RU37382U1 - DEVICE FOR CEMENTING AN EXTRA CASING - Google Patents

Description

OBJECT-DEVICE

Device for cementing additional

The proposal relates to the oil and gas industry, namely, to the construction and repair of wells, the casing of which has become unusable, and therefore their complete replacement is required.

A device is known for cementing a liner in a well (a.s. SU No. 1819986, MKI B 21 V 33/14, 1993), including an upper and lower tubular body with connecting threads, the last of which is equipped with a packing element, an anchor assembly, clamps and sub.

The disadvantage of this device is its high metal consumption and the complexity of manufacturing and assembly, as well as the complexity of the technological process of its application.

The closest in technical essence to the proposed is a device (Patent RU No. 2161241, IPC 7 E 21 V 33/14, 2000), containing a sealing unit including a housing with serrated notches, a packer mounted on the housing and consisting of a cuff, top an abutment connected to a sub by a shear element, a lower abutment and a non-return valve, a filling unit, comprising a housing with an installation sleeve inside.

The specified device to one degree or another has all the disadvantages noted above. In addition, it is complex in design, the location of the filling unit inside the sealing sharply reduces the flow area of the device, and the use of tapered tapered threads does not allow for a tight connection between the tubing and the device.

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upon its subsequent return to its original position, it does not provide the necessary tightness.

The objective of the utility model is to create a device with a simpler design, minimizing the narrowing of the borehole cross section, easy to manufacture and use, and more reliable in providing sealing.

The problem is solved by the proposed device containing a sealing assembly, including a housing, a packer mounted on the housing and consisting of a cuff and a check valve, a filling assembly comprising a housing with an installation sleeve inside.

What is new is that the casing of the sealing unit is provided with extensions on the top and bottom, while a check valve is installed in the lower extension, which passes from the bottom up, the base of which is attached to the hollow sleeve, which in turn is attached to the body of the sealing unit, while the fasteners are made by shear elements, and an expanding cone is inserted into the upper housing extension, connected to it by shear elements and with an angle at the apex sufficient to tightly press the nozzle against the walls of the casing, and with a diameter ohm of the base, smaller than the inner diameter of the nozzle in the working position and having an opening with a seat for a valve discharged from the mouth, the housing of the sealing unit being more plastic than the pipes of the additional casing string, equipped with a support sleeve located inside the installation sleeve, which in turn is installed in the inner a cylindrical groove of the body of the casting unit and is connected with it and with the body of the casting unit by differential shear elements.

It is also new that it is equipped with a cementing plug made in the form of self-sealing cuffs, while its lower part has a conical ledge and is made of hard, easily drilled material for interaction with the conical ledge of the support sleeve.

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Also new is the fact that the case of the sealing unit between the upper and lower extensions is equipped with longitudinal corrugations.

Also new is the fact that the expanding cone, the base of the non-return valve, and the supporting sleeve are made of easily drilled materials.

Analysis of the known similar solutions allows us to conclude that they lack features similar to the distinctive features in the claimed device, i.e. on the compliance of the proposed solutions to the criteria of "novelty and" industrial applicability.

In FIG. 1 shows a longitudinal section of the device before sealing.

In FIG. 2 shows a cross section AA of the sealing assembly of the device.

In FIG. 3 shows a longitudinal section of the device during the cementing process.

The proposed device includes two nodes: sealing 1 and filling 2.

The sealing unit 1 (see Fig. 1) consists of a nozzle 3, an expanding cone 4 with an angle of 5 (see Fig. 4) with an apex sufficient to tightly press the nozzle 3 against the walls of the casing 6, and with a base diameter 7 smaller than the inner diameter. 8 pipe 3 in working position. The bottom and top of the pipe 3 is equipped with extensions 9 and 10, while in the lower extension 9 is installed a hollow sleeve 11 attached to it with shear elements 12. Inside the hollow sleeve 11 is installed a check valve 13, which has a base 14 attached to the hollow sleeve 11 with shear elements 15. The non-return valve 13 passes from the bottom up.

On the outer surface 16 of the pipe 3, an elastic shell 17 is located, and in the upper extension 10 of the pipe 3 an expansion cone 4 is inserted, having an opening 18 with a seat 19 under the valve 20 discharged from the mouth.

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The pipe 3 between the lower and upper extensions 9 and 10 can be provided with nodol corrugations 22 (see Figure 2) to facilitate expansion of the pipe 3. The expanding cone 4 (see Figure 1) and the base 14 of the check valve 13 can be made of easily drilled materials, if necessary, further drilling.

The pipe 3 is more ductile than the pipe additional casing 23.

The upper extension 9 of the pipe 3 of the sealing assembly 1 is rigidly connected to the housing 24 of the casting assembly 2 (see FIG. 1), which, in turn, is connected to an additional casing 23. The housing 24 has radial holes 25, and an inner cylindrical groove 26, in which the installation sleeve 27 is located. Concentrically, inside the installation sleeve 27, a support sleeve 28 is installed having a tapered ledge 29. The support sleeve 28 and the installation sleeve 27 are connected to each other and the housing 24 by differential shear elements 30. Mated over bristle assemblies and parts are provided with sealing elements 31.

The device operates as follows.

The sealing 1 and pouring 2 nodes rigidly connected to each other on the additional casing 23 are lowered into the well, and installed in the non-worn section of the casing 6 (see Figure 1) with an undisturbed annular cement ring, confirmed by geophysical studies, while during the descent additional casing 23 is filled through the check valve 13.

Then create excess pressure inside the additional casing 23, which previously only distributes the pipe 3, approximating the cross section to the inner diameter of the casing 6, since the pipe 3 is made more plastic than the pipes of the additional casing 23.

casing string 6. Overpressure is raised in the additional casing string 23 until the shear elements 15 are destroyed and the sealing unit 1 is released from the base 14 and the check valve 13, which fall to the bottom of the well.

Then, a valve 20 (for example, a ball) is dropped from the mouth, which sits in the seat 19 of the expansion cone 4, blocking the hole 18. Then, overpressure is again created in the additional casing 23, as a result of which the shear elements 21 and the expansion cone 4 are destroyed (see Fig. 3) moves downward inside the upper expansion 10 until it sits at its vertex 5 at the top 5 on the upper conical ledge 32 of the pipe 3, while opening the radial holes 25 in the housing 24.

After checking for circulation, cementation begins. To do this, the estimated amount of cement is pumped into an additional casing 23, then a cement plug 33 is installed in the well and an overpressure is created in the additional casing 23 above the cement plug 33, as a result of which the cement plug 33 starts to move downwardly pushing the cement (see Fig. .3) through the radial holes 25 of the housing 24 into the annular space between the casing 6 and the additional casing 23. At a certain point, the cement plug 33 voim conical shoulder 34 sits on the tapered shoulder 29 of the supporting sleeve 28.

Further, the pressure continues to increase over the cementing plug 33, as a result of which the differential shear elements 30 are destroyed at the mounting location of the installation sleeve 27 with the housing 24, while the installation sleeve 27 and the support sleeve 28 are lowered down until the installation sleeve 27 rests against the end face of the upper expansion 10 of the pipe 3, as a result, the radial holes 25 in the housing 24 are reliably overlapped.

Again create excess pressure over the cementing plug 33, as a result of which the differential shear elements 30 are destroyed, are destroyed at the mounting point of the installation sleeve 27 with the support sleeve 28. With a further increase in pressure over

with a cementing plug 33, it pushes the expansion cone 4 through the support sleeve 28, which compresses the nozzle 3 due to its angle 5 (not shown in Fig.), as a result of this the nozzle 3 is finally firmly pressed against the casing 6, and the nozzle 3 located on the outer surface 16 elastic shell 17, fills all the irregularities of the casing 6. At a certain point, the expanding cone 4 under the influence of excessive pressure over the cementing plug 33 abuts against the hollow sleeve 11 located in the lower extension 10 of the pipe and 3 and destroy Shear members 12.

As a result, the hollow sleeve 11, the expanding cone 4 with the valve 20, the support sleeve 28 and the cement plug 33 fall on the bottom of the well, as evidenced by a sharp pressure drop on the pressure gauge of the pump unit.

The sealing unit 1 does not narrow the virally threefold cross-section of the additional casing 23, which subsequently does not complicate the descent of the necessary downhole equipment (not shown in Fig.) For subsequent operation of the well.

After waiting for the cement to harden, the necessary equipment is lowered into the well and its further operation is continued.

The proposed device is simpler in design, which allows to reduce material costs for assembly, descent, landing and cementing, which means it is easier to manufacture and use. All used units and parts are highly reliable. A relatively large flow area in the device zone is ensured, which guarantees the success of further work on the well.

Claims (4)

1. A device for cementing an additional casing string containing a sealing assembly including a housing, a packer mounted on the housing and consisting of a sleeve, and a check valve, a filling assembly comprising a housing with radial channels and an installation sleeve inside, characterized in that the housing of the sealing assembly above and below it is equipped with extensions, while a check valve is installed in the lower extension, passing from bottom to top, the base of which is attached to the hollow sleeve, which in turn is attached to the housing the sealing unit, while the fastenings are made by shear elements, and an expanding cone is inserted into the upper extension of the body, connected to it by shear elements and with an apex angle sufficient to firmly press the nozzle against the walls of the casing, and with a base diameter smaller than the inner diameter of the nozzle in the working position, and having a hole with a seat for a valve discharged from the mouth, the housing of the sealing unit being more plastic than the pipes of the additional casing string, equipped with a support sleeve, Assumption within the mounting sleeve, which in turn is mounted in the inner cylindrical bore and the body of the pour node coupled thereto and to the body of the pour node differential shear elements. 2. The device according to claim 1, characterized in that it is equipped with a cementing plug made in the form of self-sealing cuffs, while its lower part has a conical ledge and is made of hard easily drilled material for interaction with the conical ledge of the support sleeve. 3. The device according to claims 1 and 2, characterized in that the housing of the sealing unit between the upper and lower extensions is equipped with longitudinal corrugations. 4. The device according to claims 1 to 3, characterized in that the expanding cone, the base of the non-return valve, the support sleeve are made of easily drilled materials.