Wiring method for prolonging service life of optical fiber and angle making device thereof

Abstract

The invention discloses a wiring method for prolonging the service life of an optical fiber and an angle making device thereof, and the angle making device is characterized in that one of two splicing parts of an upper protection plate and a lower protection plate is in fixed connection, and the other is in movable connection; oil pipe fixing pieces are arranged at the two ends of the fixedly-spliced position of the upper protection plate and the lower protection plate. Limiting ring clamping grooves are formed in the inner wall of the upper protection plate and the inner wall of the lower protection plate correspondingly, limiting rings are installed in the limiting ring clamping grooves, and limiting nails are arranged on the limiting rings. According to the invention, the elongation of the tubular column after being heated is effectively counteracted, and the optical fiber is prevented from being broken under the action of stress; the optical fiber is more effectively attached to the outer wall of the heat insulation pipe, and friction between the optical fiber and the inner wall of the sleeve in the optical fiber tripping-in process is effectively avoided; the limiting ring can be embedded into the limiting ring clamping groove and can be replaced; the limiting nail on the limiting ring can fix the optical fiber under the action of pulling force, and loses the fixing effect under the action of temperature in the later steam injection process, so that the angle generated by the optical fiber under the action of the pulling force is recovered.

Description

Technical Field

[0001] The invention relates to the technical field of thermal recovery of heavy oil, and in particular to a wiring method and an angle-making device for extending the service life of an optical fiber. Background Art

[0002] During the heavy oil thermal recovery process, the main methods of steam injection pipe string insulation are packer insulation and nitrogen insulation. Nitrogen insulation and packer insulation play a role in reducing wellbore heat loss during the steam injection process. At present, the problem of annular temperature increase caused by heat loss and casing damage is becoming increasingly serious. In order to alleviate the casing damage problem, the research work on annular temperature field testing is particularly prominent. Fiber optic bundling monitoring has been fully utilized as an effective testing method, but during the fiber optic testing process, the steam injection pipe string will have a certain amount of elongation due to the thermal stress of the insulation pipe. After the fiber optic is bundled, its two ends are fixed. Under the action of the pipe string elongation, the optical fiber and the external metal will be stretched, and will be broken when it exceeds its tensile strength. Summary of the invention

[0003] The present invention provides a wiring method and an angle-making device for extending the service life of an optical fiber to ensure that the optical fiber will not be broken due to the elongation of a steam injection pipe column during an optical fiber test.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a wiring method for extending the service life of optical fiber, during the optical fiber downhole operation construction process, the optical fiber is fixed at the coupling position by a coupling protector; during the lowering of the pipe string, an angle-making device is installed in the middle of the insulation tube, and the optical fiber is laterally stretched and positioned along the pipe wall, so that the optical fiber fits the outer wall of the insulation tube and a top angle is generated for the optical fiber, and the insulation tube is lowered to the lower coupling position, and the optical fiber is fixed at the coupling position by the coupling protector, and the position of the optical fiber maintains an axial angle with the previous coupling; it is continuously lowered in this way, and the curve experienced by the optical fiber is finally Z-shaped. The distance extension caused by the angle caused by the Z-shaped wiring of the optical fiber during the wiring process will offset the elongation of the insulation tube during the stretching process after the insulation tube is heated.

[0005] Furthermore, the stretching length of the angle-making device along the radial direction of the heat-insulating pipe can be calculated according to the elongation of the heat-insulating pipe due to heating.

[0006] A corner making device applied to a wiring method comprises an upper guard plate and a lower guard plate, both of which are hollow semi-cylindrical structures, one of the two joints of the upper guard plate and the lower guard plate is a fixed connection and the other is a movable connection; both ends of the fixed joint of the upper guard plate and the lower guard plate are provided with oil pipe fixings; the inner walls of the upper guard plate and the lower guard plate are provided with limit ring grooves, limit rings are installed in the limit ring grooves, and limit nails are provided on the limit rings.

[0007] Furthermore, one end of the outer wall of the lower guard plate is fixed with lower guard plate pin hole one and lower guard plate pin hole two at intervals along the busbar direction, the other end of the outer wall of the lower guard plate is fixed with lower guard plate pin hole three and lower guard plate pin hole four at intervals along the busbar direction, an upper guard plate pin hole one is fixed in the middle of one end of the outer wall of the upper guard plate, and an upper guard plate pin hole two is fixed in the middle of the other end of the outer wall of the upper guard plate; upper guard plate pin hole one is inserted between lower guard plate pin hole one and lower guard plate pin hole two, and are connected by a fixed pin; upper guard plate pin hole two is inserted between lower guard plate pin hole three and lower guard plate pin hole four, and are connected by a movable pin.

[0008] Furthermore, left fixing parts and right fixing parts are fixed at both ends of the fixed joint of the upper guard plate and the lower guard plate.

[0009] Furthermore, two limiting ring grooves are provided on the inner walls of the upper guard plate and the lower guard plate.

[0010] Furthermore, the retaining ring groove and the retaining ring are interference fit.

[0011] Furthermore, each limiting ring is provided with two limiting pins.

[0012] The present invention effectively offsets the elongation of the pipe column after being heated, and avoids the breakage of the optical fiber under the action of stress; the optical fiber and the outer wall of the heat-insulating pipe are more effectively fitted, and the friction between the optical fiber and the inner wall of the casing during the optical fiber lowering process is effectively avoided; the limit ring groove can be embedded in the limit ring and is replaceable; the limit pins on the limit ring can fix the optical fiber under the action of tension, and lose the fixing effect due to the temperature in the later steam injection process, so that the angle of the optical fiber generated under the action of tension is restored. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 This is a schematic diagram of the angle-making device structure. Figure 1 ;

[0015] Figure 2 This is a schematic diagram of the angle-making device structure. Figure 2 ;

[0016] Figure 3 It is the fiber optic cabling design (oil pipe expansion diagram);

[0017] Figure 4 This is the diagram of the changes in the tubing string and optical fiber after steam injection (tubing expansion diagram).

[0018] Among them: 1. Left fixing piece; 2. Fixing pin; 3. Pin hole one of the lower guard plate; 4. Right fixing piece; 5. Pin hole one of the upper guard plate; 6. Limiting ring; 7. Limiting nail; 8. Pin hole two of the lower guard plate; 9. Upper guard plate; 10. Limiting ring slot; 11. Lower guard plate; 12. Movable pin; 13. Pin hole three of the lower guard plate; 14. Pin hole two of the upper guard plate; 15. Pin hole four of the lower guard plate. DETAILED DESCRIPTION

[0019] The following will be combined with the attached Figure 1-4 The technical solution of the present invention is described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The present invention is described in detail below by specific examples, but the protection scope of the present invention is not limited. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can be obtained from commercial channels.

[0021] In the description of the present invention, it should be noted that the terms "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for distinction, and cannot be understood as indicating or implying relative importance.

[0022] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0024] A wiring method for extending the service life of an optical fiber. During the construction process of optical fiber downhole operation, the optical fiber is fixed at a coupling position by a coupling protector. During the process of lowering the pipe column, an angle-making device is installed in the middle of an insulated pipe to laterally stretch and position the optical fiber along the pipe wall, so that the optical fiber fits the outer wall of the insulated pipe and a vertex angle is generated for the optical fiber. The insulated pipe is lowered to the lower coupling position, and the optical fiber is fixed at the coupling position by a coupling protector, and the position of the optical fiber maintains no axial angle with the previous coupling position. The insulated pipe is lowered continuously in this way, and the curve experienced by the optical fiber is finally Z-shaped. The distance extension caused by the angle caused by the Z-shaped wiring of the optical fiber during the wiring process will offset the elongation of the insulated pipe during the stretching process after being heated, thereby protecting the optical fiber from being damaged by stress.

[0025] The invention relates to a method for calculating the thermal elongation of a pipe column, a method for calculating the Z-shaped wiring angle of an optical fiber, and a method for calculating the deformation of a Z-shaped curve of an optical fiber after being subjected to force.

[0026] Calculation method of pipe column thermal elongation: N80 expansion coefficient 12×10 -6 / ℃, 316L stainless steel 10.3×10 -6 / ℃, assuming a temperature difference of 200℃;

[0027] The elongation of the steam injection pipe column is 1000m = 1000m*12×10 -6 / ℃×200℃=2.4m;

[0028] 1000m elongation of optical fiber = 1000m*10.3×10 -6 / ℃×200℃=2.06m;

[0029] The required compensation amount of optical fiber = 0.34m = 340mm;

[0030] Each insulation pipe is designed to be fixed in the middle position around the insulation pipe. The outer diameter (D) of the insulation pipe is 114mm, and the length (L) of the insulation pipe is 10m. In the figure, △S=πD, S=(△S 2 +L 2 ) 1 / 2 , the margin generated by each thermal insulation tube optical fiber = 2S-2L.

[0031] Calculation example:

[0032]

[0033]

[0034] The optical fiber on each insulation tube can provide a margin of 25.62mm through the above wiring method. The required compensation amount for 1000m optical fiber in the whole well is 340mm, and 14 operations of this wiring method need to be evenly set in the panoramic section.

[0035] The Z-shaped optical fiber wiring method combines the calculation of the heat elongation of the pipe column, the calculation of the optical fiber Z-shaped wiring angle, and the calculation of the deformation of the Z-shaped curve after the optical fiber is stressed, so as to effectively offset the elongation of the pipe column after being heated and avoid the breakage of the optical fiber under stress.

[0036] A corner making device applied to a wiring method comprises an upper guard plate 9 and a lower guard plate 11, both of which are hollow semi-cylindrical structures, and one of the two joints of the upper guard plate 9 and the lower guard plate 11 is a fixed connection and the other is a movable connection; both ends of the fixed joint of the upper guard plate 9 and the lower guard plate 11 are provided with oil pipe fixings; the inner walls of the upper guard plate 9 and the lower guard plate 11 are provided with a limit ring groove 10, a limit ring 6 is installed in the limit ring groove 10, and a limit nail 7 is provided on the limit ring 6.

[0037] One end of the outer wall of the lower guard plate 11 is fixed with a lower guard plate pin hole 3 and a lower guard plate pin hole 2 8 at intervals along the busbar direction, the other end of the outer wall of the lower guard plate 11 is fixed with a lower guard plate pin hole 3 13 and a lower guard plate pin hole 4 15 at intervals along the busbar direction, an upper guard plate pin hole 5 is fixed in the middle of one end of the outer wall of the upper guard plate 9, and an upper guard plate pin hole 2 14 is fixed in the middle of the other end of the outer wall of the upper guard plate 9; the upper guard plate pin hole 15 is inserted between the lower guard plate pin hole 3 and the lower guard plate pin hole 2 8, and are connected by a fixed pin 2; the upper guard plate pin hole 2 14 is inserted between the lower guard plate pin hole 3 13 and the lower guard plate pin hole 4 15, and are connected by a movable pin 12.

[0038] The left fixing part 1 and the right fixing part 4 are fixed at both ends of the fixed joint of the upper guard plate 9 and the lower guard plate 11. The inner walls of the upper guard plate 9 and the lower guard plate 11 are provided with two limit ring clamping grooves 10. The limit ring clamping grooves 10 are interference fit with the limit ring 6. Two limit nails 7 are provided on each limit ring 6.

[0039] After the optical fiber is lowered, the fixing part plays a fixing role; the limiting ring groove 10 in the protective plate can be embedded in the limiting ring 6 and is replaceable; the limiting pin 7 on the limiting ring 6 can fix the optical fiber under the action of tension, and loses its fixing effect due to the temperature during the subsequent steam injection process, so that the angle generated by the optical fiber under the action of tension is restored.

[0040] The above-described embodiments are only preferred embodiments of the present invention, and are not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made to it without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention. Although the present invention has been described above with reference to the embodiments, various improvements can be made to it and the components thereof can be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no technical conflict, the various features in the embodiments disclosed in the present invention can be used in combination with each other in any way, and the fact that these combinations are not exhaustively described in this specification is only for the purpose of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A wiring method for extending the service life of an optical fiber, characterized in that: During the fiber optic downhole operation, the optical fiber is fixed at the coupling position by a coupling protector; during the lowering of the pipe string, an angle-making device is installed in the middle of the insulation tube to stretch and position the optical fiber laterally along the tube wall, so that the optical fiber fits the outer wall of the insulation tube and creates a top angle for the optical fiber, and the insulation tube is lowered to the lower coupling position, and the optical fiber is fixed at the coupling position by a coupling protector, and the position of the optical fiber maintains no axial angle with the previous coupling; the optical fiber is continuously lowered in this way, and the curve experienced by the optical fiber is Z-shaped. The distance extension caused by the angle caused by the Z-shaped wiring of the optical fiber during the wiring process will offset the elongation of the insulation tube during the stretching process after being heated.

2. The wiring method for extending the service life of optical fiber according to claim 2, characterized in that: The stretching length of the angle-making device along the radial direction of the heat-insulating pipe can be calculated according to the elongation of the heat-insulating pipe due to heating.

3. An angle-making device applied to the wiring method according to claim 1 or 2, characterized in that: The angle forming device comprises an upper guard plate (9) and a lower guard plate (11), both of which are hollow semi-cylindrical structures. The two joints of the upper guard plate (9) and the lower guard plate (11) are fixedly connected at one end and movablely connected at the other end. Oil pipe fixings are provided at both ends of the fixed joint of the upper guard plate (9) and the lower guard plate (11). The inner walls of the upper guard plate (9) and the lower guard plate (11) are provided with limit ring grooves (10), and limit rings (6) are installed in the limit ring grooves (10), and limit pins (7) are provided on the limit rings (6).

4. The angle-making device according to claim 3, characterized in that: One end of the outer wall of the lower guard plate (11) is fixed with lower guard plate pin hole one (3) and lower guard plate pin hole two (8) at intervals along the busbar direction, and the other end of the outer wall of the lower guard plate (11) is fixed with lower guard plate pin hole three (13) and lower guard plate pin hole four (15) at intervals along the busbar direction; the middle part of one end of the outer wall of the upper guard plate (9) is fixed with upper guard plate pin hole one (5), and the middle part of the other end of the outer wall of the upper guard plate (9) is fixed with upper guard plate pin hole two (14); the upper guard plate pin hole one (5) is inserted between the lower guard plate pin hole one (3) and the lower guard plate pin hole two (8), and is connected by a fixed pin (2); the upper guard plate pin hole two (14) is inserted between the lower guard plate pin hole three (13) and the lower guard plate pin hole four (15), and is connected by a movable pin (12).

5. The angle-making device according to claim 3, characterized in that: A left fixing member (1) and a right fixing member (4) are fixed at both ends of the fixed joint of the upper guard plate (9) and the lower guard plate (11).

6. The angle-making device according to claim 3, characterized in that: The inner walls of the upper guard plate (9) and the lower guard plate (11) are both provided with two limiting ring grooves (10).

7. The angle-making device according to claim 3, characterized in that: The limiting ring groove (10) and the limiting ring (6) are interference fit.

8. The angle-making device according to claim 3, characterized in that: Two limiting pins (7) are arranged on each limiting ring (6).

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