Long spiral gauge protection negative pressure forward inclined tooth PDC (Polycrystalline Diamond Compact) drill bit

Abstract

The utility model relates to a long-spiral gauge-protection negative-pressure forward-inclined-tooth PDC (polycrystalline diamond compact) drill bit which comprises a drill bit handle. The drill bit head part is supported on the drill bit handle part; the drill bit head comprises a drill bit body, a plurality of long blades, a plurality of short blades, a plurality of nozzles and forward-inclined PDC cutting teeth. The long blades and the short blades are arranged on the drill bit body at intervals in the circumferential direction of the drill bit body. One end of each long blade is connected with the end part of the drill bit body, and each long blade is spirally arranged on the outer wall of the drill bit body; a blade chip groove is formed between the long blade and the short blade; gauge protection chip grooves are formed among the long blades; and the nozzles are respectively arranged in the chip grooves of the cutter wings. When the long-spiral gauge protection negative-pressure forward-inclined-tooth PDC drill bit works, local negative pressure is generated through rotation, the forward-inclined PDC cutting teeth are in a plowing mode, upward returning of rock debris is accelerated, the well bottom cleaning effect is improved, bit balling is prevented, and the well bottom hold-down effect is reduced; and meanwhile, the plow PDC cutting teeth enable the rock debris to rapidly enter the bottom of the well, so that the mechanical drilling speed is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of oil drilling, in particular to a long spiral diameter-protected negative pressure forward-inclined tooth PDC drill bit. Background Art

[0002] With the rapid development of new energy, the competitive pressure in the energy industry is increasing, which has brought a huge impact on traditional petrochemical energy. Therefore, increasing the speed and efficiency of oil drilling and controlling costs are one of the key issues currently faced. The drill bit is the most direct rock-breaking tool in oil drilling, which directly affects the mechanical drilling speed and drilling efficiency.

[0003] Traditional PDC drill bits have technical problems:

[0004] 1. When drilling into the formation quickly, the cuttings at the bottom of the well are not returned in time, which can easily cause mud packing on the drill bit; 2. In plastic formations, especially under high-density drilling fluid conditions, the bottom of the well is subjected to high pressure from the drilling fluid column, and the cuttings are affected by the "pressure holding effect" and stick to the bottom of the well, resulting in repeated cutting, which leads to low rock breaking efficiency and slow mechanical drilling speed; 3. Conventional backward-inclined PDC cutting teeth have difficulty breaking rocks in plastic formations, low rock breaking efficiency, and slow mechanical drilling speed. Utility Model Content

[0005] The utility model aims to solve at least one technical problem in the background technology and provide a long spiral diameter-maintaining negative pressure forward-inclined tooth PDC drill bit.

[0006] In order to achieve the above object, the utility model provides a long spiral diameter-protected negative pressure forward-inclined tooth PDC drill bit, comprising:

[0007] Drill bit shank;

[0008] A drill head supported on the drill shank;

[0009] The drill head comprises: a drill body, a plurality of long blades, a plurality of short blades, a plurality of nozzles and forward-inclined PDC cutting teeth;

[0010] The long blade wings and the short blade wings are arranged on the drill body at intervals along the circumference of the drill body;

[0011] One end of each of the long blade wings is connected to the end of the drill body, and each of the long blade wings is spirally arranged on the outer wall of the drill body;

[0012] A blade chip removal groove is provided between the long blade and the short blade;

[0013] There is a diameter-protecting chip removal groove between each of the long blade wings;

[0014] Each of the nozzles is respectively arranged in the blade chip removal groove.

[0015] According to one aspect of the utility model, each of the long blade wings comprises: a blade wing and a long spiral gage guard;

[0016] One end of each blade is connected to the end of the drill body;

[0017] Each of the long spiral gauge guards is respectively connected to the other end of each of the blade wings, and is spirally arranged on the outer wall of the drill body, and the other end thereof extends to the outer wall of the other end of the drill body.

[0018] According to one aspect of the utility model, the drill head comprises three long blade wings, and the long spiral diameter protection of each long blade wing is arranged on the outer wall of the drill body around a circumference of 140-180°.

[0019] According to one aspect of the utility model, the outer diameter of the drill body at a side of the gauge-maintaining chip removal groove away from the blade wing is the same as the outer diameter of the drill shank.

[0020] According to one aspect of the utility model, the forward-inclined PDC cutting teeth are skiving PDC cutting teeth.

[0021] According to the scheme of the utility model, a long spiral diameter-protected negative pressure forward-inclined tooth PDC drill bit comprises: a drill bit shank; a drill bit head supported on the drill bit shank; the drill bit head comprises: a drill bit body, a plurality of long blade wings, a plurality of short blade wings, a plurality of nozzles and forward-inclined PDC cutting teeth; each long blade wing and each short blade wing are arranged on the drill bit body at intervals along the circumference of the drill bit body; one end of each long blade wing is connected at the end of the drill bit body, and each long blade wing is spirally arranged on the outer wall of the drill bit body; a blade wing chip removal groove is provided between the long blade wing and the short blade wing; a diameter-protected chip removal groove is provided between each long blade wing; each nozzle is respectively provided in the blade wing chip removal groove. With such a configuration, the long blade wing and the short blade wing can cooperate with the cuttings, and during the cuttings drilling process, the long blade wing can make the cuttings well wall smoother and the cuttings more efficient and smooth, and then the diameter-protected chip removal groove can further improve the ability to discharge the cuttings and improve the wellbore cleaning effect.

[0022] Each long blade includes: a blade and a long spiral gauge; one end of each blade is connected to the end of the drill body; each long spiral gauge is respectively connected to the other end of each blade, and is spirally arranged on the outer wall of the drill body, and its other end extends to the outer wall of the other end of the drill body. Such an arrangement can make the well wall smoother when drilling cuttings through the long spiral gauge, which is conducive to the smooth drilling process and the smooth discharge of drilling cuttings.

[0023] The drill head includes long blade wings, and the long spiral diameter protection of each long blade wing is arranged on the outer wall of the drill body around a circumference of 140-180°. In this way, the long spiral diameter protection of the three long blade wings can achieve a circumference of 420°-540° coverage on the outer wall of the drill body.

[0024] The outer diameter of the drill body at the side of the gauge-protecting chip removal groove away from the blade wing is the same as the outer diameter of the drill shank.

[0025] The forward-inclined PDC cutting teeth are skiving PDC cutting teeth.

[0026] The utility model provides a long spiral diameter protection negative pressure forward-inclined tooth six-blade PDC drill bit, which achieves 420°-540° circumferential coverage through the long spiral diameter protection with three main blades. When the drill bit is working, it rotates clockwise, and the long spiral diameter protection lifts the mixture of drill cuttings and drilling fluid to rise during the clockwise rotation process, generating local negative pressure, accelerating the rapid separation of rock cuttings from the bottom of the well, avoiding the drill bit from repeatedly cutting the drill cuttings at the bottom of the well, and improving the mechanical drilling speed and the risk of drill bit mud packing; compared with conventional diameter protection, the long spiral diameter protection is appropriately extended to make the well wall smoother; in the design of the long spiral diameter protection, the diameter protection of three auxiliary blades is cancelled, the space of the chip removal groove is increased, and it is conducive to the rapid return of the cuttings; at the same time, the design of the outer diameter of the bottom of the diameter protection chip removal groove being the same as the outer diameter of the drill bit shank is adopted to increase the depth of the chip removal groove, further improve the negative pressure lifting capacity of the long spiral diameter protection, and improve the wellbore cleaning effect. In the tooth design of PDC cutters, forward-inclined cutters or a mixed tooth design of forward-inclined cutters and conventional backward-inclined cutters are adopted to plow the bottom of the well. The form of rock destruction is changed from the shear destruction of conventional PDC cutters to comprehensive destruction by "shoveling", which reduces the mechanical energy consumption of rock breaking and improves rock breaking efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram showing a front view of a long spiral gauge-protected negative pressure forward-inclined tooth PDC drill bit according to an embodiment of the utility model;

[0028] Figure 2 A schematic top view of a long spiral gauge-protected negative pressure forward-inclined tooth PDC drill bit according to an embodiment of the utility model is shown;

[0029] Figure 3 The figure schematically shows the usage state of the forward-inclined PDC cutting tooth according to one embodiment of the utility model. DETAILED DESCRIPTION

[0030] The present invention will now be discussed with reference to exemplary embodiments. It should be understood that the embodiments discussed are only intended to enable those skilled in the art to better understand and implement the present invention, rather than to imply any limitation on the scope of the present invention.

[0031] As used herein, the term “including” and variations thereof are to be interpreted as open-ended terms meaning “including, but not limited to.” The term “based on” is to be interpreted as “based, at least in part, on.” The terms “one embodiment” and “an embodiment” are to be interpreted as “at least one embodiment.”

[0032] Figure 1 A schematic diagram showing a front view of a long spiral gauge-protected negative pressure forward-inclined tooth PDC drill bit according to an embodiment of the utility model; Figure 2 The top view of a long spiral gauge-protected negative pressure forward-inclined tooth PDC drill bit according to one embodiment of the utility model is schematically shown. Figure 1 and Figure 2 As shown, in this embodiment, the long spiral gauge-maintaining negative pressure forward-inclined tooth PDC drill bit comprises:

[0033] Drill bit shank 1;

[0034] A drill head 2, supported on a drill shank 1;

[0035] The drill head 2 comprises: a drill body 3, a plurality of long blade wings 4, a plurality of short blade wings 5, a plurality of nozzles 6 and forward-inclined PDC cutting teeth 7;

[0036] The long blade wings 4 and the short blade wings 5 ​​are arranged on the drill body 3 at intervals along the circumference of the drill body 3;

[0037] One end (upper end in the figure) of each long blade wing 4 is connected to the end (upper end in the figure) of the drill body 3, and each long blade wing 4 is spirally arranged on the outer wall of the drill body 3;

[0038] A blade chip removal groove 8 is provided between the long blade wing 4 and the short blade wing 5;

[0039] There is a diameter-protecting chip removal groove 9 between each long blade wing 4.

[0040] Each nozzle 6 is arranged in the blade chip groove 8 respectively.

[0041] Furthermore, if Figure 1 As shown, in this embodiment, each long blade wing 4 includes: a blade wing 10 and a long spiral diameter protection 11;

[0042] One end (upper end in the figure) of each blade 10 is connected to the end (upper end in the figure) of the drill body 3;

[0043] Each long spiral diameter guard 11 is connected to the other end of each blade 10, and is spirally arranged on the outer wall of the drill body 3, and its other end (the lower end in the figure) extends to the outer wall of the other end (the lower end in the figure) of the drill body 3.

[0044] Furthermore, in this embodiment, the drill head includes three long blade wings 4, and the long spiral diameter protection 11 of each long blade wing 4 is arranged on the outer wall of the drill body around a circumference of 140-180°. In this way, the long spiral diameter protection 11 of the three long blade wings 4 can achieve a circumferential coverage of 420°-540° on the outer wall of the drill body 3.

[0045] Furthermore, if Figure 1 As shown, in this embodiment, the outer diameter of the drill body 3 on the side of the gauge-maintaining chip removal groove 9 away from the blade is the same as the outer diameter of the drill shank 1 .

[0046] Further, Figure 3 The following schematically shows a usage state diagram of a forward-inclined PDC cutting tooth according to an embodiment of the present utility model. In this embodiment, the forward-inclined PDC cutting tooth 7 is a scraping PDC cutting tooth.

[0047] According to the above scheme of the utility model, the utility model provides a long spiral gauge protection negative pressure forward-inclined tooth six-blade PDC drill bit, which achieves 420°-540° circumferential coverage through the long spiral gauge protection with three main blades. When the drill bit is working, it rotates clockwise, and the long spiral gauge protection lifts the mixture of drill cuttings and drilling fluid upward during the clockwise rotation process, generating local negative pressure, accelerating the rapid separation of rock cuttings from the bottom of the well, avoiding the drill bit from repeatedly cutting drill cuttings at the bottom of the well, and improving the mechanical drilling speed and the risk of drill bit mud packing; compared with conventional gauge protection, the long spiral gauge protection is appropriately extended to make the well wall smoother; in the design of long spiral gauge protection, the three auxiliary blades are cancelled to increase the space of the chip removal groove, which is conducive to the rapid return of drill cuttings; at the same time, the design of the outer diameter of the bottom of the gauge protection chip removal groove being the same as the outer diameter of the drill bit shank is adopted to increase the depth of the chip removal groove, further improve the negative pressure lifting capacity of the long spiral gauge protection, and improve the wellbore cleaning effect. In the tooth design of PDC cutters, forward-inclined cutters or a mixed tooth design of forward-inclined cutters and conventional backward-inclined cutters are adopted to plow the bottom of the well. The form of rock destruction is changed from the shear destruction of conventional PDC cutters to comprehensive destruction by "shoveling", which reduces the mechanical energy consumption of rock breaking and improves rock breaking efficiency.

[0048] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A long spiral gauge-protected negative pressure forward-inclined tooth PDC drill bit, characterized in that: include: Drill bit shank; A drill head supported on the drill shank; The drill head comprises: a drill body, a plurality of long blades, a plurality of short blades, a plurality of nozzles and forward-inclined PDC cutting teeth; The long blade wings and the short blade wings are arranged on the drill body at intervals along the circumference of the drill body; One end of each of the long blade wings is connected to the end of the drill body, and each of the long blade wings is spirally arranged on the outer wall of the drill body; A blade chip removal groove is provided between the long blade and the short blade; There is a diameter-protecting chip removal groove between each of the long blade wings; Each of the nozzles is respectively arranged in the blade chip removal groove.

2. The long spiral gauge-maintaining negative pressure forward-inclined tooth PDC drill bit according to claim 1 is characterized in that: Each of the long blade wings comprises: a blade wing and a long spiral gage guard; One end of each blade is connected to the end of the drill body; Each of the long spiral gauge guards is respectively connected to the other end of each of the blade wings, and is spirally arranged on the outer wall of the drill body, and the other end thereof extends to the outer wall of the other end of the drill body.

3. The long spiral gauge-maintaining negative pressure forward-inclined tooth PDC drill bit according to claim 2 is characterized in that: The drill head comprises three long blade wings, and the long spiral diameter protection of each long blade wing is arranged on the outer wall of the drill body around a circumference of 140-180 degrees.

4. The long spiral gauge-maintaining negative pressure forward-inclined tooth PDC drill bit according to claim 2, characterized in that: The outer diameter of the drill body at the side of the gauge-maintaining chip removal groove away from the blade wing is the same as the outer diameter of the drill shank.

5. The long spiral gauge-maintaining negative pressure forward-inclined tooth PDC drill bit according to any one of claims 1 to 4, characterized in that: The forward-inclined PDC cutting teeth are skiving PDC cutting teeth.

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