On-line Drilling Cuttings is generated from the whole drilling process. The cuttings will be carried out by drilling fluids, and then separated by solids control / waste management systems. The first stage separating equipment is shale shaker. After shaker separation, the fine cuttings will drop down to under tank with drilling fluids, and the coarse cuttings will be separated and treated by vertical cutting dryer.
The main function of vertical dryer is to recover the useful oil based mud, reduce the oil content on cuttings (OOC) and reduce the total volume of cuttings which will be finally treated by Thermal Desorption Unit. The recovered oil based mud will be returned to active mud system. Some conditions, the operator will adopt High G dryer or high G shaker to replace the Vertical dryer to achieve same functions. Even, the performance of High G dryer is not as good as Vertical dryer, the oil on cuttings will be around 10% after high G dryer, but all choices is depends on the owner’s requirements.
The Vertical dryer can be used for both onshore drilling and offshore drilling operations. Vertical cutting dryer with DNV2.7-1 Certificate SKID is available specialized for offshore drilling activities. Except for DNV certificate, offshore platform have much higher request on paintings because of the corrosive atmosphere with high salt content. We adopt marine anti-corrosive paintings with 3layers for much better performance.
Technical Parameters of Vertical Dryer
|Max. Treating capacity (ton/h)||30-50||30-50|
|Drying efficiency||OOC≤ 5%||OOC≤ 5%|
|Screen opening size(mm)||0.2/0.3/0.5||0.2/0.3/0.5|
|Screen rotation speed(rpm)||900||0~900 VFD|
|Separation G force (max)||420G||420G|
|Oil Pump Motor(kw)||0.55||0.55|
|Oil Tank Capacity (L)||48||48|
|Air Knife Pressure(Mpa)||0.69||0.69|
|Air Knife Flow (m3/min)||1.8||1.8|
Technical Features of Vertical Dryer
420G High G force under 900 rpm regular operation speed
750G High G force under 1200 rpm higher operation speed for option
Vertical dryer can be started with fixed speed control or VFD control
Main electrical components sourced from international brand: SIEMENS, Schneider or ABB
The Ex-proof standard normally comply with China Standard EXDIIBT4, IEC/ATEX for option
The main bearings are Spherical Roller Bearings, source from FAG Brand
The Flights on the rotor is hard facing to HRC 65, with longer lifetime
The Flights and the rotor assembly are individually balanced for easy replacement
The screen basket material is Stainless Steel 316L, better performance in ani-corrosion
The screen basket is processed in high precision and dynamic balance to ensure better balance and easy replacement
Equipped with high pressure air cutter to clean the high viscosity mud sticking on the screen basket
Equipped with water jetting system to work together with air cutter, to avoid screen block
Individual oil lubrication system with low pressure automatic alarm.
Dryer motor and oil system motor is interlocked, the dryer can be started only after starting the oil pump
Cutting dryer with DNV2.7-1 Certificate SKID is available specialized for offshore drilling activities.