The Mud tanks system consists of equipment on board that contributes to the storage, mixing, circulation and purification of drilling fluid. Drilling fluid is very expensive and large volumes are used in connection with drilling a well. It is therefore desirable to reuse drilling mud.
Mud Cleaning System
The mud tank system removes drilling cuttings that come up from the hole along with the drilling mud so that the cleaned mud can be returned to the well. If the mud does not have the proper properties in relation to the well, it can result in major damage to the well and the drilling equipment. After the cleaning process, the drilling mud is carefully checked to make sure that the cleaning system has done a satisfactory job.
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Effective rotary steerable drilling systems overcome most of the problems with steerable motors by providing continuos pipe rotation while drilling. This is accomplished, with the tool reported on in this paper, with a non-rotating steerable sleeve containing three extendable pads that push against the borehole wall.
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The importance of terminology properly defining a drilling fluid is becoming of greater significance. This includes the drilling contractor, the operator, the mud service engineer, and even the well completion service specialists who
must work with the well after the hole is down. As the number of products added to a given drilling fluid formulation increases, so does the importance of proper mud classification, proper metering and measurement of fluids and special additives.
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Water-based drilling fluids, regardless of the name assigned to them, usually contain clays, water soluble chemicals (including salts), a pH control additive (hydroxyl source), and one or more organic polymers, surfactants, and deflocculants.
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