High-speed PDC drill bit for offshore oil drilling

Abstract

The utility model discloses a high-speed PDC (polycrystalline diamond compact) drill bit for offshore oil drilling, which relates to the technical field of oil PDC drill bits and comprises a drill bit unit, a connector fixedly connected to the bottom of the drill bit unit, a blade unit mounted on the outer surface of the drill bit unit and a fixing unit arranged between the drill bit unit and the blade unit. The fixing unit comprises a movable clamping rod movably arranged in the drill bit unit and an abutting conical head fixedly connected to the bottom end of the movable clamping rod and used for abutting, clamping and fixing. According to the high-speed PDC drill bit for offshore oil drilling, through the arrangement of the fixing unit, the replacement blades can be rapidly positioned, clamped and fixed in an abutting and clamping mode, the replacement blades can be conveniently detached and replaced, the whole blades do not need to be replaced, only the single abraded replacement blades need to be detached and replaced, and the replacement efficiency is greatly improved. And the economic cost is reduced, the petroleum drilling efficiency is improved, operation is easy, time and labor are saved, and good practicability is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum PDC bits, and particularly relates to a high-speed PDC bit for offshore oil drilling. Background Art

[0002] A PDC bit is short for a polycrystalline diamond compact bit, also called a polycrystalline diamond cutting block bit or a composite chip tooth bit. Since the first batch of PDC bits were developed by introducing PDC cutting blocks from General Electric Company of the United States in 1973, PDC bits have the advantages of fast drilling speed, long service life, and high dimensional accuracy. Petroleum PDC bits are commonly used drilling tools in the petroleum drilling industry. They are made by embedding or sintering small polycrystalline diamond cutting blocks onto the bit body and are widely used in soft to medium-hard formations.

[0003] Existing petroleum PDC bits usually cannot replace damaged partial cutter wings. However, replacing the cutter wings as a whole will result in high costs and reduced efficiency of petroleum drilling. Therefore, it is necessary to provide a high-speed PDC bit for offshore oil drilling. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a high-speed PDC bit for offshore oil drilling, which can effectively solve the problem that existing petroleum PDC bits usually cannot replace damaged partial cutter wings, and replacing the cutter wings as a whole will result in high costs and reduced efficiency of petroleum drilling in the background art.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows: A high-speed PDC bit for offshore oil drilling includes a bit unit, a connection head fixedly connected to the bottom of the bit unit, and a cutter wing unit installed on the outer surface of the bit unit. It also includes a fixing unit arranged between the bit unit and the cutter wing unit;

[0006] The fixing unit includes a movable clamping rod movably arranged inside the bit unit, and a counter cone head fixedly connected to the bottom end of the movable clamping rod for abutting and clamping.

[0007] Preferably, the bit unit includes a bit body, a connecting cap fixedly connected to the top of the bit body, a positioning groove opened on the outer surface of the bit body, a movable cavity opened on the outer surface of the bit body and located below the positioning groove, a first thread groove opened on the inner wall surface of the movable cavity, and a second thread groove opened on the top of the connecting cap.

[0008] Preferably, the cutter wing unit includes a plurality of replaceable cutter wings installed on the outer surface of the bit body, and a threaded hole penetrating through the top of the replaceable cutter wing.

[0009] Preferably, the fixing unit further includes a positioning block fixedly connected to one side of the bottom end of the replaceable cutter blade, a clamping hole formed in one side of the positioning block, a return spring sleeved on the outer surface of the movable clamping rod, a bolt penetrating through the inside of the movable cavity, a butting block sleeved on the outer surface of the bolt, and a fixing screw penetrating through the top of the replaceable cutter blade.

[0010] Preferably, the number of the positioning grooves is the same as that of the replaceable cutter blades, and they are distributed in an annular array on the outer surface of the drill bit body, and the movable cavity is communicated with the positioning grooves.

[0011] Preferably, the outer dimension of the positioning block is adapted to the inner dimension of the positioning groove, the inner diameter dimension of the clamping hole is adapted to the outer diameter dimension of the movable clamping rod, the return spring is fixedly connected between the inner top wall of the movable cavity and the top of the butting cone head, the bolt is threadedly connected with the first thread groove, and the fixing screw penetrates through the threaded hole and is threadedly connected with the second thread groove.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] In the utility model, first, insert the positioning block on one side of the bottom end of the replaceable cutter blade into the inside of the positioning groove of the drill bit body, and make the replaceable cutter blade fit the outer surface of the drill bit body. Then, thread the fixing screw tightly into the inside of the threaded block and enter the inside of the second thread groove for preliminary fixing of the replaceable cutter blade. Then, insert the bolt into the inside of the first thread groove in the movable cavity and turn the bolt. While turning the bolt, drive the butting block to rotate forward. The forward rotation of the butting block pushes the butting cone head, so that the butting cone head moves upward. The movement of the butting cone head drives the movable clamping rod to move upward and enter the clamping hole of the positioning block, and the butting cone head compresses the return spring during the rising process. As the bolt is tightened, the movable clamping rod firmly fixes the replaceable cutter blade. Then, repeat the above steps in sequence to install and fix the remaining replaceable cutter blades. On the contrary, after the replaceable cutter blade is worn, unscrew the fixing screw, and then screw out the bolt. Under the elastic recovery of the return spring, the movable clamping rod falls off the inside of the clamping hole, so as to disassemble and replace the replaceable cutter blade. This structure facilitates the quick positioning, clamping and fixing of the replaceable cutter blade by means of butting and clamping, and is convenient for disassembly and replacement of the replaceable cutter blade. There is no need to replace the whole cutter blade, and only the worn replaceable cutter blade needs to be disassembled and replaced, which reduces the economic cost, improves the efficiency of oil drilling, and is simple, time-saving and labor-saving in operation, and has good practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic cross-sectional and internal structure view of the utility model;

[0015] Figure 2 is the utility model Figure 1 the enlarged structure view at A in;

[0016] Figure 3 For the present utility model Figure 1 is a schematic enlarged view of the structure at position B in this utility model.

[0017] In the figure:

[0018] 100, drill bit unit; 101, drill bit body; 102, connecting cap; 103, positioning groove; 104, movable cavity; 105, first thread groove; 106, second thread groove;

[0019] 200, connector;

[0020] 300, cutter wing unit; 301, replaceable cutter wing; 302, threaded hole;

[0021] 400, fixing unit; 401, positioning block; 402, clamping hole; 403, movable clamping rod; 404, abutting cone head; 405, return spring; 406, bolt; 407, abutting block; 408, fixing screw rod. Specific embodiments

[0022] Embodiment

[0023] Please refer to Figure 1 — Figure 3 As shown in the figure, the present utility model is a high-speed PDC drill bit for offshore oil drilling, including a drill bit unit 100, a connector 200 fixedly connected to the bottom of the drill bit unit 100, and a cutter wing unit 300 installed on the outer surface of the drill bit unit 100. It also includes a fixing unit 400 arranged between the drill bit unit 100 and the cutter wing unit 300.

[0024] As Figure 1 — Figure 3 As shown in the figure, the drill bit unit 100 includes a drill bit body 101, a connecting cap 102 fixedly connected to the top of the drill bit body 101, a positioning groove 103 opened on the outer surface of the drill bit body 101, a movable cavity 104 opened on the outer surface of the drill bit body 101 and located below the positioning groove 103, a first thread groove 105 opened on the inner wall surface of the movable cavity 104, and a second thread groove 106 opened on the top of the connecting cap 102. The number of the positioning grooves 103 is the same as the number of the replaceable cutter wings 301, and they are distributed in a circular array on the outer surface of the drill bit body 101. The movable cavity 104 is communicated with the positioning groove 103.

[0025] As Figure 1 — Figure 3As shown, the cutter blade unit 300 includes a plurality of replaceable cutter blades 301 mounted on the outer surface of the drill bit body 101, and threaded holes 302 penetrating through the top of the replaceable cutter blades 301. The replaceable cutter blades 301 are convenient for replacement, thus avoiding the replacement of the whole cutter blade and reducing the economic cost. The threaded holes 302 are provided to facilitate the preliminary fixation of the replaceable cutter blades 301.

[0026] As Figure 1 — Figure 3 As shown, the fixing unit 400 includes a movable clamping rod 403 movably arranged inside the drill bit unit 100, and a counter cone head 404 fixedly connected to the bottom end of the movable clamping rod 403 for abutting and clamping. The fixing unit 400 further includes a positioning block 401 fixedly connected to one side of the bottom end of the replaceable cutter blade 301, a clamping hole 402 opened on one side of the positioning block 401, a return spring 405 sleeved on the outer surface of the movable clamping rod 403, a bolt 406 penetrating through the inside of the movable cavity 104, an abutting block 407 sleeved on the outer surface of the bolt 406, and a fixing screw 408 penetrating through the top of the replaceable cutter blade 301. The outer dimension of the positioning block 401 is adapted to the inner dimension of the positioning groove 103, the inner diameter dimension of the clamping hole 402 is adapted to the outer diameter dimension of the movable clamping rod 403, the return spring 405 is fixedly connected between the inner top wall of the movable cavity 104 and the top of the counter cone head 404, the bolt 406 is threadedly connected to the first thread groove 105, and the fixing screw 408 passes through the threaded hole 302 and is threadedly connected to the second thread groove 106.

[0027] Working principle: First, insert the positioning block 401 on one side of the bottom end of the replacement cutter blade 301 into the positioning groove 103 of the drill bit body 101, and make the replacement cutter blade 301 fit the outer surface of the drill bit body 101. Then, thread the fixing screw 408 into the interior of the threaded block 302 and enter the interior of the second threaded groove 106 to initially fix the replacement cutter blade 301. Then, insert the bolt 406 into the interior of the first threaded groove 105 inside the movable cavity 104 and turn the bolt 406. While the bolt 406 is being turned, it drives the abutting block 407 to rotate forward. The rotation and forward movement of the abutting block 407 push the abutting cone head 404, causing the abutting cone head 404 to move upward. The movement of the abutting cone head 404 drives the movable locking rod 403 to move upward and enter the locking hole 402 of the positioning block 401. During the upward movement of the abutting cone head 404, the return spring 405 is compressed. As the bolt 406 is tightened, the movable locking rod 403 firmly fixes the replacement cutter blade 301. Then, repeat the above steps in sequence to install and fix the remaining replacement cutter blades 301. On the contrary, after the replacement cutter blade 301 is worn out, unscrew the fixing screw 408, and then screw out the bolt 406. Under the elastic recovery of the return spring 405, the movable locking rod 403 falls out of the locking hole 402, thereby disassembling the replacement cutter blade 301 for replacement. This structure facilitates the quick positioning, clamping, and fixing of the replacement cutter blade 301 through the abutting and clamping method, and is also convenient for disassembly to replace the replacement cutter blade 301. There is no need to replace the entire cutter blade 301. Only the worn-out single replacement cutter blade 301 needs to be disassembled and replaced, which reduces the economic cost, improves the efficiency of oil drilling, and is simple, time-saving, and labor-saving in operation, with good practicality.

Claims

1. A high-speed PDC bit for offshore oil drilling, comprising a bit unit (100), a connector (200) fixedly connected to the bottom of the bit unit (100), and a cutter wing unit (300) installed on the outer surface of the bit unit (100), characterized in that, It further includes a fixing unit (400) disposed between the drill bit unit (100) and the cutter blade unit (300); The fixing unit (400) includes a movable clamping rod (403) movably disposed inside the drill bit unit (100), and a counter cone head (404) fixedly connected to the bottom end of the movable clamping rod (403) for abutting and clamping.

2. The high-speed PDC bit for offshore oil drilling according to claim 1, wherein: The drill bit unit (100) includes a drill bit body (101), a connecting cap (102) fixedly connected to the top of the drill bit body (101), a positioning groove (103) opened on the outer surface of the drill bit body (101), a movable cavity (104) opened on the outer surface of the drill bit body (101) and located below the positioning groove (103), a first thread groove (105) opened on the inner wall surface of the movable cavity (104), and a second thread groove (106) opened on the top of the connecting cap (102).

3. The high-speed PDC bit for offshore oil drilling according to claim 2, wherein: The cutter blade unit (300) includes a plurality of replaceable cutter blades (301) mounted on the outer surface of the drill bit body (101), and a threaded hole (302) penetratingly opened on the top of the replaceable cutter blade (301).

4. The high-speed PDC bit for offshore oil drilling according to claim 3, characterized in that: The fixing unit (400) further includes a positioning block (401) fixedly connected to one side of the bottom end of the replaceable cutter blade (301), a clamping hole (402) opened on one side of the positioning block (401), a return spring (405) sleeved on the outer surface of the movable clamping rod (403), a bolt (406) penetratingly disposed inside the movable cavity (104), an abutting block (407) sleeved on the outer surface of the bolt (406), and a fixing screw (408) penetratingly disposed on the top of the replaceable cutter blade (301).

5. The high-speed PDC bit for offshore oil drilling according to claim 4, characterized in that: The number of the positioning grooves (103) is the same as that of the replaceable cutter blades (301), and they are distributed in a circular array on the outer surface of the drill bit body (101), and the movable cavity (104) is communicated with the positioning groove (103).

6. The high-speed PDC bit for offshore oil drilling according to claim 5, characterized in that: The outer dimension of the positioning block (401) is adapted to the inner dimension of the positioning groove (103), the inner diameter dimension of the clamping hole (402) is adapted to the outer diameter dimension of the movable clamping rod (403), the return spring (405) is fixedly connected between the inner top wall of the movable cavity (104) and the top of the counter cone head (404), the bolt (406) is threadedly connected with the first thread groove (105), and the fixing screw (408) passes through the threaded hole (302) and is threadedly connected with the second thread groove (106).

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