CN203383763U - Roller concave-bottom milling shoe for horizontal well of oil field - Google Patents

Abstract

The utility model relates to a milling tool for oil horizontal well operation, in particular to a roller concave-bottom milling shoe for a horizontal well of an oil field. A plurality of uprighting wings are designed on the outer wall of a milling shoe body of the tool; rollers are mounted on curved surfaces of the uprighting wings; and the bottom of the milling shoe body is designed into a concave surface provided with a plurality of milling teeth. According to the roller concave-bottom milling shoe, uprighting of the milling shoe in the horizontal well is realized, the damage caused by the milling shoe to a horizontal well sleeve pipe is reduced, the frictional resistance is reduced, the effective milling area is increased, the milling efficiency is improved, and the service life is prolonged. Disadvantages that a conventional flat-bottom milling shoe can cause eccentric milling easily, great damage is caused to the horizontal well sleeve pipe, the frictional resistance is large, the milling efficiency is low, and the service life is short are overcome.

Description

A kind of oilfield horizontal well roller concave bottom milling shoe

Technical field:

The utility model relates to a kind of oilfield horizontal well operation milling tool, particularly a kind of oilfield horizontal well roller concave bottom milling shoe.

Background technology:

Existing flat-bottom grind shoes is mainly used for vertical oil well operation, but due to horizontal well casing pipe, to compare the Vertical Well gradient larger in the horizontal well use procedure, under the self gravitation effect of oil well horizontal section tubing string and junk mill, make junk mill produce eccentric wear, the horizontal oil sleeve pipe is easily caused to damage, and resistance increment during junk mill rotation milling, milling efficiency and the application life of having reduced junk mill.

The utility model content:

The technical problems to be solved in the utility model is to provide a kind of oilfield horizontal well roller concave bottom milling shoe, this instrument has been realized junk mill righting in horizontal well, reduces the damage of junk mill to horizontal well casing pipe, reduces frictional resistance, increase the effective area of milling, improve milling efficiency and application life.Overcome existing flat-bottom grind shoes and easily produced eccentric wear, large to the horizontal oil casing damage, frictional resistance is large, the deficiency that milling efficiency and application life are low.

Technical solution adopted in the utility model is: a kind of oilfield horizontal well roller concave bottom milling shoe, comprise top connection and junk mill body, and the top connection lower end connects the junk mill body; Be designed with a plurality of righting wings on junk mill body outer wall, on righting wing curved surface, roller be installed, junk mill body bottom design becomes the concave surface with a plurality of mill teeths.

The beneficial effects of the utility model are: the utility model is owing to having designed the righting wing and roller, thereby has junk mill righting in horizontal well and reduce the function of frictional resistance, reduces the damage of junk mill to horizontal well casing pipe; Owing to having adopted, junk mill body bottom design is become to the concave surface with a plurality of mill teeths, thereby increased the effective area of milling, improve milling efficiency and application life.

The accompanying drawing explanation:

Below in conjunction with the drawings and specific embodiments, the utility model is described in more detail.

Fig. 1 is structural representation of the present utility model.

The upward view that Fig. 2 is Fig. 1.

The specific embodiment:

As shown in Figure 1, a kind of oilfield horizontal well roller concave bottom milling shoe, comprise top connection 1 and junk mill body 2, and top connection 1 lower end connects junk mill body 2; Be designed with a plurality of righting wings 3 on junk mill body 2 outer walls, on the righting wing 3 curved surfaces, roller 4 be installed, junk mill body 2 bottom design become the concave surface 5 with a plurality of mill teeths 6.

When the utility model carries out milling operation, 3 pairs of junk mills of the righting wing carry out righting, when the righting wing 3 produces friction with sleeve pipe, the rolling friction of roller 4 and internal surface of sleeve pipe changed into both frictions by roller 4 by original slip, reduce degree of injury and the frictional resistance of junk mill to sleeve pipe.The many mill teeths concave surface that is 15 degree angles by the bottom design of junk mill, increased the effective area of milling, and the relatively fixing oil well falling-matter of concave surface in the milling process, improved the milling efficiency of junk mill.

Be understandable that, above about specific descriptions of the present utility model, only for being described, the utility model not is limited to the described technical scheme of the utility model embodiment, those of ordinary skill in the art is to be understood that, still can modify or be equal to replacement the utility model, to reach identical technique effect; Use needs as long as meet, all within protection domain of the present utility model.

Claims (1)

1. an oilfield horizontal well roller concave bottom milling shoe, comprise top connection (1) and junk mill body (2), and top connection (1) lower end connects junk mill body (2); It is characterized in that: be designed with a plurality of righting wings (3) on junk mill body (2) outer wall, on the righting wing (3) curved surface, roller (4) be installed, junk mill body (2) bottom design becomes the concave surface (5) with a plurality of mill teeths (6).

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