A marine oilfield drill bit

Abstract

The present application belongs to the field of ocean engineering, and particularly relates to a marine oilfield drill bit, which comprises a drill bit and a dredging structure; the dredging structure comprises a dredging rod, a supporting rod, a No.1 sliding block and a rubber sleeve; through the dredging rod and the rubber sleeve; after the drill bit stops, due to the high water pressure of the seabed, the annular cavity in the rubber sleeve is compressed and blocked by the annular plate, so that the rubber sleeve is compressed along the reset groove, and the dredging rod is located at the top of the water eye; high-pressure water flow is introduced into the water eye, the water flow impacts the dredging rod, pushes the dredging rod to slide downward, and cooperates with the high-pressure water flow to dredge the water eye, thereby reducing the probability of water eye blockage, reducing the frequency of drill bit removal, and improving the oilfield exploitation construction progress.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of ocean engineering, in particular to a marine oilfield drill bit. BACKGROUND

[0002] Petroleum is an essential mineral resource for the current social development, and there are rich oil resources in the vast ocean. In order to develop the oil in the ocean, the marine oilfield is established in the ocean, and when the marine oilfield is opened, the drilling engineering needs to be carried out on the seabed, and the drill bit is used to penetrate the stratum of the seabed until it enters the oil layer.

[0003] A marine oilfield drill bit is disclosed in a Chinese patent with publication number CN108035681B, mainly comprising a connecting rod and a drill body, the top of the drill body is fixedly connected with the bottom plate of the connecting rod, the drill body comprises a drill bit and an auxiliary drill, and the auxiliary drill is arranged on the end face of the drill bit base body, the drill bit is conical, the auxiliary drill is a plurality of, and abrasive particles are uniformly arranged on the auxiliary drill, the water gap is formed between the adjacent two auxiliary drills, and the water gap is streamline-shaped, the plurality of auxiliary drills are enclosed to form a circular arc type around the drill bit as the central axis, the bottom of the auxiliary drill is slightly lower than the bottom of the drill bit, and the bottom of the drill bit is fixedly provided with a hard alloy layer, the present application has the advantages of simple structure, practical safety and convenience, can effectively ensure the efficiency of the drilling submersion, and ensure the service life of the drill body, the drill bit is used to drill first, then the auxiliary drill is used to open the surface, the rock stratum can be cracked under the action of the drill bit first, and the practical effect and practicability can be ensured by the overall surface opening of the auxiliary drill.

[0004] Due to the exploitation of the marine oilfield through seawater, the drill bit cannot be easily pulled up and tripped out like the drill bit of the land oilfield; the drill bit drills into the stratum of the seabed at a slow speed, especially after the drill bit stops, the mud in the drilling hole is adsorbed on the surface of the drill bit to cause mud packing of the drill bit, and in severe cases, the water eyes of the drill bit can be blocked, so that the water is not discharged smoothly, the drill bit cannot work normally, the drill bit needs to be taken out for cleaning the water eyes of the brick, the drill bit of the marine oilfield is very difficult and troublesome to trip out, which seriously affects the exploitation progress of the oilfield.

[0005] Therefore, the present application provides a marine oilfield drill bit. SUMMARY

[0006] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background art.

[0007] The technical scheme adopted by the present application to solve its technical problems is: the marine oilfield drill bit comprises a drill bit and a dredging structure; the drill bit comprises a matrix, a gauge material and a diamond compact; the bottom outer ring of the matrix is fixedly connected with the gauge material, the outer side of the gauge material is fixedly connected with a plurality of diamond compacts, the inside of the matrix is provided with a plurality of water eyes, and the inside of the water eye is provided with the dredging structure; the matrix is the main body of the drill bit and is mainly used for connecting and fixing the drill pipe and providing a support carrier for the gauge material; the gauge material is fixedly connected to the outside of the matrix to ensure the drilling diameter, and the gap between adjacent gauge materials provides a passage for the discharge of waste water and sludge; the diamond compact is the main cutting position of the drill bit and is mainly used for breaking rocks to achieve the purpose of rapid drilling; the plurality of water eyes of the matrix penetrate through the bottom of the matrix, the top of the plurality of water eyes is connected with the water channel of the drill pipe, the high-pressure water flow of the marine oilfield drilling platform sprays high-pressure water flow on the bottom of the drill hole through the water eye, and the surface of the drill bit is washed to wash out the sludge at the bottom of the drill hole.

[0008] The dredging structure comprises a dredging rod, a supporting rod, a first sliding block and a rubber sleeve; a plurality of sliding grooves are formed in the inner wall of the water eye, a reset groove is formed in the inner wall of the sliding groove, a sliding rod is fixedly connected to the inside of the reset groove, the first sliding block is slidingly installed in the inside of the reset groove, the inner ring of the first sliding block is slidingly matched with the outer ring of the sliding rod, the top surface of the first sliding block is fixedly connected with the rubber sleeve, the top surface of the rubber sleeve is fixedly connected with the top wall of the reset groove, the inner wall of the rubber sleeve is slidingly matched with the outer wall of the sliding rod, a plurality of annular cavities are formed in the inside of the rubber sleeve, an annular plate is fixedly connected to the inside of the annular cavity, the side surface of the first sliding block is fixedly connected with the supporting rod, the side wall of the supporting rod is slidingly matched with the side wall of the sliding groove, the middle part of the plurality of supporting rods is provided with the dredging rod, and the dredging rod is located in the middle part of the water eye; when the drill bit stops, the annular cavity in the rubber sleeve is compressed due to the large water pressure of the seabed, is blocked by the annular plate, and the rubber sleeve is compressed along the reset groove to drive the dredging rod to slide upward; before the drill bit starts, high-pressure water flow is introduced into the water eye, the water flow impacts the dredging rod, drives the dredging rod to slide downward, drives the first sliding block to slide downward along the reset groove, and makes the rubber sleeve stretch and reset, so that the water eye is dredged in cooperation with the high-pressure water flow, the probability of water eye blockage is reduced, the frequency of taking out the drill bit is reduced, and the oilfield construction progress is improved.

[0009] Preferably, the top end of the dredging rod is fixedly connected with a vertebral body, the curved surface of the vertebral body is provided with a plurality of arc-shaped blades, the middle part of the plurality of supporting rods is fixedly connected with a circular ring, the top outer ring of the dredging rod is provided with a ring groove, and the inner ring of the circular ring is slidingly matched with the inner ring of the ring groove; when in use, the high-pressure water flow passes through the water eye, the high-pressure water flow passes through the arc-shaped blades, drives the vertebral body to slide downward, simultaneously makes the vertebral body rotate, drives the dredging rod to rotate and slide downward, and the dredging effect of the dredging rod is further improved.

[0010] Preferably, the cross section of the support rod is streamlined, and the side with large diameter of the streamlined support rod is consistent with the water flow direction of the water eye; in use, by designing the support rod to be streamlined, the effective effect of reducing resistance in fluid is utilized to reduce the impact force of high-pressure water flow on the support rod, and the impact on the support rod is reduced, thereby reducing the probability of deformation and breakage of the support rod, and the overall safety of the dredging structure is improved.

[0011] Preferably, a plurality of fan-shaped grooves are arranged on the outer circle of the bottom of the inner wall of the water eye, arc-shaped grooves are arranged on the inner wall of the fan-shaped grooves, a plurality of fan-shaped arc plates are rotatably arranged on the outer circle of the bottom of the inner wall of the water eye, the top end of the fan-shaped arc plate is fixedly connected with a connecting rod, the connecting rod is in sliding fit with the fan-shaped groove, the bottom surface of the arc-shaped groove is fixedly connected with an arc-shaped rubber column, a plurality of elliptical cavities are arranged in the arc-shaped rubber column, a circular plate is fixedly connected in the elliptical cavity, a second sliding block is fixedly connected to the top surface of the arc-shaped rubber column, the second sliding block is in sliding fit with the arc-shaped groove, and the top end of the connecting rod is fixedly connected with the second sliding block; in use, when the drill bit stops, the elliptical cavities in the arc-shaped rubber column are compressed due to the large water pressure of the seabed, and are blocked by the circular plate, so that the arc-shaped rubber column is compressed along the arc-shaped groove, the second sliding block is driven to slide downward, the fan-shaped arc plate is driven to rotate around the rotating shaft, the plurality of fan-shaped arc plates clamp the dredging rod, and the water eye is blocked in cooperation with the dredging rod; when the high-pressure water flow passes through the water eye, the fan-shaped arc plate is pushed to rotate, the second sliding block is driven to slide upward, and the arc-shaped rubber column is stretched and reset; thereby the probability of silt entering the water eye is reduced, and the frequency of taking out the drill bit is further reduced.

[0012] Preferably, the plurality of fan-shaped arc plates form a conical body, arc-shaped openings are arranged on the bottom end of the fan-shaped arc plate, a plurality of arc-shaped openings form a circular opening, and the concave surface of the arc-shaped opening is in sliding fit with the outer wall of the dredging rod; in use, the plurality of fan-shaped arc plates are combined into a conical body, and form a conical body with an acute angle downward in cooperation with the dredging rod, so as to effectively block the pressure impact in the oil well, improve the overall strength of the fan-shaped arc plate, reduce the probability of turning over of the fan-shaped arc plate, and further improve the overall safety of the dredging structure.

[0013] Preferably, a plurality of protrusions are fixedly connected to the top outer wall of the arc-shaped groove and the top wall of the second sliding block, and the protrusions on both sides are in sliding fit; in use, when the second sliding block slides, the protrusions on both sides are in contact and sliding, so that the second sliding block vibrates, the fan-shaped arc plate vibrates, and the silt on the surface of the fan-shaped arc plate is shaken away, thereby improving the cleaning degree of the water eye.

[0014] Preferably, a plurality of circular holes are arranged on both sides of the fan-shaped arc plate, and rubber springs are fixedly connected between the circular holes on both sides; in use, the fan-shaped arc plates on both sides are pulled by the rubber springs, so that the clamping of the fan-shaped arc plates on the dredging rod is more firm.

[0015] Preferably, the concave surface of the sector-shaped arc plate is fixed with a plurality of inclined tooth plates, a plurality of water passing holes are arranged at the joint of the sector-shaped arc plate and the inclined tooth plate, the diameter of the water inlet end of the water passing hole is larger than that of the water outlet end, and a plurality of elastic vibration pieces are fixed inside the water passing hole; in use, when high-pressure water flow passes through the sector-shaped arc plate, the water flow passes through the water passing hole, and because the diameter of the water inlet end of the water passing hole is larger than that of the water outlet end, the flow rate of the water flow in the water passing hole is continuously increased, the flow rate of the water flow is increased, the elastic vibration pieces are violently vibrated, the sector-shaped arc plate is vibrated along with the elastic vibration pieces, and the silt on the surface of the sector-shaped arc plate is further shaken away, so that the cleaning degree of the water eye is further improved.

[0016] Preferably, a plurality of receiving grooves are arranged at the bottom outer ring of the dredging rod, a knocking soft rod is rotatably arranged at the top end of the receiving groove, the end of the knocking soft rod is slidably matched with the inner ring of the sector-shaped arc plate, and a magnet is arranged on the middle part of the knocking soft rod and the inner wall of the receiving groove; in use, when the high-pressure water flow in the water eye is closed, the dredging rod stops rotating, the dredging rod slides upward, the sector-shaped arc plate is folded, the sector-shaped arc plate drives the knocking soft rod to rotate, the two magnets are attracted to each other, and the knocking soft rod is received in the receiving groove; when the dredging rod rotates, the knocking soft rod is driven to rotate out of the receiving groove by the centrifugal force, the knocking soft rod hits the sector-shaped arc plate, and the vibration intensity of the sector-shaped arc plate is further improved.

[0017] The beneficial effects of the present application are as follows:

[0018] 1. The marine oil field drill of the present application is provided with a dredging rod and a rubber sleeve; after the drill stops, the water pressure of the seabed is large, the annular cavity in the rubber sleeve is compressed, is blocked by the annular plate, the rubber sleeve is compressed along the reset groove, the dredging rod is located at the top of the water eye, high-pressure water flow is introduced into the water eye, the water flow impacts the dredging rod, drives the dredging rod to slide downward, and cooperates with the high-pressure water flow to dredge the water eye, thereby reducing the probability of water eye blockage, reducing the frequency of taking out the drill, and improving the oil field construction progress.

[0019] 2. The marine oil field drill of the present application is provided with a sector-shaped arc plate, an arc-shaped rubber column and a circular plate; when the drill stops, the elliptical cavity in the arc-shaped rubber column is compressed by the water pressure, is compressed along the arc-shaped groove under the block of the circular plate, drives the sector-shaped arc plate to rotate around the rotating shaft, clamps the dredging rod, cooperates with the dredging rod to block the water eye, reduces the probability of silt entering the water eye, and further reduces the frequency of taking out the drill. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application will be further described below with reference to the drawings.

[0021] Figure 1 is a perspective view of embodiment one of the present application;

[0022] Figure 2 is the front view of the embodiment one of the present application;

[0023] Figure 3 is Figure 2 the enlarged view of A in the middle;

[0024] Figure 4 is Figure 3 the enlarged view of B in the middle;

[0025] Figure 5 is Figure 3 the enlarged view of C in the middle;

[0026] Figure 6 is Figure 3 the enlarged view of D in the middle;

[0027] Figure 7 is Figure 3 the enlarged view of E in the middle;

[0028] Figure 8 is the partial sectional view of the knock soft rod of the embodiment two of the present application.

[0029] In the figure: 1, drill bit; 2, water eye; 3, dredging rod; 4, support rod; 5, No. 1 sliding block; 6, rubber sleeve; 7, sliding groove; 8, reset slot; 9, sliding rod; 10, annular cavity; 11, annular plate; 12, vertebral body; 13, arc blade; 14, circular ring; 15, ring groove; 16, fan-shaped groove; 17, arc-shaped groove; 18, fan-shaped arc plate; 19, connecting rod; 20, arc-shaped rubber column; 21, oval cavity; 22, circular plate; 23, No. 2 sliding block; 24, arc-shaped port; 25, protrusion; 26, round hole; 27, rubber spring; 28, oblique toothed plate; 29, water passage; 30, elastic vibration piece; 31, storage groove; 32, knock soft rod; 33, magnet; 34, roller; 35, rivet; 101, carcass; 102, gage material; 103, diamond compact. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, purposes and effects realized by the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0031] Embodiment one: as Figures 1 to 4As shown, the marine oilfield drill bit comprises a drill bit 1 and a dredging structure; the drill bit 1 comprises a matrix 101, a gauge material 102 and a diamond compact 103; the outer circle of the bottom of the matrix 101 is fixedly connected with the gauge material 102, the outer side of the gauge material 102 is fixedly connected with a plurality of diamond compacts 103, a plurality of water eyes 2 are arranged in the inner part of the matrix 101, and the inner part of the water eye 2 is provided with the dredging structure; the matrix 101 is the main body of the drill bit 1 and is mainly used for connecting and fixing with a drill rod and providing a support carrier for the gauge material 102; the gauge material 102 is fixedly connected with the outer side of the matrix 101, thereby ensuring the drilling diameter of the drill bit 1, and meanwhile, the gap between the adjacent gauge materials 102 provides a passage for the discharge of waste water and sludge; the diamond compact 103 is the main cutting position of the drill bit and is mainly used for crushing rocks to achieve the purpose of rapid drilling; the plurality of water eyes 2 of the matrix 101 penetrate through the bottom of the matrix 101, the top of the plurality of water eyes 2 is connected with the water channel of the drill rod, the high-pressure water flow of the marine oilfield drilling platform sprays the high-pressure water flow to the bottom of the drill bit through the water eye 2, thereby flushing the surface of the drill bit 1 and washing out the sludge at the bottom of the drill bit 1.

[0032] The dredging structure comprises a dredging rod 3, a supporting rod 4, a first sliding block 5 and a rubber sleeve 6; a plurality of sliding grooves 7 are arranged in the inner wall of the water eye 2, a reset slot 8 is arranged in the inner wall of the sliding groove 7, a sliding rod 9 is fixedly connected with the inner part of the reset slot 8, the first sliding block 5 is slidingly installed in the inner part of the reset slot 8, the inner circle of the first sliding block 5 is slidingly matched with the outer circle of the sliding rod 9, the top surface of the first sliding block 5 is fixedly connected with the rubber sleeve 6, the top surface of the rubber sleeve 6 is fixedly connected with the top wall of the reset slot 8, the inner wall of the rubber sleeve 6 is slidingly matched with the outer wall of the sliding rod 9, a plurality of annular cavities 10 are arranged in the inner part of the rubber sleeve 6, an annular plate 11 is fixedly connected with the inner part of the annular cavity 10, the side surface of the first sliding block 5 is fixedly connected with the supporting rod 4, the side wall of the supporting rod 4 is slidingly matched with the side wall of the sliding groove 7, the middle part of the plurality of supporting rods 4 is provided with the dredging rod 3, and the dredging rod 3 is located in the middle part of the water eye 2; in use, when the drill bit 1 stops, the annular cavity 10 in the rubber sleeve 6 is compressed due to the large water pressure of the seabed, is blocked by the annular plate 11, and the rubber sleeve 6 is compressed along the reset slot 8, thereby driving the dredging rod 3 to slide upward; before the drill bit 1 starts, the high-pressure water flow is introduced into the water eye 2, the water flow impacts the dredging rod 3, drives the dredging rod 3 to slide downward, drives the first sliding block 5 to slide downward along the reset slot 8, causes the rubber sleeve 6 to stretch and reset, and cooperates with the high-pressure water flow to dredge the water eye 2, thereby reducing the probability of the water eye 2 being blocked, reducing the frequency of taking out the drill bit 1, and thereby improving the construction progress of the oil field.

[0033] As shown, Figure 3 and Figure 5As shown, the top end of the dredging rod 3 is fixed to the vertebral body 12, the curved surface of the vertebral body 12 is provided with a plurality of arc-shaped blades 13, the middle part of the plurality of support rods 4 is fixed to a circular ring 14, the outer ring of the top of the dredging rod 3 is provided with a ring groove 15, and the inner ring of the circular ring 14 and the inner ring of the ring groove 15 are in sliding fit; in use, the high-pressure water flow passes through the water eye 2, and when the high-pressure water flow passes through the arc-shaped blades 13, the vertebral body 12 is pushed to slide downward, and at the same time, the vertebral body 12 is rotated, driving the dredging rod 3 to rotate and slide downward, thereby further improving the dredging effect of the dredging rod 3.

[0034] The cross section of the support rod 4 is streamlined, and the side with large diameter of the streamlined support rod 4 is consistent with the water flow direction of the water eye 2; in use, by designing the support rod 4 to be streamlined, the effect of reducing resistance in fluid is utilized, the impact force of the high-pressure water flow on the support rod 4 is reduced, the impact on the support rod 4 is reduced, thereby reducing the probability of deformation and breakage of the support rod 4, and the overall safety of the dredging structure is improved.

[0035] As shown in Figure 3 , Figure 6 and Figure 7 , a plurality of fan-shaped grooves 16 are provided on the outer ring of the inner wall bottom of the water eye 2, an arc-shaped groove 17 is provided on the inner wall of the fan-shaped groove 16, a plurality of fan-shaped arc plates 18 are rotatably installed on the outer ring of the inner wall bottom of the water eye 2, the top end of the fan-shaped arc plate 18 is fixed to a connecting rod 19, the connecting rod 19 is in sliding fit with the fan-shaped groove 16, the bottom surface of the arc-shaped groove 17 is fixed to an arc-shaped rubber column 20, a plurality of elliptical cavities 21 are provided in the interior of the arc-shaped rubber column 20, a circular plate 22 is fixed in the interior of the elliptical cavity 21, the top surface of the arc-shaped rubber column 20 is fixed to a second sliding block 23, the second sliding block 23 is in sliding fit with the arc-shaped groove 17, and the top end of the connecting rod 19 is fixed to the second sliding block 23; in use, when the drill bit 1 stops, due to the large water pressure of the seabed, the elliptical cavities 21 in the arc-shaped rubber column 20 are compressed, blocked by the circular plate 22, and the arc-shaped rubber column 20 is compressed along the arc-shaped groove 17, driving the second sliding block 23 to slide downward and driving the fan-shaped arc plate 18 to rotate around the rotation shaft, so that the plurality of fan-shaped arc plates 18 clamp the dredging rod 3, and the water eye 2 is blocked in cooperation with the dredging rod 3; when the high-pressure water flow passes through the water eye 2, the fan-shaped arc plate 18 is pushed to rotate, driving the second sliding block 23 to slide upward, so that the arc-shaped rubber column 20 is stretched and reset; thereby reducing the probability of silt entering the water eye 2, and further reducing the frequency of taking out the drill bit 1.

[0036] A plurality of said fan-shaped arc plates 18 constitute a conical body, the bottom end of said fan-shaped arc plate 18 is provided with an arc-shaped opening 24, a plurality of said arc-shaped openings 24 constitute a circular opening, the concave surface of said arc-shaped opening 24 is in sliding fit with the outer wall of the dredging rod 3; in use, a plurality of fan-shaped arc plates 18 are combined into a conical body, cooperating with the dredging rod 3 to form a conical body with an acute angle downward, effectively blocking the pressure impact in the oil well, improving the overall strength of the fan-shaped arc plate 18, reducing the probability of the fan-shaped arc plate 18 overturning, and further improving the overall safety of the dredging structure.

[0037] The top outer wall of said arc-shaped groove 17 and the top wall of the second sliding block 23 are fixedly connected with a plurality of protrusions 25, and the two side protrusions 25 are in sliding fit; in use, when the second sliding block 23 slides, the two side protrusions 25 are in contact with sliding, so that the second sliding block 23 vibrates, driving the fan-shaped arc plate 18 to vibrate, and the silt on the surface of the fan-shaped arc plate 18 is shaken off, thereby improving the cleaning degree of the water eye 2.

[0038] A plurality of circular holes 26 are formed in the two sides of said fan-shaped arc plate 18, and rubber springs 27 are fixedly connected between the two sides of said circular holes 26; in use, the two side fan-shaped arc plates 18 are pulled by the rubber springs 27, so that the fan-shaped arc plate 18 clamps the dredging rod 3 more firmly.

[0039] A plurality of inclined tooth plates 28 are fixedly connected to the concave surface of said fan-shaped arc plate 18, a plurality of water passing holes 29 are formed at the junction of said inclined tooth plate 28 and the fan-shaped arc plate 18, the water inlet end diameter of said water passing hole 29 is larger than the water outlet end diameter, and a plurality of elastic vibration pieces 30 are fixedly connected inside said water passing hole 29; in use, when the high-pressure water flow passes through the fan-shaped arc plate 18, the water flow passes through the water passing hole 29, and because the water inlet end diameter of the water passing hole 29 is larger than the water outlet end diameter, the flow rate of the water flow in the water passing hole 29 continues to increase, causing the elastic vibration piece 30 to vibrate violently, driving the fan-shaped arc plate 18 to vibrate, and further shaking off the silt on the surface of the fan-shaped arc plate 18, thereby further improving the cleaning degree of the water eye 2.

[0040] A plurality of receiving grooves 31 are formed in the bottom outer circle of said dredging rod 3, a knocking soft rod 32 is rotatably installed at the top end of said receiving groove 31, the end of said knocking soft rod 32 is in sliding fit with the inner circle of the fan-shaped arc plate 18, and a magnet 33 is arranged on the middle part of said knocking soft rod 32 and the inner wall of said receiving groove 31, and the two side magnets 33 attract each other; in use, when the high-pressure water flow in the water eye 2 is closed, the dredging rod 3 stops rotating, the dredging rod 3 slides upward, at the same time, the fan-shaped arc plate 18 is folded, the fan-shaped arc plate 18 drives the knocking soft rod 32 to rotate, and the two side magnets 33 attract each other, so that the knocking soft rod 32 is received in the receiving groove 31; when the dredging rod 3 rotates, the knocking soft rod 32 is driven to rotate from the receiving groove 31 by the centrifugal force, so that the knocking soft rod 32 hits the fan-shaped arc plate 18, further improving the vibration intensity of the fan-shaped arc plate 18.

[0041] Example 2: Figure 8 As shown in the comparative embodiment one, another embodiment of the present invention is as follows: the end of the striking flexible rod 32 is rotatably mounted with a roller 34, and the outer ring of the roller 34 is fixed with a plurality of rivets 35; in use, when the striking flexible rod 32 slides in cooperation with the fan-shaped arc plate 18, the roller 34 rolls along the fan-shaped arc plate 18, so that the rivets 35 continuously hit the fan-shaped arc plate 18, thereby increasing the vibration frequency of the fan-shaped arc plate 18.

[0042] During operation: When drill bit 1 stops, the high-pressure water flow in water eye 2 is shut off. Due to the high water pressure at the seabed, the annular cavity 10 in rubber sleeve 6 is compressed. Blocked by annular plate 11, rubber sleeve 6 is compressed along reset groove 8, causing unblocking rod 3 to slide upward. Elliptical cavity 21 in arc-shaped rubber column 20 is compressed under water pressure. Blocked by circular plate 22, arc-shaped rubber column 20 is compressed along arc groove 17, causing second slider 23 to slide downward. This causes fan-shaped arc plate 18 to rotate around the axis. At the same time, the fan-shaped arc plates 18 on both sides are pulled by rubber spring 27. Multiple fan-shaped arc plates 18 clamp unblocking rod 3, which in turn blocks water eye 2. The fan-shaped arc plates 18 close together, pushing the striking soft rod 32 to rotate. Magnets 33 on both sides attract each other, storing the striking soft rod 32 in storage groove 31.

[0043] When drill bit 1 rotates, the high-pressure water flow in water eye 2 is activated. As the high-pressure water flows through arc-shaped blade 13, it pushes cone 12 downwards, causing cone 12 to rotate. This causes unblocking rod 3 to rotate and slide downwards, leading to slider 5 sliding downwards along reset groove 8, thus stretching and resetting rubber sleeve 6. The high-pressure water flow pushes sector-shaped arc plate 18 to rotate, causing slider 23 to slide upwards, thus stretching and resetting arc-shaped rubber column 20. As slider 23 slides, the protrusions 25 on both sides contact and slide, causing slider 23 to vibrate. This vibration causes sector-shaped arc plate 18 to vibrate, and simultaneously, the high-pressure water flow... When the fan-shaped arc plate 18 is in operation, the water flow velocity increases as the water flows through the water passage 29, causing the elastic vibrating plate 30 to vibrate violently. This vibrates the fan-shaped arc plate 18. When the unblocking rod 3 rotates, the striking flexible rod 32 is subjected to centrifugal force and rotates from the receiving groove 31. This causes the striking flexible rod 32 to strike the fan-shaped arc plate 18, increasing the vibration intensity of the fan-shaped arc plate 18 and shaking off the silt on the surface of the fan-shaped arc plate 18, thus improving the cleanliness of the water hole 2. The unblocking rod 3, in conjunction with the high-pressure water flow, unblocks the water hole 2, reducing the probability of blockage in the water hole 2, decreasing the frequency of removing the drill bit 1, and improving the progress of oilfield exploitation and construction.

[0044] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1For the sake of reference, according to the standard of the perspective of the person, the side of the device facing the observer is defined as front, the left side of the observer is defined as left, and the like.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0046] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An offshore oilfield drill bit, characterized by: The utility model provides a drill bit (1) and dredging structure, the drill bit (1) includes matrix (101), the material (102) of keeping the range and the diamond compact piece (103), the bottom outer ring of matrix (101) is fixed with the material (102) of keeping the range, the outside of material (102) is fixed with a plurality of diamond compact piece (103), the inside of matrix (101) is seted up a plurality of water eye (2), the inside of water eye (2) is provided with dredging structure, The dredging structure includes dredging rod (3), support rod (4), no. 1 sliding block (5) and rubber sleeve (6), the inner wall of water eye (2) is seted up a plurality of sliding groove (7), the inner wall of sliding groove (7) is seted up reset slot (8), the inside of reset slot (8) is fixed with sliding rod (9), no. 1 sliding block (5) is slidably installed in the inside of reset slot (8), the inner ring of no. 1 sliding block (5) is slidably connected with the outer ring of sliding rod (9), the top surface of no. 1 sliding block (5) is fixed with rubber sleeve (6), the top surface of rubber sleeve (6) is fixed with the top wall of reset slot (8), the inner wall of rubber sleeve (6) is slidably connected with the outer wall of sliding rod (9), a plurality of annular cavities (10) are formed in the inside of rubber sleeve (6), an annular plate (11) is fixed in the inside of annular cavity (10), the side surface of no. 1 sliding block (5) is fixed with support rod (4), the side wall of support rod (4) is slidably connected with the side wall of sliding groove (7), the middle part of a plurality of support rods (4) is provided with dredging rod (3), and the dredging rod (3) is located in the middle part of water eye (2). The top end of dredging rod (3) is fixed with a vertebral body (12), the curved surface of vertebral body (12) is provided with a plurality of arc-shaped blades (13), the middle part of a plurality of support rods (4) is fixed with a circular ring (14), the top outer ring of dredging rod (3) is provided with an annular groove (15), and the inner ring of circular ring (14) is slidably connected with the inner ring of annular groove (15). A plurality of sector-shaped grooves (16) are formed in the bottom outer ring of the inner wall of water eye (2), an arc-shaped groove (17) is formed in the inner wall of sector-shaped groove (16), a plurality of sector-shaped arc plates (18) are rotatably installed in the bottom outer ring of the inner wall of water eye (2), the top end of sector-shaped arc plate (18) is fixed with a connecting rod (19), the connecting rod (19) is slidably connected with sector-shaped groove (16), the bottom surface of arc-shaped groove (17) is fixed with an arc-shaped rubber column (20), a plurality of elliptical cavities (21) are formed in the inside of arc-shaped rubber column (20), a circular plate (22) is fixed in the inside of elliptical cavity (21), the top surface of arc-shaped rubber column (20) is fixed with no. 2 sliding block (23), no. 2 sliding block (23) is slidably connected with arc-shaped groove (17), and no. 2 sliding block (23) is fixed with the top end of connecting rod (19). A plurality of sector-shaped arc plates (18) form a conical body, an arc-shaped opening (24) is formed in the bottom end of sector-shaped arc plate (18), a plurality of arc-shaped openings (24) form a circular opening, and the concave surface of arc-shaped opening (24) is slidably connected with the outer wall of dredging rod (3).

2. An offshore oilfield drill bit according to claim 1, characterised in that: The cross section of the support rod (4) is streamlined, and the side with large diameter of the support rod (4) is consistent with the water flow direction of the water eye (2).

3. An offshore oilfield drill bit according to claim 1, wherein: The top outer wall of the arc-shaped groove (17) and the top wall of the second sliding block (23) are fixedly connected with a plurality of protrusions (25), and the two side protrusions (25) are in sliding fit.

4. An offshore oilfield drill bit according to claim 1, wherein: A plurality of circular holes (26) are formed in the two sides of the fan-shaped arc plate (18), and rubber springs (27) are fixedly connected between the two opposite circular holes (26).

5. An offshore oilfield drill bit according to claim 4, wherein: A plurality of oblique tooth plates (28) are fixedly connected to the concave surface of the fan-shaped arc plate (18), a plurality of water passing holes (29) are formed at the junction of the oblique tooth plate (28) and the fan-shaped arc plate (18), the diameter of the water inlet end of the water passing hole (29) is larger than that of the water outlet end, and a plurality of elastic vibration pieces (30) are fixedly connected inside the water passing hole (29).

6. An offshore oilfield drill bit according to claim 5, wherein: A plurality of accommodation grooves (31) are formed in the bottom outer ring of the dredging rod (3), a knocking soft rod (32) is rotatably installed at the top end of the accommodation groove (31), the end of the knocking soft rod (32) is in sliding fit with the inner ring of the fan-shaped arc plate (18), and magnets (33) are arranged on the middle part of the knocking soft rod (32) and the inner wall of the accommodation groove (31), and the two side magnets (33) are attracted to each other.

7. An offshore oilfield drill bit according to claim 6, wherein: The end of the knocking soft rod (32) is rotatably installed with a plurality of rollers (34), and the outer ring of the roller (34) is fixedly connected with a plurality of rivets (35).

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