Dosco offers services for oil and gas drilling wells and exploration, production tests, workover jobs and environment protection. Dosco can also offer high qualified personnel within this industry and all the related fields of activity.

Drilling Rig Systems

Drilling rigs are one of the most important machines in the E&P activities of the Oil and Gas Industry. They can be massive or small to medium sized structures. The small to medium sized rigs are also called mobile rigs as they are mounted on trucks or trailers and can be easily transferred from one location to another location on wheels. The massive structure rigs can be either onshore rigs or offshore rigs.

Onshore rigs are rigs that perform drilling activities on land, whereas offshore rigs are rigs that perform drilling activities in sea or ocean.

The working platform for drilling work is called drilling rig. It holds the most components required for the drilling work. Main components comprise the drilling rig are: Power system, Hoisting system, Rotary system, Circulating system, Well control& monitoring system.


Casing and cementing

The drilling engineer must select the proper type, number and length of the casings required, depending on the type of the formation.  The properties of any casing must be rigorously evaluated. Then, after the hole is drilled, the casing can be set using special equipment. Before the drilling engineer can decide to dig deeper, the casing installed must be firmly bonded with the ground so that it doesn’t collapse. This can only be achieved by cementing the casing to the borehole. For cementing, the cement slurry is prepared. It is made out of cement powder, water and some additives. The cement slurry also has some properties that must be defined before the cement can be used. Using the properties of the casing and the cement slurry, the drilling engineer will calculate the volume of slurry required to fix the casing. Cementing jobs can encounter numerous accidents.





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