Trenchless Technology

OCT 2018

Trenchless Technology is the premier communications vehicle for the trenchless industry. Through our multiple platforms, readers receive insights into the trenchless industry, as well as keep connected to the latest news, products and projects.

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70 T R E N C H L E S S T EC H N O LO GY O C TO B E R 2018 is the size of the screen openings, not the mesh count , that determines the size of the particles separated by the screen. It is because of this fact that HDD system users should compare and specify screens based on their API 13C RP designation as de•ined by the American Petroleum Institute. Hydrocyclones Hydrocyclones are simple mechan- ical devices that do not contain mov- ing parts and are designed to speed up the settling process. Feed pressure is transformed into centrifugal force inside the cone to accelerate particle settling in accordance with Stoke's law. Drilling mud enters the cyclone under pressure from a centrifugal pump. The velocity of the mud then causes the particles to rotate rapidly within the main chamber of the cone ( i .e. like a tornado in a bottle). Light , •ine solids and the liquid phase of the mud spiral inward and upward for discharge through the liquid out- let . Heavy, coarse solids tend to spiral outward and downward for discharge through the solids' outlet or under- •low. Hydrocyclones are important in a solids control system because of their ability to ef•iciently remove particles smaller than the •inest mesh screens. Centrifugal Pumps Another important aspect of a well - engineered solids control system is the use of centrifugal pumps. Centrif- ugal pump not only mix the mud to be pumped down the bore hole, but also provide the feed pressure and vol - ume required to operate the hydrocy- clones. Maintenance of these pumps is essential to the operation of your solids control equipment . Decanter Centrifuges Centrifuges are another essential part of any effective solids control sys- tem. They have a great advantage of achieving extremely •ine cut points. The rotating speed is transformed into centrifugal force inside the rotat- ing assembly to accelerate particle set- tling in accordance with Stoke's law. Essentially, a centrifuge acts as a small settling pit which alloys rapid settling of solids under controlled conditions. In order to achieve effect ive solids control there are several steps that should be taken . The •irst and most crit ical step is to obtain an effect ive, dependable and durable solids con - trol system . Special attent ion should

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