A self-correcting forced guide for drilling tools

Abstract

The present invention discloses a self-correcting forced guide for a drilling tool, which comprises a cylindrical center body, a coaxial convex ring extending axially from the middle and lower part of the outer wall of the center body, an annular box body is sleeved on the outside of the convex ring, a certain distance is provided between the inner ring surface of the annular box body and the outer wall of the convex ring, and an annular support for placing the annular box body is installed on the outside of the convex ring; the inside of the annular box body is divided into a plurality of first cavities and a plurality of second cavities, the first cavity and the second cavity are arranged adjacent to each other in sequence, a first telescopic mechanism and a second telescopic mechanism are respectively arranged in each first cavity and each second cavity, the fixed ends of the two telescopic mechanisms are both fixedly connected to the annular box body, the protruding end of the first telescopic mechanism faces the center body and is connected to a roller assembly, and the protruding end of the second telescopic mechanism protrudes out of the annular box body and is movably connected to an arc-shaped shoe plate. The present invention enables the drilling tool to be used for the construction of wellbores with different diameters, realizes deviation correction, ensures the verticality of drilling, and has a better guiding effect.

Description

Technical Field

[0001] The invention relates to the technical field of excavation machinery and equipment for petroleum, coal mines, exploration and mining, and in particular to a self-correcting forced guider for a drilling tool. Background Art

[0002] Drilling rigs are often used in underground construction machinery. During the construction of drilling rigs, it is generally necessary to position the drilling tools to ensure the construction quality. At present, in the process of drilling with drilling rigs, in order to avoid the shaking of the drilling tool system, a drilling tool guide is generally provided. There are two structures of current drilling tool guides. One is a frame structure that rotates with the drill rod. The frame structure is fixedly connected to the drill rod. The outermost side of the frame structure retains a certain gap with the well wall. This guide has a simple structure and low cost. However, when encountering undesirable geological conditions and the well wall collapses, the guide is easy to get stuck, causing the drill to get stuck; the other is a guide that can rotate relative to the drill rod. This guide can rotate with the drill rod or remain stationary. The outermost side of the guide retains a certain gap with the well wall, which solves the drill stuck problem of the first guide structure. However, due to the certain gap between the guide and the well wall, the guiding effect is not ideal; in addition, the above guides are all fixed diameter structures and cannot be used when the wellbore diameter changes. Summary of the invention

[0003] To solve the above problems, the purpose of the present invention is to provide a self-correcting forced guide for a drilling tool, which has a good guiding effect and can enable a drilling rig equipped with the drilling tool to be used for the construction of wells with different diameters.

[0004] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme:

[0005] A self-correcting forced guide for a drilling tool, comprising a cylindrical center body, a coaxial convex ring extending axially from the middle and lower part of the outer wall of the center body, an annular box body is sleeved on the outside of the convex ring, a certain distance is provided between the inner ring surface of the annular box body and the outer wall of the convex ring, an annular support is installed on the outside of the convex ring, and the annular support is located below the annular box body; the inside of the annular box body is divided into a plurality of first cavities and a plurality of second cavities by a plurality of vertically arranged partitions, the first cavities and the second cavities are arranged adjacent to each other in sequence, the plurality of first cavities are evenly spaced along the circumferential direction, and the plurality of second cavities are evenly spaced along the circumferential direction, each first cavity is provided with a first telescopic mechanism, the fixed end of the first telescopic mechanism is fixedly connected to the annular box body, the protruding end faces the center body and is connected to a roller assembly, each second cavity is provided with a second telescopic mechanism, the fixed end of the second telescopic mechanism is fixedly connected to the annular box body, the protruding end protrudes out of the annular box body and is movably connected to an arc-shaped shoe plate; a longitudinally penetrating channel is opened at the center of the center body.

[0006] Furthermore, the top and bottom of the central body are respectively provided with an upper flange and a lower flange, and the upper flange and the lower flange are coaxially arranged with the central body, connected to the drill pipe through the upper flange, and connected to the drilling tool through the lower flange.

[0007] Furthermore, a plurality of measuring cylinders evenly distributed at intervals are provided inside the annular box along the circumferential direction, and the eccentric distance of the central body is measured by the measuring cylinders, thereby adjusting the telescopic amount of the first telescopic mechanism to achieve the centering of the guide.

[0008] Furthermore, two symmetrically distributed or a plurality of evenly spaced limiting blocks are provided at a convex ring near the center body on the inner side of the top of the annular box body.

[0009] Furthermore, the first telescopic mechanism and the second telescopic mechanism mentioned above both adopt hydraulic cylinders or pneumatic cylinders.

[0010] The present invention also includes a self-correcting forced guide device group for a drilling tool, which is composed of the two self-correcting forced guides mentioned above, the bottom of the central body of the first self-correcting forced guide located at the upper part and the top of the central body of the second self-correcting forced guide located at the lower part are connected by a flange, the bottom of the annular box body of the first self-correcting forced guide and the top of the annular box body of the second self-correcting forced guide are connected by a connecting sleeve, and there is a certain distance between the inner wall of the connecting sleeve and the central body.

[0011] Furthermore, the distance between the inner wall of the connecting sleeve and the central body is greater than the maximum diameter of the flange connecting the two and less than the diameter of the circumference of the plurality of arc-shaped shoe plates.

[0012] Due to the adoption of the above-mentioned technical solution, the present invention has the following advantages:

[0013] The self-correcting forced guide of the drill tool has a simple structure, a reasonable and novel design, an ingenious conception, is easy to manufacture, simple to operate, and stable in construction. The maximum diameter of the guide can be changed by using a plurality of first telescopic mechanisms, so that the drill tool can be used for the construction of wellbores with different diameters, and has good versatility; the arc-shaped shoe plate can be pressed tightly against the well wall without leaving any gap, and can contact the arc surface of the well wall, so that the contact area is larger, and the hole wall collapse caused when drilling into unstable formations is avoided, and the guiding effect is better; while the drill tool is drilling downward, it rolls and slides between a plurality of roller assemblies and the outer cylindrical surface of the center body, so as to realize the forced guidance of the drill tool; when the center body is deflected, the deviation can be corrected by adjusting the elongation of the first telescopic mechanism to ensure the verticality of the drilling; it is strong and durable, easy to install and maintain, and can effectively extend the service life of the drill tool, so it has good promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a schematic diagram of the top view of the structure of the self-correcting forced guide of the drilling tool of the present invention;

[0015] Figure 2 yes Figure 1 A-A sectional structural diagram;

[0016] Figure 3 It is a structural schematic diagram of the working state of the self-correcting forced guide of the drilling tool of the present invention;

[0017] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure of Part I;

[0018] Figure 5 It is a structural schematic diagram of the self-correcting forced guider group of the drilling tool of the present invention;

[0019] In the figure: 1-upper flange; 2-center body; 3-convex ring; 4-annular box; 5-roller assembly; 6-first telescopic mechanism; 7-annular support; 8-lower flange; 9-measuring cylinder; 10-second telescopic mechanism; 11-arc shoe plate; 12-channel; 13-limiting block; 14-first self-correcting forced guide; 15-connecting sleeve; 16-second self-correcting forced guide. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 1 , 2As shown in , 3, 4, and 5, the self-correcting forced guide of the drilling tool includes a cylindrical center body 2, a coaxial convex ring 3 is axially extended from the middle and lower part of the outer wall of the center body, an annular box body 4 is sleeved on the outside of the convex ring, the longitudinal section of the annular box body is convex, and there is a certain distance between the inner ring surface of the annular box body and the outer wall of the convex ring, an annular support 7 is installed on the outside of the convex ring, and the annular support is located below the annular box body 4, and the annular support is used to place the annular box body; the inside of the annular box body is divided into a plurality of first cavities and a plurality of second cavities by a plurality of vertically arranged partitions, the first cavity and the second cavity are arranged adjacent to each other in sequence, a plurality of first cavities are evenly spaced in the circumferential direction, and a plurality of second cavities are evenly spaced in the circumferential direction; a first telescopic mechanism 6 is arranged in each first cavity, the fixed end of the first telescopic mechanism is fixedly connected to the annular box body 4, the protruding end faces the center body 2 and is connected to a roller assembly 5, the roller assembly includes a support frame, a wheel axle and The roller, one end of the support frame is fixedly connected to the protruding end of the first telescopic mechanism, and the U-shaped open end of the other end is installed with a wheel axle, and the roller is installed on the wheel axle through a bearing. The first telescopic mechanism moves toward the center of the center body through the protruding end to push the roller of the roller assembly to be pressed against the outer circumferential surface of the center body; a second telescopic mechanism 10 is arranged in each second cavity, the fixed end of the second telescopic mechanism is fixedly connected to the annular box body 4, the protruding end protrudes out of the annular box body and is movably connected with an arc-shaped shoe plate 11, and the second telescopic mechanism moves outward in the radial direction through the protruding end to push the arc-shaped shoe plate to be supported tightly on the well wall; the inner side of the arc-shaped shoe plate is provided with a connecting groove, and the connecting part of the protruding end of the first telescopic mechanism is rotatably matched and arranged in the connecting groove, and the connecting part and the groove wall of the connecting groove are rotatably connected through a pin shaft, and a spring is installed between the connecting part and the connecting groove; a longitudinal through-channel 12 is opened in the center of the center body 2 as a channel for discharging mud generated by drilling.

[0022] The distance between the inner ring surface of the annular box and the outer wall of the convex ring is greater than or equal to 10 mm and less than or equal to the maximum stroke of the first telescopic mechanism 6 .

[0023] The top and bottom of the central body 2 are provided with an upper flange 1 and a lower flange 8 respectively, and the upper flange and the lower flange are coaxially arranged with the central body, connected with the drill pipe through the upper flange, and connected with the drilling tool through the lower flange.

[0024] A plurality of measuring cylinders 9 are evenly spaced and distributed along the circumferential direction inside the annular box body 4. The eccentric distance of the center body is measured by the measuring cylinders, and then the telescopic amounts of a plurality of first telescopic mechanisms 6 are adjusted simultaneously to achieve centering and ensure the verticality of drilling.

[0025] like Figure 4As shown, two symmetrically distributed or several evenly spaced limit blocks 13 are provided on the inner side of the top of the annular box body 4 near the convex ring 3 of the center body to prevent the annular box body from being separated from the convex ring of the center body during the upward movement.

[0026] The self-correcting forced guide of the drilling tool of the present invention has the following working process: when working, firstly, a plurality of second telescopic mechanisms 10 are extended synchronously, so that a plurality of arc-shaped shoe plates 11 are tightly supported on the well wall, and the extension length of the second telescopic mechanism is determined according to the diameter of the wellbore, and then the extended end of the first telescopic mechanism 6 pushes the roller assembly 5, and the rolling surface of the roller assembly is pressed on the outer circle of the center body. At this time, the center body rotates together with the drilling tool system, and the roller of the roller assembly rotates. As the drilling tool system drills downward, the roller assembly and the center body slide relative to each other. When the highest position is reached, Figure 3 As shown, the extended end of the first telescopic mechanism 6 is retracted, and the drilling tool system is pulled upward by a stroke height. When it reaches the initial position, the annular support 7 supports the annular box 4, and the extended end of the second telescopic mechanism 10 retracts the arc shoe plate 11, and the drilling tool system moves down to the drilling surface, starting a new cycle.

[0027] like Figure 5 As shown, the present invention also includes a self-correcting forced guide group for drilling tools, which is composed of the above-mentioned two self-correcting forced guides, the bottom of the center body of the first self-correcting forced guide 14 located at the upper part and the top of the center body of the second self-correcting forced guide 16 located at the lower part are connected by a flange, and the bottom of the annular box body of the first self-correcting forced guide and the top of the annular box body of the second self-correcting forced guide are connected by a connecting sleeve 15. There is a certain distance between the inner wall of the connecting sleeve and the center body, and this distance meets the conditions: it is greater than the maximum diameter of the flange connecting the two, and is less than the diameter of the circumference of several arc-shaped boot plates. During operation, the connecting sleeve 15 moves up and down with the annular box body 4. Compared with a single self-correcting forced guide, this self-correcting forced guide group is more stable and has a better guiding effect.

[0028] The self-correcting forced guide of the drilling tool of the present invention can adapt to the construction of wells with different diameters, and the diameter change is achieved by the extension and retraction of the first telescopic mechanism.

[0029] In the present invention, the first telescopic mechanism and the second telescopic mechanism both adopt hydraulic cylinders or air cylinders.

[0030] The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Without departing from the spirit and scope of the present invention, all equivalent changes and modifications made within the scope of the patent application of the present invention shall fall within the scope of patent protection of the present invention.

Claims

1. A self-correcting forced guide for a drilling tool, characterized by: It includes a cylindrical center body, a coaxial convex ring extending axially from the middle and lower part of the outer wall of the center body, an annular box body is sleeved on the outside of the convex ring, and there is a certain distance between the inner ring surface of the annular box body and the outer wall of the convex ring, an annular support is installed on the outside of the convex ring, and the annular support is located below the annular box body; the inside of the annular box body is divided into a plurality of first cavities and a plurality of second cavities by a plurality of vertically arranged partitions, the first cavity and the second cavity are arranged adjacent to each other in sequence, a plurality of first cavities are evenly spaced in the circumferential direction, and a plurality of second cavities are evenly spaced in the circumferential direction, each first cavity is provided with a first telescopic mechanism, the fixed end of the first telescopic mechanism is fixedly connected to the annular box body, and extends out The end faces the center body and is connected to the roller assembly, and a second telescopic mechanism is arranged in each second cavity, the fixed end of the second telescopic mechanism is fixedly connected to the annular box body, and the protruding end protrudes out of the annular box body and is movably connected to an arc-shaped shoe plate; a longitudinal channel is opened in the center of the center body, and an upper flange and a lower flange are respectively arranged on the top and bottom of the center body, and the upper flange and the lower flange are coaxially arranged with the center body, connected to the drill pipe through the upper flange, and connected to the drill tool through the lower flange; a plurality of measuring cylinders evenly distributed in the circumferential direction are arranged inside the annular box body, and two symmetrically distributed or a plurality of limit blocks evenly distributed in the circumferential direction are arranged at the convex ring on the inner side of the top of the annular box body near the center body.

2. The self-correcting forced guider of the drilling tool according to claim 1 is characterized in that: The first telescopic mechanism and the second telescopic mechanism both adopt hydraulic cylinders or air cylinders.

3. A self-correcting forced guider group for a drilling tool, comprising the self-correcting forced guider for a drilling tool according to claim 1 or 2, characterized in that: It is composed of two self-correcting forced guides connected together. The bottom of the central body of the first self-correcting forced guide located at the upper part is connected to the top of the central body of the second self-correcting forced guide located at the lower part through a flange. The bottom of the annular box body of the first self-correcting forced guide and the top of the annular box body of the second self-correcting forced guide are connected through a connecting sleeve, and there is a certain distance between the inner wall of the connecting sleeve and the central body.

4. The self-correcting forced guider assembly of the drilling tool according to claim 3 is characterized by: The distance between the inner wall of the connecting sleeve and the central body is greater than the maximum diameter of the flange connecting the two and less than the diameter of the circumference of the plurality of arc-shaped shoe plates.

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