Логин:
Пароль:
Регистрация
Забыли свой пароль?

Design and analysis of injection tests during hydraulic fracturing in low-permeability reservoirs using RN-GRID software package

UDK: 622.276.66
DOI: 10.24887/0028-2448-2018-10-77-83
Key words: well test analysis, low-permeability reservoir, injection test, hydraulic fracturing, diagnostic fracture injection test (DFIT), pressure fall-of curve, after closure analysis, log-log analysis
Authors: A.Ya. Davletbaev (RN-UfaNIPIneft LLC, RF, Ufa), N.A. Makhota (RN-UfaNIPIneft LLC, RF, Ufa), A.Kh. Nuriev (RN-UfaNIPIneft LLC, RF, Ufa), R.R. Urazov (RN-UfaNIPIneft LLC, RF, Ufa), A.V. Pestrikov (Rosneft Oil Company, RF, Moscow), A.V. Sergeychev (Rosneft Oil Company, RF, Moscow)

The paper describes the procedures for planning, implementation, interpretation of diagnostic fracture injection test (DFIT), analysis of calibration tests (substitution, mini-frac) in hydraulic fracturing. The main stages of the procedures, recommendations, as well as the results are given. The advantages of injection tests over traditional methods of wells hydrodynamic studies in respect of low-permeability reservoirs are considered. Particular attention is paid to description of injection test results interpretation algorithm. Theoretical foundations of methods for injection tests analysis (i.e., before closure analysis, after closure analysis (Nolte method) and log-log analysis) are discussed. The main problem is the lack of reliable information about the geometry of the crack, its height and the pay zone of the fractured formation. These parameters are important for reliable assessment of reservoir permeability.

В The article describes in detail the injection tests results interpretation technology. It is shown that the basis of a reliable interpretation is the simulation of hydraulic fracture created while performing the injection test. In the concluding section, we present approbation results of discharge tests interpretation technology performed for the wells of the Rosneft Oil Company. Good agreement between the values of permeability and reservoir pressure obtained by different methods indicates the equivalence of the analysis methods used. In addition, comparison of the results of the analysis with the data obtained from the Decline Analysis confirms their reliability and correctness of the approach adopted.

References

1. Nolte K.G., Determination of fracture parameters from fracturing pressure decline analysis, SPE 8341, 1979.

2. Nolte K.G., A general analysis of fracturing pressure decline analysis with application to three models, SPE 12941-PA, 1986.

3. Castillo J.L., Modified fracture pressure decline analysis including pressure-dependent leakoff, SPE 16417, 1987.

4. Nolte K.G., Background for after-closure analysis of fracture calibration tests, SPE 39407, 1997.

5. Soliman M.Y., Analysis of buildup tests with short producing time, SPE11083-PA, 1986.

6. Soliman M.Y. et al., New method for determination of formation permeability, reservoir pressure, and fracture properties from a minifrac test, 05-658 ARMA Conference Paper, 2005.

7. Craig D.P., Blasingame T.A., Application of a new fracture-injection falloff model accounting for propagating, dilated, and closing hydraulic fractures, SPE 1005778, 2006.

8. Barree R.D., Barree V.L., Craig D.P., Holistic fracture diagnostics: Consistent interpretation of prefrac injection tests using multiple analysis methods, SPE 107877, 2007.

9. Soliman M.Y., Pongratz R., Rylance M., Prather D., Fracture treatment optimization for horizontal well completion, SPE 102616, 2006.

10. 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, 2014.

11. URL: https://www. tricanwellservice.com/sites/default/files/pdf/ 806_MiniFracAnalysis-Poster.pdf

12. Economides M.J., Nolte K.G., Reservoir stimulation, USA, New York: J.Wiley and Sons, 2000, 862 p.

13. Blasingame T.A., Johnston J.L., Lee W.J., Type curve analysis using the pressure integral method, SPE 18799, 1989.В В 

The paper describes the procedures for planning, implementation, interpretation of diagnostic fracture injection test (DFIT), analysis of calibration tests (substitution, mini-frac) in hydraulic fracturing. The main stages of the procedures, recommendations, as well as the results are given. The advantages of injection tests over traditional methods of wells hydrodynamic studies in respect of low-permeability reservoirs are considered. Particular attention is paid to description of injection test results interpretation algorithm. Theoretical foundations of methods for injection tests analysis (i.e., before closure analysis, after closure analysis (Nolte method) and log-log analysis) are discussed. The main problem is the lack of reliable information about the geometry of the crack, its height and the pay zone of the fractured formation. These parameters are important for reliable assessment of reservoir permeability.

В The article describes in detail the injection tests results interpretation technology. It is shown that the basis of a reliable interpretation is the simulation of hydraulic fracture created while performing the injection test. In the concluding section, we present approbation results of discharge tests interpretation technology performed for the wells of the Rosneft Oil Company. Good agreement between the values of permeability and reservoir pressure obtained by different methods indicates the equivalence of the analysis methods used. In addition, comparison of the results of the analysis with the data obtained from the Decline Analysis confirms their reliability and correctness of the approach adopted.

References

1. Nolte K.G., Determination of fracture parameters from fracturing pressure decline analysis, SPE 8341, 1979.

2. Nolte K.G., A general analysis of fracturing pressure decline analysis with application to three models, SPE 12941-PA, 1986.

3. Castillo J.L., Modified fracture pressure decline analysis including pressure-dependent leakoff, SPE 16417, 1987.

4. Nolte K.G., Background for after-closure analysis of fracture calibration tests, SPE 39407, 1997.

5. Soliman M.Y., Analysis of buildup tests with short producing time, SPE11083-PA, 1986.

6. Soliman M.Y. et al., New method for determination of formation permeability, reservoir pressure, and fracture properties from a minifrac test, 05-658 ARMA Conference Paper, 2005.

7. Craig D.P., Blasingame T.A., Application of a new fracture-injection falloff model accounting for propagating, dilated, and closing hydraulic fractures, SPE 1005778, 2006.

8. Barree R.D., Barree V.L., Craig D.P., Holistic fracture diagnostics: Consistent interpretation of prefrac injection tests using multiple analysis methods, SPE 107877, 2007.

9. Soliman M.Y., Pongratz R., Rylance M., Prather D., Fracture treatment optimization for horizontal well completion, SPE 102616, 2006.

10. 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, 2014.

11. URL: https://www. tricanwellservice.com/sites/default/files/pdf/ 806_MiniFracAnalysis-Poster.pdf

12. Economides M.J., Nolte K.G., Reservoir stimulation, USA, New York: J.Wiley and Sons, 2000, 862 p.

13. Blasingame T.A., Johnston J.L., Lee W.J., Type curve analysis using the pressure integral method, SPE 18799, 1989.В В 



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

13.11.2019
08.11.2019
30.10.2019