Superior dependability of the drill string plays an important role in drilling deep and especially ultra-deep, highly inclined and long departure horizontal wells, where it is often exposed to extreme loading conditions in a high pressure and high temperature environment. This need has resulted in the technological development of high strength Aluminum Drill Pipe (ADP) for use in deep and ultra-deep wells, where its' properties and the advantages that it offers can make a significant contribution to reaching the most challenging of drilling targets. Drilling intervention operations such as milling and fishing are also a major challenge in such extreme environments and have led to the development of new tools and techniques to address them. This paper will review the use of ADP in comparison to steel drill pipe and discuss the milling scenarios of cemented and un-cemented drill pipe as well as fishing operations using external and internal engagements. The intent of this paper is to disseminate technical knowledge in this new area of drilling technology.

An ontology together with a set of individual instances of classes constitutes a knowledge base. In reality, there is a fine line where the ontology ends and the knowledge base begins. For the purposes of this study an ontology is a formal explicit description of concepts in a domain of discourse (classes, Sometimes called concepts), properties of each concept describing various features and attributes of the concept (slots, sometimes called roles or properties)), and restrictions on slots (facets, sometimes called role restrictions) (Gruber, 1993;Vlăduțescu, 2013).

Paradoxism is an avant-garde movement in literature, art, philosophy, science, based on excessive use of antitheses, antinomies, contradictions, parables, odds, paradoxes in creations. It was set up and led by the writer Florentin Smarandache since 1980's, who said: "The goal is to enlargement of the artistic sphere through non-artistic elements. But especially the counter-time, counter-sense creation. Also, to experiment." Paradoxism = paradox + ism, means the theory and school of using paradoxes in literary, artistic, philosophical, scientific creations. "Paradoxism started as an anti-totalitarian protest against a closed society, Romania of 1980's, where the whole culture was manipulated by a small group. Only their ideas and their publications counted. We couldn't publish almost anything. Later, I based it on contradictions. Why? Because we lived in that society a double life: an official one - propagated by the political system, and another one real. In mass-media it was promulgated that 'our life is wonderful', but in reality 'our life was miserable'. The paradox flourishing!” (Florentin Smarandache). The new theory generalizes the fuzzy logic and introduces also two new concepts: “neutrosophy”, the study of neutralities as an extension of dialectics and its derivative “neutrosophic”, such as “neutrosophic logic”, neutrosophic set”, “neutrosophic probability”, and “neutrosophic statistics” opening in this manner ways of research in four fields: philosophy, logics, set theory and probability/statistics. According to this new theory is also available Albers Einstein’s statement: “Not everything that can be controled counts and not everything that counts can be counted “

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