Offshore jet drilling operation drill bit capable of preventing inclination and vibration

Abstract

The utility model relates to the technical field of drilling, in particular to an anti-inclination vibration offshore jet drilling operation drill bit which comprises a connector, a connecting block arranged on the connector and a plurality of blades arranged on the connecting block, the blades are evenly distributed in the circumferential direction, and each blade comprises a cutting portion and a gauge protection portion. The radial size of the gauge protection part is larger than the maximum radial size of the cutting part, and the end, close to the rotating axis, of the cutting part is bent in the direction of the connector and defines a concave part. The radial size of the gauge protection part is larger than the maximum radial size of the cutting part, so that the outer wall of the gauge protection part can firstly make contact with the inner wall of the supporting guide pipe, compared with cutting teeth, the contact area of the gauge protection part and the inner wall of the pipe is larger, impact is small during touch, and inclination and vibration are small; in addition, damage to the cutting pipe wall and the cutting teeth caused by collision between the cutting teeth and the inner wall of the pipe can be avoided, material loss is reduced, stratum protrusions are formed on the underground layer when the drill bit drills through the concave parts, the centering effect on the drill bit is achieved, and inclination and radial vibration of the drill bit are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the drilling technology field more particularly, relate to a kind of offshore jet drilling operation drill bit of anti-inclination vibration. BACKGROUND

[0002] Deepwater oil and gas increasingly become the hot spot of marine oil exploration and development, but deepwater drilling operation faces many problems and challenges. The marine shallow water area usually uses the way of piling or drilling to operate after entering and cementing. In deep water area, due to the problems of unstable seabed, low fracture pressure, gas hydrate blockage, shallow water flow hazard, and low temperature change of seabed, the conventional piling, drilling, and cementing of water conductor are often difficult, with high operation risk, which is not suitable for deepwater drilling with high daily expenses.

[0003] Deepwater surface jet drilling technology is one of the key technologies to solve the problem of deepwater shallow drilling. The technology uses the way of entering power drill and drill bit in the jet pipe column at the same time, uses the hydraulic jet of drill bit and the gravity of pipe string drilled below the mud line to drill, uses the adhesion and friction of stratum to stabilize the water conductor after jet drilling, completes the installation of water conductor, and then the drill bit, power drill pipe column and water conductor are separated to freely drop drilling to continue drilling in the next well section. The PDC drill bit used in conventional drilling mode is prone to tilt and vibration in deepwater surface jet drilling, and the main reasons are as follows: 1. The cutting teeth of conventional PDC drill bit are prone to collide with the wall of water conductor during drilling, which causes the drill bit to tilt and vibrate under the impact of pipe wall, with poor stability; 2. The drill bit lacks centering during drilling, which causes the drill bit to vibrate horizontally. The tilt and vibration of drill bit will reduce the drilling efficiency and cause the drilling direction to deviate, which greatly affects the operation. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the problems of tilt and vibration of PDC drill bit cutting teeth in the prior art, and provides a kind of offshore jet drilling operation drill bit of anti-inclination vibration, which reduces the tilt and vibration of drill bit and improves stability.

[0005] To solve the above technical problems, the utility model adopts the technical scheme of:

[0006] The application provides an offshore jet drilling bit capable of preventing inclination and vibration, which comprises a joint, a connecting block arranged on the joint and a plurality of blades arranged on the connecting block.

[0007] The joint is used for connecting an output shaft of a driving device, the driving device drives the bit to rotate, the cutting part is provided with cutting teeth, the cutting teeth are rotated at high speed to realize cutting, and the drilling effect is achieved.

[0008] Further, the angle between the end of the cutting part close to the rotation axis and the rotation axis is 60-80 degrees.

[0009] Further, the radial dimension of the gage part is 0.5-2mm larger than the maximum radial dimension of the cutting part.

[0010] Further, the outer surface of the constant path portion is an arc surface. The outer surface of the constant path portion is an arc surface, which has a larger contact area with the inner wall of the pipe and better anti-inclination effect.

[0011] Further, the cutting teeth are uniformly arranged at the top end of the cutting portion, and each cutting portion is provided with a plurality of rows of cutting teeth. The cutting area and the quality of the cutting surface are ensured.

[0012] Further, the connecting block forms a chip removal groove between the adjacent two blade wings, and a plurality of nozzles are arranged in the chip removal groove. When the drill bit drills, the cuttings can be discharged through the chip removal groove, so that the accumulation of the cuttings does not hinder the drilling of the drill bit. The water flow sprayed by the nozzles can also clean the blade wings, reduce the accumulation of the cuttings on the blade wings, avoid the accumulation of the cuttings from hindering the drilling of the drill bit, and the water flow can also cool and lubricate the cutting teeth to reduce thermal wear.

[0013] Further, the axes of the nozzles of any two chip removal grooves are staggered, and the included angle between the axis of the nozzle and the rotation axis increases as the distance between the nozzle and the rotation axis increases. The positions and angles of the nozzles between the blade wings are different, so that the jet flow forms a balanced coverage at the bottom of the well, and the flushing and cooling effects are better.

[0014] Further, the included angle between the axis of the nozzle and the rotation axis is 10°-85°, and the angle difference between the maximum included angle and the minimum included angle between the axis of the nozzle and the rotation axis is 30°-75°. The appropriate jet range can improve the coverage area of the water flow as much as possible while ensuring the jet speed of the water flow.

[0015] Further, the water outlet of the nozzle is in an elliptical shape. The elliptical water outlet makes the jet flow from the nozzle have a larger coverage area and better flushing and cooling effect.

[0016] Further, the cutting teeth are polycrystalline diamond compacts. The polycrystalline diamond compacts have high hardness and wear resistance, and thus have good cutting characteristics.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. Because the radial dimension of the retaining section is larger than the maximum radial dimension of the cutting section, the outer wall of the retaining section can contact the inner wall of the supporting conduit. Compared with the direct contact between the cutting teeth and the inner wall of the water-proof conduit, the contact area between the retaining section and the inner wall of the pipe is larger, and the impact generated when they touch is smaller. Therefore, the tilting and vibration generated are also smaller, and the stability of the drill bit is better. It can also avoid damage to the pipe wall and cutting teeth caused by the collision between the cutting teeth and the inner wall of the pipe, reducing material consumption. The setting of the recessed part can form a significant stratum protrusion in the ground layer when the drill bit is cutting and drilling. This protrusion will have a centering effect on the drill bit when drilling, making the drill bit less likely to tilt, reducing the radial vibration of the drill bit, and improving stability.

[0019] 2. The chip removal groove is designed so that rock cuttings can be discharged through the chip removal groove when the drill bit is drilling, thus avoiding the accumulation of rock cuttings that would hinder the drilling of the drill bit;

[0020] 3. Nozzle settings: The water jet from the nozzle can also clean the cutter blades, reducing the accumulation of rock cuttings on the blades and preventing the rock cuttings from hindering the drill bit's progress. The water jet can also cool and lubricate the cutting teeth, reducing thermal wear.

[0021] 4. The nozzle positions and spray angles between each blade are different, so that the jet flow forms a uniform coverage at the bottom of the well, resulting in better flushing and cooling effects. Attached Figure Description

[0022] Figure 1 A schematic diagram of the structure of a marine jet drilling bit designed to prevent tilting and vibration.

[0023] Figure 2 A top view of a marine jet drilling bit designed to prevent tilting and vibration.

[0024] Figure 3 A half-sectional view of a drill bit for offshore jet drilling operations designed to prevent tilting and vibration, when the drill bit is inside a riser.

[0025] Figure 4 for Figure 3 A magnified view of a portion of position A;

[0026] Figure 5 A half-sectional view of a marine jet drilling bit designed to prevent tilting and vibration during cutting and drilling.

[0027] Figure 6 The diagram shows a half-section view of each chip removal groove and a schematic diagram of the axis position of each nozzle.

[0028] In the attached diagram: 100, connecting block; 200, connector; 300, blade wing; 310, cutting part; 311, cutting tooth; 312, recessed part; 320, diameter protection part; 400, chip removal groove; 500, nozzle; 600, water-proof conduit; 700, formation protrusion. Detailed Implementation

[0029] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0030] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0031] Example 1

[0032] A type of drill bit for offshore jet drilling operations that is resistant to tilting and vibration, such as Figures 1-4 As shown, the device includes a connector 200, a connecting block 100 disposed on the connector 200, and five blades 300 disposed on the connecting block 100. The five blades 300 are evenly arranged circumferentially along the axis of rotation. Each blade 300 includes a cutting portion 310 with cutting teeth 311 on its surface and a diameter-protecting portion 320 connected to the cutting portion 310. The diameter-protecting portion 320 is located on the side of the connecting block 100, and the cutting portion 310 is located on the side of the connecting block 100 and extends radially to the end face of the connecting block 100. The cutting teeth 311 are evenly arranged at the top of the cutting portion 310, and each cutting portion 310 is provided with one row of cutting teeth 311. In addition, there can be more rows. The diameter-protecting portion 320 and the cutting portion 310 are transitioned by a chamfer or rounded corner. The cutting teeth 311 are mainly polycrystalline diamond composite sheets. The diameter-keeping portion 320 (PDC), but not limited to PDC, is axially closer to the joint 200 relative to the cutting portion 310. The radial dimension of the diameter-keeping portion 320 is larger than the maximum radial dimension of the cutting portion 310. Figure 4As shown, the size difference d of the two is 1mm, and the outer surface of the gauge section 320 is an arc surface that almost fits the inner wall surface of the riser 600.

[0033] The working principle of the embodiment is as follows:

[0034] The joint 200 is used for connecting the output shaft of the driving device, the driving device drives the drill bit to rotate, the cutting part 310 is provided with cutting teeth 311, the cutting is realized through high-speed rotation of the cutting teeth 311, so that the effect of drilling into the ground is achieved, the cutting teeth 311 are arranged along the radial direction, so that the cutting area of the drill bit is larger, in the drilling process, the riser 600 and the drill bit are lowered synchronously, only part of the drill bit is exposed from the riser 600, and most of the drill bit is located in the riser 600, because the radial dimension of the gauge section 320 is greater than the maximum radial dimension of the cutting part 310, when the rotation axis deviates from the axis of the riser 600, the outer wall of the gauge section 320 can first contact the inner wall of the riser 600, the riser 600 limits excessive inclination of the drill bit, compared with the cutting teeth 311 directly contacting the inner wall of the riser 600, the contact area is larger, the impact generated when touching is smaller, so the inclination and vibration generated are also smaller, and the stability of the drill bit is better, meanwhile, the large radial dimension of the gauge section 320 can avoid damage of the cutting teeth 311 and the cutting pipe wall caused by collision of the cutting teeth 311 and the inner wall of the riser 600, and material loss is reduced.

[0035] Embodiment two

[0036] The second embodiment of the offshore jet drilling operation drill bit for preventing inclination and vibration of the embodiment is similar to that of the first embodiment, and the difference lies in that, as shown in Figure 1 and Figure 5 As shown, the end of the cutting part 310 close to the rotation axis is curved towards the direction of the joint 200 and surrounds a recess 312, as shown in Figure 5 As shown, the included angle θ between the end of the cutting part 310 close to the rotation axis and the rotation axis is 75°.

[0037] The working principle of the embodiment is as follows:

[0038] When the drill bit rotates rapidly, the cutting teeth 311 on each blade 300 form an outer envelope line in the radial plane, the envelope line is called a crown, and the central part of the crown line of the drill bit is concave, which can form a significant ground protrusion 700 on the ground layer when the drill bit cuts and drills, the ground protrusion 700 can center the drill bit when the drill bit drills, so that the drill bit is not easy to incline, the radial vibration of the drill bit is reduced, and the stability is better.

[0039] The remaining working principles of the embodiment are the same as those of the first embodiment.

[0040] Embodiment Three

[0041] This embodiment is a third embodiment of a sea spray drilling bit for preventing tilting and vibration, which is similar to Embodiment One and Embodiment Two, except that, as shown in Figures 1-3 and Figure 6 The connecting block 100 forms a first, a second, a third, a fourth and a fifth chip groove 400 between the adjacent two blades 300, and two nozzles 500 are arranged in the second, the third and the fifth chip groove 400, and three nozzles 500 are arranged in the first and the fourth chip groove 400, as shown in Figure 6 The angles between the axes of the three nozzles 500 in the first chip groove 400 and the rotation axis are 5°, 25° and 50°, respectively, as shown in Figure 6 The angles between the axes of the two nozzles 500 in the second chip groove 400 and the rotation axis are 15° and 45°, respectively, as shown in Figure 6 The angles between the axes of the two nozzles 500 in the third chip groove 400 and the rotation axis are 20° and 40°, respectively, as shown in Figure 6 The angles between the axes of the three nozzles 500 in the fourth chip groove 400 and the rotation axis are 10°, 30° and 55°, respectively, as shown in Figure 6 The angles between the axes of the two nozzles 500 in the fifth chip groove 400 and the rotation axis are 35° and 60°, respectively, as shown in Figure 6 When the central axes of the nozzles 500 rotate to the same radius plane, the axes of the nozzles 500 are staggered, and the angles between the axes of the nozzles 500 and the rotation axis increase with the distance between the nozzles 500 and the rotation axis, and the water outlets of the nozzles 500 are in the shape of an ellipse, in addition to other shapes such as a circle, a rhombus, a strip and the like.

[0042] In addition, the number, the radial position, the circumferential position and the angle with the rotation axis of the nozzles 500 can be changed according to actual needs.

[0043] The working principle of this embodiment is as follows:

[0044] When the drill bit drills, the drill cuttings can be discharged through the discharge groove 400 to avoid the drill cuttings from hindering the drilling of the drill bit, the water jet sprayed by the nozzle 500 can also clean the blades 300 to reduce the accumulation of the drill cuttings on the blades 300 and avoid the drill cuttings from hindering the drilling of the drill bit, the water jet can also cool and lubricate the cutting teeth 311 to reduce thermal wear, the positions and the jet angles of the nozzles 500 between the blades 300 are different, so that the jet flow forms balanced coverage at the bottom of the well, and the flushing and cooling effects are better, and the elliptical water outlet makes the coverage area of the jet flow sprayed from the nozzle 500 larger, so that the flushing and cooling effects are better.

[0045] The remaining working principles of the embodiment are consistent with those of the first embodiment and the second embodiment.

[0046] In the specific contents of the above specific embodiments, each technical feature can be combined arbitrarily without contradiction, and in order to make the description simple, all possible combinations of the above technical features are not described, however, as long as the combination of the technical features does not exist contradiction, it should be considered as the scope of the present application.

[0047] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An anti-tilting and anti-vibration offshore jetting drilling bit, comprising a joint, a connecting block (100) arranged on the joint, and a plurality of blades (300) arranged on the connecting block (100), the blades (300) being uniformly arranged along the circumferential direction of the rotation axis, characterized in that, The blade wing (300) comprises a cutting part (310) provided with cutting teeth (311) on the surface and a gauge part (320) connected with the cutting part (310), the gauge part (320) is located on the side of the connecting block (100), the cutting part (310) is located on the side of the connecting block (100) and extends to the end surface of the connecting block (100) in the radial direction; the gauge part (320) is closer to the joint (200) in the axial direction relative to the cutting part (310), the radial dimension of the gauge part (320) is greater than the maximum radial dimension of the cutting part (310), and the end of the cutting part (310) close to the rotation axis is curved towards the direction of the joint (200) and surrounds a recess (312).

2. A marine jetting drilling bit for use in anti-tilting and anti-vibration drilling operations, according to claim 1, characterized in that, The included angle between the end of the cutting part (310) close to the rotation axis and the rotation axis is 60-80°.

3. A marine jetting drilling bit for use in anti-tilting and anti-vibration drilling operations, according to claim 1, characterized in that, The radial dimension of the gauge part (320) is greater than the maximum radial dimension of the cutting part (310) by 0.5-2 mm.

4. A marine jetting drilling bit for use in anti-tilting and anti-vibration drilling operations according to claim 3, characterized in that, The outer surface of the gauge part (320) is an arc surface.

5. The anti-tilting and anti-vibrating offshore jetting drilling operation bit according to claim 1, characterized in that, The cutting teeth (311) are uniformly arranged on the top end of the cutting part (310), and each cutting part (310) is provided with a plurality of rows of cutting teeth (311).

6. A marine jetting drilling bit for use in anti-tilting and anti-vibration drilling operations, according to any one of claims 1-5, characterized in that, The connecting block (100) forms a chip groove (400) between two adjacent blade wings (300), and a plurality of nozzles (500) are arranged in the chip groove (400).

7. A marine jetting drilling operation bit according to claim 6, wherein, The axes of the nozzles (500) of any two chip grooves (400) are staggered, and the included angle between the axis of the nozzle (500) and the rotation axis increases as the distance between the nozzle (500) and the rotation axis increases.

8. A marine jetting drilling operation bit according to claim 7, wherein, The included angle between the axis of the nozzle (500) and the rotation axis is 10-85°, and the angle difference between the maximum included angle and the minimum included angle between the axis of the nozzle (500) and the rotation axis is 30-75°.

9. A marine jetting drilling bit for use in anti-tilting and anti-vibration drilling operations according to claim 7, characterized in that, The water outlet of the nozzle (500) is elliptical.

10. A marine jetting drilling bit for use in anti-tilting and anti-vibration drilling operations according to claim 7, characterized in that, The cutting tooth (311) is a polycrystalline diamond compact.

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