Reverse circulation:

Seldom used in open hole, but frequently used in workover operations.

Also referred to as “circulating the short way,” since returns from bottom can be obtained more quickly than in normal circulation.

Terms Related to Reverse circulation

• Mud circulation

  The process of pumping mud downward to the bit and back up tot he surface in a drilling or workover operation. See normal circulation, reverse ...

• Normal circulation

  The smooth, uninterrupted circulation of drilling fluid down the drill stem, out the bit, up the annular space between the pipe and the hole, and ...

• Displacement

  1. The weight of a fluid (such as water) displaced by a freely floating or submerged body (such as an offshore drilling rig). If the ...

• Circulation sub

  A downhole tool typically used with motors or assemblies that restrict the allowable fluid-circulation rates. When operated, the circulation sub allows a higher circulation rate to ...

• Circulation

  Movement of drilling fluid from mud pits, down drill stem, up annulus, and back to mud pits.

• Break circulation

  1. To start the mud pump for restoring circulation of the mud column. Because the stagnant drilling fluid has thickened or gelled during the period ...

• Bumper jar

  A device made up in the drill string that, when actuated, delivers a heavy downward blow to the string. A bumper jar has a hollow ...