Yuqing Yang – författare

A popular 1990s formation tester with a single "pumping" probe and one passive "observation port" displaced 180 deg away, designed to measure pressures at two locations for permeability prediction, encounters well known detection problems at low mobilities. This book, using aerodynamics methods, explains why and also reveals the existence of a wide stagnation zone that hides critical formation details. And it does much more.  An exact analytical solution is used to validate a new transient, three-dimensional, finite difference model for more general testers, one that guides new hardware designs with independent azimuthally displaced probes having with different rates, flow schedules and nozzle geometries, supports interpretation and formation evaluation, and assists with job planning at the rigsite. The methods also apply to conventional tools, allowing comparisons between older and newer technologies. Importantly, the authors introduce a completely new three-probe design with independently operable active elements that eliminate all older tool deficiencies.Numerous subjects are discussed, such as pressure transient analyses with multiple operating probes, supercharge analysis with invasion and mudcake buildup, accurate and rapid calculations that allow more than 1,000 simulations per minute, extremely rapid batch mode calculations using convergence acceleration methods, rapid fluid withdrawal with minimal dissolved gas release, dip angle, heterogeneity and anisotropy evaluation, and many other topics.  In addition, tool operation sequences, detailed engineering and design functions, field test procedures and laboratory facilities, are discussed and illustrated in photographs that go "behind the scenes" at one of the world’s largest international oil service companies. The book hopes to educate new engineers and veteran engineers alike in hardware and software design at a time when increasing efficiency is crucial and "doing more with less" represents the new norm.

The Confucian notion of “Harmony with difference” (he er bu tong) has great political and cultural resonance in contemporary China, which propagates the quest for a pluralist harmony between cultural and ethnic components of society. In an attempt to examine a range of responses to this state-envisioned ideal of accommodating ethnic differences, this book analyzes the literary and cultural discourses that surround three minority regions in Southwest China — Dali, which was once the location of the ancient Nanzhao and Dali Kingdoms; the homeland of the matrilineal Mosuo known as the Country of Women; and the Tibetan areas associated with utopian Shangri-La. This book borrows Foucault’s concept of “heterotopia” to address the contradictory and often simultaneously existing views of the minority region as rich treasure house of tradition and as intractable barrier to modern development which combine to give rise to productive tensions in scholastic and artistic creations. Through reconstituting and performing the myths and legends of or about minority culture, the representations of the three places turn into heterotopias which are posed between the mythical and the real in different ways. Functioning as a self-reflective mirror, they simultaneously offer images of the actual habitats of the ethnic other which have been subject to socialist projects of modernity, and become a viable means by which to exert material effects on the real landscape. Products of a fascination with alternative social spaces, the three mystified lands all contain conceptualizations of harmony — be it spiritual, gender-based or ecological — that are conceivably absent in the imperfect actuality of the Chinese heartland. In conclusion, these aesthetically constructed spaces of the other negotiate and enrich the discourse of “Harmony with difference,” reacting to ethnic politics in PRC history and creating an audience that grows attentive to the traditions of minorities.