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Experimental and analytical studies of fracture permeability changes due to crack closure

Authors: Yu.A. Kashnikov, S.G. Ashikhmin, D.V. Shustov (Perm National Research Polytechnic University, RF, Perm), A.A. Antonenko, N.B. Krasilnikova (RN- KrasnoyarskNIPIneft LLC, RF, Krasnoyarsk)

Key words: crack, permeability, effective stress.

The results of experimental and analytical studies of changes of fracture permeability samples Yurubcheno-Tokhomskoye gas field under the influence of effective stress are presented. The purpose was to study the changes of fracture permeability due to increasing and decreasing effective stress, in other words due to depletion and waterflood treatments. Processing of the results of the experiment carried out on the basis of geomechanical model crack Barton-Bandisa. In result the laws of variation of fracture permeability in loading and unloading of samples and reduce the estimate of filtration properties of the rock mass. It is shown that the use of the law to reduce the resulting permeability and recovery is possible with the information on the distribution of cracks in the array and their disclosure. This information can be obtained by using modern methods of geophysics and geomechanics.

References

1. Kutukova N.M., Birun E.M., Malakhov R.A. et al., Neftyanoe khozyaystvo – Oil Industry, 2012, no. 11, pp. 4-7.

2. Kashnikov Yu.A., Gladyshev S.V., Razyapov R.K. et al., Neftyanoe khozyaystvo – Oil Industry, 2011, no. 4, pp. 104-107.

3. Kashnikov Yu.A., Ashikhmin S.G., Mekhanika gornykh porod pri razrabotke mestorozhdeniy uglevodorodnogo syr'ya (Rock mechanics in the development of hydrocarbon deposits), Moscow: OOO “Nedra-Biznestsentr” Publ., 2007, 486 p.

4. Barton N.R., Bandis S.N., Bakhtar K., Strength, deformation and conductivity coupling of rock joints, Int. J. Rock Mech., 1985, no. 36, pp. 121-140.

Key words: crack, permeability, effective stress.

The results of experimental and analytical studies of changes of fracture permeability samples Yurubcheno-Tokhomskoye gas field under the influence of effective stress are presented. The purpose was to study the changes of fracture permeability due to increasing and decreasing effective stress, in other words due to depletion and waterflood treatments. Processing of the results of the experiment carried out on the basis of geomechanical model crack Barton-Bandisa. In result the laws of variation of fracture permeability in loading and unloading of samples and reduce the estimate of filtration properties of the rock mass. It is shown that the use of the law to reduce the resulting permeability and recovery is possible with the information on the distribution of cracks in the array and their disclosure. This information can be obtained by using modern methods of geophysics and geomechanics.

References

1. Kutukova N.M., Birun E.M., Malakhov R.A. et al., Neftyanoe khozyaystvo – Oil Industry, 2012, no. 11, pp. 4-7.

2. Kashnikov Yu.A., Gladyshev S.V., Razyapov R.K. et al., Neftyanoe khozyaystvo – Oil Industry, 2011, no. 4, pp. 104-107.

3. Kashnikov Yu.A., Ashikhmin S.G., Mekhanika gornykh porod pri razrabotke mestorozhdeniy uglevodorodnogo syr'ya (Rock mechanics in the development of hydrocarbon deposits), Moscow: OOO “Nedra-Biznestsentr” Publ., 2007, 486 p.

4. Barton N.R., Bandis S.N., Bakhtar K., Strength, deformation and conductivity coupling of rock joints, Int. J. Rock Mech., 1985, no. 36, pp. 121-140.


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