RU1812303C - Valve gear for casing strings - Google Patents

Abstract

Usage: adjustable self-filling of the casing string with borehole fluid when attaching oil and gas wells. SUMMARY OF THE INVENTION: the device comprises a locking element of a throttle assembly made in the form of a pivotally mounted spring-loaded plate with a calibrated axial hole and concentrically mounted in the latter with the possibility of axial movement of the spring cone with a calibrated axial hole. In addition, it comprises a throttle assembly housing mounted in the axial channel of the disc and associated with the last shear elements. 1 s.p. f-ly, 4 ill.

Description

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The invention relates to devices used for attaching oil, gas and other wells, and is intended for controlled self-filling of the casing string with borehole fluid, reducing hydrodynamic pressure on the walls of the borehole, reducing the weight of the casing and preventing the backward movement of the drilling or cement slurry from the annulus space to the column.

The aim of the invention is to increase operating efficiency by improving flushing and adjusting the filling of the column with drilling fluid, as well as creating a universal (for hull and open housing) design.

This is achieved by the fact that the device is equipped with a throttle assembly, the locking element of which is made in the form of a pivotally mounted spring plate with a calibrated axial hole and concentrically mounted in the latter with the possibility of axial movement of the spring cone with a calibrated axial hole.

The throttle assembly body is mounted in the axial channel of the disk and is connected to the last shear elements.

In Fig, 1 shows the proposed valve device mounted in the housing during the descent of the column; in FIG. 2 - the same, mounted between the screwed casing pipes in the process of lowering the string; in FIG. 3 is the same during flushing and cementing; in FIG. 4 - same after cementing the casing.

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The valve device for casing strings (Fig. 1) consists of a disk 1, threaded to a body 2, in case of a body design, a throttle assembly including a body 3 with a passage channel connected to the disk by shear elements 4, and mounted on it. latch 5 and articulated hinged plate 6; with a spring 7. The valve 6 has a calibrated hole 8, partially blocked by a movable throttle 9 mounted on a spring-loaded plate 10. The movable throttle is made in the form of a truncated cone 11 with a calibrated bore 12. The valve device contains a locking plate 13, spring-loaded spring 14 and a throw ball 15 to control the locking plate. When removing the throttle assembly freed from fixing plate 13 reliably blocks the passage channel 17 on the surface 16.

The valve device may be open (see figure 2) and mount it in the coupling 18 between the connected casing 19.. : ....; . ..; ...;

The operation of the inventive valve device is as follows.

The casing with the valve device in the casing or in the open-frame version is lowered into the well without a ball. In this case, the column is continuously regulated to fill with liquid through the throttle hole 12 and the annular section.

As a result of the pressure drop under the valve: device and above it, the movable throttle-9 will move upward, decreasing the annular cross-section due to the conical surface 11 until it completely overlaps. After that, the solution will enter the column only through the calibrated throttle bore 12. When the pressure is equalized under the influence springs 10, the movable throttle 9 will return to its original position. The possibility of clogging the holes is reduced to a minimum. If it happens, then washing will be eliminated, tk. In this case, the main flow of the solution will pass through the holes of the throttle assembly, which is located concentrically to the device body (casing). When the well is periodically washed and cemented (Fig. 3), the hinged plate 6 will turn under the influence of the flow of the solution, taking it to a position that does not prevent carrying out the indicated technological operations. After their completion, the hinged plate with the throttle will return to its original position under the influence of the spring 7.

After lowering the casing to the design depth before cementing in

a ball 15 is lowered into the internal cavity of the column, which is transported by a fluid flow to the valve device until it enters the throttle assembly 3, blocking the main channel 17 and, as a result of the pressure created in the column, elements 4 are cut off. In this case, they lost contact with the disk 1 , the body of the throttle assembly 3, with a hinged plate 6 fixed to it, a movable throttle 9,

the retainer 5 and the ball, under the influence of the flow of the solution, are transported to the bottom of the well. Freed from the fixed state (Fig. 4), the locking plate 13 under the influence of the spring 14 reliably overlaps the main channel 17 on the surface 16. Preventing the backward movement of the solution from the annulus into the column ..,; .- .-, ;;. .. -: ..-. ,.:.; ...; .- ... Feasibility

the device is achieved by saving time on lowering the casing string into the well, taking into account the lack of topping, improving the quality of cementing, reducing metal consumption and laboriousness; ... .. -.

Formula 1. Valve for casing, including a disc with an axial channel and a seat pivotally mounted on

a spring-loaded poppet valve located under the disc, a throttle assembly comprising a housing with a passage channel, a seat in the upper part for a throw ball, a saddle in the lower part for a locking element and a retainer for the initial position of the spring-loaded poppet valve connected to the housing e its in that, in order to increase work efficiency by improving

flushing and regulating the filling of the column with drilling fluid, the locking element of the throttle assembly is made in the form of a pivotally mounted spring plate with a calibrated axial hole and concentrically mounted in the latter with the possibility of axial movement of the spring cone with a calibrated axial hole.

2, The device according to claim 1, with the proviso that the throttle assembly body is installed in the axial channel of the disk and is connected to the last shear elements.

Editor

Compiled by A. Ladyga Tehred M. Morgenthal

FIG. B

Proofreader N. Milyukova