Experimental research on the sealing ability of borehole packers
Keywords:borehole packer, selfsealing ring, contact pressure, blowout preventer, wellhead equipment, shear modulus
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.
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Copyright (c) 2016 Maksym Dorokhov, Ivan Kostriba, Volodymyr Biletskyi
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