Oil sludge treatment, oil base mud and drill cuttings treatment is the major product made by GN Solids Control. Some clients do not know the difference of Oil sludge treatment system and oil base cuttings treatment system. They want to know the difference and know how to choose the right separation equipment.
Normally for OBM cuttings treatment, clients will separate cuttings and recover usable drilling fluids, and sell the drilling fluids. It is 2-phase separation. While for oil sludge treatment, clients will separate oil, water and solids. They do 3-phase separation.
Below are some general information to let clients know more about the different and about the equipment choosing.
1) As 3-phase centrifuge can only allow slurry with max. 10% solids content and particle size less than 2mm, 2-phase decanter centrifuge is must to be used before 3-phase separation to reduce the mud weight and solids percentage. After 2-phase centrifuge separation, the oil, water and soil mixture slurry flow into 3-phase decanter centrifuge to get oil, water and soil.
2) In order to remove as more ultra fine solids as possible, chemical dosing unit will be used together with decanter centrifuges for dewantering flocculation treatment. We quote you the 3-tank antomatic chemical dosing unit. It is used for powder chemicals. If you will use liquid chemical, pls tell me to revise the quotation.
3) Per our communication on Whatsapp. The pre-separation equipment for OBM cuttings and oil sludge is different. For pure OBM cuttings from shale shaker and mud cleaner, Vertical cuttings dryer is better. It can reduce the oil on the cuttings to 3% ~ 5%. It can remove more usable liquid. And the solids discharge is very dry.
But vertical cuttings dryer cannot be used to treat the soil sludge discharged from centrifuge. As its screen basket opening is 0.5mm, 0.35mm and min. 0.25mm. The soil cake from centrifuge is very fine and will all pass the screen opening.
4) Oil sludge is normally the mixture from different application, like drilling mud, drilling cuttings, soil cake from centrifuge separation, tank bottom slurry, slope oil, refinery waste oil slurry, industry waste oil, etc… The solids size and solids content is more complex. In this case, high G drying shaker is used for pre-seperation. And as the oil slurry is more complex, sometime, need to dilute and heating the sludge before separation. The solids waste discharge from High G drying shaker is with higher oil on the cuttings after separation. For example, before treatment the sludge with 15~20% oil content. After high G drying shaker, maybe around 10~15%, or even higher if the sludge with high viscosity and density.