CN208534439U - A kind of Multilayer casing pipe cutting knife - Google Patents

Abstract

A kind of Multilayer casing pipe cutting knife, including top connection, piston, central tube, piston bush, tool apron main body, cutter, lower center tube and lower contact, top connection, piston bush, tool apron main body and lower contact pass sequentially through threaded connection, it is connected through a screw thread between piston and central tube, and piston is mounted on the upper end of central tube, central tube is applied in top connection, piston and tool apron body interior, upper spring is provided on central tube, upper spring one end is limited by the end face of piston, the other end is limited by the end face of tool apron main body, lower center tube is arranged in tool apron body interior, equally distributed three long hole slots are provided in tool apron main body, cutter is provided in long hole slot, cutter is connect by pin shaft with tool apron main body, cutting tooth is provided on cutter, the liquid-passing hole for being cleaned and being cooled down to cutter is provided on lower center tube, on lower center tube It is provided with lower spring, once goes into the well and completes the cutting of multilayer sleeve, no replacement is required cutter, improves construction efficiency.

Description

A kind of Multilayer casing pipe cutting knife

Technical field

The utility model relates to a kind of Multilayer casing pipe cutting knifes, specifically exactly a kind of to apply in petroleum gas oil well The downhole tool of middle Casing-Cutting, the tool can once cut multilayer sleeve.

Background technique

State at a low ebb always due to oil price in recent years, so that many old fileds are faced with huge existence both at home and abroad Pressure, the exploitation of old filed have come into the middle and later periods, and many old wells need repairing and secondary operation, old well servicing and secondary work Casing-Cutting is frequently necessary in industry.It for some lows yield and the well exploited, needs to be shut down and abandoned to handle, especially pair For marine abandoned well, how the casing at 4m below mud line quickly to be cut off as problem in the urgent need to address.For Such case, domestic and international experts and scholars conduct in-depth research it, especially carry out design again to original cutter With improvement, and more deep theoretical research is expanded to it.But existing cutter can not be kept away during Casing-Cutting That exempts from has the following deficiencies: first is that majority of case is once to go into the well that a kind of set of specification can only be cut in existing cutter Pipe, the multilayer sleeve if necessary to cut plurality of specifications just need repeatedly to make a trip, and replace cutting tool, serious in this way The time is wasted, and is difficult to find original position accurately when having replaced cutter and having been gone into the well and cut again, it will is led Position inaccurate is caused, is likely to result in and Repeated Cutting is carried out to the casing for having cut completion, it is serious to reduce working efficiency, Increase operating cost；Second is that existing cutter complete cutting cutter is withdrawn during, by the self weight of cutter itself The contraction of cutter is completed, but this structure probably will appear cutter during use cannot freely be retracted to tool apron In main body, so that tool is during upper mention, cutter is still stuck in casing that tool is above mentioned is motionless, if firmly It is too quickly that serious destruction may be caused to cutter；Third is that now most of cutter during use it is more or less all It will appear the abrasion of cutter than more serious, phenomena such as service life is not high, and cutting effect is bad, and stock-removing efficiency is lower.

Summary of the invention

The purpose of this utility model is to provide a kind of Multilayer casing pipe cutting knifes, solve the problems, such as existing cutter technology And deficiency, the cutting of multilayer sleeve, no replacement is required cutter can be completed by once going into the well, and greatly improve construction efficiency, be solved existing Have cutter because replacement cutter caused by secondary location difficulty the problem of.Tool design cutter automatic recovery system, has cut It is automatically withdrawn into body interior at later cutter, knife cannot be automatically withdrawn by solving existing cutter cutter after cutting is completed Seat body interior and existing swaging clamp risk.The tool cutter flank of tooth is sharp, and hardness is high, long service life, along with having above Multiple through-holes play certain cleaning action to cutter, and efficiently against existing cutter serious wear, the service life is low to be asked Topic.

The technical solution adopted by the utility model to solve its technical problems is that: a kind of Multilayer casing pipe cutting knife, including above connect Head, piston, central tube, piston bush, tool apron main body, cutter, lower center tube and lower contact, the top connection, piston bush, tool apron Main body and lower contact pass sequentially through threaded connection, are connected through a screw thread between the piston and central tube, and piston is installed In the upper end of central tube, the central tube is applied in top connection, piston and tool apron body interior, on the central tube It is provided with upper spring, described upper spring one end is limited by the end face of piston, and the other end is limited by the end face of tool apron main body, The lower center tube setting is provided with equally distributed three long hole slots in tool apron body interior, the tool apron main body, Cutter is provided in long hole slot, the cutter is connect by pin shaft with tool apron main body, and cutting is provided on the cutter Tooth is provided with the liquid-passing hole for being cleaned and being cooled down to cutter on the lower center tube, is provided on the lower center tube Lower spring.

As optimization, it is connected through a screw thread between the top connection and piston bush, and between top connection and central tube It is sealed by O-ring.

It as optimization, is connected through a screw thread between the piston and central tube, and leads between piston and central tube It crosses O-ring to be sealed, the screw of anti-rotation effect has been provided between the piston and central tube.

As optimization, the central tube upper end is internally provided with nozzle, and passes through O between central tube and nozzle Shape circle is sealed, and the position of the central tube installation nozzle is provided with the hole card spring limited to nozzle, described In the card slot of the centrally disposed pipe of hole card spring.

As optimization, the upper spring is between piston bush and central tube and passes through the lower end surface of piston and tool apron master Shoulder at the internal bore groove of body upper surface is limited.

As optimization, two rows of cutting tooths are studded on the cutter, and equally distributed six apertures are provided among cutting tooth For the cleaning and cooling to cutter, cutting tooth is hard alloy blocks.

As optimization, the upper end of the cutter is provided with through-hole, the center line and the pin shaft hole in tool apron main body of the through-hole Center line be overlapped, one end of pin shaft is provided with dovetail groove and threaded hole, dovetail key is provided in the dovetail groove of pin shaft, described Dovetail key is fixed by screw.

As optimization, the outside of the lower half portion of the lower center tube is lower spring, and lower spring is located at tool apron main body Inside, and limited by the outer shoulder of lower center tube and the interior shoulder of lower contact.

As optimization, counterbore is provided in the lower contact, screw is located at the lower half portion of the counterbore and lower center tube In keyway, there is washer between screw and the counterbore of lower contact.

A kind of Multilayer casing pipe cutting knife, mainly by top connection, hole card spring, nozzle, O-ring, screw, piston, central tube, Piston bush, upper spring, tool apron main body, pin shaft, dovetail key, cutter, lower center tube, lower spring, washer, lower contact composition, it is special Sign is that top connection, piston bush, tool apron main body, lower contact pass sequentially through screw thread and be connected, and passes through O shape between top connection and piston bush Circle is sealed, and equally distributed a through-hole is provided on piston bush；In top connection, piston is located at the inside of top connection and passes through The lower end surface of top connection is limited, and a threaded hole is provided on piston, is managed centered on the inside of piston, the upper end of central tube it is interior Portion is provided with card slot, is connected through a screw thread between piston and central tube and O-ring is sealed, meanwhile, pass through the spiral shell in piston hole Nail is fixed and plays the role of anti-rotation, and the inside of central tube upper end is nozzle, between central tube and nozzle by O-ring into Row sealing, hole card spring are located in the card slot of central tube, play the role of limit to nozzle；In piston bush, the lower end of piston For upper spring, upper spring is between piston bush and central tube and passes through the inner hole of the lower end surface of piston and tool apron main body upper surface Shoulder at slot is limited, and equally distributed three long hole slots are provided in tool apron main body, and the top half of long hole slot is provided with a Cotter slot and pin shaft hole, cutter are located in three long hole slots of tool apron main body, stud with two rows of cutting tooths on cutter, in cutting tooth Between be provided with equally distributed six apertures for cleaning and cooling to cutter, cutting tooth is hard alloy blocks, the hard alloy Block is cylinder, and the material of use has high-wearing feature and high temperature resistance, and the upper end of cutter is provided with through-hole, the center line of the through-hole Be completely coincident with the center line of the pin shaft hole in tool apron main body and be fixed by pin shaft, one end of pin shaft be provided with dovetail groove and Threaded hole, dovetail key are located in the dovetail groove of pin shaft and it are fixed by screw, and lower center tube is located at the interior of a cutter There are through-hole in portion, the inside of lower center tube, and equally distributed 24 apertures are provided on the circumference of lower center tube, and the aperture is main For flowing through for liquid, certain cleaning and cooling effect are provided to cutter, improves the service life of cutter, under lower center tube End is provided with keyway, and the outside of the lower half portion of lower center tube is lower spring, and lower spring is located at the inside of tool apron main body, and under passing through The outer shoulder of central tube and the interior shoulder of lower contact are limited, and are provided with counterbore in lower contact, screw be located at the counterbore and it is lower in In the keyway of the lower half portion of heart pipe, there is washer between screw and the counterbore of lower contact.

The beneficial effects of the utility model are: compared with prior art, a kind of Multilayer casing pipe cutting knife of the utility model, one Secondary cut can cut all casings of completion, substantially increase construction efficiency, while the cutter of the Multilayer casing pipe cutting knife stretches width Spend bigger, a kind of casing of specification can only be cut by breaching traditional cutter and once going into the well, cutting efficiency is effectively raised, Operating cost is reduced, waste of time is avoided.The bottom of the tool increases a cutter retraction mechanism, when cutting is completed Lower spring Rapid reset will be made later by not generating chock pressure difference after casing, at throttle nozzle, and then drive lower center tube It pushes the bottom of cutter to automatically retract, avoids phenomenon that cutter cannot be freely retracted in tool apron main body and down-hole accident Occur, while also improving the service life of cutter.Hard alloy blocks are studded on the cutter of the tool, and it has been carried out in detail Thin type selecting and optimization, so that the cutter of design has the advantages that long service life, stock-removing efficiency is high, and wearability is high.

Detailed description of the invention

Fig. 1 is the utility model general structure schematic diagram；

Fig. 2 is the utility model A-A cross-sectional view；

Fig. 3 is the utility model tool apron main body perspective view；

Fig. 4 is the utility model cutter perspective view；

Wherein, 1 top connection, 2 hole card springs, 3 nozzles, 4O shape circle, 5 screws, 6 pistons, 7 central tubes, 8 piston bush, bullet on 9 Spring, 10 tool apron main bodys, 11 pin shafts, 12 dovetail keys, 13 cutteves, 14 lower center tubes, 15 lower springs, 16 washers, 17 lower contacts.

Specific embodiment

It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Usually here in attached drawing description and The component of the utility model embodiment shown can be arranged and be designed with a variety of different configurations.Therefore, below to attached The detailed description of the embodiments of the present invention provided in figure is not intended to limit the range of claimed invention, But it is merely representative of the selected embodiment of the utility model.Based on the embodiments of the present invention, ordinary skill people Member's every other embodiment obtained without creative efforts, belongs to the model of the utility model protection It encloses.

It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.

It is in the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", " perpendicular Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, or The invention product using when the orientation or positional relationship usually put, be merely for convenience of description the utility model and simplification retouched It states, rather than the device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation, Therefore it should not be understood as limiting the present invention.It is retouched in addition, term " first ", " second ", " third " etc. are only used for distinguishing It states, is not understood to indicate or imply relative importance.

A kind of Multilayer casing pipe cutting knife, mainly by top connection, hole card spring, nozzle, O-ring, screw, piston, central tube, Piston bush, upper spring, tool apron main body, pin shaft, dovetail key, cutter, lower center tube, lower spring, washer, lower contact composition, it is special Sign is that top connection 1, piston bush 8, tool apron main body 10, lower contact 17 pass sequentially through screw thread and be connected, top connection 1 and piston bush 8 it Between be sealed by O-ring 4, equally distributed 4 through-holes are provided on piston bush 8；In top connection 1, piston 6, which is located at, above to be connect First 1 inside is simultaneously limited by the lower end surface of top connection 1, is provided with a threaded hole on piston 8, centered on the inside of piston 8 Pipe 7, the inside of the upper end of central tube 7 are provided with 1 card slot, be connected through a screw thread between piston 8 and central tube 7 and O-ring 4 carry out it is close Envelope, meanwhile, it is fixed and plays the role of anti-rotation by the screw 5 in piston hole, the inside of 7 upper end of central tube is nozzle 3, It is sealed between central tube 7 and nozzle 3 by O-ring 4, hole card spring 2 is located in the card slot of central tube 7, plays to nozzle 3 The effect of limit；In piston bush 8, the lower end of piston 6 is upper spring 9, upper spring 9 between piston bush 8 and central tube 7 simultaneously It is limited by the lower end surface of piston 8 and the shoulder at the internal bore groove of 10 upper surface of tool apron main body, is provided in tool apron main body 10 Equally distributed three long hole slots, the top half of long hole slot are provided with 6 cotter slots and 3 pin shaft holes, and cutter 13 is located at tool apron In 3 long hole slots of main body 10, two rows of cutting tooths are studded on cutter 13, and equally distributed 6 apertures are provided among cutting tooth and are used In cleaning and cooling to cutter 13, cutting tooth is hard alloy blocks, which is cylinder, and the material of use has High-wearing feature and high temperature resistance, the upper end of cutter 13 are provided with 1 through-hole, the center line and the pin shaft hole in tool apron main body 10 of the through-hole Center line be completely coincident and pass through pin shaft 11 and be fixed, one end of pin shaft 11 is provided with 1 dovetail groove and threaded hole, dovetail key 12 It is fixed in the dovetail groove of pin shaft 11 and through screw 5, lower center tube 14 is located at the inside of 3 cutteves 13, under There is 1 through-hole in the inside of central tube 14, and equally distributed 24 apertures are provided on the circumference of lower center tube 14, which is mainly used for Liquid flows through, and certain cleaning and cooling effect are provided to cutter 13, improves the service life of cutter 13, lower center tube 14 Lower end is provided with 1 keyway, and the outside of the lower half portion of lower center tube 14 is lower spring 15, and lower spring 15 is located at the interior of tool apron main body 10 Portion, and limited by the outer shoulder of lower center tube 14 and the interior shoulder of lower contact 17,1 counterbore, spiral shell are provided in lower contact 17 Nail 5 is located in the keyway of the lower half portion of the counterbore and lower center tube 14, there is 1 washer between screw 5 and the counterbore of lower contact 17 16。

A kind of Multilayer casing pipe cutting knife generates section through throttle nozzle after liquid is flowed into top connection in the process of work Drift angle pushes central tube band piston compressed spring to move downward, and the bottom end of central tube, which will push cutter and strut outward, cuts Casing is cut, while cutter bottom end pushes lower center tube compressed spring to continue to move downward, wherein the distracted size of cutter is by signal Control, when the bottom end of lower center tube top moves downward stopping to after the interior shoulder of lower contact, and this moment cutter strut it is straight Diameter will also reach maximum value；For lower center tube during moving downward, liquid passes through multiple apertures on lower center tube side Outflow, is sprayed onto cutter up for liquid, the purpose is to clean and cool down；After cutting is completed, stop conveying into top connection Liquid, the chock pressure difference at throttle nozzle disappears at this time, and it is upward that lower spring will push lower center tube in the case where losing pressure Movement, the bottom end that lower center tube will push cutter again force cutter that can withdraw as soon as possible, are conducive to the cutter in this way and smoothly rise Out.

As another embodiment, in Fig. 1, liquid is entered by top connection, by the throttle nozzle of central tube front end, when When casing cutter does not enter working condition, under the action of upper spring, central tube and piston are in the position of the top, live at this time The shoulder portion of plug is contacted with the end face of top connection, and when entering working condition, the liquid with certain pressure enters top connection, Under the effect of the pressure, by the pressure of top connection and by pressure difference between throttle nozzle pressure oppress central tube and piston to Lower movement, upper spring are in compressive state herein, and with being continuously increased for pressure difference, upper spring compression degree is increasing, center Pipe constantly moves down, and the other end of central tube acts on the cutter of tool apron main body upper pin connection, by cutter Cam portion pushes cutter to rotate around pin shaft, is connected through a screw thread in central tube and Piston connecting portion point, is arranged on central tube There is calliper, the lower end surface of the lower end face contact of calliper upper surface and piston, calliper is contacted with the shoulder on central tube, passes through calliper Realize that piston is mounted on the different positions of central tube, piston is mounted on the different position of central tube, and control centre's pipe is different Maximum moving distance realizes the adjustment to cutter different rotation angle, so that it is different to realize that the utility model creates cutter cutting The function of the casing of specification, in initial position, the shoulder of piston is arranged inside piston bush, constantly moves down in piston In the process, the shoulder of piston constantly enters in the stepped hole of piston bush, enters when the shoulder of piston completely disengages piston bush inner wall When in piston bush stepped hole, the gap between piston and piston bush becomes larger, secondary piston and piston bush between fit closely, piston There are certain pressure differences between leading portion and the space of rear end, and after piston mobile certain position, piston nose and rear end are connected, There is no pressure difference, liquid then passes through top connection, flows through the gap between piston and piston bush, there are four circumference for setting on piston bush The through-hole of distribution, this through-hole are telltale hole, are flowed out after liquid pressure release by telltale hole, external detecting element passes through telltale hole liquid The size of physical examination observing and controlling cutter Casing-Cutting.

Above-mentioned specific embodiment is only the specific case of the utility model, and the scope of patent protection of the utility model includes But it is not limited to the product form and style of above-mentioned specific embodiment, it is any to meet the utility model and any technical field Those of ordinary skill's appropriate changes or modifications that it is done, should all fall into the scope of patent protection of the utility model.

Claims (9)

1. a kind of Multilayer casing pipe cutting knife, it is characterised in that: including top connection (1), piston (6), central tube (7), piston bush (8), Tool apron main body (10), cutter (13), lower center tube (14) and lower contact (17), the top connection (1), piston bush (8), tool apron Main body (10) and lower contact (17) pass sequentially through threaded connection, are connected between the piston (6) and central tube (7) by screw thread It connects, and piston (6) is mounted on the upper end of central tube (7), the central tube (7) is applied in top connection (1), piston (6) And tool apron main body (10) is internal, is provided with upper spring (9) on the central tube (7), the upper spring (9) one end passes through The end face of piston (6) limits, and the other end is limited by the end face of tool apron main body (10), and the lower center tube (14) is arranged in knife Seat main body (10) is internal, is provided with equally distributed three long hole slots in the tool apron main body (10), is respectively provided in long hole slot Have cutter (13), the cutter (13) is connect by pin shaft (11) with tool apron main body (10), and the cutter is arranged on (13) There is cutting tooth, the liquid-passing hole that cutter (13) is cleaned and cooled down is provided on the lower center tube (14), under described Lower spring (15) are provided on central tube (14).

2. a kind of Multilayer casing pipe cutting knife according to claim 1, it is characterised in that: the top connection (1) and piston bush (8) it is connected through a screw thread between, and is sealed between top connection (1) and central tube (7) by O-ring (4).

3. a kind of Multilayer casing pipe cutting knife according to claim 1, it is characterised in that: the piston (6) and central tube (7) Between be connected through a screw thread, and be sealed between piston (6) and central tube (7) by O-ring (4), the piston (6) screw (5) of anti-rotation effect has been provided between central tube (7).

4. a kind of Multilayer casing pipe cutting knife according to claim 1, it is characterised in that: described central tube (7) upper end it is interior Portion is provided with nozzle (3), and is sealed between central tube (7) and nozzle (3) by O-ring (4), the central tube (7) position for installing nozzle (3) is provided with the hole card spring (2) limited to nozzle (3), and the hole card spring (2) is set It sets in the card slot of central tube (7).

5. a kind of Multilayer casing pipe cutting knife according to claim 1, it is characterised in that: the upper spring (9) is located at piston It covers between (8) and central tube (7) and by the shoulder at the lower end surface of piston (6) and the internal bore groove of tool apron main body (10) upper surface It is limited.

6. a kind of Multilayer casing pipe cutting knife according to claim 1, it is characterised in that: stud with two rows on the cutter (13) Cutting tooth is provided with equally distributed six apertures among cutting tooth for cleaning and cooling to cutter (13), and cutting tooth is hard Matter alloy block.

7. a kind of Multilayer casing pipe cutting knife according to claim 1, it is characterised in that: the upper end of the cutter (13) is provided with The center line of through-hole, the through-hole is overlapped with the center line of the pin shaft hole on tool apron main body (10), and one end of pin shaft (11) is provided with swallow Stern notch and threaded hole are located in the dovetail groove of pin shaft (11) and are provided with dovetail key (12), and the dovetail key (12) passes through screw (5) It is fixed.

8. a kind of Multilayer casing pipe cutting knife according to claim 1, it is characterised in that: the lower half of the lower center tube (14) Partial outside is lower spring (15), and lower spring (15) is located at the inside of tool apron main body (10), and passes through lower center tube (14) Outer shoulder and the interior shoulder of lower contact (17) are limited.

9. a kind of Multilayer casing pipe cutting knife according to claim 1, it is characterised in that: it is heavy to be provided in the lower contact (17) Hole, screw (5) are located in the keyway of the lower half portion of the counterbore and lower center tube (14), and screw (5) is heavy with lower contact (17) There are washer (16) between hole.