Hydraulic fracturing using high-boiling fraction of oil as a fracturing fluid

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Abstract

Background: In recent years, there has been a trend towards deterioration in the structure of residual reserves at the fields of Kazakhstan. A significant part of the reserves is located in low-permeability reservoirs and in the zones not covered by flooding. The main factor negatively affecting the productivity and efficiency of development is the heterogeneity of oil reservoirs.

Oil-saturated formations are an alternation of permeable oil-saturated sand or limestone and impermeable clay or dolomite layers, lenses and interlayers. Up to 10–20 interlayers can be distinguished within the reservoir, which indicates a strong compartmentalization of the reservoirs. Due to the complexity of the structure of oil deposits, it is very difficult or impossible to ensure complete drainage of the entire volume of the deposit and complete coverage of oil displacement by water into production wells through injection wells.

Aim: Increasing oil recovery in a cost-effective way.

Materials and methods: Experimental studies of the processes of impact on the bottomhole formation zone with high-boiling oil components were carried out using a laboratory machine for diamond drilling, an installation for determining the permeability of a rock in terms of liquid and gas, an installation for determining oil viscosity, and an installation for pumping fracturing fluid into the reservoir model.

Results: As a result of applying the hydraulic fracturing method using high-boiling oil components, it is possible to increase the permeability of low-permeability formations and significantly increase oil recovery.

Conclusion: Due to the geological structure of multi-layer oilfields, water-based gel fracturing fluids to increase oil flow to wells are considered ineffective due to the adsorption of gels with long molecules in the pores of the formation and swelling of the clay particles of the reservoir when they interact with the water-based fluid.

About the authors

Moldir A. Mashrapova

Institute of geological sciences of K.I. Satpayev

Author for correspondence.
Email: moldir_m_m@mail.ru
ORCID iD: 0000-0002-6009-9730
Scopus Author ID: 56721302700
ResearcherId: AAD-4825-2020

PhD

Kazakhstan, Almaty

Nurbol Tileuberdi

Institute of geological sciences of K.I. Satpayev

Email: nureke-17@mail.ru
ORCID iD: 0000-0003-0781-2434
Scopus Author ID: 57195378526

PhD

Kazakhstan, Almaty

Dairabay Zhumadiluly Abdeli

Satbayev University

Email: d.abdeli@mail.ru
Scopus Author ID: 57200382346

D. Sc. (Engineering)

Kazakhstan, Almaty

Sultan M. Ozdoyev

Institute of geological sciences of K.I. Satpayev

Email: ozdoyevsultan@mail.ru
ORCID iD: 0000-0003-0262-1583
Scopus Author ID: 57195382978

D. Sc. (Geology and Mineralogy)

Kazakhstan, Almaty

Ardak S. Iskak

Satbayev University

Email: a.yskak@satbayev.university
Scopus Author ID: 56826148100

PhD

Kazakhstan, Almaty

References

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Supplementary files

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2. Figure 1. Action of water-based gel fluid in the reservoir

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3. Figure 2. Fracture flow capacity and stress cross section during explosion with the use of a water-based liquid in zone BP-11-1

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4. Figure 3. Fracture flow capacity and stress cross section during explosion with the use of an oil-based liquid in zone BP-11-1

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5. Figure 4. Production rate and wetting of oil and water before and after the explosion with the use of a water-based liquid in zone BP-11-1

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6. Figure 5. Production rate and wetting of oil and water before and after the explosion with the use of an oil-based liquid in zone BP-11-1

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7. Figure 6. The scheme of hydraulic fracturing technology using components with a high boiling point of oil and acid mixtures with a content of atoms ≥ C8 in a carbon molecule

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8. Figure 7. Technological scheme for the separation of high-temperature oil components with a content of atoms ≥С8 in a carbon molecule

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9. Figure 8. Scheme of installation for core blasting with thick oil in laboratory conditions

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10. Figure 9. Waste oil volumes during hydraulic fracturing

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Copyright (c) 2023 Mashrapova M.A., Tileuberdi N., Abdeli D.Z., Ozdoyev S.M., Iskak A.S.

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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