Implementation of horizontal wells with multistage hydraulic fracturing for low-permeability oil reservoir development

UDK: 622.276.66
DOI: 10.24887/0028-2448-2022-9-90-95
Key words: oil field, low-permeability reservoir, horizontal wells, multistage hydraulic fracturing, development system
Authors: S.V. Arefiev (LUKOIL-Western Siberia LLC, RF, Kogalym), I.S. Sokolov (KogalymNIPIneft Branch of LUKOIL-Engineering LLC in Tyumen, RF, Tyumen), M.S. Pavlov (KogalymNIPIneft Branch of LUKOIL-Engineering LLC in Tyumen, RF, Tyumen), O.N. Bosykh (KogalymNIPIneft Branch of LUKOIL-Engineering LLC in Tyumen, RF, Tyumen), E.D. Gorodilova (KogalymNIPIneft Branch of LUKOIL-Engineering LLC in Tyumen, RF, Tyumen)

The article highlights the experience of developing one of the objects of the Vasyuganskaya formation represented by a low-permeability reservoir (less than 2·10-3 μm2). At the initial stage of development, the formation was characterized as complex, poorly studied and had a low production potential, which affected the economics of the proposed well placement systems. Despite this, the subsoil user implemented drilling in a mature development system, which allowed analyzing the actual results of the well operation, identifying the specifics of development and determining the types of research for design purposes. At the next stage, there were considered options with the use of horizontal wells with multistage hydraulic fracturing. Together with the use of new issues of state legislation, it provided an economically and technologically effective development option. Most of the object has been drilled and put into operation. The article presents the characteristics of oil displacement in the coordinates ‘recovery from initial recoverable reserves – water cut’, the logarithmic dependence of the starting oil rate on the horizontal section lengths, the exponential function of the oil rate dynamics on the horizontal section lengths. The authors discuss the results of the performed studies (experiments): the impact of shutdown of injection wells on the operation of production wells, determination of the radius of drainage of production and injection wells, determination of the interval of hydraulic fracturing impact on the rock and the azimuth of fracture strike using the full waveform acoustic logging method. A promising trend for ensuring the efficient recovery of oil reserves is the use of horizontal injection wells, longer horizontal wells with a simultaneous increase in the number of hydraulic fracturing stages, repeated hydraulic fracturing in the horizontal section of wells.



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