Multistage hydraulic fracturing at Vietsovpetro fields: experience and potential of implementation

UDK: 622.276.66 СМ

DOI: 10.24887/0028-2448-2025-11-88-92

Key words: multistage hydraulic fracturing (MSHF), hydraulic fracturing, offshore fields, Upper Oligocene, recovery factor, hard-to-recover reserves, frac-ports, soluble balls, MSHF assembly

Authors: T.E. Bazhikov (Research and Engineering Institute, Vietsovpetro JV, the Socialist Republic of Vietnam, Vung Tau); A.S. Klevtsov (Vietsovpetro JV, the Socialist Republic of Vietnam, Vung Tau); E.N. Grishchenko (Research and Engineering Institute, Vietsovpetro JV, the Socialist Republic of Vietnam, Vung Tau); D.I. Varlamov (Research and Engineering Institute, Vietsovpetro JV, the Socialist Republic of Vietnam, Vung Tau); A.F. Karimov (Zarubezhneft JSC, RF, Moscow)

The article presents the experience of implementing multi-stage hydraulic fracturing (MSHF) at the offshore fields of Vietsovpetro JV. The necessity of implementing the technology in Upper Oligocene terrigenous reservoirs, characterized by high compartmentalization, low permeability and significant lithological heterogeneity, which significantly limits the effectiveness of traditional production intensification methods, is substantiated. It was proved that traditional hydraulic fracturing in one stage does not provide sufficient coverage of productive intervals and uniform drainage of the formation, which led to a transition to multi-stage treatments that enable to increase the degree of formations involved into development and stabilize the flow rates. The key factors in selecting the technology, design solutions for the layout with frac-ports, and the results of laboratory studies of soluble balls, are considered. The experience of performing MSHF using a 114 mm diameter liner for a 178 mm production casing and testing an 89 mm diameter liner for a 140 mm production casing is presented. The obtained results confirm the high technological efficiency of the method, the reliability of the equipment and the stability of the technological process. Areas for further improvement of the technology are outlined, including design optimization, expansion of the scope of application to wells with smaller diameters, and the development of solutions for increased reservoir pressure conditions. The implementation of these measures shall improve the efficiency of developing hard-to-recover reserves and ensure the further development of MSHF technologies in offshore conditions.

References

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