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2017/4
Research of specific aspects in interaction between oil and acid compositions in porous medium
Chemical sciences

Authors: MAGADOVA graduated from Gubkin Moscow Institute of Petrochemical and Gas Industry. She is Ph.D., Professor of the Department of Chemical Engineering for Oil and Gas Industry of Gubkin Russian State University of Oil and Gas (National Research Univer- sity), director of Scientific and Research Center „Promislovaya Himiya”. She is author of 150 scientific publications, 60 patents and 4 methodological works. She specializes in the field of oil-field chemistry, chemical agents and technologies for production stimulation, enhanced oil recovery, repair and insulation works and oil treatment. E-mail: lubmag@gmail.com
Ljucija F. DAVLETSHINA graduated from Al’met’evsk State Oil Institute in 1998, she is Candidate of Technical Sciences, assistant professor of the Department of Chemical Engineering for Oil and Gas Industry of Gubkin Russian State University of Oil and Gas (National Research University). She specializes in the field of oil-field chemistry. She is author of 60 scientific publications.
E-mail: luchiad@mail.ru
Vladimir B. GUBANOV graduated from Moscow Engineering Physics Institute. He is leading researcher in the Scientific and Research Center „Promislovaya Himiya”. He specializes in the field of seepage studies of agents for production stimulation, enhanced oil recovery, repair and insulation works. He is author of 50 scientific publications and 15 patents of invention.
E-mail: gubanowww@gmail.com
Polina S. MIKHAYLOVA is a student of the Department of Chemical Engineering for Oil and Gas Industry of Gubkin Russian State University of Oil and Gas (National Research University). She is author of 5 scientific publications. E-mail: mihaylovapolly@mail.ru
Viktoria D. VLASOVA is a student of the Department of Chemical Engineering for Oil and Gas Industry of Gubkin Russian State University of Oil and Gas (National Research University). She is author of 3 scientific publications. E-mail: vica-vv@yandex.ru

Abstract: In spite of all the benefits of acid treatment and good practice the efficiency of the process decreases. One of the reasons of this is high viscosity oil emulsions and precipitation formation during acid placement as well as acid interaction with oil in reservoir conditions is one of the reasons of this.
A sample of degassed and dry crude oil from Romashkinskoye oil field was used for investigation of oil hydrocarbon behavior during interaction between oils and acid compositions. Compatibility tests in free volume were made with equal quantities of oil and acid compositions put in a test tube and mixed. After this the stability and viscosity of formed emulsions were determined. Compositions based on hydrochloric and sulfamic acids were studied.
Interaction of the acid compositions in pore volume was studied. The received data was also compared with the results of the experiments with oil, acids, water and surfactants in similar conditions

Index UDK: 622.276.63

Keywords: acid treatment, oil-acid emulsions, seepage studies

Bibliography:
1. Mordvinov V.A., Glushhenko V.N. Reservoir performance and acid composition influence on acidizing efficiency. Geologija, geofizika i razrabotka neftjanyh i gazovyh mestorozhdenij, 2002, no. 11, p. 22-26 (in Russian).
2. Davletshina L.F., Tolstyh L.I., Mikhaylova P.S. On the necessity of hydrocarbons behavior patterns researching with a view to increase of reservoir acidizing effectiveness. Territory NEFTEGAZ, 2016, vol. 4, p. 95-96 (in Russian).
3. Fedorenko V.Ju., Nigmatullin M.M., Petuhov A.S., Gavrilov V.V., Krupin S.V. Acid compositions for bottom-hole formation zone treatment. Ferric ions content optimization as applied to some oils from povolzhskiy region. Vestnik Kazanskogo tehnologicheskogo universiteta, 2011, no. 13, p. 136-140 (in Russian).
4. Amijan V.A., Ugolev V.S. Fiziko-himicheskie metody povyshenija proizvoditel’nosti skvazhin [Physicochemical methods of well’s yield increase]. Moscow, Nedra, 1970, 279 p (in Russian).
5. Kelland M.A. Promyslovaja himija v neftegazovoj otrasli [Production chemicals for the oil and gas industry] (under the ed. of Magadova L.A). Profession, 2015, no. 2, pp. 238-239 (in Russian).
6. Davletshina L.F., Mikhaylova P.S., Akzigitov E.A. Behavior of oils from one oil field while selecting acid compositions for terrigenous reservoir treatments. Trudy Rossijskogo gosudarstvennogo universiteta nefti i gaza imeni I.M. Gubkina, 2017. , no. 2/287, pp. 153-162 (in Russian).
7. Magadov R.S., Silin M.A., Gaevoj E.G., Magadova L.A., Pahomov M.D., Davletshina L.F., Mishkin A.G. Upgrading of acid composition using Neftenol K. Neft’, gaz i biznes, 2007, no. 1-2, p. 93-97 (in Russian).
8. Silin M.A., Magadova L.A., Cygankov V.A., Muhin M.M., Davletshina L.F. Kislotnye obrabotki plastov i metodiki ispytanija kislotnyh sostavov: uchebnoe posobie [Reservoir acidizing and acid system test : a textbook]. PC RGU nefti i gaza imeni I.M. Gubkina, 2011, 119 p. (in Rus- sian).
9. Vahrushev S.A., Kotenev Ju.A. Composition investigations for acid exposure to high-grade carbonate reservoir. Neftegazovye tehnologii i novye materialy. Problemy i reshenija. Sbornik nauchnyh trudov. Ufa: OOO „Monografija”, 2015, p. 252-261 (in Russian).
10. Gavrilova N.N., Nazarov V.V., Jarovaja O.V. Mikroskopicheskie metody opredelenija razmerov chastic dispersnyh materialov: ucheb.posobie [Microscopic methods of definition of particles size in dispersive materials: a textbook] Moscow, RHTU imeni D.I. Mendeleeva, 2012, 52 p. (in Russian).

2017/2
Behavior of oils from one oil field while selecting acid compositions for terrigenous reservoir treatments
Chemical sciences

Authors: Ljucija F. DAVLETSHINA graduated from Al’met’evskij State Oil Institute in 1998, she is Candidate of Technical Sciences, assistant professor of the Department of Chemical Engineering for Oil and Gas Industry of Gubkin Russian State University of Oil and Gas (National Research University). She specializes in the field of oil-field chemistry. She is author of 60 scientific publications.
Е-mail: luchiad@mail.ru
Polina S. MIKHAYLOVA is a student of the Department of Chemical Engineering for Oil and Gas Industry of Gubkin Russian State University of Oil and Gas (National Research University). Е-mail: mihaylovapolly@mail.ru

Abstract: Most of fields currently turn to the late stage of development, connected with decline of production and physical-chemical change of hydrocarbons. The article states in terms of five wells that acidizing efficiency could be decreased by various interacting between acid and crude oils from explored wells. These interactions can result in emulsions or precipitations, which cause problems in acid and colmatants interactions. This process deteriorates in presence of iron compounds in the bottom-hole area. Iron compounds take place because of ageing well stock. Thus, based on investigations it should be observed that before acid treatment it is necessary to check acid and oil compatibility individually for each case.

Index UDK: 622.276.63

Keywords: acid treatment, selection of acid composition, precipitation, emulsions

Bibliography:
1. Silin M.A., Magadova L.A., Cygankov V.A., Muhin M.M., Davletshina L.F. Reservoir acidizing and acid system test : a textbook. PC RGU nefti i gaza im. I.M. Gubkina, 2011, p. 44, 93-94 (in Russian).
2. Wong T.C., Hwang R.J., Beaty D.W., Dolan J.D., McCarty R.A., Franzen A.L. Acid sludge characterization and remediation improve well productivity and save costs in the Permian Basin. SPE, paper for presentation at the Permian Basin Oil&Gas recovery Conference, Texas, 1996, p. 414-415.
3. Shakurova Al.F., Shakurova Aj.F. Simulation of hydraulic fracturing. Oil and Gas Enginee- ring: Electronic Scientific Journal, 2014, vol. 2. Available at: http://ogbus.ru/ authors/Shakurova/Shakurova_4.pdf (Accessed 10 January 2017). (in Russian).
4. Davletshina L.F., Tolstyh L.I., Mikhaylova P.S. On the necessity of hydrocarbons behavior patterns researching with a view to increase of reservoir acidizing effectiveness. Territory NEFTEGAZ, 2016, vol. 4, p. 95-96 (in Russian).
5. Loewen K., Chan K.S., Fraser M., Leuty B. A well stimulation acid tube clean methodology. Soc. Petrol. Eng., 1990, p. 47-1-2.
6. Taylor K.C., Nasr-El-Dln H.A., Al-Alawl M.J. Systematic study of iron control chemicals used during well stimulation. SPE journal, 1999, vol. 4, no. 1, p. 19-20.
7. Kelland M.A. Production chemicals for the oil and gas industry. Under the ed. of L.A. Magadova. Profession, 2015, no. 2, p. 238-239 (in Russian).
8. Dill W., Smolarchuk P. Iron control in fracturing and acidizing operations. JSPT, 1988, vol. 27 (May-June), no. 3, p. 76.
9. AlMubarak T. Investigation of acid-induced emulsion and asphaltene precipitation in low permeability carbonate reservoirs. Soc. Petrol. Eng, 2015. Available at: https://www.onepetro.org/ (accessed 14 January 2017).
10. Rietjens M., Mieuwpoort M. Acid-sludge: How small particles can make a big impact. The Hague, SPE European Formation Damage Conference, 1999. Available at: https://www.onepetro.org/ (accessed 20 January 2017).
11. O’Neil B., Maley D. Prevention of acid-induced asphaltene precipitation: a comparison of anionic vs. cationic surfactants. Soc. Petrol. Eng, 2015, vol. 54 (1), p. 49-50.