Anti-bouncing-sticking high-stability drill bit for drilling

Abstract

An anti-bouncing-sticking high-stability drill bit for drilling. The drill bit comprises: a drill bit body (1), cutting teeth (3), gauge teeth (4) and a plurality of blades (20), wherein the blades (20) are arranged on the drill bit body (1); each of the blades (20) has a main cutting portion and a gauge portion distributed in a direction from the center of the drill bit to the outside; the cutting teeth (3) are mounted on the main cutting portions; and the gauge teeth (4) are mounted on the gauge portions. The plurality of blades (20) comprise at least two helical blades (2); and in the helical blades (2), a helix angle β is formed between a line connecting a gauge point (51) of the main cutting portion to a gauge end point (61) of the gauge portion and a plane perpendicular to the axis of the drill bit, and satisfies 15°≤β≤60°. The technical problems of poor borehole trajectory quality and difficulty in ensuring wellbore wall quality which are caused by poor stability of the drill bit during the drilling process of the drill bit are solved.

Description

Anti-sticking and strong stabilizing drilling bit

[0001] Related Applications

[0002] The present application claims priority to Chinese Patent Application No. 202410725455.3, filed on June 5, 2024, and incorporates by reference the disclosure of the aforementioned patent application as part of the present application. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of drilling tools for oil and gas, geothermal, and geophysical exploration, and more particularly to an anti-sticking and strong stabilizing drilling bit. BACKGROUND

[0004] The performance of a drill bit is directly related to the efficiency, quality, cost, and even safety of drilling. Although small in size, the drill bit is an important tool for increasing drilling speed and reducing costs. PDC (Polycrystalline Diamond Compact) drill bits are one of the most commonly used rock-breaking tools in current oil and gas drilling engineering. PDC drill bits play an important role in increasing drilling speed and reducing drilling costs, and have gradually replaced roller bits to become the main rock-breaking tool. Nearly 90% of drilling footage is completed by PDC drill bits, and PDC drill bits have dominated oil and gas drilling.

[0005] The present PDC drill bit is designed with straight blade wings or small inclination structures. The straight blade wings extend axially from the main cutting structure to the gauge structure, and the small inclination blade wings have a small angle of inclination from the main cutting structure to the gauge structure along the axial direction of the drill bit.

[0006] The present drill bit has straight blade wings, large circumferential space between the blade wings, and many gaps in the circumferential gauge region, resulting in poor circumferential gauge continuity. This brings the following disadvantages: (1) The present drill bit has poor stability during drilling, especially when drilling in large-size well sections or in heterogeneous formations. The drill bit is prone to sticking, impact, and stick-slip vibration, increasing the risk of bit tooth collapse and impact damage, and causing safety problems such as drill string damage and rupture. (2) The drill bit has poor steering performance. In directional drilling engineering, due to the large gap between the blade wings and the poor circumferential gauge continuity, the drill bit has obvious impact when cutting the bottom and the wall during the transition from one blade wing to another for rock breaking. The drill bit has large torsional vibration and torque fluctuation, poor tool face stability, and poor directional performance. (3) The drill bit has poor circumferential continuity, which leads to poor well trajectory quality and difficulty in ensuring the quality of the well wall. SUMMARY

[0007] The purpose of the present disclosure is to provide an anti-sticking and strong stabilizing drilling bit to solve the technical problem of poor drill bit stability during drilling, which leads to poor well trajectory quality and difficulty in ensuring the quality of the well wall.

[0008] The above object of the present disclosure can be achieved by the following technical solutions.

[0009] The present disclosure provides a strong-stability anti-sticking drilling bit, comprising a bit body, cutting teeth, gauge teeth, and a plurality of blades, the blades are arranged on the bit body, the blades have a main cutting part and a gauge part distributed in a direction from the center of the bit body to the outside, the cutting teeth are arranged on the main cutting part, and the gauge teeth are arranged on the gauge part; the plurality of blades comprise at least two rotary blades, and in the rotary blades, a line connecting a gauge point of the main cutting part to a gauge end point of the gauge part and a plane perpendicular to the axis of the bit body have a rotary angle β, and satisfy 15°≤β≤60°.

[0010] In a preferred embodiment, the gauge part of at least one of the rotary blades is circumferentially connected to or partially overlaps with the gauge part of an adjacent blade.

[0011] In a preferred embodiment, 15°≤β<30°, and the gauge part of the rotary blade partially overlaps with the gauge part of an adjacent blade.

[0012] In a preferred embodiment, 30°≤β<60°, and the gauge part of the rotary blade is circumferentially connected to the gauge part of an adjacent blade.

[0013] In a preferred embodiment, the gauge teeth on the gauge part of at least one of the rotary blades are circumferentially connected to or partially overlap with the gauge teeth on the gauge part of an adjacent blade.

[0014] In a preferred embodiment, the axial height h1 of the gauge part of the rotary blade and the axial height h of the main cutting part of the rotary blade satisfy h≤h1≤3h.

[0015] In a preferred embodiment, the sum of the lengths of the blank areas between the blades in the circumferential direction is less than 20% of the outer circumference of the bit.

[0016] In a preferred embodiment, the plurality of blades comprise non-rotary blades.

[0017] In a preferred embodiment, the cutting teeth on the rotary blades are arranged at intervals along a curve on the front cutting surface of the cutting part, and the gauge teeth on the rotary blades are arranged at intervals along a curve on the front cutting surface of the gauge part.

[0018] In a preferred embodiment, the gauge part of the rotary blade has a spiral line shape.

[0019] The features and advantages of the present disclosure are as follows:

[0020] The drill bit, the gauge portion of the rotary blade is in an extending inclined shape in the circumferential direction, therefore, the space between the rotary blade and the adjacent blade is in an extending inclined shape in the circumferential direction, so that at the same circumferential position, some positions have the space and some positions do not have the space from different positions outward from the center of the drill bit, thereby reducing the space at the same circumferential position of the drill bit, making the process of the drill bit from one blade to another blade cutting and breaking the rock stable and continuous, improving the continuity of the circumferential gauge of the drill bit and the stability of the drilling.

[0021] Moreover, the space between the blades forms a liquid flow channel groove, the space between the blades is the area where the drilling fluid flows and the cuttings are discharged, the space between the rotary blade and the adjacent blade can form a longer liquid flow channel, which is beneficial to the contact between the drilling fluid and the blades, the cutting teeth and the gauge teeth, and improves the cooling effect of the drilling fluid.

[0022] By arranging the rotary blade, the drill bit reduces the kick phenomenon when cutting the bottom and the wall of the well, reduces the torsional vibration and torque fluctuation of the drill bit, improves the stability of the tool face and the directional performance, and is beneficial to ensuring the quality of the well trajectory and the well wall. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] FIG. 1 is a structural schematic view of an embodiment of the strong-stable drilling drill bit provided by the present disclosure;

[0025] FIG. 2 is a view of the strong-stable drilling drill bit shown in FIG. 1 along the axis of the drill bit;

[0026] FIG. 3 is a structural front view of the rotary blade of the strong-stable drilling drill bit shown in FIG. 1;

[0027] FIG. 4 is a schematic view of the axial height of the gauge portion and the main cutting portion of the rotary blade of the strong-stable drilling drill bit shown in FIG. 1;

[0028] FIG. 5 is a schematic view of the rotation angle of the rotary blade of the strong-stable drilling drill bit shown in FIG. 1;

[0029] FIG. 6 is a schematic view of the structure in which the gauge portion of the rotary blade of the strong-stable drilling drill bit provided by the present disclosure is circumferentially connected to the gauge portion of the adjacent blade;

[0030] Fig. 7 is a structural schematic diagram of the partially overlapping structure in the circumferential direction between the gauge portion of the rotary blade of the anti-sticking and strong-stabilizing drilling bit and the gauge portion of its adjacent blade provided by the present disclosure;

[0031] Fig. 8 is a structural schematic diagram of the sum of the circumferential length of the blank area of the bit body of the anti-sticking and strong-stabilizing drilling bit provided by the present disclosure;

[0032] Fig. 9 is a structural schematic diagram of the anti-sticking and strong-stabilizing drilling bit with non-rotary blades provided by the present disclosure;

[0033] Fig. 10 is a schematic diagram of the circumferentially abutting or partially overlapping structure between the gauge teeth on the gauge portion of the rotary blade and the gauge teeth on the gauge portion of its adjacent blade of the anti-sticking and strong-stabilizing drilling bit provided by the present disclosure.

[0034] Brief Description of the Drawings: 1, bit body; 20, blade; 2, rotary blade; 21, non-rotary blade; 3, cutting tooth; 4, gauge tooth; 5, bit gauge; 51, gauge point; 6, gauge line; 61, gauge end point; 7, liquid flow channel groove. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present disclosure.

[0036] The embodiments of the present disclosure provide an anti-sticking and strong-stabilizing drilling bit, as shown in Figs. 1-10, which comprises a bit body 1, cutting teeth 3, gauge teeth 4 and a plurality of blades 20. The blades 20 are arranged on the bit body 1, and the blades 20 have a main cutting portion and a gauge portion distributed in the direction from the center of the bit body to the outside. The cutting teeth 3 are installed on the main cutting portion, and the gauge teeth 4 are installed on the gauge portion. The plurality of blades 20 includes at least two rotary blades 2, and in the rotary blades 2, the line connecting the gauge end point 61 of the gauge portion to the gauge point 51 of the main cutting portion has a rotary angle β with the plane perpendicular to the axis of the bit, and satisfies 15°≤β≤60°.

[0037] The space between the blades 20 in the conventional drill bit is shaped to extend outwardly from the center of the drill bit without extending in the circumferential direction, i.e., for the region of the space, the space extends from the center of the drill bit to the edge of the drill bit at the same position in the circumferential direction. In this drill bit, the gauge portion of the rotary blade 2 is shaped to extend obliquely in the circumferential direction, and therefore, the space between the rotary blade 2 and the adjacent blade 20 is also shaped to extend obliquely in the circumferential direction, so that at the same position in the circumferential direction, some positions have the space and some positions do not have the space, extending outwardly from the center of the drill bit at different positions. Thus, the space at the same position in the circumferential direction of the drill bit is reduced, and the process of the drill bit transitioning from one blade 20 to another blade 20 to break rock is smooth and continuous, and the continuity of the gauge in the circumferential direction of the drill bit and the stability of drilling are improved.

[0038] Furthermore, the space between the blades 20 forms the liquid flow channel 7, and the space between the blades 20 is the region where the drilling fluid flows and the cuttings are discharged. The rotary blade 2 and the adjacent blade 20 can form a longer liquid flow channel 7, which is beneficial to the contact of the drilling fluid with the blades 20, the cutting teeth 3 and the gauge teeth 4, and improves the cooling effect of the drilling fluid.

[0039] By providing the rotary blade 2, the drill bit reduces the bumping phenomenon when cutting the bottom and the wall of the well, reduces the torsional vibration and torque fluctuation of the drill bit, improves the stability of the tool face and the directional performance, and is beneficial to ensuring the quality of the well trajectory and the well wall.

[0040] The gauge region refers to a region with the same diameter as the outer diameter of the drill bit, and the gauge teeth 4 are located in the gauge region. The main cutting structure of the drill bit refers to the cutting structure from the center of the drill bit to the gauge. As shown in FIGS. 3-6, the gauge end point 61 refers to the point at which the gauge region of the blade 20 ends on the front cutting surface, and the connecting line circle formed by connecting all the gauge points of the blades 20 is the gauge line 6. The part of the blade 20 located in the gauge region is the gauge portion, and the part of the blade 20 located in the main cutting structure of the drill bit is the main cutting portion. The gauge point 51 is the point in the cutting structure of the drill bit from the center of the drill bit outwardly to the outer diameter of the drill bit, and the circle formed by connecting all the gauge points 51 of the blades 20 is the gauge 5 of the drill bit. The rotation angle β is the included angle between the connecting line between the gauge point 51 and the gauge end point 61 on the front cutting surface of the same rotary blade 2 and the plane perpendicular to the axis of the drill bit. The plane perpendicular to the axis of the drill bit is the cross section of the drill bit.

[0041] Further, the gauge portion of at least one rotary blade 2 and the gauge portion of the adjacent blade 20 thereof are connected or partially overlapped in the circumferential direction to form a circumferentially continuous gauge between the blades 20 and the blades 20, which is beneficial to improving the stability of the drill bit during drilling.

[0042] In one embodiment, as shown in FIGS. 5 and 7, 15°≤β<30°, and the gage portion of the rotary blade 2 partially overlaps the gage portion of the adjacent blade 20 in the circumferential direction, which reduces the space in the same circumferential position of the drill bit, improves the continuity of the circumferential gage of the drill bit, the stability of drilling, and guarantees the effect of chip removal and the cooling effect of the drilling fluid on the cutting teeth 3.

[0043] In another embodiment, as shown in FIG. 6, 30°≤β<60°, and the gage portion of the rotary blade 2 is connected to the gage portion of the adjacent blade 20 in the circumferential direction, forming the circumferential continuous gage between the blades 20, which improves the continuity of the circumferential gage of the drill bit, the stability of drilling, and is conducive to the cooling of the drilling fluid on the cutting teeth 3, the improvement of the rock breaking efficiency of the drill bit, and the prolongation of the service life of the drill bit.

[0044] Further, the gage teeth 4 on the gage portion of at least one rotary blade 2 are connected to or partially overlap the gage teeth 4 on the gage portion of the adjacent blade 20 in the circumferential direction, the gage teeth 4 cut as the drill bit rotates, thereby forming the circumferential continuous gage, and improving the circumferential gage capacity of the drill bit.

[0045] In one embodiment, as shown in FIG. 4, the axial height h1 of the gage portion of the rotary blade 2 and the axial height h of the main cutting portion of the rotary blade 2 satisfy: h≤h1≤3h, i.e., the axial height h1 of the gage portion of the rotary blade 2 is greater than or equal to the axial height h of the main cutting portion of the drill bit, and less than or equal to three times h, which is conducive to ensuring that the drill bit has sufficient gage area, reducing the occurrence of jamming and stick-slip vibration of the drill bit when drilling large-size well sections or in inhomogeneous formations, and reducing safety problems such as tooth collapse and impact damage of the drill bit, drill string damage and fracture.

[0046] In one embodiment, the sum of the lengths of the blank areas between the blades 20 in the circumferential direction is less than 20% of the outer circumference of the drill bit, which makes the process of the drill bit transitioning from one blade 20 to another blade 20 smooth and continuous, improves the continuity of the circumferential gage of the drill bit, and the stability of drilling. In the projection along the axial direction of the drill bit, the area between the adjacent blades 20 forms a region without blades 20, which is the blank area between the blades 20 without gage, as shown in FIG. 8, the lengths of the respective blank areas in the circumferential direction are α1, α2, α3, …, and the sum of the lengths of the blank areas between the blades 20 in the circumferential direction is α=α1+α2+α3+…. This embodiment satisfies: α<πD / 5, D being the outer diameter of the drill bit.

[0047] The blades 20 in the drill bit can all be rotary blades 2, or some can be rotary blades 2 and some can be non-rotary blades 21.

[0048] In an embodiment, the plurality of blades 20 in the drill bit include non- spiral blades 21. The non-spiral blades 21 are other cutting structure blades, and such blades 20 can be straight blades, inclined blades, tapered blades, or other cutting structure blades with more complex structures.

[0049] Preferably, the blades 20 in the drill bit include spiral blades 2 and non- spiral blades 21, and the sum of the lengths of the non-gauge clearance areas between the blades 20 in the circumferential direction is less than 20% of the outer circumferential length of the drill bit, so that the drill bit smoothly and continuously transitions from one blade 20 to another blade 20 during rock breaking, improving the stability of drilling.

[0050] In an embodiment, the plurality of cutting teeth 3 on the spiral blade 2 are arranged at intervals along the curve on the front cutting surface of the cutting portion, and the gauge teeth 4 on the spiral blade 2 are arranged at intervals along the curve on the front cutting surface of the gauge portion. Unlike the consistent orientation of each cutting tooth 3 on the straight blade 20, the cutting surfaces of each cutting tooth 3 and gauge tooth 4 on the spiral blade 2 are oriented differently, and are subjected to different directions of back cutting forces during cutting, which is conducive to generating smaller torque, so that the drill bit can drill into formations that require large torque, such as difficult-to-drill formations and formations containing gravel.

[0051] The gauge portion of the spiral blade 2 in the drill bit extends in an inclined manner in the circumferential direction, and the overall trend is to spiral around the bit body 1. Further, the trend of the gauge portion of the spiral blade 2 is in the form of a spiral line, which is conducive to a more stable and continuous process of cutting and breaking rocks, improving the stability of drilling. Moreover, compared with the straight blades or other cutting structure blades of conventional PDC drill bits, the spiral blade 2 has a longer outer curve on the front cutting surface, and the main cutting area of the blade 20 can be arranged with more cutting teeth 3, thereby improving the rock breaking efficiency of the drill bit, enhancing the directional capability and working stability of the drill bit, and thus improving the drilling efficiency and prolonging the service life of the drill bit.

[0052] In conventional drill bits, if the circumferential width of the blade 20 is increased, the space for the flow of drilling fluid will be reduced, the cooling effect of the drilling fluid on the cutting teeth 3 and the chip removal effect of the drill bit will be reduced, the rock breaking efficiency of the drill bit will be affected, and the service life of the drill bit will be reduced. In the drill bit of the present disclosure, the space between the spiral blade 2 and the adjacent blade 20 extends in an inclined manner in the circumferential direction, which ensures the circumferential continuity of the gauge between the blades 20 while ensuring the cooling effect of the drilling fluid on the cutting teeth 3 and the rock breaking efficiency of the drill bit.

[0053] In an embodiment of the present disclosure, the crown material of the cutting teeth 3 and the gauge teeth 4 is polycrystalline diamond composite material, the crown is polycrystalline diamond, polycrystalline diamond compact, or thermally stable polycrystalline diamond, or the crown contains polycrystalline diamond, polycrystalline diamond compact, or thermally stable polycrystalline diamond.

[0054] In order to make the structural features of the drill bit provided by the present disclosure more clear, specific embodiments are provided below for illustration.

[0055] Embodiment one:

[0056] As shown in FIG. 1, FIG. 2, FIG. 3, FIG. 4, and FIG. 5, the strong-stable anti-sticking drilling bit comprises a bit body 1, cutting teeth 3, gauge teeth 4, and a plurality of blades 20, and at least two spiral blades 2 are arranged on the bit body 1. A liquid flow channel 7 is formed between adjacent spiral blades 2, and the flow area of the liquid flow channel 7 gradually increases in the direction from the center of the bit to the outside. The axial height h1 of the gauge portion of the spiral blade 2 and the axial height h of the main cutting portion satisfy h≤h1≤3h. The spiral angle β of the spiral blade 2 ranges from 15° to 60°. The gauge portion of at least one spiral blade 2 is circumferentially connected to or partially overlaps with the gauge portion of the adjacent blade 20. The sum of the circumferential lengths of the blank areas of the bit body 1 is less than 20% of the outer circumference of the bit.

[0057] As shown in FIG. 10, in this embodiment, the cutting teeth 3 are arranged at intervals along the curve on the front cutting surface of the cutting portion of the spiral blade 2. The cutting surfaces of each tooth of the spiral blade 2 are different in direction, and bear different directions of back cutting force during cutting, which is beneficial to generate smaller torque. The gauge teeth 4 are arranged at intervals along the curve on the front cutting surface of the gauge portion of the spiral blade 2. At least one gauge tooth 4 on the gauge portion of the spiral blade 2 circumferentially connects to or partially overlaps with the gauge tooth 4 on the gauge portion of the adjacent blade 20, thereby improving the circumferential gauge ability of the bit.

[0058] Embodiment two:

[0059] As shown in FIG. 5, FIG. 6, and FIG. 7, this embodiment is basically the same as “Embodiment one”, and the difference lies in that the spiral angle β of the spiral blade 2 ranges from 15° to 30°, and the gauge portion of the spiral blade 2 circumferentially partially overlaps with the gauge portion of the adjacent blade 20; or the spiral angle β of the spiral blade 2 ranges from 30° to 60°, and the gauge portion of the spiral blade 2 circumferentially connects to the gauge portion of the adjacent blade 20. In this embodiment, the gauge portion of the spiral blade 2 circumferentially connects to or partially overlaps with the gauge portion of the adjacent blade 20, thereby reducing the empty space of the blade 20 at the same circumferential position of the bit, forming circumferential continuous gauge between the blade 20 and the blade 20, and improving the continuity of the circumferential gauge of the bit.

[0060] Embodiment three:

[0061] As shown in FIG. 8 and FIG. 9, the embodiment is basically the same as "Embodiment One", and the difference is that the drill bit body 1 is provided with non-rotary blades 21, and the sum of the circumferential lengths of the non-rotary blades 21 and the non-gauge blank area formed by the rotary blades 2 on the drill bit body 1 is less than 20% of the outer circumference length of the drill bit, so that the process of the drill bit from one blade 20 to another blade 20 cutting and breaking rock becomes smooth and continuous, and the continuity of the circumferential gauge of the drill bit and the stability of the drilling are improved.

[0062] The above only describes several embodiments of the present disclosure, and those skilled in the art can make various modifications or changes to the embodiments of the present disclosure according to the content disclosed in the application file without departing from the spirit and scope of the present disclosure.

Claims

1. A kick-over resistant, strong stabilizer drilling bit, characterized by, The drill bit comprises a bit body, cutting teeth, gauge teeth, and a plurality of blades, the blades are arranged on the bit body, the blades have a main cutting part and a gauge part distributed in a direction from the center of the bit body to the outside, the cutting teeth are mounted on the main cutting part, and the gauge teeth are mounted on the gauge part; the plurality of blades comprises at least two rotary blades, and in the rotary blades, the line between the gauge point of the main cutting part and the gauge end point of the gauge part has a rotary angle β with the plane perpendicular to the axis of the bit, and satisfies 15°≤β≤60°.

2. The strong-stabilized anti-sticking drilling bit according to claim 1, wherein the gauge part of at least one of the rotary blades is circumferentially connected to or partially overlapped with the gauge part of the adjacent blade.

3. The strong-stabilized anti-sticking drilling bit according to claim 2, wherein 15°≤β<30°, and the gauge part of the rotary blade is partially overlapped with the gauge part of the adjacent blade.

4. The strong-stabilized anti-sticking drilling bit according to claim 2, wherein 30°≤β<60°, and the gauge part of the rotary blade is circumferentially connected to the gauge part of the adjacent blade.

5. The strong-stabilized anti-sticking drilling bit according to any one of claims 2-4, wherein the gauge teeth on the gauge part of at least one of the rotary blades are circumferentially connected to or partially overlapped with the gauge teeth on the gauge part of the adjacent blade.

6. The strong-stabilized anti-sticking drilling bit according to claim 1, wherein the axial height h1 of the gauge part of the rotary blade satisfies h≤h1≤3h.

7. The strong-stabilized anti-sticking drilling bit according to claim 1, wherein the sum of the circumferential length of the blank area without gauge between the blades is less than 20% of the outer circumference of the bit.

8. The strong-stabilized anti-sticking drilling bit according to claim 7, wherein the plurality of blades comprises non-rotary blades.

9. The strong-stabilized anti-sticking drilling bit according to claim 1, wherein the plurality of cutting teeth on the rotary blade are arranged along a curve on the front cutting surface of the cutting part, and the gauge teeth on the rotary blade are arranged along a curve on the front cutting surface of the gauge part.

10. The strong-stabilized anti-sticking drilling bit according to claim 1, wherein the gauge part of the rotary blade presents a helix shape. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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