CN213980728U

CN213980728U - Pen point milling cone

Info

Publication number: CN213980728U
Application number: CN202022467505.2U
Authority: CN
Inventors: 张建党; 游静; 杨金明; 张涵; 王伟红; 杨伟; 付朝乙; 郭瑞峰
Original assignee: Sinopec Oilfield Service Corp; Sinopec North China Petroleum Engineering Corp
Current assignee: Sinopec Oilfield Service Corp; Sinopec North China Petroleum Engineering Corp
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-08-17
Anticipated expiration: 2030-10-30

Abstract

The utility model provides a pen point mills awl, include: the transmission shaft sequentially comprises an upper joint, a square shaft and a round shaft from top to bottom, and a through center hole is formed in the transmission shaft; the milling cone is sleeved outside the transmission shaft and positioned below the upper joint, a square hole is formed in the milling cone, the milling cone can slide up and down along the transmission shaft, the milling cone is provided with a rotation stopping station which is positioned at an upper position and enables the square hole and the square shaft to be in rotation stopping fit, and the milling cone is also provided with an idle station which is positioned at a lower position and enables the milling cone to idle relative to the round shaft; the guide nib, fixed connection is equipped with the through-hole with the centre bore intercommunication in the guide nib at the transmission shaft lower extreme, and the guide nib has the oblique cutting guide face, and the oblique cutting guide face is used for guiding nib milling cone to get into eccentric broken casing intraorally, and the longitudinal section shape of guide nib is right trapezoid, and right trapezoid's oblique waist belongs to the partly of guide inclined plane. The utility model discloses a set up the guide nib, can make the instrument get into the broken casing mouth, realize grinding and milling the passageway to the sleeve pipe of big displacement broken by mistake.

Description

Pen point milling cone

Technical Field

The utility model relates to an oil field cover decreases well and beats passageway instrument technical field, concretely relates to pen point mills awl.

Background

In the later development stage of the oil field, casing damage wells are increased day by day due to various factors, and the increase, storage and stable yield of the oil field are seriously limited. At present, the types of casing damage mainly comprise corrosion, perforation, fracture, single-side and multi-side deformation reducing, bending deformation, casing dislocation and the like, and for wells with small casing drift diameter after dislocation, the construction difficulty of casing tunneling in major repair operation is high, the construction period is long, and the success rate of tunneling repair is low.

Chinese utility model patent with publication number CN201810246U discloses a movable milling shoe, which comprises a transmission shaft, a cone-shaped milling shoe and a guide rod, wherein the transmission shaft is provided with a chip removal hole, and the axis of the chip removal hole coincides with the axis of the transmission shaft. The transmission shaft sequentially comprises a connecting sleeve head, an outer hexagonal conical shaft and a connecting shaft from top to bottom, the connecting sleeve head is used for being connected with a drill string entering a well, the cross section of the outer hexagonal conical shaft is in a regular hexagon, and the lower end of the connecting shaft is connected with the upper end of the guide rod. The cone-shaped grinding shoe is sleeved on the connecting shaft and comprises a cone-shaped sleeve grinding wheel and a circular truncated cone-shaped sleeve, the cone-shaped sleeve grinding wheel is fixedly sleeved on the circular truncated cone-shaped sleeve, and the outer hexagonal cone-shaped shaft is inserted in the circular truncated cone-shaped sleeve. When the device is used, the conical grinding shoes cannot move or rotate along with a tool at the connecting shaft on the lower part of the transmission shaft when the device drills down, the grinding shoes are pushed to the outer hexagonal conical shaft for grinding and milling only after the lower part of the grinding shoes is inserted into the lower port, if the grinding shoes are inserted into a stratum outside a sleeve, the grinding shoes cannot be pushed to the hexagonal conical body, the grinding and milling effect cannot be generated, and the phenomenon that the sleeve is lost, mistakenly ground and milled out of the sleeve is effectively prevented.

Although above-mentioned activity junk mill can be to meeting the processing that hinders well section sleeve pipe deformation, sleeve pipe small displacement dislocation, and the mill is beaten the passageway and has certain effect, nevertheless to the big displacement dislocation of sleeve pipe, when the dislocation casing mouth is eccentric great promptly, because of this activity junk mill's guide rod is cylindric, so the guide rod can't introduce the dislocation casing mouth, leads to the sleeve pipe to repair the cover and beats the passageway failure.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can grind the nib milling awl of milling the passageway to the sleeve pipe of big displacement fault-break.

In order to achieve the above object, the utility model provides a nib mills awl adopts following technical scheme:

a pen-tip milling cone comprising:

the transmission shaft is defined that the axis of the transmission shaft extends along the vertical direction and sequentially comprises an upper joint, a square shaft and a round shaft from top to bottom, and a vertically through center hole is formed in the transmission shaft;

the milling cone is sleeved outside the transmission shaft and positioned below the upper joint, a square hole is formed in the milling cone, the milling cone can slide up and down along the transmission shaft, the milling cone is provided with a rotation stopping station which is positioned at an upper position and enables the square hole and the square shaft to be matched in a rotation stopping mode, and the milling cone is also provided with an idle station which is positioned at a lower position and enables the milling cone to idle relative to the round shaft;

the nib mills awl still includes:

the guide pen point is fixedly connected to the lower end of the transmission shaft, a through hole communicated with the central hole is formed in the guide pen point, a stop surface matched with the milling cone in a stop mode to stop the milling cone from going downwards is formed in the upper end face of the guide pen point, the guide pen point is further provided with a beveling guide surface, the beveling guide surface is used for guiding the milling cone of the pen point to enter the eccentric broken casing pipe, the longitudinal section of the guide pen point is in a right trapezoid shape, and the oblique waist of the right trapezoid belongs to one part of the guide inclined surface.

The beneficial effects of the above technical scheme are that: because the lower extreme fixedly connected with of transmission shaft guides the nib, guides the nib to have the oblique cutting guide face for the longitudinal section shape of guide nib is right trapezoid, and right trapezoid's oblique waist belongs to the partly of guide inclined plane, and the slant span of oblique cutting guide face is bigger, can guide the nib to mill the awl and get into the casing mouth of eccentric fault, realizes milling the passageway to the casing of big displacement fault.

Furthermore, in order to achieve better milling effect, the milling cone comprises a milling cone base body and a spiral milling belt fixed on the outer surface of the milling cone base body.

Furthermore, in order to facilitate the discharge of the milling chips, at least two spiral milling belts are provided, and a chip discharge groove for discharging the milling chips is formed between every two adjacent spiral milling belts.

Furthermore, in order to realize the grinding and milling and the expanding milling of the broken sleeve channel, the lower part of the milling cone is conical, and the upper part of the milling cone is columnar.

Furthermore, in order to facilitate the processing of the square shaft and the square hole, the outer surface of the square shaft is a straight surface extending up and down, and the inner hole wall of the square hole is a straight wall extending up and down.

Furthermore, in order to facilitate the rotation stopping fit between the square shaft and the square hole, the cross sections of the square shaft and the square hole are both in a regular hexagon shape.

Furthermore, in order to facilitate the machining and manufacturing of the milling cone, the square hole penetrates through the whole milling cone along the vertical direction.

Furthermore, in order to enable the round shaft to limit the transverse movement of the milling cone, the round shaft is internally tangent to the hole wall of the square hole.

Furthermore, in order to facilitate the disassembly and assembly between the guide pen point and the transmission shaft, the transmission shaft further comprises an external thread section positioned below the circular shaft, and the guide pen point is in threaded connection with the external thread section.

Furthermore, the outer diameter of the guide pen point is reduced to facilitate the installation of the guide pen point, the milling operation of the milling cone is facilitated to the maximum extent, the outer diameter of the external thread section is smaller than that of the round shaft, so that a step surface is formed between the external thread section and the round shaft, and the upper end of the guide pen point abuts against the step surface.

Drawings

FIG. 1 is a schematic view of a pen point milling cone according to the present invention;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

fig. 3 is a sectional view taken along line B-B in fig. 1.

In the figure:

1-a transmission shaft; 11-upper joint; 12-square shaft; 13-round shaft; 14-external thread section; 15-a central hole;

2, milling a cone; 21-milling a cone base body; 22-helical milling of the strip; 23-chip groove; 24-square holes;

3-guiding the pen point; 31-chamfered guide surfaces; 32-through holes.

Detailed Description

The technical solutions of the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.

In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless explicitly stated or limited otherwise; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.

The utility model discloses an embodiment of well nib milling cone is shown in fig. 1, including transmission shaft 1, milling cone 2, guide nib 3.

The axis of the transmission shaft 1 extends along the up-down direction, and the transmission shaft 1 comprises an upper joint 11, a square shaft 12, a round shaft 13 and an external thread section 14 from top to bottom. Wherein, the upper joint 11 is used for connecting with the drill string entering the well, the outer surface of the square shaft 12 is a straight surface extending up and down, as shown in fig. 2, the cross section of the square shaft 12 is in a regular hexagon shape.

Referring to fig. 1 and 3, the milling cone 2 is sleeved outside the transmission shaft 1 and located below the upper joint 11, a square hole 24 penetrating through the whole milling cone along the up-down direction is formed in the milling cone 2, the inner hole wall of the square hole 24 is a straight wall extending up and down, and the cross section of the square hole 24 is in a regular hexagon shape.

The milling cone 2 can slide up and down along the square shaft 12 and the round shaft 13, and the milling cone 2 is provided with a rotation stopping station which is positioned at the upper position and enables the square hole 24 to be matched with the square shaft 12 in a rotation stopping way, so that the transmission of torque during milling is realized. The milling cone 2 also has an idle working position (in fig. 1, the idle working position) which is at a lower position and enables the milling cone to idle relative to the circular shaft 13, and at the time, zero torque is transmitted, so that milling operation cannot be carried out, and the protection of the sleeve is realized. In order to facilitate the milling cone 2 to be switched from the idle operation station to the rotation stopping station, a chamfer is arranged at the upper end hole opening of the square hole 24.

In the present embodiment, the circular shaft 13 is inscribed in the hole wall of the square hole 24, so that the milling cone 2 can be prevented from moving transversely, that is, the cross-sectional circle of the circular shaft 13 is the inscribed circle of the square hole 24.

Referring to fig. 1, 2 and 3, a vertically through center hole 15 is formed in the transmission shaft 1 to realize circulation of the working workover fluid. The lower part of the milling cone 2 is in a cone shape, and the broken sleeve channel is subjected to grinding, milling and repairing; the upper part is columnar, and the final expanding and milling of the sleeve passage are realized. The main body of the milling cone 2 is a milling cone base body 21, the square hole 24 is formed in the middle of the milling cone base body 21, the milling cone 2 further comprises a hard alloy spiral milling belt 22 welded and fixed on the outer surface of the milling cone base body 21, and the spiral milling belt 22 is a milling main body and can achieve smooth, continuous and efficient milling and repairing of a casing without blind spots. And, the spiral mills the area 22 to have many, form the chip groove 23 for milling the chip discharge between two adjacent spiral mills area 22, chip groove 23 and central hole 15 form the channel that the operation workover fluid of milling circulates together, guarantee the back discharge of the chip of milling.

As shown in fig. 1, the upper portion of the guide pen tip 3 is screwed onto the male screw section 14, and the male screw section 14 has an outer diameter smaller than that of the circular shaft 13 so that a step surface is formed between the male screw section 14 and the circular shaft 13, and the upper end of the guide pen tip 3 abuts against the step surface. Meanwhile, the upper end surface of the guide nib 3 forms a stopper surface which is in stopper-fit with the milling cone 2 to prevent the milling cone 2 from descending. And the upper joint 11 can limit the upward limit of the milling cone 2, so that the milling cone 2 is limited on the transmission shaft 1.

The through hole 32 communicated with the central hole 15 is formed in the guide pen point 3, namely the guide pen point 3 is of a hollow structure, so that the fish head can be effectively washed, and efficient milling is ensured.

The guide nib 3 is used to guide the nib burr into the eccentrically broken casing opening and quickly find the casing damage passage, so that the guide nib 3 has a chamfered guide surface 31, so that the longitudinal cross-sectional shape of the guide nib 3 is a right-angled trapezoid, the oblique waist of which belongs to a part of the guide slope 32. In the present embodiment, the guide pen tip 3 is machined from a circular tube, and therefore the outer contour shape of the chamfered guide surface 31 is an ellipse.

The utility model discloses well nib mills the theory of operation of awl is:

when the pen point is used for milling the cone, the upper joint 11 is connected with a drill string entering a well, the tool is placed into the well, and when the drill string is placed to be 2m above the casing loss, the pump is started to circulate and flushAnd (5) washing the fish top. The drilling tool is lowered at low rotation speed and low bit pressure, after the tool contacts the top of the fish, the rotation speed and bit pressure are gradually increased until the ideal drilling speed is obtained, the square drill rod is marked, the bit pressure is controlled to be 10-30KN and the discharge is controlled to be 0.3-0.5m during the general milling operation³The speed is controlled at 50-80 r/min. When the tool reaches the fracture surface fault depth, the fracture surface fault is found by repeatedly carrying out 'lifting a drilling tool, rotating the angle and lowering the drilling tool' in sequence. If the lower end of the tool guides the pen point 3 to be smoothly led into the broken casing opening in the well, the casing damage iron sheet pushes the milling cone 2 of the tool to ascend from the round shaft 13 at the lower part of the transmission shaft 1 and enter the square shaft 12 at the upper part of the transmission shaft 1, the milling cone 2 moves to a rotation stopping station, the drilling tool is continuously rotated to repair the casing, and the casing can be slowly repaired to finish reaming under the conditions of torque and footage. If the guide pen point 3 can not smoothly enter the sleeve damage fault fracture, the milling cone 2 of the tool is always positioned at the round shaft 13 at the lower part of the transmission shaft 1, the milling cone 2 is positioned at an idle working position, the milling cone 2 is not moved when the drilling tool is rotated, a footless state is achieved, window opening accidents are prevented, and sleeve protection is achieved. If no footage exists, the operations of 'lifting a drilling tool, rotating the angle and lowering the drilling tool' are repeated again, and the wrong fracture is found until the lower end of the tool guides the pen point 3 to be led into the wrong casing opening in the well, so that the completion of repairing the casing and opening the passage is completed.

In other embodiments of the pen-tip milling cone, the outer diameter of the external threaded section may be equal to the outer diameter of the circular shaft.

In other embodiments of the nib-milling cone, the transmission shaft does not include an external thread section and is composed of an upper joint, a square shaft and a round shaft, and the guide nib can be welded and fixed at the lower end of the round shaft or sleeved outside the round shaft and then fixed by using a screw.

In other embodiments of the pen tip milling cone, the outer diameter of the round shaft may be smaller than the diameter of the inscribed circle of the square hole, with a gap between the round shaft and the square hole.

In other embodiments of nib milling cone, the square hole does not link up whole milling cone, and the square hole only has one section, still is provided with the round hole in the milling cone this moment, and the round hole is located the below of square hole, and the round hole cooperates with the guiding of circle axle.

In other embodiments of the nib burr, the cross-sectional shape of the square shaft and the square hole may also be square.

In other embodiments of the pen tip milling cone, the outer surface of the square shaft may not be a straight surface extending up and down, but a tapered surface, and the inner hole wall of the square hole may not be a straight wall extending up and down, but a tapered wall.

In other embodiments of the pen tip milling cone, the milling cone may be cylindrical as a whole or conical as a whole.

In other embodiments of the pen point milling cone, only one spiral milling belt can be provided, and at the moment, no chip discharge groove is formed, and milling chips directly fall into the well bottom.

In other embodiments of the pen-tip milling cone, the spiral milling belt can be replaced by a straight milling belt, or a milling belt is not arranged, and a circle of milling layers are arranged on the outer surface of the milling cone base body.

In another embodiment of the pen tip milling cone, the guide pen tip may be formed by machining a square tube, and in this case, the outer contour of the chamfered guide surface is rectangular.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. A pen-tip milling cone comprising:

its characterized in that, nib mills awl still includes:

2. The pen-tip milling cone of claim 1, wherein the milling cone comprises a milling cone base and a helical milling band secured to an outer surface of the milling cone base.

3. The pen-tip milling cone of claim 2, wherein the helical milling band has at least two helical milling bands, and a flute for discharging milling chips is formed between two adjacent helical milling bands.

4. The pen tip milling cone according to any one of claims 1 to 3, wherein the milling cone has a conical lower part and a cylindrical upper part.

5. The pen tip milling cone according to any one of claims 1 to 3, wherein the outer surface of the square shaft is a straight surface extending up and down, and the inner hole wall of the square hole is a straight wall extending up and down.

6. The pen tip milling cone according to any one of claims 1 to 3, wherein the cross-sectional shapes of the square shaft and the square hole are both regular hexagons.

7. The pen-tip milling cone according to any one of claims 1 to 3, wherein the square hole penetrates the entire milling cone in the vertical direction.

8. The pen tip milling cone according to any one of claims 1 to 3, wherein the circular axis is inscribed in the wall of the square hole.

9. The pen-tip milling cone according to any one of claims 1 to 3, wherein the drive shaft further comprises an external threaded section below the circular shaft, and the guide pen-tip is screwed on the external threaded section.

10. The pen-tip milling cone of claim 9, wherein the outer diameter of the external threaded section is smaller than the outer diameter of the circular shaft so that a step surface is formed between the external threaded section and the circular shaft, and the upper end of the pen-tip is guided to abut against the step surface.