CN209925757U - Double-layer back-dragging head device for directional drill to pass through - Google Patents
Double-layer back-dragging head device for directional drill to pass through Download PDFInfo
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- CN209925757U CN209925757U CN201920153487.5U CN201920153487U CN209925757U CN 209925757 U CN209925757 U CN 209925757U CN 201920153487 U CN201920153487 U CN 201920153487U CN 209925757 U CN209925757 U CN 209925757U
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Abstract
The utility model relates to a double-deck drag head device that returns for directional drilling passes belongs to directional drilling technical field. The heat-insulating layer is wrapped on the outer side of the heat-insulating pipeline, and the PE layer is wrapped on the outer side of the heat-insulating layer; the main pipeline extends out of the heat-insulating layer and is connected with the double-layer back-dragging head device at the pipe end of the directional drilling through the heat-insulating pipeline; the double-layer back-dragging head device comprises a pulling head, a steel sleeve and reinforcing steel bars, the main pipeline extends out of the heat preservation layer and is directly connected with the pulling head, the steel sleeve is sleeved on the outer side of the end of the heat preservation pipeline, one end of the steel sleeve and the PE layer are subjected to heat-shrinkable sleeve waterproof sealing treatment, the other end of the steel sleeve and the main pipeline extending out of the heat preservation layer are subjected to heat-shrinkable sleeve waterproof sealing treatment, and a plurality of reinforcing steel bars are further arranged at the joint of the steel sleeve and the main pipeline. The utility model discloses avoided the heat preservation section atress to drop, but the intensity of make full use of steel casing pipe undertakes back the power of dragging again.
Description
Technical Field
The utility model relates to a double-deck drag head device that returns for directional drilling passes belongs to directional drilling technical field.
Background
In the heavy liquid chemical raw material conveying pipeline engineering, because the conveying medium is the heavy liquid chemical raw material, the condensation point is 80 ℃, the pipeline is prevented from being condensed for reducing heat loss, the whole pipeline is subjected to corrosion prevention and heat preservation, the corrosion prevention and heat preservation structure consists of a corrosion prevention layer, a heat preservation layer and a protective layer from inside to outside, and the directional drilling crossing section is more, so the directional drilling crossing section is considered to be penetrated by the heat preservation pipe. However, due to the fact that the distance of a considerable number of conveying pipeline projects is long, the penetration difficulty of the directional drilling of the heat preservation pipe is large, the construction risk is large, reliable experience is avoided, and compared with the penetration of a common directional drilling, the penetration of the directional drilling of the long-distance heat preservation pipe is mainly added with the heat preservation layer, so that the difficulty is increased, and the method is embodied in the following aspects:
1) the staggered platform at the repaired mouth of the heat preservation pipe is larger than that of the common pipeline, the slab is easy to fall off in the back dragging process, once the slab falls off, the underground water can permeate into the polyurethane heat preservation layer, the heat preservation effect cannot be guaranteed, and the risk that the pipeline is corroded is increased;
2) in the process of pulling back the pipeline, the frictional resistance and the viscous force of the PE layer (the PE layer coated on the polyurethane heat-insulating layer of the heat-insulating pipeline) and the drilled holes are transmitted to the steel pipeline through the polyurethane heat-insulating layer, the bonding strength among the polyurethane heat-insulating layer, the PE layer and the steel pipeline and the self shearing strength are low, the polyurethane heat-insulating layer is easy to fall off, even the drilled holes are blocked, and the crossing failure is caused.
At present, the technical aspect of a unit for the directional drilling and crossing technology of a long-distance heat-preservation pipeline is not mature, and an example is provided for the crossing with small pipe diameter and short distance, but the crossing design is basically designed by a construction scheme provided by a construction unit, the construction technology of the construction unit is not standard, detailed technical measures and technical schemes are not provided, failure cases occur frequently, and even successful cases, the crossing causes heat-preservation layer damage accidents.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that the heat insulation layer is easy to fall off in the process that the directional drill passes through the pipeline back to be dragged, the utility model aims to provide a double-layer back dragging head device for the directional drill to pass through.
The utility model aims at realizing through the following technical scheme:
a double-layer back-dragging head device for directional drilling and crossing is characterized in that a heat insulation layer is wrapped on the outer side of a heat insulation pipeline, and a PE layer is wrapped on the outer side of the heat insulation layer; the main pipeline extends out of the heat-insulating layer and is connected with the double-layer back-dragging head device at the pipe end of the directional drilling through the heat-insulating pipeline; the double-layer back-dragging head device comprises a pulling head, a steel sleeve and reinforcing steel bars, the main pipeline extends out of the heat preservation layer and is directly connected with the pulling head, the steel sleeve is sleeved on the outer side of the end of the heat preservation pipeline, one end of the steel sleeve and the PE layer are subjected to heat-shrinkable sleeve waterproof sealing treatment, the other end of the steel sleeve and the main pipeline extending out of the heat preservation layer are subjected to heat-shrinkable sleeve waterproof sealing treatment, and a plurality of reinforcing steel bars are further arranged at the joint of the steel sleeve and the main pipeline.
Furthermore, a plurality of reinforcement reinforcing steel bars are uniformly arranged along the circumference of the main pipeline, one end of each reinforcement reinforcing steel bar is connected with the end of the steel sleeve, and the other end of each reinforcement reinforcing steel bar is connected to the main pipeline.
Further, the reinforcing steel bars are arranged along a slope angle, and the angle of the slope angle is smaller than 30 degrees.
Further, the main pipeline is connected with the pull head in a welding mode.
Further, the lapping width of the steel sleeve and the PE layer is not less than 250 mm.
The utility model has the advantages that:
1) the possibility of passing through the long-distance heat-insulating pipeline by directional drilling is realized; the risk that the heat-insulating layer is damaged is reduced, and the probability of success of directional drilling and crossing of the heat-insulating pipeline is improved.
2) The back dragging scheme of the heat preservation pipeline adopts a double-layer back dragging head device scheme, and the back dragging head adopts a heat shrinkable sleeve for waterproof sealing treatment; the double-layer back-dragging head avoids the stress falling of the section of the heat-insulating layer, and can fully utilize the strength of the steel sleeve to bear the back-dragging force.
Drawings
FIG. 1 is a cross-sectional view of a dual layer tow back head assembly;
FIG. 2 is a perspective view of a dual layer tow back head assembly;
wherein, 1-a main pipeline, 2-a heat preservation layer, 3-a PE layer, 4-a steel sleeve, 5-a pull head, 6-a heat shrinkage sleeve and 7-a reinforced steel bar,
Detailed Description
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 for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 1-2, in a double-layer back-dragging head device for directional drilling, an insulating layer is wrapped on the outer side of an insulating pipeline, and a PE layer is wrapped on the outer side of the insulating layer; the main pipeline 1 extends out of the heat-insulating layer 2 and is connected with the double-layer back-dragging head device at the pipe end of the directional drilling through the heat-insulating pipeline; the double-layer back-dragging head device comprises a pulling head 5, a steel sleeve 4 and reinforcing steel bars 7, wherein the main pipeline 1 extends out of the heat preservation layer 2 and is directly welded with the pulling head 5, the steel sleeve 4 is sleeved on the outer side of the end of the heat preservation pipeline, one end of the steel sleeve 4 and the PE layer 3 are subjected to waterproof sealing treatment of a heat shrinkage sleeve 6, the other end of the steel sleeve 4 and the main pipeline 1 extending out of the heat preservation layer 2 are subjected to waterproof sealing treatment of the heat shrinkage sleeve 6, and therefore groundwater is prevented from permeating into the polyurethane heat preservation layer. And a plurality of reinforcing steel bars are arranged at the joint of the steel sleeve 4 and the main pipeline 1.
Wherein, a plurality of reinforcement reinforcing bar 7 follows 1 week of trunk line evenly sets up, and the one end of every reinforcement reinforcing bar 7 all with steel casing pipe 4's end connection, the other end is connected on the trunk line 1. And the reinforcing steel bars 7 are obliquely arranged along a slope angle, so that the angle of the slope angle is smaller than 30 degrees in order to avoid overlarge dragging resistance.
The lapping width of the steel sleeve 4 and the PE layer 3 is not less than 250mm, so that the section of the heat-insulating layer is prevented from falling off under stress, and meanwhile, the strength of the steel sleeve can bear part of back-dragging force.
The pipeline design of the pipeline engineering for conveying the heavy liquid chemical raw materials from the Hongkong harbor to the Zibo in the west harbor area of the tobacco station to convey the heavy chemical raw materials of M100 and M180, and the designed conveying capacity is 1500 multiplied by 104t/a. The pipeline passes through 50 large and medium rivers and is penetrated by a directional drill, the maximum diameter of the pipeline passing through the heat-insulating pipeline reaches 864mm, and the longest penetrating distance reaches 1200 m. The invention is applied to a main line and five branch lines of a tobacco harbor western harbor area to Zibo heavy liquid chemical raw material conveying pipeline project, saves the cost of 175.19 ten thousand yuan for the owner unit, and generates the economic effect of 150 ten thousand yuan, which is 325.19 ten thousand yuan in total.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A double-layer back-dragging head device for directional drilling is characterized in that a heat insulation layer is wrapped on the outer side of a heat insulation pipeline, and a PE layer is wrapped on the outer side of the heat insulation layer; the main pipeline (1) extends out of the heat-insulating layer (2) and is connected with the double-layer back-dragging head device at the pipe end of the directional drilling through the heat-insulating pipeline; the double-layer back-dragging head device comprises a pulling head (5), a steel sleeve (4) and reinforcing steel bars (7), the main pipeline (1) stretches out of a heat preservation layer (2) and is directly connected with the pulling head (5), the steel sleeve (4) is sleeved on the outer side of the end of the heat preservation pipeline, one end of the steel sleeve (4) and a PE layer (3) are subjected to waterproof sealing treatment of a heat shrinkable sleeve (6), the other end of the steel sleeve (4) and the main pipeline (1) stretching out of the heat preservation layer (2) are subjected to waterproof sealing treatment of the heat shrinkable sleeve (6), and the joint of the steel sleeve (4) and the main pipeline (1) is further provided with the reinforcing steel bars.
2. The double-layer back-dragging head device for directional drilling through according to claim 1, wherein the plurality of reinforcing steel bars (7) are uniformly arranged along the main pipeline (1) for one circle, one end of each reinforcing steel bar (7) is connected with the end of a steel sleeve (4), and the other end is connected on the main pipeline (1).
3. The double-deck tow back device for directional drilling through according to claim 2, characterized in that the reinforcement rebar (7) is arranged along a slope angle, and the angle of the slope angle is less than 30 degrees.
4. Double-layer return bit device for directional drill-through according to claim 1, characterized in that the main pipe (1) is welded to the slider (5).
5. The double-layer back-dragging head device for directional drilling through according to claim 2, characterized in that the overlap width of the steel sleeve (4) and the PE layer (3) is not less than 250 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920153487.5U CN209925757U (en) | 2019-01-29 | 2019-01-29 | Double-layer back-dragging head device for directional drill to pass through |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920153487.5U CN209925757U (en) | 2019-01-29 | 2019-01-29 | Double-layer back-dragging head device for directional drill to pass through |
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| CN209925757U true CN209925757U (en) | 2020-01-10 |
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| CN201920153487.5U Active CN209925757U (en) | 2019-01-29 | 2019-01-29 | Double-layer back-dragging head device for directional drill to pass through |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271512A (en) * | 2020-03-11 | 2020-06-12 | 支焕 | PE double-layer pipe and processing technology |
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2019
- 2019-01-29 CN CN201920153487.5U patent/CN209925757U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271512A (en) * | 2020-03-11 | 2020-06-12 | 支焕 | PE double-layer pipe and processing technology |
| CN111271512B (en) * | 2020-03-11 | 2021-09-21 | 支焕 | PE double-layer pipe and processing technology |
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