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1 7 5, -. Denis A. MARAKOV (born 1978) graduated from Gubkin Russian State University of Oil and Gas in He is Candidate of Technical Sciences, associate professor of the Department of Gas and Condensate Field Development and Operation at Gubkin Russian State University of Oil and Gas (National Research University). He is expert in the field of development and operation of oil and gas fields and author of more than 40 publications, including 7 monographs and 5 thematic brochures in the field of the theory of development, research and operation of vertical and horizontal wells. marakovdenis78@gmail.com 544.7:544.4: ,..,..,.. ( «-,, ,.,.,.,. 1 ) THE USE OF COLLOIDAL SILICA FOR WATER ISOLATION WHILE REPAIRING LOW-PERMEABILITY INTERVALS OF WELLS N.N.EFIMOV, V.I. NOZDRJA, V.U. RODNOVA, V.. JAKOVENKO (LLC «Research and Production Company «Spetsburmaterialy» , Moscow region, Zhukovsky, Gastello street, 1a, Russian Federation) ,,,.,, -. The physicochemical and technological properties of the gel-forming composition based on concentrated alkaline silica sol of Polygel ACM-KZ are studied. The results of the estimation of the kinetics of bulk gelling in the presence of cement stone, the strength of gels, the sealing, and frost resistance are presented. Oilfield tests of the composition showed high efficiency for eliminating intercasing pressure, behind-the-casing flow and leakage of the couplings. 4 (289)

2 :,, -, -. Keywords: silic sol, gelling kinetics, repair and insulation works. ( ) [1 5],. [6].. -, «in situ» [3, 7 9], [7, 8], - [10], - [12]..,,, [11, 13 15] ( ),.. -, « ( 1) SiO 2 25,7 %. - 1 ( ), / 3 1,2,. 9,5 10,5, 2 / 5,5, 8,0 10,0 SiO2, %. 30,0 56 ( )..

3 ( ), 2., I-G 1 ( / 0,44). - ( 3 5 ) 10,, 1%- Na 2 -, ( 20 ) : - [1, 21] [19, 20].,. (2 ) ,5 32,7. - 0,313 2., (25,7 % SiO 2, 0,3 % NaCl) - 23, ,012 / 3, -. - (R ). 2 ( ) ( ),.., % Flodrill AB 995 (SNF) 3 90 Magnafloc 611(BASF) 6 90 Praestol 2540 (Ashland) Magnafloc LT25(BASF) Magnafloc LT30 (BASF) Praestol 2620 (Ashland) (289)

4 , -. (, -, ) (, - ) -., [16], -., ( 1) NaCl ( : 25,7 % SiO2, 0,15 1,00 % NaCl) 58 ( )..

5 -. (25 90 ) - - : ln ( ) [ - ], (1). [16], - [17, 18]. - 0, , -, 12..,. -., - 80 ( 10 ). Na , 1%- Na Na 2 - ( - 3). 0,1 % Na % Na 2 - -, -, Na2-. (NaCl) 0,5 %, SiO2 25 % Na2-, %., , , , (289)

6 :,. 0,1 % Na , -, ( ),,,. 4 -, ( ), [19, 20]. 80, ,.,.,,. - [1, 21]. 40 7,5 % SiO 2 80 ( 2), 4 ( [19, 20]) - -,, Alcoflood 254S 2 % 0,5 % VEC-2 4 % 1 % DSGA 0,6 % 0,1 % l 0,5% NaCl 0,15 %, , 5 10 % 3,20 82,2, , 4, % 1,06 27, ,3 393,.. 60 ( )..

7 -., -. - [22, 23]. -, ,, ( 20 ), -. Praestol , SiO2 ( ) 3. - SiO2 30 % - - (0,05 % ), 24 25, 4 (289)

8 4. (30 % SiO2, - 7,5 ) - 25., ( - ).. HP-CFS , ( 10 5 ),.,., - ( 5). -. 5, - ( ),. 62 ( )..

9 R = 2686,8 FIR = 80 V /V 5. - (, 10 3 ),.. - ( 50 3 /24 10,0 ). - 5,,, % 2,33 0,48 1 2,35 0,38 3 2,25 4,05 4 2,25 4,05 6 2,4 2,45 7 2,33 0, ,33 0, ,33 0, ,5 6,36 2,34-10 ( 1 ) 2,2 6,41 : 2,6 %, 25,7 % SiO2, 10 % (289)

10 6,, 2013, 2013., 2013, ,, 2016, ,0 3-0,7 3-2,5 3-0,7 3 1,3 3-1, , - - -, -,,. 6., ( - «5» / 0,8; 0,8 % 1,5 % «-3») ,, , -,,,., , :, ( )..

11 2. Bergna H.E. Colloidal Silica. Fundamentals and Application/H.E. Bergna, W.O. Roberts. Boca Raton: Taylor and Francis, 2006, 895 p. 3...,... :., ,..,..,.. - // ,..,.. - // // Jurinak J.J., Summers L.E. Oilfield applications of colloidal silica gel//spe PA Lakatos I.J., Lakatos-Szabo J., Szentes G., Vago A., Karaffa Zs., Bodi T. New Alternatives in Conformance Control: Nanosilica and Liquid Polymer Aided Silicate Technology//SPE MS Robertson J.O., Oefelein F.O. Plugging Thief Zones in Water Injection Wells//SPE PA Kobayashi S., Soya M., Takeuchi N., Nobuto J., Nakaya A., T. Okuno T., Shimada S., Kaneto T., Maejima T. Rock Grouting and Durability Experiments of Colloidal Silica at Kurashiki Underground LPG Storage Base//ISRM-EUROCK ISRM Regional Symposium EU- ROCK 2014, May, Vigo, Spain. 11. Bennett K.E., Fitzjohn J.L., Harmon R.A. Colloidal silica based yeuid diversion. US Patent No , Agerbaek M.K., Gregersen S.H.H., Eriksen K., Noer J., Mulrooney M. Successful Closure of Zonal Sand Production / SPE MS Patil P., Kalgaonkar R. Environmentally Acceptable Compositions Comprising Nanomaterials for Plugging and Sealing Subterranean Formations//SPE MS Bøye B., Rygg A., Jodal C., Klungland I. Development and Evaluation of a New Environmentally Acceptable Conformance Sealant//SPE MS Vasquez J.E., Tuck D. Environmentally Acceptable Porosity-Fill Sealant Systems for Water and Gas Control Applications // SPE MS ,..,..,.. - // // :. -. : /., Petroleum and natural gas industries Field testing of drilling fluids. Part 1: Water-based fluids. International standard ISO Second Edition API 13B-1. Standard practice for field testing water-based drilling fluids. Second Edition, September : :.... : , Hatzignatiou D.G., Askarinezhad R., Giske N.H., Stavland A. Laboratory testing of environmentally friendly sodium silicate systems for water management through conformance control//spe , :...., (289)

12 REFERENCES 1. Shabanova N.A., Sarkisov P.D. Osnovy zol -gel tekhnologii nanodispersnogo kremnezema [Fundamentals of sol-gel nanosized silica technology]. Moscow, Akademkniga Publ., 2004, 208 p. 2. Bergna H.E. Colloidal Silica. Fundamentals and Application/H.E. Bergna, W.O. Roberts. Boca Raton: Taylor and Francis, 2006, 895 p. 3. Lozin E.V., Khlebnikov V.N. Primenenie kolloidnykh reagentov v neftedobyche [The use of colloidal reagents in oil production]. Ufa, Bashnipineft Publ., 2003, 236 p. 4. Krupin S.V., Biktimirova L.F., Suveid M.A., Adebaio A.A. Gidroizoliruiushchie ekrany na osnove polisilikata natriia dlia povysheniia nefteotdachi plastov [Waterproofing screens on the basis of sodium polysilicate for enhanced oil recovery]. Vestnik Kazanskogo tekhnologicheskogo universiteta, 2015, t. 18, no. 11, p Osipov P.V., Krupin S.V., Khisamov R.S. Ispol zovanie vysokomodul'nykh rastvorimykh stekol dlia uvelicheniia okhvata neftianogo plasta vozdeistviem [The use of high-modulus soluble glass to increase the oil reservoir coverage]. Izvestia vysshikh uchebnykh zavedenii. Neft i gaz, 2008, no. 1, p Savel ev A.A. Prichiny vodopritokov v skvazhinu i metody ih izoljacii [Causes of water inflows into the well and methods of their isolation]. Akademicheskij zhurnal Zapadnoj Sibiri, 2016, vol. 12, no. 2, p Jurlnak J.J., Summers L.E. Oilfield applications of colloidal silica gel. SPE PA, Society of Petroleum Engineers 1991, vol. 6, no. 4, p doi: /18505-PA, Lakatos I.J., Lakatos-Szabo J., Szentes G., Vago A., Karaffa Zs., Bodi T. New Alternatives in Conformance Control: Nanosilica and Liquid Polymer Aided Silicate Technology. SPE MS Robertson J.O., Oefelein F.O. Plugging Thief Zones in Water Injection Wells. SPE-1524-PA, Kobayashi S., Soya M., Takeuchi N., Nobuto J., Nakaya A., T. Okuno T., Shimada S., Kaneto T., Maejima T. Rock Grouting and Durability Experiments of Colloidal Silica at Kurashiki Underground LPG Storage Base. ISRM-EUROCK , ISRM Regional Symposium EUROCK 2014, May, Vigo, Spain. 11. Bennett K.E., Fitzjohn J.L., Harmon R.A. Colloidal silica based yeuid diversion. US Patent No , Agerbaek M.K., Gregersen S.H.H., Eriksen K., Noer J., Mulrooney M. Successful Closure of Zonal Sand Production. SPE MS, Patil P., Kalgaonkar R. Environmentally Acceptable Compositions Comprising Nanomaterials for Plugging and Sealing Subterranean Formations. SPE MS, doi: / MS. 14. Bøye B., Rygg A., Jodal C. Klungland I. Development and Evaluation of a New Environmentally Acceptable Conformance Sealant. SPE MS, MS. 15. Vasquez J.E., Tuck D. Environmentally Acceptable Porosity-Fill Sealant Systems for Water and Gas Control Applications. SPE MS, Nozdrja V.I., Efimov N.N., Rodnova V.Ju., Hlebnikov V.N. Zakonomernosti geleobrazovanija koncentrirovannogo zolja kremnievoj kisloty v prisutstvii natrievyh solej [Regularities of gelling of a concentrated silicic acid sol in the presence of sodium salts]. Bashkirskij himicheskij zhurnal. 2016, vol. 23, no. 4, p Hlebnikov V.N. Zakonomernosti geleobrazovanija v kislotnyh zoljah aljumosilikatov i silikatov [Regularities of gelling in acid sols of aluminosilicates and silicates] Trudy Rossijskogo gosudarstvennogo universiteta nefti i gaza imeni I.M. Gubkina, 2009, no. 2, p Hlebnikov V.N. Kolloidno-himicheskie processy v tehnologijah povyshenija nefteotdachi. Dokt, Diss. [Colloid-chemical processes in enhanced oil recovery technologies Doct. Diss.]. Kazan. 2005, 277 p. 19. Petroleum and natural gas industries Field testing of drilling fluids. Part 1: Water-based fluids. International standard ISO Second Edition ( )..

13 20. API 13B-1. Standard practice for field testing water-based drilling fluids. Second Edition, September Krupin S.V. Geli i studni v neftepromyslovom dele: metodicheskie ukazaniia [Gels and jellies in the oilfield industry: guidelines]. Kazan', KGTU Publ., 2008, 56 p. 22. Hatzignatiou D.G., Askarinezhad R., Giske N.H., Stavland A. Laboratory testing of environmentally friendly sodium silicate systems for water management through conformance control. SPE , Osipov P.V. Kolloidno-himicheskie osnovy tehnologii intensifikacii nefteizvlechenija iz plastov posredstvom polisilikatov natrija: Dis.kand. tehn. nauk [Colloid and chemical foundations of oil recovery intensification from reservoirs using sodium polysilicates. Dr. eng. sci. diss]. Kazan', KGTU Publ., 2008, 142 p , - « Nikolaj N. EFIMOV graduated from Gubkin Russian State University of Oil and Gas in He is Candidate of Technical Sciences, Head of the Laboratory of Materials and Technologies for Repairs and Insulation in Oil and Gas Wells at Spetsburmaterially Research and Production Company. He is specialist in the field of repair and insulation works and author of 35 scientific publications. efimovniknik@mail.ru , «- -., Vladimir I. NOZDRJA graduated from Moscow State University in He is Candidate of Geological and Mineralogical Sciences, General Director of Spetsburmaterially Research and Production Company. He is specialist in the field of geology and drilling. He is author of more than 200 scientific publications. npk@scsbm.ru ( ) ( ).., «- «-». Valentina Y. RODNOVA graduated from Gubkin Russian State University of Oil and Gas in She is engineer of the Laboratory of Materials and Technologies for Repairs and Insulation in Oil and Gas Wells at Spetsburmaterially Research and Production Company. valentinadinges@rambler.ru «-. Vitalij A. JAKOVENKO graduated from Kuban State Technical University in He is leading engineer of the Laboratory of Materials and Technologies for Repairs and Insulation in Oil and Gas Wells at Spetsburmaterially Research and Production Company. jakovenko@scsbm.ru 4 (289)