Drain valve to prevent spillage of liquid-gas mixture during tubing pulling

UDK: 622.276.53.057

DOI: 10.24887/0028-2448-2026-7-51-53

Key words: well, downhole pumping equipment repair, borehole liquid spillage, drain valve, pusher rod, sucker rod string, tubing, split ringr

Authors: K.M. Garifov (TatNIPIneft, RF, Almetyevsk); A.Kh. Kadyrov (TatNIPIneft, RF, Almetyevsk); A.V. Glukhoded (TatNIPIneft, RF, Almetyevsk); V.A. Balboshin (TatNIPIneft, RF, Almetyevsk); I.G. Garaev (TatNIPIneft, RF, Almetyevsk); A.A. Lutfullin(Tatneft-Dobycha JV, RF, Almetyevsk)

In oil production, a drain valve is used to prevent spillage of borehole liquid onto the surface during the pulling of downhole pumping equipment. This valve connects the tubing to the annulus in wells operated by sucker rod pumps. Liquid from the tubing flows into the annulus, and the levels in them equalize. An analysis of existing liquid drainage options was performed, and their application areas and disadvantages were identified. A valve for liquid drainage from the tubing was developed for wells equipped with sucker rod pumps. The sleeve locking system is made as an elastic split ring mounted in the radial groove of the sleeve and sequentially interacting with two corresponding radial grooves provided on the inner surface of the body. Elastic seals are rigidly mounted to the sliding sleeve and the body. The tubing hole is made in the groove with bevels. The pusher rod is installed on the sucker rod between two joints and is made as a sleeve with elastic protrusions sized to secure it inside the tubing string. The elastic protrusions ensure tight fit of the pusher rod through the sleeve. The technical result is achieved through simplification of the valve, its assembly, and improvement of durability. Various types of sleeve fixation inside the body of the drain valve were studied. The material and the form of the pusher rod were selected. Acceptance tests demonstrated the effectiveness of the drain valve, and it is recommended for deployment on other wells of TATNEFT PJSC.

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