CN214247241U - Flexible drill bit for ultra-short radius horizontal drilling - Google Patents
Flexible drill bit for ultra-short radius horizontal drilling Download PDFInfo
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- CN214247241U CN214247241U CN202023235344.0U CN202023235344U CN214247241U CN 214247241 U CN214247241 U CN 214247241U CN 202023235344 U CN202023235344 U CN 202023235344U CN 214247241 U CN214247241 U CN 214247241U
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Abstract
The utility model discloses a flexible drill bit is used in super short radius horizontal drilling, including the drill bit body, wherein: a drill bit spline groove is formed in the inner cavity of the upper connecting rod of the drill bit body, and the drill bit connecting sleeve and the drill bit rotating sleeve are connected to two ends of the upper connecting rod body of the drill bit body. The utility model provides a current drill bit and the flexible drilling rod problem that does not form a complete set, can form ultrashort radius horizontal drilling flexible drilling tool with the supporting use of flexible drilling rod, convenient equipment has enlarged the range of application of flexible drilling tool, has improved the efficiency of construction of well drilling, has reduced manufacturing cost, has apparent result of use and can produce apparent economic benefits and social.
Description
Technical Field
The utility model relates to a drill bit of oil industry's ultrashort radius horizontal drilling, in particular to flexible drill bit is used in ultrashort radius horizontal drilling.
Background
At present, most old oil fields in China enter the middle and later stages of development, the pressure coefficient of a main force block is lower and lower, the exploitation economy is poorer and poorer by adopting the traditional drilling mode, and the ultra-short radius side drilling technology for simultaneously exploiting a plurality of layer series in the same well is one of the production increasing means with higher economy in the current oil exploitation.
According to the difference of the curvature radius of the well hole, the radial horizontal well is divided into a long radius well, a middle radius well, a short radius well and an ultra-short radius well. And the horizontal well with the curvature radius smaller than 6m is an ultra-short radius horizontal well. Wells with shorter radii of curvature are more difficult to drill and require more drilling tools.
In the prior art, the ultra-short radius drilling process mainly comprises two main categories of high-pressure hose water jet drilling and flexible guide drilling tool rotary drilling.
A company has a technology for breaking rock and drilling by using high-pressure rotary jet, and the technology has the following problems: the horizontal well formed by the jet flow jet rock breaking has small borehole diameter and irregular pore passage, and the advancing track of the hydraulic jet drill bit is uncontrollable due to the hose, the formed borehole track is irregular, the borehole track cannot be measured, the applicable well completion technology is lacked, the sand production reservoir cannot prevent sand, the borehole is easy to collapse and close due to no support, and the yield is reduced rapidly.
Based on the jet injection principle, the Chinese invention patent ZL2009200123400 discloses a high-pressure water jet injection combination tool which comprises an injection main body and a well completion accessory, wherein the injection main body comprises a nozzle, a high-pressure pipe and the like, and a slotted flexible sieve pipe. The slotted flexible screen pipe is sleeved on the outer side of the high-pressure pipe, the drilling tool is lifted after the injection footage reaches the designed well depth, and the slotted flexible screen pipe and the sand control screen are both kept in a well hole formed by injection, so that well completion is realized. The drilling and completion method has the following problems: the slots of the slotted flexible sieve tube are perpendicular to the drilling direction of a well hole and are not regular circular arcs, so that the slots are often scraped with the well wall in a large area in the process of going into the well, and the whole set of combined tool cannot advance smoothly.
The Chinese patent technologies related to the drilling method of the guide type ultra-short radius horizontal well comprise the following steps: ZL2015104510629, ZL 201146271, ZL2017109462512 and ZL2017105827546, the drilling principles of which are substantially similar. Firstly, setting the whipstock, adopting magnetic positioning to calibrate the depth when setting the whipstock, determining the normal direction of the inclined plane of the whipstock by a gyroscope to enable the normal direction to be the same as the designed azimuth angle of a borehole, windowing by adopting a conventional windowing method after setting the whipstock, and drilling by adopting a guide drilling tool at an inclined section. The guide drilling tool comprises a guide cylinder and a flexible drill rod, wherein the guide cylinder is of a human elbow joint simulating structure and can only be bent in a certain semi-radial direction with fixed curvature at one side to restrict the flexible drill rod inside to carry out deflecting drilling. When the guide drilling tool is put in, the bending direction of the guide cylinder is adjusted by the gyroscope to be consistent with the normal direction of the inclined plane of the whipstock, and the ultra-short radius deflecting drilling direction is ensured to be the same as the design direction of the well hole. When the deflecting drilling is implemented, the upper part of the guide cylinder is connected with the outer cylinder of the power drilling tool and does not rotate, the lower part of the guide cylinder is matched with the drill bit through a bearing, and the drill bit is pressurized through a conventional drill rod on the upper part of the power drilling tool and is applied with drilling pressure by the guide cylinder. The flexible drill rod inside is of an imitated universal transmission shaft structure, the flexible drill rod is hollow inside and connected in series, torque can be transmitted, the upper portion of the flexible drill rod string is connected with a power drilling tool mandrel, the lower portion of the flexible drill rod string is connected with a drill bit, and the flexible drill rod string is mainly used for transmitting torque to the drill bit and providing a drilling fluid circulation channel. The guide drilling tool set is mainly used for drilling construction of an ultra-short radius deflecting well section, the guide drilling tool is lifted out after the deflecting section is finished and reaches a target layer, a horizontal drilling tool is put into the horizontal drilling tool, the horizontal drilling tool mainly comprises a drill bit, a flexible drill rod and a conventional drilling tool from bottom to top, power is usually provided by a ground turntable for avoiding the supporting and pressing phenomenon of the horizontal well section, the power can also be provided by an underground power drilling tool, and the drilling tool is lifted out after the horizontal well is drilled into a well to complete well. The technology can finish the deflecting section with the curvature radius of 3-5m, quickly enter a target layer with 90-degree well deflection, can horizontally drill 50-100 m, and basically can meet the technological requirements of ultra-short radius horizontal drilling. The following problems still remain:
1. current drill bit is mostly the REG drilling rod pin of standard, few part is REG drilling rod box, the well size because of ultrashort radius horizontal drilling is little, flexible drilling rod receives size and flexible bending structure restriction, can not design into the REG drilling rod of standard with the connector link type of drill bit and detain, must supporting dedicated crossover sub just can be connected with the drill bit and form flexible drilling tool combination, not only the equipment drilling tool is complicated, and the crossover sub that increases has increased nearly drill bit drilling tool combination's rigid length by a wide margin, be difficult to form and through 3 ~ 5m radius of curvature's well.
2. Taking 139.7mm casing windowing sidetrack drilling as an example, the existing drill bit for ultra-short radius horizontal drilling is limited by a size structure, only can be connected by adopting a small-sized REG non-standard drill rod buckle, meanwhile, the small-sized drill rod buckle also plays a role in transmitting torque, through finite element analysis and indoor experimental research, the designed small-sized REG non-standard drill rod buckle has the torsional strength of only 5000-6000 N.m, when a follow-up rotary disc is matched with a horizontal section to perform drilling, along with well bore extension, the friction resistance of a drilling tool is continuously increased, the peak torque output by a ground rotary disc often exceeds 10000N.m, the torsional strength of the small-sized REG non-standard drill rod buckle exceeds the torsional strength of the small-sized REG non-standard drill rod buckle, downhole accidents of drilling tool fracture often occur during field construction, the construction difficulty, the construction cost and the period are greatly increased, and meanwhile, because the small-sized REG non-standard drill rod buckle has low torsional strength, the extension capability of a horizontal well bore is severely limited.
Therefore, in order to enable the flexible drilling tool assembly to smoothly drill a well with a curvature radius of 3-5m and improve the extension capability of a horizontal well with an ultra-short radius, a flexible drill bit needs to be designed to form the horizontal drilling tool assembly with the ultra-short radius together with a flexible drill rod, so that the bottleneck of the prior art is overcome, the application field of the horizontal well technology with the ultra-short radius is enlarged, and the development effects of cost reduction and efficiency improvement are achieved.
Disclosure of Invention
To the problem that current drill bit and flexible drilling rod are not supporting, the utility model aims at providing a flexible drill bit is used in ultrashort radius horizontal drilling forms ultrashort radius horizontal drilling flexible drilling tool with the supporting use of flexible drilling rod, and convenient equipment can enlarge the range of application of flexible drilling tool, does benefit to and forms 3-5m curvature radius well, improves the extension ability of ultrashort radius horizontal well. The construction efficiency of well drilling is improved, and the production cost is reduced.
The technical solution of the utility model is that:
a flexible drill bit for ultra-short radius horizontal drilling comprising a bit body, wherein:
a drill bit spline groove is formed in the inner cavity of the upper connecting rod of the drill bit body;
the drill bit connecting sleeve and the drill bit rotating sleeve are connected to two ends of the upper connecting rod body of the drill bit body.
The drill bit spline groove of the drill bit body can be connected with a drill rod connecting spline shaft of a flexible drill rod in the ultra-short radius horizontal drilling flexible drilling tool.
The drill bit spline groove of the drill bit body can be connected with a stabilizer spline shaft of a flexible drill column horizontal drilling stabilizer in the flexible drill tool for ultra-short radius horizontal drilling.
And a sealing cavity is arranged below the drill bit spline groove in the drill bit body, the inner diameter of the sealing cavity is consistent with the outer diameter of the drill rod connecting section below the drill rod connecting spline shaft in the flexible drill rod, and the drill rod connecting section provided with a drill rod sealing element in the flexible drill rod can be inserted into the sealing cavity.
Below the bit spline grooves in the bit body is a sealed cavity having an inner diameter that conforms to the outer diameter of the bit connection section below the stabilizer spline shaft of the flexible drill string horizontal drilling stabilizer and into which the bit connection section with the bit seal in the flexible drill string horizontal drilling stabilizer can be inserted.
The drill bit connecting sleeve is a non-equal-diameter inner cavity, and inner threads are arranged at two ends of the inner cavity.
The internal thread in the inner cavity of the upper part of the drill bit connecting sleeve can be in threaded connection with the drill rod threaded connecting section of the drill rod torque transmission shaft in the flexible drill rod; the lower inner cavity of the drill bit connecting sleeve is in threaded connection with the outer circle of the upper part of the drill bit rotating sleeve.
The internal thread in the inner cavity of the upper part of the drill bit connecting sleeve can be in threaded connection with the drill bit threaded connecting section of the stabilizer torsion transmission shaft in the flexible drill string horizontal drilling stabilizer; the lower inner cavity of the drill bit connecting sleeve is in threaded connection with the outer circle of the upper part of the drill bit rotating sleeve.
And the middle inner cavity of the drill bit connecting sleeve is in clearance fit with the upper connecting rod body of the drill bit body.
Compared with the prior drill bit, the beneficial effects of the utility model are that:
1. the utility model provides a flexible drill bit adopts spline to pass and turns round coupling mechanism, and it is more convenient to be connected with flexible drill rod, and the nearly drill bit combination rigidity of formation is little, is favorable to forming 3-5m radius of curvature well.
2. The utility model provides a flexible drill bit adopts spline to pass and turns round coupling mechanism, can with flexible drilling string level between flexible drilling rod and the flexible drill bit in the flexible drilling tool of ultrashort radius horizontal drilling be crept into the stabilizer and be connected, torsional strength is big, the extending ability of well is stronger, the security of creeping into in the pit is high, more is favorable to forming 3-5m radius of curvature well.
3. The utility model discloses an on-spot strong adaptability is owing to the construction is simple, drilling efficiency is effectively improved, and is popularized and applied on a large scale more easily.
4. The utility model provides a current drill bit and the flexible drilling rod problem that does not form a complete set, can form ultrashort radius horizontal drilling flexible drilling tool with the supporting use of flexible drilling rod, convenient equipment has enlarged the range of application of flexible drilling tool, has improved the efficiency of construction of well drilling, has reduced manufacturing cost, has apparent result of use and can produce apparent economic benefits and social.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic view of the working principle and the overall structure of a flexible drill string with the present invention installed.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is a schematic view of the structure in the direction of a-a in fig. 2.
In the figure: the device comprises an original well casing 1, a conventional drill rod 2, a conversion joint 3, a flexible drill rod 4, a whipstock 5, a deflecting section 6, a flexible drill string horizontal drilling stabilizer 7, a flexible drill bit 8, a drill bit connecting sleeve 8.1, a drill bit spline groove 8.2, a drill bit body 8.3, a drill bit rotating sleeve 8.4 and a horizontal section 9.
Detailed Description
The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present disclosure. The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In addition, in the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1 and 2, a flexible drill bit for ultra-short radius horizontal drilling comprises a bit body 8.3, wherein:
a drill bit spline groove 8.2 is arranged in the inner cavity of the upper connecting rod of the drill bit body 8.3;
the drill bit connecting sleeve 8.1 and the drill bit rotating sleeve 8.4 are connected at two ends of the upper connecting rod body of the drill bit body 8.3. The utility model discloses can be connected through flexible drilling rod 4 in the direct and ultrashort radius horizontal drilling flexible drilling tool of drill bit spline groove 8.2, also can be connected through flexible drilling column horizontal drilling stabilizer 7 in drill bit spline groove 8.2 and the ultrashort radius horizontal drilling flexible drilling tool, be favorable to forming 3-5 m's curvature radius well.
The drill bit spline groove 8.2 of the drill bit body 8.3 can be connected with a drill rod connecting spline shaft of the flexible drill rod 4 in the ultra-short radius horizontal drilling flexible drilling tool. The drill bit spline groove 8.2 of the drill bit body 8.3 is connected with the flexible drill rod 4 in the flexible drill tool for the ultra-short radius horizontal drilling to form a spline connection torque transmission mechanism, the connection with the flexible drill rod 4 is more convenient, the rigidity of the formed near drill bit combination is small, and a 3-5m curvature radius well hole is convenient to form.
The drill bit spline groove 8.2 of the drill bit body 8.3 can be connected with a stabilizer spline shaft of a flexible drill string horizontal drilling stabilizer 7 in the flexible drilling tool for ultra-short radius horizontal drilling. After the flexible drill string horizontal drilling stabilizer 7 is connected between the flexible drill rod 4 and the flexible drill bit 8 in the flexible drill tool for ultra-short radius horizontal drilling, the drill bit spline groove 8.2 of the drill bit body 8.3 is connected with the stabilizer spline shaft of the flexible drill string horizontal drilling stabilizer 7 to form a spline connection torque transmission mechanism, so that the flexible drill bit 8 for ultra-short radius horizontal drilling can be more favorably drilled, the connection between the two is more convenient, the formed near-drill bit combination has small rigidity, and a 3-5m curvature radius well hole can be more favorably formed.
The below of drill bit spline groove 8.2 is the seal chamber among the drill bit body 8.3, and the internal diameter of this seal chamber accords with and can insert the drilling rod linkage segment that is equipped with the drilling rod sealing member in the flexible drilling rod 4 in this seal chamber with the external diameter of the drilling rod linkage segment of drilling rod connection spline shaft below in the flexible drilling rod 4, realizes the utility model discloses and the sealing between the flexible drilling rod 4.
The below of drill bit spline groove 8.2 is the seal chamber among the drill bit body 8.3, and the internal diameter of this seal chamber and the flexible drill string level creep into the external diameter of the drill bit linkage segment of stabilizer spline shaft below of stabilizer 7 and accord and can insert the drill bit linkage segment that the flexible drill string level was equipped with the drill bit sealing member in the stabilizer 7 in this seal chamber, realize the utility model discloses with the flexible drill string level creep into the sealed between the stabilizer 7.
The drill bit connecting sleeve 8.1 is a non-equal-diameter inner cavity, and inner threads are arranged at two ends of the inner cavity.
The internal thread in the inner cavity at the upper part of the drill bit connecting sleeve 8.1 can be in threaded connection with the drill rod threaded connecting section of the drill rod torsion transmission shaft in the flexible drill rod 4; the lower inner cavity of the drill bit connecting sleeve 8.1 is in threaded connection with the upper excircle of the drill bit rotating sleeve 8.4.
The internal thread in the inner cavity of the upper part of the drill bit connecting sleeve 8.1 can be in threaded connection with the drill bit threaded connecting section of the stabilizer torsion transmission shaft in the flexible drill string horizontal drilling stabilizer 7; the lower inner cavity of the drill bit connecting sleeve 8.1 is in threaded connection with the upper excircle of the drill bit rotating sleeve 8.4.
And the middle inner cavity of the drill bit connecting sleeve 8.1 is in clearance fit with the upper connecting rod body of the drill bit body 8.3.
The construction method of the flexible drilling tool well drilling by using the flexible drill bit 8 for ultra-short radius horizontal well drilling comprises the following steps:
A. firstly, a whipstock 5 is put into and set in a casing 1 of an original shaft; after the whipstock 5 reaches the design depth, the normal direction of the inclined plane of the whipstock 5 is adjusted through the gyroscope to be consistent with the design direction of the ultra-short radius borehole orbit, and the whipstock 5 is set after the gyroscope is lifted out.
B. Milling the casing 1 by using a windowing milling cone to form an upper window and a lower window, and starting a windowing drilling tool;
C. running ultra-short radius horizontal drilling tool, drilling the deflecting section 6 and forming the borehole with 3-5m curvature radius. The ultra-short radius horizontal drilling tool is mainly formed by connecting a flexible drill bit 8 for ultra-short radius horizontal drilling, a flexible drill column horizontal drilling stabilizer 7, a flexible drill column formed by connecting flexible drill rods 4 in series, a conversion joint 3 and a conventional drill rod 2 from bottom to top. The upper part of the flexible drill string is connected to the conventional drill pipe 2 via a crossover joint 3 and is connected through the conventional drill pipe 2 to the kelly or to the power drill.
When the ultra-short radius horizontal drilling tool reaches the upper window and the lower window, the tool is slowly lowered under the pressure lower than 20kN, the flexible drill bit 8 for ultra-short radius horizontal drilling is made to touch the inclined surface of the whipstock 5, the bit pressure is lightly added under the pressure of 10 kN-30 kN, and the inclined surface of the whipstock 5 applies lateral reaction force to the flexible drill bit 8 for ultra-short radius horizontal drilling, wherein the lateral reaction force is the same as the design direction of the ultra-short radius well track. The stabilizer coupling shaft in the flexible drill string horizontal drilling stabilizer 7 connected with the flexible drill bit 8 for ultra-short radius horizontal drilling is forced to bend laterally, and the bending direction is towards the design orientation of the ultra-short radius well track. Meanwhile, torque output by a power drilling tool above a ground turntable or the conventional drill rod 2 is transmitted to the flexible drill rods 4 through the conventional drill rod 2, torque is transmitted downwards between the flexible drill rods 4 through a spline pair formed by the drill rod connecting spline shaft and the drill rod connecting spline groove, and is finally transmitted to the flexible drill bit 8 for ultra-short radius horizontal drilling, rotary rock breaking drilling is carried out, and the deflecting section 6 is drilled out at first, and then the horizontal section 9 is drilled out.
The embodiments described above are merely exemplary embodiments, but the present invention is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and teaching of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and modifications can be made, and equivalents can be substituted for elements thereof. Any modification, equivalent replacement, improvement and the like made within the spirit and the concept of the present invention should be included in the protection scope of the present invention. The scope of protection is therefore not limited to the description above.
Claims (9)
1. The utility model provides an ultra-short radius flexible drill bit for horizontal drilling, includes the drill bit body, characterized by, wherein:
a drill bit spline groove is formed in the inner cavity of the upper connecting rod of the drill bit body;
the drill bit connecting sleeve and the drill bit rotating sleeve are connected to two ends of the upper connecting rod body of the drill bit body.
2. The flexible drill bit for ultra-short radius horizontal drilling as recited in claim 1, wherein said bit body spline grooves are adapted to be connected to a drill rod connecting spline of a flexible drill rod of the flexible drill string for ultra-short radius horizontal drilling.
3. The flexible drill bit for ultra-short radius horizontal drilling as recited in claim 1, wherein said bit body bit spline grooves are adapted to engage with stabilizer spline shafts of flexible drill string horizontal drilling stabilizers of the flexible ultra-short radius horizontal drilling tool.
4. A flexible drill bit for ultra-short radius horizontal drilling as defined in claim 1 or 2 wherein below the bit spline grooves in the bit body is a seal cavity having an inner diameter corresponding to the outer diameter of the drill rod coupling section below the drill rod coupling spline shaft in the flexible drill rod and into which the drill rod coupling section with the drill rod seal mounted therein can be inserted.
5. A flexible drill bit for ultra-short radius horizontal drilling as defined in claim 1 or 3 wherein below the bit spline grooves in the bit body is a seal cavity having an inner diameter corresponding to the outer diameter of the bit shank below the stabilizer spline of the flexible drill string horizontal drilling stabilizer and into which the bit shank with the bit seal mounted therein can be inserted.
6. The flexible drill bit for ultra-short radius horizontal drilling as recited in claim 1, wherein said drill bit coupling sleeve is a non-constant diameter cavity and has internal threads at both ends of the cavity.
7. The flexible drill bit for ultra-short radius horizontal drilling as claimed in claim 2 or 6, wherein the internal thread in the inner cavity of the upper part of the drill bit connecting sleeve can be in threaded connection with the drill rod threaded connecting section of the drill rod torque transmission shaft in the flexible drill rod; the lower inner cavity of the drill bit connecting sleeve is in threaded connection with the outer circle of the upper part of the drill bit rotating sleeve.
8. The flexible drill bit for ultra-short radius horizontal drilling as claimed in claim 3 or 6, wherein the internal thread in the inner cavity of the upper part of the drill bit connecting sleeve can be in threaded connection with the drill bit threaded connecting section of the stabilizer torsion transmission shaft in the flexible drill string horizontal drilling stabilizer; the lower inner cavity of the drill bit connecting sleeve is in threaded connection with the outer circle of the upper part of the drill bit rotating sleeve.
9. The flexible drill bit for ultra-short radius horizontal drilling as claimed in claim 6, wherein the middle cavity of the drill bit connecting sleeve is in clearance fit with the upper connecting rod body of the drill bit body.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023235344.0U CN214247241U (en) | 2020-12-29 | 2020-12-29 | Flexible drill bit for ultra-short radius horizontal drilling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023235344.0U CN214247241U (en) | 2020-12-29 | 2020-12-29 | Flexible drill bit for ultra-short radius horizontal drilling |
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| CN214247241U true CN214247241U (en) | 2021-09-21 |
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| CN202023235344.0U Active CN214247241U (en) | 2020-12-29 | 2020-12-29 | Flexible drill bit for ultra-short radius horizontal drilling |
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