Browse

Continuously increasing demand for energy resources drives petroleum industry to search in very deep waters, drilling very deep wells, encountering adverse conditions of pressures and temperatures and thus having to resolve a multitude of problems. In many cases, the problems can be attributed to the performance of drilling fluids which then presents challenges to drilling fluid industry. Such problems include poor hole cleaning, high pressure losses, loss circulation zones, fluid gelation, reservoir fluid invasio...

Drilling for mineral resources can be one of the most expensive processes in the exploration and production. Hence, drilling industry has been striving since its inception for developing drilling techniques which allow for fast drilling rates but ensuring the safety of the well and of the workers. Parameters affecting the drilling process can be cast in two major categories, rig and bit related parameters and formation parameters. The first category includes weight on bit, torque, rotational speed, and hydraulic p...

Waste disposal is the biggest humanity problem nowadays. This has been recognized worldwide and we are lucky because waste treatment is applied, at least at developed countries. On the other hand Nature is suffering a lot and biodiversity is reducing rapidly. The preservation and conservation of Nature has leaded European Union to establish the NATURA 2000 network in continuity of Ramsar Convention. In this paper the conditions and the status of the biotopes of the National Park of East Macedonia and Thrace, and p...