Drilling mud plays an vital role in balancing formation pressure, lubricating and cooling bit on drilling processing. Due to its high cost and severe pollution to local environment, circulation utilization of drilling mud has been adopt by most of drilling companies. But, when pumped from downhole, the drilling mud will carries massive solids that mainly consists of cuttings from crushed rocks and bentonite and barite added for better performance. What’ more, the solids-removal effect will exerts a direct influence on mud property and drilling safety. According the contribution to drilling mud,the solids can be classified as useful and unuseful particles which mainly contains drilling cuttings. Excessive massive solids will increase pressure more than formation pressure, and drilling mud will permeating into strata while fine particles will entry into oil channel which results in blockage causing damage of oil reservoir.
 

Drilling mud solids control system, or called drilling fluids circulation system is one the important composition in whole drilling rig system. Drilling mud solids control system used on a rig is designed to remove drilling solids from a drilling fluids system. It mainly consists of linear motion shale shaker, vacuum degasser,oilfield drilling fluids desander, oilfield drilling desilter, drilling fluids mud cleaner, and drilling centrifuge. All these solids control equipment serves as a series of sifter in varying shape and sizes, and drilling fluids system will be purified by repeatedly going through the layers of filters.

As such, the drilling mud solids control system has to be refined enough to leave desired solids behind while taking out drilling solids ranging in size from several millimeters to just a few microns. Although such perfect separation of desired from undesired solids is not possible, the advantages offered by the drilling mud solids control system far outweigh their limitations. Each devicesof drilling mud solids control system designed to remove a sufficient quantity and size range range of solids. The key to efficient drilling mud solids control system is to use the right combination of solids control equipment for particular situation,arrange the solids control equipment properly, and ensure that it operates correctly. This, in turn, requires accurate characterization of the drilling solids along with optimal engineering and maintenance of the drilling solids. Selecting, arranging and operating drilling mud solids control system to optimize the drilling fluids system cleaning process require accurate information about the intrinsic nature of the cuttings and solid additives.