CN203335006U - Milling overshot for short and light falling object - Google Patents

Abstract

The utility model discloses a milling overshot for a short and light falling object. The milling overshot is characterized in that the upper portion of a thin-wall tube inner slotted overshot body is connected with a drilling tool connector through a thick pin, a milling drilling head is made in the mode that tungsten nitride tungsten steel powder is welded to zigzag-shaped teeth formed at the bottom of the thin-wall tube inner slotted overshot body in a cut mode. When the short and light column-shaped falling object which is buried and stuck is savaged, certain drilling pressure can be exerted, a drilling tool is rotated for milling, the falling object is sleeved with the thin-wall tube inner slotted overshot body due to the fact that the thin-wall tube inner slotted overshot body is guided by the milling drilling head, a slotted clamping plate can timely grasp the light, short and irregular column-shaped falling object, the size of the falling object is not fixed, the internal salvage size of the falling object and the borehole size are limited simultaneously, a falling object with a shoulder can be squeezed and grasped to form an inverted support in the slotted clamping plate of the thin-wall tube inner slotted overshot body, salvage can be easily achieved, and falling objects at the bottom of a well an be removed. The length of the thin-wall tube inner slotted overshot body can be adjusted and replaced according to the length of the salvaged falling object, and the density and the layout of the slotted clamping plate can be adjusted according to the object shape of the salvaged falling object.

Description

Short light junk cover mills fishing socket

Technical field

Salvaging and inner size and the simultaneously limited fishing junk of borehole size salvaged of the slightly irregular column junks such as the utility model relates to the PDC of certain-length body drill bit in Process of Oil Well Drilling, the first-class relatively short lighter column of crossover sub, screw rod rotation, helicoid hydraulic motor core.

Background technology

It is lighter because of the weight of junk when in Process of Oil Well Drilling, to the relatively short lighter slightly irregular column such as the PDC drill bit that the certain-length body is arranged, crossover sub, screw rod swivel head and helicoid hydraulic motor core, for junk, the instruments such as die nipple, female coupling tap, slip socket, slips salvaging thatch are salvaged, and inside dimension is limited, the male and female cone is difficult for successful thread making and easily causes salvaging unsuccessfully.Slip socket can't catch junk to cause salvaging unsuccessfully when too short, irregular and size is uncertain because of junk.Slip socket, slips salvaging thatch grab tight junk because of the too light cause slips of junk after salvaging and also easily cause salvaging unsuccessfully.Inner salvage size and borehole size simultaneously limited junk can't salvage internally, while salvaging from outside because not having suitable fishing tool can only take the drop mode of thing or well filling sidetracking of milling to continue to creep into.This had both delayed a large amount of drilling well production times, had delayed again the oil-gas exploration progress.

Summary of the invention

Problem for above-mentioned existence, the purpose of this utility model has aimed to provide a kind of short light junk cover and has milled fishing socket, this instrument first can enter the principle of the limited junk annular space of borehole size according to light-wall pipe, second according to the clamp of windowing there is good springiness, intensity is high, grip is strong principle supports the short light junk that enters thin-walled dipper inside, is that a cover of salvaging from outside mills and salvages the fishing tool had concurrently.

The purpose of this utility model completes like this:

Short light junk cover mills fishing socket and mainly is comprised of tool joint, light-wall pipe inwardopening window dipper, milling bit, thick pin and thick pin; light-wall pipe inwardopening window dipper top becomes cross to be connected with thick pin with thick pin with tool joint, and milling bit is that on the serrated teeth be slit in light-wall pipe inwardopening window dipper bottom, welding-on tungsten nitride wolfram steel powder is made.

The beneficial effect of advantage of the present utility model and generation is:

1, the utility model is simple in structure, is easy to processing, adopts conventional part assembling, easily installing/dismounting.Can salvage from outside irregular, size is uncertain, inner size and the simultaneously limited approximate column junk of borehole size salvaged, and after salvaging, also can re-assembly, reuse, and safe and reliable.

2, the utility model is that a salvaging size is adjustable, has cover and mills, salvages the fishing tool had concurrently, and scene is successful Application, while applying, also can greatly reduce post workman's labour intensity, improves timeliness, accelerates the oil-gas exploration progress.

The accompanying drawing explanation

Fig. 1 is the utility model sectional view.

The specific embodiment

As shown in Figure 1, a kind of short light junk cover mills fishing socket and mainly is comprised of tool joint 1, light-wall pipe inwardopening window dipper 2, milling bit 3, thick pin 4 and thick pin 5; light-wall pipe inwardopening window dipper 2 tops are connected with thick 5 one-tenth crosses of pin with the thick pin 4 of tool joint 1 use, and milling bit 3 is that on the serrated teeth be slit in light-wall pipe inwardopening window dipper 2 bottoms, welding-on tungsten nitride wolfram steel powder is made.

Light-wall pipe inwardopening window dipper 2 tops and the thick pin 4 of tool joint 1 use with weld stem knob and tube wall place by electrical pads again after thick 5 one-tenths assorted words of pin are connected, prevent that thick pin from exiting.Two thick pins can bear the moment of torsion transmitted between tool joint 1 and light-wall pipe inwardopening window dipper 2, resistance to compression and stretching resistance, light-wall pipe inwardopening window dipper 2 adopts high-strength thin-walled tubing, there is intensity after the clamp annealing in process of windowing high, good springiness, the characteristics that grip is strong, the length of light-wall pipe inwardopening window dipper 2 can be adjusted replacing according to the length of being salvaged junk, also can to window clamp density and layout, be adjusted according to the concrete shape that is dragged for junk, because of wall thin, outside and the male and female cone of holding that can pack into easily borehole size and inner salvaging size limited junk of while is difficult for salvaging thread making and slips salvaging thatch, slip socket is grabbed not firm shorter lighter junk.

When the junk of card is buried in salvaging, can apply certain the pressure of the drill and rotate drilling tool and overlap and mill; when light-wall pipe inwardopening window dipper 2 progressively packs into junk under the guiding of milling bit 4; because of inwardopening window clamp tool, can hold easily in time and enter the intrinsic junk of window cutting dipper; having the junk of shoulder to form to fall to support in the clamp of windowing of light-wall pipe inwardopening window dipper 2, can realize easily salvaging, removing bottom hole falling article.

Claims (1)

1. One kind short light junk cover mill fishing socket mainly by tool joint (1), light-wall pipe inwardopening window dipper (2), milling bit (3), thick pin (4) and slightly pin (5) form, it is characterized in that light-wall pipe inwardopening window dipper (2) top becomes cross to be connected with thick pin (4) with thick pin (5) with tool joint (1), milling bit (3) is that on the serrated teeth be slit in light-wall pipe inwardopening window dipper (2) bottom, welding-on tungsten nitride wolfram steel powder is made.

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