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,

Animals require strategies for Sun Hat coping with periods when food is scarce.Such strategies include storing fat as a buffer, and defending the rate of energy intake by changing foraging behaviour when food becomes difficult to obtain.Storage and behavioural defence may constitute alternative strategies for solving the same problem.We would thus

Background: The increased resorption and the difficulty of the fat graft take following autologous fat transplantation procedure are associated with reduced fat tissue revascularization and increased apoptosis of adipose cells.We suppose that the lipofilling procedure induces an inflammatory environment within the fat graft mass, whose Dog Toy evol