SU1573134A1 - Check valve for drilling column - Google Patents

Abstract

The invention relates to the drilling of oil and gas wells. The goal is to simplify the process control valve operation. It contains a housing 1, in which it is installed with the formation of two annular cavities of a step sleeve (H) 2 with a saddle 3, a thrust flange 4 and circulating openings 16 and 17 arranged above them. The device has a floating locking member 6 mounted in the cavity of the guide sleeve 5, forming with the inner surface of the G 2 jet ring pump. The receiving chamber 13 of the pump is hydraulically connected to the cavities between the sleeve 5 and the organ 6, which forms two chambers 9 and 10 with the sleeve 5. The holes 16 and 17 overlap the overflow plugs 19. In the wall D 2 a channel 18 is made, which hydraulically connects the upper 14 ring the cavity between the housing 1 and G 2 with the chamber 13. As a result of the pump and the suction of the solution and the chambers 9,10 and the cavity 14 through the channel 18 into the chamber 13, the pressure in the chambers 9,10 starts to decrease and the organ 6 moves to the lowest position. This prevents further movement of G 2. In this position, the openings 17 overlap the walls of the housing 1 and the valve begins to work as a reverse. 2 Il.

Description

pa with cavities between sleeve 5 and body 6, forming two chambers 9 and 10 with sleeve 5. Holes 16 and 17 intersect bypass plugs 19. A channel 18 is made in wall G 2, which connects the upper cavity 14 hydraulically between the annular cavity 1 and G 2 with Chamber 13. As a result of the pump and the solution of the solution from the chambers 9, 10 JQ

and the cavities 14 through the channel 18 into the chamber 13, the pressure in the chambers 9, 10 begins to decrease and the organ 6 moves to the lowest position. This prevents further movement of G 2. In this position, the openings 17 overlap the walls of the housing 1 and the valve begins to work as the reverse. 2 ID

This invention relates to drilling.

oil and gas wells, in particular to valve-cutters installed in the lower part of the drill string to prevent the release of drilling mud and formation fluids through the drill string during oil and gas flows.

The purpose of the invention is to simplify the process control valve operation.

FIG. 1 shows a check valve in idle state during the descent of the drill pipe into the well, a section; in fig. 2 - the same, in the working state of the circulation of the solution in the drill string.

The check valve includes a housing 1c with connecting threads, a stepped sleeve 2, inside of which a saddle sleeve 5 is fixed below the seat 3 on the thrust flange 4, forming an jet ring pump with the inner surface of the sleeve 2. In the central channel of the sleeve 5 there is a floating valve block 6, consisting of a hollow rod 7 and a threaded plug 8. The valve body with the sleeve forms two chambers 9 and 10, which are hydraulically connected through axial 11 and radial 12 channels to the receiving chamber 13 of the jet pump . The step sleeve 2 forms with the case 1 two annular cavities — the upper 14 and lower 15. The sleeve walls have circulation holes 16 and 17, as well as channel 18, which provides a hydraulic connection of the strips 14 to the receiving chamber 13 of the jet pump. The upper circulation ports 16 are blocked by overflow plugs 19, which allow the solution to bypass from bottom to top. Between the sleeve 2 and the stop flange 4 there is a retaining ring 20, under which a groove 21 is made in the housing. Germe

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The sleeve 2 is tissed against the housing 1 with sealing rings 22.

The valve operates as follows.

In the drill string assembly, the valve is lowered into the well. During the descent, the valve passage is closed with a floating shut-off valve, and the solution from the well enters the pipes above the valve through the holes 17, the cavity 15 and the holes 16, opening the bypass plugs 19. When the solution is fed into the drill pipes, the holes 16 are blocked by the plugs 19 and the solution flows to the bottom of the well only through the Central channel, pressing the locking body 6 of the check valve. As a result of the operation of the jet pump and solution suction, from chambers 9 and 10 and cavity 14 through channel 18 into the receiving chamber 13, the pressure in said chambers and cavity starts to decrease and the locking member 6 moves to the lowest position. At the same time, due to the force exerted by the hydraulic resistance to the flow of the solution, the sleeve 2 also moves to the lowest position. In this case, the retaining ring 20 falls into the groove 21, thereby excluding the axial movement of the sleeve 2. In this position, the holes 17 overlap (. The walls of the housing 1 and the valve starts to work only as; reverse.

Claims (1)

By varying the depth of the threaded plug 8 into the hollow rod 7, the buoyancy of the locking element 6 is necessary, taking into account the density of the drilling mud for each particular case of use of a check valve. Invention Formula A check valve for a drill string, comprising a housing installed in the housing with the formation of two rings Composed by V. Rodinsg Editor G. Gerber Tehred M. Hodanich Order 1627 Circulation 472 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 FIG. 2 Proofreader N.Korol Subscription