Innovative solutions in construction of deep industrial brine, oil and gas wells in deformable fractured reservoirs

The paper deals with the methodological features of drilling and completion of wells in the fractured natural reservoirs containing oil and gas accumulations with different reservoir pressures of fluid-pressure systems from abnormally high to abnormally low. The authors had studied the fluid-pressure systems of industrial lithium-bromine brines, oil and gas fields and accumulations in the south of the Siberian platform for the period from 1983 to 2019. The article summarizes the main results, including new technical solutions protected by the Russian Federation patents. The authors proposed and patented a series of new technical solutions for the immediate consolidation of natural permeable fractures during the primary opening of the reservoir by drilling, as applied to a fractured reservoir. The main task of the study is to preserve the permeability of the fractured system in the bottomhole formation zone under the action of compressive stresses (rock mass) that increase with the formation of a drawdown cone, primarily in the bottomhole formation zone with the increase in the drawdown (ΔP) above critical values. Such an area is the bottomhole formation zone within a radius of the first meters around the well that penetrated the fractured reservoir. Practice has proved that the use of innovative solutions through the advanced consolidation of permeable fractures in the bottomhole formation zone (of fluid-producing oil- and gas-bearing, water-bearing reservoir) in the open (initial natural) state ensures the preservation of natural permeability of natural filtering fractures of the reservoir with the fluid system reservoir pressure from anomalously low to abnormally high. The solution ensures constant permeability of the fractured filtration system throughout the cleaning cycles of the bottomhole formation zone rocks from drilling mud, obtaining of the true calculated hydrodynamic parameters based on the results of well testing in the modes of the “steady-state production method” and well flow rate (productivity) stabilization under further well operation.

1. Belonin MD, Slavin VI, Chilingar DV. Abnormally high reservoir pressures. Origin, forecast, development problems of hydrocarbon deposits. Saint Petersburg: Nedra; 2005. 324 p. (In Russ.)

2. Borevskii LV. Analysis of the effect of reservoir physical deformations on the assessment of operational groundwater reserves in deep aquifers. In: Bondarenko SS, Vartanyan GS (eds.). Metody izucheniya i otsenka resursov glubokikh podzemnykh vod = Research methods and assessment of deep groundwater resources. Moscow: Nedra; 1986. p.374–395. (In Russ.)

3. Vakhromeev AG, Ivanishin VM, Sverkunov SA, Polyakov VN, Razyapov RK. Deep well as a facility for on-line hydraulic studies of the stress state of the rock mass in fluid-saturated fractured reservoirs. Geodinamika i tektonofizika = Geodynamics & Tectonophysics. 2019;10(3):761–778. (In Russ.) https://doi.org/10.5800/GT-2019-10-3-0440

4. Vakhromeev AG, Sverkunov SA, Ivanishin VM, Il'in AI. Drilling of oil and gas wells in complex mining and geological conditions: fractured natural reservoirs, abnormally low and abnormally high pressure of reservoir fluid systems. Irkutsk: Irkutsk National Research Technical University; 2019. 420 p. (In Russ.)

5. Kashnikov YuA, Gladyshev SV, Ryazapov RK, Kontorovich AA, Krasilnikova NB. Hydrodynamical modeling of first-priority area in development of YurubchenoTokhomskoye oilfield, with a glance of geomechanical effect of closing the fracture. Neftyanoe khozyaistvo. 2011;4:104–107. (In Russ.)

6. Fuks BA, Vashchenko VA, Moskal'ts AG. Production characteristics of productive reservoirs in the south of the Siberian platform. Moscow: Nedra; 1982. 184 p. (In Russ.)

7. Aurton S. High fluid pressure, isothermal surfaces and initiation nappe movement. Geology. 1980;8(4)172–174. https://doi.org/10.1130/0091-7613(1980)82.0.CO;2

8. Barton NR, Bandis S, Bakhtar K. Strength, deformation and conductivity coupling of rock joints. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. 1985;22(3):121–140. https://doi.org/10.1016/0148-9062(85)93227-9

9. Blanton TL. Propagation of hydraulically and dynamically induced fractures in naturally fractured reservoirs. SPE 15261, Presented at the SPE/DOE Unconventional Gas Technology Symposium. Louisville; 1986.

10. Butts Ch. Fensters in the Cumberland overthrust block in Southwestern Virqinia. Virginia Geological Survey Bulletin. 1927;28:1–12.

11. Chilingar GV, Serebryakov VA, Robertson JO. Origin and prediction of abnormal formation pressures. Oxford: Elsevier; 2002. 391 p.

12. De Paor DG. Balanced section in thrust belts. Part 1: Construction. The American Association of Petroleum Geologists Bulletin. 1988;72(1):73–90. https://doi.org/10.1306/703C81CD-1707-11D7-8645000102C1865D

13. Fertl WH, Chapman RE, Hotz RF. Studies in abnormal pressures. In: Developments in Petroleum Science. Vol. 38. Oxford: Elsevier; 1994. 452 p.

14. Hoek E, Carranza-Torres C, Corkum B. HoekBrown failure criterion. In: Proceedings of the 5th North American Rock Mechanics Symposium. Toronto; 2002. p.267–273.

15. Hubbert MK, Rubey WW. Role of fluid pressure in mechanics of overthrust faulting: I. Mechanics of fluid-filled porous solids and its application to overthrust faulting. Geological Society of America Bulletin. 1959;70(2):115–166. https://doi.org/10.1130/0016-7606(1959)70[115:ROFPIM]2.0.CO;2

16. Jennings AR. Hydraulic fracturing applications. PE Enhanced Well Stimulation, Inc.; 2003. 168 p.

17. Vakhromeev AG, Sverkunov SA, Ivanishin VM, Siraev RU, Razjapov RK, Sotnikov AK, et al. Method for primary opening by drilling of horizontal shaft in fracture type of oil and gas saturated carbonate reservoir under conditions of abnormally low formation pressures. Patent RF, no. 2602437; 2016. (In Russ.)

18. Ivanishin VM, Vakhromeev AG, Sverkunov SA, Siraev RU, Gorlov IV, Lankin YK. Method of testing and conversion of fluid-saturated fracture reservoir bed (variants). Patent RF, no. 2657052; 2018. (In Russ.)

19. Ruzhich VV, Vakhromeev AG, Sverkunov SA, Shilko EV, Ivanishin VM, Akchurin RKh. Method for reduction of excessive elastic energy in deep seismic dangerous segments of fractures. Patent RF, no. 2740630; 2021. (In Russ.)

20. Akchurin RKh, Burmistrov IA, Vakhromeev AG, Danilova EM, Ivanishin VM, Lebedev LS, et al. Technology and geological commercial support of horizontal cluster drilling of oil producing wells in the complex carbonate reservoirs of the Riphean Yurubcheno-Tokhomskoye oil and gas condensate field. Irkutsk: Irkutsk National Research Technical University; 2016. 224 p. (In Russ.)