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,

Sugarcane (Saccharum officinarum L.) may be infected with Apiospora, which can produce the toxin 3-nitropropionic acid (3-NPA) during improper transportation and storage.The consumption of sugarcane that contains 3-NPA can lead to food poisoning.Therefore, this study sought to explore a novel biocontrol agent to prevent and control Apiospora mold.B

In this work we consider a problem of scheduling preemptable, independent jobs, characterized by the fact that their processing speeds depend on the amounts of a continuous, renewable resource allocated to jobs at a time.Jobs are scheduled on parallel, identical machines, with the criterion of minimization of the schedule length.Since two categorie

Purpose: A integration model of social classification in the audiovisual repositories is Trimmers presented with the aim of being used to identify and retrieve contents between external users and journalists of the organization itself.Design: All the scientific literature has been reviewed interpreting the scarcities and problems found by journalis

In this paper, we describe an approach to database preference queries based on the notion of outranking, suited to the situation where preferences on different attributes are not commensurable.This model constitutes an alternative to the use of Pareto order whose Toy Cleaner main drawback is to leave many tuples incomparable in general.Even though