CN115774303A - Underground optical cable splicing method - Google Patents
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- CN115774303A CN115774303A CN202211505571.1A CN202211505571A CN115774303A CN 115774303 A CN115774303 A CN 115774303A CN 202211505571 A CN202211505571 A CN 202211505571A CN 115774303 A CN115774303 A CN 115774303A
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Abstract
The invention relates to a method for splicing underground optical cables, which comprises the following steps: splicing and coating the optical fiber of the inner layer steel pipe; continuing the inner layer steel pipe; and the sheath steel pipe is connected, and the fiber-breaking connection and protection work are realized after the sheath steel pipe connection is finished. The invention can connect the optical cable of the underground oil well, does not need to install an optical cable connection box with huge volume at the connection point, has good pressure resistance and sealing performance at the connection part of the optical cable, meets the underground high-temperature and high-pressure use environment, and is particularly suitable for the construction and installation requirements of underground narrow space. The invention can be applied in the field of oil field shaft monitoring.
Description
Technical Field
The invention relates to the technical field of oil field shaft monitoring, in particular to a method for splicing underground optical cables.
Background
The optical cable of the oil well is an important component of an optical fiber sensing and monitoring system of the oil and gas well, and is a channel for sensing various underground parameters and transmitting information. The optical cable for oil well is usually tied up on the outer wall of casing or oil pipe by special fixture, so that the optical cable goes into well along with the casing or oil pipe. Due to the fact that the underground construction condition is poor and the diameter of the optical cable is small, the optical cable is easily damaged by an instrument, abraded with rocks or a sleeve or damaged by other mechanical external forces in the construction process, and the optical cable and the internal optical fiber are broken; at this time, the optical cable and the internal optical fiber need to be connected, so as to ensure the continuity and completeness of the optical fiber; or the broken optical cable is taken out and replaced by a new optical cable, so that the follow-up optical fiber shaft monitoring application can be met.
When the optical cable is put into the well along with the oil pipe, sometimes the optical cable needs to pass through a packer due to the fact that the packer is arranged in the part of the well, and the optical cable needs to be cut off and connected at the packer. For optical cables applied to ground laying, direct burial in soil, overhead or underwater, when the optical cables need to be connected, an optical cable splicing box is usually installed at the connection part, and the optical fibers are protected by a heat-shrinkable sleeve after being welded and are placed in the optical cable splicing box; the optical cable splicing box is designed to have the functions of water prevention, dust prevention and the like according to the application environment condition, has a better protection effect on an optical fiber splicing point and an optical cable joint part, and prevents the optical fiber at the splicing part from being damaged by external force and influencing the normal communication function of the optical fiber. However, the volume of the common optical cable splicing box is larger than the space which can be accommodated by a well hole or a shaft, and the common optical cable splicing box cannot adapt to the installation environment of the narrow space of an oil-gas well; secondly, with the increase of the depth of the oil-gas well, the underground temperature is also gradually increased and usually exceeds 100 ℃ or higher, and the common splicing box and the internal optical fiber heat-shrinkable sleeve are difficult to meet the requirement of enduring the underground high temperature for a long time; and thirdly, the underground pressure of oil and gas is large and almost exceeds the pressure in all land and underwater optical cable use environments, and although the common optical cable splicing box has certain sealing property, the sealing requirement of the underground high-pressure environment can not be met.
Therefore, an optical cable connection method which can adapt to a narrow space underground and meets the sealing performance requirements of a high-temperature and high-pressure environment underground needs to be researched urgently, so that the underground optical cable connection is safe and reliable, and the optical fiber monitoring application in the later period is ensured.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for splicing an underground optical cable, which can splice an underground optical cable in an oil well, and does not require a bulky optical cable splicing box to be installed at the splicing point, and the splicing portion of the optical cable has good pressure resistance and sealing performance, so as to meet the use environment of high temperature and high pressure in the well, and particularly meet the construction installation requirements of narrow space in the well.
In order to realize the purpose, the invention adopts the following technical scheme: a method of downhole cable splicing comprising: splicing and coating the optical fiber of the inner layer steel pipe; continuing the inner layer steel pipe; the sheath steel pipe is connected, and the fiber breaking connection and protection work are realized after the sheath steel pipe connection is completed.
Further, the optical cable is sequentially composed of an optical fiber, an inner steel pipe, a protective steel pipe and an encapsulation sheath from inside to outside;
the optical fiber 1 is an optical fiber at 150 ℃ or 300 ℃;
the inner steel pipe is a stainless steel pipe which is longitudinally welded, the sheath steel pipe is a stainless steel pipe which is longitudinally welded, and the packaging sheath is made of PP or FEP.
Further, the splicing and coating of the optical fiber of the inner steel tube comprises:
respectively sequentially stripping the packaging sheath, the sheath steel pipe and the inner steel pipe from the first end and the second end of the cut optical cable, cutting out the optical fiber from the inner steel pipe, pulling out the optical fiber, coating protection, reserving the optical fiber for connection, and enabling the cut part of the inner steel pipe to form a drawing variable-diameter part;
sleeving a first sleeved steel pipe prepared in advance into the inner layer steel pipe from the second end of the cut length, and exposing the optical fiber for later use;
the exposed optical fiber is used for connection and secondary coating protection, and the connection and coated connection point is subjected to optical fiber attenuation test, so that the optical fiber connection is completed after the use requirement is met;
slightly pushing the first sleeved steel pipe through the optical fiber splicing point, and sleeving the first sleeved steel pipe outside the splicing point until the first sleeved steel pipe reaches the drawing variable-diameter part of the inner layer steel pipe;
and respectively carrying out welding protection on the contact points of the two ends of the first sleeved steel pipe and the inner steel pipe, carrying out optical fiber attenuation test again after welding, and finishing the connection protection of the inner steel pipe if the test is qualified.
Further, the cut lengths of the layers on the first end of the optical cable cut are less than the cut lengths of the layers on the second end.
Further, stripping the first end and the second end of the optical cable cut off from the packaging sheath comprises:
stripping the packaging sheath by using a tool, stripping a section of length from the first end of the packaging sheath, stripping another section of length from the second end of the packaging sheath, exposing the steel tube of the protective layer without damaging the packaging sheath and leaving the packaging sheath for later use, and cleaning oil stain on the surface of the steel tube of the protective layer by using alcohol;
selecting a second sleeved steel pipe which is the same in material and wall thickness as the sheath steel pipe, wherein the inner diameter of the second sleeved steel pipe is required to be larger than the outer diameter of the sheath steel pipe, and the length of the second sleeved steel pipe is between the stripping lengths of the first end and the second end;
and sleeving the prepared second sleeving steel pipe into the sheath steel pipe from the second end of the packaging sheath for later use.
Further, after the first end and the second end of the optical cable are stripped of the packaging sheath, the method for stripping the steel tube with the sheath comprises the following steps:
circularly cutting the sheath steel pipe at the second end from a cutting point, wherein the cutting length is smaller than that of the packaging sheath at the second end, pulling out the cut sheath steel pipe from the inner steel pipe, and keeping the inner steel pipe;
performing circular cutting on the sheath steel pipe at the first end from a cutting point, wherein the cutting length is smaller than that of the packaging sheath at the first end, pulling out the cut sheath steel pipe from the inner layer steel pipe, and keeping the inner layer steel pipe;
and selecting a first sleeving steel pipe which is made of the same material as the inner steel pipe, has the same wall thickness and the same outer diameter for standby, wherein the length of the first sleeving steel pipe is between the intercepting length of the first end of the sheath steel pipe and the intercepting length of the second end of the sheath steel pipe.
Further, after the first end and the second end of the optical cable are stripped of the packaging sheath, the method for stripping the steel tube with the sheath comprises the following steps:
selecting a pipe drawing die, preprocessing the end of the inner steel pipe at the second end, sleeving the pipe into the prepared drawing die, performing drawing and reducing treatment on the inner steel pipe, performing drawing treatment for multiple times, measuring the outer diameter to enable the outer diameter to reach the inner diameter of the first sleeved steel pipe, stopping drawing, and taking down the drawing die;
and (3) preprocessing the end of the inner steel pipe at the first end, sleeving the end into a prepared drawing die, performing drawing and reducing treatment on the inner steel pipe, performing drawing treatment for multiple times, measuring the outer diameter to enable the outer diameter to be smaller than the inner diameter of the sleeved steel pipe, enabling the difference to be not more than a second preset value, stopping drawing, and taking down the drawing die.
Further, after the first end and the second end which are cut off by the optical cable are sequentially stripped of the packaging sheath and the sheath steel pipe, the method for stripping the inner steel pipe comprises the following steps: and respectively cutting off the inner steel pipe from the cutting points, cutting off the first section of length from one end of the inner steel pipe, cutting off the second section of length from the other end of the inner steel pipe, pulling out the cut-off inner steel pipe from the optical fiber, and reserving the optical fiber for optical fiber connection.
Further, carry out the continuation to the inlayer steel pipe, include: and lightly pushing the prepared second sleeved steel pipe to the connected first sleeved steel pipe of the inner layer steel pipe to a preset position, performing welding protection on contact points of two ends of the second sleeved steel pipe and the sheath steel pipe, and performing an optical fiber attenuation test after welding to test the second sleeved steel pipe to be qualified, thereby completing the connection protection of the sheath steel pipe.
Further, continue the sheath steel pipe, include: and (3) adopting a material similar to the packaging sheath to package and protect the continuous part of the steel tube of the sheath layer, so that the overall size is close to that of the original optical cable packaging sheath, and the optical performance test is carried out to be qualified and complete the complete continuous protection.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the optical fiber joint of the invention is coated and protected by temperature-resistant resin, and a traditional heat-shrinkable sleeve is not required to be installed, so that the optical fiber joint is well protected, and meanwhile, the optical fiber at the position still has good flexibility and light weight, and the stress of the optical fiber cannot be increased due to the weight of the heat-shrinkable sleeve.
2. The invention adopts the double-layer stainless steel pipe to protect the optical fiber fusion splicing section, does not need to install an optical cable splicing box, has small diameter of the steel pipe, and can meet the installation requirement of narrow space in the pit; the huge engineering quantity and high cost of replacing the optical cable again due to the breakage of the optical cable are avoided, and the engineering efficiency is improved.
3. The invention adopts the double-layer stainless steel pipe to protect the optical fiber welding section, has excellent high temperature resistance and corrosion resistance, and can meet the application environment of underground high temperature and high corrosion; and the steel pipe is welded with the original steel pipe polarity of the optical cable, the sealing performance is good, the compression resistance and the tensile strength are high, and the sealing requirement of the underground high-pressure environment is better met. The reliability of optical cable connection in underground high-temperature, high-pressure and high-corrosion environment is improved.
4. The invention can lead the disconnected special high-temperature-resistant optical fiber to be restored and connected, and has the integral sensing monitoring function again, the tensile strength is not influenced, the distributed monitoring function is not influenced, in addition, the original armored steel pipe protection measure can better protect the internal optical fiber connection, and the service performance of the integral oil well optical cable is ensured; the connected optical fiber and steel tube optical fiber unit can be used for subsequent production and engineering application, new optical fibers and materials do not need to be purchased again, the oil well optical cable is produced again, the cost is saved, and the waste is reduced.
5. The invention can not only carry out connection protection on special high-temperature resistant optical fibers with the same model, but also carry out selective connection and protection on optical fibers with different models, and if the invention is applied to the combined application of partially conventional optical fibers and partially special optical fibers, the invention avoids the embarrassment that special optical fibers are required to be completely adopted due to the requirement of the special optical fibers, and can greatly save the engineering investment cost.
6. The invention can be applied to oil well optical cables in the field of oil wells, and can also be applied to other application fields of special optical cables, such as furnace body monitoring, cable body monitoring, pipeline leakage monitoring and the like, and connection in the production and manufacturing process of special optical cables.
In conclusion, the invention can be widely applied to the field of the existing oil field shaft monitoring.
Drawings
FIG. 1 is a flow chart of a method for splicing downhole cables in accordance with an embodiment of the present invention;
FIG. 2 is a schematic view of a cable configuration according to an embodiment of the present invention;
reference numerals:
1-an optical fiber; 2-inner layer steel pipe; 3-steel pipe with protective layer; 4, packaging a sheath; 5, first sleeving a steel pipe; 6, second sleeving the steel pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The invention provides an underground optical cable splicing method, which belongs to an oil well optical cable for monitoring a shaft of an oil field and comprises the following steps of: splicing and coating the optical fiber of the inner layer steel pipe; continuing the inner layer steel pipe; and (4) the sheath steel pipe is connected, and the fiber breaking connection and protection work of the special high-temperature-resistant optical fiber is realized after the sheath steel pipe is connected. The invention can connect the optical cable of the underground oil well, does not need to install an optical cable connection box with huge volume at the connection point, has good pressure resistance and sealing performance at the connection part of the optical cable, meets the underground high-temperature and high-pressure use environment, and is particularly suitable for the construction and installation requirements of underground narrow space.
In one embodiment of the present invention, a method of splicing cables downhole is provided. In this embodiment, the connection method is first inside and outside, as shown in fig. 1, the method includes the following steps:
1) Splicing and coating the optical fiber of the inner tube;
2) Continuing the inner layer steel pipe;
3) And (4) the sheath steel pipe is connected, and the fiber breaking connection and protection work of the special high-temperature-resistant optical fiber is realized after the sheath steel pipe is connected.
In the above embodiment, as shown in fig. 2, the optical cable is composed of an optical fiber 1, an inner steel tube 2, a sheath steel tube 3 and a packaging sheath 4 in sequence from inside to outside. Wherein:
the optical fiber 1 is a 150 ℃ or 300 ℃ optical fiber.
The inner layer steel pipe 2 is a stainless steel pipe welded longitudinally, has the characteristics of sealing and tolerating radial high pressure, and provides a protection effect for the optical fiber 1.
The sheath steel pipe 3 is a stainless steel pipe longitudinally welded to provide mechanical and environmental protection for the optical cable.
The encapsulating jacket 4 is made of PP or FEP, and provides mechanical and frictional protection (round or square) for the jacket steel tube 3.
In the step 1), the optical fiber of the inner tube is jointed and coated, and the method comprises the following steps:
1.1 Respectively sequentially stripping the packaging sheath 4, the sheath steel tube 3 and the inner steel tube 2 from the cut first end and the cut second end of the optical cable, cutting and pulling out the optical fiber 1 from the inner steel tube 2, coating protection, reserving the optical fiber 1 for connection, and forming a drawing variable-diameter part at the cut part of the inner steel tube 2;
wherein the intercepting length of each layer on the first end is less than that of each layer on the second end;
1.2 A first sleeved steel pipe 5 prepared in advance is sleeved into the inner layer steel pipe 2 from the second end with the length cut out, and the optical fiber 1 is exposed for standby;
1.3 Splicing and secondary coating protection are carried out on the exposed optical fiber 1, and optical fiber attenuation test is carried out on the spliced and coated splicing point, so that the splicing of the optical fiber 1 is completed after the use requirement is met;
1.4 Slightly pushing the first sleeved steel pipe 5 through a splicing point of the optical fiber 1, and sleeving the first sleeved steel pipe 5 outside the splicing point until the first sleeved steel pipe 5 reaches the drawing diameter-changing part of the inner steel pipe 2;
1.5 Respectively welding and protecting the contact points of the two ends of the first sleeved steel pipe 5 and the inner steel pipe 2, and carrying out the optical fiber attenuation test again after welding, wherein the test is qualified, and then completing the connection protection of the inner steel pipe 2.
In the step 1.1), the step of peeling off the encapsulation sheath 4 from the cut first end and the cut second end of the optical cable comprises the following steps:
1.1.1.1 Stripping the packaging sheath 4 by a tool, stripping a first end A of the packaging sheath 4 by a length (for example, 0.5 m), stripping a second end B of the packaging sheath 4 by another length (for example, 2 m), exposing the sheath steel pipe 3 without damaging the packaging sheath 4 as much as possible and leaving the packaging sheath 4 for use, and cleaning oil stains on the surface of the sheath steel pipe 3 by using alcohol to clean the surface of the sheath steel pipe 3;
1.1.1.2 Selecting a second sleeved steel pipe 6 which is made of the same material and has the same wall thickness as the sheath steel pipe 3, wherein the inner diameter of the second sleeved steel pipe 6 is required to be larger than the outer diameter of the sheath steel pipe 3, and the length of the second sleeved steel pipe 6 is between the stripping lengths of the first end and the second end;
preferably, the inner diameter of the second sleeved steel pipe 6 is 1-2 mm larger than the outer diameter of the sheath steel pipe 3; the length of the second jacketed steel pipe 6 is preferably about 1m.
1.1.1.3 Prepared second jacketed steel tube 6 is sleeved into the sheath steel tube 3 from the second end B of the encapsulation sheath 4 stripped by 2m for standby.
In the step 1.1), after the first end and the second end of the cut optical cable are stripped of the packaging sheath 4, the method for stripping the steel tube 3 comprises the following steps:
1.1.2.1 The steel tube 3 at the second end B is circularly cut from a cutting point, the cutting length is less than that of the packaging sheath 4 at the second end B, for example, the steel tube 3 is cut by 1m, the cut steel tube 3 is carefully pulled out of the inner steel tube 2, and the inner steel tube 2 is reserved;
in this embodiment, a special steel pipe cutter is used to perform circular cutting on the sheath steel pipe 3.
1.1.2.2 Repeating the previous step, performing circular cutting on the sheath steel tube 3 at the first end a from the cutting point, wherein the cutting length is less than that of the encapsulation sheath 4 at the first end a, for example, cutting the sheath steel tube 3 by 0.4m, carefully pulling out the cut sheath steel tube 3 from the inner steel tube 2, and keeping the inner steel tube 2;
1.1.2.3 Selecting a first sleeved steel pipe 5 which is made of the same material as the inner steel pipe 2, has the same wall thickness and the same outer diameter for standby, wherein the length of the first sleeved steel pipe 5 is between the intercepting length of the first end A of the sheath steel pipe 3 and the intercepting length of the second end B of the sheath steel pipe 3; in this embodiment, the length of the first socket steel pipe 5 is preferably about 0.5m.
In this embodiment, if there is no suitable steel pipe to be sleeved, a corresponding pipe drawing die may be selected, the end of the inner steel pipe 2 at the second end B is pretreated, and is sleeved into the prepared drawing die, the inner steel pipe 2 is drawn and reduced in diameter by two persons, the processing length is 0.9m, after a plurality of drawing processes, the outer diameter is measured, so that the outer diameter reaches the inner diameter of the first sleeved steel pipe 5, the difference does not exceed a first preset value (preferably, the preset value is 0.05 mm), at this time, drawing is stopped, and the drawing die is removed;
the end of the inner steel pipe 2 at the first end A is preprocessed and sleeved into a prepared drawing die, the inner steel pipe 2 is subjected to drawing and reducing processing in a double-person matching mode, the processing length is 0.3m, the outer diameter is measured after drawing processing for multiple times, the outer diameter is smaller than the inner diameter of the sleeved steel pipe 5, the difference is not larger than a second preset value, (preferably, the second preset value is 1-2 mm, namely, the outer diameter is smaller than 1-2 mm of the inner diameter of the sleeved steel pipe 5), drawing is stopped at the moment, and the drawing die is taken down.
In the step 1.1), after the first end and the second end cut off by the optical cable are sequentially stripped off the packaging sheath 4 and the sheath steel pipe 3, the method for stripping off the inner layer steel pipe 2 comprises the following steps: the inner steel pipe 2 is cut off from the cutting point, the inner steel pipe 2 is cut off, one end of the inner steel pipe 2 is cut off for a first length (for example, 0.3 m), the other end of the inner steel pipe 2 is cut off for a second length (for example, 0.4 m), the cut-off inner steel pipe 2 is carefully pulled out of the optical fiber 1, and the optical fiber 1 is reserved for optical fiber connection.
In this embodiment, a special steel pipe cutter may be used to cut off the inner steel pipe 2.
In the step 2), the inner steel tube 2 is connected, specifically: and lightly pushing the prepared second sleeved steel pipe 6 to the connected first sleeved steel pipe 5 of the inner layer steel pipe 2 to a preset position, performing welding protection on contact points of two ends of the second sleeved steel pipe 6 and the sheath steel pipe 3, performing optical fiber attenuation test again after welding, and completing the connection protection of the sheath steel pipe 3 after the test is qualified.
In the step 3), the sheath steel pipe is continued, specifically: and the materials similar to the packaging sheath 4 are adopted to package and protect the connection part of the sheath steel tube 3, so that the overall size is close to that of the original optical cable packaging sheath 4, the use of matched accessories is not influenced, the optical performance test is finally carried out, the test is qualified, and all connection protection is completed.
In conclusion, the invention can lead the disconnected special high-temperature-resistant optical fiber to be restored and have the integral sensing monitoring function again, the tensile strength is not influenced, the distributed monitoring function is not influenced, in addition, the original armored steel pipe protection measure can better protect the internal optical fiber connection, and the service performance of the integral oil well optical cable is ensured; the connected optical fiber and steel tube optical fiber unit can be used for subsequent production and engineering application, new optical fibers and materials do not need to be purchased again, the oil well optical cable is produced again, the cost is saved, and the waste is reduced.
Besides, the invention can carry out connection protection on the special high-temperature resistant optical fibers with the same model, and can also carry out selective connection and protection on the optical fibers with different models, for example, the invention is applied to the combined application of partially conventional optical fibers and partially special optical fibers, thereby avoiding the embarrassment that the special optical fibers are required to be completely adopted due to the requirement of the special optical fibers, and greatly saving the engineering investment cost.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of splicing a fiber optic downhole cable, comprising:
splicing and coating the optical fiber of the inner layer steel pipe;
continuing the inner layer steel pipe;
and the sheath steel pipe is connected, and the fiber-breaking connection and protection work are realized after the sheath steel pipe connection is finished.
2. The method for splicing an optical cable downhole as claimed in claim 1, wherein the optical cable is composed of an optical fiber, an inner steel tube, a sheath steel tube and a packaging sheath in sequence from inside to outside;
the optical fiber 1 is an optical fiber at 150 ℃ or 300 ℃;
the inner steel pipe is a stainless steel pipe longitudinally welded, the sheath steel pipe is a stainless steel pipe longitudinally welded, and the packaging sheath is made of PP or FEP materials.
3. The method for splicing an optical fiber cable downhole according to claim 1, wherein the splicing and coating of the optical fiber of the inner steel tube comprises:
respectively sequentially stripping the packaging sheath, the sheath steel pipe and the inner steel pipe from the first end and the second end of the cut optical cable, cutting out the optical fiber from the inner steel pipe, pulling out the optical fiber, coating protection, reserving the optical fiber for connection, and enabling the cut part of the inner steel pipe to form a drawing variable-diameter part;
sleeving a first sleeving connection steel pipe prepared in advance into the inner layer steel pipe from the cut second end, and exposing the optical fiber for later use;
the exposed optical fiber is used for connection and secondary coating protection, and the connection and coated connection point is subjected to optical fiber attenuation test, so that the optical fiber connection is completed after the use requirement is met;
slightly pushing the first sleeved steel pipe through the optical fiber splicing point, and sleeving the first sleeved steel pipe outside the splicing point until the first sleeved steel pipe reaches the drawing variable-diameter part of the inner layer steel pipe;
and respectively carrying out welding protection on the two ends of the first sleeving steel pipe and the contact point of the inner steel pipe, carrying out optical fiber attenuation test again after welding, and finishing the continuous protection of the inner steel pipe if the test is qualified.
4. The method of splicing downhole cables of claim 3 wherein the layers on the first end of the cable cut have a cut length less than the cut length of the layers on the second end.
5. The method of splicing fiber optic downhole cables of claim 3, wherein stripping the encapsulating jacket from the first and second ends of the severed cable comprises:
stripping the packaging sheath by using a tool, stripping a section of length from the first end of the packaging sheath, stripping another section of length from the second end of the packaging sheath, exposing the steel tube of the protective layer without damaging the packaging sheath and leaving the packaging sheath for later use, and cleaning oil stain on the surface of the steel tube of the protective layer by using alcohol;
selecting a second sleeved steel pipe which is made of the same material and has the same wall thickness as the sheath steel pipe, wherein the inner diameter of the second sleeved steel pipe is required to be larger than the outer diameter of the sheath steel pipe, and the length of the second sleeved steel pipe is between the stripping lengths of the first end and the second end;
and sleeving the prepared second sleeved steel pipe into the sheath steel pipe from the second end of the packaging sheath for later use.
6. A method of splicing a fiber optic downhole cable as claimed in claim 3, wherein stripping the steel jacket after stripping the encapsulating jacket from the severed first and second ends of the cable comprises:
circularly cutting the sheath steel pipe at the second end from a cutting point, wherein the cutting length is smaller than that of the packaging sheath at the second end, pulling out the cut sheath steel pipe from the inner steel pipe, and keeping the inner steel pipe;
performing circular cutting on the sheath steel pipe at the first end from a cutting point, wherein the cutting length is smaller than that of the packaging sheath at the first end, pulling out the cut sheath steel pipe from the inner layer steel pipe, and keeping the inner layer steel pipe;
and selecting a first sleeved steel pipe which is made of the same material as the inner steel pipe, has the same wall thickness and the same outer diameter for standby, wherein the length of the first sleeved steel pipe is between the intercepting length at the first end of the sheath steel pipe and the intercepting length at the second end of the sheath steel pipe.
7. A method of splicing a fiber optic downhole cable as claimed in claim 3, wherein stripping the steel jacket after stripping the encapsulating jacket from the severed first and second ends of the cable comprises:
selecting a pipe drawing die, preprocessing the end of the inner steel pipe at the second end, sleeving the pipe into the prepared drawing die, performing drawing and reducing treatment on the inner steel pipe, performing drawing treatment for multiple times, measuring the outer diameter to enable the outer diameter to reach the inner diameter of the first sleeved steel pipe, stopping drawing, and taking down the drawing die;
and (3) preprocessing the end of the inner steel pipe at the first end, sleeving the end into a prepared drawing die, performing drawing and reducing treatment on the inner steel pipe, performing drawing treatment for multiple times, measuring the outer diameter to enable the outer diameter to be smaller than the inner diameter of the sleeved steel pipe, enabling the difference to be not more than a second preset value, stopping drawing, and taking down the drawing die.
8. The method for splicing an optical cable downhole as claimed in claim 3, wherein the method for peeling off the inner steel tube after sequentially peeling off the encapsulating sheath and the sheath steel tube from the first end and the second end of the cut optical cable comprises: and respectively cutting off the inner steel pipe from the cutting points, cutting off the first section of length from one end of the inner steel pipe, cutting off the second section of length from the other end of the inner steel pipe, pulling out the cut-off inner steel pipe from the optical fiber, and reserving the optical fiber for optical fiber connection.
9. The method for splicing an optical fiber cable downhole according to claim 1, wherein the splicing of the inner steel tube comprises: and lightly pushing the prepared second sleeved steel pipe to the connected first sleeved steel pipe of the inner layer steel pipe to a preset position, performing welding protection on contact points of two ends of the second sleeved steel pipe and the sheath steel pipe, and performing an optical fiber attenuation test after welding to test the second sleeved steel pipe to be qualified, thereby completing the connection protection of the sheath steel pipe.
10. The method for splicing an optical fiber cable downhole according to claim 1, wherein the splicing of the sheath steel tube comprises: and (3) adopting a material similar to the packaging sheath to package and protect the continuous part of the steel tube of the sheath layer, so that the overall size is close to that of the original optical cable packaging sheath, and the optical performance test is carried out to be qualified and complete the complete continuous protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211505571.1A CN115774303A (en) | 2022-11-29 | 2022-11-29 | Underground optical cable splicing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211505571.1A CN115774303A (en) | 2022-11-29 | 2022-11-29 | Underground optical cable splicing method |
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| CN115774303A true CN115774303A (en) | 2023-03-10 |
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| CN202211505571.1A Pending CN115774303A (en) | 2022-11-29 | 2022-11-29 | Underground optical cable splicing method |
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- 2022-11-29 CN CN202211505571.1A patent/CN115774303A/en active Pending
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