JP2535046B2 - Well structure, well member fixing method, and forming tool - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a well structure, a well member fixing method, and a forming tool, and more particularly to fixing a tubular member such as a well string to a housing in an annular well member such as a well hole. how to,
The present invention relates to a well structure produced thereby and a forming tool therefor.

<Prior Art> A hanger is known in which a hanger is seated in a housing in a well and engaged with the string to provide a seat for the string. Hangers are known that slide to engage and support a well string. U.S. Patent No. 2,920,
See Nos. 909 and 3,311,168.

Another type of hanger has an outer shoulder and is suitable for seating in an inner housing seat, U.S. Pat. Nos. 3,561,527, 3,797,8
No. 64, etc.

These hangers usually have an outer thread at the lower end into which a well string is threaded. Traditionally, a portion of the remote fitting is remotely cold-formed at the end of the subsea pipeline to repair the existing pipeline. It is known to connect to. Cold forming is US Pat.
432,916, 4,330,144, 4,388,752. U.S. Pat. No. 4,662,663 suggests placing material on the premises to compensate for pressure buildup during molding.

<Means for Solving the Problems> The present invention relates to a novel well structure and a method for connecting a support ring to a well string in a well hole, the support ring being in a well surrounding the well string and in a housing seat. And the pressure forming tool down to the level of the support ring through the well string and pressurizing the tool so that the well string tightly grips and seals with the inside of the support ring and the resulting bond is formed. A method is provided that includes the steps of testing and collecting the tool. The tool has means for amplifying the pressure used in the forming tool,
There is no need for the molding pressure to act on the entire length of the string. The support ring has an outer shoulder that engages a seat in the housing, a sealing shaped portion that includes a plurality of inner grooves, the grooves partially filled with pressure compensating material, and a grip shaped portion having a plurality of gripping teeth. including. The well structure according to the invention comprises a support ring and a second element comprising a tubular portion, which is deformed into a tight grip, sealing engagement with the interior of the support ring.

<Operation> According to the present invention, a novel method of fixing the well string to the support ring in the well hole can be obtained.

The present invention provides a novel well hanger that is easily and securely fixed to a well string in a well hole.

Further in accordance with the present invention, a novel remote controlled forming tool is provided for securing the well string to the surrounding support ring.

Furthermore, the invention provides a novel method of connecting two annular members to each other in a well hole.

<Examples> The objects, functions and effects of the present invention will be apparent from the following description with reference to the drawings.

In FIG. 1, the well bore 10 is provided with a cemented well head housing 12 and a bell nip 14 extending upwardly from the housing 12 for returning the return from the annulus to the return line 16. Turntable in rig floor 26
The casing string 18 is supported by slips 20 in a bowl 22 supported by 24. The string 18 is then clamped and cut above the slip 20. The seat ring 28 is located above the slip 20 in a relationship surrounding the string 18. The string 18 is tensioned off using a derrick (not shown), the slip 20 is removed, and the seat ring 28 is lowered to seat on the landing shoulder 32 of the landing seat 30 in the wellhead housing 12. After the seat ring 28 is seated, the string 18 is re-tensioned and the slip 20 is reattached (see FIG. 2). In some cases it may be desirable to provide a blowout prevention stack between the top of the wellhead housing 12 and the bottom of the bell nipple 14 to control pressure build up during blowout.

The portion of the casing string 18 above the slip 20 is cut and the forming tool 34 is lowered by a drill string 36 through the interior of the casing string 18.
It is located just inside the seat ring 28 and inside the casing string 18. This position of the forming tool 34 is the third
Shown in Figures and FIG. The string 36 is suspended by a line 38 and the fluid line 40 is connected via a joint 42.

As shown in FIG. 4, the seat ring 28 includes a central body 44 having a landing shoulder 30 on the lower outer surface and a lower tubular extension 46.
And an upper tubular extension 48. An annular cavity 50 having an inner groove 52 with a sharp protrusion 54 in the lower tubular extension 46.
And the groove 52 is formed by threading or other suitable machining. Formed inside the central body 44 are a plurality of grooves 56 that are at least partially filled with a pressure compensation material 57, such as microspheres suspended in an epoxy matrix. The inner diameter of the seat ring 28 is the casing string
Sufficiently larger than the outer diameter of 18 to allow the ring 28 to descend to the aforementioned position. The landing shoulder 32 is preferably not formed integrally with the seat ring 28 but formed on another landing ring 30 '. A soft metal seal ring 33 is mounted on the lower outer surface of the seat ring 28 as shown in FIG.
It seals the annular space between the outer diameter of the seat ring 28 and the inner diameter of the wellhead housing 12.

The forming tool 34 comprises a tubular body 58, the lower end of which is closed and an annular recess 60 in which an elastic annular packing 62 is arranged.
Is provided. A suitable fluid 66 is filled in a hole 64 formed inside the annular body 58 inside the packing 62.
The fluid fill is through hole 68, which is closed by a threaded plug 70. A piston 72 is located within the forming tool 34 and its lower end 74 is surrounded by a seal 76 at the upper end of the hole 64. The upper end 78 of the piston 72 is substantially larger in diameter than the lower end 74 and is located within the counterbore 82 and is surrounded by a seal 80. A ring 84 is screwed onto the upper end of the forming tool 34 and forms a stopper for the upper limit of movement of the piston 72. The ring 84 has an upper inner thread to which the string 36 is connected to support the tool 34 and provide a conduit for delivering pressurized fluid.

With the forming tool 34 in the position shown in FIG. 4, pressure fluid is directed through conduit 40, fitting 42, and string 36 to the upper end of counterbore 82 to exert pressure on the upper end of piston 72. Since the area of the upper end of the piston 72 is substantially larger than the area of the lower end, the hole 64
A pressure is created therein that is substantially greater than the pressure delivered through conduit 40. In this way the piston 72 is a string
It acts as an amplifier for the fluid pressure supplied to the tool 34 via 36. The pressure in the hole 64 passes through the body 58 and communicates with the interior of the recess and the elastic, elastic, annular packing 62.
Transmitted via 86. Sufficient fluid pressure is generated inside the packing 62 so that the packing 62 expands radially outwardly toward the inside of the casing 18 and sufficient force is generated to force the casing 18 into the groove and annular cavity 50. The protrusions 54 are pushed in tightly and engaged with each other to form the sharp protrusions 54 between the inner grooves 56. casing
The casing 18 is fixed in the seat ring 28 by the engagement between the casing 18 and the annular space 50, and the casing 18 is sealed from the outside of the casing 18 by the engagement in the inner groove 52 of the casing 18. A port 88 that extends through the body 58 from the lower portion of the counterbore 82 to the outside of the body 58 during movement of the piston 72.
Releases the fluid inside the counterbore 82 and prevents the fluid lock of the piston 72. Seat ring 28, seat ring 28
Includes an internally threaded test port 29 that intersects a radial port 31 extending from the outer diameter to the inner diameter. The recessed pipe plug 33 ′ closes the port 31 at the outer diameter of the seat ring 28. The seat ring 28 further includes an inner O-ring seal in a groove 37 directly above the port 31 located above the groove 56.
35 are provided. Test pressure is introduced through port 29, port 31 into the annular cavity between groove 56 and below O-ring seal 35 to test the seal between casing 18 and groove 56 to ensure sufficient The forming tool 34 is removed after testing for forming force.

The use of pressure compensating material 57 in the inner groove 52 allows molding of the casing even when the entire structure is in a liquid environment, such as a subsea position, with the environmental liquid being a fluid lock or obstacle for molding the casing 18. Prevent that. FIG. 5 shows a completed state of molding (deformation) of the casing 18,
The tool 34 is still in the molding position in the casing. In FIG. 6, the molding is completed, the tool 34 is removed from the inside of the casing, and the casing 18 is deformed to grasp and engage with the inside of the seat ring 28.

A variation of the device of the present invention is shown in FIG.
Is deformed by the method of the present invention for tight grip and sealing engagement with hanger 92, which is seated within well housing 94. A spool 96 is landing on the housing 94 above the hanger 92.

Another variation of the device of the present invention is shown in FIG. 8 where the well housing 98 has a damaged upper inner shoulder 100. The repair housing 102 has a desired inner, outer and upper shape and includes an inner rim 104 extending downwardly within the housing 98 and an outer rim 106 extending downwardly outside the housing 98. The inner rim 104 is deformed by the method of the present invention to provide a tight grip and sealing engagement with the inside of the housing 98.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a well hole, showing a well string supported by a rotary table and a support ring surrounding the well string above the rotary table, and FIG. 2 is another schematic sectional view of the well hole. FIG. 3 is a view showing the support ring landing on the housing seat, FIG. 3 is another schematic sectional view of the well hole, and FIG. 3 is a view showing the forming tool at the height position of the support ring in the well string, and FIG. FIG. 5 is a partially detailed sectional view of the support ring, the well string and the forming tool before the forming step, and FIG. 5 is a partially detailed sectional view similar to FIG. FIG. 6 is a schematic cross-sectional view of a well hole showing a state in which a well string is fixed to a support ring and a forming tool is removed, and FIG. 7 is a view showing a support ring having a well string formed according to the present invention. Shows a modified example Detailed sectional view, FIG. 8 is a detailed cross-sectional view showing a modification of the well structure according to the invention for repairing damaged wells member. 10: Well hole, 12: Well head housing 14: Bell nipple, 16: Return line 18: Casing string, 20: Slip 22: Bowl, 24: Rotating table 28: Seat ring, 29: Test port 30: Standing seat , 32: Landing shoulder 34: Forming tool, 36: String 40: Fluid line, 44: Central body 57: Pressure compensation material, 58: Cylindrical body 64: Hole, 72: Piston 82: Counterbore hole

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Steven Dee Gallion, Meadow Lake, Houston 77077, Texas 77077, USA 12443

Claims (12)

(57) [Claims] 1. A seat ring is lowered into a landing seat of a well housing in a relationship surrounding a well string to support a well string above a well housing, the seating ring having already seated and the well ring being supported. The forming tool is lowered into the well string, and the fluid pressure is sent through the well string to the inside of the forming tool, and the fluid pressure is high enough to apply the well string to the seat ring to deform it and seal support engagement with the seat ring. A method for fixing a seat ring to a well string, which comprises a step of increasing a fluid pressure sent to the inside of a forming tool until the above. 2. A well head housing, a seat ring supported by the well head housing, a seal between the well head housing and the seat ring, and extending to the seat ring to be deformed and firmly gripped by the seat ring. A well structure consisting of a well casing string sealingly engaged therewith. 3. The well structure according to claim 2, wherein the well casing string is already fixed to the well hole before its deformation. 4. The well structure according to claim 2, wherein the seat ring has a sandwiching contour and a sealing contour on its inner surface. 5. The well structure of claim 4 wherein the clamping contour has a recess with a plurality of clamping teeth and the sealing contour has a plurality of spaced apart annular grooves. 6. The well structure of claim 5 wherein the pressure compensating material is within the annular groove of the sealing contour. 7. A test means is provided for pressure testing the engagement of the sandwich seal of the well casing string with the seat ring, the test means for sandwiching the well casing string and seat ring from the space above the seat ring. The well structure according to claim 2, wherein a test port is provided in the seat ring connected to the inside of the seat ring in the sealing engagement. 8. A support ring having an outer seating shoulder for engaging a well housing having an inner seating portion with a well casing string to engage the seating shoulder with the well housing, and an inner sealing profile. The well structure has an annular recess with a plurality of clamping teeth on the gripping contour and a plurality of spaced apart annular grooves on the sealing contour. 9. A well structure according to claim 8 comprising a pressure compensating material at least partially filling the annular groove. 10. The well structure according to claim 9, wherein the pressure compensation material is a microsphere as an epoxy matrix. 11. A body having a closed lower end, an outer annular recess with a hole on the closed lower end, a counterbore hole above the hole, a piston in the hole and the counterbore hole, and an outer annular ring. An elastic annular sleep in the recess and a port between the lower end of the hole and the inside of the outer annular recess and through the body,
A well tool for fixing a tubular member, comprising a hole between a closed end and a lower end of a piston among the holes, and a hydraulic fluid filling a port, wherein the counterbore hole is made larger than the hole. When pressure is applied to the top of the counterbore, the piston is pushed downwards, creating a large pressure in the outer tubular recess inside the bore, port, and sleeve, and clamping it in the tubular well member. A tubular member securing well tool adapted to push an annular sleep member outwardly with sufficient force to deform the tubular member for sealing engagement, thereby securing the tubular member to the annular well member. 12. An inner surface of a damaged well housing mounted around and within the damaged well housing and concentric with an outer tube rim extending below and around the exterior of the damaged well housing. A well structure comprising a repairing well housing with an inner rim extending below and into the inner rim, the inner rim having a gripping contour and a sealing contour on its outer surface, whereby A well structure in which a rim hits a damaged well housing and is deformed to be in a nipping and sealing engagement state.