CN216811592U - Novel heat insulation drill rod - Google Patents
Novel heat insulation drill rod Download PDFInfo
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- CN216811592U CN216811592U CN202122379853.9U CN202122379853U CN216811592U CN 216811592 U CN216811592 U CN 216811592U CN 202122379853 U CN202122379853 U CN 202122379853U CN 216811592 U CN216811592 U CN 216811592U
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Abstract
A novel heat insulation drill rod comprises an upper joint, a joint lining, a heat insulation material, an outer pipe body, an inner pipe body and a lower joint. Through the interference fit of the outer pipe body lug and the inner pipe body groove and the interference fit of the joint lug and the lining groove, the heat insulation drill rod is reasonable and compact in structure, and the overall strength is improved; the included angles and the heights of the two side surfaces of the convex blocks on the joint and the pipe body are consistent, and a filling gap of a heat insulation material is formed after the convex blocks are matched with the grooves, so that the processing technology of the heat insulation drill pipe is simplified, and the manufacturing cost is reduced; the heat insulation material is an alumina-silica aerogel heat insulation composite material, and the overall heat conductivity coefficient of the drill rod is effectively reduced. The novel heat insulation drill rod integrally provides a good heat insulation effect for the drilling fluid in a high-temperature environment, the problem that an underground motor, an electronic instrument and a drilling tool are difficult to normally work or short in service life in the high-temperature environment is effectively solved, the safety of drilling operation is improved, and the drilling cost is reduced.
Description
Technical Field
The utility model relates to the technical field of petroleum drilling, in particular to a novel heat-insulating drill rod.
Background
With the continuous progress of oil exploration and development, the main strategic target has been shifted to exploiting oil and gas reservoirs with high difficulty and deep burial, so that the conventional downhole drilling tool has been difficult to meet increasingly demanding drilling operation requirements. Due to the existence of the geothermal gradient, the bottom temperature of a deep well and an ultra-deep well continuously rises along with the increase of the depth of the well, so that the temperature of drilling fluid is easily and rapidly increased, the chip carrying capacity of a drill rod is reduced, the service life of a drill bit and other downhole tools is shortened, and the condition that downhole motors, electronic instruments, guiding tools and the like cannot be used is caused.
For example, the utility model patent CN202011038749.7 discloses a heat insulation drill rod for cooling a high temperature well bore and a preparation method thereof, which mainly comprises a heat insulation layer, a drill rod pipe body, a heat insulation coating, an external thread joint and an internal thread joint, wherein the drill rod pipe body is hollow and cylindrical, a circular ring-shaped heat insulation layer concentric with the drill rod pipe body is arranged inside the pipe wall of the drill rod pipe body, a heat insulation coating is arranged on the outer wall of the drill rod pipe body, the heat insulation layer takes phenolic resin as a raw material, closed-cell particles and the phenolic resin are sintered at high temperature and then injected into the annular space inside the drill rod, and are fully combined with the drill rod after cooling forming, a compact heat insulation layer with a certain thickness is formed on the inner wall of the drill rod, which can effectively reduce the overall heat conductivity coefficient of the drill rod, but the heat insulation drill rod needs to process a circular annular space concentric with the drill rod pipe body inside the pipe body, the processing technology is complex, and the manufacturing cost is increased, and the connecting part of the inner wall and the outer wall of the pipe body and the injection channel are weak links of the drill rod, a sealing device is lacked, and the overall strength is to be improved. The utility model patent CN201910257687.X designs a drill rod with a heat preservation function, a spraying device and a spraying method thereof, mainly comprising a hollow rod body, a bottom coating, a heat preservation layer and a protection layer, wherein the bottom coating is uniformly coated on the inner wall of the hollow rod body, the heat preservation layer is uniformly coated on the bottom coating, the protection layer is coated on the edges of two ends of the heat preservation layer, and the thickness is gradually reduced from the heat-insulating layer to the inner wall of the hollow rod body, the base coat is phenolic aldehyde primer, ester glue primer, nitro primer or alkyd primer, the heat-insulating material is one or the combination of more of hollow ceramic micro-beads, hollow glass micro-beads, asbestos powder, mica powder and fumed silica, the heat insulation effect on the drilling fluid can be improved, but the coating of the drill rod is exposed on the inner wall of the hollow rod body, the drilling fluid can directly scour the coating, and the possibility of damage is high, so that the heat insulation time limit of the drill rod needs to be further optimized. The drill rod with heat preservation capability is characterized in that a heat preservation layer is added on the inner wall of the drill rod consisting of metal and surface anti-corrosion paint, a material with the average heat conductivity coefficient not more than 0.12W/(m.K) at the temperature of no more than 350 ℃ is selected as a heat preservation material, the performance requirements of the heat preservation layer on high vibration resistance, scouring resistance, corrosion resistance and the like under the conditions of high temperature and high pressure are considered, and the temperature of the drilling fluid can be effectively reduced by adopting the modern high-temperature epoxy resin spraying process and the like. However, the erosion resistance of the heat-insulating layer of the drill rod is gradually reduced under the conditions of high temperature and high pressure and complex vibration and under the continuous action of solid particles such as weighting agents in drilling fluid, and meanwhile, the heat-insulating layer has higher requirements on corresponding spraying processes, and a spraying device capable of realizing the performance needs to be further provided, so that the service life of the heat-insulating drill rod is shorter, and common manufacturers cannot meet corresponding processing requirements easily. A journal published in the natural gas technology and economy article of research and application of thermal insulation technology of an oil pipe of a water producing gas well relates to an underground thermal insulation oil pipe which mainly comprises an inner pipe, an outer pipe, a thermal insulation medium and a thermal insulation lining, the sealing washer, constitute such as coupling, the thermal-insulated medium between the interior outer tube mainly includes argon gas, glass fiber or other insulation material, it cleans in order to keep good heat-proof quality for a long time to fill the getter in the sealed annular space, the inner tube of two adjacent heat preservation oil pipe tube joints passes through thermal-insulated bush intercommunication, the erection end and the link of thermal-insulated bush are the toper structure, the erection end cartridge utilizes the high strength adhesive bonding in the inner tube, the both ends of inner tube are equipped with the flaring structure and pass through flaring structure fixed connection on the inner wall of outer tube, the toper structure cartridge of bush is fixed in the flaring structure, can guarantee the sufficient joint strength of oil pipe and heat-proof quality. However, the heat-insulating oil pipe is fixed on the inner wall of the outer pipe through flaring structures at two ends of the inner pipe and welded, when the heat-insulating oil pipe is applied to a drill rod with complex underground stress conditions, the inner pipe with a small welding area is easy to fall off and is not beneficial to underground safe operation, and the inner pipe and the outer pipe are welded and sealed after being filled with gas, so that the heat-insulating oil pipe is high in processing and manufacturing difficulty and not beneficial to mass production.
SUMMERY OF THE UTILITY MODEL
The utility model provides a novel heat insulation drill rod, which is reasonable and compact in structure and improves the overall strength through the interference fit of a lug of an outer pipe body and a groove of an inner pipe body and the interference fit of a lug of a joint and a groove of an inner lining; the included angles and the heights of the two side surfaces of the convex blocks on the joint and the pipe body are consistent, and a filling gap of a heat insulation material is formed after the convex blocks are matched with the grooves, so that the processing technology of the heat insulation drill pipe is simplified, and the manufacturing cost is reduced; the drilling fluid heat-insulating material provides a good heat-insulating effect for the drilling fluid in a high-temperature environment, effectively solves the problems that an underground motor, an electronic instrument and a drilling tool are difficult to work normally or have short service life in the high-temperature environment, improves the safety of drilling operation, and effectively reduces the drilling cost.
The technical scheme of the utility model is as follows:
a novel insulated drill pipe, comprising:
the inner hole of the outer pipe body comprises a middle hole section, a first positioning hole section and a second positioning hole section, wherein the first positioning hole section and the second positioning hole section are symmetrically arranged at two ends of the middle hole section; the first positioning hole section and the second positioning hole section are uniformly provided with a plurality of outer pipe body grooves along the circumferential direction, the outer pipe body grooves axially extend from the end surface of the outer pipe body to the middle hole section, and outer pipe body convex blocks are formed between adjacent outer pipe body grooves;
the inner pipe body is arranged in the inner hole of the outer pipe body and corresponds to the inner hole of the outer pipe body, and the outer surface of the inner pipe body comprises a first positioning shaft section, a middle shaft section and a second positioning shaft section; a plurality of inner pipe body grooves are uniformly formed in the outer surfaces of the first positioning shaft section and the second positioning shaft section along the circumferential direction corresponding to the outer pipe body convex blocks, the inner pipe body grooves axially extend from the end surface of the inner pipe body to the middle shaft section, and inner pipe body convex blocks are formed between adjacent inner pipe body grooves; the outer diameter of the middle shaft section is equal to the outer diameter of the groove bottom of the inner pipe body groove, and the first positioning shaft section and the second positioning shaft section are connected with the middle shaft section through conical transition shaft sections; the inner pipe body groove and the outer pipe body lug are in interference fit;
the upper joint and the lower joint are respectively arranged at two ends of the outer pipe body and the assembly body of the inner pipe body, the upper joint and the lower joint respectively comprise a third positioning hole section, a plurality of joint grooves are uniformly arranged on the third positioning hole section along the circumferential direction, the joint grooves axially penetrate through two end faces of the third positioning hole section, and joint convex blocks are formed between adjacent joint grooves;
the joint lining is arranged in an inner hole of the third positioning hole section, the outer surface of the joint lining comprises a main positioning shaft section and an auxiliary positioning shaft section, the outer diameter of the auxiliary positioning shaft section is smaller than that of the main positioning shaft section and corresponds to the joint lug, a plurality of lining grooves are uniformly formed in the outer surfaces of the main positioning shaft section and the auxiliary positioning shaft section along the circumferential direction, the lining grooves axially penetrate through two end surfaces of the joint lining, and the lining lug is formed between every two adjacent lining grooves; the lining groove and the joint lug are in interference fit;
and the heat insulation materials are filled in gaps between the outer pipe body and the inner pipe body and between the upper joint, the lower joint and the joint lining.
Preferably, in each positioning hole section, 4 lugs are uniformly distributed along the circumferential direction, and the included angle between two side surfaces of each lug is 35-45 degrees; and/or the radial heights of the outer pipe body lug, the joint lug and the lining lug of the main positioning shaft section are 10-12 mm; the radial height of the lining lug of the auxiliary positioning shaft section is 6-8 mm.
Preferably, the joint groove is communicated with the joint inner hole through a transition arc surface; the curvature radius R of the transition arc surface is 20-25 mm.
Preferably, the connecting conical threaded hole section of the upper joint is connected with the third positioning hole section through a conical hole transition section and a cylindrical hole section, the inner diameters of which are sequentially reduced; and the outer surface of the lower joint is provided with an outer conical thread matched with the connecting conical threaded hole of the connecting conical threaded hole section.
Preferably, an arc shoulder is arranged between the lining lug of the main positioning shaft section and the lining lug of the auxiliary positioning shaft section, the axial length of the lining lug of the main positioning shaft section is 60-80 mm, and the axial length of the lining lug of the auxiliary positioning shaft section is 140-160 mm.
Preferably, the novel heat insulation drill rod further comprises a heat insulation coating which is uniformly sprayed on the outer walls of the upper joint, the outer pipe body and the lower joint.
Preferably, the heat insulation coating is an organic silicon high-temperature resistant heat insulation coating; the thickness of the organic silicon high-temperature-resistant heat-insulating coating is 1-1.5 mm.
Preferably, the axial length of the outer pipe body projection is 160-180 mm, the axial length of the inner pipe body groove is 180-200 mm, and the slopes of the conical transition hole section and the conical transition shaft section are both 25-35 °.
Preferably, the heat insulation material is an alumina-silica aerogel heat insulation composite material.
Preferably, the upper joint and the lower joint filled with the heat insulating material are integrally connected with the assembly body of the outer pipe body and the inner pipe body by friction butt welding.
Compared with the prior art, the utility model has the advantages that:
1. according to the novel heat insulation drill rod, the outer pipe body lugs uniformly distributed in the circumferential direction on the inner wall of the outer pipe body are in interference fit with the inner pipe body grooves of the inner pipe body, and the joint lugs uniformly distributed in the circumferential direction on the inner walls of the upper joint and the lower joint are in interference fit with the lining grooves of the joint lining, so that the heat insulation drill rod is reasonable and compact in structure, and the overall strength is improved;
2. according to the novel heat insulation drill rod, the joint and the convex blocks with the same included angle and height on the two side surfaces of the pipe body are matched with the grooves to form a filling gap of a high-temperature-resistant heat insulation material, so that the processing technology of the heat insulation drill rod is simplified, and the manufacturing cost is reduced;
3. according to the novel heat-insulating drill rod, the alumina-silica aerogel heat-insulating composite material with high temperature resistance and good mechanical property is selected as the heat-insulating material, the overall heat conductivity coefficient of the drill rod is effectively reduced, and the organic silicon high-temperature-resistant heat-insulating coating with good scouring resistance, high temperature resistance and heat-insulating effect is uniformly sprayed on the outer walls of the upper end connector, the outer pipe body and the lower end connector, so that the heat-insulating property of the drill rod is further enhanced, and the bottom hole temperature reduction effect is improved.
4. The novel heat insulation drill rod provided by the utility model provides a better heat insulation effect for drilling fluid in the drill rod in a high-temperature environment, effectively solves the problems that an underground motor, an electronic instrument and a drilling tool are difficult to work normally in the high-temperature environment or the service life is short, is favorable for improving the safety of drilling operation, reduces the drilling cost and has a wide engineering application value.
Drawings
FIG. 1 is a schematic cross-sectional view of one embodiment of the novel insulated drill pipe of the present invention;
FIG. 2 is a schematic three-dimensional structure of the novel insulated upper joint of the drill pipe according to the present invention;
FIG. 3 is a schematic cross-sectional view of the upper joint of the novel insulated drill pipe according to the present invention;
FIG. 4 is a schematic end view of the novel upper joint of the insulated drill pipe according to the present invention;
FIG. 5 is a schematic three-dimensional view of the novel insulated drill pipe joint liner of the present invention;
FIG. 6 is a schematic cross-sectional view of the novel insulated drill pipe joint liner of the present invention;
FIG. 7 is a schematic three-dimensional structure of the novel insulated drill pipe lower joint according to the present invention;
FIG. 8 is a schematic cross-sectional view of the inner tube of the novel insulated drill pipe of the present invention;
FIG. 9 is a schematic cross-sectional view of the outer pipe body of the novel insulated drill pipe of the present invention.
The reference numbers in the figures are:
1-upper joint, 11-connecting taper thread hole section, 12-taper hole transition section, 13-cylindrical hole section, 14-third positioning hole section, 141-joint projection, 142-joint groove, 143-transition arc surface, 2-joint lining, 21-main positioning shaft section, 22-auxiliary positioning shaft section, 23-lining groove, 211-lining projection of main positioning shaft section, 221-lining projection of auxiliary positioning shaft section, 24-arc shoulder, 25-joint inner hole, 3-heat insulation material, 4-outer pipe body, 41-first positioning hole section, 42-middle hole section, 43-second positioning hole section, 44-taper transition hole section, 45-outer pipe body groove, 46-outer pipe body projection, 5-heat insulation coating, 6-inner pipe body, 61-a first positioning shaft section, 62-a middle shaft section, 63-a second positioning shaft section, 64-an inner pipe body groove, 65-an inner pipe body bump, 66-a conical transition shaft section; 7-lower joint, 71-external taper screw shaft.
Detailed Description
To facilitate an understanding of the utility model, the utility model is described in more detail below with reference to figures 1-4 and the specific examples.
A novel heat insulation drill rod is shown in figures 1-9 and comprises an upper joint 1, a joint lining 2, a heat insulation material 3, an outer pipe body 4, a heat insulation coating 5, an inner pipe body 6 and a lower joint 7.
As shown in fig. 1-4, the upper joint 1 is disposed at the upper end of the outer tube 4 and the assembly body of the inner tube 6, the upper joint 1 includes, from top to bottom, a tapered threaded hole section, a tapered hole transition section 12, a cylindrical hole section 13, and a third positioning hole section 14, 4 joint protrusions 141 are uniformly distributed on the inner wall of the third positioning hole section 14 along the circumferential direction, the included angle between the two side surfaces of the joint protrusions 141 is 35 ° to 45 °, and the height h is a height h110-12 mm, a joint groove 142 is formed between two adjacent joint convex blocks 141, a transition arc surface 143 is arranged at the upper end of the joint groove 142, and the curvature radius R of the transition arc surface 143 is 20-25 mm.
Preferably, as shown in fig. 1, 5 and 6, the joint lining 2 is placed in the inner hole of the third positioning hole section 14, the outer wall of the joint lining 2 comprises a main positioning shaft section 21 and an auxiliary positioning shaft section 22, the outer diameter of the auxiliary positioning shaft section 22 is smaller than the outer diameter of the main positioning shaft section 21, 4 lining lugs (211,221) are uniformly distributed on the outer surfaces of the main positioning shaft section 21 and the auxiliary positioning shaft section 22 along the circumferential direction, and two adjacent lining lugs (211, 2)21) Form inside lining recess 23 between, inside lining recess 23 link up along the axial two terminal surfaces that connect inside lining 2, adopt circular arc shoulder 24 transition between main location shaft section 21 and the vice location shaft section 22, the both sides face contained angle and the height of the inside lining lug 211 of main location shaft section 21 all with connect lug 141 unanimously, just the axial length L of the inside lining lug 211 of main location shaft section 21160-80 mm, the height h of the lining lug 221 of the auxiliary positioning shaft section 2226-8 mm, axial length L2140 ~ 160mm, inside lining recess 23 with adopt interference fit's mode to realize connecting inside lining 2 between the joint lug 141 and be in the circumference of the third locating hole section 14 of top connection 1 is fixed.
As shown in fig. 1 and 7, the lower joint 7 has the same structure as part of the upper joint 1, and also includes a cylindrical hole section of a conical hole transition section and a third positioning hole section, except that the threaded connection section is an external conical threaded shaft 71, and the external conical threaded shaft 71 is provided with external conical threads matched with the connection conical threaded hole of the connection conical threaded hole section 11.
As shown in fig. 1 and 9, the outer tube body sequentially includes a first positioning hole section 41, a middle hole section 42 and a second positioning hole section 43 from top to bottom, and the first positioning hole section 41 and the second positioning hole section 43 are symmetrically disposed at two ends of the middle hole section 42. The hole diameter of the inner hole of the first positioning hole section 41 and the hole diameter of the inner hole of the second positioning hole section 43 are both smaller than the hole diameter of the inner hole of the middle hole section 42.
The inner walls of the first positioning hole section 41 and the second positioning hole section 43 are uniformly distributed with 4 outer body lugs 46 along the circumferential direction, an outer body groove 45 is formed between every two adjacent outer body lugs 46, and the outer body groove 45 extends to the middle hole section 42 from the end face of the outer body 4 along the axial direction. The included angles and heights of the two side surfaces of the outer pipe body convex block 46 are consistent with those of the joint convex block 141, and the axial length L of the outer pipe body convex block 463160-180 mm, and a conical transition hole section 44 is arranged at the joint of the conical transition hole section and the middle hole section 42, and the transition bevel angle alpha of the guide bevel of the conical transition hole section 44 is 25-35 degrees.
As shown in fig. 1 and 8, the inner tube 6 is disposed in the inner bore of the outer tube 4 corresponding to the inner boreAn inner bore of the outer tube body 4, an outer surface of the inner tube body 6 comprising a first positioning shaft section 61, a middle shaft section 62 and a second positioning shaft section 63; the outer walls of the first positioning shaft section 61 and the second positioning shaft section 63 are uniformly distributed with 4 inner pipe body protrusions 65 along the circumferential direction, an inner pipe body groove 64 is formed between two adjacent inner pipe body protrusions 65, the inner pipe body groove 64 extends to the middle shaft section 62 from the end surface of the inner pipe body 6 along the axial direction, and the axial length L of the inner pipe body groove 644The diameter of the middle shaft section 62 is 180-200 mm, the outer diameter of the middle shaft section 62 is equal to the outer diameter of the groove bottom of the inner pipe body groove 64, a conical transition shaft section 66 is arranged at the joint of the inner pipe body groove 64 and the middle shaft section 62, and the lead bevel angle beta of the lead bevel of the conical transition shaft section 66 is 25-35 degrees. The inner tube groove 64 and the outer tube projection 46 are in interference fit to circumferentially fix the inner tube.
The heat insulation materials 3 are filled in gaps between the outer pipe body and the inner pipe body and between the upper joint 1, the lower joint 7 and the joint lining 2, and the heat insulation materials 3 are alumina-silica aerogel heat insulation composite materials. The heat insulation coating 5 is an organic silicon high-temperature-resistant coating, and is uniformly sprayed on the outer walls of the upper joint 1, the outer pipe body 4 and the lower joint 7 of the assembled novel heat insulation drill rod, and the spraying thickness is preferably 1-1.5 mm.
Preferably, the upper joint 1 and the lower joint 3 are respectively assembled with the joint lining 2 and then connected with the assembly body of the outer pipe body 4 and the inner pipe body 6 by friction butt welding.
Preferably, the maximum outer diameter of the upper joint 1 and the maximum outer diameter of the lower joint 3 are preferably 200-204 mm, the outer diameter of the outer pipe body 4 is preferably 170-174 mm, the inner diameter is preferably 150-154 mm, and the inner hole diameter of the inner pipe body 6 and the inner hole 25 of the joint lining 2 are preferably 115-118 mm.
It should be noted that the above-described embodiments may enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way. Therefore, although the present invention has been described in detail with reference to the drawings and examples, it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the utility model.
Claims (10)
1. A novel heat insulation drill rod is characterized by comprising:
the inner hole of the outer pipe body comprises a middle hole section, a first positioning hole section and a second positioning hole section, wherein the first positioning hole section and the second positioning hole section are symmetrically arranged at two ends of the middle hole section; the first positioning hole section and the second positioning hole section are uniformly provided with a plurality of outer pipe body grooves along the circumferential direction, the outer pipe body grooves axially extend from the end surface of the outer pipe body to the middle hole section, and outer pipe body convex blocks are formed between adjacent outer pipe body grooves;
the inner pipe body is arranged in the inner hole of the outer pipe body and corresponds to the inner hole of the outer pipe body, and the outer surface of the inner pipe body comprises a first positioning shaft section, a middle shaft section and a second positioning shaft section; a plurality of inner pipe body grooves are uniformly formed in the outer surfaces of the first positioning shaft section and the second positioning shaft section along the circumferential direction corresponding to the outer pipe body convex blocks, the inner pipe body grooves axially extend from the end surface of the inner pipe body to the middle shaft section, and inner pipe body convex blocks are formed between adjacent inner pipe body grooves; the outer diameter of the middle shaft section is equal to the outer diameter of the groove bottom of the inner pipe body groove, and the first positioning shaft section and the second positioning shaft section are connected with the middle shaft section through conical transition shaft sections; the inner pipe body groove and the outer pipe body lug are in interference fit;
the upper joint and the lower joint are respectively arranged at two ends of the outer pipe body and the assembly body of the inner pipe body, the upper joint and the lower joint respectively comprise a third positioning hole section, a plurality of joint grooves are uniformly formed in the third positioning hole section along the circumferential direction, the joint grooves axially penetrate through two end surfaces of the third positioning hole section, and joint convex blocks are formed between adjacent joint grooves;
the joint lining is arranged in an inner hole of the third positioning hole section, the outer surface of the joint lining comprises a main positioning shaft section and an auxiliary positioning shaft section, the outer diameter of the auxiliary positioning shaft section is smaller than that of the main positioning shaft section and corresponds to the joint lug, a plurality of lining grooves are uniformly formed in the outer surfaces of the main positioning shaft section and the auxiliary positioning shaft section along the circumferential direction, the lining grooves axially penetrate through two end surfaces of the joint lining, and the lining lug is formed between every two adjacent lining grooves; the lining groove and the joint lug are in interference fit;
and the heat insulation materials are filled in gaps between the outer pipe body and the inner pipe body and between the upper joint, the lower joint and the joint lining.
2. The novel heat insulation drill rod as claimed in claim 1, wherein 4 projections are uniformly distributed on each positioning hole section along the circumferential direction, and the included angle between two side surfaces of each projection is 35-45 degrees; and/or the radial heights of the outer pipe body lug, the joint lug and the lining lug of the main positioning shaft section are 10-12 mm; the radial height of the lining lug of the auxiliary positioning shaft section is 6-8 mm.
3. The novel heat insulation drill rod as claimed in claim 2, characterized in that the joint groove is communicated with the joint inner hole through a transition arc surface; the curvature radius R of the transition arc surface is 20-25 mm.
4. The novel heat insulation drill rod as claimed in claim 1, wherein the connecting conical threaded hole section of the upper joint is connected with the third positioning hole section through a conical hole transition section and a cylindrical hole section with successively reduced inner diameters; and the outer surface of the lower joint is provided with an outer conical thread matched with the connecting conical threaded hole of the connecting conical threaded hole section.
5. The novel heat insulation drill rod as claimed in claim 1, wherein an arc shoulder is arranged between the lining lug of the main positioning shaft section and the lining lug of the auxiliary positioning shaft section, the axial length of the lining lug of the main positioning shaft section is 60-80 mm, and the axial length of the lining lug of the auxiliary positioning shaft section is 140-160 mm.
6. The novel heat-insulating drill rod as claimed in claim 1, further comprising a heat-insulating coating uniformly sprayed on the outer walls of the upper joint, the outer pipe body and the lower joint.
7. The novel insulated drill pipe of claim 6, wherein the thermal barrier coating is a silicone high temperature resistant thermal barrier coating; the thickness of the organic silicon high-temperature-resistant heat-insulating coating is 1-1.5 mm.
8. The novel insulated drill rod of claim 1, wherein the axial length of the outer body projection is 160-180 mm, the axial length of the inner body groove is 180-200 mm, and the slopes of the conical transition hole section and the conical transition shaft section are both 25-35 °.
9. The novel insulated drill pipe of claim 1, wherein the insulating material is an alumina-silica aerogel insulation composite.
10. The novel insulated drill pipe of claim 9, wherein the upper and lower joints filled with the thermal insulation material are integrally connected with the assembly of the outer and inner pipes, respectively, by friction butt welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122379853.9U CN216811592U (en) | 2021-09-29 | 2021-09-29 | Novel heat insulation drill rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122379853.9U CN216811592U (en) | 2021-09-29 | 2021-09-29 | Novel heat insulation drill rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216811592U true CN216811592U (en) | 2022-06-24 |
Family
ID=82040198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122379853.9U Active CN216811592U (en) | 2021-09-29 | 2021-09-29 | Novel heat insulation drill rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216811592U (en) |
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2021
- 2021-09-29 CN CN202122379853.9U patent/CN216811592U/en active Active
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