Published January 2022, Pg. 24-27

Section: Technique and technology of oil-gas production

UOT: 622.276.4; 622.276.6

DOI: 10.37474/0365-8554/2022-1-24-27

Intensification of development of high-viscous oil of inhomogeneous reservoirs

K.T. Bisembayeva Cand. in Tech. Sc. - Caspian State University of Technologies and Engineering named after Sh. Yesenov

A.S. Hadiyeva - Caspian State University of Technologies and Engineering named after Sh. Yesenov

E.N. Mamalov Cand. in Tech. Sc. - Institute for Oil and Gas

G.S. Sabyrbayeva Cand. in Tech. Sc. - Caspian State University of Technologies and Engineering named after Sh. Yesenov

The great majority of oil fields are multi-layer, the productive formations of which are layered-inhomogeneous. The development of layer-inhomogeneous reservoirs with flooding contributes to the progress of injected water by the high-permeable formation. Therefore, premature flooding of developing wells and oil recovery decrease occurs. With increasing of oil viscosity, the negative effect of reservoir inhomogeneity is reflected on the efficiency of flooding while development of layered-inhomogeneous formations more significantly. Thus, with the purpose of intensification of oil development from such fields, various methods of impact are suggested, one of which is polymer flooding.

The application of polymer solution for increasing oil recovery in layered-inhomogeneous reservoir with hydrostatic isolated layers of various permeability is offered. Polyacrylamide was used as a polymer. While applying all characteristics and rheological properties of polyacrylamide are considered.

The process of oil replacement from layered-inhomogeneous reservoir was carried out in the following order: at first, it was necessary to study the depleted reservoir. With this aim, the oil replacement from layered-inhomogeneous reservoir is conducted with usual flooding. After the stabilization of oil recovery rate in the layer-inhomogeneous, the injection of polyacrylamide bank into the high permeable reservoir is started. The replacement of polyacrylamide bank was conducted via distilled water. Simultaneously, the oil replacement from low permeable reservoir was carried out with the injection of distilled water as well. To maintain the cleanness of experiment, distilled water was used as it affects the properties of polyacrylamide solution insignificantly. The experiments have been conducted on the tube reservoir model. As a porous medium, quartz sand of specific fraction was used.

References:

1. Office of Technology Assessment. Enhanced Oil Recovery Potential in the United States, 1978. Library of Congress Catalog Card Number 77-600063.

2. Thomas A. Polymer flooding. In: Chemical Enhanced Oil recovery (cEOR) – a Practical Overview (ed. L.Romero-Zeron). 2016. Inech https://doi.org/10.5772/64623.

3. Wang D., Han P., Shao Z., Weihong H., Seright R.S. Sweep improvement options for the Daqing oil field. SPE Reservoir Eval. Eng., 2008, v. 11, iss. 01, February, pp. 18-26.

4. Delamaide E., Bazin B., Rousseau D., Degre G. Chemical EOR for Heavy Oil the Canadian Experience, SPE 169715 presented at the SPE EOR Conference at Oil and Gas West Asia held in Muscat, Oman, 31 march-2 April, 2014.

5. Metody izvlecheniya ostatochnoy nefti / Surguchev M.L., Gorbunov A.T., Zabrodin D.P. i dr. – M.: Nedra, 1991, 347 s.

6. Chang H.L., 1978. Polymer flooding technology: yesterday, today and tomorrow. Paper SPE7043 presented at the Fifth Symposium on Improved Methods for Oil recovery, Tulsa, OK, 16-19 April. https://doi.org/10.2118/7043-PA.

7. Mamalov E.N., Gorshkova E.V. Odna iz vozhmozhnostey uvelicheniya nefteotdachi sloisto-neodnorodnogo plasta //
Azerbaidzhanskoe neftyanoe khozaistvo, 2020, No 3, s. 20-26.