CN221002625U - High-efficiency coring bit for broken stratum - Google Patents

Abstract

The utility model discloses a high-efficiency coring bit for broken stratum, comprising: the self-rotating coring bit comprises a coring bit body, a coring bit blade, plane circular teeth, galloping teeth and sharp teeth, wherein the coring bit body can rotate, the coring bit blade is arranged on the coring bit body, the coring bit blade is positioned outside the lower end of the coring bit body, the outside of the coring bit blade is provided with an outer side face, a transition face and an outer end face, the plane circular teeth are embedded in the outer side face of the outside of the coring bit blade, the galloping teeth are embedded in the transition face of the outside of the coring bit blade, and the sharp teeth are arranged on the outer end face of the outside of the coring bit blade, so that the self-rotating coring bit has the beneficial effects that: the rotation of the Benz tooth enables the blade of the coring bit to stably drill into the stratum, the efficiency of the coring bit in drilling the stratum is improved, the Benz tooth is a polycrystalline diamond compact, and the coring bit is not easy to damage.

Description

High-efficiency coring bit for broken stratum

Technical Field

The utility model relates to the technical field of petroleum and natural gas drilling of broken stratums, in particular to a high-efficiency coring bit for broken stratums.

Background

Drilling coring is a direct way of obtaining an original stratum sample, an original core sample is obtained from a target stratum through a coring tool, and then the stratum characteristics and oil and gas resource reserves information are known through analyzing the obtained original core sample through coring, so that the coring yield is an important standard for evaluating the coring effect. The broken stratum rock core is hard and brittle to be broken, the rock core obtained from the broken stratum is easy to be not columnar and is in an irregular and breakable sharp rock block, the rock stratum is broken by the disturbance of the drill bit to the rock stratum in the drilling process, and meanwhile, severe fluctuation torque is generated to the coring tool, especially, a rock core barrel of the double-barrel single-action coring tool is hung in the coring tool through a bearing on the upper part, the rock core barrel is easy to be unstable and even deform, the broken rock core in the rock core barrel enters the rock core clamping mechanism to cause core blockage, and the rock core which continues to drill cannot smoothly enter the rock core barrel.

In addition, in the coring drilling process, the circulation of the drilling fluid in the well is required to be continuously carried out so as to bring out rock fragments generated by drilling, the existing common coring bit structure leads the drilling fluid to be easily contacted with a core sample, pollution is caused to the original rock stratum information of the core sample, and the core pollution problem is particularly serious in an unstable environment of breaking a stratum.

The formation of a certain region in northwest is dense, extremely hard and weakly abrasive, hard and brittle formations and soft elastic and resistive formations are mutually layered, the conventional coring tool bit is difficult to adapt to two lithologies at the same time, the conventional sharp-type coring bit is suitable for soft formation drilling, but the bit is easy to damage due to insufficient impact resistance to the hard and brittle formations; conventional circular composite tooth drill bits are suitable for drilling hard formations, have strong impact resistance, but are easy to "slip" when facing extremely hard and weakly abrasive formations, the drill bit cannot effectively grind the formations, and circular composite teeth are also difficult to bite for soft, elastic formations. Especially in the interbedded stratum of certain area in northwest, the drilling efficiency of the two common drill bits is low, the drill bits are easy to damage, and the drill bit coring mode is not suitable for replacement, the coring operation in the area in the past does not obtain higher single core harvest quantity, and the problems of serious soft and hard stratum intergrinding and damage to the original data of the stratum are accompanied, meanwhile, the instability of the core barrel of the coring tool is further caused, the efficiency of the coring tool is low, the non-production drilling time and the non-production cost are greatly increased, and therefore, the technical breakthrough is urgently needed.

Disclosure of utility model

The utility model aims to provide a high-efficiency coring bit aiming at broken stratum, wherein the coring bit blade rotates, the Benz tooth enables the coring bit blade to stably drill into the stratum, the efficiency of the coring bit in drilling the stratum is improved, the Benz tooth is a polycrystalline diamond compact, and the coring bit is not easy to damage.

The utility model is realized by the following technical scheme:

A high efficiency coring bit for fracturing a subterranean formation, comprising:

the core bit body can self-rotate;

The coring bit blade is arranged on the coring bit body, and is positioned outside one end of the coring bit body, and the outside of the coring bit blade is provided with an outer side face, a transition face and an outer end face;

A planar circular tooth embedded in the outer side of the core bit blade exterior;

a Benz tooth embedded in the transition surface outside of the core bit blade;

The sharp teeth are arranged on the outer end face outside the blade of the coring bit;

The coring bit body rotates to drive the coring bit blade to rotate, and the Benz teeth on the transition surface enable the coring bit blade to stably drill into the stratum.

Optionally, the Benz teeth are special PDC teeth, the Benz teeth are made of polycrystalline diamond compact, and the Benz teeth are located between the plane circular teeth and the Benz teeth.

Optionally, the height of the Benz tooth extending out of the transition surface is higher than the height of the plane circular tooth extending out of the outer side surface, and the height of the Benz tooth extending out of the transition surface is 1-2mm larger than the height of the plane circular tooth extending out of the outer side surface.

Optionally, the height of the sharp teeth extending from the outer end surface of the blade of the coring bit is greater than the height of the Benz teeth extending from the transition surface and the height of the planar circular teeth extending from the outer side surface.

Optionally, the number of the pointed teeth is three, and the pointed teeth are arranged in a circumferential array along the central line of the coring bit body.

Optionally, the plane circular teeth in the outer side surface outside the blade of the coring bit are gauge protection teeth, and the plane circular teeth can be attached to the well wall.

Optionally, a flow channel is formed in the core bit blade, the flow channel is a blind flow channel, and the flow channel is led into the core bit body from the core bit blade.

Optionally, a through channel is formed in the coring bit body, a step is formed in the through channel, and an inlet of the flow channel is formed in the step.

Optionally, the through channel has a first through channel and a second through channel, and an inner diameter of the first through channel is larger than an inner diameter of the second through channel.

Optionally, an included angle between the center line of the flow channel and the center line of the coring bit body is within a range of 30 ° -60 °.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

1. The self-rotation type coring bit body can rotate, the coring bit blade is arranged on the coring bit body, the coring bit blade is positioned outside the lower end of the coring bit body, the outside of the coring bit blade is provided with an outer side face, a transition face and an outer end face, the plane circular teeth are embedded in the outer side face of the outside of the coring bit blade, the galloping teeth are embedded in the transition face of the outside of the coring bit blade, the sharp teeth are arranged on the outer end face of the outside of the coring bit blade, the coring bit body is rotated to drive the coring bit blade to rotate, and the sequence of the coring bit body during drilling is as follows: the inventive PDC drill bit adopts the Benz tooth and the planar circular tooth as cutting teeth to be specially arranged, and the Benz tooth has the impact resistance of the planar circular tooth and the aggressiveness of the tines, and the Benz tooth is well applied in heterogeneous stratum and hard stratum, thus the bit has high impact resistance and drilling capability when facing extremely hard and weak abrasive hard and brittle stratum, compared with the conventional tines and Benz tooth, the energy consumed per unit crushing volume of each dip angle is far lower than that of the conventional tines, the bit can effectively eat soft elastic stratum, the aggressiveness is higher than that of the planar circular tooth, and the Benz tooth can smoothly drill the stratum.

2. The height of the sharp teeth extending out of the outer end surface is larger than the height of the Benz teeth extending out of the transition surface and the height of the plane circular teeth extending out of the outer side surface, so that the sharp teeth firstly contact the stratum.

3. The height of the galloping teeth extending out of the transition surface is 1-2mm greater than the height of the plane circular teeth extending out of the outer side surface, so that the galloping teeth can be in limited contact with the stratum and can effectively cut and destroy extremely hard or soft elastic resistance stratum.

4. The plane circular teeth are finally attached to the well wall, so that the plane circular teeth can normally penetrate into a stratum, wherein the plane circular teeth in the outer side face of the outer part of the blade of the coring bit are gauge-protecting teeth, and the outer side face of the blade of the coring bit is embedded into the plane circular teeth, so that the well wall is worn on the blade of the coring bit or the plane circular teeth when the blade of the coring bit drills in a coring mode.

5. The flow channel is arranged in the blade of the coring bit, the inlet of the flow channel is arranged on the step in the body of the coring bit, after the coring tool or the coring bit is assembled, the through channel is internally provided with the core barrel, the inner peripheral wall of the second through channel is contacted with the outer peripheral wall of the core barrel, the core barrel is internally provided with the core, the outer peripheral wall of the core barrel, the step and the first through channel form a circular space, the circular space guides drilling fluid to enter the flow channel, and the flow channel can not only flush the cuttings carried at the bottom of the well, but also prevent the core from being polluted by direct flushing of the acquired core barrel

Drawings

The accompanying drawings, which are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model. In the drawings:

FIG. 1 is a schematic view of a cross-sectional structure of the present utility model in a front view;

in the drawings, the reference numerals and corresponding part names:

1-core bit body, 2-core bit blade, 3-plane circular tooth, 4-galloping tooth, 5-sharp tooth, 11-runner, 12-step, 13-through channel, 131-first through channel, 132-second through channel, 21-lateral surface, 22-transition surface, 23-lateral surface.

Detailed Description

For the purpose of making apparent the objects, technical solutions and advantages of the present utility model, the present utility model will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present utility model and the descriptions thereof are for illustrating the present utility model only and are not to be construed as limiting the present utility model.

In the description of the present utility model, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present utility model.

The terms "first," "second," and the like as used herein are used solely for clarity of description and to distinguish one from another and are not intended to limit any order or emphasize importance, etc. In addition, the term "coupled" as used herein may be directly coupled or indirectly coupled via other components, unless otherwise indicated.

Example 1

As shown in fig. 1, the present embodiment provides a high-efficiency coring bit for breaking a formation, including: the self-rotating coring bit comprises a coring bit body 1, a coring bit blade 2, plane circular teeth 3, a galloping tooth 4 and sharp teeth 5, wherein the coring bit body 1 can self-rotate, the coring bit blade 2 is arranged on the coring bit body 1, the coring bit blade 2 is positioned outside the lower end of the coring bit body 1, the outside of the coring bit blade 2 is provided with an outer side surface 21, a transition surface 22 and an outer end surface 23, the plane circular teeth 3 are embedded in the outer side surface 21 outside the coring bit blade 2, the galloping tooth 4 is embedded in the transition surface 22 outside the coring bit blade 2, and the sharp teeth 5 are arranged on the outer end surface 23 outside the coring bit blade 2;

The core bit blade 2 is driven to rotate by the rotation of the core bit body 1, and the Benz teeth 4 on the transition surface 22 enable the core bit blade 2 to smoothly drill into a stratum.

The utility model adopts the Benz tooth 4 and the plane circular tooth 3 as cutting teeth to serve as PDC (polycrystalline diamond compact) drill bit with special layout, the Benz tooth 4 is a special PDC tooth, and has the impact resistance of the plane circular tooth 3 and the aggressiveness of the sharp teeth 5, and the Benz tooth 4 is well applied in heterogeneous stratum and hard stratum, so that the Benz tooth 4 has high impact resistance and drilling capability when facing extremely hard and weakly abrasive hard and brittle stratum, and compared with the conventional sharp teeth and Benz tooth, the energy consumed by rock stratum with unit crushing volume at each inclination angle is far lower than that of the conventional sharp teeth, and the aggressiveness of the PDC tooth is higher than that of the plane circular tooth.

Specifically, the Benz teeth 4 are shaped PDC teeth, and the Benz teeth 4 are positioned between the planar circular teeth 3 and the Benz teeth 4.

The PDC teeth are distributed by adopting the staggered intervals of the Benz teeth 4, the plane circular teeth 3 and the sharp teeth 5, and the core bit body 1 is drilled in the following sequence: the contact stratum, namely the sharp teeth 5 are in contact with the stratum, the Benz teeth 4 are in limited contact with the stratum and effectively cut and destroy the surface of the extremely hard or soft elastic stratum, then the plane circular teeth 3 normally eat the stratum, the stratum is crushed at one stage, small rock scraps with uniform size are generated by different types of strata, the stratum cannot be crushed into large crushed cores, the rock core crushing machine is suitable for the stratum with complex crushing and the stratum with different lithology interbedded layers, and meanwhile, the reactive torque of the stratum to the drill bit is weakened, so that the damage and tooth breakage risks are reduced.

The height of the tines 5 extending from the outer face 23 of the core bit blade 2 is greater than the height of the Benz teeth 4 extending from the transition face 22 and the height of the planar circular teeth 3 extending from said outer face 21 in order to have the tines 5 first contact the formation.

The height of the Benz tooth 4 extending out of the transition surface 22 is higher than the height of the plane circular tooth 3 extending out of the outer side surface 21, and the height of the Benz tooth 4 extending out of the transition surface 22 is 1-2mm larger than the height of the plane circular tooth 3 extending out of the outer side surface 21, so that the Benz tooth 4 can be in limited contact with the stratum and effectively cut and destroy the extremely hard or soft elastic stratum.

The plane circular teeth 3 are finally attached to the well wall, so that the plane circular teeth 3 can normally penetrate into a stratum, wherein the plane circular teeth 3 in the outer side surface 21 of the outer part of the coring bit blade 2 are gauge-protecting teeth, and the outer side surface 21 of the coring bit blade 2 is embedded into the plane circular teeth 3, so that the well wall is worn on the coring bit blade 2 or the plane circular teeth 3 when the coring bit blade 2 performs coring drilling.

In addition, three sharp teeth 5 are arranged on the bottom end face or the outer end face 23 of the coring bit blade 2, the sharp teeth 5 are arranged in a circumferential array along the central line of the coring bit body 1, the three sharp teeth 5 are embedded into the coring bit blade 2 to a depth higher than other teeth, and the stratum contacted later in the coring drilling process is suitable for providing higher aggressiveness when encountering a bullet-resistant stratum.

Example 2

Based on embodiment 1, as shown in fig. 1, a flow passage 11 is opened in a core bit blade 2, the flow passage 11 leads into a core bit body 1 from the core bit blade 2, a through passage 13 is opened in the core bit body 1, a step 12 is provided in the through passage 13, and an inlet of the flow passage 11 is opened on the step 12.

The through passage 13 has a first through passage 131 and a second through passage 132, the inner diameter of the first through passage 131 is larger than the inner diameter of the second through passage 132, and an included angle between the center line of the flow passage 11 and the center line of the coring bit body 1 is in the range of 30 ° to 60 °.

Further, the flow channel 11 is disposed in the core bit blade 2, the flow channel 11 forms a certain included angle with the center line of the core bit body 1, the inlet of the flow channel 11 is disposed on the step 12 in the core bit body 1, the through diameter or the inner diameter of the first through channel 131 above the step 12 is larger than the through diameter or the inner diameter of the second through channel 132 above the step 12, after the core bit or the core bit is assembled, the core barrel is disposed in the through channel 13, the inner peripheral wall of the second through channel 132 contacts with the outer peripheral wall of the core barrel, the core is disposed in the core barrel, the outer peripheral wall of the core barrel, the step 12 and the first through channel 131 form a circular space, the circular space guides drilling fluid to enter the flow channel 11, and the inlet of the flow channel 11 is located on the inner plane of the core bit blade 2, namely the plane of the step 12, or the inlet of the flow channel 11 is located on the transition plane between the step 12 of the core bit blade 2 and the inner peripheral wall of the first through channel 131, and the core barrel is flushed by the flow channel 11, and the core barrel is prevented from directly flushing the core barrel.

Example 3

Based on the embodiment 1-2, the utility model drives the core bit blade 2 to rotate by the rotation of the core bit body 1, and the sequence of the core bit body 1 during drilling is as follows: the sharp teeth 5 are in contact with the stratum, the Benz teeth 4 are in limited contact with the stratum, then the plane circular teeth 3 normally eat the stratum, the stratum is crushed at one stage, small rock scraps with uniform sizes are generated on different types of strata, the stratum is not crushed into large broken cores, the rock core breaking device is suitable for the stratum which is crushed in a complex mode and the stratum with different lithology interbedded layers, the reactive torque of the stratum to the drill bit is weakened, and the damage and tooth breakage risks are reduced.

The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the scope of the utility model, but to limit the utility model to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the utility model are intended to be included within the scope of the utility model.

Claims (10)

1. A high efficiency coring bit for fracturing a subterranean formation, comprising:

A coring bit body (1), the coring bit body (1) itself being capable of autorotation;

The coring bit blade (2) is arranged on the coring bit body (1), the coring bit blade (2) is positioned outside one end of the coring bit body (1), and the outside of the coring bit blade (2) is provided with an outer side surface (21), a transition surface (22) and an outer end surface (23);

A planar circular tooth (3), the planar circular tooth (3) being embedded in the outer side (21) of the outside of the core bit blade (2);

-a galloping tooth (4), said galloping tooth (4) being embedded in said transition surface (22) external to said core bit blade (2);

A tine (5), the tine (5) being disposed on the outer end face (23) external to the core bit blade (2);

The coring bit body (1) is rotated to drive the coring bit blade (2) to rotate, and the Benz teeth (4) on the transition surface (22) enable the coring bit blade (2) to stably drill into a stratum.

2. The efficient coring bit for broken strata according to claim 1, wherein the courser teeth (4) are shaped PDC teeth, the material of the courser teeth (4) is polycrystalline diamond compact, and the courser teeth (4) are located between the planar circular teeth (3) and the courser teeth (4).

3. A high efficiency coring bit for a broken formation according to claim 1, wherein the height of said courser teeth (4) protruding from said transition surface (22) is higher than the height of said planar circular teeth (3) protruding from said outer side surface (21), and the height of said courser teeth (4) protruding from said transition surface (22) is 1-2mm greater than the height of said planar circular teeth (3) protruding from said outer side surface (21).

4. A high efficiency core drill for broken formations according to claim 1, characterized in that the height of the tines (5) protruding from the outer face (23) of the core drill bit blade (2) is greater than the height of the courser teeth (4) protruding from the transition face (22) and the height of the planar circular teeth (3) protruding from the outer face (21).

5. A high efficiency core drill bit for broken formations according to claim 4, wherein the number of tines (5) is three, the tines (5) being arranged in a circumferential array along the centre line of the core drill bit body (1).

6. A high efficiency core bit for broken formations according to any of claims 1 or 4, wherein said planar circular teeth (3) in said outer side (21) of said core bit blades (2) are gage teeth, planar circular teeth (3) being conformable to the borehole wall.

7. The efficient coring bit for broken formations according to claim 1, wherein a runner (11) is opened in the coring bit blade (2), the runner (11) is a blind runner, and the runner (11) is led into the coring bit body (1) from the inside of the coring bit blade (2).

8. The efficient coring bit for broken strata according to claim 7, wherein a through passage (13) is formed in the coring bit body (1), a step (12) is formed in the through passage (13), and an inlet of the flow passage (11) is formed on the step (12).

9. A high efficiency coring bit for a broken formation according to claim 8, wherein said through passage (13) has a first through passage (131) and a second through passage (132), said first through passage (131) having an inner diameter greater than an inner diameter of the second through passage (132).

10. A high efficiency core drill for fractured formations according to claim 7, wherein the centerline of the flow passage (11) is within the range of 30 ° -60 ° from the centerline of the core drill body (1).