Limited space and high construction costs for Mud Pit:
Upon the investigation related with the drilling wastes of wells of Sis Enerji Üretim A.Ş. which reach minimum of 3,000 m. depth, it was observed that minimum 800 m² of surface area is needed to store an average of 2,500 m³ waste for each drilling operation. High cost of agricultural lands and constructional difficulties on steep terrains were interrupting factors choosing suitable location. Furthermore, high disposal costs were faced as another problem to empty the mud pits which were full of cuttings and liquid wastes before flow tests.
Insufficient Solid Control Equipment and its effect on Drilling Fluids:
Shale shakers and mud cleaner were inadequate to hold the mud weight and solid content of drilling fluid constant or between requested ranges. This situation caused the problems listed below:
* Increasing mud weight provoked high pump pressures leading to undesirable downhole losses or high fuel consumptions.
* Overconsumption of some drilling fluid chemicals were faced because of increasing solid content.
* Low rate of penetration.
* Low flow rates because of restricting screen sizes and pump pressures.
* High dilution volumes (costs) to decrease solid content.
* High disposal costs of dumped mud.
* High NPT (non-productive time) and damage costs caused by deformation on drilling equipment like pumps, directional drilling components and pipes.
Water consumption and limited water sources:
Fresh water was used while mixing the drilling fluid, cleaning surface equipment and cooling the motors contributed 60% of the wastes during the whole drilling operation. Supplying fresh water and disposing the dirty water after operations instead of cleaning and recycling caused another cost to the operator.