CN116025288A - Quick-core-discharging type coring bit - Google Patents
Quick-core-discharging type coring bit Download PDFInfo
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- CN116025288A CN116025288A CN202111257552.7A CN202111257552A CN116025288A CN 116025288 A CN116025288 A CN 116025288A CN 202111257552 A CN202111257552 A CN 202111257552A CN 116025288 A CN116025288 A CN 116025288A
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Abstract
The invention relates to the technical field of coring bits, in particular to a rapid coring bit which comprises a coring outer barrel, wherein the outer side of the lower end of the coring outer barrel is connected with a bit body through threads, blades are fixedly arranged on the outer side of the lower end of the bit body along the circumference, PDC teeth with different sizes are fixedly arranged on the outer side of the blades, and a coring inner barrel is arranged on the inner side of the coring outer barrel. The invention has reasonable and compact structure and convenient use, and the advantages of the big and small teeth are complemented by arranging the PDC teeth with different sizes, so that the invasion capacity, aggressiveness and rock breaking efficiency of the coring bit can be considered, the working stability of the coring bit can be improved, the service life of the bit can be prolonged, the guiding capacity of the bit can be improved, the stratum adaptability of the coring bit can be enhanced, in particular the drilling performance of soft and hard staggered stratum, and the coring can be realized quickly by arranging the connecting pup joint and the guiding head which are convenient to detach at the lower ends of the coring inner cylinder and the inner cylinder pup joint.
Description
Technical Field
The invention relates to the technical field of coring bits, in particular to a quick-coring bit.
Background
Currently, PDC bits are one of the most used rock breaking tools in oil and gas drilling coring engineering. The PDC drill bit is designed into a blade type structure, PDC teeth are arranged on blade crowns of the drill bit body, and hydraulic flow passages of the drill bit are formed between blades. The PDC tooth is formed by compounding a polycrystalline diamond layer and a hard alloy base, wherein the polycrystalline diamond layer has high hardness and high wear resistance of diamond, but also has certain brittleness. The PDC teeth are generally cylindrical, and are pressed into (invaded into) a stratum by the aid of bit pressure when the PDC bit breaks rock, and the PDC teeth are scraped and broken rock under the rotation drive of the bit body. In general, the smaller the PDC tooth size (referring to the diameter size of the cylinder), the easier it is to invade the formation. But the smaller the PDC tooth size, the smaller the amount of scraping rock breaking at scraping, and the smaller the tooth coverage area. Therefore, when drilling in softer stratum, the PDC teeth with larger size are generally adopted to increase the rock scraping and breaking amount of the PDC teeth, so as to improve the drilling efficiency of the soft stratum; when drilling into hard formations, smaller size PDC teeth are typically employed to enhance the ability and depth of penetration of the PDC teeth into the formation to increase the rate of drilling.
Because the polycrystalline diamond layer of the PDC teeth has a certain brittleness, the diamond amount and the abradable height of the large-size PDC teeth are larger than those of the small-size PDC teeth, but the impact resistance of the large-size PDC teeth is weaker than that of the small-size PDC teeth. When drilling in harder formations, the PDC teeth are hard to invade the formations, and the formations have large impact damage to the PDC teeth, so that the PDC teeth with smaller sizes are generally selected in the hard formations. But the small-size PDC teeth have smaller abradable height, the PDC teeth have smaller diamond content and relatively short abrasion-resistant service life. This is the contradiction in PDC tooth selection in hard formations.
Core drilling is often not performed in a formation of relatively single lithology, and sometimes multiple formations of different hardness and lithology must be drilled through. Because the PDC teeth have certain brittleness, the stratum adaptability is relatively poor, and when the stratum changes, the damage of the PDC teeth or the generation of inadaptation conditions such as the reduction of the drilling speed of a drill bit can be brought, so that the situation of low single-pass coring footage is caused.
When the core taking operation is carried out, the outer cylinder and the inner cylinder assembly are disassembled firstly, the core grabbing mechanism at the lower part of the inner cylinder assembly is disassembled after the inner cylinder assembly is put forward, the inner cylinder assembly is moved to the front of a ramp or a drilling floor to carry out the core taking operation, the core taking process is time-consuming and labor-consuming, when the deep difficult-to-drill, loose and broken stratum is encountered in drilling, the core is broken and not formed, the inner cylinder is required to be knocked during core taking, the breaking of the core is aggravated, and difficulty is brought to later core sample selection.
Disclosure of Invention
The invention provides a quick-coring type coring bit, which overcomes the defects of the prior art, and can effectively solve the problems of contradiction in PDC tooth selection of the prior PDC bit and the problems of time and labor waste, lower construction efficiency and potential safety hazard in coring.
The technical scheme of the invention is realized by the following measures: the utility model provides a quick play heart formula coring bit, including the urceolus of coring, there is the drill bit body in the urceolus lower extreme outside of coring through threaded connection, there is the wing along circumference fixed mounting in the drill bit body lower extreme outside, wing outside fixed mounting has the PDC tooth that the size is different, the urceolus inboard of coring is equipped with the inner tube of coring, the inner tube nipple joint of lower part below the urceolus of coring is located in the inner tube lower extreme outside fixed mounting of coring, fixed mounting has the connection nipple joint between the inner tube nipple joint lower part outside and the drill bit body inboard of corresponding coring inner tube below position, it is connected with the guide head to connect nipple joint lower part inboard through the mounting, the inside fixed mounting of guide head has the core claw.
The following are further optimizations and/or improvements to the above-described inventive solution:
the PDC teeth can be arranged in a mode that large-size teeth and small-size teeth are arranged alternately.
The drill bit further comprises a spring, wherein the inner side of the upper part of the drill bit is provided with a first inner annular groove, a second inner annular groove and a third inner annular groove, the inner diameter of the first inner annular groove is sequentially reduced, the connecting nipple is located in the first inner annular groove, the outer side of the lower end of the guide head corresponding to the lower side of the first inner annular groove is provided with a mounting annular groove, a spring sleeved on the outer side of the guide head is arranged between the upper side of the mounting annular groove and the lower side of the second inner annular groove, and the lower end of the guide head is located in the third inner annular groove.
At least sixteen semicircular through-flow grooves with openings which are outwards and vertically communicated are uniformly distributed on the outer side of the connecting nipple along the circumference, and at least six water holes which are vertically communicated are circumferentially arranged on the bit body corresponding to the upper side of the first inner ring groove.
The inner side of the lower end of the connecting nipple corresponding to the upper position of the fixing screw can be provided with a positioning inner ring groove, the outer side of the guide head corresponding to the lower side of the positioning inner ring groove is provided with a positioning outer ring table, and the upper side of the positioning outer ring table is propped against the lower side of the positioning inner ring groove.
At least two internally and externally through auxiliary threaded holes can be formed in the inner barrel nipple corresponding to the position between the coring inner barrel and the connecting nipple along the circumference.
The guide head and the connecting joint are provided with a sealing ring.
The invention has reasonable and compact structure and convenient use, and the PDC teeth with larger size can improve the rock scraping and breaking amount of the drill bit and ensure the drilling speed of the drill bit in the soft stratum by arranging the PDC teeth with different sizes when the soft stratum is drilled; when drilling in hard stratum, the PDC tooth with smaller size keeps the invasion capability and aggressiveness of the drill bit, can improve the rock breaking efficiency of the coring drill bit in the hard stratum, and can quickly core through arranging the connecting nipple and the guiding head which are convenient to detach at the lower ends of the coring inner barrel and the inner barrel nipple, thereby having the characteristics of safety, labor saving, simplicity and high efficiency.
Drawings
Fig. 1 is a schematic view of a cross-sectional front view of a preferred embodiment of the present invention.
Fig. 2 is a schematic top view of the bit body of fig. 1.
Fig. 3 is an enlarged schematic view of the connecting nipple of fig. 1.
Fig. 4 is a schematic cross-sectional view of fig. 3 at A-A.
The codes in the drawings are respectively: 1 is a drill bit body, 2 is a blade, 3 is PDC tooth, 4 is a core outer cylinder, 5 is a core inner cylinder, 6 is an inner cylinder nipple, 7 is a connecting nipple, 8 is a core claw, 9 is a set screw, 10 is a guide head, 11 is a spring, 12 is a first inner ring groove, 13 is a third inner ring groove, 14 is a through groove, 15 is a water hole, 16 is a positioning outer ring platform, 17 is an auxiliary threaded hole, and 18 is a sealing ring.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present invention.
In the present invention, for convenience of description, the description of the relative positional relationship of each component is described according to the layout manner of fig. 1 of the specification, for example: the positional relationship of the front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.
The invention is further described below with reference to examples and figures:
as shown in fig. 1, 2, 3 and 4, the quick core-out type coring bit comprises a coring outer barrel 4, a bit body 1 is connected to the outer side of the lower end of the coring outer barrel 4 through threads, blades 2 are fixedly mounted on the outer side of the lower end of the bit body 1 along the circumference, PDC teeth 3 with different sizes are fixedly mounted on the outer side of the blades 2, a coring inner barrel 5 is arranged on the inner side of the coring outer barrel 4, an inner barrel nipple 6 with the lower portion below the coring outer barrel 4 is fixedly mounted on the outer side of the lower end of the coring inner barrel 5, a connecting nipple 7 is fixedly mounted between the outer side of the lower portion of the inner barrel nipple 6 corresponding to the position below the coring inner barrel 5 and the inner side of the bit body 1, a guide head 10 is connected to the inner side of the lower portion of the connecting nipple 7 through a fixing piece, and a core claw 8 is fixedly mounted on the inner side of the guide head 10.
The fixing member may be a screw, a pin, or the like, as required.
When the PDC core bit is used, PDC teeth 3 with different sizes are adopted on the blades 2 of the bit body 1, so that the adaptability of the PDC core bit to stratum is enhanced, and when a soft stratum is drilled, the PDC teeth 3 with larger sizes can improve the rock scraping and breaking amount of the bit and ensure the drilling speed of the bit in the soft stratum; the smaller size of the PDC teeth 3 maintains the invasiveness and aggressiveness of the bit when drilling into hard formations, and improves the rock breaking efficiency of the coring bit in hard formations. Therefore, the coring bit not only considers the drilling speed of the bit in soft stratum, but also ensures the rock breaking efficiency of the bit in hard stratum, greatly improves the stratum adaptability of the coring bit, ensures that the core rapidly enters the inner barrel, ensures the core formation, can be used for coring operations of various wells such as a vertical well, a directional well, a horizontal well and the like, can realize the rapid coring of the middle-long barrel by matching with the nipple pieces 6 of the inner barrel with different inner barrels, improves the working stability of the coring bit, prolongs the service life of the bit, improves the guiding capability of the bit, enhances the stratum adaptability of the coring bit, and particularly improves the drilling performance of the soft and hard staggered stratum; through setting up and connecting nipple joint 7 and guide head 10 to link together it through set screw 9, during coring, dismantle drill bit body 1 after, dismantle the mounting, can dismantle guide head 10, avoided the unable detachable problem of inner tube assembly lower part in the original structure, the rock core has been exposed after the guide head 10 is dismantled, adopts supplementary coring tool take out the rock core can, need not to propose the inner tube assembly is whole, more simple and convenient, swift.
The quick-coring bit can be further optimized or/and improved according to actual needs:
as shown in fig. 1, the PDC teeth 3 are arranged in such a manner that large-sized teeth are spaced apart from small-sized teeth. When the PDC teeth are used, the PDC teeth 3 with the same size are arranged alternately, so that the problem that the PDC teeth are easy to collapse when drilling together can be avoided.
As shown in fig. 1, the drill bit further comprises a spring 11, wherein the inner side of the upper part of the drill bit is provided with a first inner ring groove 12, a second inner ring groove and a third inner ring groove 13, the inner diameter of the first inner ring groove 12 is sequentially reduced, the connecting nipple 7 is positioned in the first inner ring groove 12, the outer side of the lower end of the guide head 10 corresponding to the lower side of the first inner ring groove 12 is provided with a mounting ring groove, a spring 11 sleeved on the outer side of the guide head 10 is arranged between the upper side of the mounting ring groove and the lower side of the second inner ring groove, and the lower end of the guide head 10 is positioned in the third inner ring groove 13. When the centering device is used, the spring 11 is arranged to buffer the centering inner cylinder 5, and the first inner annular groove 12, the second inner annular groove and the third inner annular groove 13 are arranged to limit, so that the centering inner cylinder 5 can be assisted to be centered.
As shown in fig. 3 and 4, at least sixteen semicircular through grooves 14 with outward openings and up-down through holes are uniformly distributed on the outer side of the connecting nipple 7 along the circumference, and at least six up-down through water holes 15 are formed on the drill bit body 1 corresponding to the upper side position of the first inner ring groove 12 along the circumference. When the drill bit is used, the semicircular overflow groove 14 is arranged to increase the overflow area, and rock debris is discharged from the overflow groove 14 and the water hole 15, so that the circulating pressure consumption and the pressure of coring drilling are reduced, and further, the erosion of parts is reduced.
As shown in fig. 1, 3 and 4, the lower part of the connecting nipple 7 is provided with at least two first fixing threaded holes penetrating inside and outside along the circumference, the outer side of the guide head 10 corresponding to each first fixing threaded hole is provided with a second fixing threaded hole with an outward opening, the first fixing threaded hole is internally provided with a fixing screw 9 with an inner end positioned in the second fixing threaded hole, the inner side of the lower end of the connecting nipple 7 corresponding to the upper position of the fixing screw 9 is provided with a positioning inner annular groove, the outer side of the guide head 10 corresponding to the lower side of the positioning inner annular groove is provided with a positioning outer annular table 16, and the upper side of the positioning outer annular table 16 is propped against the lower side of the positioning inner annular groove. When in use, the upper and lower positions of the first fixing threaded holes are found when the guide head 10 and the connecting nipple 7 are installed by arranging the positioning inner annular groove, so that the quick installation is facilitated.
As shown in fig. 1, at least two auxiliary threaded holes 17 which are internally and externally communicated are circumferentially arranged on the inner barrel nipple 6 corresponding to the position between the coring inner barrel 5 and the connecting nipple 7. When the core is heavy, the fixing screw 9 is inconvenient to detach, and the screw rod can be inserted into the auxiliary threaded hole 17 to prop against the core in the core, so that the weight of the lower part of the core is reduced, and the fixing screw 9 is convenient to detach for coring.
As shown in fig. 1, the guide head further comprises a sealing ring 18, and the sealing ring 18 is arranged between the guide head 10 and the connecting joint. In use, if the sealing and coring are performed, the sealing ring 18 is provided to prevent the sealing liquid from flowing out from the gap between the connection joint and the guide head 10.
The technical characteristics form the optimal embodiment of the invention, have stronger adaptability and optimal implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.
Claims (10)
1. The utility model provides a quick play heart formula coring bit, its characterized in that includes the urceolus of coring, there is the drill bit body in the urceolus lower extreme outside of coring through threaded connection, there is the wing along circumference fixed mounting in the drill bit body lower extreme outside, wing outside fixed mounting has the PDC tooth that the size is different, the urceolus inboard of coring is equipped with the inner tube of coring, the inner tube nipple joint of lower part below the urceolus of coring is located in the inner tube lower extreme outside fixed mounting of coring, fixed mounting has the connection nipple joint between inner tube nipple joint lower part outside and the drill bit body inboard of corresponding coring inner tube below position, the connection nipple joint lower part inboard is connected with the guide head through the mounting, guide head inboard fixed mounting has the rock core claw.
2. The rapid exit core drill bit of claim 1 wherein the PDC teeth are provided in a large size alternating with small size teeth.
3. The quick-release coring bit as set forth in claim 1 or 2, further comprising a spring, wherein the inner side of the upper portion of the bit is provided with a first inner ring groove, a second inner ring groove and a third inner ring groove, the inner diameter of which is sequentially reduced, the connecting nipple is located in the first inner ring groove, the outer side of the lower end of the guide head corresponding to the lower side of the first inner ring groove is provided with a mounting ring groove, a spring sleeved on the outer side of the guide head is arranged between the upper side of the mounting ring groove and the lower side of the second inner ring groove, and the lower end of the guide head is located in the third inner ring groove.
4. The quick go out heart type coring bit of claim 3, wherein at least sixteen semicircular through grooves with outward openings and up-down through holes are uniformly distributed on the outer side of the connecting nipple along the circumference, and at least six up-down through water holes are formed on the bit body corresponding to the upper side position of the first inner ring groove along the circumference.
5. The quick-release core drill bit according to claim 1, 2 or 4, wherein the lower part of the connecting nipple is provided with at least two first fixing threaded holes penetrating through the inside and the outside along the circumference, the outer side of the guide head corresponding to the position of each first fixing threaded hole is provided with a second fixing threaded hole with an outward opening, the inner end of the first fixing threaded hole is provided with a fixing screw positioned in the second fixing threaded hole, the inner side of the lower end of the connecting nipple corresponding to the position above the fixing screw is provided with a positioning inner annular groove, the outer side of the guide head corresponding to the lower side of the positioning inner annular groove is provided with a positioning outer annular table, and the upper side of the positioning outer annular table is propped against the lower side of the positioning inner annular groove.
6. The quick-release core-taking drill bit according to claim 3, wherein the lower part of the connecting nipple is provided with at least two first fixing threaded holes which are internally and externally communicated along the circumference, the outer side of the guide head corresponding to each first fixing threaded hole is provided with a second fixing threaded hole with an outward opening, the inner end of the first fixing threaded hole is provided with a fixing screw positioned in the second fixing threaded hole, the inner side of the lower end of the connecting nipple corresponding to the position above the fixing screw is provided with a positioning inner annular groove, the outer side of the guide head corresponding to the lower side of the positioning inner annular groove is provided with a positioning outer annular table, and the upper side of the positioning outer annular table is propped against the lower side of the positioning inner annular groove.
7. The quick coring bit according to claim 1, 2, 4 or 6, wherein at least two auxiliary threaded holes penetrating from inside to outside are circumferentially provided in the inner barrel nipple at positions corresponding to positions between the coring inner barrel and the connecting nipple.
8. The quick coring bit according to claim 3, wherein at least two auxiliary threaded holes penetrating from inside to outside are circumferentially provided in the inner barrel nipple at positions corresponding to positions between the coring inner barrel and the connecting nipple.
9. The rapid coring bit of claim 5, wherein at least two auxiliary threaded holes extending between the inner barrel nipple and the outer barrel nipple are circumferentially disposed in the inner barrel nipple at positions corresponding to positions between the coring inner barrel and the connecting nipple.
10. The rapid coring bit of claim 1 or 2 or 4 or 6 or 8 or 9, further comprising a seal ring, wherein a seal ring is disposed between the guide head and the connection joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111257552.7A CN116025288A (en) | 2021-10-27 | 2021-10-27 | Quick-core-discharging type coring bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111257552.7A CN116025288A (en) | 2021-10-27 | 2021-10-27 | Quick-core-discharging type coring bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116025288A true CN116025288A (en) | 2023-04-28 |
Family
ID=86078196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111257552.7A Pending CN116025288A (en) | 2021-10-27 | 2021-10-27 | Quick-core-discharging type coring bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116025288A (en) |
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2021
- 2021-10-27 CN CN202111257552.7A patent/CN116025288A/en active Pending
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