Логин:
Пароль:
Регистрация
Забыли свой пароль?

Interpretation of logging data in horizontal wells: current status and future challenges

UDK: 550.832
DOI: 10.24887/0028-2448-2017-11-26-31
Key words: horizontal wells, optimal logging suite, quality of the data, uncertainties, standard and spatial interpretation, azimuth measurements, effective volume of the study, anisotropy, inversion of logging data
Authors: N.V. Shchetinina (TNNC LLC, RF, Tyumen), М.А. Basyrov, I.А. Zyryanova, V.М. Yatsenko, D.I. Ganichev, А.А. Bovykin (Rosneft Oil Company, RF, Moscow)

A number of horizontal and extended reach wells is increasing year by year, but meanwhile the quantitative interpretation of logging data is still doubtful. There is no understanding of limits of logging tools and necessity to sel ect the optimal logging suite for the certain geological and technological conditions. This work includes some examples which allowed to make a conclusion about the advantages of the logging during the drilling processes, to evaluate uncertainties appeared in case of application of logging interpretation results of poor quality in geological and flow simulation models. Also, the questions regarding the methodology of logging data interpretation in horizontal wells are discussed as well. The problem with evaluation of properties in case of measurements at small angles of intersection between the axis of horizontal well and reservoir boundaries is highlighted. This led to the apparent smearing of logging curves by the measured depth and apparent changes of reservoir properties. Examples of spatial interpretation of logging data are illustrated as well. This interpretation allows accounting the influence of enclosing rocks and sloping angle, based on the process of direct modelling – comparison – updating. This process provides the restoration of true logging curves and as a result, it is possible to specify the profile of porosity and water saturation, which gives the prerequisite for improving geological and flow simulation models. The advantages of application of the azimuthal measurements RHOB for interpretation of intervals in heterogeneous section – specifying the effective length of the reservoir, porosity of the clean sandstone are shown. The options for accounting the anisotropy by means of direct modelling of logging records (spatial interpretation), results of core studies in two planes (parallel and perpendicular to the layering)В  and measurements of triaxial induction logging are suggested. Further steps for improving the current techniques of integrated interpretation are considered.

References

1. Bruce S., Newberry B. et al., Down and out in logging, Middle East Well Evaluation Review, 1991, no. 11, pp. 33–49.

2. Jubralla A.F., Cosgrove P., Whyte S.J., Horizontal highlights, Middle East Well Evaluation Review, 1995, no. 16, pp. 7–25.

3. Allen D., Dennis B., Edwards J. et al., Modelling logs for horizontal well planning and evaluation, Oilfield Review, 1995, Winter, pp. 47–63.

4. Grifths R., Well placement fundamentals, Sugar Land, Texas, 2009, pp. 10.

5. Amer A., Chinellato F., Collins S. et al., Structural steering – A path to productivity, Oilfield Review, 2013, Spring, pp. 14–31.

6. Griffiths R., Morriss C., Ito K. et al., Formation evaluation in high angle and horizontal wells, A new and practical workflow, Proceedings of SPWLA 53rd Annual Logging Symposium, 2012, June16-20, pp. 1–16.

7. Valdisturlo A. et al., Improved petrophysical analysis in horizontal wells: fr om log modeling through formation evaluation to reducing model uncertainty, SPE 164881-MS, 2013.

8. URL: http://sis.slb.ru/upload/iblock/aa0/techlog_3d_petrophysics.pdf

9. URL: http://logxd.com/

10. Epov M.I., Sukhorukova K.V., Nikitenko M.N. et al., Electromagnetic sounding in deviated and horizontal wells: mathematical modeling and real data interpretation, SPE 162034, 2012.

11. Moran J.H., Gianzero S., Effects of formation anisotropy on resistivity-logging measurements, Geophysics 44, 1979, no. 7, pp. 1266–1286.

12. Shchetinina N.V., Mal’shakov A.V., Basyrov M.A., Zyryanova I.A., Problemy, sostoyanie i perspektivy razvitiya interpretatsii dannykh geofizicheskikh issledovaniy v gorizontal’nykh skvazhinakh Rossiyskoy Federatsii (Problems, condition and prospects for the development of interpretation of horizontal well logging data in the Russian Federation), Proceedings of EAGE scientific seminar “Gorizontal’nye skvazhiny. Problemy i perspektivy” (Horizontal wells. Problems and prospects), Moscow, 2015, pp. 1–13.

13. Shchetinina N.V., Mal’shakov A.V. et al., New approaches and technologies to interpreting logging data in horizontal wells (In Russ.), Nauchno-tekhnicheskiy Vestnik OAO “NK “Rosneft’”, 2016, no. 2, pp. 6–14.

A number of horizontal and extended reach wells is increasing year by year, but meanwhile the quantitative interpretation of logging data is still doubtful. There is no understanding of limits of logging tools and necessity to sel ect the optimal logging suite for the certain geological and technological conditions. This work includes some examples which allowed to make a conclusion about the advantages of the logging during the drilling processes, to evaluate uncertainties appeared in case of application of logging interpretation results of poor quality in geological and flow simulation models. Also, the questions regarding the methodology of logging data interpretation in horizontal wells are discussed as well. The problem with evaluation of properties in case of measurements at small angles of intersection between the axis of horizontal well and reservoir boundaries is highlighted. This led to the apparent smearing of logging curves by the measured depth and apparent changes of reservoir properties. Examples of spatial interpretation of logging data are illustrated as well. This interpretation allows accounting the influence of enclosing rocks and sloping angle, based on the process of direct modelling – comparison – updating. This process provides the restoration of true logging curves and as a result, it is possible to specify the profile of porosity and water saturation, which gives the prerequisite for improving geological and flow simulation models. The advantages of application of the azimuthal measurements RHOB for interpretation of intervals in heterogeneous section – specifying the effective length of the reservoir, porosity of the clean sandstone are shown. The options for accounting the anisotropy by means of direct modelling of logging records (spatial interpretation), results of core studies in two planes (parallel and perpendicular to the layering)В  and measurements of triaxial induction logging are suggested. Further steps for improving the current techniques of integrated interpretation are considered.

References

1. Bruce S., Newberry B. et al., Down and out in logging, Middle East Well Evaluation Review, 1991, no. 11, pp. 33–49.

2. Jubralla A.F., Cosgrove P., Whyte S.J., Horizontal highlights, Middle East Well Evaluation Review, 1995, no. 16, pp. 7–25.

3. Allen D., Dennis B., Edwards J. et al., Modelling logs for horizontal well planning and evaluation, Oilfield Review, 1995, Winter, pp. 47–63.

4. Grifths R., Well placement fundamentals, Sugar Land, Texas, 2009, pp. 10.

5. Amer A., Chinellato F., Collins S. et al., Structural steering – A path to productivity, Oilfield Review, 2013, Spring, pp. 14–31.

6. Griffiths R., Morriss C., Ito K. et al., Formation evaluation in high angle and horizontal wells, A new and practical workflow, Proceedings of SPWLA 53rd Annual Logging Symposium, 2012, June16-20, pp. 1–16.

7. Valdisturlo A. et al., Improved petrophysical analysis in horizontal wells: fr om log modeling through formation evaluation to reducing model uncertainty, SPE 164881-MS, 2013.

8. URL: http://sis.slb.ru/upload/iblock/aa0/techlog_3d_petrophysics.pdf

9. URL: http://logxd.com/

10. Epov M.I., Sukhorukova K.V., Nikitenko M.N. et al., Electromagnetic sounding in deviated and horizontal wells: mathematical modeling and real data interpretation, SPE 162034, 2012.

11. Moran J.H., Gianzero S., Effects of formation anisotropy on resistivity-logging measurements, Geophysics 44, 1979, no. 7, pp. 1266–1286.

12. Shchetinina N.V., Mal’shakov A.V., Basyrov M.A., Zyryanova I.A., Problemy, sostoyanie i perspektivy razvitiya interpretatsii dannykh geofizicheskikh issledovaniy v gorizontal’nykh skvazhinakh Rossiyskoy Federatsii (Problems, condition and prospects for the development of interpretation of horizontal well logging data in the Russian Federation), Proceedings of EAGE scientific seminar “Gorizontal’nye skvazhiny. Problemy i perspektivy” (Horizontal wells. Problems and prospects), Moscow, 2015, pp. 1–13.

13. Shchetinina N.V., Mal’shakov A.V. et al., New approaches and technologies to interpreting logging data in horizontal wells (In Russ.), Nauchno-tekhnicheskiy Vestnik OAO “NK “Rosneft’”, 2016, no. 2, pp. 6–14.



Attention!
To buy the complete text of article (a format - PDF) or to read the material which is in open access only the authorized visitors of the website can. .

Mobile applications

Read our magazine on mobile devices

Загрузить в Google play

Press Releases

05.03.2020
01.03.2020
25.02.2020