CN210422499U

CN210422499U - Sand-proof centralizer easy to mill

Info

Publication number: CN210422499U
Application number: CN201921159141.2U
Authority: CN
Inventors: 李常友; 王勇; 李鹏; 梁伟; 陈雪; 贾维霞; 张川庭
Original assignee: China Petroleum and Chemical Corp; Sinopec Research Institute of Petroleum Engineering Shengli Co
Current assignee: China Petroleum and Chemical Corp; Sinopec Research Institute of Petroleum Engineering Shengli Co
Priority date: 2019-07-22
Filing date: 2019-07-22
Publication date: 2020-04-28
Anticipated expiration: 2029-07-22

Abstract

The utility model discloses an easy overlap milling sand control centralizer, include parent tube, spring, right the piece and set up three at least, right the piece and be peripheral at the parent tube according to the equal angular distribution of axis of parent tube, spring one end and the radial inboard side fixed connection who right the piece, the other end is connected with the fixed surface of parent tube, right the piece radial outside limit to right the piece on the side set up a transition on the hypotenuse, right the piece radial outside limit to right the piece under the side set up a transition hypotenuse. And the righting piece is provided with a through sand cleaning round hole. When the sleeve milling is used for salvaging, the centering sheet can retract, so that the sleeve milling barrel can smoothly pass through the centering device. Meanwhile, the centering piece is provided with the round hole, so that sand accumulated on the centering piece can be conveniently removed, the success rate of casing milling and salvaging of the pipe column is integrally improved, and the construction period is effectively shortened.

Description

Sand-proof centralizer easy to mill

Technical Field

The utility model belongs to the technical field of oil and gas exploitation well sand control technique and specifically relates to an easy cover mills sand control centralizer.

Background

The sand control tubular column that present oil and gas exploitation well was used no matter hangs sand screen sand control, still gravel packing sand control, all need add the centralizer in the tubular column so that the tubular column is gone into the in-process and is placed in the middle to prevent that the screen pipe from colliding with the damage at the in-process of going into the well. However, in the later salvaging process of the sand control failure, the sand control pipe column is buried by the produced sand of the stratum or the manually filled gravel, so that the salvaging, lifting and rotating of the sand control pipe column are difficult. And the load of the derrick exceeds the load of minor repair operation, and only a treatment mode of milling one section and salvaging one section can be adopted. The process technology has certain limitations, such as the rigid centralizer has larger outer diameter, and the milling sleeve cannot descend when being blocked; a large amount of stratum sand or filling sand exists between the blades of the centralizer, so that the centralizer is not easy to clean during casing milling. Therefore, the milling and salvaging labor intensity is high, the well occupying period is greatly prolonged, the problems that a milling cylinder falls into a well and the like are easily caused, and the accident is complicated. Therefore, a sand-proof centralizer which is easy to mill at the later stage is urgently needed in the operation field.

Application No.: 201710508579.6 discloses a spring type centralizer, which comprises an upper joint, a lower joint, a centralizing sleeve, a spring seat, a universal ball and an air spring, wherein the centralizing sleeve is arranged along a stepped shaft of the upper joint, the centralizing sleeve is of an annular ring body structure, and circular blind holes are uniformly formed in the annular ring body; the spring seat is installed in the blind hole of the centering sleeve through a screw, the universal ball is installed on the upper portion of the spring seat, and the air spring is installed between the centering sleeve and the lower connector. The invention can reduce friction between the centralizer and the pipeline wall and reduce radial and axial impact force on the centralizer through the pipeline section with irregular caliber. But the holes formed by the centralizing sleeve are not easy to remove sand after sand enters. And the utility model discloses a be big space between the upper and lower clamping ring, it is unrestricted between the piece to right, and easy sand removal in addition opens the round hole on the piece of righting, and the sand removal effect is further strengthened.

Application No.: 201710273667.2 relates to a centralising apparatus for a downhole fishing tool. The technical scheme is as follows: the inner centralizing sleeve is of an annular ring body structure; the spring seat is cylindrical and is fixedly connected with the inner centering sleeve through a screw; the righting ball is placed in the spring seat; the outer centering sleeve is composed of an upper half ring and a lower half ring, the upper half ring and the lower half ring are fixed through locking screws, 3 blind holes of the inner centering sleeve and 6 through holes of the outer centering sleeve are uniformly formed in the circumferential direction; the upper joint is cylindrical, an internal thread is formed at one end of the upper joint, an external thread is formed at the other end of the upper joint, a central through hole is formed in the upper joint, and a step is formed in the middle of the upper joint; the lower joint is cylindrical, one end of the lower joint is provided with an internal thread, the other end of the lower joint is provided with an external thread, and a central through hole is formed. The invention enables the fishing tool to smoothly pass through irregular well diameter and simultaneously realizes the reduction of lifting and lowering friction force and transverse impact force. But the holes formed by the centralizing sleeve are not easy to remove sand after sand enters. And the utility model discloses a be big space between the upper and lower clamping ring, it is unrestricted between the piece to right, and easy sand removal in addition opens the round hole on the piece of righting, and the sand removal effect is further strengthened.

Application No.: 201610282591.5 provides a variable diameter centralizer, comprising: a central tube body; the centering bars are uniformly distributed on the outer side surface of the central tube body along the circumferential direction, each centering bar comprises an axial sliding section, an upper connecting section, a well wall contact section and a lower connecting section which are sequentially hinged from top to bottom, and the lower connecting section is hinged with the central tube body; the radial elastic distance adjusting device is connected between the well wall contact section and the outer side face of the central pipe; and the elastic limiting device is sleeved on the central pipe and is contacted with the outer side of each axial sliding section. The variable-diameter centralizer can be used for centralizing according to the change of the well diameter, is particularly suitable for irregular well bores with reduced diameter or large-belly well sections, and overcomes the defects of the prior art.

Application No.: 201820005934.8 discloses a resilient centralizer comprising: the sucker rod penetrates through the guide hole and can reciprocate in the guide hole; the outer surface of the righting piece is an arc surface matched with the shape of the inner surface of the sleeve; one end of the compression spring is fixedly connected with the inner surface of the righting sheet, and the other end of the compression spring is fixedly connected with the outer surface of the body part so as to support the righting sheet on the inner surface of the sleeve; and the rubber layer is arranged on the outer surface of the righting sheet so as to increase the friction force between the righting sheet and the sleeve. The utility model discloses with sheathed tube position relatively fixed during the use, the sucker rod operation in-process can not cause sleeve pipe wearing and tearing, fracture, simultaneously, this somatic part with right the piece by compression spring connection, have the clearance between the two, through this somatic part with right the annular gap between the piece and produce oil, it is efficient to produce oil. But the above structure cannot pass through the shell milling drum smoothly.

Technical scheme and the technical problem that will solve and the beneficial effect who produces of above disclosure technique all with the utility model discloses inequality, to the utility model discloses more technical characteristics and the technical problem and the beneficial effect that will solve all do not have the technological inspiration in the above technical document that discloses.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an easy shell milling sand control centralizer when the shell milling is salvaged, the piece of righting can contract back to a shell milling section of thick bamboo can be smoothly through the centralizer. Meanwhile, the centering piece is provided with the round hole, so that sand accumulated on the centering piece can be conveniently removed, the success rate of casing milling and salvaging of the pipe column is integrally improved, and the construction period is effectively shortened.

In order to achieve the purpose, the utility model discloses a following technical scheme, an easy overlap mills sand control centralizer, include parent tube, spring, right the piece and set up three at least, right the piece and be peripheral at the parent tube according to the equal angular distribution of axis of parent tube, spring one end with right the radial inboard edge of piece and be connected, the other end is connected with the surface of parent tube, right the piece radial outside limit and set up a transition and go up the hypotenuse to right the piece on the side, right the piece radial outside limit and set up a transition hypotenuse down to right under the piece side. And the righting piece is provided with a through sand cleaning round hole.

The device also comprises a righting sheet sleeve seat which is sheathed or welded on the outer wall of the base pipe in a screw thread manner.

The centering sheet sleeve seat is provided with a centering sheet telescopic window which is radially communicated, and the centering sheet is arranged in the centering sheet telescopic window.

The upper end and the lower end of the radial inner side edge of the righting piece are axially protruded outwards to form an upper clamping shoulder and a lower clamping shoulder respectively, and the upper clamping shoulder and the lower clamping shoulder are radially limited on the inner wall of the righting piece sleeve seat.

The outer wall of the upper end of the base pipe is provided with an external thread, and the outer wall of the lower end of the base pipe is provided with an external thread.

Compared with the prior art, the utility model following beneficial effect has:

the utility model discloses centralizer mills when salvaging at the cover, and it can return back to right the piece, and it has the round hole to right to open on the piece simultaneously, is convenient for pile up the grit on right the piece and clears away to wholly promote the tubular column cover and mill and salvage the success rate, effectively shortened construction cycle.

When the sand control tubular column is put down, the righting piece is under the action of the spring pre-jacking force, and the righting effect of the righting piece on the tubular column is ensured. When the sleeve mill is used for fishing, the sleeve milling barrel applies a certain pressure to the centering piece, the centering piece compresses the spring, and the centering piece retracts, so that the sleeve milling barrel can smoothly pass through the centering device. Meanwhile, as the circular holes are formed in the centralizer blades, sand accumulated between the centralizing pieces is easy to loosen when the centralizer blades are washed, the salvaging success rate of the pipe column is improved, the construction period of the sleeve milling construction is effectively shortened, the operation cost is saved, the production cost is obviously reduced, and the centralizer has good use effect and application value.

Drawings

Fig. 1 is a schematic structural view of an easy-milling sand-proof centralizer of the present invention;

fig. 2 is a cross-sectional view of fig. 1.

In the figure: the base tube 1, right piece cover seat 2, spring 3, right piece 4, sand removal round hole 5.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 2, the present invention provides a technical solution:

the utility model provides an easy washover sand control centralizer, includes parent tube 1, spring 3, right piece 4, right the piece and set up three at least, right the piece and surround at the parent tube according to the equal angular distribution of axis of parent tube, spring one end and the radial inboard side fixed connection who right the piece, the other end is connected with the surface fixed of parent tube, right the radial outside limit of piece and right the piece on the side set up a transition hypotenuse, right the radial outside limit of piece and set up a transition hypotenuse down to right piece under the side. The setting of two upper and lower hypotenuses, the cover mills a section of thick bamboo through, and the cover mills a section of thick bamboo inner wall and extrudees the hypotenuse, can make smoothly and right the piece withdrawal, prevents the fastener. And the righting piece is provided with a sand cleaning round hole 5 which is transversely communicated. The sand accumulated on the centralizing piece is convenient to remove, so that the success rate of casing milling and salvaging of the pipe column is integrally improved, and the construction period is effectively shortened.

Still including righting the piece cover seat 2, righting the screw thread formula suit of piece cover seat or welding at the parent tube outer wall, righting the flexible window of piece of righting that the piece cover seat set up radially link up, righting the piece and installing in righting the flexible window of piece.

The upper end and the lower end of the base pipe are provided with threads which are connected with the pipe column. The centralizing piece sleeve seat is in threaded connection with the base pipe 1, and the centralizing piece 4 is fixed on the base pipe. The centralizing pieces 4 are provided with round holes, so that sand accumulated between the centralizing pieces can be conveniently cleaned during milling. The spring 3 is fixed between the upper pressure ring 2, the lower pressure ring 5 and the righting sheet 4, and gives a certain pre-jacking force to the righting sheet 4.

When carrying out sand control tubular column and going into, right piece 4 under the effect of spring 3 jacking force in advance, guaranteed to right the effect of righting of piece to the tubular column. When the sleeve mill is used for fishing, the sleeve mill barrel applies a certain pressure to the centering piece 4, the centering piece 4 compresses the spring 3, and the centering piece 4 retracts, so that the sleeve mill barrel can smoothly pass through the centering device. Meanwhile, as the circular holes are formed in the centralizer blades 4, sand accumulated between the centralizing pieces 4 is easy to loosen when the centralizer blades are washed, the salvaging success rate of the pipe column is improved, the construction period of the casing milling construction is effectively shortened, the operation cost is saved, the production cost is obviously reduced, and the centralizer has good use effect and application value.

The innovation points are as follows: when the casing milling and fishing are carried out on the patent centralizer, the righting piece can retract, meanwhile, the round hole is formed in the righting piece, sand accumulated on the righting piece is convenient to clear, accordingly, the success rate of casing milling and fishing of the pipe column is integrally improved, and the construction period is effectively shortened.

From the perspective view of fig. 1, it is clear that sand washing is easy to loosen after sand is accumulated on the centralizer vanes. As can be seen from figure 2, the centralizer blade is internally provided with a transverse groove, and the spring is connected between the base pipe and the transverse groove, so that the centralizer can retract and prevent deviation. Meanwhile, the spring is sealed in a closed space formed by the centralizer blade and the blade sleeve seat, and the problems of sand blocking and incapability of retracting the centralizer blade are solved.

When the centralizer is used for casing milling and salvaging, the righting piece can retract, and meanwhile, the round hole is formed in the righting piece, so that sand accumulated on the righting piece can be conveniently removed, the success rate of casing milling and salvaging of the pipe column is integrally improved, and the construction period is effectively shortened.

In the description of the present invention, it should be understood that the orientation indication or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description of the present invention, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an easy cover mills sand control centralizer, includes parent tube, spring, the piece of righting sets up three at least, and the piece of righting is peripheral at the parent tube according to the equal angular distribution of axis of parent tube, spring one end is connected with the radial inboard side of the piece of righting, and the other end is connected with the surface of parent tube, its characterized in that, the radial outside limit of the piece of righting is seted up a transition and is gone up the hypotenuse to the piece of righting on the side, and the radial outside limit of the piece of righting is seted up a transition hypotenuse down to the piece of righting side down, set up the clear sand round hole that.

2. The sand control centralizer for easy milling of claim 1, further comprising a centralizer casing screwed or welded on the outer wall of the base pipe.

3. The sand-prevention centralizer easy to mill is characterized in that the centralizing piece sleeve seat is provided with a radially through centralizing piece telescopic window, and the centralizing piece is installed in the centralizing piece telescopic window.

4. The sand-prevention centralizer easy to mill is claimed in claim 3, wherein the upper end and the lower end of the radial inner side edge of the righting plate are axially protruded outwards to form an upper clamping shoulder and a lower clamping shoulder respectively, and the upper clamping shoulder and the lower clamping shoulder are radially limited on the inner wall of the righting plate sleeve seat.

5. The sand control centralizer easy to mill is claimed in claim 4, wherein the outer wall of the upper end of the base pipe is provided with external threads, and the outer wall of the lower end of the base pipe is provided with external threads.