CN211008535U - Junk overshot - Google Patents
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- CN211008535U CN211008535U CN201921697999.4U CN201921697999U CN211008535U CN 211008535 U CN211008535 U CN 211008535U CN 201921697999 U CN201921697999 U CN 201921697999U CN 211008535 U CN211008535 U CN 211008535U
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Abstract
The utility model relates to an oil recovery engineering borehole operation fishing tool technical field, concretely relates to junk overshot. The junk overshot comprises: the cylinder is used for being connected with the oil pipe column; the hinge is hinged in the barrel and used for swinging upwards to open the lower end barrel opening of the barrel during reverse circulation well flushing and swinging downwards to close the lower end barrel opening of the barrel when the reverse circulation well flushing is stopped; the junk overshot further comprises: the magnetic block is fixed in the cylinder and is positioned above the loose-leaf; the magnetic block is used for providing magnetic attraction force for falling objects; and when the lower end opening of the cylinder body is closed by the loose-leaf, the magnetic blocks, the loose-leaf and the cylinder body jointly enclose a containing cavity for containing corresponding falling objects. Like this, the junk gets into under well-flushing liquid and magnetic path magnetic force combined action and holds the chamber, has increased the junk and has got into the success rate that holds the chamber, and when carrying the tubular column on, also can fall on the loose-leaf and be taken out even junk breaks away from with the magnetic path, has improved the success rate that the junk was salvaged.
Description
Technical Field
The utility model relates to an oil recovery engineering borehole operation fishing tool technical field, concretely relates to junk overshot.
Background
In the production and operation processes of oil-water wells, small steel falling objects such as pipe plugs, valve balls, clamp teeth, bolts, screw caps and the like often fall into the well bottom, a fishing tool needs to be connected to the lower end of an oil pipe column and put into the well during fishing, liquid is pumped into an annular space between a sleeve and an oil pipe from the ground to carry out reverse circulation well washing when the oil-water well reaches the well bottom, and the falling objects are flushed into an inner cavity of the fishing tool by the impact force of the liquid.
The main method for fishing small steel falling objects in each oil field comprises the following steps: firstly, the next grappling barrel is used for salvaging, secondly, the lower grinding shoe is used for grinding and washing out small fallen objects, and thirdly, the strong magnetic salvaging device is used for sucking out the steel fallen objects. Although the salvaging barrel can lead the fallen objects into the salvaging barrel, the salvaging effect is poor because the claw teeth can not be completely or partially folded in the salvaging process because the bottom hole of the artificial well or the top of the fishing rod is irregular. Although the milling shoe can mill steel parts, falling objects such as a screw plug, a valve ball, a jaw, a bolt and a nut are unstable in fish tops, and the falling objects are easy to rotate, slide and move or do circular motion together with the milling shoe in the milling process, so that the milling effect is reduced. The utility model discloses a utility model patent that the bulletin number is CN202645487U discloses a strong magnetism fisher, and suction through magnet catches the steel junk, because the lower part of strong magnetism fisher is uncovered, at the oil pipe tubular column in-process that plays, the oil pipe tubular column produces with inside pipe wall or sleeve pipe coupling and bumps and hang the vibration, leads to the junk to fall the well again, and the oil pipe tubular column breaks out simultaneously and produces the vibration, also can fall the junk, causes to salvage the failure.
The utility model discloses a utility model patent that the publication number of granting is CN204804734U discloses a smallclothes junk fisher, during the use, top connection upper portion is connected with the well workover tubular column, lower part and barrel welding, and lower part inner chamber one side of barrel is equipped with the baffle, and the opposite side sets up the support circular bead, and the loose-leaf passes through the axle and articulates on the baffle. When the fallen objects are salvaged, the pump is started to reversely circulate and wash the well, the fluid enables the side, in contact with the shoulder, of the hinge to turn upwards, the fallen objects enter the inner cavity of the barrel body along with the fluid, the hinge is restored to a closed state after the pump is stopped, and the fallen objects are stopped to realize salvage. For the falling objects with larger weight, the falling objects are difficult to enter the inner cavity of the cylinder body only under the action of fluid, and the problem of fishing failure is also easily caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a junk overshot to improve the salvage success rate of junk.
The utility model discloses a junk overshot adopts following technical scheme:
the junk overshot comprises:
the cylinder is used for being connected with the oil pipe column;
the hinge is hinged in the barrel and used for swinging upwards to open the lower end barrel opening of the barrel during reverse circulation well flushing and swinging downwards to close the lower end barrel opening of the barrel when the reverse circulation well flushing is stopped;
the junk overshot further comprises:
the magnetic block is fixed in the cylinder and is positioned above the loose-leaf; the magnetic block is used for providing magnetic attraction force for falling objects;
when the lower end opening of the cylinder body is closed by the loose-leaf, the magnetic blocks, the loose-leaf and the cylinder body jointly enclose an accommodating cavity for accommodating corresponding falling objects.
The utility model has the advantages that: when fishing the fallen objects, connecting the fallen object fishing barrel to the lower end of the oil pipe column and putting the lower end of the oil pipe column into the well, starting a pump to perform reverse circulation well washing when the lower end of the barrel is arranged above the fallen objects by a certain distance, enabling well washing liquid to enter from a barrel opening at the lower end of the barrel and prop open a hinge, enabling the fallen objects to enter an accommodating cavity under the combined action of flushing force of the well washing liquid and magnetic force of a magnetic block, stopping the pump after the reverse circulation well washing operation is completed, closing the barrel opening at the lower end of the barrel by the self weight of the hinge, enabling the fallen objects to fall on the hinge or be attracted and held in the accommodating cavity by the magnetic block, taking out the fishing pipe column, and taking; like this, the junk gets into under well-flushing liquid and magnetic path magnetic force combined action and holds the chamber, has increased the junk and has got into the success rate that holds the chamber, and when carrying the tubular column on, also can fall on the loose-leaf and be taken out of the well even junk breaks away from with the magnetic path, has improved the success rate that the junk was salvaged.
According to a preferable technical scheme, the barrel comprises a main barrel and an auxiliary barrel, the auxiliary barrel is detachably connected to the lower portion of the main barrel, the magnetic blocks are arranged in the main barrel, and the hinge is hinged to the auxiliary barrel.
Has the advantages that: when the falling objects are taken out from the containing cavity after being fished out, the auxiliary cylinder body can be detached from the main cylinder body, so that the falling objects can be taken out conveniently.
As a preferred technical scheme, the magnetic block is an annular magnetic block, and an inner hole of the magnetic block is used for allowing well-flushing liquid to pass through; the junk fishing barrel further comprises a support sleeve arranged in the main barrel body, and the lower end of the support sleeve is in stop fit with the top of the auxiliary barrel body; the main cylinder is internally provided with a positioning structure, the upper end of the magnetic block is in stop fit with the positioning structure, and the lower end of the magnetic block is in stop fit with the upper end face of the supporting sleeve so as to fix the magnetic block in the main cylinder.
Has the advantages that: the magnetic block is convenient to fix and disassemble.
As a preferred technical solution, the main cylinder includes a large diameter section and a small diameter section, the large diameter section is located on the upper portion of the small diameter section, and the inner diameter of the large diameter section is greater than that of the small diameter section, and the positioning structure is formed by a transition portion of the large diameter section and the small diameter section.
Has the advantages that: make things convenient for the design and processing of main cylinder body, and the setting up of big footpath section and path section makes and holds the chamber and have sufficient accommodation space.
As a preferred technical scheme, the outer diameter of the large-diameter section is larger than that of the small-diameter section, the transition part is an inclined section which is gradually inclined outwards from top to bottom, and the upper end of the magnetic block is in blocking fit with the lower end of the inclined section.
Has the advantages that: in the process of lifting the pipe column, the inclined section can effectively slow down the collision and hanging of the junk overshot and the casing coupling, and the smooth pulling-out of the pipe column is ensured.
Preferably, the auxiliary cylinder has a ring-shaped portion inside the main cylinder, and the hinge is hinged to an upper end surface of the ring-shaped portion.
Has the advantages that: the convenient loose-leaf is connected on the auxiliary cylinder body.
As a preferred technical scheme, the number of the hinges is at least two, each hinge is of a fan-shaped structure and is uniformly distributed along the circumferential direction of the auxiliary cylinder body at intervals.
Has the advantages that: like this, the quality of each loose-leaf is lighter relatively, changes the lower extreme nozzle of barrel and opens completely under the well-flushing liquid effect, and then makes things convenient for the junk to get into and holds the chamber, improves the salvage success rate of junk.
As a preferred technical scheme, the lower end of the cylinder body is of a bell mouth structure and is used for guiding corresponding falling objects to enter the accommodating cavity.
Has the advantages that: the horn mouth structure is favorable to guiding the junk to get into and holds the chamber, improves the junk and salvages the success rate.
As a preferable technical scheme, the magnetic block is an annular magnetic block, and an inner hole of the magnetic block is used for allowing the well-flushing liquid to pass through.
Has the advantages that: the magnetic block is the annular magnetic block, not only makes things convenient for the fixed of magnetic block in the barrel, and has stronger magnetic force, is favorable to improving the success rate that the junk gets into and holds the chamber, and then improves the salvage success rate of junk.
As a preferred technical scheme, the upper end of the cylinder body is provided with a thread structure for being in threaded connection with an oil pipe column.
Has the advantages that: the barrel and the oil pipe column can be conveniently detached.
Drawings
Fig. 1 is a schematic structural view of a junk overshot according to an embodiment 1 of the present invention, and a schematic structural view of a junk overshot according to an embodiment 2 of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
fig. 3 is a schematic structural view of a junk overshot according to an embodiment 6 of the present invention;
fig. 4 is a schematic structural view of the junk overshot according to the embodiment 7 of the present invention.
In the figure: 1-main cylinder; 2-a magnetic block; 3-supporting the sleeve; 4-loose leaves; 5-auxiliary cylinder body; 6-shaft seat; 7-bolt; 11-small diameter section; 12-an inclined section; 13-a large diameter section; 14-step surface; 15-blocking platform; 41-rotating shaft; 51-bell mouth configuration.
Detailed Description
The small falling objects in the prior art are salvaged by using the fishing barrel, and the following problems exist: when the falling objects are fished out by strong magnetic adsorption, the problem that the falling objects fall into the well again due to the fact that the oil pipe is in collision with the inner wall of the casing pipe in the oil pipe lifting process exists; when the mode that the loose-leaf receives the salvaged object is used for fishing out the fallen object, the fallen object with larger weight cannot enter the upper part of the loose-leaf, so that the salvage fails.
And the utility model discloses a junk overshot, when salvaging the junk, the junk gets into under the combined action of well-flushing liquid impulsive force and magnetic path magnetic force and holds the intracavity, later accepts the junk by the loose-leaf, and the junk is avoided falling into in the well again when lifting out junk overshot, has improved the success rate that the junk was salvaged.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below 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, 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, the terms "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, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
The utility model discloses a junk overshot's embodiment 1:
as shown in fig. 1, the junk overshot comprises a barrel body which comprises a main barrel body 1 and an auxiliary barrel body 5, wherein the main barrel body 1 is connected above the auxiliary barrel body 5. The upper end of the main cylinder body 1 is provided with internal threads to form a joint for connecting with an oil pipe column. The auxiliary cylinder 5 comprises a section with a larger diameter and a section with a smaller diameter, the outer diameter of the section with the larger diameter is larger than that of the section with the smaller diameter, the section with the smaller diameter is inserted into the main cylinder 1 and is in threaded connection (not shown in the figure) with the main cylinder 1, and the upper end face of the section with the larger diameter is in stop fit with the lower end face of the main cylinder 1.
The auxiliary cylinder 5 is provided with an annular part which is positioned in the main cylinder 1, the upper end surface of the annular part is hinged with four hinges 4, as shown in fig. 2, the four hinges 4 are arranged, the structure of each hinge 4 is the same and is a fan-shaped structure, and the four hinges 4 are uniformly distributed along the circumferential direction of the auxiliary cylinder 5 at intervals. Specifically, a rotating shaft 41 is fixed at the tail of the hinge 4, cylindrical insertion shafts (not shown in the figure) are arranged at two axial ends of the rotating shaft 41, paired shaft seats 6 are fixed on the annular part, insertion holes are arranged on the shaft seats 6, and the hole diameters of the insertion holes are larger than the diameters of the insertion shafts. When the loose-leaf 4 is connected with the auxiliary cylinder 5, the inserting shafts at two ends of the rotating shaft 41 are inserted into the inserting holes of the paired two shaft seats 6, then the shaft seats 6 are fixed on the annular part through the bolts 7, the axial positions of the rotating shaft 41 are limited through the shaft seats 6 which are arranged in pairs, and the connection of the loose-leaf 4 and the auxiliary cylinder 5 is realized. Of course, in other embodiments, the shaft seat can be directly fixed on the annular part of the auxiliary cylinder body by welding.
The loose-leaf 4 adopts the connection mode, so that the loose-leaf 4 can be opened upwards only when being acted by an upward force, and the loose-leaf 4 is in a closed state by self weight under the condition of not being acted by an external force.
Before reverse circulation well washing, the loose leaf 4 is kept in a state of closing the lower end opening of the auxiliary cylinder 5 by self weight; when the well is washed by reverse circulation, the hinge 4 swings upwards by the impact of the well washing liquid, and the lower end opening of the auxiliary cylinder 5 is opened; when the reverse circulation well washing is stopped, the hinge 4 swings downwards by self weight and is stopped by the upper end face of the annular part, the lower end opening of the auxiliary cylinder 5 is closed, and a relatively closed cavity for accommodating small falling objects is formed above the hinge 4.
The magnet 2 is fixed in the main cylinder 1, the magnet 2 is positioned above the hinge 4, the magnet 2 is an annular magnet, and an inner hole of the magnet 2 is used for the well-flushing liquid to pass through. When the hinge 4 closes the lower end opening of the auxiliary cylinder 5, the magnetic block 2, the hinge 4, the main cylinder 1 and the auxiliary cylinder 5 jointly enclose a relatively closed cavity which is used as an accommodating cavity for accommodating corresponding falling objects.
The junk overshot also comprises a supporting sleeve 3, and the inner diameter of the supporting sleeve 3 is larger than that of the magnetic block 2 and larger than that of the annular part.
The main barrel 1 comprises a large-diameter section 13, a small-diameter section 11 and an inclined section 12, the inner diameter and the outer diameter of the large-diameter section 13 are larger than the small-diameter section 11, the inclined section 12 is connected between the large-diameter section 13 and the small-diameter section 11, and the inclined section 12 is gradually inclined outwards from top to bottom. The upper end of the magnetic block 2 is in blocking fit with the lower end of the inclined section 12, the lower end of the magnetic block is in blocking fit with the support sleeve 3, the lower end of the support sleeve 3 is in blocking fit with the upper end face of the annular part, so that the magnetic block 2 is fixed in the main cylinder 1, and the inclined section 12 forms a transition part between the large-diameter section 13 and the small-diameter section 11 in the embodiment and forms a positioning structure in the embodiment.
An inclined section 12 is arranged between the large-diameter section 13 and the small-diameter section 11 of the main cylinder body 1, and the main function is to slow down the collision and hanging of the junk fishing barrel and the casing collar in the process of lifting the pipe column.
In the process of fishing operation, the junk fishing barrel is connected to the lower end of the oil pipe and is put into the well, when the lower end of the auxiliary barrel 5 is lowered to a position 2-3 meters above the top of a fish, a pump is started for backwashing, and well washing liquid enters the inner cavity of the junk fishing barrel through the lower part of the auxiliary barrel 5 and is discharged back to the ground. The junk fishing barrel is slowly lowered while flushing, the fishing pipe column is rotated positively in the lowering process, so that the lower part of the auxiliary barrel body 5 enters the top of the fish, the pump pressure is raised at the moment, the loose leaf 4 is opened, and the junk enters the accommodating cavity at the upper part of the loose leaf 4 under the action of the flushing fluid and the attraction force of the magnetic block 2; after the back washing operation is finished, the pump is stopped, the hinge 4 is closed, the falling objects fall on the hinge 4 or are adsorbed by the magnetic block 2 and kept in the containing cavity, the fishing pipe column is lifted out, the falling object fishing barrel is dismounted from the oil pipe, the auxiliary barrel body 5 and the main barrel body 1 are dismounted at the threaded connection position, and the falling objects are taken out. In order to facilitate the falling objects to enter the accommodating cavity, the lower end of the auxiliary cylinder 5 is provided with a bell-mouth structure 51, and the bell-mouth structure 51 is used as a guide shoe to guide the corresponding falling objects to enter.
The junk fishing device in this embodiment of use can not only salvage the smallclothes steel junk to junk fishing device on, can effectively collect the junk in relative confined cavity moreover, carries the fishing string in-process at last, and the junk can not fall the well again, has improved the fishing success rate of junk.
The utility model discloses a junk overshot's embodiment 2:
the cylinder in the above embodiment 1 includes the main cylinder 1 and the auxiliary cylinder 5, and the main cylinder 1 and the auxiliary cylinder 5 are connected by screw threads. In the process of fishing operation, the junk fishing barrel is connected to the lower end of the oil pipe and is put into the well, and finally the junk enters the accommodating cavity at the upper part of the hinge 4 under the action of well washing liquid and magnetic block attraction force; after the back washing operation is finished, the loose leaf 4 is closed, and falling objects fall on the loose leaf 4 or are adsorbed by the magnetic block 2 and kept in the containing cavity; and (5) taking out the fishing pipe column, dismounting the junk fishing barrel from the oil pipe, dismounting the auxiliary barrel 5 and the main barrel 1 at the threaded connection part, and taking out the junk.
The junk overshot in this embodiment with the utility model discloses a junk overshot's concrete embodiment 1 compares, and the difference mainly lies in: as shown in fig. 1, the cylinder in this embodiment is an integrated structure, i.e. the main cylinder 1 is fixed above the auxiliary cylinder 5 by welding. The auxiliary cylinder 5 comprises a section with a larger diameter and a section with a smaller diameter, the outer diameter of the section with the larger diameter is larger than that of the section with the smaller diameter, the section with the smaller diameter is inserted into the main cylinder 1 and is welded and fixed with the main cylinder 1 (not shown in the figure), and the upper end face of the section with the larger diameter is in stop fit with the lower end face of the main cylinder 1.
When the junk overshot in the embodiment is used for fishing operation, after the fishing pipe column is lifted up and the junk overshot is dismounted from the oil pipe, the main barrel body 1 and the auxiliary barrel body 5 cannot be detached, and at the moment, the containing cavity is opened in a mode of upwards turning the hinge 4 to take out the junk. Compared with the junk overshot in the embodiment 1, the junk overshot in the embodiment has the problem that junk is inconvenient to take out from the barrel body, but the junk overshot in the embodiment has the advantages of simple integral structure and convenience in use. The convenient use is embodied as follows: before the junk overshot is put into the well, when the junk overshot is connected with the oil pipe, the process of connecting the main cylinder body and the auxiliary cylinder body is omitted, and the junk overshot is conveniently connected with the oil pipe.
The utility model discloses a junk overshot's embodiment 3:
the main cylinder in embodiment 1 includes a large-diameter section, a small-diameter section, and an inclined section, and the upper end of the magnetic block is in blocking fit with the lower end of the inclined section, and the lower end of the magnetic block is in blocking fit with the support sleeve. When the magnetic block is fixed in the cylinder, the magnetic block is firstly placed in the main cylinder, then the support sleeve is inserted in the main cylinder, and the lower end of the magnetic block is blocked by the support sleeve to realize the positioning of the magnetic block in the cylinder.
The junk overshot in this embodiment with the utility model discloses a junk overshot's concrete embodiment 1 compares, and the difference mainly lies in: the junk fishing barrel in this embodiment does not include a support sleeve, and an extending portion extending upward is disposed at the upper end of the auxiliary barrel, the upper end of the magnetic block is in blocking fit with the lower end of the inclined section, and the lower end of the magnetic block is in blocking fit with the upper end face of the extending portion, so as to achieve the positioning of the magnetic block in the main barrel, which is substantially equivalent to the support sleeve and the auxiliary barrel in embodiment 1 being made into an integrated structure.
When the magnetic block is fixed in the cylinder in the embodiment, the magnetic block is firstly placed in the main cylinder, then the end, provided with the extension part, of the auxiliary cylinder is inserted into the main cylinder, meanwhile, the auxiliary cylinder is in threaded connection with the main cylinder, and the lower end of the magnetic block is stopped by the extension part of the auxiliary cylinder, so that the magnetic block is positioned in the cylinder.
The utility model discloses a junk overshot's embodiment 5:
the magnet in embodiment 1 is an annular magnet, the upper end of the annular magnet is in blocking fit with the lower end of the inclined section, the lower end of the annular magnet is in blocking fit with the support sleeve, and the lower end of the support sleeve is in blocking fit with the upper end face of the annular part, so that the annular magnet is fixed in the main cylinder.
The junk overshot in this embodiment with the utility model discloses a junk overshot's concrete embodiment 1 compares, and the difference mainly lies in: the magnetic path in this embodiment is the magnetic stripe, and the magnetic stripe disclosed in the concrete utility model patent that adopts the authorization notice number to be CN202645487U, the fixed mode of magnetic stripe is also the same with the fixed mode of magnetic stripe disclosed in the utility model patent that the authorization notice number is CN 202645487U.
The utility model discloses a junk overshot's embodiment 6:
the main cylinder in embodiment 1 includes a large diameter section, a small diameter section, and an inclined section, and the inclined section constitutes a transition portion between the large diameter section and the small diameter section in embodiment 1, and also constitutes the positioning structure in embodiment 1.
The junk overshot in this embodiment with the utility model discloses a junk overshot's concrete embodiment 1 compares, and the difference mainly lies in: as shown in fig. 3, the transition portion in this embodiment is a step surface 14, that is, the main cylinder 1 in this embodiment only includes the large diameter section 13 and the small diameter section 11, and the large diameter section 13 and the small diameter section 11 are connected by the step surface 14.
In the embodiment, the upper end of the magnetic block 2 of the junk overshot is in stop fit with the step surface 41, the lower end of the magnetic block 2 is in stop fit with the support sleeve 3, the lower end of the support sleeve 3 is in stop fit with the upper end surface of the annular part, the magnetic block 2 is fixed in the main cylinder 1, the step surface 14 forms a transition part of the large-diameter section and the small-diameter section in the embodiment, and the step surface 14 simultaneously forms a positioning structure in the embodiment.
The utility model discloses a junk overshot's embodiment 7:
in the embodiment 1, the main cylinder includes the large diameter section, the small diameter section, and the inclined section, the upper end of the magnetic block is in stop fit with the lower end of the inclined section, the lower end of the magnetic block is in stop fit with the support sleeve, the lower end of the support sleeve is in stop fit with the upper end face of the annular portion, so that the magnetic block is fixed in the main cylinder, and the inclined section constitutes the positioning structure in the embodiment 1.
The junk overshot in this embodiment with the utility model discloses a junk overshot's concrete embodiment 1 compares, and the difference mainly lies in: as shown in fig. 4, in the present embodiment, the main cylinder 1 is a straight cylinder structure with a uniform axial aperture, a stop 15 is welded and fixed inside the straight cylinder structure, and the stop 15 constitutes the positioning structure in the present embodiment. In the cylinder, the upper end of the magnetic block 2 is in blocking fit with the lower end face of the blocking table 15, the lower end of the magnetic block is in blocking fit with the support sleeve 3, the lower end of the support sleeve 3 is in blocking fit with the upper end face of the annular part, and the magnetic block 2 is fixed in the main cylinder 1.
The blocking platform 15 may be an annular blocking platform or a block-shaped blocking platform. When the baffle table 15 is an annular baffle table, the inner hole of the annular baffle table is used for the well-flushing liquid to pass through; when the baffle 15 is a block-shaped baffle, a plurality of baffles 15 are arranged at intervals along the inner circumferential surface of the main cylinder 1, and the intervals between the baffles 15 and the space surrounded by the baffles 15 are used for the well-flushing liquid to pass through.
The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A junk overshot, comprising:
the cylinder is used for being connected with the oil pipe column;
the hinge is hinged in the barrel and used for swinging upwards to open the lower end barrel opening of the barrel during reverse circulation well flushing and swinging downwards to close the lower end barrel opening of the barrel when the reverse circulation well flushing is stopped;
characterized by, the junk overshot still includes:
the magnetic block is fixed in the cylinder and is positioned above the loose-leaf; the magnetic block is used for providing magnetic attraction force for falling objects;
when the lower end opening of the cylinder body is closed by the loose-leaf, the magnetic blocks, the loose-leaf and the cylinder body jointly enclose an accommodating cavity for accommodating corresponding falling objects.
2. The junk overshot of claim 1, wherein the cylinder comprises a main cylinder and an auxiliary cylinder, the auxiliary cylinder is detachably connected below the main cylinder, the magnet is arranged in the main cylinder, and the hinge is hinged on the auxiliary cylinder.
3. The junk overshot of claim 2, wherein the magnet is an annular magnet, and an inner hole of the magnet is used for the flushing fluid to pass through; the junk fishing barrel further comprises a support sleeve arranged in the main barrel body, and the lower end of the support sleeve is in stop fit with the top of the auxiliary barrel body; the main cylinder is internally provided with a positioning structure, the upper end of the magnetic block is in stop fit with the positioning structure, and the lower end of the magnetic block is in stop fit with the upper end face of the supporting sleeve so as to fix the magnetic block in the main cylinder.
4. The junk overshot of claim 3 wherein the main cylinder includes a major diameter section and a minor diameter section, the major diameter section being located at an upper portion of the minor diameter section and having an inner diameter greater than an inner diameter of the minor diameter section, the locating structure being formed by a transition between the major diameter section and the minor diameter section.
5. The junk overshot of claim 4, wherein the outer diameter of the large diameter section is larger than that of the small diameter section, the transition part is an inclined section which is gradually inclined outwards from top to bottom, and the upper end of the magnetic block is in stop fit with the lower end of the inclined section.
6. The junk overshot according to any one of claims 2-5, wherein the auxiliary cylinder has a ring shaped portion inside the main cylinder, the hinge being hinged to an upper end surface of the ring shaped portion.
7. The junk overshot of any one of claims 1-5, wherein there are at least two of the hinges, each hinge having a fan-shaped configuration and being spaced circumferentially around the auxiliary cylinder.
8. The junk overshot of any one of claims 1-5, wherein the lower end of the body is flared for directing the respective junk into the receiving cavity.
9. The junk overshot of claim 1 or 2, wherein the magnet is an annular magnet, and an inner hole of the magnet is used for the flushing fluid to pass through.
10. The junk overshot of any one of claims 1-5, wherein the upper end of the body is provided with a threaded formation for threaded connection to a tubing string.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921697999.4U CN211008535U (en) | 2019-10-11 | 2019-10-11 | Junk overshot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921697999.4U CN211008535U (en) | 2019-10-11 | 2019-10-11 | Junk overshot |
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| Publication Number | Publication Date |
|---|---|
| CN211008535U true CN211008535U (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921697999.4U Active CN211008535U (en) | 2019-10-11 | 2019-10-11 | Junk overshot |
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| CN (1) | CN211008535U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113338833A (en) * | 2021-06-28 | 2021-09-03 | 刘辉 | Drifting gauge and fishing tool combined device |
| CN114059951A (en) * | 2020-07-31 | 2022-02-18 | 中国石油化工股份有限公司 | Fishing type falling-proof device and falling-proof device using same |
-
2019
- 2019-10-11 CN CN201921697999.4U patent/CN211008535U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114059951A (en) * | 2020-07-31 | 2022-02-18 | 中国石油化工股份有限公司 | Fishing type falling-proof device and falling-proof device using same |
| CN114059951B (en) * | 2020-07-31 | 2024-04-26 | 中国石油化工股份有限公司 | Fishing type falling-preventing device and falling-preventing device using same |
| CN113338833A (en) * | 2021-06-28 | 2021-09-03 | 刘辉 | Drifting gauge and fishing tool combined device |
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