CN202510074U

CN202510074U - Pilot milling shoe

Info

Publication number: CN202510074U
Application number: CN2012201460691U
Authority: CN
Inventors: 于广鹏; 赵德宝; 潘俊; 朱国良; 韩召宝; 邓春光; 张天广
Original assignee: China National Petroleum Corp; Liaohe Petroleum Exploration Bureau
Current assignee: China National Petroleum Corp; Liaohe Petroleum Exploration Bureau
Priority date: 2012-03-31
Filing date: 2012-03-31
Publication date: 2012-10-31
Anticipated expiration: 2022-03-31

Abstract

The utility model relates to a tool for operations on changing a casing during the process of repairing an oil well, and in particular to a pilot milling shoe. The device comprises a milling shoe body, wherein a female thread is designed on the upper end of the milling shoe body; a male thread is designed on the lower end of the milling shoe body; a main circulating water hole is opened in the center of the milling shoe body; the middle part of the milling shoe body is provided with an external stage; a reverse milling blade is welded on the upper end face of the external stage; a hard alloy is welded on the lower end face; secondary circulating water holes are respectively obliquely opened in the external stage and the hard alloy; and the secondary circulating water holes are communicated with the main circulating water hole. The pilot milling shoe achieves the connection with a tracing pipe column; therefore, the tracing pipe column or a sleeve fish top is prevented from being lost; meanwhile, the damaged fish top or a falling object can be abraded and milled; and as such, the well is expanded in a milling way. Additionally, the defect that the existing milling shoe only can be connected with the bottom of a drill, but cannot be connected with the tracing pipe column, resulting in easy losses of the tracing pipe column and the sleeve fish top, is overcome.

Description

A kind of introduction junk mill

Technical field:

The utility model relates to a kind of petroleum well workover and gets and change cover operation instrument, particularly a kind of introduction junk mill.

Background technology:

At present, in the petroleum well workover operation, the cover method is bought or get by illegal means in commonly used getting to be spike tubing string method and once to overlap milling.Spike tubing string method: get the cover before in well, be lowered to suitable dimension drilling tool as the spike tubing string.Mill at milling, cutting, cover, in the process such as salvaging, back-off, the spike tubing string is applied in well head and the production string all the time, loses in bore hole to prevent top of fish.Conventional junk mill can only be connected the bottom of drilling tool, can not be connected with the spike tubing string, and spike tubing string, sleeve pipe top of fish are prone to lose.

The utility model content:

The technical problem that the utility model will solve provides a kind of introduction junk mill, and this junk mill has been realized being connected with the spike tubing string, prevents that spike tubing string or sleeve pipe top of fish from losing, simultaneously can damaged top of fish, the junk of milling, and expand and mill well.Overcome the bottom that existing junk mill can only be connected drilling tool, can not be connected, the deficiency that spike tubing string, sleeve pipe top of fish are prone to lose with the spike tubing string.

The technical scheme that the utility model is taked is: a kind of introduction junk mill comprises the junk mill body; Junk mill body upper end is designed with box thread; The lower end is designed with male thread, and the center has the major cycle hydrophthalmia, and junk mill body middle part is designed with outer step; Be welded with the anti-sword that mills on the outer step upper surface; The lower surface is welded with carbide alloy, obliquely on step and the carbide alloy outside has a secondary circulation hydrophthalmia, and secondary circulation hydrophthalmia is connected with the major cycle hydrophthalmia.

The beneficial effect of the utility model is: the utility model has been owing to adopted the lower end to be designed with the mode of male thread, thereby has with the spike tubing string and be connected, and prevents the function that spike tubing string or sleeve pipe top of fish are lost; Because adopted outside to be welded with the anti-sword that mills on the step upper surface, the lower surface is welded with the mode of carbide alloy, thereby have milling damaged top of fish, junk, expand the function of milling well.

Description of drawings:

Below in conjunction with the accompanying drawing and the specific embodiment the utility model is done further detailed explanation.

Accompanying drawing is the structural representation of the utility model.

The specific embodiment:

Shown in accompanying drawing, a kind of introduction junk mill comprises junk mill body 6; Junk mill body 6 upper ends are designed with box thread 1, and the lower end is designed with male thread 7, and the center has major cycle hydrophthalmia 3; Junk mill body 6 middle parts are designed with outer step; Be welded with the anti-sword 2 that mills on the outer step upper surface, the anti-sword 2 that mills is used for the anti-releasing bit freezing that mills, and the lower surface is welded with carbide alloy 5; Carbide alloy 5 is used for milling junk or top of fish; Obliquely on step and the carbide alloy 5 outside have a secondary circulation hydrophthalmia 4, secondary circulation hydrophthalmia 4 is connected with major cycle hydrophthalmia 3, and major cycle hydrophthalmia 3 is used to the workover fluid that circulates with secondary circulation hydrophthalmia 4.

When former casing top of fish damaged or has the smallclothes junk maybe need expand to mill well, junk mill body 6 upper ends of the utility model connected drilling tool, and junk mill body 6 lower ends are connected on the spike tubing string, carry out milling, if on carry junk mill and meet card, then directly counter milling removed bit freezing.

It is understandable that; More than about the specific descriptions of the utility model; Only be used to the utility model is described and be not to be subject to the described technical scheme of the utility model embodiment; Those of ordinary skill in the art should be appreciated that still and can make amendment or be equal to replacement the utility model, to reach identical technique effect; As long as satisfy the use needs, all within the protection domain of the utility model.

Claims

1. an introduction junk mill comprises junk mill body (6); It is characterized in that: junk mill body (6) upper end is designed with box thread (1); The lower end is designed with male thread (7), and the center has major cycle hydrophthalmia (3), and junk mill body (6) middle part is designed with outer step; Be welded with the anti-sword (2) that mills on the outer step upper surface; The lower surface is welded with carbide alloy (5), and step and carbide alloy (5) are gone up the oblique secondary circulation hydrophthalmia (4) that has outside, and secondary circulation hydrophthalmia (4) is connected with major cycle hydrophthalmia (3).