Telescopic crushing type PDC (Polycrystalline Diamond Compact) drill bit for petroleum drilling

Abstract

The utility model relates to the technical field of petroleum PDC (Polycrystalline Diamond Compact) drill bits, and discloses a telescopic crushing type PDC drill bit for petroleum drilling, which comprises a PDC drill bit body, a replaceable drilling mechanism comprises six sliding locking blocks, the six sliding locking blocks are connected outside the PDC drill bit body in a sliding manner, and the six sliding locking blocks are connected with the PDC drill bit body in a sliding manner. Connecting locking blocks are slidably connected to the sides, close to each other, of the two sliding locking blocks, replaceable blades are fixedly connected to the exteriors of the six sliding locking blocks, and fixing screws are connected to the interiors of the replaceable blades in a threaded mode. According to the PDC drill bit, by rotating the two fixing screws located in the replacement blade, the threaded connection between the fixing screws and the PDC drill bit body is loosened, then the replacement blade is pushed, the sliding locking blocks are driven by the replacement blade to slide, and then the sliding locking blocks leave the sliding limiting grooves between the sliding locking blocks; therefore, the fixing screw can be quickly detached, and the maintenance rate of the drill bit is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of petroleum PDC drill bit, especially relates to a telescopic broken PDC drill bit for petroleum drilling. BACKGROUND

[0002] Petroleum drilling refers to the process of drilling a hole in the ground to extract oil and natural gas. During drilling, the drill bit cuts through the rock by rotating and pressing, causing the hole to gradually deepen until it reaches the oil and gas reservoir. The principle of petroleum drilling relies on the rotation and pressure of the drill bit to generate a rotating cutting force in the rock, which breaks the rock and carries the debris out of the well. At the same time, drilling fluid is used to cool the drill bit and remove the drill cuttings. Broken PDC drill bits (polycrystalline diamond compact drill bits) are a type of high-efficiency drill bit that uses a hard diamond layer on the surface of the drill bit to cut through the rock, making it better able to handle hard rock and have a longer service life and higher drilling speed. The relationship between petroleum drilling and PDC drill bits is that PDC drill bits are often used in modern petroleum drilling, and their high efficiency improves the efficiency of drilling operations, especially when dealing with hard rock;

[0003] The working principle of the broken PDC (polycrystalline diamond composite material) drill bit for petroleum drilling mainly relies on the physical contact between the PDC blades on the surface of the drill bit and the rock formation, which breaks the rock through the cutting action generated by high-speed rotation. PDC blades have extremely high hardness and wear resistance, which can effectively handle the challenge of hard rock. During drilling, the cutting force generated by the rotation of the drill bit causes the rock particles to be gradually broken and peeled off, and the design of the drill bit allows it to better transmit drilling force, thereby improving drilling efficiency and reducing drill bit wear. This broken cutting method makes PDC drill bits perform high-efficiency drilling in petroleum drilling, especially in hard rock and complex formations;

[0004] In the prior art, some petroleum PDC drill bits are damaged due to different degrees of wear on the contact surface, but the existing petroleum PDC drill bits cannot replace the damaged part of the blade, and replacing the entire blade will result in high cost and reduced efficiency of petroleum drilling. Therefore, a telescopic broken PDC drill bit for petroleum drilling is proposed to solve the above problems. UTILITY MODEL CONTENTS

[0005] In order to make up for the above shortcomings, the utility model provides a telescopic broken PDC drill bit for petroleum drilling, which aims to improve the problem that some petroleum PDC drill bits are damaged due to different degrees of wear on the contact surface in the prior art, and the existing petroleum PDC drill bits cannot replace the damaged part of the blade.

[0006] In order to achieve the above object, the utility model discloses the following technical scheme: a telescopic broken PDC drill bit for petroleum drilling, including PDC drill bit body, the outside detachable connection of PDC drill bit body has replaceable drilling mechanism, the inside screw connection of PDC drill bit body has telescopic mechanism,

[0007] The replaceable drilling mechanism includes six sliding locking blocks, six sliding locking blocks are slidably connected to the outside of the PDC drill bit body, two sliding locking blocks are slidably connected to the proximal side of the connecting locking block, six sliding locking blocks are slidably connected to the proximal side of the connecting locking block, and the inside of the replacement blade is fixedly connected to a plurality of arc grooves, and the inside of the replacement blade is fixedly connected to a plurality of arc grooves.

[0008] As a further description of the above technical scheme: the telescopic mechanism includes a tip shaft, the tip shaft is screw connected to the inside of the PDC drill bit body, the tip shaft is fixedly connected to the outside of the inner ring shaft, the tip shaft is fixedly connected to the outside of the outer ring shaft, the tip shaft and the outer ring shaft are fixedly connected to the proximal side of the coupling teeth, and the outer ring shaft and the inner ring shaft are coupled to each other.

[0009] As a further description of the above technical scheme: the rear side of the sliding locking block is provided with a sliding groove, and the sliding locking blocks are slidably connected in the sliding groove.

[0010] As a further description of the above technical scheme: two sliding locking blocks are provided with a limiting groove on the proximal side, and the connecting locking block is slidably connected in the limiting groove.

[0011] As a further description of the above technical scheme: the top end of the tip shaft is a funnel-shaped block, the tip shaft is a block composed of two cylinders, the bottom end of the tip shaft is provided with a thread on the outside, and the bottom of the tip shaft is connected with a drill power source.

[0012] As a further description of the above technical scheme: the inside of the replacement blade is provided with a mounting groove, and the fixed screw is screw connected in the mounting groove.

[0013] As a further description of the above technical scheme: the connecting locking block is a square block, and the limiting groove is a square groove.

[0014] As a further description of the above technical scheme: the top of the PDC drill bit body is provided with a contraction hole, and the tip shaft is slidably connected in the contraction hole.

[0015] The utility model has the following beneficial effects:

[0016] 1. The utility model discloses, can through the rotation of the two fixed screws in the replacement blade inside, make fixed screw loose and the thread connection of PDC drill bit body, after pushing the replacement blade, the sliding locking block is driven to slide by the replacement blade, then the sliding locking block leaves the sliding limit slot between the sliding locking block, thereby realize the quick disassembly of fixed screw, improve the maintenance rate to drill bit, and then improve the working efficiency of drill bit.

[0017] 2. The utility model discloses, through the rotation of the tip shaft, make the tip shaft drive the outer ring shaft fixed in the tip shaft outside to rise along with, know the outer ring shaft and the inner ring shaft are coupled each other and are fixed, when not needing the tip shaft to the petroleum drilling carries out the auxiliary, can through the rotation of the tip shaft, make the tip shaft slide down and contract in the inside of PDC drill bit body, this makes the drill bit under the condition of soft and hard staggered formation can effectively improve the rock breaking efficiency, prolongs the drill bit life, saves the drilling cost. ACCURACY OF DRAWINGS

[0018] Figure 1 A telescopic broken PDC drill bit for petroleum drilling is provided.

[0019] Figure 2 A telescopic broken PDC drill bit for petroleum drilling is provided.

[0020] Figure 3 A telescopic broken PDC drill bit for petroleum drilling is provided.

[0021] Figure 4 A telescopic broken PDC drill bit for petroleum drilling is provided.

[0022] LEGEND:

[0023] 1, PDC drill bit body, 2, sliding locking block, 3, replacement blade, 4, arc slot, 5, fixed screw, 6, tip shaft, 7, connecting locking block, 8, inner ring shaft, 9, coupling tooth, 10, outer ring shaft. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0025] Refer toFigure 1 、 Figure 2 The utility model provides an embodiment: a telescopic broken PDC drill bit for petroleum drilling, including PDC drill bit body 1, PDC drill bit body 1 is the core component of the tool, is used for supporting and fixing the working structure of whole drill bit, the outside of PDC drill bit body 1 is detachably connected with replaceable drilling mechanism, and the inside screw thread connection of PDC drill bit body 1 has telescopic mechanism,

[0026] Replaceable drilling mechanism includes six sliding locking blocks 2, and the sliding locking block 2 can be slidably connected on the outside of PDC drill bit body 1, and the stable connection of replacement blade wing 3 with drill bit body is ensured.Each sliding locking block 2 has locking mechanism, so as to lock replacement blade wing 3 in the appropriate position, avoid loose, and six sliding locking blocks 2 are slidably connected on the outside of PDC drill bit body 1, and the similar side of two sliding locking blocks 2 is slidably connected with connecting locking block 7, and connecting locking block 7 is used to ensure the mutual connection and locking of multiple sliding locking blocks 2, increase the stability of structure, and the outside of six sliding locking blocks 2 is fixedly connected with replacement blade wing 3, and replacement blade wing 3 is the cutting part of drill bit, is fixedly connected on sliding locking block 2, can replace different blade wing to adapt to different working environment or improve drilling efficiency, and the inside of replacement blade wing 3 is fixedly connected with multiple arc grooves 4, and arc groove 4 is used to dig rock, and the inside screw thread connection of replacement blade wing 3 has fixed screw 5, and fixed screw 5 is used to fix replacement blade wing 3 in the mounting groove of sliding locking block 2, to ensure that blade wing does not loosen or fall off during use, and the rear side of sliding locking block 2 is provided with sliding groove, and sliding locking block 2 is slidably connected in sliding groove, and the rear side of sliding locking block 2 is provided with sliding groove, and sliding locking block 2 is slidably connected in sliding groove, and the inside of replacement blade wing 3 is provided with mounting groove, and fixed screw 5 is screw threadedly connected in mounting groove, and connecting locking block 7 is square block, and limiting groove is square groove.

[0027] Referring to Figure 3 、 Figure 4The telescopic mechanism comprises a tip shaft 6 which is connected with the PDC drill bit body 1 through threads and is a key component of the whole telescopic mechanism. The bottom end of the tip shaft 6 is connected with the power source of the drill bit, the tip shaft 6 is threadedly connected in the inside of the PDC drill bit body 1, the outside of the tip shaft 6 is fixedly connected with an inner ring shaft 8, the outside of the tip shaft 6 is fixedly connected with an outer ring shaft 10, the inner ring shaft 8 and the outer ring shaft 10 are fixedly connected in the tip shaft 6 and the PDC drill bit body 1 respectively, forming a mutual coupling fixed structure, a plurality of coupling teeth 9 are fixedly connected on the side close to the tip shaft 6 and the outer ring shaft 10, the coupling teeth 9 are used to ensure that the inner ring shaft 8 and the outer ring shaft 10 can stably cooperate with each other, avoiding the situation of loosening or unstable structure, so as to ensure the smooth operation of the telescopic mechanism, the outer ring shaft 10 and the inner ring shaft 8 are coupled with each other, the top end of the tip shaft 6 is a funnel-shaped block, the top end of the tip shaft 6 is designed as a funnel shape, so as to better guide the cutting direction of the drill bit during operation, reducing unnecessary friction and resistance, the tip shaft 6 is a block composed of two cylinders, the bottom end of the tip shaft 6 is provided with threads outside, the bottom of the tip shaft 6 is connected with the drill bit power source, the top of the PDC drill bit body 1 is provided with a telescopic hole, the telescopic hole is used to install the tip shaft 6, and the telescopic function is realized through sliding fit. The design of the telescopic hole needs to be accurate to ensure the smooth sliding of the tip shaft 6 and that no jamming phenomenon occurs during telescopic process, the tip shaft 6 is slidingly connected in the telescopic hole.

[0028] Working principle: connect the tip shaft 6 with the drill bit power source, then align the bottom of the PDC drill bit body 1 with the tip shaft 6, then rotate the PDC drill bit body 1, drive the tip shaft 6 into the inside of the PDC drill bit body 1 through the threads outside the bottom end of the tip shaft 6, and the outer ring shaft 10 outside the tip shaft 6 and the coupling teeth 9 on the top of the outer ring shaft 10 are coupled with the inner ring shaft 8 inside the PDC drill bit body 1 and the coupling teeth 9 on the bottom of the inner ring shaft 8, thereby completing the fixation of the PDC drill bit body 1.

[0029] When it is needed to shrink the tip shaft 6 for protection, the tip shaft 6 can be shrunk into the inside of the PDC drill bit body 1 through the rotation of the PDC drill bit body 1 and the threads outside the tip shaft 6.

[0030] When it is needed to replace the replacement blade wing 3, the fixed screw 5 inside the replacement blade wing 3 can be rotated to separate the fixed screw 5 from the replacement blade wing 3, then the replacement blade wing 3 is pushed to drive the sliding locking block 2 fixed in the replacement blade wing 3, so that the sliding locking block 2 is separated from the sliding groove inside the sliding locking block 2, thereby completing the replacement of the replacement blade wing 3.

[0031] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, the spirit and principles of the present application, made any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A retractable PDC (Power Destroyer Control) drill bit for oil drilling, comprising a PDC drill bit body (1), characterized in that: The PDC drill bit body (1) is externally detachably connected to a replaceable drilling mechanism, and the PDC drill bit body (1) is internally threadedly connected to a telescopic mechanism. The replaceable drilling mechanism includes six sliding locking blocks (2), which are slidably connected to the outside of the PDC drill bit body (1). Two of the sliding locking blocks (2) are slidably connected to a connecting locking block (7) on their adjacent sides. Replacement cutter wings (3) are fixedly connected to the outside of each of the six sliding locking blocks (2). Multiple arc-shaped grooves (4) are fixedly connected inside the replacement cutter wings (3). Fixed screws (5) are threaded inside the replacement cutter wings (3).

2. The retractable PDC drill bit for oil drilling according to claim 1, characterized in that: The telescopic mechanism includes a tip shaft (6), which is threadedly connected to the inside of the PDC drill bit body (1). An inner ring shaft (8) is fixedly connected to the outside of the tip shaft (6), and an outer ring shaft (10) is fixedly connected to the outside of the tip shaft (6). Multiple coupling teeth (9) are fixedly connected to the adjacent side of the tip shaft (6) and the outer ring shaft (10). The outer ring shaft (10) and the inner ring shaft (8) are coupled to each other.

3. The retractable PDC drill bit for oil drilling according to claim 1, characterized in that: The sliding locking block (2) has a sliding groove on its rear side, and the sliding locking blocks (2) are slidably connected to each other in the sliding groove.

4. The retractable PDC drill bit for oil drilling according to claim 1, characterized in that: Limiting grooves are provided on the adjacent sides of the two sliding locking blocks (2), and the connecting locking block (7) is slidably connected in the limiting grooves.

5. A retractable PDC drill bit for oil drilling according to claim 2, characterized in that: The top of the tip shaft (6) is a funnel-shaped block. The tip shaft (6) is a block composed of two cylinders. The bottom of the tip shaft (6) is threaded. The bottom of the tip shaft (6) is connected to the drill bit power source.

6. A retractable PDC drill bit for oil drilling according to claim 1, characterized in that: The replacement blade (3) has an internal mounting groove, and the fixing screw (5) is threaded into the mounting groove.

7. A retractable PDC drill bit for oil drilling according to claim 4, characterized in that: The connecting locking block (7) is a square block, and the limiting groove is a square groove.

8. A retractable PDC (Power Cutting Device) drill bit for oil drilling according to claim 2, characterized in that: The top of the PDC drill bit body (1) is provided with a shrinkage hole, and the tip shaft (6) is slidably connected in the shrinkage hole.

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