Drilling fluids performs essential functions during oil & gas well construction such as transporting cuttings to the surface, preventing well-control issues and wellbore stability, minimizing formation damage, cooling and lubricating the drilling rig and providing information about the wellbore. However, cuttings are obviously created during the drilling operations, and they will pose safety hazards and reduce drilling efficiency. That is the theoretical foundation that drilling fluids purification is based upon. Both the oilfield solids control system and related equipment are involved to conduct this operation.

1. The recommended installation order of unweighted mud solids control system is: drilling fluids shale shaker, mud desander, desilter, and oilfield drilling decanter centrifuge, by which the undesirable solids will be removed in descending sequence. The selection of drilling fluids solids control equipment for different levels should depend on mud density, solids' type and content, rheological property and rated capacity of each oilfield solids control equipment. Other than decanter centrifuge, the capacity of the other solids control equipment should not be less than 1.25 times of maximum capacity of drilling mud centrifugal pumps.
 

2. Closed drilling fluids solids control system: the closed solids control system is an integrated unit all of whose solids control equipment related are installed in the tank to conduct a closed recycling treatment of drilling mud. The closed solids control system is consisted of two oilfield shale shakers with fine mesh, a desander and a normal shale shaker; decanter centrifuges installed downstream from two drilling mud cleaners and a set of mud tanks having pores inter-communicated with each other, which contain three main tanks, two storage tanks and a spare tank. This solids control system is characteristic of the following advantages: large capacity for all kinds of unweighted mud, capabilty of maintaining the property of drilling mud, effectiveness in solids-removal and zero-emission of drilling mud avoiding environmental pollution.

3. Oilfield decanter centrifuge can be replaced by micro-hydrocyclones or assisted with a micro-hydrocyclone before it to make the operation more efficient and avoid massive loss of mud simultaneously.

As a leader in China’s solids control industry and an expert at drilling waste management, KOSUN is capable of providing customers with such four series as oil & gas drilling solids control equipment, centrifuges, drilling waste treatment equipment and drilling security equipment, including 25 categories of products, and can also customize packaged design and matching products of oil & gas drilling rigs for drilling contractors. The products provided by KOSUN are extensively used in oil & gas drilling and workover, coalbed methane drilling, shale gas drilling, water well, geothermal well drilling, trenchless horizontal directional crossing projects, mine gravel staged treatment, tailings treatment, rive dredging works, municipal environment-friendly sewage treatment, industrial wastewater treatment, fruit juice purification, waste oil recovery and purification treatment, etc.