CN218716599U

CN218716599U - Anti-abrasion set screw connector for continuous oil pipe

Info

Publication number: CN218716599U
Application number: CN202222817644.2U
Authority: CN
Inventors: 钟康; 朱园园; 卢超; 史海涛; 王国栋; 邱迅; 张海建; 黄国昌
Original assignee: Sinopec Oilfield Service Corp; Sinopec North China Petroleum Engineering Corp
Current assignee: Sinopec Oilfield Service Corp; Sinopec North China Petroleum Engineering Corp
Priority date: 2022-10-25
Filing date: 2022-10-25
Publication date: 2023-03-24
Anticipated expiration: 2032-10-25

Abstract

The utility model belongs to the technical field of the attach fitting between oil pipe and the instrument, concretely relates to abrasionproof set screw connector for coiled tubing. The anti-abrasion set screw connector for the continuous oil pipe comprises a connector body, wherein a threaded section used for being connected with a downhole tool is arranged at one end of the connector body, a through hole for the continuous oil pipe to penetrate through is formed in the connector body, a threaded hole is formed in the side wall of the connector body, and the threaded hole is used for tightly propping the continuous oil pipe in the through hole after the set screw penetrates through; the connector comprises a connector body and is characterized in that righting rings are arranged outside two ends of the connector body, the outer diameter of each righting ring is larger than that of the connector body, so that the connector body and the pipe wall of a sleeve are arranged at intervals in the radial direction, and threaded holes are formed between the righting rings at the two ends.

Description

Anti-abrasion set screw connector for continuous oil pipe

Technical Field

The utility model belongs to the technical field of the attach fitting between oil pipe and the instrument, concretely relates to abrasionproof set screw connector for coiled tubing.

Background

The coiled tubing is one of the commonly used petroleum site construction tools, the free end of the coiled tubing is connected with a downhole tool, and the connector is a bridge for connecting the coiled tubing and the downhole tool, and plays an important role in coiled tubing operation. Use more connector in the market at present for holding screw connector, its structural principle is shown as the chinese utility model patent of authorizing the publication number for CN207212290U and the chinese utility model patent of authorizing the publication number for CN215804399U, and holding screw connector includes the connector body usually, and there is the screw thread section one end of connector body, and the screw thread section is used for linking to each other with instrument in the pit, and this internal through-hole that has a perfect understanding of connector has set up the screw hole that radially link up on the lateral wall of connector body. During the use, coiled tubing penetrates in the through-hole of connector body, penetrates in the screw hole and the top tightly on coiled tubing's outer wall with holding screw to be in the same place coiled tubing and connector body coupling.

The problems with the current set screw connectors are: when the set screw connector is put into a well along with a coiled tubing, the coiled tubing is discharged from a winding drum, and the coiled tubing still has certain deflection, so when the set screw connector is applied to a vertical well, the deflection of the coiled tubing can drive the set screw connector to move along the wall of a sleeve, and the eccentric wear of the connector body is serious; when the connector is applied to a horizontal well, the weight of the set screw connector and the weight of a downhole tool are both large, and the connector body in the set screw connector is subjected to eccentric wear under the dead weight. Connector body eccentric wear can cause the connector body to damage, can't continue to use, can grind holding screw in addition, leads to holding screw to take place not hard up to drop, can lead to coiled tubing and connector body separation at the heavy load pulling in-process, finally causes downhole tool to fall into the well. Meanwhile, the set screw is usually an inner hexagonal screw, and after eccentric wear is serious, an inner hexagonal hole of the inner hexagonal screw can be ground off, so that the set screw cannot be disassembled by a wrench, and finally, the coiled tubing can be cut off to reinstall the connector, which brings troubles to production.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a wear-resistant holding screw connector for coiled tubing to solve among the prior art connector body and easily wear to damage and lead to the technical problem that downhole tool dropped.

In order to achieve the above object, the utility model provides a wear-resistant set screw connector for coiled tubing's technical scheme is: an anti-abrasion set screw connector for a continuous oil pipe comprises a connector body, wherein one end of the connector body is provided with a threaded section used for being connected with a downhole tool, a through hole for the continuous oil pipe to penetrate through is formed in the connector body, a threaded hole is formed in the side wall of the connector body, and the threaded hole is used for tightly pushing the continuous oil pipe in the through hole after the set screw penetrates through; the connector comprises a connector body and is characterized in that righting rings are arranged outside two ends of the connector body, the outer diameter of each righting ring is larger than that of the connector body, so that the connector body and the pipe wall of a sleeve are arranged at intervals in the radial direction, and threaded holes are formed between the righting rings at the two ends.

Has the advantages that: when the connector is used, the centralizing ring is contacted with the inner wall of the sleeve, and a gap is formed between the connector body and the pipe wall of the sleeve, so that the connector body is prevented from being worn, and the connector body is reliably protected; the abrasion of the set screw is avoided, the phenomenon that the underground tool falls off due to the loosening of the set screw is avoided, and the situation that the coiled tubing needs to be cut off due to the fact that the set screw cannot be detached is avoided. The centralizing ring can be replaced after being worn, and the cost is lower.

Preferably, the centralizing ring is threadedly fitted on the connector body. The centralizing ring is assembled through threads, the centralizing ring is more convenient to replace after being worn, and the centralizing ring can be designed and produced in batches and in a standardized manner.

Preferably, one of the two centralizing rings which is adjacent to the downhole tool in use is defined as a lower centralizing ring and the other as an upper centralizing ring; the downside of righting the ring down is the inclined plane with the last side of righting the ring on, and the downside of righting the ring down just extends along radially from inside to outside slope from bottom to top, the upside of righting the ring on from top to bottom just extends along radially from inside to outside slope. The lower side surface of the lower centering ring guides the connector when the coiled tubing is lowered, and the upper side surface of the upper centering ring guides the connector when the coiled tubing is lifted, so that the connector crosses a necking part in the casing.

Preferably, the upper righting ring and the lower righting ring are symmetrical structures which are symmetrical about the axial section. The upper centralizing ring and the lower centralizing ring are of symmetrical structures, the upper end and the lower end do not need to be distinguished during installation, the installation is convenient, and the symmetrical structures are also convenient to process.

Preferably, the threaded hole is a countersunk threaded hole. The set screw can sink into countersunk screw hole completely, avoids the set screw to expose, further protects the set screw.

Preferably, the threaded hole is spirally arranged in plurality in the axial direction of the connector body. The threaded holes are spirally arranged, so that axial and circumferential stress can be taken into consideration, and the connection strength between the continuous oil pipe and the connector is improved.

Preferably, the connector body comprises a large hole section for the penetration of the coiled tubing and a small hole section provided with the thread section. The threaded section is used for connecting downhole tools, and the threaded section is a small hole section, and the wall thickness of the connector body at the position is larger, and the connection strength of the connector body and the downhole tools is also higher.

Preferably, the inner wall of the large hole section is provided with a ring groove, and a sealing ring is embedded in the ring groove. The sealing ring ensures the sealing performance between the coiled tubing and the connector, and liquid entering the downhole tool through the coiled tubing is not easy to leak.

Preferably, the annular grooves on the large pore section are arranged at least twice at intervals along the axial direction. At least two ring grooves can further improve the sealing performance.

Preferably, one end of the connector body, through which the coiled tubing penetrates, is a tapered end, and the outer diameter of the tapered end gradually decreases in a direction away from the threaded section. When lifting up, the taper end can guide the connector.

Drawings

Fig. 1 is a schematic structural view of an anti-wear set screw connector for a coiled tubing provided by the present invention;

description of reference numerals:

1. a connector body; 2. a through hole; 3. an upper righting ring; 4. a tapered end; 5. a threaded hole; 6. a threaded segment; 7. a lower righting ring; 8. a first ring groove; 9. a second ring groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, which may be present, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, elements recited by the phrases "comprising a," 8230, "" etc. are not intended to exclude processes, methods, and the like, in which such elements are included.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from the specific situation.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from the specific situation.

The present invention will be described in further detail with reference to examples.

The utility model provides a coiled tubing is with concrete embodiment of abrasionproof holding screw connector:

as shown in fig. 1, an anti-wear set screw connector (hereinafter, simply referred to as a connector) for a coiled tubing is used to connect a downhole tool and the coiled tubing, and for convenience of description, one end of the connector connected to the downhole tool is defined as a lower end, and the other end is defined as an upper end, and the connector includes a connector body 1, an upper centering ring 3, and a lower centering ring 7.

The connector body 1 is of a vertically-through cylindrical structure, and the connector body 1 is formed by casting, has certain tensile strength and compressive strength, and is solid and reliable in industrial production. The connector body 1 is internally provided with a through hole 2, the through hole 2 is used for a coiled tubing to penetrate, as shown in fig. 1, the lower end of the connector body 1 is provided with a threaded section 6, the threaded section is an external threaded section, of course, the threaded section can be an internal threaded section in other embodiments, and the threaded section 6 is used for connecting a downhole tool. The connector body 1 integrally comprises a large hole section above and a small hole section below, the thread section 6 is located on the small hole section, the wall thickness of the thread section 6 can be increased, and the connection strength is improved. The inner wall of the large hole section is provided with a first ring groove 8 and a second ring groove 9, wherein the first ring groove 8 and the second ring groove 9 are arranged close to the lower end, and the other embodiments can also be arranged close to the upper end. Sealing rings (not shown) are embedded in the first ring groove 8 and the second ring groove 9, and after the coiled tubing penetrates through the sealing rings, the sealing rings are deformed to realize sealing. In other embodiments, the number of the ring grooves can be increased or decreased according to actual conditions.

Still seted up 16 screw holes 5 on the inner wall of macropore section, screw hole 5 is countersunk head screw hole, and holding screw can sink into screw hole 5 completely, prevents to expose. The 16 threaded holes 5 are spirally arranged along the up-down direction, and of course, in other embodiments, the number and arrangement direction of the threaded holes 5 may be changed according to actual situations. The upper end of the connector body 1 is a taper end 4, the outer diameter of the taper end 4 is gradually increased from top to bottom, and the taper end 4 is arranged to guide the connector to pass through the necking part in the sleeve when the coiled tubing is lifted up.

As shown in fig. 1, the outer threads are processed on the outer sides of the upper end and the lower end of the connector body 1, the upper righting ring 3 is installed at the outer thread of the upper end, the lower righting ring 7 is installed at the outer thread of the lower end, the upper righting ring 3 and the lower righting ring 7 are identical in structure, the upper righting ring 3 and the lower righting ring 7 are both of annular structures, the inner diameter is 58mm, the outer diameter is 79mm, and the inner hole is internally provided with an inner thread. Taking the above centering ring 3 as an example, both the upper and lower side surfaces of the upper centering ring 3 are inclined surfaces, and the upper centering ring 3 is a symmetrical structure symmetrical about the axial section as a whole; the inclined direction of the upper side face is inclined from top to bottom and radially from inside to outside, and the inclined direction of the lower side face is inclined from top to bottom and radially inwards.

During the use, will go up rightting ring 3, right 7 screw-thread assemblings of ring down on connector body 1, install the sealing washer in first annular 8, the second annular 9, penetrate connector body 1 with coiled tubing from the last port, extrude the sealing washer and realize sealing, penetrate screw hole 5 with 16 holding screws in, with coiled tubing top tight fixation in connector body 1, with instrument connection in the pit on screw thread section 6. When the coiled tubing is put into the well, the upper righting ring 3 and the lower righting ring 7 are in direct contact with the wall of the casing, the upper righting ring 3 and the lower righting ring 7 are subjected to the action of friction force to cause abrasion in the process of lowering and lifting the coiled tubing, so that the connector body 1 and the wall of the casing are arranged at intervals in the radial direction, the connector body 1 and the set screw are prevented from being abraded, and the connector body 1 and the set screw are protected. After the device is used for a period of time, the upper righting ring 3 and the lower righting ring 7 which are seriously worn are replaced.

In this embodiment, since the connector body 1 is radially spaced from the wall of the casing when in use, the threaded hole 5 may not be limited to a countersunk threaded hole, and a common constant diameter threaded hole may be used normally. In other embodiments, the arrangement of the threaded holes 5 can be changed and selected according to actual conditions.

In this embodiment, the upper and lower side surfaces of the upper and lower centering rings 3 and 7 are inclined surfaces, and in fact, when the device is used, only the upper side surface of the upper centering ring 3 and the lower side surface of the lower centering ring 7 play a role in guiding in the process of lifting and lowering, so in other embodiments, only the upper side surface of the upper centering ring 3 and the lower side surface of the lower centering ring 7 can be kept as inclined surfaces, and the other two side surfaces can be planes perpendicular to the axial direction. In other embodiments, the upper and lower sides of the upper and lower centralizing rings 3 and 7 may be both planes perpendicular to the axial direction.

In this embodiment, the upper end of the connector body 1 is a tapered end. In other embodiments, the upper end surface of the connector body 1 may be a plane perpendicular to the axial direction.

In this embodiment, the upper centering ring 3 and the lower centering ring 7 are assembled on the connector body 1 by means of threads, so that subsequent disassembly and replacement are facilitated. However, in the present invention, as long as the connector body 1 has the upper righting ring 3 and the lower righting ring 7 for protecting the connector body 1, the problems of dropping down-hole tools can be avoided, and based on the purpose, in other embodiments, the connection mode between the righting ring and the connector body 1 can be changed, for example, the righting ring is fixed on the connector body by screws; or may be welded directly.

Finally, it should be noted that the above mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that the technical solutions described in the foregoing embodiments may be modified without inventive effort, or some technical features may be substituted equally. 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

1. An anti-abrasion set screw connector for a coiled tubing comprises a connector body (1), wherein a threaded section (6) used for being connected with a downhole tool is arranged at one end of the connector body (1), a through hole (2) for the coiled tubing to penetrate through is formed in the connector body (1), a threaded hole (5) is formed in the side wall of the connector body (1), and the threaded hole (5) supports the coiled tubing which is located in the through hole (2) after the set screw penetrates through; the method is characterized in that: the connector comprises a connector body (1), wherein two ends of the connector body (1) are externally provided with righting rings, the outer diameters of the righting rings are larger than the outer diameter of the connector body (1), so that the connector body (1) and the pipe wall of a sleeve are arranged at intervals in the radial direction, and threaded holes (5) are formed between the righting rings at the two ends.

2. The coiled tubing wear resistant set screw connector of claim 1, wherein: the centralizing ring is assembled on the connector body (1) in a threaded manner.

3. The coiled tubing wear resistant set screw connector of claim 1, wherein: defining one of the two centralizing rings, which in use is close to the downhole tool, as a lower centralizing ring (7), and the other as an upper centralizing ring (3); the lower side face of the lower righting ring (7) and the upper side face of the upper righting ring (3) are inclined planes, the lower side face of the lower righting ring (7) obliquely extends from bottom to top and from inside to outside along the radial direction, and the upper side face of the upper righting ring (3) obliquely extends from top to bottom and from inside to outside along the radial direction.

4. The coiled tubing wear resistant set screw connector of claim 3, wherein: the upper righting ring (3) and the lower righting ring (7) are symmetrical structures which are symmetrical about the axial section.

5. The coiled tubing wear resistant set screw connector of any of claims 1-4, wherein: the threaded hole (5) is a countersunk threaded hole.

6. The coiled tubing wear resistant set screw connector of any of claims 1-4, wherein: the threaded holes (5) are spirally arranged along the axial direction of the connector body (1).

7. The coiled tubing wear resistant set screw connector of any of claims 1-4, wherein: the connector body (1) comprises a large hole section for the penetration of the coiled tubing and a small hole section provided with the thread section (6).

8. The coiled tubing wear resistant set screw connector of claim 7, wherein: and an annular groove is arranged on the inner wall of the large hole section, and a sealing ring is embedded in the annular groove.

9. The coiled tubing wear resistant set screw connector of claim 8, wherein: at least two annular grooves are arranged on the large hole section at intervals along the axial direction.

10. The coiled tubing wear resistant set screw connector of any of claims 1-4, wherein: one end of the connector body (1) for the coiled tubing to penetrate is a conical end (4), and the outer diameter of the conical end (4) is gradually reduced along the direction departing from the threaded section (6).