CN115706397B - Preparation method of underground cable head and underground cable head - Google Patents
Preparation method of underground cable head and underground cable head Download PDFInfo
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- CN115706397B CN115706397B CN202110925117.0A CN202110925117A CN115706397B CN 115706397 B CN115706397 B CN 115706397B CN 202110925117 A CN202110925117 A CN 202110925117A CN 115706397 B CN115706397 B CN 115706397B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 229920001971 elastomer Polymers 0.000 claims abstract description 55
- 239000000463 material Substances 0.000 claims abstract description 41
- 238000005488 sandblasting Methods 0.000 claims abstract description 21
- 229920001973 fluoroelastomer Polymers 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 14
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000004140 cleaning Methods 0.000 claims abstract description 11
- 238000005498 polishing Methods 0.000 claims abstract description 6
- 230000003213 activating effect Effects 0.000 claims abstract description 4
- 239000003292 glue Substances 0.000 claims description 40
- 238000002347 injection Methods 0.000 claims description 32
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- 238000004513 sizing Methods 0.000 claims description 30
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Abstract
The application provides a preparation method of an underground cable head and the underground cable head, and belongs to the technical field of geophysical prospecting engineering technology and equipment. According to the technical scheme provided by the embodiment of the application, the inner wall of the cavity in the cable head body is processed to have certain roughness, the inner wall of the cavity is subjected to sand blasting, alcohol cleaning, heating and the like, and the wire part of the cable is subjected to polishing, activating and drying treatment, so that the surfaces of the cable and the wire part are sufficiently cleaned, the cable head body and the cable are respectively adhered to fluororubber, the cable head body and the cable are assembled together, fluororubber mixed rubber material is adopted as a raw material, the fluororubber mixed rubber material is subjected to remixing and is injected into the cavity in the cable head assembly body for multiple times, and after natural cooling, the rubber material in the cavity is solidified to form rubber, so that the solidified rubber can resist high temperature, high pressure and corrosion, is not easy to run off or be polluted when the cable is in a downhole high-temperature and high-pressure environment, and therefore, the cable is free from faults during long time use, and shutdown overhaul is avoided.
Description
Technical Field
The application relates to the technical field of geophysical engineering and equipment, in particular to a preparation method of an underground cable head and the underground cable head.
Background
In geophysical prospecting engineering, a seismic instrument in a well is connected with a cable through a cable head, a connecting cavity is formed in the cable head, a wire penetrates through the connecting cavity, and silicone grease is filled in the connecting cavity so as to achieve an insulating sealing effect.
Because the underground working needs to bear high temperature, high pressure and erosion of slurry, the traditional silicone grease filling has the phenomenon of partial loss and pollution in the working environment, and the headstall needs to be maintained after each operation is finished, so that the silicone grease in the cavity is supplemented or replaced. In a well, the earthquake project has extremely high requirements on the insulating property of underground instruments, and the long-term dynamic monitoring project requires that the underground earthquake instruments are parked in a target stratum in a shaft for a long time. In the long-time parking process of the instrument, the slurry in the shaft erodes the cable head internal connection cavity along the instrument gap under the action of high temperature and high pressure of the stratum, so that the silicone grease in the connection cavity is lost or polluted, thereby causing the problem of instrument sealing and insulation, leading the instrument to fail and requiring shutdown maintenance.
Disclosure of Invention
The embodiment of the application provides a preparation method of an underground cable head and the underground cable head, which can resist high temperature, high pressure and corrosion, and the solidified rubber is not easy to run off or be polluted when the underground cable head is in an underground high-temperature and high-pressure environment, so that the underground cable head can be used for a long time without faults, and the shutdown maintenance is avoided. The technical scheme is as follows:
In one aspect, a method of making a downhole cable head is provided, the method comprising:
acquiring a cable head body, wherein the surface roughness of the inner wall of a cavity in the cable head body is 5-10;
Sand blasting is carried out on the inner wall of the cavity;
Cleaning the sand blasting position of the inner wall of the cavity by alcohol so that sand grains do not fall off at the sand blasting position;
heating, preserving heat and naturally cooling the cable head body;
Acquiring a cable to be installed, polishing, activating and drying a wire part of the cable;
coating adhesive on the inner wall of the cavity in the cooled cable head body and the wire part of the cable;
The cable passes through the cable head body along the sequence of the first end, the cavity and the second end, and the cable head body and the cable are assembled together to form a cable head assembly body;
selecting fluororubber mixed sizing materials with corresponding specifications based on the service environment of the cable head;
The selected fluororubber mixed rubber material is reworked, so that the reworked rubber material has a preset thickness, the ambient temperature in the reworking process is 25+/-5 ℃, and the preset thickness is 2 mm+/-0.1 mm;
dividing the glue stock into 2-3 cup parts after weighing according to the total amount of the glue injection cup and the glue injection;
Placing the cable head assembly in a glue injection mold, and placing the cable head assembly and the glue injection mold in a vulcanizing machine for preheating at 80+/-5 ℃;
Pouring sizing material into the glue injection port for 2-3 times through a glue cup, and preserving heat and pressure after pouring is completed;
And taking the cable head assembly after casting out of the glue injection mold, and carrying out on-off detection and insulation detection on the cable head assembly after casting out after natural cooling.
In one possible implementation, before the sandblasting the inner wall of the cavity, the preparation method further comprises:
a paper tape is used to affix the non-sandblasted area for protection of the non-sandblasted area.
In one possible implementation, the heating, insulating and naturally cooling treatment is performed on the cable head body, including:
placing the cable head body in an oven, setting the temperature of the oven to 80+/-5 ℃, and heating the cable head body by adopting the oven;
after 2 hours of heat preservation, the cable head is taken out from the oven and naturally cooled.
In one possible implementation, the wire portion of the cable is sanded with a 500-700 mesh sandpaper.
In one possible implementation, the drying process is performed on the wire portion of the cable, including:
Cleaning the wire part with alcohol, wrapping cotton yarn, and drying on a heating plate.
In one possible implementation, the coating of the adhesive on the inner wall of the cavity in the cooled cable head body, the wire portion of the cable, includes:
The inner wall of the cavity in the cooled cable head body and the lead part of the cable are coated with a kem lock adhesive 205, and the coating thickness is 0.05mm plus or minus 0.01mm;
After leaving to dry at room temperature, the coating of the kem lock adhesive 252 was continued with a thickness of 0.02 mm.+ -. 0.01mm, and the temperature was controlled at 32.+ -. 5 ℃ during operation.
In one possible implementation, after the assembling the cable head body and the cable together to form the cable head assembly, the method further includes:
and carrying out on-off detection and insulation detection on the assembled cable head assembly.
In one possible implementation manner, the set temperature corresponding to the heat preservation and pressure maintaining after the casting is completed is 145+/-5 ℃, the set pressure is 55 MPa+/-5 MPa, and the set time is 1h.
In one possible implementation manner, the cable head assembly after casting is taken out from the glue injection mold, and after natural cooling, the preparation method further comprises:
And removing redundant sizing materials at the positions of the glue injection ports.
In one aspect, there is provided a downhole cable head made using a method of making a downhole cable head as provided in any one of the possible implementations above, the downhole cable head comprising: the cable head comprises a cable head body, a cable and filling rubber;
the first end and the second end of the cable head body are provided with openings, and a cavity is formed in the cable head body;
the cable passes through the cable head body along the sequence of the first end, the cavity and the second end, and the first end, the second end and the cable are all in closed connection;
The filling rubber is poured and solidified in the cavity and is respectively bonded with the inner wall of the cavity and the wire part of the cable.
According to the technical scheme provided by the embodiment of the application, the inner wall of the cavity in the cable head body is processed to have certain roughness, the inner wall of the cavity is subjected to sand blasting, alcohol cleaning, heating and the like, and the wire part of the cable is subjected to polishing, activating and drying treatment, so that the surfaces of the cable and the wire part are sufficiently cleaned, the cable head body and the cable are adhered to each other, after the cable head assembly is formed, the cable head assembly is prepared by adopting fluororubber mixed sizing material as a raw material, the fluororubber mixed sizing material is reworked and injected into the cavity in the cable head assembly for a plurality of times, after the sizing material is naturally cooled, the sizing material in the cavity is solidified to form rubber, and the solidified rubber can resist high temperature, high pressure and corrosion and is difficult to run off or be polluted when in a downhole high-temperature and high-pressure environment, so that faults can not occur for a long time, and shutdown maintenance is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for preparing a downhole cable head according to an embodiment of the present application;
FIG. 2 is a flow chart of a method for preparing a downhole cable head according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a downhole cable head according to an embodiment of the present application.
The reference numerals for the various parts in the drawings are as follows:
1-a cable head body;
11-a first end;
12-a second end;
13-a cavity;
2-cables;
3-filling rubber;
4-a glue injection cup;
5-injecting glue;
6-wire seal.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
In the present application, unless explicitly specified and limited otherwise, terms such as "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly attached, detachably attached, or integrally attached; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
Fig. 1 is a flowchart of a method for preparing a downhole cable head according to an embodiment of the present application, please refer to fig. 1, the method includes:
101. the cable head body 1 is obtained, and the surface roughness of the inner wall of the cavity 13 in the cable head body 1 is 5-10.
102. The inner wall of the cavity 13 is sandblasted.
103. The sand blasting portion of the inner wall of the cavity 13 was cleaned with alcohol so that no sand particles were removed from the sand blasting portion.
104. The cable head body 1 is subjected to heating, heat preservation and natural cooling treatment.
105. The cable 2 to be installed is obtained, and the conductor portion of the cable 2 is subjected to polishing, activation and drying treatment.
106. The cooled inner wall of the cavity 13 in the cable head body 1 and the wire part of the cable 2 are coated with adhesive.
107. The cable 2 is passed through the cable head body 1 in the order of the first end 11, the cavity 13 and the second end 12, and the cable head body 1 and the cable 2 are assembled together to form a cable head assembly.
108. And selecting fluororubber mixed sizing materials with corresponding specifications based on the service environment of the cable head.
109. And (3) remilling the selected fluororubber mixed rubber material to ensure that the remilled rubber material has a preset thickness, wherein the ambient temperature in the remilling process is 25+/-5 ℃, and the preset thickness is 2 mm+/-0.1 mm.
110. And (3) dividing the rubber into 2-3 parts after weighing the rubber according to the total amount of the rubber injecting cup 4 and the rubber injecting.
111. The cable head assembly is placed in a glue injection mold 5, and the cable head assembly and the glue injection mold 5 are placed in a vulcanizing machine for preheating, wherein the preheating temperature is 80+/-5 ℃.
112. Pouring the sizing material into the glue injection port for 2-3 times through a glue cup, and preserving heat and pressure after pouring is completed.
113. And taking the cable head assembly after casting out of the glue injection mold 5, and carrying out on-off detection and insulation detection on the cable head assembly after casting out after natural cooling.
According to the preparation method provided by the embodiment of the application, the inner wall of the cavity 13 in the cable head body 1 is processed to have certain roughness, the inner wall of the cavity 13 is subjected to sand blasting, alcohol cleaning, heating and other treatments, and the wire part of the cable 2 is polished, activated and dried, so that the surfaces of the cable head body 1 and the cable 2 are sufficiently cleaned, the cable head body and the cable 2 are respectively adhered to each other, after the cable head assembly is formed, the fluororubber mixed sizing material is adopted as a raw material, and is subjected to remixing and is injected into the cavity 13 in the assembled cable head assembly for a plurality of times, after the sizing material is naturally cooled, the sizing material in the cavity 13 is solidified to form rubber, the solidified rubber can resist high temperature, high pressure and corrosion, and is not easy to run off or be polluted when the cable head assembly is in a downhole high-temperature high-pressure environment, so that faults can be avoided for a long time, and shutdown and overhaul is avoided.
In one possible implementation, the method of preparing further comprises, before the blasting the inner wall of the cavity 13:
a paper tape is used to affix the non-sandblasted area for protection of the non-sandblasted area.
In one possible implementation, the heating, insulating and natural cooling treatment is performed on the cable head body 1, including:
Placing the cable head body 1 in an oven, setting the temperature of the oven to 80+/-5 ℃, and heating the cable head body 1 by adopting the oven;
after 2 hours of heat preservation, the cable head is taken out from the oven and naturally cooled.
In one possible implementation, the wire portion of the cable 2 is sanded with a 500-700 mesh sandpaper.
In one possible implementation, the drying process is performed on the wire portion of the cable 2, including:
Cleaning the wire part with alcohol, wrapping cotton yarn, and drying on a heating plate.
In one possible implementation, the application of the adhesive on the inner wall of the cavity 13 in the cooled cable head body 1, on the wire portion of the cable 2, comprises:
The inner wall of the cavity 13 in the cooled cable head body 1 and the wire part of the cable 2 are coated with a kem roc adhesive 205, and the coating thickness is 0.05mm plus or minus 0.01mm;
After leaving to dry at room temperature, the coating of the kem lock adhesive 252 was continued with a thickness of 0.02 mm.+ -. 0.01mm, and the temperature was controlled at 32.+ -. 5 ℃ during operation.
In one possible implementation, after the cable head body 1 and the cable 2 are assembled together to form a cable head assembly, the preparation method further includes:
and carrying out on-off detection and insulation detection on the assembled cable head assembly.
In one possible implementation manner, the set temperature corresponding to the heat preservation and pressure maintaining after the casting is completed is 145+/-5 ℃, the set pressure is 55 MPa+/-5 MPa, and the set time is 1h.
In one possible implementation manner, the cable head assembly after casting is taken out from the glue injection mold 5, and after natural cooling, the preparation method further comprises:
And removing redundant sizing materials at the positions of the glue injection ports.
Any combination of the above optional solutions may be adopted to form an optional embodiment of the present application, which is not described herein.
Fig. 2 is a flowchart of a method for preparing a downhole cable head according to an embodiment of the present application, please refer to fig. 2, the method includes:
201. The cable head body 1 is obtained, and the surface roughness of the inner wall of the cavity 13 in the cable head body 1 is 5-20.
The cable head in this embodiment may also be a headstall, which is not limited in this embodiment.
In this step, the cable head body 1 includes: a housing, a wire seal 6 and a female pin.
Wherein the shell comprises an inner shell and an outer shell which are connected in a butt joint way, and a cavity in the middle of the inner shell and the outer shell forms a cavity 13.
The wire sealing member 6 is used for sealing wires, specifically, is located the cable 2 in die cavity 13, and one end is the integral structure, including inside wire and outside rubber protection cover, and the other end does not have the rubber protection cover, and many wires expose in die cavity 13, and are used for connecting the female contact pin of cable head body 1 tip, and cable head body 1 is stretched out to female contact pin's outer end for connect the seismic instrument.
The plurality of wires exposed in the cavity 13 are covered with wire seals 6 for sealing the wires from the space in the cavity 13.
In the mechanical design of the cable head body 1, the surface roughness of the rubber filling position can be designed to be 6.4, so that the sand blasting effect is better after the mechanical processing.
202. A paper tape is used to affix the non-sandblasted area for protection of the non-sandblasted area.
In this step, care needs to be taken to protect the wire through-hole portion in order to ensure the sealing performance of the cable head after the glue injection.
203. The inner wall of the cavity 13 is sandblasted.
The environment temperature is required to be 25 ℃ during sand blasting, and the sand blasting equipment is completely sealed. And removing the paper adhesive tape layer for protection after the sand blasting is finished.
204. The sand blasting portion of the inner wall of the cavity 13 was cleaned with alcohol so that no sand particles were removed from the sand blasting portion.
The step is mainly used for cleaning floating sand particles remained on the surface of the inner wall after the inner wall is blasted, so that the effect of bonding is prevented from being influenced by the floating sand particles.
205. The cable head body 1 is subjected to heating, heat preservation and natural cooling treatment.
Specifically, the cable head body 1 is placed in an oven, the temperature of the oven is set to 80+/-5 ℃, and the cable head body 1 is heated by adopting the oven; after 2 hours of heat preservation, the cable head is taken out from the oven, and naturally cooled, and oily dirt or residues on the inner wall of the cavity 13 can be removed by heating the oven, so that the inner wall of the cavity 13 is further cleaned.
206. The cable 2 to be installed is obtained, and the conductor portion of the cable 2 is subjected to polishing, activation and drying treatment.
Specifically, the wire part of the cable 2 is polished by using 500-700 meshes of water sand paper, so that floccules appear on the surface of the wire part, the bonding is convenient, and the electric conductivity and sealing performance of the wire are not damaged. Wherein, this water sand paper can be 600 mesh.
The conducting wire part is cleaned by alcohol, wrapped with cotton yarn and put on a heating plate for drying, thereby avoiding dust sticking.
207. The cooled inner wall of the cavity 13 in the cable head body 1 and the wire part of the cable 2 are coated with adhesive.
In this step, the adhesive serves to bond the inner wall of the cavity 13 in the cable head body 1, the wire portion of the cable 2 and the rubber. Specifically, the inner wall of the cavity 13 in the cooled cable head body 1 and the wire part of the cable 2 are coated with a kem roc adhesive 205, and the coating thickness is 0.05mm plus or minus 0.01mm; after leaving to dry at room temperature, the coating of the kem lock adhesive 252 was continued with a thickness of 0.02 mm.+ -. 0.01mm, and the temperature was controlled at 32.+ -. 5 ℃ during operation.
208. The cable 2 is passed through the cable head body 1 in the order of the first end 11, the cavity 13 and the second end 12, and the cable head body 1 and the cable 2 are assembled together to form a cable head assembly.
In this step, it should be ensured that the wire is sealed at the first end 11, the second end 12, and the wire seal 6.
209. And carrying out on-off detection and insulation detection on the assembled cable head assembly.
This step can ensure that the electrical portion of the cable head assembly is functionally intact.
210. And selecting fluororubber mixed sizing materials with corresponding specifications based on the service environment of the cable head.
The use environment mainly refers to pressure, temperature and chemical properties of liquid, and based on the use environment, the high-pressure-resistant, high-temperature-resistant and corrosion-resistant fluororubber compound is selected as a filling raw material.
211. And (3) remilling the selected fluororubber mixed rubber material to ensure that the remilled rubber material has a preset thickness, wherein the ambient temperature in the remilling process is 25+/-5 ℃, and the preset thickness is 2 mm+/-0.1 mm.
In the step, the fluororubber mixed rubber material is put into a rubber mixing mill for remilling. The remilling of rubber refers to a rubber mixing process performed after the rubber mixture is parked and before the rubber mixture is used. The purpose of the remilling is as follows:
① The various auxiliary agents are further uniformly dispersed in the sizing material;
② The sizing material becomes soft, and the molding operation is convenient;
③ The fluidity and the self-viscosity of the sizing material are improved, and the molding process and the operation process are facilitated;
④ Sizing adjustment, such as the resolution of silicone rubber structuring.
212. And (3) dividing the rubber into 2-3 parts after weighing the rubber according to the total amount of the rubber injecting cup 4 and the rubber injecting.
This step is used to prepare for subsequent split casting.
213. The cable head assembly is placed in a glue injection mold 5, and the cable head assembly and the glue injection mold 5 are placed in a vulcanizing machine for preheating, wherein the preheating temperature is 80+/-5 ℃.
The cable head body 1 is provided with an opening which is communicated with the cavity 13 inside, so that the opening is aligned with the glue injection port of the glue injection mold 5, and glue is conveniently cast into the cavity 13 through the glue injection port and the opening.
214. Pouring the sizing material into the glue injection port for 2-3 times through a glue cup, and preserving heat and pressure after pouring is completed.
The rubber mouth is aligned with the rubber cup, the rubber weighed in advance is sequentially put into the rubber cup according to parts, and the rubber is poured for 2-3 times. After casting, the corresponding set temperature of heat preservation and pressure maintaining is 145+/-5 ℃, the set pressure is 55 MPa+/-5 MPa, and the set time is 1h.
215. And taking out the cable head assembly body after casting from the glue injection mold 5, and naturally cooling.
The cable head assembly includes: the cable head body 1, the cable 2 and the rubber solidified in the cavity 13 can ensure the filling and sealing of the cable head cavity 13 by utilizing the stable chemical property of the rubber, thereby achieving the purpose of maintenance free.
216. And removing redundant sizing materials at the positions of the glue injection ports.
The step is used for ensuring that the appearance of the cable head assembly is smooth and round, and meets the use requirement.
217. And carrying out on-off detection and insulation detection on the cable head assembly after casting.
After the on-off detection and the insulation detection are qualified, the cable head can be put into use, has good bonding and sealing effects, and is free from maintenance in long-time underground use.
Any combination of the above optional solutions may be adopted to form an optional embodiment of the present application, which is not described herein.
According to the preparation method provided by the embodiment of the application, the inner wall of the cavity 13 in the cable head body 1 is processed to have certain roughness, the inner wall of the cavity 13 is subjected to sand blasting, alcohol cleaning, heating and other treatments, and the wire part of the cable 2 is polished, activated and dried, so that the surfaces of the cable head body 1 and the cable 2 are sufficiently cleaned, the cable head body and the cable 2 are respectively adhered to each other, after the cable head assembly is formed, the fluororubber mixed sizing material is adopted as a raw material, and is subjected to remixing and is injected into the cavity 13 in the assembled cable head assembly for a plurality of times, after the sizing material is naturally cooled, the sizing material in the cavity 13 is solidified to form rubber, the solidified rubber can resist high temperature, high pressure and corrosion, and is not easy to run off or be polluted when the cable head assembly is in a downhole high-temperature high-pressure environment, so that faults can be avoided for a long time, and shutdown and overhaul is avoided.
Fig. 3 is a schematic structural diagram of a downhole cable head according to an embodiment of the present application, referring to fig. 3, the downhole cable head is manufactured by using a method for manufacturing a downhole cable head provided in any one of the possible implementations described above, and the downhole cable head includes: a cable head body 1, a cable 2 and a filling rubber 3; the first end 11 and the second end 12 of the cable head body 1 are provided with openings, and a cavity 13 is formed in the cable head body; the cable 2 passes through the cable head body 1 along the sequence of the first end 11, the cavity 13 and the second end 12, and the first end 11, the second end 12 and the cable 2 are in closed connection; the filling rubber 3 is cast and solidified in the cavity 13 and is respectively bonded with the inner wall of the cavity 13 and the wire part of the cable 2.
The cable head in this embodiment may also be a headstall, which is not limited in this embodiment.
In this step, the cable head body 1 includes: a housing, a wire seal 6 and a female pin.
Wherein the shell comprises an inner shell and an outer shell which are connected in a butt joint way, and a cavity in the middle of the inner shell and the outer shell forms a cavity 13. Further, the first end 11 of the cable head body 1 may be an opening of an inner housing, the second end 12 of the cable head body 1 may be an opening of an outer housing,
The wire sealing member 6 is used for sealing wires, specifically, is located the cable 2 in die cavity 13, and one end is the integral structure, including inside wire and outside rubber protection cover, and the other end does not have the rubber protection cover, and many wires expose in die cavity 13, and are used for connecting the female contact pin of cable head body 1 tip, and cable head body 1 is stretched out to female contact pin's outer end for connect the seismic instrument.
The plurality of wires exposed in the cavity 13 are covered with wire seals 6 for sealing the wires from the space in the cavity 13.
In the mechanical design of the cable head body 1, the surface roughness of the rubber filling position can be designed to be 6.4, so that the sand blasting effect is better after the mechanical processing.
According to the underground cable head provided by the embodiment of the application, the inner wall of the cavity 13 in the cable head body 1 is processed to have certain roughness, the inner wall of the cavity 13 is subjected to sand blasting, alcohol cleaning, heating and other treatments, and the wire part of the cable 2 is polished, activated and dried, so that the surfaces of the cable head body 1 and the cable 2 are sufficiently cleaned to be convenient for bonding with fluororubber respectively, after the cable head body 1 and the cable 2 are assembled together to form a cable head assembly body, fluororubber mixed sizing material is adopted as a raw material, the fluororubber mixed sizing material is reworked and is injected into the cavity 13 in the assembled cable head assembly body for multiple times, after the sizing material is naturally cooled, the sizing material in the cavity 13 is solidified to form rubber, the solidified rubber can resist high temperature, high pressure and corrosion, is not easy to run off or be polluted when the cable head assembly body is in an underground high-temperature and high-pressure environment, so that maintenance can be avoided for a long time.
The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements within the spirit and principles of the present application.
Claims (9)
1. A method of making a downhole cable head, the method comprising:
Acquiring a cable head body (1), wherein the surface roughness of the inner wall of an inner cavity (13) of the cable head body (1) is 5-10;
Blasting sand to the inner wall of the cavity (13);
Cleaning the sand blasting position of the inner wall of the cavity (13) by alcohol so that sand grains do not fall off at the sand blasting position;
heating, heat preservation and natural cooling are carried out on the cable head body (1);
acquiring a cable (2) to be installed, and polishing, activating and drying a lead part of the cable (2);
coating adhesive on the inner wall of the cavity (13) in the cooled cable head body (1) and the wire part of the cable (2);
The inner wall of the cavity (13) in the cooled cable head body (1) and the lead part of the cable (2) are coated with a kem lock adhesive 205, and the coating thickness is 0.05mm plus or minus 0.01mm;
After standing and drying at room temperature, continuing to coat the kem lock adhesive 252 with the thickness of 0.02mm plus or minus 0.01mm, and controlling the temperature at 32 plus or minus 5 ℃ during operation;
Passing the cable (2) through the cable head body (1) along the sequence of a first end (11), a cavity (13) and a second end (12), and assembling the cable head body (1) and the cable (2) together to form a cable head assembly;
selecting fluororubber mixed sizing materials with corresponding specifications based on the service environment of the cable head;
The selected fluororubber mixed rubber material is reworked, so that the reworked rubber material has a preset thickness, the ambient temperature in the reworking process is 25+/-5 ℃, and the preset thickness is 2 mm+/-0.1 mm;
dividing the glue into 2-3 parts after weighing according to the total amount of the glue injection cup (4) and the glue injection;
Placing the cable head assembly into a glue injection mold (5), and placing the cable head assembly and the glue injection mold (5) into a vulcanizing machine for preheating, wherein the preheating temperature is 80+/-5 ℃;
Pouring sizing material into the glue injection port for 2-3 times through a glue cup, and preserving heat and pressure after pouring is completed;
and taking the cable head assembly after casting out of the glue injection mold (5), and carrying out on-off detection and insulation detection on the cable head assembly after casting out after natural cooling.
2. The method according to claim 1, characterized in that it further comprises, before said sandblasting the inner walls of the cavity (13):
a paper tape is used to attach the non-sandblasted area for protection of the non-sandblasted area.
3. The method according to claim 1, characterized in that said heating, insulating and naturally cooling the cable head body (1) comprises:
placing the cable head body (1) in an oven, setting the temperature of the oven to 80+/-5 ℃, and heating the cable head body (1) by adopting the oven;
And after the heat preservation is carried out for 2 hours, the cable head is taken out from the oven and naturally cooled.
4. The method according to claim 1, characterized in that the sanding of the conductor portion of the cable (2) is carried out with a sandpaper of 500-700 mesh.
5. The method according to claim 1, characterized in that said drying the wire portion of the cable (2) comprises:
And cleaning the wire part with alcohol, wrapping cotton yarn, and drying on a heating plate.
6. The method of manufacturing according to claim 1, wherein after said assembling together the cable head body (1) and the cable (2) to form a cable head assembly, the method of manufacturing further comprises:
and carrying out on-off detection and insulation detection on the assembled cable head assembly.
7. The preparation method according to claim 1, wherein the set temperature corresponding to the heat preservation and pressure maintaining after the casting is completed is 145 ℃ ± 5 ℃, the set pressure is 55MPa ± 5MPa, and the set time is 1h.
8. The method according to claim 1, wherein the cable head assembly after casting is taken out of the glue injection mold (5), and after natural cooling, the method further comprises:
And removing redundant sizing materials at the positions of the glue injection ports.
9. A downhole cable head made by the method of making a downhole cable head according to any one of claims 1-8, the downhole cable head comprising: a cable head body (1), a cable (2) and filling rubber (3);
the first end (11) and the second end (12) of the cable head body (1) are provided with openings, and a cavity (13) is formed in the cable head body;
the cable (2) passes through the cable head body (1) along the sequence of the first end (11), the cavity (13) and the second end (12), and the first end (11), the second end (12) and the cable (2) are all in closed connection;
The filling rubber (3) is cast and solidified in the cavity (13) and is respectively bonded with the inner wall of the cavity (13) and the wire part of the cable (2).
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| CN115706397B true CN115706397B (en) | 2024-05-28 |
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| US5700161A (en) * | 1995-10-13 | 1997-12-23 | Baker Hughes Incorporated | Two-piece lead seal pothead connector |
| GB9809212D0 (en) * | 1998-04-29 | 1998-07-01 | Tronic Ltd | Pothead |
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|---|---|
| CN115706397A (en) | 2023-02-17 |
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