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Friday, March 16, 2012
Horizontal drilling methods(Reason and methods )
The choice of drilling method depends upon:
— Cost,
—Well spacing and
—Mechanical conditions
of a vertical well bore
—In addition,
reservoir consideration.
—
BUILD RATES
—Ultra-short Radius
—Short Radius
—Medium Radius
—Long Radius
ULTRA-SHORT RADIUS
—45 to 90 degrees per
foot
—Special...
Thursday, March 15, 2012
Directional Drilling Applications
—Sidetracking a Stuck Bottom hole Assembly
—Multiple Sidetracks
—Straighten The Hole Drilling
—Multiple Wells from an Artificial Structure
—Multilateral Wells Drilled From a Platform.
—Drilling Multiple Sands from a...
Directional Concepts
Dogleg
an abrupt change in direction in the wellbore,
frequently resulting in the formation of a key-seat.
a sharp bend permanently put in an object such as a
pipe, wire rope, or a wire rope sling.
Deflection angel > 3o/100 ft
Angle of Deflection
—in directional
drilling, the angle at which a well diverts from vertical
—usually...
Tuesday, March 13, 2012
Properties of mud
Properties of mud
Plastic Viscosity (PV)
•Control the magnitude of shear stress develops as one layer of fluid slides over another.
•Measure of friction between layers.
• Provides a scale of the fluid thickness.
• Decreases with increasing temperature; with liquids; the reverse with gasses .
•Effective viscosity depends...
Emulsion mud
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...
oil base mud
oil base mud •Water in oil emulsion•Diesel or crude oil forms its continuous phase•Sometimes called invert emulsion•Water droplets are emulsified in oil•Water is used for gel strength and barite content•Soaps are used as emulsifiers•Soups are made from monovalent ion (Na+) or divalent ion•(Ca++)•The soap molecule bridge together oil and water interfaces•Agitation is required to break the water into small droplets•Oil/water...
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