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Improvements in efficiency of water cut measurements for production wells

UDK: 622.276.5:53.08
DOI: 10.24887/0028-2448-2020-7-43-45
Key words: collection of samples for water cut measurements, automatic sampler, on-stream water cut meter, water cut measurements in production wells, water cut profile
Authors: V.S. Voronkov (Oil and Gas Production Department Leninogorskneft, RF, Leninigorsk), А.А. Galimov (Oil and Gas Production Department Leninogorskneft, RF, Leninigorsk), D.Yu. Samoylov (Research and Development Center Automation, Measurements, Engineering LLC, RF, Almetyevsk), А.V. Migachev (Research and Development Center Automation, Measurements, Engineering LLC, RF, Almetyevsk)
Determination of water cut of the fluid recovered from oil-producing wells is an inherent part of the whole field development process. A sampling device (or sampling cock) is used routinely to periodically collect wellhead samples into a receptacle for further measurements of the percent content of oil and water under laboratory conditions. In case of manual sampling, poor accuracy of analysis results obtained with samples from high-watercut wells is attributable to intrinsic disadvantages of this method: recovery of fluid samples only through one sampling point of the pipeline, low sampling rates, and adverse effects of human factor. For these reasons, periodic manual sampling cannot provide reliable data on the actual water content of the wellstream (particularly, in case of high water cut) and impedes timely response to optimize the operations. Hence, implementation of new water cut determination methods for production wells is of utmost importance. The paper considers promising innovative methods for determination of water cut of production wells using a portable on-stream watercut meter. The authors present the results of water cut studies using this watercut meter and the automatic sampler in a production well characterized by wide variations in water cut measurement results obtained for manually collected samples. Best practices in improving the accuracy and decreasing the expenses on water cut measurements are also reviewed. References 1. Vosproizvodstvo mineral'no-syr'evoy bazy, vklyuchayushchee poiski i razvedku novykh mestorozhdeniy neftyanykh i gazovykh iskopaemykh dlya nuzhd narodnogo khozyaystva (The reproduction of the mineral resource base, including the search and exploration of new deposits of oil and gas minerals for the needs of the national economy), URL: http://www.gkz-rf.ru/index.php?option=com_content&view=article&id=229:2015-04-21-07-53-31&catid=53:docsuvs&Itemid=70 2. Patent RU 2453689 C1, Oil deposit development method, Inventors: Khisamov R.S., Khamidullin M.M., Shaydullin R.G., Galimov I.F., Vanyurikhin I.S., Galiev F.A. 3. Chudin V.I., Ushkov P.V., Shatalov V.A., Zhilyaev O.V., O dostovernosti opredeleniya obvodnennosti produktsii, dobytoy iz neftyanoy skvazhiny, po probe (On the reliability of determining the water cut of products extracted from an oil well by sample), Collected papers “Aktual'nye voprosy metrologicheskogo obespecheniya izmereniy, raskhoda i kolichestva zhidkostey i gazov” (Actual issues of metrological support of measurements, flow rate and amount of liquids and gases), Proceedings of III international metrology conference, Kazan': Mir bez granits Publ., 2015, pp. 42–45. 4. Levin K.A., Tonkonog M.I., Chudin V.I. et al., O rezul'tatakh issledovaniy otkloneniya predstavitel'nosti proby, otobrannoy probootbornikami PORT (On the results of studies on the deviation of representativeness of a sample taken by PORT samplers), Collected papers “Aktual'nye voprosy metrologicheskogo obespecheniya izmereniy, raskhoda i kolichestva zhidkostey i gazov” (Actual issues of metrological support of measurements, flow rate and amount of liquids and gases), Proceedings of III international metrology conference, Kazan': Mir bez granits Publ., 2015, pp. 46–47. 5. Chudin V.I., Obvodnennost' – reshenie ee opredeleniya po probe (Water cut – the solution of its determination by sample), Collected papers “Aktual'nye voprosy metrologicheskogo obespecheniya izmereniy, raskhoda i kolichestva zhidkostey i gazov” (Actual issues of metrological support of measurements, flow rate and amount of liquids and gases), Proceedings of II international metrology conference, Kazan': Mir bez granits Publ., 2014, pp. 40–41. 6. Chudin V.I., Ushkov P.V., Nurmukhametov R.R., Beloklokov V.V., Obzor probootbornikov syroy nefti, razrabotannykh v OOO “NPO “NTES” (Overview of Crude Oil Samplers Developed by NTES NPO LLC), Collected papers “Aktual'nye voprosy metrologicheskogo obespecheniya izmereniy, raskhoda i kolichestva zhidkostey i gazov” (Actual issues of metrological support of measurements, flow rate and amount of liquids and gases), Proceedings of I international metrology conference, Kazan': Mir bez granits Publ., 2015, pp.20–23.
Determination of water cut of the fluid recovered from oil-producing wells is an inherent part of the whole field development process. A sampling device (or sampling cock) is used routinely to periodically collect wellhead samples into a receptacle for further measurements of the percent content of oil and water under laboratory conditions. In case of manual sampling, poor accuracy of analysis results obtained with samples from high-watercut wells is attributable to intrinsic disadvantages of this method: recovery of fluid samples only through one sampling point of the pipeline, low sampling rates, and adverse effects of human factor. For these reasons, periodic manual sampling cannot provide reliable data on the actual water content of the wellstream (particularly, in case of high water cut) and impedes timely response to optimize the operations. Hence, implementation of new water cut determination methods for production wells is of utmost importance. The paper considers promising innovative methods for determination of water cut of production wells using a portable on-stream watercut meter. The authors present the results of water cut studies using this watercut meter and the automatic sampler in a production well characterized by wide variations in water cut measurement results obtained for manually collected samples. Best practices in improving the accuracy and decreasing the expenses on water cut measurements are also reviewed. References 1. Vosproizvodstvo mineral'no-syr'evoy bazy, vklyuchayushchee poiski i razvedku novykh mestorozhdeniy neftyanykh i gazovykh iskopaemykh dlya nuzhd narodnogo khozyaystva (The reproduction of the mineral resource base, including the search and exploration of new deposits of oil and gas minerals for the needs of the national economy), URL: http://www.gkz-rf.ru/index.php?option=com_content&view=article&id=229:2015-04-21-07-53-31&catid=53:docsuvs&Itemid=70 2. Patent RU 2453689 C1, Oil deposit development method, Inventors: Khisamov R.S., Khamidullin M.M., Shaydullin R.G., Galimov I.F., Vanyurikhin I.S., Galiev F.A. 3. Chudin V.I., Ushkov P.V., Shatalov V.A., Zhilyaev O.V., O dostovernosti opredeleniya obvodnennosti produktsii, dobytoy iz neftyanoy skvazhiny, po probe (On the reliability of determining the water cut of products extracted from an oil well by sample), Collected papers “Aktual'nye voprosy metrologicheskogo obespecheniya izmereniy, raskhoda i kolichestva zhidkostey i gazov” (Actual issues of metrological support of measurements, flow rate and amount of liquids and gases), Proceedings of III international metrology conference, Kazan': Mir bez granits Publ., 2015, pp. 42–45. 4. Levin K.A., Tonkonog M.I., Chudin V.I. et al., O rezul'tatakh issledovaniy otkloneniya predstavitel'nosti proby, otobrannoy probootbornikami PORT (On the results of studies on the deviation of representativeness of a sample taken by PORT samplers), Collected papers “Aktual'nye voprosy metrologicheskogo obespecheniya izmereniy, raskhoda i kolichestva zhidkostey i gazov” (Actual issues of metrological support of measurements, flow rate and amount of liquids and gases), Proceedings of III international metrology conference, Kazan': Mir bez granits Publ., 2015, pp. 46–47. 5. Chudin V.I., Obvodnennost' – reshenie ee opredeleniya po probe (Water cut – the solution of its determination by sample), Collected papers “Aktual'nye voprosy metrologicheskogo obespecheniya izmereniy, raskhoda i kolichestva zhidkostey i gazov” (Actual issues of metrological support of measurements, flow rate and amount of liquids and gases), Proceedings of II international metrology conference, Kazan': Mir bez granits Publ., 2014, pp. 40–41. 6. Chudin V.I., Ushkov P.V., Nurmukhametov R.R., Beloklokov V.V., Obzor probootbornikov syroy nefti, razrabotannykh v OOO “NPO “NTES” (Overview of Crude Oil Samplers Developed by NTES NPO LLC), Collected papers “Aktual'nye voprosy metrologicheskogo obespecheniya izmereniy, raskhoda i kolichestva zhidkostey i gazov” (Actual issues of metrological support of measurements, flow rate and amount of liquids and gases), Proceedings of I international metrology conference, Kazan': Mir bez granits Publ., 2015, pp.20–23.


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