CN113898309A - Spiral wing collarband mill shoe - Google Patents

Abstract

The invention provides a spiral wing pilot mill shoe, wherein a guide head, a body part and a joint part all adopt hollow structures, the interior of the guide head, the interior of the body part and the interior of the joint part are communicated to form a hollow cavity, the body part comprises a bench grinding part and a column grinding part, the bench grinding part adopts a circular table type structure, the column grinding part adopts a cylindrical structure, the tail end of the bench grinding part is fixedly connected with the head end of the column grinding part, grinding belts for grinding underground objects are uniformly arranged on the outer walls of the table grinding part and the column grinding part, the grinding belts are spirally distributed on the outer walls of the table grinding part and the column grinding part, a diversion trench for leading out water flow is arranged between adjacent grinding belts, the tail end of the guide head is fixedly connected with the head end of the table grinding part, the head end of the guide head is uniformly provided with water holes for communicating the hollow cavity with the outside of the mill shoe, and the tail end of the column mill part is fixedly provided with a joint part for connecting with a drilling tool. The milling shoe can improve the efficiency of milling operation for underground tubular objects and shorten the operation time.

Description

Spiral wing collarband mill shoe

Technical Field

The invention relates to the technical field of underground tool equipment in oil and gas engineering, in particular to a spiral wing pilot hole milling shoe.

Background

In the drilling or workover operation of oil gas well, often meet the condition such as milling sleeve pipe, tubular column fracture or drop in the pit, under the unable condition of salvaging or unable direct salvage, need mill the underground object. In the underground object needing to be milled, due to the particularity of tubular and hollow shapes, the guide eye milling shoe with pertinence is used, and the milling efficiency can be improved. The prior commonly used grinding shoe has the disadvantages of poor centering performance, low abrasive dust back-discharge efficiency, low milling efficiency and the like.

Disclosure of Invention

The invention overcomes the defects in the prior art, and the problems of poor centering performance, low abrasive dust return efficiency and low milling efficiency of the conventional milling shoe, and provides the spiral wing pilot hole milling shoe which can improve the milling operation efficiency of underground tubular objects and shorten the operation time.

The purpose of the invention is realized by the following technical scheme.

A spiral wing pilot mill shoe comprises a guide head, a body part and a joint part, wherein the guide head, the body part and the joint part are all of a hollow structure, the interior of the guide head, the interior of the body part and the interior of the joint part are communicated to form a hollow cavity, the body part comprises a bench mill part and a column mill part, the bench mill part is of a circular table structure, the column mill part is of a cylindrical structure, the tail end of the bench mill part is fixedly connected with the head end of the column mill part, grinding belts for grinding underground objects are uniformly arranged on the outer walls of the bench mill part and the column mill part, the grinding belts are spirally distributed on the outer walls of the bench mill part and the column mill part, a diversion trench for guiding water flow is arranged between adjacent grinding belts, the tail end of the guide head is fixedly connected with the head end of the bench mill part, the head end of the guide head is uniformly provided with water holes for communicating the hollow cavity with the outside of the mill shoe, and the tail end of the column mill part is fixedly provided with the joint part for connecting with a drilling tool.

The water hole adopts a central single water hole structure, a plurality of equidistantly distributed water hole structures surrounding the center or a structure with a plurality of equidistantly distributed water holes surrounding the center.

The included angle between the grinding belt and the central axis of the body part is 20-45 degrees.

The included angle between the grinding belt and the central axis of the body part is 30 degrees.

And the inner wall of the joint part is provided with an internal thread matched with the external thread of the drilling tool.

The grinding belt is made of hard alloy particles.

The diameter of the tail end of the bench grinding part is equal to that of the head end of the column grinding part.

The diameter of the tail end of the cylindrical grinding part is larger than that of the head end of the joint part.

And a reducing section is formed between the tail end of the cylindrical grinding part and the head end of the joint part, and the reducing section adopts a conical transition structure.

The profile line of the longitudinal section of the head end of the guide head is semicircular or parabolic, and the middle rear part of the guide head is cylindrical.

The invention has the beneficial effects that: the milling shoe is suitable for milling underground tubular column objects, is connected with the milling shoe by using a proper drilling tool, is sent into the underground by using the drilling tool, slows down the lowering speed when the front end of the milling shoe is judged to be close to the underground objects, and ensures that the guide head of the milling shoe is smoothly inserted into the underground tubular objects and is not damaged; the bench grinding part can adapt to objects with various sizes and diameters in the well, and can grind the objects in the well by applying torque to the grinding shoe to enable the grinding shoe to rotate circumferentially; inside the hydrophthalmia that has fluid to pass through the guide head front end of this junk mill flows, and the piece after platform grinds the portion and grinds returns to the annular space between post mill portion and the pit shaft inner wall along with rivers, is ground into more tiny piece by rotatory post mill portion once more, and the piece continues upwards to return along the guiding gutter along rivers until discharging from the well head.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic perspective sectional view of the present invention;

in the figure: 1 is the guide head, 2 is the water hole, 3 is the platform portion of grinding, 4 is the post portion of grinding, 5 is the joint portion, 6 is the abrasive band, 7 is the guiding gutter, 8 is the cavity, 9 is the internal thread.

For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.

Detailed Description

The technical solution of the present invention is further illustrated by the following specific examples.

Example one

A spiral wing pilot grinding shoe comprises a guide head 1, a body part and a joint part 5, wherein the guide head 1, the body part and the joint part 5 are all of a hollow structure, the interior of the guide head 1, the interior of the body part and the interior of the joint part 5 are communicated to form ahollow cavity 8, the body part comprises atable grinding part 3 and a column grinding part 4, thetable grinding part 3 is of a circular table structure, the column grinding part 4 is of a cylindrical structure, the tail end of thetable grinding part 3 is fixedly connected with the head end of the column grinding part 4, grinding belts 6 for grinding underground objects are uniformly arranged on the outer walls of thetable grinding part 3 and the column grinding part 4, the grinding belts 6 are spirally distributed on the outer walls of thetable grinding part 3 and the column grinding part 4, a diversion trench 7 for guiding water flow is arranged between adjacent grinding belts 6, the tail end of the guide head 1 is fixedly connected with the head end of thetable grinding part 3,water holes 2 for communicating thehollow cavity 8 with the outside of the grinding shoe are uniformly arranged at the head end of the guide head 1, and a joint part 5 for connecting with a drilling tool is fixedly arranged at the tail end of the cylindrical grinding part 4.

Example two

On the basis of the first embodiment, thewater hole 2 adopts a central single water hole structure, a plurality of equidistantly distributed water hole structures surrounding the center or a structure combining a central water hole and a plurality of equidistantly distributed water holes surrounding the center.

The angle between the abrasive belt 6 and the central axis of the body is 20-45 deg.

The angle between the abrasive tape 6 and the central axis of the body is 30 °.

The inner wall of the joint part 5 is provided with aninternal thread 9 which is matched with the external thread of the drilling tool.

The grinding belt 6 is made of hard alloy particle grinding belt.

EXAMPLE III

On the basis of the second embodiment, the diameter of the tail end of thebench grinding part 3 is equal to that of the head end of the cylindrical grinding part 4.

The diameter of the tail end of the cylindrical grinding part 4 is larger than that of the head end of the joint part 5.

A reducing section is formed between the tail end of the cylindrical grinding part 4 and the head end of the joint part 5, and the reducing section adopts a conical transition structure.

The profile of the longitudinal section of the head end of the guide head 1 is semicircular or parabolic, and the middle rear part of the guide head 1 is cylindrical.

Platform mill portion 3 can adapt to the object of multiple size diameter in the pit, utilize the drilling tool to apply the moment of torsion to the junk mill and make its circumferential direction take place, the abrasive band 6 on theplatform mill portion 3 can grind the object in the pit, there is fluid to flow out through thewater hole 2 of leading 1 front end again via joint portion 5 and this somatic part simultaneously inside the drilling tool, the piece after the grinding ofplatform mill portion 3 returns to the annular space between post mill portion 4 and the pit shaft inner wall on along with rivers, it is more tiny piece to be ground by rotatory post mill portion 4 again, the piece continues upwards to return along guiding gutter 7 along rivers, until discharging from the well head.

Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

The present invention has been described in detail, but the above description is only a preferred embodiment of the present invention, and is not to be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims (10)

1. The utility model provides a spiral wing pilot junk mill which characterized in that: the guide head, the body part and the joint part are all of a hollow structure, the interior of the guide head, the interior of the body part and the interior of the joint part are communicated to form a hollow cavity, the body part comprises a bench grinding part and a column grinding part, the bench grinding part is of a circular table structure, the column grinding part is of a cylindrical structure, the tail end of the bench grinding part is fixedly connected with the head end of the column grinding part, grinding belts for grinding underground objects are uniformly arranged on the outer walls of the bench grinding part and the column grinding part, the grinding belts are spirally distributed on the outer walls of the bench grinding part and the column grinding part, a diversion trench for guiding water flow is arranged between adjacent grinding belts, the tail end of the guide head is fixedly connected with the head end of the bench grinding part, and water holes for communicating the hollow cavity with the exterior of a grinding shoe are uniformly formed at the head end of the guide head, and the joint part used for being connected with a drilling tool is fixedly arranged at the tail end of the column grinding part.

2. The spiral wing pilot mill shoe according to claim 1, characterized in that: the water hole adopts a central single water hole structure, a plurality of equidistantly distributed water hole structures surrounding the center or a structure with a plurality of equidistantly distributed water holes surrounding the center.

3. The spiral wing pilot mill shoe according to claim 1, characterized in that: the included angle between the grinding belt and the central axis of the body part is 20-45 degrees.

4. A spiral wing pilot mill shoe according to claim 3, wherein: the included angle between the grinding belt and the central axis of the body part is 30 degrees.

5. The spiral wing pilot mill shoe according to claim 1, characterized in that: and the inner wall of the joint part is provided with an internal thread matched with the external thread of the drilling tool.

6. The spiral wing pilot mill shoe according to claim 1, characterized in that: the grinding belt is made of hard alloy particles.

7. The spiral wing pilot mill shoe according to claim 1, characterized in that: the diameter of the tail end of the bench grinding part is equal to that of the head end of the column grinding part.

8. The spiral wing pilot mill shoe according to claim 1, characterized in that: the diameter of the tail end of the cylindrical grinding part is larger than that of the head end of the joint part.

9. The spiral wing pilot mill shoe according to claim 8, wherein: and a reducing section is formed between the tail end of the cylindrical grinding part and the head end of the joint part, and the reducing section adopts a conical transition structure.

10. The spiral wing pilot mill shoe according to claim 1, characterized in that: the profile line of the longitudinal section of the head end of the guide head is semicircular or parabolic, and the middle rear part of the guide head is cylindrical.

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