Rate transient analysis of fractured horizontal wells

UDK: 622.276.66.013
DOI: 10.24887/0028-2448-2020-10-62-67
Key words: well test analysis, decline analysis, well logging, horizontal well, hydraulic fracturing, low-permeability reservoir
Authors: R.R. Urazov (RN-BashNIPIneft LLC, RF, Ufa), A.Ya. Davletbaev (RN-BashNIPIneft LLC, RF, Ufa), A.I. Sinitskiy (RN-BashNIPIneft LLC, RF, Ufa), A.Kh. Nuriev (RN-BashNIPIneft LLC, RF, Ufa), K.V. Toropov (Rosneft Oil Company, RF, Moscow), A.V. Sergeychev (Rosneft Oil Company, RF, Moscow), M.O. Filev (Kondaneft Oil Company JSC, RF, Khanty-Mansiysk)

The paper presents a combined approach to testing hydraulically fractured horizontal wells, including Rate Transient Analysis (RTA), taking into account the results of well logging to determine the flow profile along a horizontal well. The proposed approach to the decline analysis in hydraulically fractured horizontal wells, in addition to evaluating unknown parameters (reservoir permeability, fracture conductivity, skin factor, etc.), allows to remove uncertainty in the parameters of well completion, namely, to calculate individual fracture half-lengths. To illustrate the essence of the method, the sequence of actions for a comprehensive approach to the decline analysis in hydraulically fractured horizontal wells is given.

The proposed approach was tested on field data. A comparison of the results obtained using both the existing and improved approach, based on the model of horizontal well with various fractures, was made. It is shown that the constructed model of the horizontal well with various fractures is characterized by greater reliability compared to the model of the horizontal well with the same fractures and can be used to predict the operation of the well. The combined approach to joint planning and interpretation of the RTA and well logging takes into account the uneven inflow along the hydraulically fractured horizontal well, which, in the future, will allow more correctly predicting additional production from various selective measures at separate stages and will increase the efficiency of geological and technical measures in the hydraulically fractured horizontal wells.

References

1. Asalkhuzina G.F., Davletbaev A.Ya., Il'yasov A.M. et al., Pressure drop analysis before and after fracture closure for test injections before main fracturing treatment (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 11, pp. 41–45.

2. Asalkhuzina G.F., Davletbaev A.Ya., Fedorov A.I. et al., Identification of second hydraulic fracture direction using decline-analysis and geomechanical simulation using RN-KIN software (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2018, no. 11, pp. 114–118.

3. Davletbaev A.Ya., Makhota N.A., Nuriev A.Kh. et al., Design and analysis of injection tests during hydraulic fracturing in low-permeability reservoirs using RN-GRID software package (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2018, no. 10, pp. 77–83.

4.  Ishkin D.Z., Nuriev R.I., Davletbaev A.YA. et al., Decline-analysis/“short” build-up welltest analysis of low permeability gas reservoir (In Russ.), SPE 181974-RU, 2016, http://dx.doi.org/10.2118/181974-RU

5.  Kotezhekov V., Margarit A., Pustovskikh A., Sitnikov A., Development of automatic system for decline analysis (In Russ.), SPE-187755-RU, 2017,  https://doi.org/10.2118/187755-RU

6. Morozovskiy N.A., Krichevskiy V.M. et al., Approaches to the quantitative interpretation of well testing during long-term monitoring of development in conditions of low information content of traditional technologies (In Russ.), Inzhenernaya praktika, 2015, no. 11, pp.  93-98.

7. Krichevskiy V.M., Morozovskiy N.A., Gulyaev D.N., Bikkulov M.M., Optimizing fractured horizontals performance with well test data (In Russ.), SPE-176566-RU, 2015, https://doi.org/10.2118/176566-RU.

8. Yarullin R.K., Valiullin A.S., Valiullin M.S. et al., The first experience of geophysical studies in long horizontal wells with using ESP bypass system (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 1, pp. 62–65.

9. 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.

10. Powell J.D.M., The BOBYQA algorithm for bound constrained optimization without derivatives, Technical Report, 2009, 39 p.

11. Van Everdingen A.F., Hurst W., The application of the Laplace transformation to flow problems in reservoirs, SPE-949305-G, 1949.

12. Ozkan E., Performance of horizontal wells, Oklahoma, Tulsa University, 1988.

The paper presents a combined approach to testing hydraulically fractured horizontal wells, including Rate Transient Analysis (RTA), taking into account the results of well logging to determine the flow profile along a horizontal well. The proposed approach to the decline analysis in hydraulically fractured horizontal wells, in addition to evaluating unknown parameters (reservoir permeability, fracture conductivity, skin factor, etc.), allows to remove uncertainty in the parameters of well completion, namely, to calculate individual fracture half-lengths. To illustrate the essence of the method, the sequence of actions for a comprehensive approach to the decline analysis in hydraulically fractured horizontal wells is given.

The proposed approach was tested on field data. A comparison of the results obtained using both the existing and improved approach, based on the model of horizontal well with various fractures, was made. It is shown that the constructed model of the horizontal well with various fractures is characterized by greater reliability compared to the model of the horizontal well with the same fractures and can be used to predict the operation of the well. The combined approach to joint planning and interpretation of the RTA and well logging takes into account the uneven inflow along the hydraulically fractured horizontal well, which, in the future, will allow more correctly predicting additional production from various selective measures at separate stages and will increase the efficiency of geological and technical measures in the hydraulically fractured horizontal wells.

References

1. Asalkhuzina G.F., Davletbaev A.Ya., Il'yasov A.M. et al., Pressure drop analysis before and after fracture closure for test injections before main fracturing treatment (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 11, pp. 41–45.

2. Asalkhuzina G.F., Davletbaev A.Ya., Fedorov A.I. et al., Identification of second hydraulic fracture direction using decline-analysis and geomechanical simulation using RN-KIN software (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2018, no. 11, pp. 114–118.

3. Davletbaev A.Ya., Makhota N.A., Nuriev A.Kh. et al., Design and analysis of injection tests during hydraulic fracturing in low-permeability reservoirs using RN-GRID software package (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2018, no. 10, pp. 77–83.

4.  Ishkin D.Z., Nuriev R.I., Davletbaev A.YA. et al., Decline-analysis/“short” build-up welltest analysis of low permeability gas reservoir (In Russ.), SPE 181974-RU, 2016, http://dx.doi.org/10.2118/181974-RU

5.  Kotezhekov V., Margarit A., Pustovskikh A., Sitnikov A., Development of automatic system for decline analysis (In Russ.), SPE-187755-RU, 2017,  https://doi.org/10.2118/187755-RU

6. Morozovskiy N.A., Krichevskiy V.M. et al., Approaches to the quantitative interpretation of well testing during long-term monitoring of development in conditions of low information content of traditional technologies (In Russ.), Inzhenernaya praktika, 2015, no. 11, pp.  93-98.

7. Krichevskiy V.M., Morozovskiy N.A., Gulyaev D.N., Bikkulov M.M., Optimizing fractured horizontals performance with well test data (In Russ.), SPE-176566-RU, 2015, https://doi.org/10.2118/176566-RU.

8. Yarullin R.K., Valiullin A.S., Valiullin M.S. et al., The first experience of geophysical studies in long horizontal wells with using ESP bypass system (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 1, pp. 62–65.

9. 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.

10. Powell J.D.M., The BOBYQA algorithm for bound constrained optimization without derivatives, Technical Report, 2009, 39 p.

11. Van Everdingen A.F., Hurst W., The application of the Laplace transformation to flow problems in reservoirs, SPE-949305-G, 1949.

12. Ozkan E., Performance of horizontal wells, Oklahoma, Tulsa University, 1988.


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