The distribution of paramagnetic centres in carbon black filler in the interphase layer of the thiokol-epoxy hermetics on the border of brass or glass substrate was studied using EPR· imaging method. It was shown that the relative content of radicals decreases near the hermetic-"rigid" surface contact border. The thickness of the layer with a low concentration of radicals is estimated as 0.5±0.3 mm, The inhomogeneous distribution of radicals is more obvious in the case of hermetic hardening on a brass surface. These results are explained by a catalytic acceleration of the thiokol-epoxy polymerization reaction in the region of hermetic-metal surface contact.

Formation evaluation provides the input data for reserves’ estimation and oil recovery strategy. Usually core analysis and log-interpretation calibrated with core data are the primarily sources of information. If there are some unsolved problems during core analysis stage, both log-interpretation and following estimations and conclusions could be wrong. We faced with such situation while evaluating properties of weakly consolidated sandstones and un-consolidated sands in Permian formations of Tatarstan Republic in Russia a few years ago. The problems were primarily associated with destruction of the rocks structure during the core recovery. Weight hydrocarbon saturation and grain size distribution were the only properties determined for these formations by conventional core analysis. It was impossible to determine porosity, permeability and volume hydrocarbon saturation which are critical for modeling and reservoir engineering purposes. Improved non-conventional method of core analysis described in this paper has been applied to solve this problem. The method suggests different approach depending on rocks’ consolidation. Since year 2005 more than 900 meters of core from twenty-three parametric wells were studied using the method proposed in this paper. As a result, necessary correlations for log interpretation have been adjusted. Application of the method allowed reasonable evaluation of the heavy-oil Ashalchinskoye field. The estimation for porosity has been increased from 30% to 34%, and permeability estimates were increased from 300 mD to 1-3 D. The new estimates of the reservoir properties allowed to suggest SAGD method for oil recovery, which otherwise would be uneconomical. The SAGD method is currently being implemented in this oilfield. Thus, the described unconventional core analysis method has proved its efficiency and can be recommended for further usage.

The paper presents the results of laboratory nuclear magnetic resonance (NMR) studies of oil-saturated core samples of the Sheshminskian horizon of heavy oil fields in the Republic of Tatarstan. The analysis of the results showed that T2 spectra of oil recovered via centrifugation from the pre-heated core and oil remaining in the core are substantially different from each other. Magnetic relaxation rate of residual oil is much faster, and thus its viscosity is significantly higher than that of the recovered oil. The difference can be up to ten times. The spectrum of relaxation times T2 in the original oil-saturated core integrates information about all the fluid contained in the rock. The results and findings underscore the ability of NMR logging tools to characterize the entire oil fluid in the rock in situ.

Решение проблемы оценки свойств несцементированных коллекторов сверхвысоковязкой тяжелой нефти на месторождениях Татарстана К.М. Мусин, SPE, ТатНИПИнефть ОАО «Татнефть», Р.С.Хисамов и Р.Ш. Динмухамедов, ОАО «Татнефть» Авторское право 2010 г., Общество инженеров-нефтяников Настоящий документ был подготовлен для презентации на Российской технической нефтегазовой конференции и выставке SPE 2010 в Москве, Россия, 26-28 октября 2010 г.Настоящий документ был выбран для презентации программным комитетом SPE по итогам анализа информации, содержащейся в реферате, предоставленном автором (авторами). Содержание документа не анализировалось Обществом инженеров-нефтяников и подлежит корректировке автором (авторами). Материал не обязательно отражает какие-либо позиции Общества инженеров-нефтяников, его руководителей и участников. Электронное воспроизведение, распространение или хранение любой части данного документа без письменного согласия Общества инженеров-нефтяников запрещается. Разрешение на воспроизведение в печатном виде ограничено рефератом в объеме не более 300 слов, копировать иллюстрации не разрешается. В реферате должно содержаться явное признание авторского права SPE.

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