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Seismic observations following dynamic formation stimulation through well No. 14414 on Tashliyarskaya area of Romashkinskoye field

UDK: 550.832.4
DOI: 10.24887/0028-2448-2019-7-11-15
Key words: stimulation, wave, earthquake, hairline fracture, formation, rock, seismic station, seismic gather, well, spectrum, frequency
Authors: R.N. Gatiyatullin (Tatar Geology and Prospecting Administration of Tatneft PJSC, RF, Kazan), V.M. Khusainov (TatNIPIneft, RF, Bugulma), B.G. Ganiev (Tatneft PJSC, RF, Almetyevsk), M.Kh. Rakhmatullin (Tatar Geology and Prospecting Administration of Tatneft PJSC, RF, Kazan), M.Sh. Khamitov (Tatar Geology and Prospecting Administration of Tatneft PJSC, RF, Kazan), A.V. Khusainov (Arm-Service OOO, RF, Aznakaevo), V.F. Simonenko (Russian Federal Nuclear Center – Zababakhin Russian Research Institute of Technical Physics, RF, Snezhinsk)

The method of dynamic formation stimulation using powder generator of pressure was tested on the Tashliyarskaya area of Romashkinskoye field. Well No. 14414 was selected for the field test. All in all, six consecutive treatments at three-hours interval were made using sets comprising 3, 5, 7, 8, 8, 7 charges. To understand the in-situ process, short-period wave field was continuously monitored using a network of high-sensitivity three-component digital seismic stations. Good-quality seismic signals were recorded and mechanisms of seismic signals generation were determined. Generation of seismic signals is conditioned by shots in well and by response of the formation in the near-wellbore zone and adjacent rocks. Waves’ travel paths to observation stations were explained. The obtained data help to understand seismic events that take place after treatment operations have been completed, and to assess the duration of the desired effect. Sources of seismic signals in the productive interval against the casing-formation annulus and in the adjacent rocks were determined, as well as channels of seismic signals propagation. The paper presents the results of seismic observations following the dynamic formation stimulation and the analysis of post-processes. Seismic gathers of local earthquakes were studied, time of direct waves’ arrivals and seismic spectra were determined, changes in microseismic background level were analyzed. The results confirm the effectiveness of the technology of dynamic stimulation using in-hole shots to increase the reservoir permeability. To improve the technology, the project should be extended to other field areas. This will allow to optimize stimulation modes considering changes in the subsurface environment and to work out proper measurement methods to determine the criteria for stimulation termination in real-time mode.

References

1. Khisamov R.S., Gatiyatullin N.S., Kuz'min Yu.O. et al., Sovremennaya geodinamika i seysmichnost' yugo-vostoka Tatarstana (Modern geodynamics and seismicity of the south-eastern part of Tatarstan), Kazan': FEN Publ., 2012, 240 p.

2. Kaazik P.B., Kopnichev Yu.F., Nersesov I.L., Rakhmatullin M.Kh., Analysis of the fine structure of short-period seismic fields for a group of stations (In Russ.), Doklady AN SSSR, 1989, V. 308, no. 5, pp. 1090–1094.

3. Kaazik P.B., Kopnichev Yu.F., Nersesov I.L., Rakhmatullin M.Kh., Analysis of the fine structure of short-period seismic fields for a group of stations (In Russ.), Izvestiya AN SSSR. Seria Fizika Zemli, 1990, no. 4, pp. 38–49.

4. Bath M., Spectral analysis in geophysics, Elsevier, Amsterdam, 1974, 563 p.

5. Nersesov I.L., Kaazik P.B., Rakhmatullin M.Kh., Tregub F.S., About the possibility of searching for gas fields by spectral ratios of the amplitudes of the microseismic background (In Russ.), Doklady AN SSSR, 1990, V. 312, no. 5, pp. 1084–1086.

The method of dynamic formation stimulation using powder generator of pressure was tested on the Tashliyarskaya area of Romashkinskoye field. Well No. 14414 was selected for the field test. All in all, six consecutive treatments at three-hours interval were made using sets comprising 3, 5, 7, 8, 8, 7 charges. To understand the in-situ process, short-period wave field was continuously monitored using a network of high-sensitivity three-component digital seismic stations. Good-quality seismic signals were recorded and mechanisms of seismic signals generation were determined. Generation of seismic signals is conditioned by shots in well and by response of the formation in the near-wellbore zone and adjacent rocks. Waves’ travel paths to observation stations were explained. The obtained data help to understand seismic events that take place after treatment operations have been completed, and to assess the duration of the desired effect. Sources of seismic signals in the productive interval against the casing-formation annulus and in the adjacent rocks were determined, as well as channels of seismic signals propagation. The paper presents the results of seismic observations following the dynamic formation stimulation and the analysis of post-processes. Seismic gathers of local earthquakes were studied, time of direct waves’ arrivals and seismic spectra were determined, changes in microseismic background level were analyzed. The results confirm the effectiveness of the technology of dynamic stimulation using in-hole shots to increase the reservoir permeability. To improve the technology, the project should be extended to other field areas. This will allow to optimize stimulation modes considering changes in the subsurface environment and to work out proper measurement methods to determine the criteria for stimulation termination in real-time mode.

References

1. Khisamov R.S., Gatiyatullin N.S., Kuz'min Yu.O. et al., Sovremennaya geodinamika i seysmichnost' yugo-vostoka Tatarstana (Modern geodynamics and seismicity of the south-eastern part of Tatarstan), Kazan': FEN Publ., 2012, 240 p.

2. Kaazik P.B., Kopnichev Yu.F., Nersesov I.L., Rakhmatullin M.Kh., Analysis of the fine structure of short-period seismic fields for a group of stations (In Russ.), Doklady AN SSSR, 1989, V. 308, no. 5, pp. 1090–1094.

3. Kaazik P.B., Kopnichev Yu.F., Nersesov I.L., Rakhmatullin M.Kh., Analysis of the fine structure of short-period seismic fields for a group of stations (In Russ.), Izvestiya AN SSSR. Seria Fizika Zemli, 1990, no. 4, pp. 38–49.

4. Bath M., Spectral analysis in geophysics, Elsevier, Amsterdam, 1974, 563 p.

5. Nersesov I.L., Kaazik P.B., Rakhmatullin M.Kh., Tregub F.S., About the possibility of searching for gas fields by spectral ratios of the amplitudes of the microseismic background (In Russ.), Doklady AN SSSR, 1990, V. 312, no. 5, pp. 1084–1086.



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