Changes

==Doglegs==

==Doglegs==

A ''dogleg'' is usually defined as any deviation greater than 3° per [[length::100 ft]], and it occurs when a sharp change of direction is taken in the wellbore. Typically, a dogleg is caused by a change in the [[dip]] of the formation or by a change in the weight applied to the bit. Severe doglegs can result in stuck casing, drill pipe failure, and inability to run [http://www.glossary.oilfield.slb.com/en/Terms/c/casing.aspx casing] to total depth. If casing is successfully run through the dogleg, excessive wear on production equipment can occur. The use of properly placed stabilizers, large diameter drill collars, and the proper weight applied to the bit will minimize the formation of doglegs.

A ''dogleg'' is usually defined as any deviation greater than 3° per [[length::100 ft]], and it occurs when a sharp change of direction is taken in the wellbore. Typically, a dogleg is caused by a change in the [[dip]] of the formation or by a change in the weight applied to the bit. Severe doglegs can result in stuck casing, drill pipe failure, and inability to run [http://www.glossary.oilfield.slb.com/en/Terms/c/casing.aspx casing] to total depth. If casing is successfully run through the dogleg, excessive wear on production equipment can occur. The use of properly placed stabilizers, large diameter drill collars, and the proper weight applied to the bit will minimize the formation of doglegs. (See [[Wellbore trajectory]].)

==Key seats==

==Key seats==