CN113123728A - Sleeve, sleeve assembly and assembling method thereof - Google Patents

Abstract

The invention provides a sleeve, a sleeve assembly and an assembling method thereof, wherein the sleeve comprises: a ball cup seat; the first end of the pipe body is rotatably connected with the ball head seat; the first end of a flexible cylinder is connected with the second end of the pipe body. The technical scheme of this application has solved the sleeve pipe atress among the relevant art effectively and has leaded to the sleeve to warp the problem that the internal diameter reduces and even damage.

Description

Sleeve, sleeve assembly and assembling method thereof

Technical Field

The invention relates to the field of petroleum and natural gas well completion development, in particular to a sleeve, a sleeve assembly and an assembling method thereof.

Background

Casing deformation damage accidents often occur in the shale gas exploitation process, so that the single-well yield of the shale gas production well is reduced, and even the well is abandoned. The casing deformation controller can control the deformation of the casing and is one of key devices for ensuring the stability and safe yield increase of the shale gas.

Shale gas exploitation mainly uses a staged fracturing technology of a horizontal well, and the horizontal well needs to be drilled in a shale gas reservoir. Due to the characteristics of large length of the horizontal well and complex geological structure of the shale gas reservoir, a shaft of the shale gas horizontal well often passes through natural cracks and faults. In pursuit of high yield, shale gas development mostly adopts large-displacement volume fracturing to reform underground reservoirs in a large scale, so that natural fractures and fractures in the stratum are induced to slide. When stratum is subjected to sliding deformation, the stratum which is mutually dislocated can shear the casing, and the deformed inner diameter of the casing is reduced and even damaged. Casing deformation damage prevents downhole tools from running in, thereby reducing or even stopping production from shale gas wells.

Disclosure of Invention

The invention mainly aims to provide a sleeve, a sleeve assembly and an assembling method thereof, which are used for solving the problem that the deformation inner diameter of a sleeve is reduced and even damaged due to the stress of the sleeve in the related art.

In order to achieve the above object, according to one aspect of the present invention, there is provided a bushing comprising: a ball cup seat; the first end of the pipe body is rotatably connected with the ball head seat; the first end of a flexible cylinder is connected with the second end of the pipe body.

Furthermore, the ball head seat and the pipe body are nested, one of the ball head seat and the pipe body is provided with a spherical groove, and the other is provided with a ball head accommodated in the spherical groove.

Furthermore, the first end of the pipe body is connected with the first end of the ball head seat, and the first end of the ball head seat is provided with an expanding section.

Further, the sleeve pipe still includes the supporting part, and the supporting part includes a plurality of arc spring pieces that arrange along the circumference of body, and the first end and the body of arc spring piece are connected, and the second end of supporting part passes through fastener or plug connector or joint spare and body fixed connection.

Further, the second end of the supporting part is fixedly connected with the pipe body through a fastener, and the fastener is a pin.

Furthermore, the sleeve further comprises a connecting piece and a joint, the connecting piece comprises a spherical hinge clamping ring, the connecting piece is installed at the first end of the joint, and the first end of the joint is connected with the second end of the ball head seat through the connecting piece.

Furthermore, the material of a flexible section of thick bamboo is nitrile rubber, and the first end of a flexible section of thick bamboo is connected with the body through first helicitic texture or first joint structure.

Further, the sleeve pipe still includes the connecting tube body, and the first end of connecting tube body and the second end of a flexible section of thick bamboo pass through second helicitic texture or second joint structural connection, and the second end of connecting tube body is provided with third helicitic texture or third joint structure.

Further, the second end of the joint is provided with a fourth thread structure or a fourth clamping structure.

According to another aspect of the present invention, there is provided a ferrule assembly comprising a plurality of interconnected ferrules, the ferrules being as described above.

According to another aspect of the present invention, there is provided a method of assembling a plurality of tube assemblies, the method comprising the steps of:

installing a supporting part: welding one end of a supporting part on the pipe body, and fixing the other end of the supporting part on the pipe body through a fastening piece;

assembling a joint end: sleeving the ball cup from the threaded end of the pipe body, connecting the ball cup with a joint through a connecting piece to form a joint end, and connecting the ball cup with the joint;

installing a flexible cylinder: connecting the flexible tube with the tube body and the connecting tube body through a thread structure to form a sleeve;

installing a plurality of sleeve assemblies in series: sequentially connecting a plurality of sleeves end to form a sleeve assembly;

installing a sleeve component: the sleeve assembly is positioned at a natural fracture or fault location.

By applying the technical scheme of the invention, the first end of the pipe body is connected with the ball head seat, the pipe body can rotate relative to the ball head seat, and the first end of the flexible cylinder is connected with the second end of the pipe body. The rotation of body can make the sleeve pipe have more forms, makes the change of sleeve pipe adaptation stratum that can be better. The flexible piece is extendible, and the flexible piece cooperation body can make the sheathed tube connect more stably and to stratum change adaptability stronger, can prevent to cause the destruction because of the shearing force that the stratum change produced to the sleeve pipe. In the technical scheme of this application, when the stratum changes, exert shearing force, tensile force or compressive force to the sleeve pipe, because the body is rotatable, consequently, the body can be according to the change of stratum, and the sleeve pipe can rotate in order to adapt to the change of stratum automatically. Moreover, because the flexible cylinder can stretch and contract, when the sleeve faces tensile force, the sleeve can adaptively elongate the length of the flexible cylinder so as to deal with the change of the stratum. Therefore, the technical scheme of the application effectively solves the problem that the deformation inner diameter of the sleeve is reduced or even damaged due to the stress of the sleeve in the related technology.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a schematic cross-sectional view of an embodiment of a bushing according to the invention;

FIG. 2a shows a partial mating cross-sectional view of the bushing shown in FIG. 1;

FIG. 2b shows a cross-sectional view of the sleeve of FIG. 2a after deformation;

FIGS. 3a and 3b show schematic diagrams comparing before and after a force is applied to the support portion of the cannula shown in FIG. 1;

FIG. 4 is a schematic diagram showing a comparison of the flexible barrel of the cannula of FIG. 1 before and after being stressed;

FIG. 5 is a schematic view illustrating the overall stress of the casing shown in FIG. 1;

fig. 6a shows a connection schematic of an embodiment of a ferrule assembly according to the present invention; and

fig. 6b shows a schematic view of the use of the sleeve assembly of fig. 6 a.

Wherein the figures include the following reference numerals:

1. a joint; 2. a connecting member; 3. a ball cup seat; 4. a pipe body; 5. a fastener; 7. a support portion; 8. a flexible barrel; 9. connecting the pipe body; 10. a sleeve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

As shown in fig. 1, in the present embodiment, the ferrule of the present embodiment includes: a ball cup 3, a tube 4 and a flexible tube 8. The first end of the tube body 4 is rotatably connected with the ball head seat 3; a first end of the flexible cartridge 8 is connected to a second end of the tubular body 4.

Use the technical scheme of this embodiment, the first end and the bulb seat 3 of body 4 are connected, and body 4 can rotate relative bulb seat 3, and the first end and the 4 second end of body of flexible section of thick bamboo 8 are connected. The rotation of body 4 can make the sleeve pipe have more forms, makes the sleeve pipe can better adapt to the change of stratum. The flexible tube 8 is telescopic, and the flexible tube 8 cooperates body 4, can make sheathed tube connection more stable and stronger to stratum change's adaptability, can prevent that the shearing force that produces because of the stratum change from causing the destruction to the sleeve pipe. In the technical scheme of this embodiment, when the stratum changes, shear force, tensile force or compressive force are exerted to the sleeve pipe, because body 4 is rotatable, consequently, body 4 can be according to the change of stratum, and the sleeve pipe can rotate in order to adapt to the change of stratum automatically. Moreover, since the flexible tube 8 can be changed in a telescopic manner, when the casing is faced with a tensile force, the casing can adaptively elongate the length of the flexible tube 8 to cope with changes in the formation. And the structure is simple, safe and reliable. Therefore, the technical scheme of the application effectively solves the problem that the deformation inner diameter of the sleeve is reduced or even damaged due to the stress of the sleeve in the related technology.

As shown in fig. 2a and 2b, in the present embodiment, the ball seat 3 is nested with the tube 4, the ball seat 3 is provided with a spherical recess, and the tube 4 is provided with a ball head accommodated in the spherical recess. The connection between the ball socket 3 and the pipe body 4 is more stable through the nesting arrangement, the pipe body 4 can be effectively prevented from being separated from the inside of the ball socket 3, and the pipe body 4 can rotate more stably on the ball socket 3 through the cooperation of the ball head and the spherical groove. The maximum inclination angle of the pipe 4 is 15 degrees, and it should be noted that the included angle between the axis of the pipe 4 when the pipe is maximally inclined and the axis of the pipe 4 when the pipe is horizontal is the maximum inclination angle of the pipe 4.

As shown in fig. 2a and 2b, in the present embodiment, the first end of the tube 4 is connected to the first end of the ball cup 3, and the first end of the ball cup 3 is provided with a flaring segment. The flaring section is arranged to effectively prevent the pipe body 4 from interfering with the ball socket 3 when rotating, so that the rotating angle of the pipe body 4 in the ball socket 3 is larger.

As shown in fig. 1, 3a and 3b, in the present embodiment, the sleeve further includes a support portion 7, the support portion 7 includes four arc-shaped spring pieces (only two arc-shaped spring pieces are shown in fig. 1, 3a and 3 b) arranged along the circumferential direction of the pipe body 4, a first end of the arc-shaped spring pieces is connected with the pipe body 4, and a second end of the support portion 7 is fixedly connected with the pipe body 4 by a fastener 5. Arc spring leaf is four, and the interval sets up in the week of body 4, and supporting part 7 plays cushioning effect, and when body 4 received the extrusion, body 4 can be protected to supporting part 7, prevents that body 4 atress is too big, leads to body 4 to damage. When the casing is arranged in the stratum, the well section in the horizontal well, where the casing is installed, is cemented by adopting a flexible filling agent, the supporting part 7 plays a role in centralizing, and the well section in the horizontal well, where the casing is not used, is cemented by adopting cement. When a natural crack or a fault slides, the sleeves on the two sides of the sliding surface dislocate, the flexible cylinder 8 is bent and elongated in a self-adaptive mode, and the concentrated deformation of the shearing and dislocating of the sliding surface is dispersed, so that the shearing deformation of the sleeves is prevented. The flexible filler can enable the sleeve deformation controller to freely deform under the control of a ring and is not constrained by rigidity.

As shown in fig. 3a and 3b, in this embodiment, the fastening member 5 is a pin, which has a simple structure and is easy to install, the pin is squeezed by the formation at the support portion 7 and is sheared when the squeezing force exceeds a certain value, and the support portion 7 slides outwards, so that the sleeve assembly with the failed support portion 7 is adapted to reduce the inner diameter of the wellbore.

As shown in fig. 2a and 2b, in this embodiment, the sleeve further includes a connector 2 and a joint 1, the connector 2 includes a ball-hinged snap ring, the connector 2 is installed at a first end of the joint 1, and the connector 2 connects the first end of the joint 1 with a second end of the ball seat 3. The ball pivot snap ring is arranged between the joint 1 and the ball cup 3, the joint 1 and the ball cup 3 are preliminarily fixed, the joint 1 and the ball cup 3 are finally fixed in a welding mode after the fixation, and the joint 1 and the ball cup 3 can be sealed through the welding.

As shown in fig. 4, in this embodiment, the flexible tube 8 is made of nitrile rubber, and the first end of the flexible tube 8 is connected to the pipe body 4 through a first thread structure or a first clamping structure. The nitrile rubber has excellent oil resistance, wear resistance and heat resistance, can realize the sealing connection of the fracturing fluid without leakage, can resist the internal pressure of the fracturing fluid without excessive expansion and deformation during fracturing construction, and can be properly stretched to adapt to stratum deformation.

As shown in fig. 1 and 4, in this embodiment, the sleeve further includes a connection tube body 9, a first end of the connection tube body 9 is connected to a second end of the flexible tube 8 through a second thread structure, and a second end of the connection tube body 9 is provided with a third thread structure. The threaded structure is simple in connection and high in efficiency.

In an embodiment not shown in the drawings, the first end of the connecting pipe body and the second end of the flexible member can also be connected by a clamping structure, and the effect is similar to that of connection by a threaded structure.

As shown in fig. 1 and 4, in the present embodiment, it is characterized in that the second end of the joint 1 is provided with a fourth thread structure. Fourth helicitic texture can be connected with the third helicitic texture that the second end of connecting tube body 9 set up here, and the excellent in connection effect.

As shown in fig. 5, 6a and 6b, the present application also provides a cannula assembly comprising a plurality of interconnected cannulas 10, the cannula 10 being the cannula 10 described above. The sleeve 10 is sequentially connected with the head to form a sleeve assembly, and the sleeve assembly can be effectively adjusted for stratum changes, so that the pipe body can be effectively prevented from being damaged by stress. The casing assembly is formed by connecting a plurality of casings in series, is arranged at a natural crack or fault position of a shale gas horizontal well section, is directly connected with the horizontal well section casing, and can superpose the bending amount and the elongation amount of the casing as a part of the whole casing, so that the casing assembly is suitable for stratum change of a large degree.

The assembly steps of the tube assembly of this embodiment are as follows:

installing a supporting part: one end of the supporting part 7 is directly welded on the pipe body 4, and the other end is connected and fixed on the pipe body 4 through the fastening part 5;

assembling a joint end: sleeving the ball cup 3 from the threaded end of the pipe body 4, connecting the ball cup with the joint 1 through the connecting piece 2 to form a complete joint end, and finally connecting the ball cup 3 with the joint 1 through the connecting piece 2 and connecting the ball cup and the joint together through a welding process;

installing a flexible cylinder: the flexible cylinder 8 is connected with the pipe body 4 and the connecting pipe body 9 through a thread structure;

connecting a plurality of installation sleeve assemblies in series: after the sleeve assembly is finished, sequentially connecting a plurality of sleeves end to end through a thread structure to form a sleeve assembly;

installing a sleeve component: positioning the sleeve assembly right at the natural fracture or fault location;

cementing wells: the horizontal well is cemented by cement, when the cement is poured to the position of the sleeve assembly, the cement pouring is stopped, the flexible filler is used for cementing the well, and when the sleeve assembly is cemented, the other parts continue to be cemented by the cement;

the sleeve assembly works: when the stratum is slipped and dislocated, the sleeve pipe assembly is bent and elongated, the self-adaptive stratum deforms, when the inner diameter of the shaft is reduced, the supporting part 7 fails, and the sleeve pipe assembly self-adapts to the stratum and the shaft, so that the centralized deformation is dispersed, and the purpose of controlling the sleeve deformation is achieved.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. A bushing, comprising:

a ball cup (3);

the first end of the pipe body (4) is rotatably connected to the ball socket (3);

a flexible tube (8), a first end of the flexible tube (8) being connected to a second end of the tube body (4).

2. The bushing of claim 1, wherein the ball socket (3) and the tube (4) are nested, and one of the ball socket (3) and the tube (4) is provided with a spherical groove, and the other is provided with a ball head accommodated in the spherical groove.

3. A sleeve according to claim 1, characterized in that the first end of the tube (4) is connected to the first end of the ball cup (3), the first end of the ball cup (3) being provided with a flared section.

4. The bushing of claim 1, further comprising a support portion (7), wherein the support portion (7) comprises a plurality of arc-shaped spring pieces arranged along a circumferential direction of the pipe body (4), a first end of the arc-shaped spring pieces is connected with the pipe body (4), and a second end of the support portion (7) is fixedly connected with the pipe body (4) through a fastener (5) or a plug-in connector or a snap-in connector.

5. Bushing according to claim 4, wherein the second end of the support (7) is fixedly connected to the tubular body (4) by means of the fastening element (5), the fastening element (5) being a pin.

6. The bushing of claim 1, further comprising a connector (2) and a joint (1), the connector (2) comprising a ball-and-socket snap ring, the connector (2) being mounted to a first end of the joint (1), the connector (2) connecting the first end of the joint (1) with a second end of the ball socket (3).

7. The bushing of claim 1, wherein the flexible sleeve (8) is made of nitrile rubber, and the first end of the flexible sleeve (8) is connected to the pipe body (4) through a first thread structure or a first clamping structure.

8. The cannula according to claim 1, further comprising a connecting tube body (9), wherein a first end of the connecting tube body (9) is connected with a second end of the flexible tube (8) through a second thread structure or a second snap structure, and a second end of the connecting tube body (9) is provided with a third thread structure or a third snap structure.

9. Sleeve as claimed in claim 6, characterized in that the second end of the joint (1) is provided with a fourth thread structure or a fourth snap structure.

10. A cannula assembly comprising a plurality of interconnected cannulas (10), characterized in that the cannula (10) is a cannula (10) according to any of claims 1 to 9.

11. A method of assembling a ferrule assembly, comprising assembling a plurality of ferrule assemblies, the method comprising the steps of:

installing a supporting part: welding one end of a supporting part on the pipe body, and fixing the other end of the supporting part on the pipe body through a fastening piece;

assembling a joint end: sleeving the ball cup from the threaded end of the pipe body, connecting the ball cup with a joint through a connecting piece to form a joint end, and connecting the ball cup with the joint;

installing a flexible cylinder: connecting the flexible tube with the tube body and the connecting tube body through a thread structure to form a sleeve;

installing a plurality of sleeve assemblies in series: sequentially connecting a plurality of sleeves end to form a sleeve assembly;

installing a sleeve component: the sleeve assembly is positioned at a natural fracture or fault location.

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