CN114077012A - Splicing structure and method for splicing optical cable in movable electric igniter capable of measuring temperature - Google Patents
Splicing structure and method for splicing optical cable in movable electric igniter capable of measuring temperature Download PDFInfo
- Publication number
- CN114077012A CN114077012A CN202010841054.6A CN202010841054A CN114077012A CN 114077012 A CN114077012 A CN 114077012A CN 202010841054 A CN202010841054 A CN 202010841054A CN 114077012 A CN114077012 A CN 114077012A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- splicing
- power supply
- reserved
- insulating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000013307 optical fiber Substances 0.000 claims abstract description 237
- 239000011241 protective layer Substances 0.000 claims abstract description 87
- 238000005485 electric heating Methods 0.000 claims abstract description 64
- 210000001503 joint Anatomy 0.000 claims abstract description 35
- 239000010410 layer Substances 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims description 57
- 230000001681 protective effect Effects 0.000 claims description 57
- 238000004804 winding Methods 0.000 claims description 13
- 238000003466 welding Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 10
- 238000009413 insulation Methods 0.000 description 16
- 239000003921 oil Substances 0.000 description 15
- 239000011247 coating layer Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000002390 adhesive tape Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2558—Reinforcement of splice joint
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
Abstract
The invention relates to a splicing structure and a method for a temperature-measurable mobile electric igniter internal cross-connection optical cable, wherein the structure comprises a first splicing protective layer which is insulated and coated on the outer side of the butt joint part of an electric heating section reserved optical fiber and a power supply cable reserved optical fiber, the outer side of the first splicing protective layer is radially sleeved with second splicing protective layers at intervals, the second splicing protective layer can be insulated and coated on the outer sides of an electric heating section reserved optical fiber armor and a power supply cable reserved optical fiber armor, and the outer side of the second splicing protective layer is insulated and sleeved with a third splicing protective layer. The invention overcomes the problems in the prior art, adopts three splicing protective layers to carry out splicing protection on the optical cable of the electric igniter, and carries out layer-by-layer protection from inside to outside, thereby improving the safety of butt joint and ensuring that the electric igniter realizes the ignition monitoring integrated function.
Description
Technical Field
The invention relates to the technical field of petroleum logging, in particular to a splicing structure and a splicing method of a temperature-measurable mobile electric igniter internal cross-connection optical cable.
Background
The fire flooding is used as a key replacing technology for the later stage of heavy oil thermal recovery, a large-scale field experiment stage is entered at present, fire flooding high-temperature ignition and dynamic regulation are the keys for determining whether the fire flooding is successful, the key problems of unclear ignition state, lack of basis for gas injection parameter adjustment, lack of reference in an electric ignition heating process, unclear longitudinal gas suction profile and the like exist in the existing fire flooding development well, and how to realize effective monitoring of the ignition process becomes the key for determining whether the fire flooding is successful. Aiming at the difficult problem of fireflood monitoring, two monitoring technologies, namely an ultra-high temperature thermocouple and an ultra-high temperature distributed optical fiber, have been successfully developed, but are limited by an electric ignition pipe column and a testing process, the two monitoring technologies can only bind a monitoring system outside an oil pipe into a well to monitor an ignition well, a central channel of the oil pipe is reserved for an electric heater to heat, the technology is only suitable for a general ignition well with a casing pipe of more than 7 inches at present, and the technology cannot effectively monitor a half-casing well with a casing pipe of 5 inches and a layered ignition well. Therefore, a movable electric igniter integrating temperature measurement is developed, after an electric heating section of the movable electric igniter and a cable are manufactured respectively, optical fibers penetrating and connected in the electric heating section need to be spliced with optical fibers prefabricated in the cable and protected, and the splicing position is located at the cold end of the movable electric igniter and needs to be protected by high-temperature resistant materials; meanwhile, the prefabricated optical fiber outer armor in the cable is contacted with one power supply core of the cable, the optical fiber outer armor is conductive, and the optical fiber outer armor of the electric heating section is connected with a continuous oil pipe for external protection of the electric heater, so that the optical fiber outer armor needs to be protected by adopting an insulating material; the splicing point is also the splicing position of the electric heating section and the cable, certain strength needs to be ensured for splicing under the condition of small diameter, the optical fiber is prevented from being broken or extruded, and protection of a special structure needs to be considered for the purpose.
Therefore, the inventor provides a splicing structure and a method for a temperature-measurable mobile electric igniter internal cross-connection optical cable by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.
Disclosure of Invention
The invention aims to provide a splicing structure and a splicing method of a cross-connection optical cable in a movable electric igniter capable of measuring temperature, which overcome the problems in the prior art, and adopt three splicing protective layers to carry out splicing protection on the optical cable of the electric igniter, and the three splicing protective layers carry out layer-by-layer protection from inside to outside, thereby improving the safety of butt joint and ensuring that the electric igniter realizes an ignition monitoring integrated function.
The invention aims to realize the splicing structure of the splicing optical cable in the mobile electric igniter capable of measuring temperature, which comprises a first splicing protective layer which is insulated and coated on the outer side of the butt joint part of an electric heating section reserved optical fiber and a power supply cable reserved optical fiber, wherein a second splicing protective layer is radially sleeved on the outer side of the first splicing protective layer at intervals, the second splicing protective layer can be insulated and coated on the outer sides of an electric heating section reserved optical fiber outer armor and a power supply cable reserved optical fiber outer armor, and a third splicing protective layer is insulated and sleeved on the outer side of the second splicing protective layer.
In a preferred embodiment of the present invention, the first splicing protection layer includes a first insulating protection tube, an inner diameter of the first insulating protection tube is larger than outer diameters of the electrical heating section reserved optical fiber and the power supply cable reserved optical fiber, a first inner ring space is formed between an inner wall of the first insulating protection tube and an outer wall of the electrical heating section reserved optical fiber, a second inner ring space is formed between the inner wall of the first insulating protection tube and the outer wall of the power supply cable reserved optical fiber, and the first inner ring space and the second inner ring space are filled with the high temperature resistant bonding unit.
In a preferred embodiment of the present invention, the second splicing protecting layer includes a second insulating protecting tube, two ends of the second insulating protecting tube respectively and tightly abut against the outer sheath of the reserved optical fiber of the electrical heating section and the outer sheath of the reserved optical fiber of the power supply cable, and two ends of the second insulating protecting tube are respectively provided with an insulating positioning sleeve.
In a preferred embodiment of the present invention, the positioning sleeve is an insulating sleeve formed by winding an insulating tape.
In a preferred embodiment of the invention, the third splicing protection layer comprises an intertwining layer formed by winding a high-temperature-resistant insulating tape, and the intertwining layer is wrapped outside the second insulating protection pipe and the positioning sleeve in an insulating intertwining mode.
In a preferred embodiment of the present invention, the optical fiber cable further includes a first optical fiber protection tube and a second optical fiber protection tube, the first optical fiber protection tube is inserted between the electrical heating section reserved optical fiber and the electrical heating section reserved optical fiber outer sheath, the second optical fiber protection tube is inserted between the power supply cable reserved optical fiber and the power supply cable reserved optical fiber outer sheath, and the first optical fiber protection tube and the second optical fiber protection tube are arranged in an insulating manner.
In a preferred embodiment of the present invention, the first optical fiber protective tube and the second optical fiber protective tube are high temperature resistant protective tubes, and the heat resistant temperature is up to 300 ℃.
In a preferred embodiment of the present invention, the first insulating protection tube has a tube diameter of 0.25mm and a heat-resistant temperature of at most 300 ℃.
In a preferred embodiment of the present invention, the second insulating protection tube has a tube diameter of 5mm and a heat-resistant temperature of up to 300 ℃.
The invention can also realize the purpose, a splicing method of the cross-under optical cable in the mobile electric igniter capable of measuring the temperature, the adjacent ends of the reserved optical fiber of the electric heating section and the reserved optical fiber of the power supply cable are welded to form a butt joint part, and the outer side of the butt joint part is coated with the first splicing protective layer of the splicing structure of the cross-under optical cable in the mobile electric igniter capable of measuring the temperature; the second splicing protective layer of the splicing structure of the splicing optical cable in the movable electric igniter capable of measuring temperature is sleeved on the reserved optical fiber outer armor of the power supply cable and the reserved optical fiber outer armor of the electric heating section at the outer side of the first splicing protective layer; and the third splicing protective layer of the splicing structure of the cross-connecting optical cable in the mobile electric igniter capable of measuring the temperature is wound outside the second splicing protective layer.
In a preferred embodiment of the present invention, a method for splicing a cross-over optical cable in a mobile electric igniter capable of measuring temperature comprises the following steps:
step a, preprocessing an electrical heating section reserved optical fiber and a power supply cable reserved optical fiber, enabling the electrical heating section reserved optical fiber to protrude and expose out of an electrical heating section reserved optical fiber outer armor, and enabling the power supply cable reserved optical fiber to protrude and expose out of a power supply cable reserved optical fiber outer armor;
b, sleeving a second insulating protective pipe on the outer armor of the reserved optical fiber of the electric heating section or the outer armor of the reserved optical fiber of the power supply cable;
step c, sleeving the first insulating protective pipe on the outer side of the reserved optical fiber of the electric heating section or the reserved optical fiber of the power supply cable;
d, welding adjacent ends of the electrical heating section reserved optical fiber and the power supply cable reserved optical fiber to form a butt joint part, coating a high-temperature-resistant bonding unit on the outer side of the butt joint part, moving and rotating the first insulating protective pipe to enable the high-temperature-resistant bonding unit to be uniformly distributed, and curing and bonding the first insulating protective pipe at high temperature to complete a first splicing protective layer;
e, moving the second insulating protective tube to enable two ends of the second insulating protective tube to respectively abut against and be sleeved on the reserved optical fiber outer armor of the electric heating section and the reserved optical fiber outer armor of the power supply cable in a sealing mode, and winding insulating tapes on two ends of the second insulating protective tube to form insulating sleeves to complete a second splicing protective layer;
f, winding a high-temperature-resistant insulating tape from one end of the second continuous connection protective layer to the other end of the second continuous connection protective layer to finish the third continuous connection protective layer;
and g, conducting the electric conduction core of the electric heating section with the electric conduction core of the power supply cable, welding the continuous oil pipe outside the power supply cable with the continuous oil pipe outside the electric reserved cable of the electric heating section, and completing the continuous connection work of the movable electric igniter capable of measuring temperature.
From the above, the splicing structure and method for the temperature-measurable mobile electric igniter internal cross-connection optical cable provided by the invention have the following beneficial effects:
according to the splicing structure and the method for the temperature-measurable mobile electric igniter internal cross-connection optical cable, three splicing protective layers are adopted for splicing protection of the electric igniter optical cable, the three splicing protective layers are protected layer by layer from inside to outside, each layer is protected by different processes, each layer of protection has different functions, the first splicing protective layer can perform insulation protection on the butt joint part of the reserved optical fiber of the electric heating section and the reserved optical fiber of the power supply cable, mechanical protection is performed, the mechanical strength of the butt joint part and the two sides of the butt joint part are guaranteed, and the butt joint safety is improved; the second splicing protective layer can perform insulation protection on the reserved optical fiber outer armor of the electric heating section and the reserved optical fiber outer armor of the power supply cable, so that insulation between the electric heating section and the outer armor of the power supply cable is ensured, and the optical fibers in the electric heating section and the power supply cable are not stretched or compressed when the electric heating section and the power supply cable are stretched or compressed; the third splicing protective layer strengthens the insulation protection function of the splicing protective layer inside the third splicing protective layer, ensures the mechanical strength and the insulativity of splicing, ensures that the outer wall of the electric igniter is uncharged, avoids electric shock accidents, and ensures that the electric igniter realizes the ignition monitoring integrated function.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:
FIG. 1: is a schematic diagram of the splicing structure of the cross-connecting optical cable in the mobile electric igniter capable of measuring temperature.
FIG. 2: is a schematic structural diagram of the first continuous connection protection layer of the present invention.
FIG. 3: is a schematic structural diagram of the second continuous connection protection layer of the present invention.
FIG. 4: schematic diagram of the optical fiber reserved for the electric heating section.
FIG. 5: schematic representation of where the optical fibers are reserved for the power supply cable.
In the figure:
100. a splicing structure of an optical cable is connected in the movable electric igniter capable of measuring temperature in a penetrating way;
1. a first continuous connection protective layer; 11. a first insulating protection tube; 12. a high temperature resistant bonding unit;
2. a second continuous connection protective layer; 21. a second insulating protective tube; 22. a positioning sleeve;
3. a third continuous connection protective layer;
41. a first optical fiber protective tube; 42. a second optical fiber protective tube;
91. an optical fiber is reserved in the electric heating section; 911. an optical fiber coating layer; 92. reserving optical fibers for the power supply cable; 93. the electric heating section is reserved with an optical fiber outer armor; 94. reserving optical fiber outer armor for the power supply cable; 95. an electrically conductive core of an electrical heating section; 96. a power supply cable conductive core; 97. electrically heating the section coiled tubing; 98. and a power supply cable coiled tubing.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
The specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 to 5, the present invention provides a splicing structure 100 for a temperature-measurable traveling electrical igniter inner-crossing cable, comprising a first splicing protection layer 1 which is insulated and coated on an outer side of a butt joint portion of an electrical heating section reserved optical fiber 91 (prior art, an outer sheath 93 of the electrical heating section reserved optical fiber is sheathed outside the electrical heating section reserved optical fiber, an electrical heating section conductive core 95 is arranged outside the outer sheath 93 of the electrical heating section reserved optical fiber), and a power supply cable reserved optical fiber 92 (prior art, an outer sheath 94 of the power supply cable reserved optical fiber is sheathed outside the power supply cable, a power supply cable conductive core 96 is arranged outside the outer sheath 94 of the power supply cable reserved optical fiber, the power supply cable conductive core 96 is not insulated from the outer sheath 94 of the power supply cable reserved optical fiber, the power supply cable conductive core 96 is conducted with the electrical heating section conductive core 95, and both the power supply cable reserved optical fiber conductive core 96 and the power supply cable outer sheath 94 need to be insulated from the outer sheath 93 of the electrical heating section reserved optical fiber to prevent the electrical heater from being electrified), the outer side of the first splicing protective layer 1 is radially sleeved with second splicing protective layers 2 at intervals, the second splicing protective layers 2 can be wrapped outside the electric heating section reserved optical fiber outer armor 93 and the power supply cable reserved optical fiber outer armor 94 in an insulating mode (the electric heating section reserved optical fiber 91 is exposed out of the electric heating section reserved optical fiber outer armor 93, the power supply cable reserved optical fiber 92 is exposed out of the power supply cable reserved optical fiber outer armor 94), and the outer side of the second splicing protective layers 2 is sleeved with a third splicing protective layer 3 in an insulating mode. The cross-under cables to be butted are all positioned in the continuous oil pipes, and after the operation of three layers of splicing protective layers is completed, the conductive cores on two sides (the conductive core 95 of the electric heating section and the conductive core 96 of the power supply cable) are connected, and the continuous oil pipes on two sides (the continuous oil pipe 97 of the electric heating section and the continuous oil pipe 98 of the power supply cable) are connected, so that the splicing work can be completed.
In the splicing structure of the temperature-measurable mobile electric igniter internal cross-connection optical cable, three splicing protective layers are adopted for splicing protection of the electric igniter optical cable, the three splicing protective layers are protected layer by layer from inside to outside, each layer is protected by different processes, each layer of protection has different functions, the first splicing protective layer can perform insulation protection on the butt joint part of the reserved optical fiber of the electric heating section and the reserved optical fiber of the power supply cable, and performs mechanical protection, so that the mechanical strength of the butt joint part and the two sides of the butt joint part is ensured, and the butt joint safety is improved; the second splicing protective layer can perform insulation protection on the reserved optical fiber outer armor of the electric heating section and the reserved optical fiber outer armor of the power supply cable, so that insulation between the electric heating section and the outer armor of the power supply cable is ensured, and the optical fibers in the electric heating section and the power supply cable are not stretched or compressed when the electric heating section and the power supply cable are stretched or compressed; the third splicing protective layer strengthens the insulation protection function of the splicing protective layer inside the third splicing protective layer, ensures the mechanical strength and the insulativity of splicing, ensures that the outer wall of the electric igniter is uncharged, avoids electric shock accidents, and ensures that the electric igniter realizes the ignition monitoring integrated function.
Further, as shown in fig. 1 and fig. 2, the first splicing protection layer 1 includes a first insulation protection tube 11, an inner diameter of the first insulation protection tube 11 is larger than outer diameters of the electrical heating section reserved optical fiber 91 and the power supply cable reserved optical fiber 92, a first inner ring space is formed between an inner wall of the first insulation protection tube 11 and an outer wall of the electrical heating section reserved optical fiber 91, a second inner ring space is formed between an inner wall of the first insulation protection tube 11 and an outer wall of the power supply cable reserved optical fiber 92, the first inner ring space and the second inner ring space are filled with a high temperature resistant bonding unit 12, and a heat resistant temperature of the high temperature resistant bonding unit 12 is up to 300 ℃.
In the present embodiment, the first insulating sheath 11 has a tube diameter of 0.25mm and a heat-resistant temperature of up to 300 ℃.
Further, as shown in fig. 1 and fig. 3, the second splicing protection layer 2 includes a second insulating protection tube 21, two ends of the second insulating protection tube 21 are respectively sealed and sleeved on the electrical heating section reserved optical fiber outer sheath 93 and the power supply cable reserved optical fiber outer sheath 94, and two ends of the second insulating protection tube 21 are respectively provided with an insulating positioning sleeve 22.
In the present embodiment, the second insulating sheath 21 has a tube diameter of 5mm and a heat-resistant temperature of 300 ℃ at most.
In the present embodiment, the positioning sleeve 22 is an insulating sleeve formed by winding an insulating tape, and the positioning sleeve 22 can wind and fix both ends of the second insulating protection tube 21; the outer diameters of the positioning sleeve 22 and the second insulating protection tube 21 are the same. In the process of taking off the electric heater, the second splicing protective layer 2 ensures that the outer sheaths of the optical fibers (the outer sheath 93 of the optical fiber reserved at the electric heating section and the outer sheath 94 of the optical fiber reserved on the power supply cable) at the two ends of the electric heater cannot be extruded inwards to cause the optical fibers inside the electric heater to be extruded, knotted and bent.
Further, as shown in fig. 1, the third continuous connection protection layer 3 includes an intertwined layer formed by winding a high-temperature resistant insulating tape, and the intertwined layer is wrapped outside the second insulating protection tube 21 and the positioning sleeve 22 in an insulating intertwined manner. In the actual operation process, a high-temperature-resistant insulating tape is wound from one side of the second splicing protective layer 2 to the other side to form a third layer of protection, and after certain mechanical strength is ensured, splicing work is completed. The heat-resistant temperature of the high-temperature-resistant insulating tape is 300 ℃ at most.
Further, as shown in fig. 1, the splicing structure 100 for a cross-under optical cable in a mobile electric igniter capable of measuring temperature further includes a first optical fiber protection tube 41 and a second optical fiber protection tube 42, the first optical fiber protection tube 41 is inserted between the electrical heating section reserved optical fiber 91 and the electrical heating section reserved optical fiber outer sheath 93, the second optical fiber protection tube 42 is inserted between the power supply cable reserved optical fiber 92 and the power supply cable reserved optical fiber outer sheath 94, and the first optical fiber protection tube 41 and the second optical fiber protection tube 42 are arranged in an insulating manner. In the present embodiment, the first optical fiber protective tube 41 and the second optical fiber protective tube 42 are high temperature resistant protective tubes, and the heat resistant temperature is 300 ℃. The first optical fiber protective tube 41 is fixed between the electrical heating section reserved optical fiber 91 and the electrical heating section reserved optical fiber outer armor 93 in an interference mode, the second optical fiber protective tube 42 is fixed between the power supply cable reserved optical fiber 92 and the power supply cable reserved optical fiber outer armor 94 in an interference mode, the outer end portions of the first optical fiber protective tube 41 and the second optical fiber protective tube 42 are wound and fixed through high-temperature-resistant 300-DEG C adhesive tapes, the first optical fiber protective tube 41 protects the electrical heating section reserved optical fiber 91 from being cut off by the end portion notch of the electrical heating section reserved optical fiber outer armor 93, and the second optical fiber protective tube 42 protects the power supply cable reserved optical fiber 92 from being cut off by the end portion notch of the electrical heating section reserved optical fiber outer armor 94.
The invention also provides a splicing method of the cross-under optical cable in the movable electric igniter capable of measuring the temperature, wherein the adjacent ends of the electrical heating section reserved optical fiber 91 and the power supply cable reserved optical fiber 92 are welded to form a butt joint part, and the outer side of the butt joint part is coated with the first splicing protective layer 1 of the splicing structure 100 of the cross-under optical cable in the movable electric igniter capable of measuring the temperature; a second splicing protective layer 2 for positioning the splicing structure 100 of the splicing optical cable in the movable electric igniter capable of measuring temperature is sleeved on the reserved optical fiber outer armor and the power supply cable outer armor of the electrical heating section at the outer side of the first splicing protective layer 1; the third splicing protective layer 3 of the splicing structure 100 of the optical cable in the mobile electric igniter capable of measuring temperature is wound outside the second splicing protective layer 2; and finally, connecting the electrical heating section reserved optical fiber 91 and the continuous oil pipe outside the power supply cable reserved optical fiber 92 to finish splicing work.
Specifically, the method comprises the following steps:
step a, preprocessing an electrical heating section reserved optical fiber and a power supply cable reserved optical fiber, so that the electrical heating section reserved optical fiber 91 protrudes out of an electrical heating section reserved optical fiber outer armor 93, and the power supply cable reserved optical fiber 92 protrudes out of a power supply cable reserved optical fiber outer armor 94; the state is shown in figures 4 and 5,
the optical cable is reserved when an electric heating section and a power supply cable are manufactured, the reserved length is 4-5 times of the width of an optical fiber fusion splicer (in the prior art, not shown in the figure) in principle, and meanwhile, the extra length required by stripping and cutting of an optical fiber coating layer 911 (in the prior art, coating the optical fiber) is considered;
stripping a coating layer (in the prior art) and cutting a section of an electrical heating section reserved optical fiber 91 and a power supply cable reserved optical fiber 92 which need to be butted;
the two sections of optical fibers are welded and exposed at the end parts of the reserved optical fiber outer armor 93 of the electric heating section and the reserved optical fiber outer armor 94 of the power supply cable, the reserved optical fiber 91 of the electric heating section needs to be mechanically protected after being welded with the reserved optical fiber 92 of the power supply cable, the reserved optical fiber outer armor 93 of the electric heating section and the reserved optical fiber outer armor 94 of the power supply cable need to be spliced and protected by a high-temperature-resistant 300 ℃ insulating phi 5mm second insulating protective tube 21, the reserved optical fiber outer armor 93 of the electric heating section and the reserved optical fiber outer armor 94 of the power supply cable cannot conduct electricity after splicing, the distance between the two sections cannot be increased or reduced, and the electric heating cable can bear a high-temperature environment of 300 ℃ and certain tensile strength;
inserting a first optical fiber protective tube 41 between an electrical heating section reserved optical fiber 91 and an electrical heating section reserved optical fiber outer armor 93, inserting a second optical fiber protective tube 42 between a power supply cable reserved optical fiber 92 and a power supply cable reserved optical fiber outer armor 94, and performing outer armor cut prevention on the electrical heating section reserved optical fiber 91 and the power supply cable reserved optical fiber 92;
step b, sleeving a second insulating protective tube 21 on the outer armor 93 of the reserved optical fiber of the electric heating section or the outer armor 94 of the reserved optical fiber of the power supply cable;
the second insulating protective tube 21 is sleeved on the outer armor 93 of the reserved optical fiber of the electric heating section or the outer armor 94 (generally, the longer side) of the reserved optical fiber of the power supply cable for temporary fixation and standby;
step c, sleeving the first insulating protective tube 11 outside the electrical heating section reserved optical fiber 91 or the power supply cable reserved optical fiber 92;
the first insulating protective tube 11 is sleeved on the electrical heating section reserved optical fiber 91 or the power supply cable reserved optical fiber 92 (generally, the longer side is taken), and passes through the rear suspension for fixation;
step d, welding the adjacent ends of the electrical heating section reserved optical fiber 91 and the power supply cable reserved optical fiber 92 to form a butt joint part, coating a high-temperature-resistant bonding unit 12 on the outer side of the butt joint part, moving and rotating the first insulating protective tube 11 to enable the high-temperature-resistant bonding unit 12 to be uniformly distributed, and curing and bonding the first insulating protective tube 11 at a high temperature to complete the first splicing protective layer 1, as shown in fig. 2;
the optical fiber fusion splicer is used for fusing the electrical heating section reserved optical fiber 91 and the power supply cable reserved optical fiber 92, and the butt joint part of the two sections of fused optical fibers is not protected by a coating layer and does not have any mechanical strength and needs to be protected.
Coating a high-temperature-resistant bonding unit 12 on a butt joint part (a bare part), slowly moving a high-temperature-resistant first insulating protective tube 11 to the other side (the electric heating section reserved optical fiber 91 is rotated to the power supply cable reserved optical fiber 92 or the power supply cable reserved optical fiber 92 is rotated to the electric heating section reserved optical fiber 91) until the tail end (the tail end in the moving direction) of the first insulating protective tube crosses the butt joint part, overlapping the front end (the head end in the moving direction) of the first insulating protective tube with a coating layer on the other side, and then moving the coating layer backwards and backwards, wherein the high-temperature-resistant bonding unit 12 (high-temperature-resistant bonding agent) is uniformly filled in the first insulating protective tube 11, and finally aligning the length center position of the first insulating protective tube 11 to the butt joint part to perform bonding protection by using a high-temperature curing process to complete continuous connection protection of optical fibers;
step e, moving the second insulating protective tube 21 to enable two ends of the second insulating protective tube to respectively abut against and be sleeved on the electrical heating section reserved optical fiber outer armor 93 and the power supply cable reserved optical fiber outer armor 94 in a sealing mode, and winding insulating tapes at two ends of the second insulating protective tube 21 to form insulating sleeves to complete the second splicing protective layer 2, as shown in fig. 3;
specifically, the distance between the outer sheaths 93 of the reserved optical fibers of the electric heating section or the outer sheaths 94 of the reserved optical fibers of the power supply cable is adjusted to be equal to the total length of the exposed part of the electric heating section reserved optical fibers 91 and the power supply cable reserved optical fibers 92 after being welded;
the second insulating protective tube 21 is moved to the other side (the electrical heating section reserved optical fiber 91 is the power supply cable reserved optical fiber 92 or the power supply cable reserved optical fiber 92 is the electrical heating section reserved optical fiber 91) to align the length center thereof with the optical fiber butt joint part, and the length of the overlapping part of the second insulating protective tube 21 and the electrical heating section reserved optical fiber outer armor 93 or the power supply cable reserved optical fiber outer armor 94 is equal (namely, the sleeving distance at the two ends is equal).
High-temperature-resistant insulating adhesive tapes are respectively wound at two ends of the second insulating protective tube 21 to form positioning sleeves 22, the outer diameter of each positioning sleeve 22 is the same as that of the second insulating protective tube 21, and the purpose of the positioning sleeves is to ensure that the outer armor 93 of the reserved optical fiber of the electrical heating section and the outer armor 94 of the reserved optical fiber of the power supply cable are not disconnected when the optical cable is compressed up and down, and the optical fiber inside the optical cable is not twisted;
and f, winding a high-temperature-resistant insulating tape from one end of the second continuous connection protective layer 2 to the other end to complete the third continuous connection protective layer 3, as shown in fig. 1.
Specifically, the high-temperature-resistant insulating adhesive tape is wound from one end (with enough bonding distance) of the second splicing protective layer 2 until the other end of the second splicing protective layer 2 is wound for a long enough bonding distance, and multiple layers are repeated to form a third splicing protective layer 3 resistant to high temperature of 300 ℃, so that when the electric heating section and the power supply cable section bear tension, the optical fibers in the third splicing protective layer do not bear any tension;
and step g, conducting the electric heating section conductive core 95 with the power supply cable conductive core 96 (in the prior art), welding the continuous oil pipe outside the power supply cable and the continuous oil pipe outside the electric heating section reserved cable (in the prior art, the continuous oil pipe 97 and the continuous oil pipe 98 of the electric heating section are both positioned in the continuous oil pipe), and completing the continuous connection work of the movable electric igniter capable of measuring the temperature.
From the above, the splicing structure and method for the temperature-measurable mobile electric igniter internal cross-connection optical cable provided by the invention have the following beneficial effects:
according to the splicing structure and the method for the temperature-measurable mobile electric igniter internal cross-connection optical cable, three splicing protective layers are adopted for splicing protection of the electric igniter optical cable, the three splicing protective layers are protected layer by layer from inside to outside, each layer is protected by different processes, each layer of protection has different functions, the first splicing protective layer can perform insulation protection on the butt joint part of the reserved optical fiber of the electric heating section and the reserved optical fiber of the power supply cable, mechanical protection is performed, the mechanical strength of the butt joint part and the two sides of the butt joint part are guaranteed, and the butt joint safety is improved; the second splicing protective layer can perform insulation protection on the reserved optical fiber outer armor of the electric heating section and the reserved optical fiber outer armor of the power supply cable, so that insulation between the electric heating section and the outer armor of the power supply cable is ensured, and the optical fibers in the electric heating section and the power supply cable are not stretched or compressed when the electric heating section and the power supply cable are stretched or compressed; the third splicing protective layer strengthens the insulation protection function of the splicing protective layer inside the third splicing protective layer, ensures the mechanical strength and the insulativity of splicing, ensures that the outer wall of the electric igniter is uncharged, avoids electric shock accidents, and ensures that the electric igniter realizes the ignition monitoring integrated function.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.
Claims (11)
1. The splicing structure of the cross-under optical cable in the movable electric igniter capable of measuring the temperature is characterized by comprising a first splicing protective layer which is coated on the outer side of the butt joint part of a reserved optical fiber of an electric heating section and a reserved optical fiber of a power supply cable in an insulating way, wherein a second splicing protective layer is radially sleeved on the outer side of the first splicing protective layer at intervals, the second splicing protective layer can be coated on the outer side of an outer armor of the reserved optical fiber of the electric heating section and the outer armor of the reserved optical fiber of the power supply cable in an insulating way, and a third splicing protective layer is sleeved on the outer side of the second splicing protective layer in an insulating way.
2. The splicing structure of the cross-under optical cable in the temperature-measurable mobile electric igniter as claimed in claim 1, wherein the first splicing protective layer includes a first insulating protective tube, an inner diameter of the first insulating protective tube is larger than outer diameters of the electrical heating section reserved optical fiber and the power supply cable reserved optical fiber, a first inner ring space is formed between an inner wall of the first insulating protective tube and an outer wall of the electrical heating section reserved optical fiber, a second inner ring space is formed between the inner wall of the first insulating protective tube and an outer wall of the power supply cable reserved optical fiber, and the first inner ring space and the second inner ring space are filled with high temperature resistant bonding units.
3. The splicing structure for a cross-under cable in a mobile electric igniter capable of measuring temperature according to claim 2, wherein the second splicing protecting layer comprises a second insulating protecting tube, two ends of the second insulating protecting tube are respectively sealed and abutted against the outer sheath of the reserved optical fiber of the electric heating section and the outer sheath of the reserved optical fiber of the power supply cable, and two ends of the second insulating protecting tube are respectively provided with an insulating positioning sleeve.
4. The splicing structure of a threading cable in a mobile electric igniter capable of measuring temperature of claim 3, wherein the positioning sleeve is an insulating sleeve formed by winding an insulating tape.
5. The splicing structure of a threading cable in a portable electric igniter capable of measuring temperature of claim 3, wherein the third splicing protective layer comprises a tangled layer formed by winding a high temperature resistant insulating tape, and the tangled layer is wrapped outside the second insulating protective tube and the positioning sleeve in an insulating and intertwining manner.
6. The splicing structure for a cross-under cable in a mobile electric igniter capable of measuring temperature of claim 3, further comprising a first optical fiber protection tube and a second optical fiber protection tube, wherein the first optical fiber protection tube is inserted between the electrical heating section reserved optical fiber and the electrical heating section reserved optical fiber outer sheath, the second optical fiber protection tube is inserted between the power supply cable reserved optical fiber and the power supply cable reserved optical fiber outer sheath, and the first optical fiber protection tube and the second optical fiber protection tube are arranged in an insulating manner.
7. The splice structure for a feedthrough optical cable in a mobile electric igniter capable of measuring temperature of claim 6, wherein the first and second optical fiber sheaths are high temperature-resistant sheaths having a heat resistance temperature of up to 300 ℃.
8. The splicing structure of a threading cable in a mobile electric igniter capable of measuring temperature according to claim 3, wherein the first insulating protective tube has a tube diameter of 0.25mm and a heat-resistant temperature of up to 300 ℃.
9. The splicing structure of a threading cable in a mobile electric igniter capable of measuring temperature according to claim 3, wherein the second insulating protective tube has a tube diameter of 5mm and a heat-resistant temperature of up to 300 ℃.
10. A splicing method of a cross-under optical cable in a mobile electric igniter capable of measuring temperature, which is characterized in that adjacent ends of an electrical heating section reserved optical fiber and a power supply cable reserved optical fiber are welded to form a butt joint part, and a first splicing protective layer of a splicing structure of the cross-under optical cable in the mobile electric igniter capable of measuring temperature according to any one of claims 1 to 9 is coated on the outer side of the butt joint part; sleeving a second splicing protective layer on the reserved optical fiber outer armor of the electric heating section and the reserved optical fiber outer armor of the power supply cable on the splicing structure for positioning the temperature-measurable mobile electric igniter internal cross-connection optical cable according to any one of claims 1 to 9; winding a third splicing protective layer of the splicing structure of the temperature-measurable mobile electric igniter according to any one of claims 1 to 9 through the optical cable on the outer side of the second splicing protective layer.
11. The method of splicing a cross-under cable in a mobile electric j ig that measures temperature of claim 10, comprising the steps of:
step a, preprocessing an electrical heating section reserved optical fiber and a power supply cable reserved optical fiber, enabling the electrical heating section reserved optical fiber to protrude and expose out of an electrical heating section reserved optical fiber outer armor, and enabling the power supply cable reserved optical fiber to protrude and expose out of a power supply cable reserved optical fiber outer armor;
b, sleeving a second insulating protective pipe on the outer armor of the reserved optical fiber of the electric heating section or the outer armor of the reserved optical fiber of the power supply cable;
step c, sleeving the first insulating protective pipe on the outer side of the reserved optical fiber of the electric heating section or the reserved optical fiber of the power supply cable;
d, welding adjacent ends of the electrical heating section reserved optical fiber and the power supply cable reserved optical fiber to form a butt joint part, coating a high-temperature-resistant bonding unit on the outer side of the butt joint part, moving and rotating the first insulating protective pipe to enable the high-temperature-resistant bonding unit to be uniformly distributed, and curing and bonding the first insulating protective pipe at high temperature to complete a first splicing protective layer;
e, moving the second insulating protective tube to enable two ends of the second insulating protective tube to respectively abut against and be sleeved on the reserved optical fiber outer armor of the electric heating section and the reserved optical fiber outer armor of the power supply cable in a sealing mode, and winding insulating tapes on two ends of the second insulating protective tube to form insulating sleeves to complete a second splicing protective layer;
f, winding a high-temperature-resistant insulating tape from one end of the second continuous connection protective layer to the other end of the second continuous connection protective layer to finish the third continuous connection protective layer;
and g, conducting the electric conduction core of the electric heating section with the electric conduction core of the power supply cable, welding the continuous oil pipe outside the power supply cable with the continuous oil pipe outside the electric reserved cable of the electric heating section, and completing the continuous connection work of the movable electric igniter capable of measuring temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010841054.6A CN114077012A (en) | 2020-08-20 | 2020-08-20 | Splicing structure and method for splicing optical cable in movable electric igniter capable of measuring temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010841054.6A CN114077012A (en) | 2020-08-20 | 2020-08-20 | Splicing structure and method for splicing optical cable in movable electric igniter capable of measuring temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114077012A true CN114077012A (en) | 2022-02-22 |
Family
ID=80282954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010841054.6A Pending CN114077012A (en) | 2020-08-20 | 2020-08-20 | Splicing structure and method for splicing optical cable in movable electric igniter capable of measuring temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114077012A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1278171A (en) * | 1969-09-18 | 1972-06-14 | S I R T I Soc It Reti Telefoni | A process for the joining of coaxial cables having intermediate insulation of low melting point material, in particular of coaxial "micro" cables having intermediate insulation of expanded plastics material, and the joiny thus obtained |
| CN101414034A (en) * | 2008-11-13 | 2009-04-22 | 北京兴迪仪器有限责任公司 | Built-in temperature measuring optical cable |
| US20090324177A1 (en) * | 2006-01-09 | 2009-12-31 | Charles Qian | Fiber optic cable splice and cable reconstruction |
| CN201965280U (en) * | 2011-03-29 | 2011-09-07 | 金海新源电气江苏有限公司 | Connection device for armored temperature-measuring cables |
| CN102810837A (en) * | 2012-03-16 | 2012-12-05 | 远东电缆有限公司 | Intermediate splicing closure and splicing method for optical fiber composite power cable |
| CN103268990A (en) * | 2013-04-22 | 2013-08-28 | 深圳市沃尔核材股份有限公司 | Cable built-in optical fiber intermediate connecting device and connecting method thereof |
| US20150160415A1 (en) * | 2013-12-05 | 2015-06-11 | Jeffrey M. Lloyd | Flexible, Low Profile Kink Resistant Fiber Optic Splice Tension Sleeve |
| CN106300221A (en) * | 2016-09-30 | 2017-01-04 | 中国石油天然气股份有限公司 | A kind of down-hole steel pipe type cable adapter |
| CN111175919A (en) * | 2020-01-17 | 2020-05-19 | 同济大学 | Bending-resistant protection method for armored optical cable connection part in cast-in-place concrete structure |
| CN111399153A (en) * | 2020-05-12 | 2020-07-10 | 信达科创（唐山）石油设备有限公司 | Logging packaged optical fiber pipe cable and preparation method thereof |
| CN114787676A (en) * | 2019-12-05 | 2022-07-22 | 康普技术有限责任公司 | Flexible splice protector assembly and method for making same |
-
2020
- 2020-08-20 CN CN202010841054.6A patent/CN114077012A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1278171A (en) * | 1969-09-18 | 1972-06-14 | S I R T I Soc It Reti Telefoni | A process for the joining of coaxial cables having intermediate insulation of low melting point material, in particular of coaxial "micro" cables having intermediate insulation of expanded plastics material, and the joiny thus obtained |
| US20090324177A1 (en) * | 2006-01-09 | 2009-12-31 | Charles Qian | Fiber optic cable splice and cable reconstruction |
| CN101414034A (en) * | 2008-11-13 | 2009-04-22 | 北京兴迪仪器有限责任公司 | Built-in temperature measuring optical cable |
| CN201965280U (en) * | 2011-03-29 | 2011-09-07 | 金海新源电气江苏有限公司 | Connection device for armored temperature-measuring cables |
| CN102810837A (en) * | 2012-03-16 | 2012-12-05 | 远东电缆有限公司 | Intermediate splicing closure and splicing method for optical fiber composite power cable |
| CN103268990A (en) * | 2013-04-22 | 2013-08-28 | 深圳市沃尔核材股份有限公司 | Cable built-in optical fiber intermediate connecting device and connecting method thereof |
| US20150160415A1 (en) * | 2013-12-05 | 2015-06-11 | Jeffrey M. Lloyd | Flexible, Low Profile Kink Resistant Fiber Optic Splice Tension Sleeve |
| CN106300221A (en) * | 2016-09-30 | 2017-01-04 | 中国石油天然气股份有限公司 | A kind of down-hole steel pipe type cable adapter |
| CN114787676A (en) * | 2019-12-05 | 2022-07-22 | 康普技术有限责任公司 | Flexible splice protector assembly and method for making same |
| CN111175919A (en) * | 2020-01-17 | 2020-05-19 | 同济大学 | Bending-resistant protection method for armored optical cable connection part in cast-in-place concrete structure |
| CN111399153A (en) * | 2020-05-12 | 2020-07-10 | 信达科创（唐山）石油设备有限公司 | Logging packaged optical fiber pipe cable and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102509989B (en) | Manufacturing method of but joints of elongated cables for geotechnical engineering instruments | |
| US4367917A (en) | Multiple sheath cable and method of manufacture | |
| NO164141B (en) | PROCEDURE AND APPARATUS FOR COMPOUNDING THE OUTER END OF TWO OPTICAL FIBER CABLES FOR UNDERWATER USE. | |
| EP0137720A2 (en) | Technique for repairing and joining small diameter optical fiber cables | |
| EP1928067B1 (en) | Method of constructing a normal joint structure of a superconducting cable | |
| US5315682A (en) | Splice device for splicing together under-sea optical cables | |
| CN112799190A (en) | Flame-retardant fireproof communication optical cable and preparation method thereof | |
| CN102313929B (en) | Fiber splicing protector and protection method | |
| IT9019720A1 (en) | JOINT FOR CABLES AND CORES OF FIBER OPTIC CABLES AND METHOD FOR ITS REALIZATION | |
| CN114077012A (en) | Splicing structure and method for splicing optical cable in movable electric igniter capable of measuring temperature | |
| CN111983755B (en) | Longitudinal cutting and splicing method for optical cable bundle tube | |
| CN106159483A (en) | The termination of a kind of fireproof cable and method thereof | |
| JP2005202265A (en) | Fire-resisting optical cable | |
| JP2670382B2 (en) | Metal tube coated optical fiber connection part and connection method thereof | |
| EP4290717A1 (en) | Joint assembly for asymmetric power cables having an optical fiber cable embedded at different radial positions, joint system and method for installing such a joint assembly | |
| CN220208608U (en) | Cable with improved cable tension | |
| US20050141832A1 (en) | Armouring joint, an armoured cable joint and a method for jointing armouring of two armoured cables | |
| CN216133986U (en) | Full-recovery type cable welding head | |
| CN210270307U (en) | High-temperature-resistant optical fiber for communication engineering construction | |
| CN109818304B (en) | Connection assembly and connection method for coaxial cable and coaxial cable system | |
| CN213636318U (en) | Crosslinked polyethylene insulation mould injection melting type power cable intermediate joint | |
| CN212113267U (en) | High-insulation glass fiber conduit | |
| JP4780325B2 (en) | Waterproof structure for cable connection | |
| JPH04104106A (en) | Reinforcing method for connection part of coated optical fiber sheathed with metallic pipe | |
| EP1059549B1 (en) | Submarine casing for a submarine optical connector with a bonded metal sheath which comprises a metal sheet and a sleeve with an inner metal liner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |