.
Liquid Casing® products have a proven worldwide track record for preventing and reducing losses at a level of performance unmatched by our competitors.