CN201883942U - Double-loop-type anti-falling device of air hammer drill bit - Google Patents

Abstract

The utility model relates to a double-loop-type anti-falling device of an air hammer drill bit, which is used for oil and gas drilling and can prevent the problem that the root part of a drill bit spline of an air hammer fractures and falls into a well. The technical scheme is as follows: an outer loop upper-end inner ring is arranged at the upper end of an outer loop; an inner loop has a structure of two symmetrical semi-circles; an inner loop upper-end inner ring is arranged at the upper end of the inner loop with the two semi-circles; an inner loop lower-end inner ring is arranged at the lower end of the inner loop with the two semi-circles; a drill bit spline root outer ring is arranged at the lower end of the root part of the drill bit spline; the lower ends of the outer loop and the inner loop are in threaded connection; a spline joint and the drill bit are connected by a spline; and the outer loop upper-end inner ring and the inner loop upper-end inner ring are clamped by an air hammer shell and the spline joint. In the utility model, when the root part of the drill bit spline fractures, the inner loop lower-end inner ring can clamp the drill bit so that the drill bit can be prevented from falling. The double-loop-type anti-falling device has the characteristics of being convenient in installation, fast and convenient in disassembly, simple in structure and reliable in performance, and is used in well drilling technology of the air hammer.

Description

A kind of dicyclo shell type air hammer drill bit falling-proof apparatus

Technical field

The utility model relates to a kind of special downhole tool that is used for oil, natural gas gas drilling, is particularly useful for the dicyclo shell type air hammer drill bit falling-proof apparatus of long-time continuous heavy duty service.

Background technology

In recent years, because the air hammer drilling technology has high rate of penetration, low the pressure of the drill, and can effectively control the characteristics of hole deviation is in the area, Chongqing of Sichuan, oil (gas) fields such as Tarim Basin, long celebrating have obtained application widely.Along with the development of air hammer drilling technology, air hammer obtains using comparatively widely as its kit at the scene.Because the well that uses air hammer to carry out oil gas drilling has well depth, the pure brill time is long, formation lithology is complicated and changeable characteristics, again because the drill bit processing and manufacturing has problems such as the complexity, qualifying point of operation and technology are many, inevitable during in use the fracture of air hammer drill bit.During the air hammer drilling well,, just must stop immediately creeping into, salvage, and salvage be very difficult and delay drilling time, if can cause drilling well to scrap just salvaging is unsuccessful if in a single day drill bit breaks.The device of well is very necessary so fall after design on the air hammer prevents the drill bit fracture.

Summary of the invention

The purpose of this utility model is: in order to prevent air hammer often take place in using at the scene to fall after the fracture of the drill bit spline root technical problem of well, specially propose a kind of dicyclo shell type air hammer drill bit falling-proof apparatus.This device can effectively prevent to fall into the shaft bottom after the drill bit fracture by the cooperation of inside and outside ring set and band evagination anchor ring drill bit.

In order to achieve the above object, the utility model solves its technical problem by the following technical solutions: a kind of dicyclo shell type air hammer drill bit falling-proof apparatus, form by outer ring set, inner ring sleeve, drill bit, spline joint and air hammer shell.Its architectural feature is: the outer shroud set upper side is provided with ring in the outer shroud set upper side, plays fixing inside and outside ring set; Inner ring sleeve is the semi-circular structure of two symmetries, ring in the inner ring sleeve upper end is provided with the inner ring sleeve upper end, and the inner ring sleeve lower end is provided with ring in the inner ring sleeve lower end; Drill bit spline root lower end is provided with drill bit spline root lower end outer shroud.After the outer shroud cover was inserted in inner ring sleeve, outer ring set and inner ring sleeve lower end were adopted and are threaded, to increase ring set rigidity; Spline joint adopts spline to be connected with drill bit; Encircle in ring and the inner ring sleeve upper end in the outer shroud set upper side and clamp with air hammer shell and spline joint.The radius of drill bit spline root lower end outer shroud is greater than the radius that encircles in ring and the inner ring sleeve lower end in the inner ring sleeve upper end.When fracture took place drill bit spline root, ring can hang broken end in the inner ring sleeve lower end, prevented that broken end from falling.

The utility model compared with prior art, its beneficial effect is: under the prerequisite of basic structure that does not change air hammer and functional performance, solved rupture the problem of well of recurrent drill bit spline root during air hammer uses at the scene; And this structure has easy for installation compared with other structures of the same type, and dismounting is quick, the advantage of simple in structure and dependable performance.

Description of drawings

Fig. 1 is the utility model dicyclo shell type air hammer drill bit falling-proof apparatus structural representation;

Fig. 2 is inner ring sleeve 2 structural representations of the present utility model;

Fig. 3 is outer ring set 1 structural representation of the present utility model.

Among the figure, 1. outer ring set; 2. inner ring sleeve; 3. drill bit; 4. spline joint; 5. air hammer shell; A. encircle in the outer shroud set upper side; B. encircle in the inner ring sleeve upper end; C. encircle in the inner ring sleeve lower end; D. drill bit spline root lower end outer shroud.

The specific embodiment

Specific embodiment: a kind of dicyclo shell type air hammer drill bit falling-proof apparatus comprises: outer ring set 1, inner ring sleeve 2, drill bit 3, spline joint 4 and air hammer shell 5.Spline joint 4 adopts spline to be connected with drill bit 3, and spline joint 4 adopts with air hammer shell 5 and is threaded.Drill bit 3 spline root lower ends have drill bit spline root lower end outer shroud D.Outer ring set 1 upper end is provided with ring A in the outer shroud set upper side.Two symmetrical inner ring sleeve 2 upper ends are provided with ring B in the inner ring sleeve upper end, and two symmetrical inner ring sleeve 2 lower ends are provided with ring C in the inner ring sleeve lower end.Two symmetrical inner ring sleeves 2 are formed a ring and are entangled by outer ring set 1, have realized the radially fixing of symmetrical inner ring sleeve 2.Encircle B in ring A and the inner ring sleeve upper end in the outer shroud set upper side and clamped by air hammer shell 5 and spline joint 4, outer ring set 1 adopts with inner ring sleeve 2 lower ends and is threaded, and realizes the axial restraint of three ring sets thus.

During use, drill bit 3 is inserted in spline joint 4, two inner ring sleeves 2 are enclosed within being connected on the step surface of drill bit 3 and spline joint 4, then outer ring set 1 is inserted in two inner ring sleeves 2, inner ring sleeve 2 adopts with outer ring set 1 bottom and is threaded.The spline joint 4 that will package dicyclo cover at last is screwed in the screw thread in the air hammer shell 5.Owing to encircle the radius of the radius of C in the inner ring sleeve upper end in ring B and the inner ring sleeve lower end less than drill bit spline root lower end outer shroud D, so when fracture takes place in drill bit 3 spline roots, drill bit 3 meetings that fall of breaking are hung by ring C in the inner ring sleeve lower end of inner ring sleeve 2, and breaking when mentioning air hammer falls drill bit also with boring salvaging.

Claims (2)

1. a dicyclo shell type air hammer drill bit falling-proof apparatus is made up of outer ring set, inner ring sleeve, drill bit, spline joint and air hammer shell, it is characterized in that: outer ring set (1) upper end is provided with ring (A) in the outer shroud set upper side; Inner ring sleeve (2) is the semi-circular structure of two symmetries, ring (B) in inner ring sleeve (2) upper end is provided with the inner ring sleeve upper end, and inner ring sleeve (2) lower end is provided with ring (C) in the inner ring sleeve lower end; After outer ring set (1) was inserted in inner ring sleeve (2), outer ring set (1) adopted with inner ring sleeve (2) lower end and is threaded; Spline joint (4) adopts spline to be connected with drill bit (3), and drill bit spline root lower end is provided with drill bit spline root lower end outer shroud (D); Encircling (B) in ring (A) and the inner ring sleeve upper end in the outer shroud set upper side clamps with air hammer shell (5) and spline joint (4).

2. dicyclo shell type air hammer drill bit falling-proof apparatus according to claim 1 is characterized in that: the radius of drill bit spline root lower end outer shroud (D) is greater than the radius of ring (C) in ring (B) and the inner ring sleeve lower end in the inner ring sleeve upper end.

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