SU968329A1 - Apparatus for sealing-away the annulus of well - Google Patents

Description

The invention relates to equipment used in the drilling of wells, in particular to packer devices designed to seal the annulus between the knee filling pipes and the walls of the well, and can be used to eliminate the absorption zones of the washing solution with cement mixtures.

A device for sealing the annulus of the well, comprising a housing, a yoke, a movable sleeve with a saddle, a valve and a sealing element 1.

The device does not allow isolation of the absorption zone by the cement slurry pumped between the plugs into the well interval.

It is also known a device for sealing the annulus of a well, comprising a housing with windows and a sub in the lower part, a thrust nut, a self-sealing cuff, a movable sleeve with a saddle, a yoke connected to the movable sleeve by rings 2 passed through the housing windows.

(However, this device isolates the interval of the well only at its bottom and does not ensure the separation of the well

wells when injecting a plugging solution into the absorption zone of any part of the wellbore.

The aim of the invention is to increase the reliability of operation when isolating the absorption zone with a temporal solution injected between the separator plugs.

The goal is achieved by

10 that the lower end of the sleeve is made with slots, thrust protrusions under the discharge plug and a conical bore on the inner surface at the end, and inside the sub is mounted

15 ring stop with an outer conical surface under the bore of the sleeve.

The drawing shows a device for sealing the annulus of the well.

20

The device consists of a body 1, a stop nut .2, C 1 of the sealing sleeve 3, a movable sleeve 4, which cooperates with the fingers 5 through the windows 6 of the body with the movable

25 with the sleeve 7. The sleeve 7 is fixed in the housing with shear pins 8. In the sleeve there is a tapered saddle 9 for a locking element (not shown).

Claims (2)

In the lower part of the sleeve, there are axial slots S and inner bore 11. The housing is connected to the sub 12, which is also a centralizer, inside which there is an annular abutment 13 with an outer conical surface. Sealing rings 14 are provided for sealing the windows b. The device is connected to the primer by threaded connections. The operation of the device is as follows. The device in the layout of the casting tube is lowered into the well to the required depth, after which a cement grout is pumped into the absorption zone between the two separation plugs through the filler pipe. The separating plugs are designed in such a way that the lower stopper passes through the device without any help, and the upper one with its stop element sits in the saddle 9 of the sleeve 7, blocking the passage channel. As a result of the force, due to the increase in pressure of the washing liquid, the pins 8 are cut off above the plug and the sleeve moves downwards. At the same time, the sleeve 4 is also shifted downward, freeing the manure .3, which receives the working position, adjacent to the walls of the well and seals the annular space. Since the cuff is not in contact with the walls of the well in the transport position when the device is lowered into the well, there is no wear and damage to the cuff. As a result, the reliability of sealing the annulus during operation of the device is improved. Under the influence of pressure from the fluid above the top plug, the sleeve continues to move downwards and with its taper bore 11 slides against the stop 13. The spring petals of the sleeve are bent to the sides, increasing the flow area of the sleeve saddle, which ensures further free movement of the plug to the lower end of the filling pipes. Since the annular space is sealed at the same time, the cement slurry is pushed only into the absorption zone, which prevents the BfcBue from entering the lower end of the filling tubes and the possibility of sticking them. When installed in the lower part of the pouring pipes, shear stop rings at the moments of separating plugs landing on them can be obtained by dividing the jumps of the information on the source and the end of the output of the cement slurry from the pouring tubes. Such information allows the cement slurry to be pushed into the absorption zone with simultaneous lifting of the filling tubes from the bottom to the top of the absorption zone and higher while simultaneously sealing the annular space while coordinating the lifting speed with the volume of the cement slurry, the productivity of the push and the power of the absorption zone. Thus, with the use of the proposed device, the effectiveness of the liquidation operations is improved, the consumption of grouting materials is reduced, and the likelihood of sticking of the pouring pipes is reduced. Since, in the transport position, when the device is lowered into the well, the man5ket does not contact the walls of the casing string, wear and damage to the cuff does not occur. As a result, the reliability of sealing the annulus during the operation of the proposed device increases. Apparatus of the Invention A device for pressurizing the annulus of a well, comprising a housing with windows and a sub in the lower part, a stop nut, a self-sealing cuff, a movable sleeve with a saddle, a sleeve connected to the movable sleeve with fingers through the body housing, characterized in that In order to increase the reliability of the work in isolating the absorption zone with cement slurry pumped between the separation plugs, the lower end of the sleeve is made with slots, thrust projections under the discharge plug and Nose bore on the inner surface at the end, and inside the sub there is an annular abutment with an outer conical surface under the bore of the sleeve. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 543738, cl. E 21 V 33/12, 1972. 2. USSR author's certificate number 199056, cl. E 21 V 33/12, 1965 (prototype).