RU2530064C1 - Equipment disengagement method for downhole treatment with simultaneous disengagement of electric or hydraulic lines - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: the method includes usage of downhole disconnecting device consisting of the upper and lower parts of inserted into each other hermetically and fixed by locking members. At that the locking members are made as shear or elastic ring elements. Sealing is ensured by sealing elements. Disengagement of electric or hydraulic lines is made by a knife placed in one part of the downhole disconnecting device. The electric or hydraulic line is fixed by a clamp at the lower or upper parts of the disconnecting device. In the lower part there is a groove for placement of an electric or hydraulic line ended with a protrusion where disengagement takes place with maintenance of their fixing to the equipment and preventing accident and dangerous complications when a gland is formed of free hanging electric and hydraulic lines at the equipment lifting; or the protrusion is placed in the upper part of the disconnecting device.

EFFECT: improvement.

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Description

The invention relates to the oil and gas industry and can be used when conducting downhole operations in cases where it becomes necessary to disconnect one part of the equipment from another and disconnect electric or hydraulic lines while maintaining their attachment to the equipment.

Known downhole disconnector (analogue) [1], patent RU 2278945, IPC 8 E21B 17/06 publ. in bull. 18 dated June 27, 2006, including the upper and lower disconnectable parts connected by a lock unlocked by a movable sleeve that can be moved under the action of excessive pressure, the upper part of the disconnector being made in the form of an adapter, to which a lock made in the form of a collet is connected, fixed movable sleeve, having the ability to move under the action of excess pressure generated in the annulus, and connected to a piston placed in an annular cylindrical cavity, hydraulically connected with the inner cavity of the pipe string, the collet has a multifaceted groove and is connected to a sub having a connecting thread on top, the lower part of the disconnector is made in the form of a rod, the upper end of which has a multifaceted shape and is placed in the multifaceted groove of the collet, and its lower end has a connecting thread .

The disadvantages of this device are: firstly, for the device to act (disconnect) in the well, it is necessary to create a pressure drop in the annular and column spaces, while the pressure drop must be sufficient to move the piston up. To fulfill this condition, it is necessary to strictly comply with the design dimensions of the device, tied directly to the size of the production casing of the well into which this well disconnector is lowered, and secondly, low reliability, since the hole in the sub can become clogged with sludge, dirt, paraffin and others, this is especially true for wells with a long service life, which ultimately leads to the failure of the device in operation.

Known isolation adapter (analog) [2], patent RU 2271431, IPC 8 E21B 17/06, publ. in bull. 7 dated 10.03.2006, including a composite housing consisting of upper and lower parts, between which there is a sealing assembly located above the torque transmission assembly, connecting the housing parts to each other and made in the form of a splined connection, and a saddle for the throttle valve, moreover, the device is equipped with an axial load transmission unit in the form of a collet with protrusions on the outer surface of the spring petals, while the continuous end of the collet is connected to the upper part of the housing, and the protrusions of the collet are placed in an annular bore, made th on the inner surface of the lower part of the housing, and fixed in position by a saddle under the throttle valve, fixed in turn by a compression spring mounted on a retaining ring rigidly connected to the lower part of the housing, and the split part of the collet is made with an inner conical surface, and the saddle under dump valve - with a mating outer surface. The disadvantages of this device are: firstly, the complexity of the design of the device associated with a large number of nodes and parts (slots, collets); secondly, the low reliability of the device, since it is possible unauthorized operation of the device due to compression of the spring during sharp tripping operations. In addition, a leaky fit of the waste valve on the seat is possible, which can become clogged with sludge, dirt, paraffin and others, especially for wells with a long service life, which ultimately leads to the failure of the device in operation.

Known downhole disconnector (prototype) [3], patent RU 2444607 C1 IPC E21B 17/06 2006.01, application 2010137051/03, filing date 03.09.2010. The invention relates to the oil and gas industry and can be used when conducting downhole operations, if necessary, the separation of one part of the equipment from another. The device includes upper and lower disconnectable parts connected by a lock to a gripping collet unlocked by a movable sleeve when moving under excessive pressure. The upper end of the lower part is provided with an annular groove under the collet. Its lower end has a connecting thread. The movable sleeve is hermetically placed inside the sub, fixed in its original position by a shear screw and equipped with a seat for seating the ball discharged from the wellhead. In the initial position, the tabs of the collet are internally pressed against the groove of the lower part of the disconnector by a cylindrical selection on the surface of the sub. The lock is made in the form of a ball retainer inserted into the through holes in the sub. In the initial position, the ball retainers are externally pressed by the inner annular groove of the collet, and from the inside by a movable sleeve, which has the ability in the working position of limited axial downward movement with the subsequent drop out of the ball retainers in a cylindrical groove on the outer surface of the sleeve and axial downward movement of the sub relative to the collet with the possibility of output of the collet protrusions from interaction with the outer cylindrical sub sample and from the annular groove of the lower part of the disconnector. The movable sleeve above the ball seat is equipped with radial channels.

The disadvantages of this device are the impossibility of conducting downhole operations when disconnecting equipment while disconnecting electrical or hydraulic lines while maintaining their attachment to the equipment.

The objective of the invention is the separation of equipment during downhole operations with the possibility of simultaneous separation of electric or hydraulic lines and maintaining their attachment to the upper and lower parts of the disconnected equipment, preventing emergency-hazardous complications in the formation of an oil seal from freely hanging electrical and hydraulic lines when lifting equipment, as well as increased reliability due to guaranteed operation of the device.

The essence of the method is to disconnect the electric or hydraulic lines with a knife when disconnecting the upper and lower parts.

The problem is solved by a borehole disconnector, including the upper and lower parts, hermetically inserted into each other and fixed by locking elements. In this case, the locking elements are in the form of shear elements or elastic ring elements located in the groove, and the sealing is provided by sealing elements. Separation of electric or hydraulic lines is carried out using a knife located on one of the parts of the borehole disconnector, when the upper and lower parts are disconnected, while the electric or hydraulic line is fixed with a clamp on the lower part or on the upper and lower parts of the borehole disconnector. At the same time, a groove is provided in the lower part for laying an electric or hydraulic line, ending with a protrusion, on which the electric or hydraulic line is disconnected while maintaining their fastening to the upper and lower parts of the disconnected equipment and the prevention of emergency-hazardous complications during the formation of an oil seal from freely hanging electrical and hydraulic lines when lifting equipment, or the protrusion is located on the upper part of the borehole disconnector.

Figure 1 in longitudinal section shows the design of one of the variants of the borehole disconnector, explaining the method of separation of equipment during downhole operations while simultaneously disconnecting the electric or hydraulic line while maintaining their attachment to the equipment.

The design consists of a lower case 1 with a clamp 3 for an electric or hydraulic line 9, an upper case 2 with covers 5 and 6, a knife 4, sealing elements 7 and shear elements 8. The covers, knife and cable clamp are fastened with bolts. When the equipment is disconnected, the shear elements 8 are cut and the upper case 2 moves up. At the same time, the cover 6 moves with the knife 4 and the electric or hydraulic line 9 is disconnected, fixed to the lower 1 or lower 1 and upper 2 housing.

What is new is that the electric or hydraulic line is secured by a clamp on the lower part or can be fixed on the lower and upper parts of the borehole disconnector. Separation of electric or hydraulic lines is carried out using a knife when disconnecting the upper and lower parts. At the same time, a groove is provided in the lower part for laying an electric or hydraulic line, ending with a protrusion, on which the electric or hydraulic line is disconnected while maintaining their fastening to the upper and lower parts of the disconnected equipment and the prevention of emergency-hazardous complications during the formation of an oil seal from freely hanging electrical and hydraulic lines when lifting equipment, or the protrusion is located on the upper part of the borehole disconnector.

Technological and technical results when using the method are achieved by accelerating the separation of one part of the equipment from the other during downhole operations and the disconnection of the electric or hydraulic line while maintaining their attachment to the equipment, which eliminates the twisting of the line around the tubing and the formation of an emergency hazardous gland.

The economic effect of the use of the invention can be achieved due to the absence of the need for fishing operations of an electric or hydraulic line in the event of sticking of pumping equipment in the well due to the preservation of their attachment to the equipment and to reduce the risks of breakage of tubing due to reduced load due to cutting off the electric or electric and hydraulic lines.

References

1. Patent RU 2278945, IPC 8 E21B 17/06 publ. in bull. June 18, 2006

2. Patent RU 2271431, IPC 8 E21B 17/06, publ. in bull. March 7, 2006

3. Patent RU 2439281 C1, IPC E21B 17/06 (2006.01) Application: 2010129892/03. Application submission date: 07/16/2010.

Claims (1)

1. The method of separation of equipment during downhole operations with the simultaneous separation of electric or hydraulic lines, characterized in that the borehole disconnector includes upper and lower parts, hermetically inserted into each other and fixed by locking elements, while the locking elements are made in the form of shear elements or in the form of elastic ring elements located in the groove, and the sealing is provided by sealing elements, the separation of electrical or hydraulic they are carried out using a knife located on one of the parts of the borehole disconnector, when the upper and lower parts are disconnected, while the electric or hydraulic line is fixed by pressing on the lower part or can be fixed on the upper and lower parts of the borehole disconnector, and the lower part is provided a groove for laying an electric or hydraulic line, ending with a protrusion, on which separation occurs while maintaining their fastening to the equipment and preventing accident-hazardous complications in the formation of an oil seal from freely hanging electrical and hydraulic lines when lifting equipment, or a protrusion is located on the upper part of the borehole disconnector.

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