Drilling fluids circulation system in oilfield

Drilling fluids circulation system in oilfield.
China expert in manufacturing oilfield related system can give you appropriate solution with circumspect service at your required low cost.

Reverse Circulation (RC)Drilling. Although RC drilling is air-powered, water is also used, to reduce dust, keep the drill bit cool, and assist in pushing cutting back upwards, but also when collaring a new hole. A mud called liqui-pol is mixed with water and pumped into the rod string, down the hole. This helps to bring up the sample to the surface by making the sand stick together. Occasionally, 'super-foam' (AKA 'quik-foam') is also used, to bring all the very fine cuttings to the surface, and to clean the hole. When the drill reaches hard rock, a collar is put down the hole around the rods which is normally PVC piping. Most companies will regularly 'sharpen' the buttons on their drill bits in order to prevent this, and to speed up progress. Occasionally the collar may be made from metal casing. Collaring a hole is needed to stop the walls from caving in and bogging the rod string at the top of the hole. Collars may be up to 60 metres deep, depending on the ground, although if drilling through hard rock a collar may not be necessary.

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