CN107386981B - Bit nipple - Google Patents
Bit nipple Download PDFInfo
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- CN107386981B CN107386981B CN201710693832.XA CN201710693832A CN107386981B CN 107386981 B CN107386981 B CN 107386981B CN 201710693832 A CN201710693832 A CN 201710693832A CN 107386981 B CN107386981 B CN 107386981B
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- guide
- boss
- joint
- sub
- wall
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- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/24—Drilling using vibrating or oscillating means, e.g. out-of-balance masses
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- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
Abstract
The invention provides a bit nipple. The drill bit nipple comprises an upper joint, a lower joint, a guide piece and an elastic piece; an upper boss and a lower boss are arranged on the inner wall of the upper joint, and a containing cavity is formed between the upper boss and the lower boss; the side wall of the accommodating cavity is provided with a plurality of guide ribs and guide grooves; the bottom of the guide rib forms a guide inclined plane; the guide piece comprises a top wall provided with a main flow hole and a side wall connected with the top wall; the top wall is abutted with the upper boss; the side wall is provided with a secondary flow hole and a lower abutting part; an upper ratchet wheel is arranged at the top end of the lower joint, and a ratchet wheel of the upper ratchet wheel is in butt joint with the lower butt joint part; the top end is extended to form a flange, and an elastic piece is arranged between the flange and the lower boss; the lower abutting part can slide in the guide groove to drive the ratchet to contact with or separate from the guide inclined surface, so that the drainage effect of the auxiliary flow hole is opened or closed. The drill bit nipple reduces the friction resistance of the drill string and the rock chip bed in the axial direction and the circumferential direction, avoids the phenomenon that the drill bit sticks to slide or is stuck and blocked, and improves the drilling efficiency.
Description
Technical Field
The invention relates to the technical field of oil and gas drilling, in particular to a drill bit nipple.
Background
In the drilling process of the horizontal well, the gap between the drill string and the well wall is wide in upper part and narrow in lower part due to the gravity action of the drill string in the horizontal well section, the flow velocity in the narrow gap is small, and the gravity action of the rock debris is added, so that the rock debris is deposited on the well wall below and is not easy to clean, and a rock debris bed is formed. The rock chip bed not only increases the frictional resistance in the circumferential direction between the drill string and the well wall, so that the rotating speed of the drill string is reduced, but also increases the axial frictional resistance between the drill string and the well wall, so that the drill bit is not subjected to bit pressure, the problems of bit stick slip or bit sticking, bit jamming and the like are caused, and the drilling efficiency is seriously affected.
In the existing horizontal drilling process, a mode of 'reverse pile drilling tool' is often adopted, namely: the drill rod or the drill collar with larger wall thickness, gravity and rigidity is arranged at a position close to a wellhead, namely, at a vertical section of the drill string, and the gravity of the drill rod or the drill collar is utilized to provide additional axial force for the drill string at a horizontal section so as to offset the friction resistance in the axial direction of the drill string, thereby avoiding the generation of dragging pressure.
However, the drill string of the inverted pile drilling tool still has larger friction resistance with the circumferential direction of the rock debris bed, so that the problems of drill bit sticking and sliding or jamming, jamming and the like can also occur.
Disclosure of Invention
The invention provides a drill bit nipple to realize axial and circumferential vibration of a drill bit and avoid the phenomenon of stick-slip of the drill bit.
The invention provides a bit nipple, comprising: the upper joint, the lower joint, the guide piece and the elastic piece; an upper boss and a lower boss are arranged on the inner wall of the upper joint, and a containing cavity for containing the guide piece is formed between the upper boss and the lower boss; the inner side wall of the accommodating cavity is provided with a plurality of guide ribs, and a guide groove is formed between two adjacent guide ribs; the bottom of the guide rib forms a guide inclined plane; the guide includes: a top wall and a side wall connected to the top wall; the top wall is abutted with the upper boss, and a main flow hole is arranged on the top wall; the side wall is provided with a secondary flow hole and a lower abutting part accommodated in the guide groove; the top end of the lower joint is provided with an upper ratchet wheel, and the ratchet wheel of the upper ratchet wheel is accommodated in the guide groove and is abutted with the lower abutting part; the top end extends towards the inner side wall of the accommodating cavity to form a flange, and an elastic piece is arranged between the flange and the lower boss; the lower abutting part can slide in the guide groove to drive the ratchet teeth of the upper ratchet wheel to contact with or separate from the guide inclined surface, so that the drainage effect of the auxiliary flow hole is opened or closed.
The drill nipple is characterized in that a plurality of auxiliary flow holes are formed in the drill nipple at intervals along the circumferential direction of the side wall.
The drill nipple is characterized in that a gap is formed between a part of the side wall and the inner side wall of the accommodating cavity, and the auxiliary flow holes are formed in the part.
The bit nipple as described above, wherein the secondary flow hole is opened on the top surface of the lower abutment.
The drill bit nipple is characterized in that the guide rib is provided with the drainage groove, and the auxiliary flow hole is formed in the position of the side wall facing the drainage groove.
The drill bit nipple is characterized in that each drainage groove is correspondingly provided with a secondary flow hole.
The bit sub as described above wherein the lower abutment comprises a lower ratchet engaged with an upper ratchet.
The drill bit nipple is characterized in that a sealing mechanism is further arranged between the upper connector and the lower connector, and the sealing mechanism is located below the lower boss.
The bit nipple as described above, wherein the sealing mechanism comprises an annular groove formed in the inner wall of the upper joint or the outer wall of the lower joint, and a sealing ring installed in the annular groove.
The drill bit nipple is characterized in that the upper connector is fixedly connected with the drill rod, and the lower connector is fixedly connected with the drill bit.
According to the drill bit nipple, the guide piece can slide downwards along the guide groove of the upper joint through the pressure difference generated by the main flow hole of the guide piece, and then the lower joint is pushed to slide downwards through the lower abutting part and the upper ratchet wheel which are abutted, so that axial vibration is generated; the ratchet teeth of the lower joint slide upwards along the guide inclined plane of the guide rib in a rotating way through the drainage function of the auxiliary flow holes and the elasticity of the elastic piece, so that circumferential vibration is generated. The periodic vibration of the bit nipple in the axial direction and the circumferential direction can effectively reduce the friction resistance of the drill string and the rock chip bed in the axial direction and the circumferential direction, avoid the occurrence of stick-slip or jamming and jamming of the bit, and further improve the drilling efficiency.
Drawings
FIG. 1 is a cross-sectional view of a bit sub of the present invention;
FIG. 2 is a cross-sectional view of an upper joint of the present invention;
FIG. 3 is a schematic view of the guide structure of the present invention;
FIG. 4 is a schematic view of the lower joint structure of the present invention;
fig. 5 is a cross-sectional view of the lower joint of the present invention.
Reference numerals illustrate:
100: an upper joint; 110: an upper boss;
120: a lower boss; 130: a receiving chamber;
131: a guide rib; 132: a guide groove;
133: a guide slope; 134: a drainage groove;
140: an annular groove; 150: an external thread;
200: a guide member; 210: a top wall;
211: a main flow hole; 220: a sidewall;
221: a secondary flow hole; 222: a lower abutting portion;
223: a lower ratchet wheel; 224: a guide rail;
300: the lower joint: 310: an upper ratchet wheel;
311: a ratchet; 312: a flange;
313: a connection end; 320: a central flow aperture;
330: an internal thread; 400: an elastic member;
500: and (3) a sealing ring.
Detailed Description
The following detailed description of the embodiments of the invention is provided in connection with the accompanying drawings, it being understood that the embodiments described herein are for purposes of illustration and explanation only, and the invention is not limited to the embodiments described below.
In the present invention, the "upper" direction refers to a position near one end of the drill rod, and the "lower" direction refers to a position near one end of the drill bit.
FIG. 1 is a cross-sectional view of a bit sub of the present invention; FIG. 2 is a cross-sectional view of an upper joint of the present invention; FIG. 3 is a schematic view of the guide structure of the present invention; FIG. 4 is a schematic view of the lower joint structure of the present invention; fig. 5 is a cross-sectional view of the lower joint of the present invention.
Referring to fig. 1 to 5, the present embodiment provides a bit nipple, including: an upper joint 100, a lower joint 300, a guide 200, and an elastic member 400; the inner wall of the upper joint 100 is provided with an upper boss 110 and a lower boss 120, and a receiving cavity 130 for receiving the guide 200 is formed between the upper boss 110 and the lower boss 120; the inner side wall of the accommodating cavity 130 is formed with a plurality of guide ribs 131, and a guide groove 132 is formed between two adjacent guide ribs 131; the bottom of the guide rib 131 forms a guide slope 133; the guide 200 includes: a top wall 210 and a side wall 220 connected to the top wall; the top wall 210 is abutted with the upper boss 110, and a main flow hole 211 is arranged on the top wall 210; the side wall 220 has a sub-flow hole 221 formed therein and a lower abutment 222 accommodated in the guide groove 132; the top end of the lower joint 300 is provided with an upper ratchet wheel 310, and a ratchet 311 of the upper ratchet wheel 310 is accommodated in the guide groove 132 and abuts against the lower abutting part 222; a flange 312 is formed on the top end extending toward the inner side wall of the accommodating cavity 130, and an elastic member 400 is arranged between the flange 312 and the lower boss 120; the lower abutment 222 is capable of sliding in the guide groove 132 to drive the ratchet 311 of the upper ratchet 310 into contact with or out of contact with the guide slope 133, thereby opening or closing the drainage of the auxiliary flow hole 221.
Specifically, referring to fig. 1 and 2, the inner wall of the upper joint 100 is provided with an upper boss 110 for restricting the guide 200, and the upper boss 110 may be a separately provided part fixedly connected to the inner wall of the upper joint 100 or may be integrally formed with the upper joint 100. The inner wall of the upper joint 100 is further provided with a lower boss 120 for cooperating with the lower joint 300 to limit the elastic member 400, and the lower boss 120 may be fixed to the inner wall of the upper joint 100 by welding, clamping, etc.; alternatively, the upper joint 100 may include an upper portion provided with the upper boss 110 and a lower portion provided with the lower boss 120, which are fixedly coupled together by screw threads or a snap fit or the like. The upper and lower bosses 110 and 120 are formed with a receiving chamber 130, an inner sidewall of the receiving chamber 130 is formed with a plurality of guide ribs 131, a guide groove 132 is formed between two adjacent guide ribs 131, the guide ribs 131 may be two or four, six, etc., and the present invention is not limited thereto. The bottom of each guide rib 131 forms a guide slope 133 for guiding the ratchet 311 of the lower joint 300 to slide. In order to enable the ratchet 311 to smoothly slide along the guide inclined surface 133, the inclined surface of the guide inclined surface 133 may have an angle of [30 °,60 ° ] with respect to the axial direction, and the present embodiment preferably has an angle of 45 °. Of course, the guide slope 133 may be inclined rightward or leftward, and the present invention is not particularly limited.
Referring to fig. 1 and 3, the guide 200 includes a top wall 210 and a side wall 220 connected to the top wall 210, and the top wall 210 and the side wall 220 are preferably formed integrally by forging or casting, but the invention is not limited thereto. The top wall 210 is abutted with the upper boss 110, and a main flow hole 211 is arranged on the top wall 210, so that drilling fluid flows from the main flow hole 211 to the drill bit direction. The main flow hole 211 may be a round hole or an elliptical hole, or may be a square hole, a polygonal hole or other irregularly shaped holes, which is not limited herein. The side wall 220 is formed with a sub-flow hole 221 and a lower abutment 222, and a channel communicating between the sub-flow hole 221 and the inner side wall of the receiving chamber 130 is provided, for example, a gap is provided between the inner side wall of the receiving chamber 130 and the sub-flow hole 221, so that the drilling fluid can flow from the sub-flow hole 221 toward the drill bit. The lower abutment 222 includes a guide rail 224, and the guide rail 224 is accommodated in the guide groove 132 to guide the up-and-down sliding of the guide 200. The lower abutting portion 222 is slidable in the guide groove 132 via the guide rail 224, so that the guide 200 is driven to slide up and down, the auxiliary flow hole 221 is opened or closed, and the drilling fluid can intermittently flow from the auxiliary flow hole 221.
Referring to fig. 1, 4 and 5, the lower joint 300 is centrally provided with a central flow hole 320, through which high pressure drilling fluid flows to the drill bit. The top end of the lower joint 300 is provided with an upper ratchet 310, the upper ratchet 310 comprises a ratchet 311 and a connecting end 313, the ratchet 311 is connected with the lower joint 300 through the connecting end 313, the ratchet 311 is accommodated in the guide groove 132 and abuts against the lower abutting part 222, and the guide 200 pushes the ratchet 311 to slide downwards along the guide groove 132 through the lower abutting part 222. In order to enable smooth sliding of the ratchet 311 when contacting the guide slope 133, it is preferable that the ratchet 311 is provided with a slope, and the slope angle of the slope may or may not coincide with the slope angle of the guide slope 133. The present invention is not limited to the specific structure of the ratchet. The top end of the lower connector 300 extends to the inner wall of the upper connector 100 to form a flange 312, the flange 312 and the connecting end 313 are integrally formed, an elastic member 400 is arranged between the flange 312 and the lower boss 120, and the flange 312 and the lower boss 120 cooperate to limit the elastic member 400 to move up and down.
The elastic member 400 is disposed between the flange 312 and the upper boss 110, and may be a rubber member or a coil spring, and the present invention is not particularly limited.
In order to ensure that the auxiliary flow hole 211 can be normally opened or closed to achieve the drainage effect, in this embodiment, the sliding travel of the main flow hole 211, the auxiliary flow hole 221, the guide member 200 and the rigidity of the elastic member 400 can be set by referring to the following formula, and those skilled in the art can calculate the correlation between the above-mentioned materials in other suitable manners:
wherein K is the rigidity of the elastic member 400, P is the pump pressure of the slurry pump, A 1 An area A of the main flow hole 211 2 The area of the sub-flow hole 221 is L, which is the stroke distance of the guide 200.
For ease of understanding, the working principle of the present invention is described in detail below with reference to specific parameters. First, it should be noted that during the drilling process, the drill rod and the drill bit simultaneously perform a rotational movement and an axial forward movement. Referring to fig. 1 to 5, in an initial state, the upper surface of the guide 200 abuts against the lower surface of the upper boss 110, and the sub-flow hole 221 is closed. While the main flow hole 211 of the guide 200 has a cross-sectional area a 1 The high pressure drilling fluid pumped at P forms a pressure difference at both sides of the top wall 210 of the guide member 200 smaller than the area of the drill pipe flow passage, the lower abutment 222 of the guide member 200 slides down the guide groove 132 of the upper sub 100 under the pressure, and the lower sub 300 is pushed to slide down by the ratchet 311 abutted with the lower abutment 222, and at the same time, the elastic member 400 between the flange 312 and the upper boss 110 is compressed. In this process, the lower joint 300 is blocked by the guide rib 131 of the upper joint 100 in the circumferential directionThe upper ratchet 310 does not undergo rotational movement and maintains the same rotational speed as the upper joint 100. When the sliding distance to the guide 200 exceeds the travel distance L, at this time, the ratchet 311 of the lower joint 300 passes over the tip of the lowermost end of the guide slope 133 of the bottom of the guide rib 131 of the upper joint 100, the upper ratchet 310 is not limited by the circumferential direction of the guide rib 131, and at the same time, the auxiliary flow hole 221 of the guide 200 is opened, a portion of the high pressure drilling fluid flows downward through the auxiliary flow hole 221, which corresponds to the increase of the flow area of the main flow hole 211, the pressure difference formed at both sides of the top wall 210 of the guide 200 is decreased, the compressed elastic member 400 is extended, the elastic force pushes the ratchet 311 of the upper ratchet 310 to slide upward along the guide slope 133 by the flange 312 of the lower joint 300 until the elastic member 400 is restored, the guide 200 is restored to the original state, the auxiliary flow hole 221 is closed, and one action cycle is completed. The pressure on both sides of the top wall 210 of the guide 200 increases gradually again, entering the next rotation cycle.
According to the drill bit nipple, the guide piece can slide downwards along the guide groove of the upper joint due to the pressure difference generated by the main flow hole of the guide piece, and then the lower joint is pushed to slide downwards through the lower abutting part and the upper ratchet wheel which are in abutting connection, so that axial vibration is generated; the ratchet teeth of the lower joint slide upwards along the guide inclined plane of the guide rib in a rotating way through the drainage function of the auxiliary flow holes and the elasticity of the elastic piece, so that circumferential vibration is generated. The periodic vibration of the drill bit nipple in the axial direction and the circumferential direction can effectively reduce the friction resistance of the drill string and the rock chip bed in the axial direction and the circumferential direction, so that the phenomenon that the drill bit is stuck or stuck and blocked is avoided, and the drilling efficiency is further improved.
Further, the sub-flow holes 221 are provided in plurality at intervals along the circumferential direction of the sidewall 220. Specifically, the number of the auxiliary flow holes 221 may be 2 or 4, and the auxiliary flow holes 221 may be circular or elliptical, or may be polygonal or irregular, and the number and shape of the auxiliary flow holes are not limited in the present invention. For convenience of processing, the sub-flow hole 221 of the present embodiment is preferably a circular hole. Of course, in the embodiment in which the plurality of auxiliary flow holes 221 are provided, in the calculation formula of the rigidity K of the elastic member 400, the area a of the auxiliary flow holes 221 2 Is the sum of the areas of the plurality of sub-flow holes 221.
In order to achieve the drainage effect of the auxiliary flow hole, a portion of the sidewall 220, on which the auxiliary flow hole 221 is opened, is provided with a gap with the inner wall of the receiving chamber 130. Specifically, there is a gap between the sidewall 220 and the inner wall of the accommodating chamber 130, and the accommodating chamber 130 may be provided with a groove portion, and there is a gap between the sidewall 220 and the groove portion, and there may be a gap between a portion of the sidewall 220 and the inner wall of the accommodating chamber 130. The auxiliary flow hole 221 is opened at a portion having a gap through which the high pressure drilling fluid flows into the auxiliary flow hole through the gap, thereby achieving drainage of the auxiliary flow hole.
In one embodiment, the auxiliary flow hole 221 is opened on the top surface of the lower abutment 222. Specifically, the auxiliary flow hole 221 is formed above the guide rail 224 of the lower abutting portion 222, the guide rail 224 is accommodated in the guide groove 132 and can slide along the guide groove 132, correspondingly, the distance between the upper end of the guide groove 132 and the upper boss 110 is L, when the guide member 200 slides downward beyond the travel distance L, the high-pressure drilling fluid sequentially passes through the guide groove 132 and the auxiliary flow hole 221 and merges with the high-pressure drilling fluid flowing through the main flow hole 211, the drainage effect of the auxiliary flow hole is started, and the pressure on both sides of the top wall 210 of the guide member 200 is reduced, so that the lower joint 300 can move upwards along the guide inclined plane 133 in a rotating manner under the effect of the elastic member 400.
In another embodiment, the guide rib 131 is provided with the drainage groove 134, and the sub-flow hole 221 is opened at a position where the sidewall 220 faces the drainage groove 134. Specifically, the guide ribs 131 extend downward from the upper boss 110 along the axial direction of the accommodating chamber 130, the guide ribs 131 are provided in plurality, guide grooves 132 are formed between two adjacent guide ribs 131, and guide slopes 133 are formed at the bottom ends of the guide ribs 131 and the adjacent guide grooves 132. The drainage groove 134 is disposed on the guide rib 131, and the distance between the upper end of the drainage groove 134 and the upper boss 110 is L, and the axial length of the drainage groove 134 may occupy two thirds of the length of the guide rib 131, but the invention is not limited thereto. When the guide member 200 slides down over the travel distance L, the high pressure drilling fluid sequentially passes through the drainage groove 134 and the auxiliary flow hole 221, merges with the high pressure drilling fluid flowing through the main flow hole 211, opens the drainage function of the auxiliary flow hole, reduces the pressure at both sides of the top wall 210 of the guide member 200, and allows the lower joint 300 to move upward along the guide slope 133 in a rotating manner under the action of the elastic member 400. The plurality of drainage grooves 134 may be provided in one-to-one correspondence with the sub-flow holes 221, or the plurality of sub-flow holes 221 may be provided in one drainage groove 134, or the sub-flow holes 221 may be provided in an arc shape along the circumferential direction of the sidewall 220 of the guide 200 such that the plurality of drainage grooves 134 correspond to one sub-flow hole.
On the basis of the embodiment, in order to facilitate processing, the processing difficulty is increased and the structural strength is reduced by avoiding too many drainage grooves, and each drainage groove 134 is correspondingly provided with a secondary flow hole 221. For example, as an alternative embodiment, the inner wall of the receiving chamber 130 is provided with eight guide ribs 131 in the circumferential direction, and eight guide grooves 132 and four guide slopes 133 are formed correspondingly. Every other guide rib 131 is provided with four drainage grooves, and correspondingly, four auxiliary flow holes 221 are formed along the circumferential direction of the side wall 220 of the guide member 200 at positions facing the drainage grooves 134. The number of the guide ribs and the guide grooves, the drainage grooves and the auxiliary flow holes is not limited, and can be set according to practical situations by a person skilled in the art.
With continued reference to fig. 3, the lower abutment 222 includes a lower ratchet 223 engaged with the upper ratchet 310. In order to make the ratchet 311 slide smoothly along the guide slope 133 after passing over the tip of the lowest surface of the guide slope 133, the lower end of the lower abutment 222 of the present embodiment is provided with a lower ratchet 223 engaged with the upper ratchet 310. The track S of the guide edge at the lower end of the lower ratchet 223 can be referred to
The calculation is performed by adopting other suitable calculation formulas. Wherein S is a guide edge track, A is a track peak value, < >>
Is of initial phase and ranges from 0 DEG to 90 DEG]. The alternative track peak A of this embodiment is 12, ω is 16pi, initial phase +.>
25 DEG, formSuch as the sinusoidal leading edge shown in fig. 3. At this time, in the initial state, the guide 200 is abutted against the upper boss 110, the drainage of the auxiliary flow hole 221 is closed, the side edges of the ratchet 311 of the upper ratchet wheel 310 of the lower joint 300 are blocked by the guide rib 131, and the inclined surface of the ratchet 311 is contacted with the inclined surface of the guide edge of the lower ratchet wheel 223, and does not reach the bottom end of the guide edge. The ratchet 311 of the lower coupling 300 passes over the tip of the lowermost end of the guide slope 133 of the bottom of the guide rib 131 of the upper coupling 100, the upper ratchet 310 is not limited by the circumferential direction of the guide rib 131, the ratchet 311 of the upper ratchet 310 is rotated to slide upward along the slope of the guide edge, and the ratchet 311 can be rotated to slide upward along the guide slope 133 more smoothly due to the initial sliding force of the ratchet 311 by the rotational guiding action of the guide edge. The track of the guide edge in the present invention is not limited thereto, and those skilled in the art may set the track according to actual situations. Of course, the track S of the guide edge at the lower end of the lower ratchet 223 may be designed according to a cosine function.
Referring to fig. 1, in order to prevent leakage of the high pressure drilling fluid to the cavity between the upper and lower joints, a sealing mechanism is further provided between the upper and lower joints 100 and 300, and the sealing mechanism is located under the lower boss 120. Specifically, in order to prevent the drilling fluid in the annulus of the well wall, the upper joint, and the lower joint from entering the cavity accommodating the elastic member 400, a sealing structure is provided under the lower boss 120. Of course, in order to prevent the high pressure drilling fluid flowing into the auxiliary flow hole from leaking down into the cavity accommodating the elastic member 400, a sealing structure is provided at a portion where the flange 312 of the lower joint 300 contacts the inner wall of the accommodating chamber 130 of the upper joint 100.
Further, the sealing mechanism includes an annular groove 140 opened on the inner wall of the upper joint 100 or the outer wall of the lower joint 300, and a sealing ring 500 installed in the annular groove 140. Specifically, an annular groove 140 is provided at the lower end of the lower boss 120 of the upper joint 100, and a seal ring 500 is installed in the annular groove 140; alternatively, an annular groove is formed in the outer wall of the lower joint 300, and the seal ring 500 is installed in the annular groove to achieve sealing. The sealing ring can be a rubber sealing ring or a copper sealing ring, the structure and the material of the sealing ring are not particularly limited, and the sealing ring can be arranged according to practical application conditions by a person skilled in the art.
In this embodiment, the upper joint 100 is fixedly connected to the drill rod, and the lower joint 300 is fixedly connected to the drill bit. The upper joint 100 is fixedly connected with the drill rod, and can be clamped, screwed or the like. In order to make the connection more stable, the upper joint 100 and the drill rod are preferably connected by threads, and the upper joint 100 may be provided with external threads 150, the drill rod may be provided with internal threads matching the external threads 150, or the upper joint 100 may be provided with internal threads, and the drill rod may be provided with external threads matching the internal threads. The lower connector 300 is fixedly connected with the drill bit, and can be clamped, screwed or the like. The lower connector 300 and the drill bit in this embodiment are preferably connected through threads, and the lower connector 300 may be provided with external threads, the drill bit may be provided with internal threads matched with the external threads, the lower connector 300 may be provided with internal threads 330, and the drill rod may be provided with external threads matched with the internal threads 330. The threads can be triangular threads, rectangular threads and the like, and the specific structure of the threads is not limited by the invention.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. A bit sub, comprising: the upper joint, the lower joint, the guide piece and the elastic piece;
an upper boss and a lower boss are arranged on the inner wall of the upper joint, and a containing cavity for containing the guide piece is formed between the upper boss and the lower boss; a plurality of guide ribs are formed on the inner side wall of the accommodating cavity, and guide grooves are formed between two adjacent guide ribs; the bottom of the guide rib forms a guide inclined plane;
the guide includes: a top wall and a side wall connected to the top wall; the top wall is abutted with the upper boss, and a main flow hole is formed in the top wall; the side wall is provided with a secondary flow hole and a lower abutting part accommodated in the guide groove;
an upper ratchet wheel is arranged at the top end of the lower joint, and a ratchet wheel of the upper ratchet wheel is accommodated in the guide groove and is abutted with the lower abutting part; the top end extends towards the inner side wall of the accommodating cavity to form a flange, and the elastic piece is arranged between the flange and the lower boss;
the lower abutting part can slide in the guide groove so as to drive the ratchet teeth of the upper ratchet wheel to contact with or separate from the guide inclined surface, so that the drainage effect of the auxiliary flow hole is started or closed, wherein the inclined surface of the guide inclined surface and the axial included angle of the drill bit nipple are in a range of 30 degrees and 60 degrees.
2. The bit sub of claim 1 wherein said secondary flowbore is a plurality of circumferentially spaced along said sidewall.
3. The bit sub of claim 2 wherein a portion of the sidewall has a gap with an inner sidewall of the receiving chamber, the secondary flow Kong Kaishe being on the portion.
4. A bit sub according to claim 3, wherein the secondary flow Kong Kaishe is on the top surface of the lower abutment.
5. A bit sub according to claim 3, wherein the guide rib is provided with a drainage channel and the secondary flow Kong Kaishe is at a location where the side wall faces the drainage channel.
6. The bit sub of claim 5 wherein each of said drainage slots is provided with a corresponding one of said auxiliary flow holes.
7. The bit sub of any one of claims 1-6 wherein the lower abutment comprises a lower ratchet engaged with the upper ratchet.
8. The bit sub of any one of claims 1-6, further comprising a sealing mechanism disposed between the upper sub and the lower sub, the sealing mechanism being located below the lower boss.
9. The bit sub of claim 8, wherein the sealing mechanism comprises an annular groove formed in an inner wall of the upper sub or an outer wall of the lower sub, and a sealing ring mounted in the annular groove.
10. The bit sub of any of claims 1-6 wherein the upper sub is fixedly connected to the drill pipe and the lower sub is fixedly connected to the drill bit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710693832.XA CN107386981B (en) | 2017-08-14 | 2017-08-14 | Bit nipple |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710693832.XA CN107386981B (en) | 2017-08-14 | 2017-08-14 | Bit nipple |
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| CN107386981A CN107386981A (en) | 2017-11-24 |
| CN107386981B true CN107386981B (en) | 2023-05-12 |
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| CN109882086B (en) * | 2019-02-28 | 2020-07-21 | 中国石油天然气集团有限公司 | Switching nipple joint of measurement-while-drilling instrument for petroleum drilling |
| CN109882087B (en) * | 2019-02-28 | 2020-06-12 | 中国石油天然气集团有限公司 | Switching nipple joint of logging-while-drilling instrument |
Citations (18)
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