RU1809009C - Method for gas-lift well system operation - Google Patents

Description

v i: 4; The invention relates to a techno-lop. With n | e e1g1 1t4 nb1-x: p6radny; C-columns, a; g) with devices for starting them

:; :: - :: tffis The purpose of the invention is to increase the reliability of work by reducing the outwardness

th check valve .. -:.:. .. -: .x. :; ..-. ;;

 In FIG. 1 shows the operation of the device at the time of flushing the well before cementing it; figure 2 - tr, the moment prdmyyyky bkyazhiny during 03ts. .; -.;: yctpbflCTiBb consists of a disconnector having a housing 1 connected to the nb-power of the left-hand thread 2 with a funnel 3 screwed onto the upper end of the countersunk casing, and a check valve, - || NOVELNOGR in the lower part of the housing 1, S; the wall of the frame 1 is made of the main radial Holes 4, overlap shear

/ sleeve 5, fixed in the initial nof yoke with pins 6 (see figure 1). Sleeve S: placed in the axial channel 7 of the housing 1. Below the main holes 4 in the wall of the housing t, additional radial holes are made; versts 3 with a possibility of their overlapping. sleeve 5 after opening the main radio; otal holes 4 (see figure 2); For this, the axial channel 7 of the housing 1 is made stepwise, as a result of which an annular collar 9 is formed at the transition step. Below. The main radial holes 4 in the lower part of the housing 1 are equipped with a poppet check valve having a seat 10 and a spring-loaded locking element 11. To ensure reliable overlap of the additional radial holes, they are located from the valve seat 10 at a distance of at least a diameter up to V

filling holes 8, and the check valve is made with the possibility of opening it when the shear sleeve 5 moves after closing the last additional radial holes 8 of the disconnector body 1. At the top of the casing 1 there is a thread 12 for connecting to the drill string 13. The shear sleeve 5 is overlapped by a ball 14.

The device operates as follows; : -:; ... -. ....: /:, ...;. .; ..:;. ../.,.

The device is installed between a flush casing on which a funnel 3 is screwed and a drill string 13. After a flush casing is lowered into the well, flushing is performed. At this time, the entire flushing fluid flows through the axial channel 7 of the disconnector body T, with additional radial holes 8 and further into the cavity 15 of the countersunk casing. To prevent the check valve 10,11 from opening at this moment, the spring of the locking member 11 is selected so that the compressive force necessary to open the valve is greater than the hydraulic force at this time. After flushing the well, cement slurry is pumped into the drill string 13 and pushed into the annular space. After the drilling is completed, the drill string 13 is thrown ball 14, As soon as the ball 14 reaches the shear sleeve 5, it will block it. Excessive & - lei wash fluid is created. When the calculated value is reached, the pins 6 are cut off and the sleeve 5 is lowered down to fit onto the shoulder 9. In this case, the main radial holes 4 open and the additional holes 8 are sealed by the sleeve 5. This is ensured by the additional holes 8 being made in the wall of the housing 1 disconnector above the non-return valve at a distance from the seat 10 at least by the size of the diameter of the holes 8. Since when; moving down below the openings 8 the check valve opens, which is located under

sleeve 5 with ball 2 (see figure 2) liquid

pushed down under the valve. This ensures a guaranteed passage of the sleeve 5 to the shoulder 9. Through the openings

4, excessively raised Cement mortar is washed off and the well is flushed during OZ Ts. After OZK, by turning the drill string 13 to the right, the disconnector is disconnected from the funnel 3.

When lifting the drill string 13, together with it, the disconnector body 1 with the sleeve 5 and the check valve 1.0 is removed from the well, T., U.-.,.: .... .-.; ../:.: .-. .-.,:. Due to the fact that during the descent of the casing string in its lower part, it is not necessary to install check valves, and subsequently drill them and lose additional time to clean the bottom of the well from parts of the drilled valve,

all this reduces the cost of well construction. And since the non-return valve is not susceptible to erosion, this ensures its tightness and prevents the appearance of oversized cement glasses, for which it is also necessary to drill, to lose additional time.

Claims (1)

SUMMARY OF THE INVENTION Flushing casing lowering device including a disconnector, comprising a housing with main radial holes in the wall, blocked from the inside by a shear sleeve and a poppet check valve installed in the lower part of the body under the shear sleeve, which is included in order to increase the reliability of operation due to to reduce the wear of the check valve, in the wall of the disconnector body above the check valve additional holes at a distance from the valve seat less than the height of the shear sleeve at least by the diameter of the additional radial holes, and the check valve is made to open when the shear sleeve moves after closing the last additional radial holes of the disconnector body. FIG. 1.