SU989040A1 - Valve arrangement for setting a packer - Google Patents

Description

(54) VALVE DEVICE FOR LANDING PACKER

The invention relates to the oil and gas industry and is intended for planting hydromechanical and hydraulic packers.

A valve device for landing a packer is known, which includes a housing with channels and a saddle with a gate 1.

When this valve device is made, it is not possible to carry out a tight fit of the hydromechanical and hydraulic packers, since when the packer passage is cleared from the saddle and shchar at the moment the stoppers are cut, a dynamic reactive force arises due to a sharp drop in pressure causing the packer to leak.

It is also known a valve device for fitting a packer, comprising a housing, a sleeve, connected with shear elements to the housing and forming an annular chamber with it, seats with stoppers and a bolt 2.

In such a device, if the pressure inside the tubing proves to be greater than the reservoir pressure (in most cases)

cases it happens), the overpressure, acting on the difference in the area of the casing, creates an axial force directed upwards. The magnitude of this force from overpressure (the difference between the pressures inside the pipe string and the reservoir) may be of such importance that the stiffness of the selected spring (permissible construction) does not ensure its overcoming and, thus, the release of the axial channel from the saddle. In such cases, a lot of time is required for additional tripping gear for disassembling and mounting the packer, which is associated with high annual costs per well.

The aim of the invention is to increase

The reliability of the device is due to the elimination of the effect of downhole pressure on its operation.

Claims (2)

The goal is achieved by the fact that in a valve device for landing a packer comprising a housing, a sleeve connected with shear elements to the housing and forming an annular chamber with it, a saddle with stops and a shutter, the sleeve is differential, installed inside the housing, an annulus 39 the incompressible fluid is filled and communicated with the space behind the body through a throttle hole, and the seat with the stoppers is installed inside the differential sleeve. The drawing shows a valve device, a general view of the section. The valve device comprises a coupling 1, a body 2 connected to it with an axial channel A and a differential sleeve 3, forming a chamber B filled with an incompressible 1st fluid. Throttling holes 4 are drilled in the housing 2, into which a non-metallic plug 5 and a fitting 6 are screwed to fill the incompressible fluid in the sealed chamber. In the windows of the differential sleeve 3, there are stoppers 7 that hold the saddle 8, and on the inside walls of the housing 2 there is a pocket B for sliding the stoppers in the radial direction. The differential sleeve 3 in the upper position is fixed by shear elements 9. To create tightness in chamber B and pressure in the valve device, sealing rings 10-12 and the closure 13 are provided. The valve device operates as follows. Prior to lowering the packer with the valve device, the crankbutcher 6 is turned away and the chamber B is filled with an incompressible fluid. After the packer is lowered to the required depth, the shutter 13 is discharged from the mouth and an overpressure is created in the pump compressor pipes. At a certain value of overpressure equal to the required pressure for the packer to fit, shear elements 9 and plug 5 are caged, differential sleeve 3 under the action of pressure, squeezing the incompressible fluid from chamber B through the throttling orifice 4, moves downwards. The volume of chamber B and the flow area of the slit of the lodging hole 4 are established experimentally in accordance with practical data, i.e. valve response time should be cooTBeTctBOBaTb for a packer landing time. The number of shear elements is established depending on the pressure, required by HE for planting the packer. After the packer is seated, the overpressure in the tubing is forced; 1no slowly decreases to zero. In this case, the differential sleeve 3 of the weight of the liquid column with the stoppers 7, the seat 8 and the shutter 13 forcibly moves downwards. When the stoppers 7 reach the pocket B, they move apart in the radial direction and release the saddles 8. At the same time, the saddle 8 and the bolt 13 detach from the stoppers 7 and fall to the bottom. If the pressure generated by the liquid column inside the tubing is not enough to overcome the friction of the O-rings 10 and I and to force the Incompressible fluid out of Chamber B, then an additional slight overpressure is created. The application of the invention allows an increase in the number and types of work carried out in the operation of wells, increase the reliability and operability of oilfield equipment, prevents additional tripping operations associated with high annual costs per well. Claims for fitting a packer comprising a housing, a sleeve associated with shear elements with the housing and forming an annular chamber with it, a seat with stoppers and a shutter, characterized in that, in order to increase the reliability of the device by eliminating the effect of bottomhole pressure on its work, the sleeve is made differential, is installed inside the case, the annular chamber is filled with incompressible fluid and communicates with the space behind the case through the throttle opening, and the seat with the stoppers is installed inside When differential sleeve. Sources of information taken into account in the examination 1. Authors certificate of the USSR No. 307177, cl. E 21 V 33/12, 1968. 2. Authors certificate of the USSR M 724690, cl. E 21 V 33/12, 1978 (prototype).