Drilling starch for drilling fluids, or muds as they are sometimes called, are slurries of clayey solids used in the drilling of wells for tapping underground collections of oil, gas, brine, or Water. There is a lot of fluids in drilling field. But important part is which kind of drilling fluids is more effective for removing the cutting from well, to seal off formations of gas, oil, or water which may be encountered at different levels.The other hand to lubricate the drilling tool fpr prevent overheating.
When a drilling fluid having the proper viscosity, the proper gel rate and proper gel strength for circulation through a well bore is permitted to stand in the well bore in the quiescent state, it develops sufficient gel strength to prevent settling of the cuttings, sand or weighting ma terial, etc., in the well bore when it becomes necessary to discontinue circulation for any appreciable period of time. Such a fluid is also characterized by its ability to form a mud cake on the borehole wall, thereby assisting in sealing off the traversed formations and inhibiting so called water loss, i.e., loss of water from the drilling fluid.In conclision if we in view of the fact that these reason drilling starch for drilling have a crucial importance in drilling process.