CN207920567U - A kind of hydraulic-driven well mouth oil pipe cutter - Google Patents

Abstract

The application discloses a kind of hydraulic-driven well mouth oil pipe cutter, and hydraulic feed mechanism includes hydraulic cylinder and feed piston, positive pressurizing port is equipped in feed piston, feed piston lower end connects feed mandril；Hydraulic drive mechanism includes babinet, hollow spindle, hydraulic motor and gear drive, and hollow spindle is sheathed on outside feed mandril, and gear drive is connect with hollow spindle and hydraulic motor；Cutter knife mechanism includes cutter guiding axis, nut set, resetting spring, goes out knife mandril and internal cutter, cutter guiding axis is connect with hollow spindle bottom end, nut covers and goes out knife mandril threaded upper ends and connect, cutter guideway is set to nut set, resetting spring and goes out outside knife mandril, resetting spring is located at cutter guiding axis and goes out between knife mandril, resetting spring one end is connect with nut set bottom, and the other end is connect with knife mandril is gone out, and goes out below knife mandril to be equipped with the cutter mounting hole of installation internal cutter.The application realizes oil pipe automatic cutting, easy to operate, and safety and operating efficiency are high.

Description

A kind of hydraulic-driven well mouth oil pipe cutter

Technical field

This application involves petroleum industry workover rig technical field, more particularly to a kind of hydraulic-driven well mouth oil pipe cutter.

Background technology

During oil exploitation, such as when the high solidifying oil of exploitation, due to the high characteristic of high solidifying oil freezing point, workover treatment It is frequently run onto that tubing string is solidifying extremely to carry phenomena such as motionless, stuck in journey.In recent years, in order to improve the high mobility for coagulating oil, using to oil The new processes such as layer water filling, heat injection vapour；Cause in well that there are certain pressure, the difficulty of bigger is brought to well-repairing work.

For this purpose, the mode that traditional workover treatment is taken is：Valve pressure release is opened in first kill-job, then turns overhaul, energetically Upper lifting pipe post is buckled to；Alternatively, well head cuts off tubing string with means such as grinding wheel cutting, gas cuttings, discharges light maintenance back-off after stress, beats Fishing.However, both operational methods have that operating process is complicated, operating efficiency is low, and operation on serious violation well Specification may bring hidden danger to safety in production.

Utility model content

The application provides a kind of hydraulic-driven well mouth oil pipe cutter, low and safe to solve operating efficiency in a manner of existing well workover Property difference problem.

According to the embodiment of the present application, provide a kind of hydraulic-driven well mouth oil pipe cutter, from top to bottom successively include hydraulic pressure into Cutter mechanism, hydraulic drive mechanism and cutter knife mechanism, the hydraulic feed mechanism include cylinder body and feed piston, the feed piston Interior to be equipped with positive pressurizing port, the lower end of feed piston is connected with feed mandril；

The hydraulic drive mechanism includes that babinet, hollow spindle, hydraulic motor and the gear positioned at the box house pass Motivation structure, the hollow spindle are sheathed on the outside of feed mandril, and the hollow spindle runs through babinet, the gear drive It is connect respectively with hollow spindle and hydraulic motor；

The cutter knife mechanism includes cutter guiding axis, nut set, resetting spring, goes out knife mandril and internal cutter, the cutter The bottom end of guiding axis and hollow spindle connects, and the nut set is connect with the threaded upper ends for going out knife mandril, the cutter guiding axis Be sheathed on nut set, resetting spring and the outside for going out knife mandril, the resetting spring be located at cutter guiding axis and go out knife mandril it Between, described resetting spring one end is connect with the bottom that nut covers, and the other end of the resetting spring is connect with knife mandril is gone out, described Go out and be equipped with cutter mounting hole below knife mandril, the internal cutter is set in cutter mounting hole.

Optionally, the hydraulic-driven well mouth oil pipe cutter further includes cutter position adjusting mechanism, cutter position tune Complete machine structure includes rotation deck, internal thread pedestal and retaining spline ring, and the revotating card cover for seat is set to the outside of hollow spindle, institute The outside that internal thread base sheath is set to rotation deck is stated, the internal thread pedestal is threadedly coupled with rotation deck, the internal thread Pedestal is fixed on the bottom of box, and the retaining spline ring is fixed on outside rotation deck.

Optionally, the hydraulic-driven well mouth oil pipe cutter further includes well control mechanism, and the well control mechanism includes steel ball, institute The lower section that steel ball is located at feed mandril is stated, the steel ball is located between knife mandril and the tapered end face of hollow spindle, the steel The diameter of ball is more than the diameter of the tapered end face of the hollow spindle.

Optionally, the cutter guiding axis is internally provided with slide-bar, and the upper end of the internal cutter is provided with leads with the cutter The sliding slot parallel to axis, the slide-bar are located in sliding slot, and the lower face of the cutter mounting hole is the wedge structure tilted down, The lower face of the cutter mounting hole is matched with the internal cutter bottom shape.

Optionally, the bottom end of the cutter guiding axis is connected with centralizer, and the centralizer is internally provided with deep groove ball bearing.

Optionally, the hollow spindle both sides are arranged with upper bearing (metal) mounting hole, and the upper bearing (metal) mounting hole is located at babinet Top, the hollow spindle both sides are also arranged with lower bearing mounting hole, and the lower bearing mounting hole is located at the bottom of babinet, Angular contact ball bearing is equipped in the upper bearing (metal) mounting hole and lower bearing mounting hole, the angular contact ball bearing passes through fastening group Part is fixed on babinet, and the fastening assembly includes floor clip and round nut, and the upper bearing (metal) mounting hole is fixedly arranged above bearing Gland.

Optionally, it is equipped with copper sheathing between the upper end inner wall and the hollow spindle of the rotation deck.

Optionally, the cylinder body top is equipped with upper end cover, and the upper end of feed piston is under upper end cover, the cylinder body End sidewalls are equipped with reversed pressurizing port, and the reversed pressurizing port is connected with the inside of the cylinder body.

Optionally, the gear drive includes main drive gear and driven gear, the driven gear and hollow master The main shaft of axis connection, the main drive gear and hydraulic motor is connected by gear gland, the main drive gear and driven tooth Wheel is meshed, and the transmission ratio of the gear drive is 4：1.

Optionally, it is provided with size scale line on the upper end of the feed piston.

By above technical scheme it is found that being suitble to be fixed on the vertical valve of well head this application provides one kind, cutting with pressure A kind of hydraulic-driven, the oil pipe internal cutting equipment of feed of suspension and stuck oil pipe column, its working principle is that：Hydraulic oil passes through Positive pressurizing port enters, and pushes feed piston, feed piston compression reseting spring simultaneously feed mandril to be driven to move down, Jin Eryou Going out knife mandril pushes internal cutter to lean out point of a knife, meanwhile, hydraulic drive mechanism drives gear drive to operate by hydraulic motor, Main shaft is set to drive the rotation of cutter guiding axis so that internal cutter rotation cutting oil pipe makes feed mandril move up after oil pipe cut-out, Then under the action of resetting spring, internal cutter is repositioned to again in the cutter mounting hole of cutter guiding axis, then oil pipe cutting process It finishes.The effect that the application passes through hydraulic power supply, you can realize the automatic cutting of oil pipe, operating process is simple and reliable, can have Effect improves the operating efficiency of well-repairing work, and safe to use, is used not only in the workover treatment of the oil wells such as high-solidifiability oil well, commonly Oil pipe is stuck also can to repair operation by the technical solution of the application.

Description of the drawings

Fig. 1 is a kind of overall structure diagram of hydraulic-driven well mouth oil pipe cutter shown in the embodiment of the present application；

Fig. 2 is the structural schematic diagram of the hydraulic feed mechanism shown in the embodiment of the present application；

Fig. 3 is the structural schematic diagram of the hydraulic drive mechanism shown in the embodiment of the present application；

Fig. 4 is the structural schematic diagram of the cutter knife mechanism shown in the embodiment of the present application；

Fig. 5 is the structural schematic diagram of the cutter position adjusting mechanism shown in the embodiment of the present application.

In figure, 1- hydraulic feeds mechanism, 101- hydraulic cylinders, 102- feed pistons, 103- forward direction pressurizing ports, 104- feeds The lower end of piston, 105- feed mandrils, 106- upper end covers, the upper end of 107- feed pistons, the reversed pressurizing ports of 108-；2- liquid Press driving mechanism, 201- babinets, 202- hollow spindles, the tapered end face of 2021- hollow spindles, 203- hydraulic motors, 204- teeth Wheel drive mechanism, 205- upper bearing (metal) mounting holes, 206- lower bearing mounting holes, 207- angular contact ball bearings, 208- fastening assemblies, 2081- floor clips, 2082- round nuts, 209- bearing glands, 210- main drive gears, 211- driven gears, 212- hydraulic pressure horses The main shaft reached, 213- gear glands；3- cutter position adjusting mechanisms, 301- rotate deck, 302- internal thread pedestals, 303- retainings Spline ring, 304- copper sheathings, 305- soket head cap screws, 306- seam allowance boss；4- well controls mechanism, 401- steel balls；5- cutter knife mechanisms, 501- cutter guiding axis, 502- nut sets；503- resetting springs, 504- go out knife mandril, 505- internal cutters, 5051- sliding slots, 506- Cutter mounting hole, 507- slide-bars, 508- centralizers, 509- deep groove ball bearings；6- hydraulic hand-pumps, 601- hydraulic lines；7- is pressed The channel of well liquid.

Specific implementation mode

In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with attached drawing, it is right Technical solution in the embodiment of the present application is clearly and completely described.

Embodiment one

As shown in Figure 1, the present embodiment provides a kind of hydraulic-driven well mouth oil pipe cutteves, include from top to bottom hydraulic pressure successively into Cutter mechanism 1, hydraulic drive mechanism 2 and cutter knife mechanism 5, wherein hydraulic feed mechanism 1 is for controlling and adjusting internal cutter 505 Working condition；Hydraulic drive mechanism 2 drives cutter knife mechanism 5 to rotate, to realize the rotation of oil pipe column by hydraulic power supply Switching；Cutter knife mechanism 5 belongs to executing agency, and operation object is oil pipe column, to realize the purpose of oil well unfreezing and well workover.

Specifically, as shown in Fig. 2, hydraulic feed mechanism 1 includes hydraulic cylinder 101 and feed piston 102, feed piston Positive pressurizing port 103 is equipped in 102, the lower end 104 of feed piston is connected with feed mandril 105.The hydraulic feed mechanism 1 Hydraulic hand-pump 6 can be used in power source, and hydraulic hand-pump 6 and positive pressurizing port 103, manual liquid are connected to by hydraulic line 601 Hydraulic oil is pumped into positive pressurizing port 103 by press pump 6, and feed piston 102 is made to be moved down in hydraulic cylinder 101, to band Dynamic feed mandril 105 moves down, and so that cutter knife mechanism 5 is in feed state, this feed mode pressure control is simple, operator Member may be located remotely from well head and carry out remote operation, and then improve the safety of operation.

Meanwhile as shown in figure 3, hydraulic drive mechanism 2 includes babinet 201, hollow spindle 202, hydraulic motor 203 and is located at Gear drive 204 inside babinet 201, hollow spindle 202 are sheathed on the outside of feed mandril 105, and hollow spindle 202 passes through Babinet 201 is worn, gear drive 204 is connect with hollow spindle 202 and hydraulic motor 203 respectively.202 inside of hollow spindle is Hollow structure is equivalent to the channel that feed mandril 105 moves up and down.Hydraulic motor 203 is power source, can pass through bolt/screw Equal fasteners are fixed on babinet 201, and the advantages of selecting hydraulic motor is, it is small, torque is big, easy to operate, work when No-spark generates, and so that hydraulic power unit is may be located remotely from operation field with longer hydraulic line, securely and reliably, meets oil well operation rule Model.The operating that gear drive 204 is driven by hydraulic motor 203 makes hollow spindle 202 rotate, and hollow rotating shaft 202 turns It is dynamic that cutter knife mechanism 5 can be driven to link, to realize the rotation switch mode of oil pipe column.

For said gear transmission mechanism 204, its concrete structure, the gear drive will be further illustrated here 204 include main drive gear 210 and driven gear 211, and driven gear 211 can be connect with hollow spindle 202 by flat key, main biography Moving gear 210 is connect with the main shaft 212 of hydraulic motor by gear gland 213, main drive gear 210 and 211 phase of driven gear Engagement drives hollow spindle 202 to rotate, and the transmission ratio of gear drive 204 is 4：1, it is low to make hollow spindle 202 obtain Rotating speed, large torque are conducive to the cutting of oil pipe column.

Optionally, 202 both sides of hollow spindle are arranged with upper bearing (metal) mounting hole 205, and upper bearing (metal) mounting hole 205 is located at babinet 201 top, 202 both sides of hollow spindle are also arranged with lower bearing mounting hole 206, and lower bearing mounting hole 206 is located at babinet 201 Bottom, be equipped with angular contact ball bearing 207, angular contact ball bearing in upper bearing (metal) mounting hole 205 and lower bearing mounting hole 206 207 are fixed on babinet 201 by fastening assembly 208, and fastening assembly 208 includes floor clip 2081 and round nut 2082, upper axis It holds mounting hole 205 and is fixedly arranged above bearing gland 209.Bearing gland 209 fixes the outer shroud of angular contact ball bearing 207, angular contact The inner ring of ball bearing 207 is compressed by floor clip 2081 and round nut 2082, can prevent angular contact ball bearing 207 from pine occurs It is dynamic.By the way that the bearing arrangement is arranged, makes hollow spindle 202 that can both bear larger radial load, can also bear certain axial direction Power, the compacter stabilization of overall structure are conducive to the intensity and service life that improve equipment.

As shown in figure 4, cutter knife mechanism 5 includes cutter guiding axis 501, nut set 502, resetting spring 503, goes out knife mandril 504 and internal cutter 505, cutter guiding axis 501 connect with the bottom end of hollow spindle 202, nut set 502 with go out knife mandril 504 Threaded upper ends connect, and cutter guiding axis 501 is sheathed on nut set 502, resetting spring 503 and the outside for going out knife mandril 504, resets Spring 503 is located at cutter guiding axis 501 and goes out between knife mandril 504, and 503 one end of resetting spring and the bottom of nut set 502 connect It connects, the other end of resetting spring 503 is connect with knife mandril 504 is gone out, and is gone out 504 lower section of knife mandril and is equipped with cutter mounting hole 506, inside cuts Knife 505 is set in cutter mounting hole 506.

Can U-shaped connecting hole, the bottom end for connecting hollow spindle 202 be set on 501 top of cutter guiding axis.Nut set 502 are located at cutter guiding axis 501 and go out in the gap of knife mandril 504, and nut set 502 and the threaded upper ends for going out knife mandril 504 Connection when then feed mandril 105 moves down, can drive nut set 502 and go out knife mandril 504 while moving down, then nut simultaneously 502 compression reseting springs 503 are covered, and internal cutter 505 can be pushed by going out knife mandril 504, so that the point of a knife of internal cutter 505 is leant out cutter and led To axis 501, in the case where hollow spindle 202 drives cutter guiding axis 501 to rotate, cutter circumgyration incision oil pipe column, until Cut-out.After oil pipe cut-out, hydraulic feed mechanism 1 is reversely suppressed, feed mandril 105 is made to move up, then is returned in resetting spring 503 Under the action of multiple power, go out the reset of knife mandril 504, then internal cutter 505 is repositioned to again in cutter mounting hole 506, then oil pipe is cut It finishes.

It is resetted for ease of internal cutter 505, further, as shown in Figure 1,101 top of hydraulic cylinder is equipped with upper end cover 106, Upper end cover 106 is run through in the upper end 107 of feed piston, and the lower end side wall of hydraulic cylinder 101 is equipped with reversed pressurizing port 108, instead It is connected to pressurizing port 108 with the inside of hydraulic cylinder 101.Setting upper end cover 106 can skid off hydraulic pressure to avoid feed piston 102 Cylinder body 101, to ensure the reliability of the work of hydraulic feed mechanism 1.By the connection hydraulic hand-pump 6 of hydraulic line 601 and instead To pressurizing port 108, then hydraulic oil can be pumped into hydraulic cylinder 101, push feed piston 102 to move up, to make reset Spring 503 discharges compressive state, and knife mandril 504 is pulled out to move up, to reset internal cutter 505.Due to hand-hydraulic It is respectively connected with hydraulic line 601 between pump 6 and positive pressurizing port 103, reversed pressurizing port 108, therefore can be in two hydraulic lines Hydraulic valve is respectively set on 601, suppresses and reversely suppresses to switch forward direction by adjusting the state of hydraulic valve.

Optionally, it is provided with size scale line on the upper end 107 of feed piston, it, can be with by reference to size scale line Know the location of feed piston 102, thus can be used for judging whether hydraulic feed mechanism 1 reaches maximum access site, with And whether restore initial position, it realizes accurately controlling for oil pipe cutting, improves the working efficiency of equipment.

Further to accurately control the running orbit of internal cutter 505, stability, safety in guarantee oil pipe cutting process And high efficiency, as shown in figure 4, cutter guiding axis 501 is internally provided with slide-bar 507, the upper end of internal cutter 505 is provided with leads with cutter The sliding slot 5051 parallel to axis 501, slide-bar 507 are located in sliding slot 5051, and the lower face of cutter mounting hole 506 tilts down The lower face of wedge structure, cutter mounting hole 506 is matched with 505 bottom shape of internal cutter.

506 lower face of cutter mounting hole of cutter guiding axis 501 is the wedge structure tilted down, when feed mandril 105 Lower extrusion knife mandril 504, when using the pushing internal cutter 505 of knife mandril 504, the upper end of internal cutter 505 is in slide-bar 507 and sliding slot Vertical downward movement is done under 5051 limitation, the point of a knife of internal cutter 505 can be close to wedge-shaped end face, and be transported obliquely along wedge-shaped end face Dynamic, progressive to lean out point of a knife, this mode can be limited and be positioned to the knife track that goes out of internal cutter 505, ensure the fast of knife Speed and stability.Start hydraulic motor 203 simultaneously, hollow spindle 202 drives cutter guiding axis 501, internal cutter 505 to do circumference Rotary motion starts to cut oil pipe when point of a knife contacts oil pipe tube wall, after cutting, reversely suppresses hydraulic feed mechanism 1, into Knife mandril 105 reset, while go out knife mandril 504, internal cutter 505 restores initial position under the action of resetting spring 503.

The bottom end of cutter guiding axis 501 is connected with centralizer 508, and centralizer 508 is internally provided with deep groove ball bearing 509.It helps Positive device 508 can ensure that the hydraulic-driven well mouth oil pipe cutter is in honest state, and centralizer 508 is internally provided with deep-groove ball axis 509 are held, makes the uniform force in radial cuts of internal cutter 505, ensures the stability of total.

The present embodiment provides one kind to be suitble to be fixed on the vertical valve of well head, cutting suspension with pressure and stuck oil pipe column A kind of hydraulic-driven, the oil pipe internal cutting equipment of feed, its working principle is that：Hydraulic oil enters through positive pressurizing port, pushes Feed piston, feed piston compression reseting spring simultaneously drive feed mandril to move down, and then push internal cutter by going out knife mandril Point of a knife is leant out, meanwhile, hydraulic drive mechanism drives gear drive to operate by hydraulic motor, makes main shaft that cutter be driven to be oriented to Shaft rotation is dynamic so that internal cutter rotation cutting oil pipe makes feed mandril move up, then in the effect of resetting spring after oil pipe cut-out Under, internal cutter is repositioned to again in the cutter mounting hole of cutter guiding axis, then oil pipe cutting process finishes.The application passes through hydraulic pressure The effect of power source, you can realize the automatic cutting of oil pipe, operating process is simple and reliable, can effectively improve the operation of well-repairing work Efficiency, and it is safe to use, it is used not only in the workover treatment of the oil wells such as high-solidifiability oil well, plain tubing is stuck can also to pass through this Shen Technical solution please repairs operation.

Embodiment two

Described in previous embodiment one on the basis of structure, hydraulic-driven well mouth oil pipe cutter provided in this embodiment, also Further comprise cutter position adjusting mechanism 3 and well control mechanism 4, the concrete structure of both mechanisms is described more fully below：

As shown in figure 5, cutter position adjusting mechanism 3 includes rotation deck 301, internal thread pedestal 302 and retaining spline ring 303, rotation deck 301 is sheathed on the outside of hollow spindle 202, and internal thread pedestal 302 is sheathed on the outside of rotation deck 301, Internal thread pedestal 302 is threadedly coupled with rotation deck 301, and internal thread pedestal 302 is fixed on 201 bottom of babinet, retaining spline ring 303 are fixed on outside rotation deck 301.

Rotation deck 301 can by a pair of of clip by bolt embrace be sandwiched in head valve interface, between sealed by ring gasket, Cutting equipment is set safely and reliably to be fixed on construction well head.

Internal thread pedestal 302 can be fixed on 201 bottom of babinet by four bolts, and seam allowance boss 306 is for limiting lower axle Hold 207 outer shroud of angular contact ball bearing in mounting hole 206.The external screw thread of the internal thread of internal thread pedestal 302 and rotation deck 301 Connection, by turn rotation deck 301, the difference in height between the lower face and babinet 201 of adjustable rotating deck 301, to The cutting position of adjustment internal cutter 505 meets well head design position indirectly, then sharp after the position of internal cutter 505 regulates It is locked by soket head cap screw 305 with retaining spline ring 303, soket head cap screw 305 plays the role of jackscrew, thus by revotating card The position of seat 301 is fixed.

Optionally, it is equipped with copper sheathing 304 between the upper end inner wall and hollow spindle 202 of rotation deck 301.By in revotating card Seat 301 upper end inner wall and hollow spindle 202 between be equipped with copper sheathing 304, can reduce rotation deck 301 in turn with it is hollow Friction between main shaft 202 reduces the generated heat of friction between equipment to ensure the running efficiency of hollow spindle 202 And abrasion.It is provided with sealing ring between the lower end and hollow spindle 202 of rotation deck 301, for example can be arranged up and down two " O " Type sealing ring enables design standard to reach highest pressure to realize that rotation deck 301 and the sealing of hollow spindle 202 are socketed 21 megapascal.

With reference to Fig. 4, well control mechanism 4 includes steel ball 401, and steel ball 401 is located at the lower section of feed mandril 105, and steel ball 401 is located at Go out between knife mandril 504 and the tapered end face 2021 of hollow spindle, the diameter of steel ball 401 is more than the tapered end face of hollow spindle 2021 diameter.

The lower face of hollow spindle 202 is inner conical structure, and 401 top of steel ball is the tapered end face 2021 of hollow spindle, And the diameter of steel ball 401 is more than the diameter of the tapered end face 2021 of hollow spindle, thus 404 top of steel ball is by the cone of hollow spindle Shape end face 2021 is blocked, and steel ball 401 can only be pushed by feed mandril 105, be moved down, and then pushes 401 lower section of steel ball Go out knife mandril 504 to move down, while compression reseting spring 502, that completes internal cutter 505 goes out knife and time knife reseting procedure.

In Fig. 1, rotation 301 part-structure below of deck is respectively positioned in well.Since steel ball 401 can only move downward and It cannot move upwards, therefore, steel ball 401 plays the role of being equivalent to check valve, i.e., the fluids such as any liquid, gas can only be downward Unidirectionally pass through, its role is to when equipment is cutting oil pipe, if occurring high pressure in well suddenly, pressure can push steel ball The 401 close tapered end faces 2021 for being affixed on hollow spindle, liquid can not on gush, to effectively avoid because pressure increases in sudden well Gas blowout accident caused by big.

Meanwhile in other modes of operation in the cards, can integrally dismantle hydraulic feed mechanism 1, extract feed top Kill line is connected through a screw thread the upper end for being fixed on hollow spindle 202 by bar 105, at this point, hollow spindle 202 is equivalent to control In well processed when high pressure well killing fluid flow channel, with pump truck by well killing fluid through kill line injection hollow spindle 202 in, well killing fluid Channel out of hollow spindle 202 flows downward, and steel ball 401 is pushed to move downward, then kill-job in hollow spindle 202 and Fig. 4 The channel 7 of liquid is connected, and to inject into well well killing fluid, implements kill-job operation, to balance borehole pressure.Work as pressure balance Afterwards, then hydraulic feed mechanism 1 is reinstalled, then starting device, continues to complete oil pipe cutting work in the manner aforesaid.As it can be seen that The technical solution of the present embodiment can effectively prevent gas blowout accident, and borehole pressure is maintained to balance while carrying out oil pipe cutting, Improve the safety of oil pipe cutting process.

Hydraulic-driven well mouth oil pipe cutter provided in this embodiment can effectively solve the well puller of oil pipe column stuck early period Make, first, which uses hydraulic-driven and hydraulic feed, self-powered source, and well head is made to be brought far from factors such as electricity, fire Security risk；Secondly, equipment includes cutter position adjusting mechanism, to make cutting position meet well head design requirement, operability It is stronger with practicability；Again, equipment is also devised with well control mechanism, and the pressure in well can be effectively controlled in work progress, maintains Well inner equilibrium, prevents gas blowout accident.The application can realize the automatic cutting of oil pipe, and operating process is simple and reliable, can be effective The operating efficiency of well-repairing work is improved, and safe to use, is used not only in the workover treatment of the oil wells such as high-solidifiability oil well, conventional oil Pipe clamp extremely also can repair operation by the technical solution of the application.

In the associated description of the application, it should be noted that the fingers such as term " centre ", "upper", "lower", "inner", "outside" The orientation or positional relationship shown be based on the orientation or positional relationship shown in the drawings or the product using when usually put Orientation or positional relationship, be merely for convenience of description the application and simplify describe, do not indicate or imply the indicated device or Element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as the limitation to the application.

It should also be noted that, unless otherwise clearly defined and limited, term " setting ", " connection ", " placement " should be done It broadly understood, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；Can be mechanical connection, It can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary inside two elements Connection.For the ordinary skill in the art, it can understand that above-mentioned term in this application specific contains with concrete condition Justice.

Those skilled in the art will readily occur to the application after considering specification and putting into practice utility model disclosed herein Other embodiments.This application is intended to cover any variations, uses, or adaptations of the utility model, these changes Type, purposes or adaptive change follow the general principle of the utility model and include the undocumented this technology of the utility model Common knowledge in field or conventional techniques.The description and examples are only to be considered as illustrative, the real model of the application It encloses and spirit is pointed out by the attached claims.

It should be understood that the application is not limited to the precision architecture for being described above and being shown in the accompanying drawings, and And various modifications and changes may be made without departing from the scope thereof.Scope of the present application is only limited by the accompanying claims.

Claims (10)

1. a kind of hydraulic-driven well mouth oil pipe cutter, which is characterized in that include from top to bottom hydraulic feed mechanism (1), liquid successively It includes hydraulic cylinder (101) and feed piston to press driving mechanism (2) and cutter knife mechanism (5), the hydraulic feed mechanism (1) (102), positive pressurizing port (103) is equipped in the feed piston (102), the lower end (104) of feed piston is connected with feed Mandril (105)；

The hydraulic drive mechanism (2) includes babinet (201), hollow spindle (202), hydraulic motor (203) and is located at the case The internal gear drive (204) of body (201), the hollow spindle (202) are sheathed on the outside of feed mandril (105), institute State hollow spindle (202) run through babinet (201), the gear drive (204) respectively with hollow spindle (202) and hydraulic pressure horse It is connected up to (203)；

The cutter knife mechanism (5) includes cutter guiding axis (501), nut set (502), resetting spring (503), goes out knife mandril (504) it is connect with the bottom end of hollow spindle (202) with internal cutter (505), the cutter guiding axis (501), the nut set (502) it is connect with the threaded upper ends for going out knife mandril (504), the cutter guiding axis (501) is sheathed on nut set (502), resets Spring (503) and the outside for going out knife mandril (504), the resetting spring (503) are located at cutter guiding axis (501) and go out knife mandril (504) between, described resetting spring (503) one end is connect with the bottom of nut set (502), the resetting spring (503) it is another One end is connect with knife mandril (504) is gone out, it is described go out knife mandril (504) below be equipped with cutter mounting hole (506), the internal cutter (505) it is set in cutter mounting hole (506).

2. hydraulic-driven well mouth oil pipe cutter according to claim 1, which is characterized in that the hydraulic-driven well mouth oil pipe Cutter further includes cutter position adjusting mechanism (3), and the cutter position adjusting mechanism (3) includes rotation deck (301), internal thread Pedestal (302) and retaining spline ring (303), the rotation deck (301) is sheathed on the outside of hollow spindle (202), described interior Threaded base (302) is sheathed on the outside of rotation deck (301), the internal thread pedestal (302) and rotation deck (301) screw thread Connection, the internal thread pedestal (302) are fixed on babinet (201) bottom, and the retaining spline ring (303) is fixed on rotation deck (301) external.

3. hydraulic-driven well mouth oil pipe cutter according to claim 1 or 2, which is characterized in that the hydraulic-driven well head Tubing cutter further includes well control mechanism (4), and the well control mechanism (4) includes steel ball (401), and the steel ball (401) is located at feed The lower section of mandril (105), the steel ball (401) are located between knife mandril (504) and the tapered end face (2021) of hollow spindle, The diameter of the steel ball (401) is more than the diameter of the tapered end face (2021) of the hollow spindle.

4. hydraulic-driven well mouth oil pipe cutter according to claim 1, which is characterized in that the cutter guiding axis (501) It is internally provided with slide-bar (507), the upper end of the internal cutter (505) is provided with the sliding slot parallel with cutter guiding axis (501) (5051), the slide-bar (507) is located in sliding slot (5051), and the lower face of the cutter mounting hole (506) tilts down The lower face of wedge structure, the cutter mounting hole (506) is matched with the internal cutter (505) bottom shape.

5. hydraulic-driven well mouth oil pipe cutter according to claim 1 or 4, which is characterized in that the cutter guiding axis (501) bottom end is connected with centralizer (508), and the centralizer (508) is internally provided with deep groove ball bearing (509).

6. hydraulic-driven well mouth oil pipe cutter according to claim 1, which is characterized in that the hollow spindle (202) two Side is arranged with upper bearing (metal) mounting hole (205), and the upper bearing (metal) mounting hole (205) is located at the top of babinet (201), described hollow Main shaft (202) both sides are also arranged with lower bearing mounting hole (206), and the lower bearing mounting hole (206) is located at babinet (201) It is equipped with angular contact ball bearing (207), the angle in bottom, the upper bearing (metal) mounting hole (205) and lower bearing mounting hole (206) Contact ball bearing (207) is fixed on babinet (201) by fastening assembly (208), and the fastening assembly (208) includes floor clip (2081) and round nut (2082), the upper bearing (metal) mounting hole (205) are fixedly arranged above bearing gland (209).

7. hydraulic-driven well mouth oil pipe cutter according to claim 2, which is characterized in that the rotation deck (301) Copper sheathing (304) is equipped between upper end inner wall and the hollow spindle (202).

8. hydraulic-driven well mouth oil pipe cutter according to claim 1, which is characterized in that hydraulic cylinder (101) top End is equipped with upper end cover (106), and the upper end (107) of feed piston is under upper end cover (106), the hydraulic cylinder (101) End sidewalls are equipped with reversed pressurizing port (108), and the reversed pressurizing port (108) is connected with the inside of the hydraulic cylinder (101) It is logical.

9. hydraulic-driven well mouth oil pipe cutter according to claim 1, which is characterized in that the gear drive (204) include main drive gear (210) and driven gear (211), the driven gear (211) connect with hollow spindle (202), The main drive gear (210) is connect with the main shaft (212) of hydraulic motor by gear gland (213), the main drive gear (210) it is meshed with driven gear (211), the transmission ratio of the gear drive (204) is 4：1.

10. hydraulic-driven well mouth oil pipe cutter according to claim 1, which is characterized in that the upper end of the feed piston Portion is provided with size scale line on (107).