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A novel water shut-off technique for horizontal wells at fields with hard-to-recover oil reserves

UDK: 622.276.7:622.245.67
DOI: 10.24887/0028-2448-2017-5-44-47
Key words: horizontal well, water-producing interval, water shut-off composition, polyacrylamide, geological model, reservoir simulation, dual porosity, dual permeability, tracer injection, reservoir fracture network, capital investments
Authors: R.R. Kadyrov (Branch of Ufa State Petroleum Technological University in Oktyabrsky, RF, Oktyabrsky), R.Kh. Nizaev, A.F. Yartiev (TatNIPIneft, RF, Bugulma), V.V. Mukhametshin (Ufa State Petroleum Technological University, RF, Ufa)

The paper presents a new technique designed to control unwanted water production in open-hole sections of horizontal production wells targeting carbonate reservoirs. It consists in water shut-off treatments with coiled tubing conducted through a supplementary horizontal hole drilled below and parallel to the main horizontal (water producing) wellbore to form a rigid water barrier using polyaluminumchloride and polyacrylamide. These water shut-off stages are also discussed in this paper.

The existing geological model presents a typical Bashkirian reservoir production zone. It was used to create a three-dimensional numerical flow model, which not only contained geological model parameters but also described in situ fluid dynamics. For the purposes of reservoir simulation study, the main horizontal wellbore located in the upper portion of the production zone was as summed to be 324 m long, while the length of the supplementary wellbore located in the water-oil zone was assumed to be 375 m. Over the course of reservoir simulation, it was taken into account that tracer (water shut-off composition) injection resulted in relative permeability changes in the order of 0.1 to 1 times depending on tracer concentration. This is attributable to water phase mobility changes.В  If no tracer is presenting model grid blocks, water phase mobility does not change. Otherwise, if a grid block is filled with tracer, particularly in the vicinity of the supplementary wellbore, water phase mobility reduces 10 times. Simulation data on tracer distribution in situ are reviewed for three simulation cases: 1) perforations around the horizontal wellbore – tracer distribution while flowing towards the production well is negligible; 2) water shut-off treatments in the upper portion of the horizontal wellbore – tracer covers a larger reservoir area compared to the previous case; 3) water shut-off treatments in the upper and side portion of the horizontal wellbore – reservoir coverage with tracer (water shut-off composition) is much more considerable compared to the previous cases. According to reservoir simulations conducted to study water-oil ratio versus tracer injection rate, the optimal injection rate for the tracer is within 0.5-1 m3/d. Numerical studies suggest that natural fracture network should also be considered during treatments. Economic assessment of further Bashkirian reservoir production performance using horizontal wells and tracer injection from the existing well is favorable.

References

1. Kadyrov R.R., Remontno-izolyatsionnye raboty v skvazhinakh s ispol'zovaniem polimernykh materialov (Well isolation squeeze using polymeric materials), Kazan': Fen Publ., 2007, 423 p.

2. Khakimzyanov I.N., Khisamov R.S., Bakirov I.M. et al., Voprosy optimizatsii i povysheniya effektivnosti ekspluatatsii skvazhin s gorizontal'nym okonchaniem na osnove matematicheskogo modelirovaniya mestorozhdeniy Tatarstana (Problems of optimization and increase the effectiveness of operation of wells with horizontal completion on the basis of mathematical modeling of Tatarstan fields), Kazan': Fen Publ., 2014, 239 p.

3. Patent no. 2597220 RF MPK E 21 V 43/32, E 21 V 33/138, Method for isolation of water flow in open horizontal section producing wells, Inventors: Evdokimov A.M., Nizaev R.Kh., Novikov I.M., Bakirov I.M., Kadyrov R.R., Khasanova D.K.

4. Khisamov R.S., Ibatullin R.R., Nikiforov A.I. et al., Teoriya i praktika modelirovaniya razrabotki neftyanykh mestorozhdeniy v razlichnykh geologo-fizicheskikh usloviyakh (Theory and practice of modeling the development of oil fields in various geological and physical conditions), Kazan': Fen Publ., 2009, 239 p.

5. Yartiev A.F., Ekonomicheskaya otsenka proektnykh resheniy pri razrabotke neftyanykh mestorozhdeniy dlya pozdney stadii ekspluatatsii (Economic evaluation of design decisions in the development of oil fields for the late stage of operation), Moscow: Publ. ofВ  VNIIOENG, 2006, 160 p.

6.В  Yartiev A.F., Ekonomicheskaya otsenka proektnykh resheniy innovatsionno-investitsionnykh vlozheniy dlya neftyanoy promyshlennosti (Economic evaluation of design solutions for innovative investment investments for the oil industry), Moscow: Publ. ofВ  VNIIOENG, 2011, 232 p.

7. Yartiev A.F., Yurkov D.V., Safiullin M.A., Tufetulov A.M., Nalogooblozhenie neftedobyvayushchey promyshlennosti: istoriya i perspektiva (Taxation of the oil industry: history and perspective), Kazan':В  Publ. of KSU, 2015, 164 p.

8. Federal Law no. 401-FZ from 30.11.16 “O vnesenii izmeneniy v chasti pervuyu i vtoruyu Nalogovogo kodeksa Rossiyskoy Federatsii i otdel'nye zakonodatel'nye akty Rossiyskoy Federatsii” (On amendments to parts one and two of the Tax Code of the Russian Federation and Certain Legislative acts of the Russian Federation).

The paper presents a new technique designed to control unwanted water production in open-hole sections of horizontal production wells targeting carbonate reservoirs. It consists in water shut-off treatments with coiled tubing conducted through a supplementary horizontal hole drilled below and parallel to the main horizontal (water producing) wellbore to form a rigid water barrier using polyaluminumchloride and polyacrylamide. These water shut-off stages are also discussed in this paper.

The existing geological model presents a typical Bashkirian reservoir production zone. It was used to create a three-dimensional numerical flow model, which not only contained geological model parameters but also described in situ fluid dynamics. For the purposes of reservoir simulation study, the main horizontal wellbore located in the upper portion of the production zone was as summed to be 324 m long, while the length of the supplementary wellbore located in the water-oil zone was assumed to be 375 m. Over the course of reservoir simulation, it was taken into account that tracer (water shut-off composition) injection resulted in relative permeability changes in the order of 0.1 to 1 times depending on tracer concentration. This is attributable to water phase mobility changes.В  If no tracer is presenting model grid blocks, water phase mobility does not change. Otherwise, if a grid block is filled with tracer, particularly in the vicinity of the supplementary wellbore, water phase mobility reduces 10 times. Simulation data on tracer distribution in situ are reviewed for three simulation cases: 1) perforations around the horizontal wellbore – tracer distribution while flowing towards the production well is negligible; 2) water shut-off treatments in the upper portion of the horizontal wellbore – tracer covers a larger reservoir area compared to the previous case; 3) water shut-off treatments in the upper and side portion of the horizontal wellbore – reservoir coverage with tracer (water shut-off composition) is much more considerable compared to the previous cases. According to reservoir simulations conducted to study water-oil ratio versus tracer injection rate, the optimal injection rate for the tracer is within 0.5-1 m3/d. Numerical studies suggest that natural fracture network should also be considered during treatments. Economic assessment of further Bashkirian reservoir production performance using horizontal wells and tracer injection from the existing well is favorable.

References

1. Kadyrov R.R., Remontno-izolyatsionnye raboty v skvazhinakh s ispol'zovaniem polimernykh materialov (Well isolation squeeze using polymeric materials), Kazan': Fen Publ., 2007, 423 p.

2. Khakimzyanov I.N., Khisamov R.S., Bakirov I.M. et al., Voprosy optimizatsii i povysheniya effektivnosti ekspluatatsii skvazhin s gorizontal'nym okonchaniem na osnove matematicheskogo modelirovaniya mestorozhdeniy Tatarstana (Problems of optimization and increase the effectiveness of operation of wells with horizontal completion on the basis of mathematical modeling of Tatarstan fields), Kazan': Fen Publ., 2014, 239 p.

3. Patent no. 2597220 RF MPK E 21 V 43/32, E 21 V 33/138, Method for isolation of water flow in open horizontal section producing wells, Inventors: Evdokimov A.M., Nizaev R.Kh., Novikov I.M., Bakirov I.M., Kadyrov R.R., Khasanova D.K.

4. Khisamov R.S., Ibatullin R.R., Nikiforov A.I. et al., Teoriya i praktika modelirovaniya razrabotki neftyanykh mestorozhdeniy v razlichnykh geologo-fizicheskikh usloviyakh (Theory and practice of modeling the development of oil fields in various geological and physical conditions), Kazan': Fen Publ., 2009, 239 p.

5. Yartiev A.F., Ekonomicheskaya otsenka proektnykh resheniy pri razrabotke neftyanykh mestorozhdeniy dlya pozdney stadii ekspluatatsii (Economic evaluation of design decisions in the development of oil fields for the late stage of operation), Moscow: Publ. ofВ  VNIIOENG, 2006, 160 p.

6.В  Yartiev A.F., Ekonomicheskaya otsenka proektnykh resheniy innovatsionno-investitsionnykh vlozheniy dlya neftyanoy promyshlennosti (Economic evaluation of design solutions for innovative investment investments for the oil industry), Moscow: Publ. ofВ  VNIIOENG, 2011, 232 p.

7. Yartiev A.F., Yurkov D.V., Safiullin M.A., Tufetulov A.M., Nalogooblozhenie neftedobyvayushchey promyshlennosti: istoriya i perspektiva (Taxation of the oil industry: history and perspective), Kazan':В  Publ. of KSU, 2015, 164 p.

8. Federal Law no. 401-FZ from 30.11.16 “O vnesenii izmeneniy v chasti pervuyu i vtoruyu Nalogovogo kodeksa Rossiyskoy Federatsii i otdel'nye zakonodatel'nye akty Rossiyskoy Federatsii” (On amendments to parts one and two of the Tax Code of the Russian Federation and Certain Legislative acts of the Russian Federation).


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