Drill bit drilling pressure torque balancing device
By designing a drilling and pressure torque balance device for drill bits, the energy storage and supplement of the disc spring assembly is used to solve the problem of severe torque fluctuations in the soft and hard interlaced formation, and the drill bit is improved in working stability and cutting efficiency.
Patent Information
- Application Number
- CN202421692306.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-07-17
AI Technical Summary
During the drilling process, the drill bit is instable in the working state, the torque fluctuates violently, and even the drill bit is stuck and slipped, resulting in damage to the impact of the PDC cutting teeth and scrapping in advance.
A drill bit drilling and compression torque balance device is designed, including an output shaft, a lower sealing jacket, a screw jacket, an inner sealing jacket, an upper sealing jacket, a core tube, a disc spring assembly and a mounting joint. Through the compression and release of the disc spring assembly, energy is stored and replenished, the torque on the drill bit is adjusted, and a relatively stable drilling state is achieved.
It effectively balances the torque and drilling pressure fluctuations caused by the formation unevenness of the drill bit during drilling, increases the working stability of the drill bit, improves the cutting efficiency and working life, and avoids premature damage to the drill bit in an abnormally ultra-high torque environment.
Smart Images
Figure CN222731494U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of petroleum drilling tools, and in particular relates to a drilling pressure torque balancing device for a drill bit. Background Art
[0002] At present, the drill bits used for petroleum geological drilling are mainly PDC drill bits. The cutting teeth used in PDC drill bits are polycrystalline diamond composite sheets. They break rocks by scraping them during operation. They have the characteristics of fast drilling speed and large footage in soft to medium-hard formations. However, during the drilling process, the drill bit often encounters soft and hard interlaced formations, which leads to unstable working state of the drill bit, severe torque fluctuations, and even the phenomenon of the drill bit stopping and slipping, which causes the PDC cutting teeth to be damaged by impact and the drill bit to be scrapped in advance.
[0003] In view of the above problems, the prior art provides an inertial traction constant torque tool and a New-drill drilling tool to solve the problem.
[0004] Inertial traction constant torque tool (BM tool): This tool can effectively store and release energy when drilling in hard formations to make the drill bit torque relatively stable. The disadvantage is that the fatigue life of the torsion spring is limited. In addition, the tool can only work close to the drill bit.
[0005] New-drill drilling tool: This tool actively provides higher torque, and the axial drilling pressure can also play a good role in shock absorption and stabilization. The disadvantage is that the balanced torque range of the tool works within the active output maximum torque range. When the torque on the drill bit exceeds the maximum output torque of the tool, it cannot play a constant torque role. In addition, the tool has rubber parts, and its life will be limited by the life of the rubber parts. Utility Model Content
[0006] The utility model aims to provide a drill bit drilling pressure torque balancing device, which is used to solve the above problems existing in the prior art.
[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a drill bit drilling pressure torque balancing device, comprising an output shaft, a lower sealing sleeve, a screw channel outer sleeve, an inner sealing sleeve, an upper sealing sleeve, a core tube, a disc spring assembly and a mounting joint, wherein the lower sealing sleeve, the screw channel outer sleeve, the upper sealing sleeve and the mounting joint are connected in sequence, one end of the output shaft passes through the lower sealing sleeve and is inserted into the screw channel outer sleeve and is threadedly connected to the screw channel outer sleeve, the core tube is arranged on the inner side of the upper sealing sleeve, one end of the core tube is connected to the mounting joint, and an active channel adapted to the disc spring assembly is provided between the core tube and the upper sealing sleeve; the inner sealing sleeve is arranged at the end of the output shaft, and the inner sealing sleeve can move along the active channel to compress the disc spring assembly.
[0008] The utility model adopts the above-mentioned technical scheme. When the output shaft is subjected to the abnormally high torque transmitted when the drill bit is working (the rock-breaking torque output by the drill tool itself cannot meet the normal rock-breaking needs), the output shaft rotates upward along the outer sleeve of the screw channel, and compresses the disc spring assembly through the inner sealing sleeve. The disc spring assembly stores energy when it is compressed; because the axial displacement of the drill bit on the rock is reduced when the output shaft rotates upward, the positive pressure of the drill bit on the rock during rock breaking is also reduced, and the resistance torque received by the drill bit is also reduced accordingly. When the torque transmitted by the drill tool itself can meet the rock-breaking requirements, the drill bit completes the rock-breaking needs and will not produce stuttering or reverse phenomena due to insufficient energy. At the same time, the disc spring assembly moves along the core tube to release the energy stored when it is compressed to supplement the drill bit. As a result of such repeated actions, the abnormally high torque on the drill bit is adaptively adjusted like stepless speed regulation to achieve a relatively stable state, thereby avoiding early damage to the drill bit in an abnormally high torque environment.
[0009] As an optional implementation of the above technical solution, the inner wall of the outer sleeve of the screw channel is provided with a first internal thread, and one end of the output shaft is provided with a first external thread adapted to the first internal thread.
[0010] As an optional implementation of the above technical solution, the two ends of the screw channel outer sleeve are respectively provided with a second external thread and a third external thread, the lower sealing sleeve is provided with a second internal thread adapted to the second external thread, and the upper sealing sleeve is provided with a third internal thread adapted to the third external thread.
[0011] As an optional implementation of the above technical solution, one end of the output shaft extends into the movable channel, and a first sealing member is provided between the output shaft and the core tube.
[0012] As an optional implementation of the above technical solution, the first sealing member includes a plurality of first sealing rings, and the plurality of first sealing rings are all arranged between the output shaft and the core tube.
[0013] As an optional implementation of the above technical solution, a second sealing member is provided between the core tube and the mounting joint.
[0014] As an optional implementation of the above technical solution, the second sealing member includes a plurality of second sealing rings, and the plurality of second sealing rings are all arranged between the core tube and the mounting joint.
[0015] As an optional implementation of the above technical solution, the lower sealing sleeve is arranged on the outer side of the output shaft, and a third sealing member is provided between the lower sealing sleeve and the output shaft.
[0016] As an optional implementation of the above technical solution, the third sealing member includes a plurality of third sealing rings, and the plurality of third sealing rings are all arranged between the lower sealing sleeve and the output shaft.
[0017] As an optional implementation of the above technical solution, a fixing seat is provided at one end of the disc spring assembly, and the fixing seat is fixed to the mounting joint by bolts.
[0018] An outer sealing sleeve is arranged on the outer side of the output shaft, and the outer sealing sleeve is threadedly connected with the lower sealing sleeve.
[0019] The beneficial effects of the utility model are:
[0020] The utility model can balance the torque and drilling pressure fluctuations caused by the formation inhomogeneity of the drill bit during the drilling process, can increase the working stability of the drill bit, and effectively improve the cutting efficiency and working life of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a structural schematic diagram of a drill bit drilling pressure torque balancing device in one embodiment of the utility model;
[0022] Figure 2 It is a structural schematic diagram of a lower sealing sleeve, a screw channel outer sleeve, an inner sealing sleeve and an upper sealing sleeve in one embodiment of the utility model;
[0023] Figure 3 It is a schematic diagram of the layout structure of the disc spring assembly in one embodiment of the utility model.
[0024] In the figure: 1-output shaft; 2-lower sealing sleeve; 3-screw outer sleeve; 4-inner sealing sleeve; 5-upper sealing sleeve; 6-core tube; 7-disc spring assembly; 8-mounting joint; 9-first sealing member; 10-second sealing member; 11-third sealing member; 12-fixed seat; 13-outer sealing sleeve. DETAILED DESCRIPTION
[0025] like Figure 1-Figure 3 As shown, this embodiment provides a drill bit drilling pressure torque balancing device, including an output shaft 1, a lower sealing sleeve 2, a screw channel outer sleeve 3, an inner sealing sleeve 4, an upper sealing sleeve 5, a core tube 6, a disc spring assembly 7 and a mounting joint 8. The output shaft 1, the lower sealing sleeve 2, the screw channel outer sleeve 3, the upper sealing sleeve 5 and the mounting joint 8 are arranged in sequence from bottom to top, with the output shaft 1 located at the bottom, and the bottom of the output shaft 1 is connected to the PDC drill bit.
[0026] like Figure 1As shown, the lower sealing sleeve 2, the screw channel outer sleeve 3, the upper sealing sleeve 5 and the installation joint 8 are connected in sequence, the lower sealing sleeve 2 and the upper sealing sleeve 5 are both threadedly connected to the screw channel outer sleeve 3, and the upper sealing sleeve 5 is threadedly connected to the installation joint 8. One end of the output shaft 1 passes through the lower sealing sleeve 2 and is inserted into the screw channel outer sleeve 3 and threadedly connected to the screw channel outer sleeve 3. The lower sealing sleeve 2 is movably matched with the output shaft 1, and the output shaft 1 can rotate relative to the screw channel outer sleeve 3, thereby controlling the axial displacement of the drill bit on the rock.
[0027] The core tube 6 is arranged on the inner side of the upper sealing sleeve 5, one end of the core tube 6 is fixedly connected to the mounting joint 8, and a movable channel adapted to the disc spring assembly 7 is arranged between the core tube 6 and the upper sealing sleeve 5. The inner sealing sleeve 4 is arranged at the end of the output shaft 1, and the inner sealing sleeve 4 can move along the movable channel to compress the disc spring assembly 7. The disc spring assembly 7 is arranged in the movable channel, and when the output shaft 1 rotates relative to the screw outer sleeve 3, the output shaft 1 can drive the inner sealing sleeve 4 to move along the movable channel, compress the disc spring assembly 7, and achieve the function of energy storage.
[0028] After the drill bit drilling pressure torque balancing device of the utility model is connected to the PDC drill bit, the drilling pressure can be used to effectively control the cutting depth of the drill bit, and the rotation torque is used as the input control parameter to effectively offset the sudden increase in torque and stick-slip caused by the alternation of soft and hard formations in a simple way. The fluctuation of the drill bit torque is adjusted by the internal disc spring assembly 7 in conjunction with the axial movement of the output shaft 1. The disc spring assembly 7 is equipped with the corresponding preload force before entering the well according to the drilling pressure requirements of the speed-up design, ensuring that the drilling pressure and torque continuously applied to the drill bit are relatively constant, so that the drill bit works stably at the bottom of the well, effectively improving the cutting efficiency of the drill bit, while protecting the cutting teeth of the drill bit, extending the life of the drill bit, and achieving a good speed-up effect of increasing the mechanical drilling speed and the stroke drilling speed.
[0029] The utility model can balance the torque and drilling pressure fluctuations caused by the formation inhomogeneity of the drill bit during the drilling process, can increase the working stability of the drill bit, and effectively improve the cutting efficiency and working life of the drill bit.
[0030] Specifically, the inner wall of the screw channel outer sleeve 3 is provided with a first internal thread, and one end of the output shaft 1 is provided with a first external thread adapted to the first internal thread. The first external thread and the first internal thread are meshed with each other, and the output shaft 1 rotates relative to the screw channel outer sleeve 3, thereby converting the torsion of the drill bit into an axial thrust, generating pressure on the disc spring assembly 7. The two ends of the screw channel outer sleeve 3 are respectively provided with a second external thread and a third external thread, the lower sealing sleeve 2 is provided with a second internal thread adapted to the second external thread, and the upper sealing sleeve 5 is provided with a third internal thread adapted to the third external thread. The second external thread and the second internal thread are meshed with each other, and the third external thread and the third internal thread are meshed with each other, which facilitates the assembly of the lower sealing sleeve 2, the screw channel outer sleeve 3 and the upper sealing sleeve 5.
[0031] like Figure 2 As shown, one end of the output shaft 1 extends into the movable channel, and a first seal 9 is provided between the output shaft 1 and the core tube 6, and the first seal 9 includes a plurality of first seal rings, and the plurality of first seal rings are all provided between the output shaft 1 and the core tube 6. The first seal ring adopts a rubber seal ring to increase the sealing effect between the output shaft 1 and the core tube 6. A second seal 10 is provided between the core tube 6 and the mounting joint 8, and the second seal 10 includes a plurality of second seal rings, and the plurality of second seal rings are all provided between the core tube 6 and the mounting joint 8. The second seal ring adopts a rubber seal ring to increase the sealing effect between the core tube 6 and the mounting joint 8. The lower sealing sleeve 2 is provided on the outer side of the output shaft 1, and a third seal 11 is provided between the lower sealing sleeve 2 and the output shaft 1, and the third seal 11 includes a plurality of third seal rings, and the plurality of third seal rings are all provided between the lower sealing sleeve 2 and the output shaft 1. The third seal ring adopts a rubber seal ring to increase the sealing effect between the lower sealing sleeve 2 and the output shaft 1.
[0032] like Figure 3 As shown, in a specific embodiment, one end of the disc spring assembly 7 is provided with a fixing seat 12, and the fixing seat 12 is fixed to the mounting joint 8 by bolts. One end of the disc spring assembly 7 is fixed to the mounting joint 8 by the fixing seat 12, and the other end of the disc spring assembly 7 is in active contact with the inner sealing sleeve 4. An outer side of the output shaft 1 is provided with an outer sealing sleeve 13, and the outer sealing sleeve 13 is threadedly connected to the lower sealing sleeve 2.
[0033] The working principle of the drill bit drilling pressure torque balancing device of the utility model is as follows: when the output shaft 1 is subjected to the abnormal ultra-high torque transmitted when the drill bit is working (the rock-breaking torque output by the drill tool itself cannot meet the normal rock-breaking needs), the output shaft 1 rotates upward along the outer sleeve 3 of the screw channel, and compresses the disc spring assembly 7 through the inner sealing sleeve 4. The disc spring assembly 7 stores energy when it is compressed; because the axial displacement of the drill bit on the rock is reduced when the output shaft 1 rotates upward, the positive pressure of the drill bit on the rock during rock breaking is also reduced, and the resistance torque received by the drill bit is also reduced accordingly. When the torque transmitted by the drill tool itself can meet the rock breaking requirements, the drill bit completes the rock breaking needs and will not produce stuttering or reverse phenomena due to insufficient energy. At the same time, the disc spring assembly 7 moves along the core tube 6 to release the energy stored when it is compressed to supplement the drill bit. As a result of such repeated actions, the abnormal ultra-high torque on the drill bit is adaptively adjusted like stepless speed regulation to achieve a relatively stable state, thereby avoiding early damage to the drill bit under an abnormal ultra-high torque environment.
[0034] In the description of the present utility model, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, and may be fixedly connected, detachably connected, or integrated; may be mechanically connected or electrically connected; may be directly connected or indirectly connected through an intermediate medium, may be the internal connection of two components or the interaction relationship between two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood. In addition, the specific features, structures, etc. described in the embodiments are included in at least one embodiment. In the absence of mutual contradictions, those skilled in the art may combine the features of different embodiments. The scope of protection of the present utility model is not limited to the above-mentioned specific embodiments. According to the basic technical concept of the present utility model, the embodiments that can be associated with by ordinary technicians in this field without creative work all belong to the scope of protection of the present utility model.
Claims
1. A drill bit drilling pressure torque balancing device, characterized in that: The invention comprises an output shaft (1), a lower sealing sleeve (2), a screw channel outer sleeve (3), an inner sealing sleeve (4), an upper sealing sleeve (5), a core tube (6), a disc spring assembly (7) and a mounting joint (8); the lower sealing sleeve (2), the screw channel outer sleeve (3), the upper sealing sleeve (5) and the mounting joint (8) are connected in sequence; one end of the output shaft (1) passes through the lower sealing sleeve (2) and is inserted into the screw channel outer sleeve (3) and is threadedly connected to the screw channel outer sleeve (3); the core tube (6) is arranged on the inner side of the upper sealing sleeve (5); one end of the core tube (6) is connected to the mounting joint (8); a movable channel adapted to the disc spring assembly (7) is provided between the core tube (6) and the upper sealing sleeve (5); the inner sealing sleeve (4) is arranged at the end of the output shaft (1), and the inner sealing sleeve (4) can move along the movable channel to compress the disc spring assembly (7).
2. The drill bit pressure-on-bit torque balancing device according to claim 1, characterized in that: The inner wall of the screw channel outer sleeve (3) is provided with a first internal thread, and one end of the output shaft (1) is provided with a first external thread matching the first internal thread.
3. The drill bit pressure-on-bit torque balancing device according to claim 2, characterized in that: The two ends of the screw channel outer sleeve (3) are respectively provided with a second external thread and a third external thread, the lower sealing sleeve (2) is provided with a second internal thread matched with the second external thread, and the upper sealing sleeve (5) is provided with a third internal thread matched with the third external thread.
4. The drill bit pressure-on-bit torque balancing device according to claim 1, characterized in that: One end of the output shaft (1) extends into the movable channel, and a first sealing member (9) is provided between the output shaft (1) and the core tube (6).
5. The drill bit pressure-on-bit torque balancing device according to claim 4, characterized in that: The first sealing member (9) comprises a plurality of first sealing rings, and the plurality of first sealing rings are all arranged between the output shaft (1) and the core tube (6).
6. The drill bit pressure-on-bit torque balancing device according to claim 1, characterized in that: A second sealing member (10) is provided between the core tube (6) and the mounting joint (8); the second sealing member (10) comprises a plurality of second sealing rings, and the plurality of second sealing rings are all provided between the core tube (6) and the mounting joint (8).
7. The drill bit pressure-on-bit torque balancing device according to claim 1, characterized in that: The lower sealing sleeve (2) is arranged on the outside of the output shaft (1), and a third sealing member (11) is arranged between the lower sealing sleeve (2) and the output shaft (1).
8. The drill bit pressure-on-bit torque balancing device according to claim 7, characterized in that: The third sealing member (11) comprises a plurality of third sealing rings, and the plurality of third sealing rings are all arranged between the lower sealing sleeve (2) and the output shaft (1).
9. The drill bit pressure-on-bit torque balancing device according to claim 1, characterized in that: A fixing seat (12) is provided at one end of the disc spring assembly (7), and the fixing seat (12) is fixed to the mounting joint (8) by means of bolts.
10. The drill bit pressure-on-bit torque balancing device according to claim 1, characterized in that: An outer sealing sleeve (13) is provided on the outer side of the output shaft (1), and the outer sealing sleeve (13) is threadedly connected to the lower sealing sleeve (2).