SU740935A1 - Borehole-cementing arrangement - Google Patents

Description

I

The invention relates to the field of drilling wells, in particular to devices for cementing casing strings. It can also be used in the abandonment of wells, the installation of separation bridges.

A device for cementing wells, comprising a funnel-shaped flexible cuff fixed on the casing with by-pass holes, and a valve 1 are known.

A disadvantage of the known device is the low tightness when cementing wells with pressurized aquifers.

A device for cementing wells is known, which contains a fastening ring with oppositely directed funnel-shaped cuffs fixed on it and a tubular body with filling channels made by Bbiuje fastening ring 2 |.

When using a known product, it is possible to mix the liquid or formation water with the cement mortar, resulting in a decrease in the strength and sealing properties of the cement stone, and the clay on the walls of the well prevents the adhesion of the cement stone to the rock.

The aim of the invention is to improve the quality of cementing by preventing cement slurry with fluid in the well.

The goal is achieved by the fact that the device is equipped with an additional funnel-shaped cuff mounted on the body with axial displacement, a hollow movable piston and casing mounted concentrically in the body, the casing being rigidly connected to the piston and covering the device cuffs, and the additional cuff

20 scrappers.

Claims (1)

FIG. 1 shows a device, the general view of FIG. 2 - the descent of the device into the well in FIG. 3 - the moment of the beginning of 37 cementation; in fig. 4 - the position of the device at the time of the solution in the aatrub space; in fig. 5 position of the device at the time of cementation The device is lowered on the drill pipe or compression pipe 1, connected by a sub 2, having a left-hand thread, with the rod 3. The rod 3 is connected to the housing- coupling 4, inside which is a piston 5, wire scrapes & 6 are fastened on the movable fastening ring 7, mounted on the coupling housing and freely moving along the housing. A funnel-shaped flexible cuff 8 is fastened to the movable fastening ring 7, and two funnel-shaped flexible cuffs 10 and 11. To the fixed fastening ring 9 12, the strips 13 of sheet steel are fastened. In the housing of the coupling, bypass windows t4 are provided. The piston 5 is rigidly connected to the cylindrical housing 15, which holds the flexible cuffs in the transport position. The work is carried out as follows. The device is lowered into the well, for example, into the roof of the pressure horizon, on the drill pipe 1, connected by sub 2 to the rod 3. After washing the well with a clay mortar with the specified parameters, proceed to cementing works, for which the required calculated volume of cement mortar pipes between two, lower and upper, traffic jams. When the lower plug is seated on the bore of the piston 5 and with a further increase in pressure, the piston 5 is displaced downward, while the casing 15 is displaced simultaneously with the piston. When the piston reaches the 5th lower position, the cement slurry is forced through the bypass ports 14 into the space between the cuffs 8 and 10, while moving the flexible cuff 8 together with the movable fastening ring 7 all the way into the sub 2. borehole walls.- After this, the pipes I, having left threads in the sub, are turned away and removed to the surface, and the borehole is installed until 8, if several pressure horizons overlap the second device in the borehole • For cementing into the roof of the second horizon, and in the non-injected part of the well, cement is pumped in the usual way to the mouth. The intervals of aquifers are filled with the material of the same rocks as the rocks of these horizons, such as gravel or sand. With the use of a cementing device, the cement stone is reliably isolated from the filtration effect of energetic aquifers with flexible cuffs. Claim 1, A device for cementing a well, comprising a fastening ring with opposing funnel-shaped cups rigidly attached to it and a tubular body with filling channels formed above the fastening ring, characterized in that, in order to improve the quality of cementing by preventing the cement slurry from mixing fluid in the well, it is equipped with an additional funnel cuff mounted on the body with the possibility of axial movement, concentric copulating in the hollow housing a movable piston and a casing, wherein the casing is rigidly coupled to the piston and device covers cuff 2, apparatus according to claim, I, characterized in that the sleeve is equipped with an additional skpebkami. Sources of information taken into account in the examination of 1, Dubrovsky B, B, and others. Handbook of drilling and equipping water wells, M, Nedra, 1972, p. 276-277. 2, Leshchev D, A. Separation tamponage in wells, Gostekhizdat, 1963, p. 9-15. tgd