A wellbore is a hole that is drilled to assist exploitation of natural resources including oil, gas or water. Wellbore will be the primary hole which the final well will be made. Also, wellbore can be encased by Steel or Cement or may not be encased depending on the situation.
In OIL WELLS, to make the wellbore, it is necessary to encase the Wellbore by Cement. Adding the GILSONITE material during Oil Well cementing, enhances the Isolation characteristics while decreasing the vertiginous Gas flows. These characteristics can result into more effective mud removal which also enhances the Environmental factors since drilling environmental regulations are getting stricter around the world.
The nature of Gilsonite, allows this material to act as binder and to fill the cracks made in the wellbore casing causing better bonding and avoiding isolation in different zones.
The Gilsonite which needs to be applied in Oil Well Cementing is standard quality lump grade Gilsonite. Basically, when an oil well is finished off, a mixture of cement and rock aggregate is pumped down the well to encase the oil pipe into the formation. Pumping such a heavy mixture of cement and rock down into a well and back up again is a very expensive process. Replacing much of the heavy rock with light-weight Gilsonite particles reduces the pumping costs dramatically. Therefore applying Gilsonite in Oil Well Cementing is simply a “rock replacement.”