阅读说明：本技术 可钻式套管钻井钻头 (Drillable casing drill bit ) 是由 郭超 蒋海涛 田晓勇 梁国红 陶松龄 张丽华 梁红梅 于 2019-10-18 设计创作，主要内容包括：本发明涉及可钻式套管钻井钻头,包括本体、承扭环、可钻芯体,本体为两端贯通结构,本体一端设有套管接口,本体另一端通过偏梯扣螺纹连接有可钻芯体,且本体与可钻芯体通过侧壁安装若干个销钉进行径向固定,可钻芯体套管螺纹上端面顶在承扭环一侧端面上,承扭环另一侧端面顶在本体内孔台阶处,可钻芯体底部安装有若干个可钻水眼,本体与可钻芯体连接端的本体和可钻芯体上分别设有本体刀翼和可钻芯体刀翼,本体刀翼和可钻芯体刀翼为整体结构,整体刀翼数量为3-10个,且本体刀翼和可钻芯体刀翼上焊接PDC齿。本发明可适应松软地层到中硬地层钻井；当钻达设计井深后直接固井,然后采用常规钻井钻头钻穿钻头芯部,便可进行下一开钻井施工。(The invention relates to a drillable casing drilling bit, which comprises a body, a torsion ring and a drillable core body, wherein the body is of a structure with two through ends, one end of the body is provided with a casing joint, the other end of the body is connected with the drillable core body through buttress threads, the body and the drillable core body are radially fixed through a plurality of pins arranged on the side wall, the upper end surface of the casing thread of the drillable core body is propped against the end surface of one side of the torsion ring, the end surface of the other side of the torsion ring is propped against the step of an inner hole of the body, the bottom of the drillable core body is provided with a plurality of drillable water holes, body blades and drillable core body blades are respectively arranged on the body and the drillable core body at the connecting end of the body and the drillable core body, the body blades and the drillable core body blades are of an integral structure, the number of the. The invention can be suitable for drilling from soft stratum to medium-hard stratum; after the well is drilled to the designed depth, the well is directly fixed, and then the conventional drilling bit is adopted to drill through the core part of the bit, so that the next drilling construction can be carried out.)

1. A drillable casing drilling bit, characterized by: including the body, hold the torque ring, can bore the core, the body is both ends through structure, body one end is equipped with the bushing mouth, the body other end has the drillable core through buttress knot threaded connection, just the body carries out radial fixed with drillable core through a plurality of pin of lateral wall installation, drillable core bushing thread up end top hold on the torque ring one side end face, hold torque ring another side end face top at body hole step department, drillable core bottom is installed a plurality of and is bored the hydrophthalmia, be equipped with the body wing respectively on the body of body and drillable core link and the drillable core wing, the body wing is overall structure with the drillable core wing, and whole wing quantity is 3-10, just weld the PDC tooth on body wing and the drillable core wing.

2. The drillable casing drilling bit of claim 1, wherein: the drillable water hole comprises an upper sleeve body, a ceramic water hole and a lower sleeve body, wherein the outer side wall of the upper sleeve body and the outer side wall of the lower sleeve body are both provided with sealing ring grooves, the ceramic water hole is of a hollow annular structure, the longitudinal section of the ceramic water hole is of a convex structure, the inner side wall of the upper sleeve body and the inner side wall of the lower sleeve body are provided with a first step and a second step which are matched with the ceramic water hole structure, one end of the upper sleeve body is in close contact with one end of the lower sleeve body, the ceramic water hole is arranged in a cavity formed by the upper sleeve body and the lower sleeve body, and the side wall and the bottom end of the ceramic water hole are limited through the first step and.

3. The drillable casing drilling bit of claim 2, wherein: the upper sleeve body and the lower sleeve body are made of free-cutting copper alloy.

4. The drillable casing drilling bit of claim 2, wherein: the end of the lower sleeve body, which is in contact with the upper sleeve body, is provided with a groove, and a gasket can be placed in the groove.

5. The drillable casing drilling bit of claim 2, wherein: the upper sleeve body is provided with a straight groove for installation at the non-contact end with the lower sleeve body.

6. The drillable casing drilling bit of claim 2, wherein: the end surfaces of the non-contact ends of the lower sleeve body and the upper sleeve body are provided with a plurality of mounting holes.

7. The drillable casing drilling bit of claim 2, wherein: and a sealing ring groove is also arranged on the inner side wall of the upper sleeve body.

8. The drillable casing drilling bit of claim 2, wherein: and the outer side walls of the lower sleeve body and the upper sleeve body are respectively provided with a mounting thread.

9. The drillable casing drilling bit of any one of claims 1 to 8, wherein: the sleeve connector at one end of the body is a sleeve thread female buckle.

Technical Field

The invention belongs to the technical field of petroleum drilling equipment and tools, and particularly relates to a drillable casing drilling bit.

Background

The casing drilling is to connect the drill bit with the lower part of the casing and to drive the drill bit to drill by the torque transmitted by the casing. When the designed depth is drilled, the casing is left in the well for cementing. Existing casing is divided into retrievable and drillable drill bits. The well drilling with the removable drill bit can be performed after the removable drill bit is removed before well cementation, so that the operation is complicated, the time is wasted before well cementation, and the well cementation quality is easily influenced. After the drillable drill bit is used for drilling the well to reach the designed well depth, the drill bit is not taken for direct well cementation, and when the well cementation is finished, the next drill bit is directly used for drilling through the drillable drill bit and the cement plug for next drilling operation, so that the operation is convenient and reliable. The core of the drillable drill bit is generally made of aluminum alloy which is easy to drill through, but the aluminum alloy has a low melting point, cannot be used for brazing PDC teeth by silver welding rods, and can only be embedded with polycrystalline diamond sheets, so that the drillable drill bit can only be applied to soft strata, and the application range of the drillable drill bit for casing drilling is limited.

Therefore, based on the problems, the drill bit special for the drillable casing drilling is provided, is connected to the lower part of the casing and can adapt to drilling from a soft stratum to a medium-hard stratum; when the well is directly fixed after the designed well depth is reached, then the conventional drilling bit is adopted to drill through the core part of the drillable casing bit, and then the next drilling construction can be carried out, thus having important practical significance.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a special drill bit for drilling a drillable casing, which is connected to the lower part of a casing and is suitable for drilling from a soft stratum to a medium-hard stratum; after the well is drilled to the designed depth, the well is fixed directly, and then the conventional drilling bit is used to drill through the core part of the drillable casing bit, so that the next drilling construction can be carried out.

The technical problem to be solved by the invention is realized by adopting the following technical scheme:

drillable casing drilling bit, including the body, hold the torque ring, can bore the core, the body is both ends through structure, body one end is equipped with the casing pipe interface, the body other end has the drillable core through buttress knot threaded connection, just the body carries out radial fixed through a plurality of pin of lateral wall installation with the drillable core, drillable core casing screw thread up end top hold on the torque ring one side end face, hold torque ring other side end face top at body hole step department, drillable core bottom is installed a plurality of and is bored the water hole, be equipped with the body wing and the drillable core wing on the body of body and drillable core link and the drillable core respectively, the body wing is overall structure with the drillable core wing, and overall wing quantity is 3-10, just weld the tooth on body wing and the drillable core wing.

Further, the water hole that can bore includes the upper portion cover body, ceramic water hole, the lower part cover body, all be equipped with the sealing washer slot on the lateral wall of the upper portion cover body, the lower part cover body, ceramic water hole is cavity annular structure, and its vertical section is "protruding" style of calligraphy structure, be equipped with on the upper portion cover body, the internal lateral wall of lower part cover with ceramic water hole structure assorted first step, second step, the upper portion cover body one end and the lower part cover body one end in close contact with, just ceramic water hole cover is established in the cavity that the upper portion cover body formed with the lower part cover body to through first step, second step with lateral wall, the bottom of ceramic water hole carry on spacingly.

Furthermore, the upper sleeve body and the lower sleeve body are made of free-cutting copper alloy.

Furthermore, a groove is formed in one end, in contact with the upper sleeve body, of the lower sleeve body, and a gasket can be placed in the groove.

Furthermore, a straight groove for installation is arranged on the non-contact end of the upper sleeve body and the lower sleeve body.

Furthermore, a plurality of mounting holes are formed in the end face of the non-contact end of the lower sleeve body and the upper sleeve body.

Furthermore, a sealing ring groove is also arranged on the inner side wall of the upper sleeve body.

Furthermore, the outer side walls of the lower sleeve body and the upper sleeve body are respectively provided with mounting threads.

Furthermore, the sleeve connector at one end of the body is a sleeve thread female buckle. The clear advantages and positive effects are:

1. the body and the drillable core body at the connecting end of the body and the drillable core body are respectively provided with the body blade and the drillable core body blade, the body blade and the drillable core body blade are of an integral structure, the number of the integral blades is 3-10, the body blade and the drillable core body blade can be applied to drilling in soft strata and drilling in hard strata, and PDC teeth are welded on the body blade and the drillable core body blade, compared with the prior art that the drill bit can only be embedded with polycrystalline diamond chips, the application range of the casing drilling drillable drill bit is expanded;

2. the drillable water hole is arranged in the drill bit, and the drillable water hole is easy to drill and remove and is wear-resistant; the upper sleeve body and the lower sleeve body are made of free-cutting copper alloy outside, and the free-cutting copper alloy is easy to drill and remove; the ceramic water hole is fixed inside, has high melting point, high hardness, high strength, wear resistance and good chemical corrosion resistance, but has large brittleness and poor impact resistance, and is easy to break when a drill bit is drilled out, so that the drill bit and other fragments are carried by the drilling fluid and return to the ground;

3. the invention directly fixes the well after the drill bit drills to the designed well depth, then the conventional drilling drill bit is adopted to drill through the core part of the drillable casing drill bit and the drillable water hole, and then the next drilling construction can be carried out.

Drawings

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present invention. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.

FIG. 1 is a schematic cross-sectional view of a drillable casing drilling bit configuration provided by an embodiment of the present invention;

FIG. 2 is a bottom view of a drillable cased drill bit provided by an embodiment of the present invention;

FIG. 3 is a side view of a drillable casing drill bit provided by an embodiment of the present invention;

FIG. 4 is a schematic illustration of a torque ring of a drillable casing drill bit provided by an embodiment of the present invention;

FIG. 5 is a cross-sectional view of a configuration of a drillable water-hole provided by an embodiment of the present invention;

FIG. 6 is a cross-sectional view of an upper housing body for a drillable water hole according to an embodiment of the present invention;

FIG. 7 is a cross-sectional view of a configuration of a lower housing body for a drillable water-hole according to an embodiment of the present invention;

FIG. 8 is a cross-sectional view of a configuration of a ceramic port that may be drilled into a port in accordance with an embodiment of the present invention;

Detailed Description

First, it should be noted that the specific structures, features, advantages, etc. of the present invention will be specifically described below by way of example, but all the descriptions are for illustrative purposes only and should not be construed as limiting the present invention in any way. Furthermore, any single feature described or implicit in any embodiment or any single feature shown or implicit in any drawing may still be combined or subtracted between any of the features (or equivalents thereof) to obtain still further embodiments of the invention that may not be directly mentioned herein. In addition, for the sake of simplicity, the same or similar features may be indicated in only one place in the same drawing.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The present invention will be specifically described with reference to fig. 1 to 8.