CN211974883U - Large cutting head of double-speed double-center drilling speed-increasing equipment for increasing drilling speed of oil and gas well - Google Patents
Large cutting head of double-speed double-center drilling speed-increasing equipment for increasing drilling speed of oil and gas well Download PDFInfo
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- CN211974883U CN211974883U CN202020411645.5U CN202020411645U CN211974883U CN 211974883 U CN211974883 U CN 211974883U CN 202020411645 U CN202020411645 U CN 202020411645U CN 211974883 U CN211974883 U CN 211974883U
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Abstract
The utility model provides a big cutting head of double speed double-heart well drilling speed-up equipment of improvement oil gas well drilling speed, big cutting head includes holding connecting portion and hollow cutting portion that fixed connection each other along first central line, wherein, the cutting portion has the outer wall that is provided with the external tangent plane and the inner wall that is provided with a plurality of internal tangent planes, form the runner groove between arbitrary two adjacent internal tangent planes in a plurality of internal tangent planes; the receiving coupling has a coupling and an internal volume disposed along a first centerline capable of receiving a small cutting head disposed along a second centerline parallel to but not coincident with the first centerline, the small cutting head having an outer diameter less than an outer diameter of the cutting portion. The utility model discloses carried out optimal design to the structure of big cutting head, realized utilizing big cutting head and little cutting head eccentric settings to mutually support and creep into, drill bit central point linear velocity is zero's problem when having avoided the well drilling, has improved drilling speed.
Description
Technical Field
The utility model belongs to oil and gas drilling engineering field relates to a big cutting head of double speed two heart well drilling speed-up equipment that improves oil gas well drilling speed.
Background
In the oil and gas well drilling engineering, how to improve the drilling speed is an important subject of research, and although the drilling speed is improved to a certain extent by optimally designing the structure of the drill bit and developing new drill bit tooth materials, teeth with higher performance and the like, the problems that the linear speed of the central point of the drill bit is zero and the linear speed near the central point is low to influence the drilling speed during drilling are still not solved. This effect is particularly evident in PDC bits, which are currently in large use. In addition, the bit that is pulled out of service is not difficult to find, and this problem is a key problem affecting the speed increase of the well.
The inventor considers that the double-speed double-center drilling technology is beneficial to solving the problem that the linear velocity of the central point of the drill bit is zero through research, so that the drilling speed can be further improved. However, the inventors showed that: in order to better match the "two-speed, double-center" drilling technique proposed by the inventor, the structure of the large cutting head needs to be redesigned to solve the problem of discharging drilling fluid and drill cuttings generated by the small cutting head during the drilling process.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve at least one of the above-mentioned not enough of prior art existence.
Specifically, the inventors have studied to propose: the problem that the linear velocity of the central part of the drill bit is zero can be solved by adopting double-speed and double-center drilling equipment. For the two-speed, dual-core drilling apparatus and technique proposed by the inventors, by providing a large cutting head (also referred to as a large drill bit, equivalent to the outer core) having a first centerline, a receiving coupling portion and a hollow cutting portion fixedly coupled to each other along the first centerline; and a small cutting head (also referred to as a small drill, equivalent to an inner core) having a second centerline; and the receiving coupling has a coupling member and an internal volume disposed along a first centerline, the internal volume being capable of receiving a small cutting head, the second centerline being parallel to but not coincident with the first centerline to achieve "bi-centering". At the same time, the large cutting head receives a first power for rotary drilling through the upper drill string and is provided with lubrication by drilling fluid from the upper drill string; the small cutting head obtains a second power for rotary drilling by means of the downhole power means, which here corresponds to the small cutting head "spinning" around said second centre line, and the upper drill string is also able to drive the downhole power means and thus the small cutting head into rotation, which corresponds to the small cutting head "revolving" around the first centre line.
The inventors showed that: in order to better implement the dual-speed dual-core drilling equipment with the structure, and solve the problem of chip removal of the rock debris generated by the small cutting head, the structure of the large cutting head needs to be redesigned.
In order to accomplish the above objects, the present invention provides a large cutting head of a dual-speed, bi-center drilling acceleration apparatus for increasing a drilling speed of an oil and gas well, the large cutting head including a receiving coupling portion and a hollow cutting portion fixedly coupled to each other along a first center line, wherein the cutting portion has an outer wall provided with an outer cutting surface and an inner wall provided with a plurality of inner cutting surfaces, a flow channel groove being formed between any two adjacent inner cutting surfaces among the plurality of inner cutting surfaces; the receiving coupling has a coupling and an internal volume disposed along a first centerline capable of receiving a small cutting head disposed along a second centerline parallel to but not coincident with the first centerline, the small cutting head having an outer diameter less than an outer diameter of the cutting portion.
In an exemplary embodiment of the present invention, the inner wall of the connecting member may have an inner diameter gradually decreasing from left to right.
In an exemplary embodiment of the present invention, the outer wall of the cutting part may be drill-bit-shaped.
In an exemplary embodiment of the present invention, the inner volume chamber may communicate with the runner groove.
In an exemplary embodiment of the present invention, the number of the inner cutting surfaces and the runner grooves may be 3 to 8.
In an exemplary embodiment of the present invention, the top surface of the inner cutting surface near the first centerline may be a concave arc shape.
In an exemplary embodiment of the present invention, the number of the outer cutting surfaces may be 3 to 8.
In an exemplary embodiment of the present invention, the inner cutting plane may be symmetrically disposed about the first central line.
Compared with the prior art, the utility model discloses at least one of following beneficial effect has:
(1) redesigning the structure of the large cutting head, and adding an inner volume cavity for placing the small cutting head and a runner groove for discharging drilling fluid and rock debris generated by the small cutting head;
(2) the easy-cutting core columnar rock can be formed by using a large cutting head; cutting the columnar rock with the center part by using a small cutting head;
(3) the mutual matching advantages of the large cutting head and the small cutting head are complementary, the problem that the linear velocity of the central point of the drill bit is zero is avoided, and the rock breaking efficiency is improved.
Drawings
Figure 1 shows a schematic structural view of a large cutting head of a two-speed dual-center drilling acceleration device for increasing the drilling speed of an oil and gas well according to the present invention;
fig. 2 shows a right side view of fig. 1.
The reference numerals are explained below:
1-connecting piece, 2-inner volume cavity, 3-cutting part, 301-external cutting surface, 302-internal cutting surface and 303-runner groove.
Detailed Description
Hereinafter, the large cutting head of the two-speed dual-center drilling speed-up device for increasing the drilling speed of oil and gas wells according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments. It should be noted that "left", "right", "inner", "outer", and the like are merely for convenience of description and constituting relative orientations or positional relationships, and do not indicate or imply that the components referred to must have the specific orientations or positions.
Figure 1 shows a schematic structural view of a large cutting head of a two-speed dual-center drilling acceleration device for increasing the drilling speed of an oil and gas well according to the present invention; fig. 2 shows a right side view of fig. 1.
In an exemplary embodiment of the present invention, as shown in fig. 1, a large cutting head of a two-speed, bi-center drilling acceleration apparatus for increasing the drilling speed of an oil and gas well includes a receiving coupling portion and a hollow cutting portion 3 fixedly coupled to each other along a first centerline. In particular, the large cutting head may comprise a coupling member 1, an inner volume 2 and a cutting portion 3 fixedly connected in sequence from left to right. Wherein the coupling 1 connects a large cutting head with upstream equipment (e.g. an upper drill string, an outer cylinder connected to the upper drill string, a centralizer, etc.), the inner volume 2 in which a small cutting head rotates in a direction parallel to the first centre line, and the cutting portion 3 for cutting the face to be drilled. The connecting piece 1 and the inner volume 2 together constitute a receiving connection.
In the present exemplary embodiment, as shown in fig. 1 to 2, the cutting portion 3 has an outer wall provided with an outer cutting face 301 and an inner wall provided with a plurality of inner cutting faces 302, and a flow channel groove 303 is formed between any two adjacent inner cutting faces 302 of the plurality of inner cutting faces 302. Specifically, the outer wall and the inner wall of the cutting part 3 of the large cutting head can be respectively provided with an external cutting surface 301 and an internal cutting surface 302 for cutting a rock face to be drilled, a borehole (namely, an annular borehole) with a columnar core in the middle is formed on the rock face to be drilled through the combined action of the external cutting surface 301 and the internal cutting surface 302, the columnar core enters the inner volume cavity 2 of the large cutting head through the hollow cutting part 3 to be in contact with the small cutting head, and the small cutting head cuts the core into rock debris. The flow channel groove 303 formed between two adjacent inner cutting surfaces 302 is used for discharging drilling fluid (e.g., from an upper drill pipe, a small cutting head, etc.) inside the large cutting head and debris formed by the small cutting head cutting the columnar core out of the large cutting head. Here, the outer wall of the cutting part 3 may be drill-shaped. For example, the outer cutting surfaces 301 may be cones, cutting teeth, etc., which are progressively spaced from the first centerline from left to right and are helically disposed. Here, the number of the inner cutting faces 302 and the runner grooves 303 may be 3 to 8. For example, the number of the inner cutting faces and the runner grooves may be 5. The number of the external cutting surfaces 301 is 3-8. For example, the number of external cutting faces may be 5.
In the present exemplary embodiment, the receiving coupling has a coupling 1 and an inner volume 2 arranged along a first centre line, the inner volume 2 being capable of receiving a small cutting head arranged along a second centre line, parallel to but not coinciding with the first centre line, the small cutting head having an outer diameter smaller than the outer diameter of said cutting portion 3. Specifically, the receiving coupling portion of the large cutting head includes a coupling member 1 for coupling with an upstream equipment and an inner volume 2 for receiving the small cutting head, the inner volume 2 being disposed along a first centerline (i.e., in a left-right direction in fig. 1), the inner volume 2 being capable of accommodating therein the small cutting head disposed along a second centerline (i.e., a centerline of the small cutting head) for rotation therein with the large cutting head and the small cutting head being disposed in parallel but not in alignment, the small cutting head having an outer diameter smaller than an outer diameter of the cutting portion 3 of the large cutting head so that the small cutting head and the large cutting head are disposed eccentrically. The inner wall of the connecting member 1 may have an inner diameter gradually decreasing from left to right. For example, the coupling 1 may be a cylindrical structure with threads on the inner wall, and the large cutting head is fixedly connected to the upstream equipment by the threads of the coupling 1. However, the utility model is not limited to this, the connecting piece can also be through modes such as joint and upstream equipment fixed connection. Here, the inner diameter of the inner volume 2 remains constant from left to right and is larger than the outer diameter of the small cutting head; the inner volume chamber 2 may communicate with the runner groove 303. The cuttings generated by cutting the columnar core by the small cutting head can be discharged out of the large cutting head through the runner groove along with drilling fluid.
In the present exemplary embodiment, a top surface of the inner cutting surface 302 near the first centerline may be a concave arc shape (e.g., a circular arc shape). The inner cutting face 302 may be symmetrically disposed about the first centerline. Here, the inner cutting surfaces 302 are symmetrically arranged around the first center line in order to facilitate better drainage of drilling fluid and debris generated by the small cutting head cutting the columnar core out of the inner volume 2 of the large cutting head. However, the present invention is not limited thereto, and for example, the inner cutting surface may be spirally disposed from left to right around the first center line.
When drilling, the large cutting head is directly or indirectly connected with the upper drill string, so that the drill pressure and the torque are large, the cutting part 3 of the large cutting head is firstly contacted with the surface to be drilled to destroy the rock surface, the formation pressure is released, the peripheral rocks are cut off to form an annular borehole, and a columnar core with the center relatively easy to cut is left. The columnar core enters the inner volume cavity 2 from the hollow structure of the cutting part 3 to be in contact with the small cutting head, the small cutting head revolves around the central line of the large cutting head at the same time of high-speed rotation under the driving of the underground power device, so that the high rotating speed and linear cutting speed are achieved, the columnar core cutting head can be cut into rock debris, the rock debris is discharged out of the large cutting head from the runner groove 303 of the large cutting head along with drilling fluid in an upper drill rod, the problem that the linear speed of the central point of a drill bit is zero due to the mutual matching of the large cutting head and the small cutting head can be avoided, and the drilling.
To sum up, the utility model discloses a righting device of double speed two heart well drilling speed-raising equipment has following advantage:
(1) redesigning the structure of the large cutting head, and adding an inner volume cavity for placing the small cutting head and a runner groove for discharging drilling fluid and rock debris generated by the small cutting head;
(2) the characteristics of large drilling pressure and large torque of a large cutting head can be utilized firstly, the stratum rock is subjected to early destruction, the stratum stress is released, the peripheral rock is cut off, and the core rock which is easy to cut is left; cutting the core rock by using the characteristics of high rotating speed and high linear speed of the small cutting head;
(3) the mutual matching advantages of the large cutting head and the small cutting head are complementary, the problem that the linear velocity of the central point of the drill bit is zero is avoided, and the rock breaking efficiency is improved.
Although the present invention has been described above in connection with exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.
Claims (8)
1. A large cutting head for a two-speed, dual-center drilling acceleration apparatus for increasing the drilling speed of oil and gas wells, the large cutting head comprising a receiving coupling portion and a hollow cutting portion fixedly coupled to each other along a first centerline, wherein,
the cutting part is provided with an outer wall provided with an external cutting surface and an inner wall provided with a plurality of internal cutting surfaces, and a runner groove is formed between any two adjacent internal cutting surfaces in the plurality of internal cutting surfaces;
the receiving coupling has a coupling and an internal volume disposed along a first centerline capable of receiving a small cutting head disposed along a second centerline parallel to but not coincident with the first centerline, the small cutting head having an outer diameter less than an outer diameter of the cutting portion.
2. The large cutting head of a two speed, dual center drilling acceleration apparatus for increasing the drilling speed of oil and gas wells as claimed in claim 1, wherein the inner wall of the coupling has an inner diameter that gradually decreases from left to right.
3. The large cutting head of a two speed, dual center drilling acceleration apparatus for increasing the drilling speed of oil and gas wells as claimed in claim 1, wherein the outer wall of the cutting portion is drill-bit shaped.
4. The large cutting head for a two speed, dual center drilling acceleration apparatus for increasing the drilling speed of oil and gas wells as in claim 1, wherein the inner volume chamber is in communication with the flow channel slot.
5. The large cutting head of a double-speed double-center drilling speed-up device for improving the drilling speed of an oil and gas well as claimed in claim 1, wherein the number of the inner cutting faces and the flow channel grooves is 3-8.
6. The large cutting head for a two speed, dual center drilling acceleration apparatus for increasing the drilling speed of oil and gas wells as in claim 1, wherein the top surface of the inner cutting surface adjacent to the first centerline is concavely curved.
7. The large cutting head of the double-speed double-center drilling speed-up equipment for improving the drilling speed of the oil-gas well as claimed in claim 1, wherein the number of the external cutting surfaces is 3-8.
8. The large cutting head of a two speed, dual center drilling acceleration apparatus for increasing the drilling speed of oil and gas wells as in claim 1, wherein the inner cutting surfaces are symmetrically disposed about the first centerline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020411645.5U CN211974883U (en) | 2020-03-26 | 2020-03-26 | Large cutting head of double-speed double-center drilling speed-increasing equipment for increasing drilling speed of oil and gas well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020411645.5U CN211974883U (en) | 2020-03-26 | 2020-03-26 | Large cutting head of double-speed double-center drilling speed-increasing equipment for increasing drilling speed of oil and gas well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211974883U true CN211974883U (en) | 2020-11-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020411645.5U Active CN211974883U (en) | 2020-03-26 | 2020-03-26 | Large cutting head of double-speed double-center drilling speed-increasing equipment for increasing drilling speed of oil and gas well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211974883U (en) |
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2020
- 2020-03-26 CN CN202020411645.5U patent/CN211974883U/en active Active
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