RU150239U1 - Coupling Cementing - Google Patents

Abstract

The utility model relates to the field of the oil and gas industry, namely, to the rigging of casing strings and can be used in the construction of wells for oil and gas production. The technical task of the utility model is to create a reliable cementing sleeve, devoid of the likelihood of failure in work due to the failure to open the cementing windows due to the stop of the plugs in the wall in horizontally directed wells. The problem is solved by the use of membrane plugs in the coupling, made on the principle of a knock-out (bursting) membrane. The use of such membrane plugs guarantees the operation of the coupling and subsequent cementing at any annular gap between the outer diameter of the coupling and the borehole wall.

Description

Cement coupling

The utility model relates to the oil and gas industry, namely, casing rigging. The cementing sleeve is part of the suspension equipment column (liner) and can be used in the construction of wells for oil and gas production.

The coupling is intended for well cementing and eliminating the impact of aquifers on productive formations and should provide:

- communication annular and intra-annular space when flushing and cementing the casing;

- sealing annular space from the inner annulus at the end of the cementing process.

The success of the cementing process is determined mainly by the high-quality and reliable operation of the cementing coupling.

A known coupling for step cementing of casing strings (patent RU 2129207 IPC ЕВВ 33/14, published on 04/20/1999). The device includes a housing with lateral circulation openings, which are closed by cylindrical plugs with a seal and shear calibrated studs, upper and lower bushings, squeezing and locking dividing plugs, and an overlapping device in the form of a falling plug.

A disadvantage of the known technical solutions is that the cement coupling, mounted on a horizontal section of horizontally directed wells, may not work when activated if the annular gap between the outer diameter of the coupling and the wall of the well is less than the height of the plug, and the orientation of the activated cementing window on the wall of the well, due to the fact that the cylindrical plug will not be able to exit the coupling housing window (it will rest against the borehole wall).

The inventive utility model gives a technical result, which is expressed in the guaranteed response of the coupling for any annular gap triggered cementing window (between the outer diameter of the coupling and the wall of the well).

Devices with the claimed combination of distinctive features in the patent and scientific literature are not identified. This determines the compliance of the utility model with the criterion of "novelty."

The essence of the invention and the principle of operation of the proposed utility model is illustrated by the drawing, which shows the cementing coupling.

The cementing sleeve includes: a hollow cylindrical body 1, with radial cementing windows 2 made therein, a lower 3 sub, a receptacle 4, a piston 5, with radial cementing windows 6 made in it, which are oriented opposite the cementing windows of the housing with a guide screw 7, non-return valve 8, membrane plugs with an annular groove — a membrane of design thickness 9, external plugs 10, shear screws 11, piston sleeve 12, sleeve 13, shear screws 14, snap rings 15.

Coupling cement works as follows. A locking ball (not shown) is thrown inside the column, which, upon reaching the seat of the landing sleeve (not shown), blocks the channel. Intracolumn pressure rises and, when the calculated value is reached, the screws 11 are cut off first and then the plugs 9 of the membrane are triggered (ruptured) with the plugs 10 removed. For a guaranteed passage of the torn membrane, a larger diameter cavity is made in the membrane plug. The difference from the analogue presented above is that the membrane plugs will work for any orientation of the cementing window in the annular gap between the coupling and the borehole wall. After rupture, the membrane does not overlap and the cementing channel, which also has a guaranteed larger cross section. Well cementing is performed through the opening cementing window 2. After cementing is completed, cementing windows are closed either by applying annular pressure to the piston 5, or by using a cleaning plug (not shown) that sits in the receiving socket 3. To protect the membrane plugs from mechanical influences during the descent into the well, plugs 10 are installed in the cementing windows 2.

The introduction of cementing couplings with the claimed design of membrane plugs will allow avoiding emergency situations associated with not opening cementing windows with small annular gaps between the outer diameter of the coupling and the borehole wall.

The cementing coupling of the proposed design passed bench and industrial tests and showed operability in operation.

Claims (3)

1. Cement clutch, consisting of a hollow cylindrical body with radial cementing windows made in it, a lower sub, receiving receptacle, piston with radial cementing windows made in it, cementing window caps, check valve, characterized in that in the cementing plug clutch there are membrane cementing windows installed in the piston opposite the cementing windows of the housing are made on the principle of knockout - bursting disc. 2. The cementing sleeve according to claim 1, in which the membrane plugs have an annular groove of the estimated thickness. 3. Cementing coupling according to paragraphs. 1 and 2, in which the membrane plugs have a cavity for the output of the bursting membrane is guaranteed a larger diameter.

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