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There are more than 550 producing well in Zanarol Oilfield, of which nearly 60 percent of acid fractured wells have lost effectiveness, and need repeated stimulation. Candidate well selection is one of the key links which affects the re-fracturing effect. Based on the theory research of well selection methods, according to reservoir characteristics of Zanarol oilfield and stimulated well performance, production statistics, virtual intelligence and production prediction technique have been used to build repeated acid fracturing well selection model, a new way to select carbonate reservoirs and wells. Oilfield application shows this comprehensive method increased the effective ratio of re-stimulation, productivity and producing degree of single well have been increased by using different re-fracturing technique, playing an important role in keeping the production stable in Zanarol oilfield. [ABSTRACT FROM AUTHOR]

We investigate the four-wave mixing of matter wave packets created from a Bose–Einstein condensate, realized experimentally by utilizing light pulses to create two high-momentum wave packets via Bragg diffraction from a stationary condensate. Based on the Gross–Pitaevskii equation, a set of nonlinearly coupled envelope equations including self- and cross-phase modulational effects are derived systematically using a method of multiple-scales. The exact and explicit analytical solutions are provided for the coupled envelope equations and the evolution of the wave packets after turning off trapping potential is discussed and compared with experiment. [ABSTRACT FROM AUTHOR]

The mol-ecular structure of the title compound, [Sn(2)(C(10)H(13))(4)(C(14)H(20))Cl(2)], is a binuclear centrosymmetric complex, in which the Sn atoms are four-coordinated by three C atoms and one Cl atom in a distorted tetra-hedral geometry.