THE FORMATION OF KHARIJITE STATES IN NORTH AFRICA

THE FORMATION OF KHARIJITE STATES IN NORTH AFRICA

At the peak of the spread of intellectual and political movements in early Islamic history, particularly during the period when power was being transferred form shoe palace proofer the Umayyads to the Abbasids, an influential sect, often known as the Khrijites, managed to muster support for its ideas in a number of peripheral territories at distant

read more

Study on factors affecting vertical drilling bottom hole assembly performance and a new bottom hole assembly design method considering formation uncertainties

Drilling a deep vertical well at a low cost is very important for accelerating the exploration and development of oil and gas resources.Vertical drilling BHA design is the key to drill a vertical well, however the BHA design is still an art not science in some formation.In this paper, a new mechanical model of bent-housing motor BHA is established,

read more