In the territory of the Kuyumbinskoye field in Eastern Siberia the well stimulation is an important task due to the specifics of geological structure. Vuggy-fractured dolomite reservoir, block structure of reservoir, impermeable matrix, low porosity and permeability, characteristics of cracks development, formation temperature and other features impose many restrictions on the use of implemented technologies, in particular on hydraulic fracturing. Due to the non-distribution of carbonate vuggy-fractured reservoirs on the territory of Russia, hydraulic fracturing was not previously used on objects with similar conditions. In this connection, the application of this technology required not only theoretical, but also practical research. Pilot tests and research on various types of hydraulic fracturing using two interval isolation technologies were carried out at the Kuyumbinskoye field in 2017 and 2022. On the positive side, proppant hydraulic fracturing with the use of straddle packer assemblies and MSHF assembly has proven itself. Acid and acid-proppant fracturing, as well as proppant fracturing performed without isolation of injection intervals, proved to be ineffective. At one of the wells, microseismic monitoring studies were carried out during the work, which made it possible to carry out a detailed assessment of seismic events that occurred during hydraulic fracturing in the reservoir. Through the use of this technology, the fact of the development of two fracture systems was discovered, which explains the complication obtained during hydraulic fracturing. Microseismic hydraulic fracture mapping also allowed to confirm the correctness of the crack geometry constructed at the design stage. The features of the work performed will allow, when planning future programs for hydraulic fracturing, to minimize the possibility of failures, as well as to apply the technology in similar geological conditions with less uncertainty.
References
1. Kulakov D.P., Khadimullin R.R., Specifics of geological and engineering operations in carbonate reservoirs with non-permeable matrix (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2023, no. 7, pp. 31–35, DOI: https://doi.org/10.24887/0028-2448-2023-7-31-35
2. Melikbekov A.S., Teoriya i praktika gidravlicheskogo razryva plasta (Theory and practice of hydraulic fracturing), Moscow: Nedra Publ., 1986, 141 p.
3. Ivanov S.I., Intensifikatsiya pritoka nefti i gaza k skvazhinam (Intensification of oil and gas flow to wells), Moscow: Nedra-Biznestsentr Publ., 2006, 565 p.
4. Jennings A.R., OGCI/PetroSkills hydraulic fracturing applications, PE Enhanced Well Stimulation, Inc., 2010, 340 p.
5. Grishchenko V.A., Bashirov I.R., Mukhametshin M.R., Bil’danov V.F., Features of application of proppant-acid fracturing technology o in the fields of the Republic of Bashkortostan (In Russ.), Neftyanoe khozyaystvo, 2018, no. 12, pp. 120–122, DOI: https://doi.org/10.24887/0028-2448-2018-12-120-122
6. Akopyan E.A., Stepanets L.Yu., Analysis of technologies for multi-stage hydraulic fracturing in horizontal wells (In Russ.), Innovatsionnaya nauka, 2018, no. 7–8, pp. 17–19.
7. Ponomarev A.A., Nesterenko M.Yu., Microseismic monitoring and hydraulic fracturing process during the exploitation of hydrocarbon fields (In Russ.), Vestnik sovremennykh issledovaniy, 2018, no. 12.1(27), pp. 650–651.
