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Experience of oriented hydraulic refracturing in the oil fields of LCC “LUKOIL-PERM”

UDK: 622.276.66 НГ
DOI: 10.24887/0028-2448-2017-8-94-98
Key words: hydraulic fracture, geomechanics, major and minor horizontal stresses, monitoring
Authors: Yu.A. Kashnikov, S.G. Ashichmin, A.E. Kukhtinskii (Perm National Research Polytechnic University, RF, Perm), S.S. Cherepanov, T.R. Baldina (LUKOIL-PERM LCC, RF, Perm)

The results of pilot oriented hydraulic re-fracturing of two wells in the oil fields in the South of Perm region are presented. Generally the idea of oriented hydraulic re-fracturing is to create a system of perforations or lateral radial boreholes in a reservoir oriented perpendicular to the initial fracture and in a vertical plane. The distance between boreholes is determined based on geomechanical calculations. The technology of calculations comes down to the determination of the distance between small lateral boreholes depending on the existing geomechanical conditions and the in-situ stress which will allow the interaction of the boreholes and the subsequent creation of a fracture between them. Also the distance between two fracture systems created using lateral boreholes is determined to allow the propagation of the main fracture through the whole section. In connection with this the thorough study of reservoir geomechanical properties, in-situ stress near the considered wells and the initial hydraulic fracturing results was carried out before performing the oriented re-fracturing treatment. The stress field around the well should have a relatively small anisotropy (ratio more than 0.8 and meet the requirements for the vertical fracture formation). The azimuth of the initial fracture must be clearly known. Additional (highly desirable) condition is that the minimum initial fracture opening width should be no less than 10 mm near the wellbore.

The results of full-wave acoustic logging confirm that during some stages the fracture propagated in the predetermined direction.

References

1. Latypov I.D., Borisov G.A., Khaydar A.N. et al., Reorientation refracturing on RN-Yuganskneftegaz LLC oilfields (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2011, no. 6, pp. 34–38.

2. Latypov I.D., Fedorov A.I., Nikitin A.A., Research of reorientation refracturing (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2013, no. 10, pp. 74–78.

3. Wright S.A., Conant R.A., Stewart D.W., Byerly P.M., Reorientation of propped refracure treatments, Rock Mechanics in Petroleum Engineering, 1994, August, pp. 29-31.

4. Liu H., Lan Z., Zhang G. et.al., Evaluation of refracure reorientation in both laboratory and field scales, SPE 112445, 2008.

5. Wegner J., Hagemann B., Ganzer L., Numerical analysis of parameters affecting hydraulic fracture re-orientation in tight gas reservoirs, Proceedings of the 3rd Sino-German Conference "Underground Storage of CO2 and Energy", Goslar, Germany, 21–23 May 2013, pp. 117–130.

6. Mikhin A.S., Improvement of hydraulic fracturing technology for the purpose of involve to production not drained zone of layered non-uniform low permeability reservoir (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2013, no. 9, pp. 50–52.

7. Kashnikov Yu.A., Ashikhmin S.G., Smetannikov O.Yu., Shustov D.V., Geomechanics research of oriented refracturing development conditions (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 6, pp. 44–47.

8. Kashnikov Yu.A., Ashikhmin S.G., Cherepanov S.S. et al., Experience of oriented hydraulic fracture creation at oil fields of LUKOIL-PERM LCC (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 6, pp. 40 –43.

9. Kashnikov Yu.A., Shustov D.V., Kukhtinskiy A.E., Kondrat'ev S.A., Geomechanical properties of the terrigenous reservoirs in the oil fields of Western Ural (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2017, no. 4, pp. 32–35.

The results of pilot oriented hydraulic re-fracturing of two wells in the oil fields in the South of Perm region are presented. Generally the idea of oriented hydraulic re-fracturing is to create a system of perforations or lateral radial boreholes in a reservoir oriented perpendicular to the initial fracture and in a vertical plane. The distance between boreholes is determined based on geomechanical calculations. The technology of calculations comes down to the determination of the distance between small lateral boreholes depending on the existing geomechanical conditions and the in-situ stress which will allow the interaction of the boreholes and the subsequent creation of a fracture between them. Also the distance between two fracture systems created using lateral boreholes is determined to allow the propagation of the main fracture through the whole section. In connection with this the thorough study of reservoir geomechanical properties, in-situ stress near the considered wells and the initial hydraulic fracturing results was carried out before performing the oriented re-fracturing treatment. The stress field around the well should have a relatively small anisotropy (ratio more than 0.8 and meet the requirements for the vertical fracture formation). The azimuth of the initial fracture must be clearly known. Additional (highly desirable) condition is that the minimum initial fracture opening width should be no less than 10 mm near the wellbore.

The results of full-wave acoustic logging confirm that during some stages the fracture propagated in the predetermined direction.

References

1. Latypov I.D., Borisov G.A., Khaydar A.N. et al., Reorientation refracturing on RN-Yuganskneftegaz LLC oilfields (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2011, no. 6, pp. 34–38.

2. Latypov I.D., Fedorov A.I., Nikitin A.A., Research of reorientation refracturing (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2013, no. 10, pp. 74–78.

3. Wright S.A., Conant R.A., Stewart D.W., Byerly P.M., Reorientation of propped refracure treatments, Rock Mechanics in Petroleum Engineering, 1994, August, pp. 29-31.

4. Liu H., Lan Z., Zhang G. et.al., Evaluation of refracure reorientation in both laboratory and field scales, SPE 112445, 2008.

5. Wegner J., Hagemann B., Ganzer L., Numerical analysis of parameters affecting hydraulic fracture re-orientation in tight gas reservoirs, Proceedings of the 3rd Sino-German Conference "Underground Storage of CO2 and Energy", Goslar, Germany, 21–23 May 2013, pp. 117–130.

6. Mikhin A.S., Improvement of hydraulic fracturing technology for the purpose of involve to production not drained zone of layered non-uniform low permeability reservoir (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2013, no. 9, pp. 50–52.

7. Kashnikov Yu.A., Ashikhmin S.G., Smetannikov O.Yu., Shustov D.V., Geomechanics research of oriented refracturing development conditions (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 6, pp. 44–47.

8. Kashnikov Yu.A., Ashikhmin S.G., Cherepanov S.S. et al., Experience of oriented hydraulic fracture creation at oil fields of LUKOIL-PERM LCC (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 6, pp. 40 –43.

9. Kashnikov Yu.A., Shustov D.V., Kukhtinskiy A.E., Kondrat'ev S.A., Geomechanical properties of the terrigenous reservoirs in the oil fields of Western Ural (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2017, no. 4, pp. 32–35.


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