CN112081530A - PDC drill bit with buffer gear - Google Patents
PDC drill bit with buffer gear Download PDFInfo
- Publication number
- CN112081530A CN112081530A CN202011127823.2A CN202011127823A CN112081530A CN 112081530 A CN112081530 A CN 112081530A CN 202011127823 A CN202011127823 A CN 202011127823A CN 112081530 A CN112081530 A CN 112081530A
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- CN
- China
- Prior art keywords
- central shaft
- drill bit
- composite sheet
- pdc
- bolt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
- F16F15/067—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Mining & Mineral Resources (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a PDC drill bit with a buffer mechanism, which comprises: PDC composite sheet, center pin, buffer spring, fixing bolt, thrust bolt, etc. The PDC composite sheet is connected with the central shaft through welding; the fixed bolt and the thrust bolt are linked together with the central shaft through threads; the buffer spring is sleeved on the central shaft and is fixed between the step at the top of the central shaft and the fixing bolt. The PDC composite sheet is when cutting stratum because of taking place instantaneous striking between stick-slip effect and the shaft bottom rock, and the PDC composite sheet promotes the center pin in proper order, fixing bolt and stopping bolt toward drill bit body mounting groove internal motion, and buffer spring between center pin and the fixing bolt is compressed during the motion, plays the cushioning effect to the instantaneous striking between the PDC composite sheet and the shaft bottom rock, reduces instantaneous effort by a wide margin, avoids the PDC composite sheet to take place to collapse and decreases.
Description
Technical Field
The invention relates to the field of petroleum and natural gas drilling, in particular to a PDC drill bit with a buffer mechanism.
Background
The demand of deep wells and ultra-deep wells is gradually increased along with the exploration and development of shallow oil and gas reservoirs. In the deep drilling process, the proportion of complex and difficult-to-drill stratums is increased year by year. Because the stick-slip effect of the PDC drill bit causes the compact of the PDC drill bit to collapse and lose, the failure is fast, the service life is short, the mechanical drilling speed is low, and the use range of the PDC drill bit is greatly limited and the drilling cost of a deep well is improved. In order to solve the problem, a knob impactor, a 360-bit drill and the like are researched and developed at home and abroad to improve the single footage of the drill. The operating principle of the knob impactor is that through an internal unique flow channel structure, the fluid energy of drilling fluid is converted into circumferential, high-frequency, uniform and stable circumferential mechanical impact force, and the circumferential mechanical impact force is directly transmitted to the PDC drill bit so as to eliminate the stick-slip problem of the PDC drill bit. The 360-bit drill bit can rotate in the process of breaking rock by the composite sheet, so that the surrounding of the composite sheet can participate in breaking rock, and the utilization rate of the PDC composite sheet is improved. The torque impactor and the 360 drill bit can improve the drilling speed of the drill bit by only advancing to different degrees, and the drilling period is shortened. But the problems of failure, erosion, pressure loss and the like exist in the working process of the torsion impactor; when the 360-bit composite sheet collides with rock at the bottom of a well at a high speed, the 360-bit composite sheet does not have a buffer device, so that the composite sheet is easy to collapse and damage, and the mechanical drilling rate is reduced. Therefore, in order to improve the single-pass and rate of penetration of the drill bit, it is necessary to develop a device having a rotating composite sheet capable of cushioning the impact of the composite sheet with the rock at high speed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the PDC drill bit with the buffer mechanism, when the PDC drill bit breaks rock, the PDC composite sheet can not only rotate, but also play a role in buffering when the composite sheet and the rock impact at a high speed, so that the collapse loss of the composite sheet is reduced, the mechanical drilling speed is increased, and the single drilling footage is increased.
In order to solve the technical problems, the invention adopts the technical scheme that: a PDC drill bit with a buffer mechanism comprises a drill bit body and a PDC composite sheet located at the front end of the drill bit body, wherein the front end of the drill bit body is provided with a mounting circular groove with three-level inner diameters sequentially reduced, threads are turned on the inner wall of a second-level mounting circular groove, a central shaft is cylindrical with three-level inner diameters sequentially reduced, the central shaft is inserted into the mounting circular groove, the diameter of the front section of the central shaft is matched with the front section of the mounting circular groove, the top end of the front section of the central shaft is connected with the cylindrical PDC composite sheet at the front end of the drill bit body, and the diameter of the front; the middle section of the central shaft is sleeved with a buffer spring coaxial with the central shaft and a fixing bolt with a screw thread on the outer wall, the outer wall of the fixing bolt is in threaded connection with the inner wall of the second-stage installation circular groove, one end of the buffer spring is propped against the bottom of the front section of the central shaft, and the other end of the buffer spring is propped against the fixing bolt; the lower section of the central shaft is provided with external threads, the backstop bolt is a hollow cylinder with internal threads and is connected with the lower section of the central shaft through threads, and the bottom of the backstop bolt is provided with two symmetrical and parallel mounting keys; the drill bit body at the bottom of the mounting circular groove is provided with two symmetrical parallel mounting key grooves matched with the two mounting keys and a buffer groove matched with the lower section of the central shaft.
The top of center pin anterior segment links together through welding and the compound piece of PDC.
The invention has the beneficial effects that: the composite sheet of the PDC drill bit can play a role in buffering when being impacted with rocks at a high speed at the bottom of a well, and the collapse loss of the composite sheet is reduced.
Drawings
Fig. 1 is a schematic view of a PDC bit compact buffering mechanism.
In the figure: 1 composite sheet, 2 center pins, 3 buffer springs, 4 fixing bolts, 5 stopping bolts and 6 drill bit bodies.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in figure 1, the PDC drill bit with the buffer mechanism comprises a drill bit body 6 and a PDC composite sheet 1 positioned at the front end of the drill bit body, wherein the front end of the drill bit body 6 is provided with a mounting circular groove 6-3 with three-level inner diameters sequentially reduced, the inner wall of a second-level mounting circular groove is provided with threads, a central shaft 2 is in a cylindrical shape with three-level inner diameters sequentially reduced, the central shaft 2 is inserted into the mounting circular groove 6-3, the diameter of the front section 2-1 of the central shaft is matched with that of the front section of the mounting circular groove 6-3, the top end of the front section 2-1 of the central shaft is connected with the cylindrical PDC composite sheet 1 at the front end of the drill bit body, and the diameter of the; the middle section 2-2 of the central shaft is sleeved with a buffer spring 3 which is coaxial with the central shaft and a fixing bolt 4 with a screw thread on the outer wall, the outer wall of the fixing bolt 4 is in threaded connection with the inner wall of the second-stage installation circular groove, one end of the buffer spring 3 is propped against the bottom of the front section 2-1 of the central shaft, and the other end of the buffer spring is propped against the fixing bolt 4; the lower section 2-3 of the central shaft is provided with external threads, the backstop bolt 5 is a hollow cylinder with internal threads and is connected with the lower section 2-3 of the central shaft through threads, and the bottom of the backstop bolt 5 is provided with two symmetrical and parallel mounting keys 5-1; the drill bit body at the bottom of the mounting circular groove 6-3 is provided with two symmetrical parallel mounting key grooves 6-1 matched with the two mounting keys 5-1 and a buffer groove 6-2 matched with the lower section 2-3 of the central shaft.
The top end of the front section 2-1 of the central shaft is connected with the PDC composite sheet 1 through welding.
The installation step: firstly, welding the PDC composite sheet and a central shaft together; secondly, the retaining bolt is arranged in the mounting circular groove of the drill bit body, and the mounting key of the retaining bolt is ensured to be positioned in the mounting key groove in the mounting circular groove; thirdly, the fixing bolt is connected with the drill bit body through threads; fourthly, the damping spring is sleeved on the central shaft, and the central shaft 2-3 penetrates through the fixing bolt and is connected with the backstop bolt through threads.
The PDC composite sheet is connected together in a welding and thread connection mode to form a mechanism which enables the PDC composite sheet to rotate in the circumferential direction and move in the axial direction. The PDC composite sheet is joined to the central shaft 2-1 by welding, and transmits axial and circumferential movements generated when the rock is chipped to the central shaft. The central shaft 2-2 is sleeved with a damping spring, the central shaft 2-3 is connected with a backstop bolt through threads, a fixing bolt is arranged between the backstop bolt and the damping spring, and the fixing bolt is sleeved on the central shaft. The buffer spring is sleeved on the central shaft 2-2 and plays a role in buffering when the composite sheet collides with stratum rock at a high speed. The fixed bolt is sleeved on the central shaft, the outside of the fixed bolt is connected with the drill bit body through threads, the backstop bolt is limited in the inner groove of the drill bit body from bottom to top and is contacted with the buffer spring from top to bottom. The retaining bolt is connected with the lower part of the central shaft through threads. A round groove is arranged on the drill bit body in a turning mode; the mounting circular groove is provided with a thread which is matched with the thread on the fixing bolt; the deepest part of the mounting circular groove is provided with a mounting key groove in a turning mode and is matched with a retaining bolt mounting key.
In summary, the disclosure of the present invention is not limited to the above-mentioned embodiments, and persons skilled in the art can easily set forth other embodiments within the technical teaching of the present invention, but such embodiments are included in the scope of the present invention.
Claims (2)
1. The PDC drill bit with the buffer mechanism comprises a drill bit body (6) and a PDC composite sheet (1) located at the front end of the drill bit body, and is characterized in that the front end of the drill bit body (6) is turned with an installation circular groove (6-3) with three-level inner diameters sequentially reduced, threads are turned on the inner wall of a second-level installation circular groove, a central shaft (2) is in a cylindrical shape with three-level diameters sequentially reduced, the central shaft (2) is inserted into the installation circular groove (6-3), the diameter of the front section (2-1) of the central shaft is matched with that of the front section of the installation circular groove (6-3), the top end of the front section (2-1) of the central shaft is connected with the cylindrical PDC composite sheet (1) at the front end of the drill bit body, and the diameter of the front section (2-; the middle section (2-2) of the central shaft is sleeved with a buffer spring (3) coaxial with the central shaft and a fixing bolt (4) with a screw thread on the outer wall, the outer wall of the fixing bolt (4) is in threaded connection with the inner wall of the second-stage installation circular groove, one end of the buffer spring (3) is propped against the bottom of the front section (2-1) of the central shaft, and the other end of the buffer spring is propped against the fixing bolt (4); the lower section (2-3) of the central shaft is provided with external threads, the backstop bolt (5) is a hollow cylinder with internal threads and is connected with the lower section (2-3) of the central shaft through threads, and the bottom of the backstop bolt (5) is provided with two symmetrical and parallel mounting keys (5-1); two symmetrical parallel mounting key grooves (6-1) matched with the two mounting keys (5-1) and a buffer groove (6-2) matched with the lower section (2-3) of the central shaft are arranged on the drill bit body at the bottom of the mounting circular groove (6-3).
2. The PDC bit with a damping mechanism according to claim 1, wherein the tip of the front section (2-1) of the central shaft is joined to the PDC composite sheet (1) by welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011127823.2A CN112081530A (en) | 2020-10-20 | 2020-10-20 | PDC drill bit with buffer gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011127823.2A CN112081530A (en) | 2020-10-20 | 2020-10-20 | PDC drill bit with buffer gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112081530A true CN112081530A (en) | 2020-12-15 |
Family
ID=73730592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011127823.2A Pending CN112081530A (en) | 2020-10-20 | 2020-10-20 | PDC drill bit with buffer gear |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112081530A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1348528A2 (en) * | 2002-03-25 | 2003-10-01 | HILTI Aktiengesellschaft | Guiding insert for a core drill |
| CN201963201U (en) * | 2011-03-28 | 2011-09-07 | 李亚军 | Drill bit for foundation piling |
| CN207485361U (en) * | 2017-09-30 | 2018-06-12 | 湖北康辉石业有限公司 | One kind opens rock drill bit |
| CN210152562U (en) * | 2019-06-22 | 2020-03-17 | 高伟 | Shock attenuation drill bit for oil drilling |
| CN111058773A (en) * | 2019-12-25 | 2020-04-24 | 谢昕怡 | Rock drilling bit device and machining and manufacturing method of rock drilling bit |
| CN211342776U (en) * | 2019-11-20 | 2020-08-25 | 中国地质大学（北京） | Drilling, sampling and real-time measuring integrated drilling tool |
-
2020
- 2020-10-20 CN CN202011127823.2A patent/CN112081530A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1348528A2 (en) * | 2002-03-25 | 2003-10-01 | HILTI Aktiengesellschaft | Guiding insert for a core drill |
| CN201963201U (en) * | 2011-03-28 | 2011-09-07 | 李亚军 | Drill bit for foundation piling |
| CN207485361U (en) * | 2017-09-30 | 2018-06-12 | 湖北康辉石业有限公司 | One kind opens rock drill bit |
| CN210152562U (en) * | 2019-06-22 | 2020-03-17 | 高伟 | Shock attenuation drill bit for oil drilling |
| CN211342776U (en) * | 2019-11-20 | 2020-08-25 | 中国地质大学（北京） | Drilling, sampling and real-time measuring integrated drilling tool |
| CN111058773A (en) * | 2019-12-25 | 2020-04-24 | 谢昕怡 | Rock drilling bit device and machining and manufacturing method of rock drilling bit |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20201215 |