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1

Laboratornye issledovania vliania kislotnoj obrabotki produktivnogo plasta na ego fizyko-mehaniceskie svosjtva i pronicaemost’

Mihajlov N., Plotnikov V., Popov S.

Prace Naukowe Instytutu Nafty i Gazu

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2016

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nr 209 wyd. konferencyjne

773--777

RU

При разработке нефтяных и газовых месторождений повсеместно используется метод интенсификации притока в виде кислотной обработки пласта. По мнению широко круга специалистов, подобные технологические мероприятия должны привести к увеличению проницаемости околоскважинной зоны пласта и уменьшить упругие и прочностные свойства данной области, что позволит повысить эффективность производства гидроразрыва пласта. В связи с вышесказанным в рамках данной работы приводится разработанная авторами методика исследования изменения проницаемости, упругих и прочностных свойств терригенных образцов керна под воздействием кислотного состава. Приведены результаты определения данных характеристик на примере некоторых исследований. Выявлены закономерности варьирования проницаемости образцов в процессе фильтрации кислотного состава. Показано изменение физико-механических свойств пород-коллекторов при нагнетании кислоты. Определены корреляционные зависимости между количеством прокачанных поровых объемов кислотного состава, упругими и прочностными свойствами, определенными динамическим и статическим методами до и после обработки реагентом.

EN

: In development of the oil and gas fields commonly is used the method of stimulation in the form of acidizing. According to the wide range of specialists, such technological measures must lead to an increase in the permeability in the bottomhole zone of the wells and reduce the elastic and strength properties of this region, which will increase the production efficiency of hydraulic fracturing. In connection with above, in this work there is introduced the method of studying the changes in permeability, elastic and strength properties of the sandstones core samples under the influence of acidizing, developed by the authors of this paper. The results of determining of these characteristics of the sandstones core samples are presented. The variations of permeability changes of the core samples in the process of filtering the acid composition are shown. The changes of elastic and strength properties of reservoir rock under the acidizing was presented. The correlation relationships between the amount pumped pore volumes of acid composition, elastic and strength properties, determined by the dynamic and static methods before and after the acidizing, were obtained.

2

Oligocene bivalve faunas from the Silesian Nappe, Polish Outer Carpathians: Evidence for the early history of the Paratethys

Studencka B., Popov S., Bieńkowska-Wasiluk M., Wasiluk R.

Geological Quarterly

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2016

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Vol. 60, No. 2

317--340

EN

The study is focused on the taxonomic inventory of an intriguing bivalve fauna from the Lower Oligocene Menilite Beds (Dynów Marls) within the Silesian Nappe, Polish Outer Carpathians. Sixteen bivalve species have been identified within the material collected in two small quarries in Jabłonica Polska near Krosno. Stratigraphic and geographic distributions of all recognized species are considered. This assemblage, the first of this kind in Poland and one of three recognized in the Outer Carpathians, shows clear affinities to coeval typical Solenovian faunas from Ukraine to Kazakhstan, with particular comparison made to bivalve faunas from the Menilite Formation (Subchert Member) within the Boryslav-Pokuttya Nappe, Ukrainian Outer Carpathians. Moreover, this study presents an overview of the main aspects and definitions of the date of the Paratethys origin. The main criterion used to define the time of the Paratethys birth is the distinct faunal turnover from the moderately diverse boreal or Tethyan bivalve faunas populating particular basins of the Northern Peri-Tethys in the earliest Oligocene to the uniform, highly endemic fauna inhabiting the newly formed semi-closed basin. This vast inland sea, named Paratethys, was populated by representatives of eight euryhaline bivalve families. They are characterized by extinct Paratethyan genera, such as Bessia Kojumdgieva et Sapungieva, Merklinicardium Popov, Korobkoviella Merklin, Urbnisia Goncharova, Ergenica G. Popov and Janschinella Merklin.

3

Ethylaxanthate adsorption and kinetics of adsorption on lead modified galena and sphalerite under flotation conditions.

Vucinic D., Popov S., Tomanec R., Lazic P.

Fizykochemiczne Problemy Mineralurgii

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1998

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Vol. 32

69-81

EN

The effect of lead ions on the galena and sphalerite surface properties, ethylxanthate adsorption in alkaline medium were studied for the possible use of recycled flotation water. The flotation tests and the zeta-potential measurements were carried out and correlated with the results of the infrared attenuated total reflection spectrophotometry (ATR-IR) and UV data. Lead adsorbed on the galena or sphalerite surface as Pb()H)+ and less as Pb 2+ reduces the collectorless galena floatabiblity from pH 7 to 9.5, but has a strong activating effect on natural sphalerite floatability (in PH range 7.6-10.5). After collection of Pb-modifield minerals with K-ethylxanthate both forms of lead athylxanthate, monolayer Pb-EX (chemiclally adsorbed (EX~), and multilayer, physically adsorbed Pb (EX)2 were detection on the mineral surface. Sphalerite flotated nearly 100% in the examined pH range but galena floated better anly from PH 8 to 9.5 (85-95%). The main surface reaction in pH range 8-9,5 is probably the ion-exchange reaction M-Pb-OH + (EX)- = M-Pb-EX +(OH)- (M - mineral), which contributes to the chemical adsorption of (EX)- ion is the reaction of pseudo-first order (on Pb-midifield galena - rate constant is k = 0.711 min -1; on Pb-modifield sphalerite k=0.102 min -1).

PL

Badano wpływ jonów ołowiu (II) na powierzchniowe właściwości galeny i sfalerytu oraz kinetykę adsorpcji ksantogenianu etylowego w środowisku alkalicznym w celu określenia możliwości ponownego użycia wód flotacyjnych. Przeprowadzono flotację i pomiary potencjału dzeta, które skorelowane z wynikami wod flotacyjnych. Przeprowadzono flotację i pomiary potencjału dzeta, które skorelowano z wynikami badań spektroskopowych w podczerwieni (ATR-IR) i ultrafilolecie (UV). Ołów zaadsorbowany na powierzchni galeny i sfalerytu jako Pb(OH) oraz mniejszym stopniu jako Pb +2 redukuje flotowalność galeny w zakresie pH od 7 do 9,5 oraz ma silne działanie aktywacyjne na naturalną flotowalność sfalertu w zakresie pH od 7,6 do 10,5. Na powierzchniach ziarn minerałów aktywowanych jonami ołowiu i wyflotowanych za pomocą ksantogenianu etylowo-potasowego wykryto obie formy ksantogenianu ołowiu tj. monowarstwę chemiczne zaadsorbowanego ksantogenianu (-Pb-EX) i wielowarstwę fizycznie zaadsorbowanego (Pb(EX)2. Sfaleryt flotował prawie całkowicie w badanym zakresie pH, a galena flotowała lepiej tylko przy pH od 8do 9,5 przy uzysku 85-95%. Główne reakcje zachodzące na powierzchni w zakresie pH 8-9,5 to prawdopodobie reakcja wymiany M-Pb-OH + (EX)- =M-Pb-EX + (OH)- , gdzie M oznacza minerał, co daje chemicznie zaadsorbowaną monowarstwę -Pb-EX na powierzchni minerału. Reakcja pomiędzy minerałem, który był modyfikowany jonami ołowiu i jonem (EX)- jest reakcją pseudo pierwszego rzędu. Na galenie modyfikowanej jonami ołowiu stała szybkość wynosi k=0,711 min -1 podczas gdy na modyfikowanym jonami ołowiu sfalerycie ma wartość k=0,102 min -1.

4

The bivalve faunas as a basis for reconstruction of the Middle Miocene history of the Paratethys

Studencka B., Goncarova I., Popov S.

Acta Geologica Polonica

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1998

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Vol. 48, no. 3

285-342

EN

The paper deals with the Paratethyan bivalve fauna recorded in Middle Miocene marine shallow-water sandy facies. Of the 429 recognized species, 343 occur in the Lower Badenian, 71 in the Chokrakian, 316 in the Upper Badenian, and 97 in the Konkian. Bivalve faunas are analyzed in order to determine the degree of similarity of contemporaneous assemblages from the Central and Eastern Paratethys, as well from Mediterranean and Atlantic bioprovinces. The study of Lower Badenian and Chokrakian bivalve faunas (isochronous with the Langhian fauna of the Mediterranean) reveals that the Eastern Paratethys was cut off intermittently from communication with the Central Paratethys. Biogeographic affinities and the geographic pattern of Chokrakian bivalve assemblages indicates that the south-eastern part of the Eastern Paratethys was connected with the world ocean by a passage towards the East Mediterranean named the Middle Araks Straight. The species composition of Lower Badenian bivalve assemblages indicates a wide connection between the Central Paratethys and the Mediterranean. Apart from the western passage named the Transtethyan Trench Corridor, The East Mediterranean connection is postulated. Comparision of the species composition of Konkian and Upper Badenian bivalve assemblages (isochronous with the lower Serravallian assemblages of the Mediterranean) suggests active faunal interchange between the Eastern and Central Paratethys. The distributional pattern of the Konkian bivalve fauna also indicates a seawy connection towards the East Mediterranean throught the re-opened Middle Araks Straight. The strong similarity between the Upper Badenian fauna from the Central Paratethys and the Middle Miocene fauna of the Mediterranean and Atlantic bioprovinces shows the existence of open marine connection and faunal interchange despite the closure of the Transtethyan Trench Corridor.