1. identifying a drilling fluid family, according to the


1. Calcium
treated mud it prevent the swelling of formation shale, manage sloughing shale,
whole enlargement and also to prevent formation damage.

2. Polymer
mud is used in stabilize the formation and reduce filtrate less.

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3. Low
solid mud help in improving rate of penetration.

4. Work
over fluid used for acidizing and fracturing operation  and in inhibiting  swelling formation shale and minimize formation

5. Oil or
synthetic fluid is Useful in in hole stabilization, in high temperature wells,
deviated holes and pipe sticking problem.

6. Mixed
metal hydroxide mud used for stabilization of borehole and protection of
producing formation, to lower pump resistance and for suspension of solid
during shut down and it improve drilling rate and cutting removal.

7. Oil
based drilling fluid is used to stabilize clay formation and for tolerating
salt formation.

       In any drilling operations, there must
be proper and a general planning of the well in order to select the best
drilling mud to drill well bore. Commonly, criteria for selecting drilling
fluid are based on how they should easy to use (performance of drilling fluid),
not too expensive and environmentally friendly (like skin irritation and
contact dermatitis). selecting drilling fluid system starts with identifying a
drilling fluid family, according to the nature of formation and choice of the
mud formulation will be the second step, one has to decide on the range of
desired properties, leading to use a minimum amount of additives, therefore for
selection of drilling fluid system for a particular well is based on many

                               – local
practices and operator performance

                              – density required to control subsurface
pressure and hole size

                              – characteristics
of the formation to be drilled including well bore stability

                             – Supplier range
of systems and products

                           – Anticipated temperature and pressure

                          – Completion type,
health, safety environment (HSE) consideration

     mixed metal hydroxide drilling fluid have
been used successfully in horizontal wells, in tunneling under river and road,
for drilling in fluids, for drilling large diameter holes, and with coiled
tubing. Non aqueous based drilling fluid used in a particularly remote or
environmentally sensitive area and commonly preferred option for high
temperature application