drill-in fluid

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A special fluid designed exclusively for drilling through the reservoir section of a wellbore. The reasons for using a specially designed mud are to

  • successfully drill the reservoir zone, often a long, horizontal drainhole
  • minimize damage and maximize production of exposed zones
  • facilitate the well completion needed, which can include complicated procedures.

A drill-in fluid should resemble a completion fluid. It may be a brine containing only selected solids of appropriate particle size ranges (salt crystals or calcium carbonate) and polymers. Only additives essential for filtration control and cuttings carrying are present in a drill-in fluid.

See: bland coring fluidbrinecalcium carbonatecarboxymethyl starchcarrying capacitycesium acetatecesium formatecompletion fluidconventional mudcorefilter pressfiltrate tracerfiltrationformateformation damagehydroxypropyl starchparticle-plugging testsinteredsized calcium carbonatesized saltslurry

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