Lecture 5 - Underbalancedmudsystem-new.ppt - Wellbore Fluids Management Underbalanced Drilling and Coiled Tubing Fluids Underbalanced Drilling •

Lecture 5 - Underbalancedmudsystem-new.ppt - Wellbore...

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Wellbore Fluids Management Underbalanced Drilling and Coiled Tubing Fluids
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Underbalanced Drilling Applications Lost Circulation Areas Depleted Reservoirs Minimize Formation Damage Equipment Required Gas/Air Compressor and Boosters Rotating Head Chemical Injection Pumps Foam Generator Units
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Pneumatic Drilling Fluids Chemicals Required - Surfactants Anionic or nonionic surface active agents to inject into the inlet air stream when formation water is encountered. Help clean the hole Keep the bit and drill string free of sticky solids Stop the formation of mud rings Convert to foam
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Chemicals Required - Corrosion Inhibitors Corrosion during pneumatic drilling can be disastrous unless the drill string is protected from oxygen, carbon dioxide, and hydrogen sulfide. Maintain a high pH Inject corrosion inhibitors/scavengers Filming amines, phosphonates zinc scavengers Pneumatic Drilling Fluids
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Chemicals Required - Drying Agents A wellbore which contains only a minor amount of water can be dried by either air circulation or slugs of a drying agent. Need a dry chemical injector CMCs Silicate powders Pneumatic Drilling Fluids
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Design Considerations Pore Pressure Rock Types Porosity/Permeability Reservoir Fluids Economics Location Pneumatic Drilling Fluids
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Dry Gas (air,natural gas, nitrogen Mist Foam Gasified/Aerated Mud Pneumatic Drilling Fluid Types
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  • Fall '18
  • James Bonifacio

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