Experimental research on the sealing ability of borehole packers

Authors

DOI:

https://doi.org/10.15587/1729-4061.2016.74831

Keywords:

borehole packer, self­sealing ring, contact pressure, blowout preventer, wellhead equipment, shear modulus

Abstract

With the use of a full factorial experimental design based on a Box­Hunter rotatable central composite plan for second order response surfaces, it was possible to obtain a statistical mathematical model of the impact of the diametrical tension, the test pressure, and the radial clearance between the thrust bush and the casing as well as the shear modulus of the material on the amount of contact pressure, which is represented by a polynomial of the second order. The research was carried out on the laboratory model of the PJSC “Ukrnafta” (Poltava, Ukraine). The analysis of this model shows that an essential impact on the sealing ability of the self­sealing ring (the value of contact pressure) is made by the following series of factors: the test pressure, the diametrical tension, the radial clearance, and the shear modulus of the compaction material. Moreover, the test pressure factor is characterised by nonlinearity, which manifests itself in intersections of the hypersurface response.

The study has experimentally determined the patterns of distributing contact pressure along the length of the conjugate surface between the ring and the casing, characterized by a decreasing contact pressure from the edge of the working bite to the supporting section of the ring.

The research has demonstrated that it is possible to manage directly the sealing ability of borehole packers, particularly by changing the geometric parameters of the packer compaction.

Author Biographies

Maksym Dorokhov, Yurii Kondratiuk Poltava National Technical University Pershotravnevyi ave., 24, Poltava, Ukraine, 36011

Assistant

Department of Oil and Gas Industry

Ivan Kostriba, Ivano-Frankivsk National Technical University of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

PhD, Associate Professor

Department of Oil and Gas equipment

Volodymyr Biletskyi, Poltava Yurii Kondratiuk National Technical University Pershotravnevyi ave., 24, Poltava, Ukraine, 36011

Doctor of Technical Science, Professor, Full member of the Academy of Mining Sciences of Ukraine, Head of the department

Department of Oil and Gas Industry

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Published

2016-08-24

How to Cite

Dorokhov, M., Kostriba, I., & Biletskyi, V. (2016). Experimental research on the sealing ability of borehole packers. Eastern-European Journal of Enterprise Technologies, 4(8(82), 56–62. https://doi.org/10.15587/1729-4061.2016.74831

Issue

Section

Energy-saving technologies and equipment