RU158968U1 - DEVICE FOR NIZA OF A STEEL POLYMER-FREE COUPLING FLEXIBLE PIPE FOR OPERATION OF A WELL WITHOUT MUCHING - Google Patents

Abstract

The bottom device of a steel-polymer sleeveless flexible pipe for operating a well without killing, consisting of a collet-fitting device, a spring centralizer and a funnel guide, sequentially placed on a steel-polymer sleeveless flexible pipe, while the collet-fitting device includes a housing with an insert fitting and a shank, a clamping ring and a union the nut, the guiding funnel with the landing saddle consists of two parts - the upper with the landing saddle and the lower, between which a bursting disc is located, the lower part of the guide funnel is spherical in shape and chamfers are made at the inlet, the upper and lower parts of the guide funnel are bolted together, while the guide funnel is screwed onto the shank of the collet fitting device, the spring centralizer is freely placed between the collet fitting device and the guide funnel , and the steel-polymer sleeveless flexible pipe is tightly mounted on the body fitting of the collet-fitting device and secured with a clamping ring and a union nut of the collet-fitting th device.

Description

The utility model relates to the oil and gas industry, in particular, to the construction of a steel-polymer sleeveless flexible pipe (SPGT), namely to the layout of the bottom of the SPGT during the operation of the well at a late stage of field development, without killing it.

At a late stage of field development under conditions of abnormally low reservoir pressure (AAP), one of the main problems in production is the retirement of wells into an inactive reservoir. The accumulation of condensation water at the bottom of the wells and the presence of formation water in the produced products leads to the destruction of the bottom-hole zone of the formation, the formation of sand-liquid plugs at the bottom and a decrease in productivity and production rate of the wells.

Under ANPD conditions, to ensure uninterrupted operation of the well, it is necessary to exclude accumulation of liquid at the bottom, and for this, a central lift column (CLC), which is a pipe of a smaller diameter, concentrically located inside the main lift column (OLK), should be installed in the well. The most suitable pipe to achieve this goal can be a flexible pipe used in the overhaul of wells, but having a short life. Therefore, this requires a similar pipe with a long service life of at least 20 years, such as a steel-polymer flexible pipe (SPGT) [Robin A.V., Donchenko M.A. Concentric elevator columns based on a steel-polymer pipe (removal of water from the bottom of gas wells without killing them) // Oil. Gas. Novation. 2013. No. 7. - S. 40-45].

Traditional methods do not allow the installation of SPGT without killing the well, which in turn can lead to mudding of the bottom-hole formation zone (PZP) and the impossibility of further operation of the well.

A device is known for transferring wells, including waterlogged, to operation in two lift columns, containing the main lift column, the central lift column, the lower part of the fountain valves with an over-the-gate valve, as well as wellhead piping with a control complex for monitoring and controlling the operation of the well, tripping device and injector, a flexible polymer pipe, including a reinforced pipe, is used as a central lift column, there is a two-chamber sealant consisting of the upper chambers s with two hydraulic cavities (opening and closing), there is a preventer, at the beginning and end of the central elevator column, the upper and lower tips are sealed, respectively, a controlled valve installed between the volumes of the main and central elevator columns is rigidly and hermetically connected, there is a plug, in the plug and in the upper tip, nodes of a rigid detachable axial interconnection are made, there is a technological rod, in the technological rod and in the plug nodes rigid axial mutual releasable coupling, the central tube holder has a groove the tubing (with radial fastening elements) [Pat. 128896 RF; publ. 06/10/2013].

The disadvantage of this device is the insufficient reliability of the controlled valve due to its design features (three-position design), which will not perform its functional tasks of variable opening and closing after long-term operation of the well due to the ingress of mechanical impurities carried by the gas stream from the well.

In addition, the insufficient centering of SPGT in vertically curved or deviated wells, which affects the reliability of the well, in particular when removing research equipment or downhole tools from the well.

In addition, the disadvantage of this device is the difficulty of attaching SPGT to the lower end element for attaching a controlled valve to it, which consists in pressing the lower end element to the pipe.

The task to which the claimed technical solution is directed is to develop a bottom layer of SPGT, the design of which will allow technologically to alternately overlap and open the through hole of the SPGT.

The problem is solved by achieving a technical result, which consists in increasing the technological reliability of the device by temporarily blocking its bore hole with a bursting disc and then restoring the bore hole after rupture of the membrane under the action of excess pressure created in SPGT, and in re-blocking the bore hole with a ball, discharged from the wellhead and sits in the landing saddle, as well as by centering the central lift column (CLC) at the base lift column (OLK).

The specified technical result is achieved by the fact that the bottom of the steel-polymer sleeveless flexible pipe for operation of wells without jamming consists of a collet-fitting device, a spring centralizer and a funnel guide, which is sequentially placed on the steel-polymer sleeveless flexible pipe, while the collet-fitting device includes a housing with an insertion fitting and a shank, a clamping ring and a union nut, a guiding funnel with a landing saddle consists of two parts - the upper with the landing saddle and the lower, m waiting for the bursting membrane to be placed, the lower part of the guide funnel is made spherical, and chamfers are made at the inlet, the upper and lower parts of the guide funnel are bolted together, while the guide funnel is screwed onto the shank of the collet fitting device, the spring centralizer is freely placed between collet-fitting device and guide funnel, and the steel-polymer sleeveless flexible pipe is tightly mounted on the body fitting of the collet-fitting device and secured with clamping ring and a cap nut-fitting collet device.

In FIG. 1 schematically shows the design of the bottom device of a steel-polymer sleeveless flexible pipe at the time of blocking the passage opening with a hollow bursting disc; in FIG. 2 - wiring diagram of the assembly of the claimed device; in FIG. 3 shows the design of the device at the time of overlap of the landing seat, discharged from the wellhead by a ball.

The bottom device of a steel-polymer sleeveless flexible pipe for operation of wells without jamming consists of a collet-fitting device 2, a spring centralizer 3 and a funnel 4 that are sequentially placed on the SPGT.

Collet fitting device 2 includes a housing 5 with an insertion fitting 6 and a shank 7, a clamping ring 8 and a union nut 9.

Guide funnel 4 consists of two parts - the upper, with a landing seat 10 made in it under the ball, and the lower. A rupture disk 11 is placed between these parts. The lower part of the guide funnel 4 is made spherical, and the chamfers are made at the inlet 12. The upper and lower parts of the guide funnel 4 are interconnected by bolts 13. In this case, the guide funnel 4 is screwed onto the shank 7 of the collet body 5 -fitting device 2.

The spring centralizer 3 is freely placed between the collet fitting device 2 and the guide funnel 4.

SPGT 1 is tightly mounted on the fitting 6 of the housing 5 of the collet fitting device 2 and secured with a clamping ring 8 and a union nut 9.

The device is mounted as follows.

A clamping ring 8 and a union nut 9 are put on the lower end of the SPGT 1, which is lowered into the well. A fitting 6 of the housing 5 is tightly inserted into the lower end of the SPGT 1. Then, a clamping ring 8 is put on the junction of the collet-fitting device 2 with SPGT 1 and fixed connection point with union nut 9.

A bursting disc 11 is placed in the inner cavity of the upper part of the guide funnel 4 below the landing seat 10, it is pressed with the bottom of the guide funnel and the upper and lower parts are fastened with bolts 12.

On the shank 7 of the housing 5 before attaching to it a guide funnel 4 from the bottom, insert a spring centralizer 3.

Then they screw on the shank 7 guide funnel 4 in assembled form with a bursting disc 11 installed therein, pressing the spring centralizer 3 to the collet-fitting device 2.

The assembled and mounted device on SPGT 1 is lowered into the well under pressure to the design depth using a coiled tubing installation and a lifting mechanism (not shown) through ground coiled tubing equipment — an injector, a sealant, a preventer unit, and through wellhead equipment — an over-the-head valve, a suspension unit, a crosspiece , main valve (not shown).

The device operates as follows.

SPGT 1 is lowered into the well under pressure, the bottom of which is equipped with the inventive device in which the bore hole is blocked by the membrane 11 to the design depth. In this case, the saddle 10 of the inventive device remains free, that is, the ball (not shown) is not blocked. Overpressure is created at the wellhead by which the membrane 11 is ruptured, restoring the connection between the bottom hole and the wellhead.

The gas produced from the well is supplied via SPGT 1, which plays the role of CLK, through a torn membrane 11 at the wellhead and then sent to the consumer. The spring centralizer 3 provides the placement of SPGT 1 in the center of the well, allowing the flow of gas and the fluid and mechanical impurities carried with it to be carried out along the central axis of the well without abrasive wear of SPGT 1.

In the process of carrying out any repair work at the well, a ball (not shown) is thrown into the well from the wellhead, which sits in the saddle 10 of the guiding funnel 4, blocking the passage opening of SPGT 1 and, if necessary, jamming fluid is additionally pumped into SPGT 1. After completion of the repair work by creating increased depression on the reservoir, the ball is removed from the SPGT 1.

To extract SPGT 1 into it from the wellhead, a ball is similarly dropped, blocking the passage opening of SPGT 1, allowing it to be extracted under pressure.

In the case of the descent of deep devices into the well during their subsequent ascent, the placement of SPGT 1 in the center, along the axis of the well, together with the presence of a guiding funnel 4, allows the deflated depth device to easily enter the internal cavity of SPGT 1.

Thus, the claimed device improves the reliability and efficiency of the well.

The causal relationship of the claimed device between the essential features of the claimed technical solution and the technical result is that the combination of the device elements and their sequence will ensure the reliability and efficiency of the well with a large gap between the CLK and OLK (with diameters between 89 mm and 150 mm) without jamming it and without over-lifting, which will reduce material and technical costs.

Claims (1)

The bottom device of a steel-polymer sleeveless flexible pipe for operating a well without killing, consisting of a collet-fitting device, a spring centralizer and a funnel guide, sequentially placed on a steel-polymer sleeveless flexible pipe, while the collet-fitting device includes a housing with an insert fitting and a shank, a clamping ring and a union the nut, the guiding funnel with the landing saddle consists of two parts - the upper with the landing saddle and the lower, between which a bursting disc is located, the lower part of the guide funnel is spherical in shape and chamfers are made at the inlet, the upper and lower parts of the guide funnel are bolted together, while the guide funnel is screwed onto the shank of the collet fitting device, the spring centralizer is freely placed between the collet fitting device and the guide funnel , and the steel-polymer sleeveless flexible pipe is tightly mounted on the body fitting of the collet-fitting device and secured with a clamping ring and a union nut of the collet-fitting th device.

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