Emulsion mud
•Water is a continuous (normal oil 5-10% by volume)
•Formulated by using sodium soap as emulsifier
•Oil is added to
increase penetration rate:oil mud allows to drill faster than watermud
• reduce filter loss,
•improve lubricity,
• reduce lost circulation
•reduce torque and drag in directional well
•The stability of emulsion mud is very important to insure best performance.
The degree of stability of a certain emulsion can be measured by several observations. The resistance of an emulsion to conduct electric current (or the breakdown voltage) is one of the important measurements which determine emulsion stability. Also filtration loss and mud viscosity are often considered measures of mud stability.
•The oil soluble polymers in a form of a gel, according to the instant invention, allow a good thermal stability and avoid any rheological contribution. They may be used at high temperature and high pressure conditions.
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