Forecasting risks of overpressured zones by combining well tests, geomechanical and reservoir simulation

UDK: 622.276.1/.4.001.57
DOI: 10.24887/0028-2448-2019-6-66-70
Key words: fracturing initiated by injection, geomechanical and hydrodynamical model, injection-initiated fracture growth tragectory simulator, well testing
Authors: D.S. Ivaschenko (RN-BashNIPIneft LLC, RF, Ufa), Yu.O. Bobreneva (RN-BashNIPIneft LLC, RF, Ufa), I.R. Gimranov (RN-BashNIPIneft LLC, RF, Ufa), A.Ya. Davletbaev (RN-BashNIPIneft LLC, RF, Ufa), A.V. Sergeychev (Rosneft Oil Company, RF, Moscow), G.A. Shchutsky (RN-Yuganskneftegas LLC, RF, Nefteyugansk)

Injection initiated fractures occur into low-permeability reservoirs when ‘closure’ pressure threshold is exceeded. This effect may cause risks of gas, oil, and water shows due to anomalously high reservoir pressure while sidetracking. Thus, while planning sidetracks, problems of analyzing and forecasting risks of overpressured zones due to fracturing initiated by injection have to be solved along with reservoir pressure monitoring. The article presents some field case studies of approbation of Rosneft’s tools for simulating injection initiated fractures. The classification of cases of injected water breakthrough along the fractures is suggested. The description of the injection initiated fracturing simulator and the method for forecasting overpressured zones for a target bed are adduced. The simulator combines hydrodynamical and geomechanical solvers to calculate a fracture’s trajectory and increment. It is noted that additional auxiliary information (results of well testing, field geophysical surveys, drilling history, etc.) should be taken into account and the workflow algorithm for forecasting risks of overpressured zones at sidetrack’s path is suggested. The example for forecasting overpressured zones for a non-target (overlying) bed by means of a specialized corporate software module is also considered. The above-mentioned corporate tools are already usable in order to increase success of sidetracking operations.

References

1. Mal'tsev V.V., Asmandiyarov R.N., Baykov V.A. et al., Testing of auto hydraulic-fracturing growth of the linear oilfield development system of Priobskoye oil field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2012, no. 5, pp. 70–73.

2. Baykov V.A., Davletbaev A.Ya., Usmanov T.S., Stepanova Z.Yu., Special well tests to fractured water injection wells (In Russ.), Neftegazovoe delo, 2011, no. 1, pp. 65–75, URL: http://ogbus.ru/files/ogbus/authors/Baikov/Baikov_1.pdf

3. Davletbaev A.Ya., Baykov V.A., Ozkan E. et al., Multi-layer steady-state injection test with higher bottomhole pressure than the formation fracturing pressure (In Russ.), SPE 136199-RU, 2010, https://doi.org/10.2118/136199-RU.

4. Davletbaev A.Ya., Baykov V.A., Bikbulatova G.R. et al., Field studies of spontaneous growth of induced fractures in injection wells (In Russ.), SPE 171232-RU, 2014, https://doi.org/10.2118/171232-RU.

5. Makhota N.A., Davletbaev A.Ya., Fedorov A.I. et al., Examples of mini-frac test data interpretation in low-permeability reservoir (In Russ.), SPE 171175-RU, 2014, https://doi.org/10.2118/171175-RU.

6. Fedorov A.I., Davletova A.R., Kolonskikh A.V., Toropov K.V., Justification of the necessity to consider the effects of changes in the formation stress state in the low permeability reservoirs development (In Russ.), Nauchno-tekhnicheskiy vestnik OAO “NK “Rosneft'”, 2013, no. 2(31), pp. 25–29.

7. Fedorov A.I., Davletova A.R., Reservoir stress state simulator for determining of fracture growth direction (In Russ.), Geofizicheskie issledovaniya = Geophysical research, 2014, V. 15, no. 1, pp. 15–26.

8. Ivashchenko D.S., Sayfullin I.F., Fedorov A.I., Khabirov S.S., Simulation of auto fracturing cracks in zones of drilling lateral horizontal wellbore (In Russ.), Proceedings of International Scientific and Practical Conference “Gorizontal'nye skvazhiny i GRP v povyshenii effektivnosti razrabotki neftyanykh mestorozhdeniy” (Horizontal wells and hydraulic fracturing in improving the efficiency of oil field development), Kazan', 2017, pp. 184–186.

9. Davletova A.R., Fedorov A.I., Shchutskiy G.A., Self-induced hydraulic fracture growth in vertical plane (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2019, no. 6., pp. 50-53.

Injection initiated fractures occur into low-permeability reservoirs when ‘closure’ pressure threshold is exceeded. This effect may cause risks of gas, oil, and water shows due to anomalously high reservoir pressure while sidetracking. Thus, while planning sidetracks, problems of analyzing and forecasting risks of overpressured zones due to fracturing initiated by injection have to be solved along with reservoir pressure monitoring. The article presents some field case studies of approbation of Rosneft’s tools for simulating injection initiated fractures. The classification of cases of injected water breakthrough along the fractures is suggested. The description of the injection initiated fracturing simulator and the method for forecasting overpressured zones for a target bed are adduced. The simulator combines hydrodynamical and geomechanical solvers to calculate a fracture’s trajectory and increment. It is noted that additional auxiliary information (results of well testing, field geophysical surveys, drilling history, etc.) should be taken into account and the workflow algorithm for forecasting risks of overpressured zones at sidetrack’s path is suggested. The example for forecasting overpressured zones for a non-target (overlying) bed by means of a specialized corporate software module is also considered. The above-mentioned corporate tools are already usable in order to increase success of sidetracking operations.

References

1. Mal'tsev V.V., Asmandiyarov R.N., Baykov V.A. et al., Testing of auto hydraulic-fracturing growth of the linear oilfield development system of Priobskoye oil field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2012, no. 5, pp. 70–73.

2. Baykov V.A., Davletbaev A.Ya., Usmanov T.S., Stepanova Z.Yu., Special well tests to fractured water injection wells (In Russ.), Neftegazovoe delo, 2011, no. 1, pp. 65–75, URL: http://ogbus.ru/files/ogbus/authors/Baikov/Baikov_1.pdf

3. Davletbaev A.Ya., Baykov V.A., Ozkan E. et al., Multi-layer steady-state injection test with higher bottomhole pressure than the formation fracturing pressure (In Russ.), SPE 136199-RU, 2010, https://doi.org/10.2118/136199-RU.

4. Davletbaev A.Ya., Baykov V.A., Bikbulatova G.R. et al., Field studies of spontaneous growth of induced fractures in injection wells (In Russ.), SPE 171232-RU, 2014, https://doi.org/10.2118/171232-RU.

5. Makhota N.A., Davletbaev A.Ya., Fedorov A.I. et al., Examples of mini-frac test data interpretation in low-permeability reservoir (In Russ.), SPE 171175-RU, 2014, https://doi.org/10.2118/171175-RU.

6. Fedorov A.I., Davletova A.R., Kolonskikh A.V., Toropov K.V., Justification of the necessity to consider the effects of changes in the formation stress state in the low permeability reservoirs development (In Russ.), Nauchno-tekhnicheskiy vestnik OAO “NK “Rosneft'”, 2013, no. 2(31), pp. 25–29.

7. Fedorov A.I., Davletova A.R., Reservoir stress state simulator for determining of fracture growth direction (In Russ.), Geofizicheskie issledovaniya = Geophysical research, 2014, V. 15, no. 1, pp. 15–26.

8. Ivashchenko D.S., Sayfullin I.F., Fedorov A.I., Khabirov S.S., Simulation of auto fracturing cracks in zones of drilling lateral horizontal wellbore (In Russ.), Proceedings of International Scientific and Practical Conference “Gorizontal'nye skvazhiny i GRP v povyshenii effektivnosti razrabotki neftyanykh mestorozhdeniy” (Horizontal wells and hydraulic fracturing in improving the efficiency of oil field development), Kazan', 2017, pp. 184–186.

9. Davletova A.R., Fedorov A.I., Shchutskiy G.A., Self-induced hydraulic fracture growth in vertical plane (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2019, no. 6., pp. 50-53.


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