CN210118098U

CN210118098U - Novel tooth-shaped structure of arc-parabola-arc

Info

Publication number: CN210118098U
Application number: CN201921077357.4U
Authority: CN
Inventors: 黄志强; 周操; 马亚超; 张文琳; 谢豆; 朱晶; 伍家屺
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2020-02-28
Anticipated expiration: 2029-07-11

Abstract

The utility model relates to a novel tooth-shaped structure of circular arc-parabola-circular arc, which mainly comprises a tooth column, a tooth top, a second circular arc surface, a paraboloid and a first circular arc surface; the track of the tooth top of the profile diagram of the tooth-shaped structure mainly comprises a first arc, a parabola, a second arc and a third arc, wherein the first arc is tangent to the parabola, the parabola is tangent to the second arc, and the second arc is tangent to the third arc; when the geophysical prospecting drill bit works, the alloy teeth have the impact action in the vertical direction and the scraping action in the circumferential direction; the alloy tooth top adopts the structure of spherical tooth, and the spherical tooth part of alloy tooth strikes broken rock under the impact of drill bit, and in the impact, first arc, second arc and paraboloid scrape the rock under rotatory effect. The utility model discloses can improve broken rock inefficiency of drill bit in the crisscross stratum of soft or hard, reduce the damage of drill bit.

Description

Novel tooth-shaped structure of arc-parabola-arc

Technical Field

The utility model relates to a novel profile of tooth structure of circular arc-parabola-circular arc belongs to oil gas drilling exploration field.

Background

With the continuous and deep development of petroleum resource exploration, the geological exploration drilling environment in China is increasingly severe, the drilling difficulty is increased continuously, and the requirements on drilling tools are increased. The teeth of the geophysical prospecting drill bit for domestic drilling exploration mainly adopt spherical teeth or conical teeth, the spherical teeth have strong impact resistance, are not easy to break in the drilling process, but are not beneficial to tooth penetration, and the geophysical prospecting drill bit is mainly suitable for hard strata; the tapered teeth are easy to invade rock stratum to break rock in the drilling process, but the tapered teeth are easy to break, and the tapered teeth are mainly suitable for soft stratum.

However, for the formation with soft and hard staggered layers, the teeth of the geophysical prospecting drill bit are required to have better scraping capability and certain impact resistance. The existing spherical teeth and conical teeth are difficult to simultaneously meet the conditions, so that the drilling speed of a drill bit is low when the drill bit is used for drilling soft and hard staggered strata, and the drilling efficiency is low. In order to solve the current problems, a novel tooth-shaped structure of an arc-parabola-arc is provided, and the drilling efficiency of a geophysical prospecting drill bit in soft and hard staggered strata is improved.

Disclosure of Invention

The utility model aims at solving the problems of low rock breaking efficiency of the drill bit in the soft and hard staggered stratum and serious damage of the drill bit, and provides a novel tooth-shaped structure of an arc-parabola-arc.

The utility model discloses realize that the technical scheme that its purpose adopted is:

a novel tooth-shaped structure of arc-parabola-arc mainly comprises a tooth column, a tooth top, a second arc surface, a paraboloid and a first arc surface; the track of the profile of the tooth-shaped structure at the tooth crest mainly comprises a first arc, a parabola, a second arc and a third arc, wherein the first arc is tangent to the parabola, the parabola is tangent to the second arc, and the second arc is tangent to the third arc; the first arc surface is formed by rotating a first arc along the circumferential direction; the paraboloid is formed by cutting a tooth top along a direction perpendicular to the section by a parabola; the second arc surface is formed by rotating the edge of the second arc along the parabola to cut at the tooth top.

The left end of the circular arc is tangent with the surface of the tooth column, the upper end of the circular arc is tangent with the parabola, and the relational expression is X²+(Y+R₂)²＝R₂ ²(ii) a The upper end of the parabola is tangent to the second arc, and the relation is A²Y-BX ²0; the right end of the circular arc two is tangent to the circular arc three, and the relational expression is (X-A-R)₁)²+(Y-B)²＝R₁ ²(ii) a The third arc is an arc formed by the section of the spherical tooth crest and has the relation of (X-R)₃+R₂)²+Y²＝R₃ ²。

A section view of a circular arc-parabola-circular arc tooth profile structure under a coordinate system, wherein R is₁Is the radius of the circular arc II; said R₂Is the radius of the first arc; said R₃Is the radius of arc three; a is the length of the intersection point of the parabola and the second arc along the X direction; and B is the length of the intersection point of the parabola and the second arc along the Y direction.

Compared with the prior art, the invention has the following advantages: 1. the arc-parabola-arc section scrapes and breaks rocks, and can be used for soft strata such as sandstone and the like and medium soft strata; 2. the spherical crown part is used for impact rock breaking and can be used for harder formations; 3. the novel tooth-shaped structure combining the arc, the parabola and the arc and the spherical crown improves the drilling efficiency of the geophysical prospecting drill bit in the soft and hard staggered stratum.

Drawings

Fig. 1 is a front view of a novel tooth-shaped structure of arc-parabola-arc of the present invention;

fig. 2 is a side view of a novel tooth-shaped structure of arc-parabola-arc of the present invention;

FIG. 3 is a cross-sectional view of FIG. 2 (M-M);

fig. 4 is a sectional view of a novel tooth-shaped structure of an arc-parabola-arc according to the present invention;

fig. 5 is a partial enlarged view of the arc-parabola-arc of the present invention;

figure 6 is a graph of the arc-parabola-arc of the present invention.

In the figure: 1. a tooth post; 2. tooth top; 3. a first arc; 4. a parabola; 5. a second arc; 6. arc three; 7. a second arc surface; 8. a paraboloid; 9. a first arc surface.

Detailed Description

The invention will be further described with reference to the following figures and examples:

as shown in fig. 1, 2, 3 and 4, a novel tooth-shaped structure of arc-parabola-arc mainly comprises a tooth column 1, a tooth top 2, a second arc surface 7, a paraboloid 8 and a first arc surface 9; the track of the profile of the tooth-shaped structure at the tooth crest 2 mainly comprises a first arc 3, a parabola 4, a second arc 5 and a third arc 6, wherein the first arc 3 is tangent to the parabola 4, the parabola 4 is tangent to the second arc 5, and the second arc 5 is tangent to the third arc 6; the first arc surface 9 is formed by rotating the first arc 3 along the circumferential direction; the paraboloid 8 is formed by cutting the tooth top 2 along the direction vertical to the section by the parabola 4; the second arc surface 7 is formed by rotating the second arc 5 along the edge of the parabola 4 cut at the tooth top.

As shown in fig. 5 and 6, the left end of the arc-3 is tangent to the surface of the tooth column 1, the upper end is tangent to the parabola 4, and the relational expression is X²+(Y+R₂)²＝R₂ ²(ii) a The upper end of the parabola 4 is tangent to the second arc 5, and the relation is A²Y-BX ²0; the right end of the second arc 5 is tangent with the third arc 6, and the relational expression is (X-A-R)₁)²+(Y-B)²＝R₁ ²(ii) a The third arc 6 is an arc formed by the section of the spherical tooth top 2 and has a relation of (X-R)₃+R₂)²+Y²＝R₃ ²。

As shown in fig. 6, the section of the circle-parabola-circle tooth profile structure under the coordinate system, R₁Is the radius of the second arc 5; said R₂Is the radius of the first arc 3; said R₃Is the radius of arc three 6; a is parabola 4 and arc II 5The length of the intersection point of (a) in the X direction; and B is the length of the intersection point of the parabola 4 and the second arc 5 along the Y direction.

The working principle is as follows:

when the geophysical prospecting drill bit works, the alloy teeth have impact action in the vertical direction and scraping action in the circumferential direction, the top end of the alloy teeth adopts a spherical tooth structure, and the spherical tooth part of the alloy teeth is impacted to break rocks under the impact action of the drill bit; the first circular arc surface 9, the second circular arc surface 7 and the paraboloid 8 scrape rocks under the rotation of the drill bit while impacting; in soft and hard staggered strata, when a drill bit drills a softer stratum, scraping rocks mainly by taking an arc-parabola-arc part as a main part; when drilling hard stratum, mainly using spherical crown as main part to impact and break rock.

Claims

1. The utility model provides a novel profile of tooth structure of circular arc-parabola-circular arc, mainly comprises tooth post (1), addendum (2), second arc surface (7), paraboloid (8), first arc surface (9), its characterized in that: the trajectory of a profile diagram of the tooth-shaped structure at the tooth crest (2) mainly comprises a first arc (3), a parabola (4), a second arc (5) and a third arc (6), wherein the first arc (3) is tangent to the parabola (4), the parabola (4) is tangent to the second arc (5), and the second arc (5) is tangent to the third arc (6); the first arc surface (9) is formed by rotating the first arc (3) along the circumferential direction; the paraboloid (8) is formed by cutting the tooth top (2) along the direction vertical to the section plane by a parabola (4); the second arc surface (7) is formed by rotating an edge of the second arc (5) cut at the tooth top along the parabola (4).

2. The novel tooth-shaped structure of the arc-parabola-arc as claimed in claim 1, wherein: the left end of the arc I (3) is tangent to the surface of the tooth column (1), the upper end of the arc I is tangent to the parabola (4), and the relational expression is X²+(Y+R₂)²＝R₂ ²(ii) a The upper end of the parabola (4) is tangent to the second arc (5), and the relational expression is A²Y-BX²0; the right end of the second arc (5) is tangent to the third arc (6), and the relational expression is (X-A-R)₁)²+(Y-B)²＝R₁ ²(ii) a The third arc (6) is an arc formed by the section of the spherical tooth top (2), and the relational expression is (X-R)₃+R₂)²+Y²＝R₃ ²。