Electrical and electromagnetic logging is the main methods for estimating hydrocarbon saturation index, as well as for geo-steering horizontal and directional wells. Determination of the specific electrical resistance in horizontal wells sets new tasks for the development of the theory of mathematical and software, interpretation techniques and equipment creation. When drilling wells in a given reservoir, it is necessary to control the trajectory of the wellbore and obtain information on the lithological features of the opened interval. This allows you to promptly adjust the direction of drilling a well.
Electrical logging was carried out in directional and horizontal wells using the AMK Horizont, Horizontal, Rigid Cable technologies. The log data analysis showed that the influence of the limited thickness of the reservoir and the position of the trajectory of the borehole axis relative to the underlying and covering rocks can lead to errors in determining specific electrical resistance. In vertical wells the model of resistivity section is practically known, horizontal well profile relative to the boundaries of the horizontal formation is not well known.
The article considers the features of determining the specific electrical resistance in conditions of horizontal wells. A brief analysis of the current state of the issue is given. Mathematical modeling of electrical logging has been carried out. We showed that it is necessary to take into account the influence of underlying and covering rocks in the interpretation of horizontal well logging data. An algorithm and software for determining the specific electrical resistance and results of interpretation are presented.
References
1. Antonov Yu.N., Epov M.I., Kayurov K.N., Practice of high-frequency induction log isoparametric sounding in horizontal wells with salt biopolymer solutions (In Russ.), Karotazhnik, 2006, no. 9(150), pp. 3–21.
2. Dvorkin V.I., Metelkin V.I., Tsaregorodtsev A.A. et al., Borehole investigations while drilling by induction logging technique (In Russ.), Karotazhnik, 2005,no. 10-11, pp. 95–105.
3. Kayurov K.N., Eremin V.N., Epov M.I. et al., Electromagnetic-logging-while-drilling equipment and numerical inversion software (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 12, pp. 112–115.
4. Legotin L.G., Effective application of multiple sonde electrical logging for horizontal well and side-track wireline survey (In Russ.), Neft'. Gaz. Novatsii, 2013, no. 12, pp. 29–33.
5. Potapov A.P., Sudnichnikov V.G., Sudnichnikov A.V., Chuprov V.P., Capabilities of induction logging by transition processes method for borehole drilling control (In Russ.), Karotazhnik, 2011, no. 5(203), pp. 33–44.
6. Rudyak B.V., Snezhko O.M., Shein Yu.L., Testing a self-contained dual laterolog tool BK-35A in horizontal boreholes (In Russ.), Karotazhnik, 2009, no. 10(187), pp. 12–25.
7. Epov M.I., Nikitenko M.N., Sukhorukova K.V., Studies on capabilities of electric and electromagnetic logs in electrically macroanisotropic formations exposed by inclined horizontal boreholes (In Russ.), Karotazhnik, 2016, no. 2(260), pp. 64–79.
8. Epov M.I., Nikitenko M.N., Glinskikh V.N., Sukhorukova K.V., Numerical simulation and analysis of electromagnetic log responses while drilling (In Russ.), Karotazhnik, 2014, no. 11(245), pp. 29–42.
9. Cheryahe A.B., Zhdanov M., Fast modeling of a tensor induction toll response in horizontal well in homogeneous anisotropic formations, Petrophysics, 2001, V. 42, no. 2, p. 158.
10. Mach S.G., Wisler M., Wu J.Q., The design response and field results of a new slim hole LWD multiple frequency resistivity propagation tool, SPE 77483, 2002.
11. Sukhorukova K.V., Arzhantsev V.S., Surodina I.V., Nechaev O.V., The results of numerical simulation of lateral logging sounding responses from a self-contained SKL tool (In Russ.), Karotazhnik, 2015, no. 1 (247), pp. 58–72.
12. Mikhaylov N.N., Informatsionno-tekhnologicheskaya geodinamika okoloskvazhinnykh zon (Information technology geodynamics of boreholes zones), Moscow: Nedra Publ., 1996, 349 p.
13. Verzhbitskiy V.V., Ruchkin A.V., Chaadaev E.V., Influence of azimuthal inhomogeneity of the penetration zone on the results of electrical and induction logging (In Russ.), Izvestiya vuzov. Geologiya i razvedka, 1989, no. 2, pp. 87–93.
14. Potapov A.P., Opredelenie udel'nogo elektricheskogo soprotivleniya v GS na osnove komp'yuternogo modelirovaniya (Determination of electrical resistivity in horizontal wells based on computer simulation), Proceedings of EAGE International Conference and Exhibition, Tyumen, 2-5 March 2009.
15. Kneller L.E., Potapov A.P., Reservoir rock resistivity studies while lateral and vertical heterogeneity (In Russ.), Geofizika, 2010, no. 1, pp. 52–65.
