Drilling fluid solids treatment

Initially, it is necessary to look into composition characteristics of solids in drilling fluid and its influence on well drilling, so as to remove harmful solids economically and effectively for further recycling. Solids generated in drilling process mainly include mixing clay, weighting substance, cuttings and other solid substance. They are divided into clay, cuttings, weighting substance and solid substance in treating agent according to their sources in drilling fluid. According to the modes of action of them and their ions in water, low density solids further fall into active solids and inert solids. Active solids are easily hydrated and can react with other substances in liquid. This kind of solids has high surface activity and specific surface area with relatively active electroche

Cuttings are major harmful solids in drilling fluid and affect physical properties of drilling fluid during the whole drilling process, increasing density, viscosity, yield point, water loss, mud cake, abrasiveness, glutinousness and flow resistance of drilling fluid. During drilling process, cuttings may even damage oil and gas reservoirs, reduce ROP, increase rotary table torque and cause blockage during tripping, even resulting in lost circulation, blowout and other complex downhole problems. Besides, cuttings in drilling fluid seriously abrade the circulating system. The key point for achieving drilling fluid recycling is to effectively treat the harmful solids contained within. Solids control system can effectively achieve such a goal. In the system, shale shaker can remove harmful so