CN114274558A - Special-shaped B-shaped sleeve repairing method for large deformation defect of long oil and gas pipeline - Google Patents
Special-shaped B-shaped sleeve repairing method for large deformation defect of long oil and gas pipeline Download PDFInfo
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Abstract
The invention discloses a method for repairing a special-shaped B-shaped sleeve with a large deformation defect of a long oil and gas transmission pipeline, which comprises the following steps: obtaining a gypsum modeling result; manufacturing a special-shaped B-shaped sleeve according to a drawing of the large deformation defect of the pipeline and the gypsum modeling result; welding the pipe to the position of the large deformation defect of the pipe according to a first preset welding rule; carrying out air tightness detection on the special-shaped B-shaped sleeve; obtaining resin adhesive; injecting the resin adhesive into the special-shaped B-shaped sleeve through the n adhesive injection holes; and injecting the resin glue into the m glue overflowing holes. The method solves the technical problems that in the prior art, the repairing method for the large deformation defect of the pipeline has poor repairing and construction effects on the large deformation defect due to the reasons that the matching precision is poor, the installation specification does not meet the requirements and the like.
Description
Technical Field
The invention relates to the field of pipeline large deformation defect repair, in particular to a method for repairing a special-shaped B-shaped sleeve with a large deformation defect of a long oil and gas transmission pipeline.
Background
The long-distance oil and gas pipeline has wide passing region and complex geological appearance. Due to external force action such as geological movement and flood scouring, the pipeline can be subjected to large deformation defects such as sinking, wrinkling and overlarge ovality. The defects of large deformation of the pipeline, such as oblique connection, misalignment and the like of the pipeline caused by irregular welding, irregular operation of mechanical equipment and the like in the pipeline laying operation process, are also overcome. The large deformation defects of excessive bending deformation, oblique connection of pipelines and the like not only can cause the pipe wall to break, but also can cause the pipelines to generate plastic deformation, thereby reducing the strength of the pipelines and also causing the buckling failure of the pipe body under certain conditions. At present, the repair standard for the large deformation defect of the pipeline at home and abroad is less. In the design specification of the operation of part of long-distance pipelines, the suggested repair mode aiming at the pipeline with ovality of more than 2.5 percent and obvious bending wrinkles only adopts a tube replacement technology. The method for optimizing the repair of the large deformation defect of the pipeline is researched and designed, and has important practical significance.
However, in the prior art, the repair construction effect on the large deformation defect is not good due to the reasons that the matching precision of the repair method for the large deformation defect of the pipeline is poor, the installation specification does not meet the requirement and the like.
Disclosure of Invention
The method aims to solve the technical problem that in the prior art, due to the facts that the matching precision of the method for repairing the large deformation defect of the pipeline is poor, the installation specification is not satisfactory and the like, the repairing effect on the large deformation defect is poor. The construction operation is simple and convenient, and the applicability is strong; the special-shaped B-shaped sleeve can be adapted to most of large deformation defects and has a strong repairing effect; the glue injection filling process can uniformly disperse and transmit the stress concentration at the defect to the sleeve through the filling glue, so that the stress concentration at the defect is reduced, and the bearing capacity is improved; meanwhile, a novel efficient technical means is provided for the technical field of repairing large deformation defects of the existing long-distance oil and gas pipelines, partial technical blanks are filled, and the technical effect of continuous repairing construction operation of the large deformation defects of the pipelines in service is achieved.
The application provides a method for repairing a special-shaped B-shaped sleeve with a large deformation defect of a long oil and gas transmission pipeline, wherein the method comprises the following steps: s100: modeling the original size of the large deformation defect of the pipeline in a gypsum pasting mode to obtain a gypsum modeling result; s200: manufacturing a special-shaped B-shaped sleeve through a drawing of the large deformation defect of the pipeline and the gypsum modeling result, wherein the special-shaped B-shaped sleeve is provided with n glue injection holes and m glue overflow holes, and the n glue injection holes and the m glue overflow holes are provided with screw plugs; s300: welding the special-shaped B-shaped sleeve to the position of the pipeline large deformation defect according to a first preset welding rule; s400: carrying out air tightness detection on the special-shaped B-shaped sleeve to obtain a first detection result; s500: stirring and mixing an epoxy resin main agent, an epoxy auxiliary material, an epoxy curing agent and a diluent to obtain a resin adhesive; s600: the pipe plugs of the m glue overflow holes are all opened, the resin glue is injected into the special-shaped B-shaped sleeve through the n glue injection holes, and when each glue overflow in the m glue overflow holes meets a first preset requirement, the pipe plugs of the n glue injection holes are closed; s700: and injecting the resin glue into the m glue overflow holes, and closing the screw plugs of the m glue overflow holes after waiting for preset time.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
obtaining a gypsum modeling result through gypsum pasting; manufacturing a special-shaped B-shaped sleeve according to a drawing of a large deformation defect of the pipeline and a gypsum modeling result; welding the pipe to the position of the large deformation defect of the pipe according to a first preset welding rule; carrying out air tightness detection on the special-shaped B-shaped sleeve; obtaining resin adhesive; injecting resin glue into the special-shaped B-shaped sleeve through the glue injection hole; and injecting resin glue into the glue overflow hole. The construction operation is simple and convenient, and the applicability is strong; the special-shaped B-shaped sleeve can be adapted to most of large deformation defects and has a strong repairing effect; the glue injection filling process can uniformly disperse and transmit the stress concentration at the defect to the sleeve through the filling glue, so that the stress concentration at the defect is reduced, and the bearing capacity is improved; meanwhile, a novel efficient technical means is provided for the technical field of repairing large deformation defects of the existing long-distance oil and gas pipelines, partial technical blanks are filled, and the technical effect of continuous repairing construction operation of the large deformation defects of the pipelines in service is achieved.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic flow chart of a method for repairing a special-shaped B-shaped sleeve with a large deformation defect of a long oil and gas pipeline according to the application;
FIG. 2 is a structural diagram of repairing a special-shaped B-shaped sleeve of a pipeline in the method for repairing the special-shaped B-shaped sleeve with the large deformation defect of the long oil and gas pipeline;
FIG. 3 is a schematic diagram of the final installation effect of the method for repairing the special-shaped B-shaped sleeve with the large deformation defect of the long oil and gas pipeline.
Detailed Description
The method for repairing the special-shaped B-shaped sleeve with the large deformation defect of the long oil and gas pipeline solves the technical problem that in the prior art, the repair construction effect on the large deformation defect is poor due to the reasons that the matching precision of the repair method with the large deformation defect of the pipeline is poor, the installation specification is not in accordance with the requirements and the like. The construction operation is simple and convenient, and the applicability is strong; the special-shaped B-shaped sleeve can be adapted to most of large deformation defects and has a strong repairing effect; the glue injection filling process can uniformly disperse and transmit the stress concentration at the defect to the sleeve through the filling glue, so that the stress concentration at the defect is reduced, and the bearing capacity is improved; meanwhile, a novel efficient technical means is provided for the technical field of repairing large deformation defects of the existing long-distance oil and gas pipelines, partial technical blanks are filled, and the technical effect of continuous repairing construction operation of the large deformation defects of the pipelines in service is achieved.
Hereinafter, example embodiments according to the present application will be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are merely some embodiments of the present application and not all embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein.
The long-distance oil and gas pipeline has wide passing region and complex geological appearance. Due to external force action such as geological movement and flood scouring, the pipeline can be subjected to large deformation defects such as sinking, wrinkling and overlarge ovality. The defects of large deformation of the pipeline, such as oblique connection, misalignment and the like of the pipeline caused by irregular welding, irregular operation of mechanical equipment and the like in the pipeline laying operation process, are also overcome. The large deformation defects of excessive bending deformation, oblique connection of pipelines and the like not only can cause the pipe wall to break, but also can cause the pipelines to generate plastic deformation, thereby reducing the strength of the pipelines and also causing the buckling failure of the pipe body under certain conditions. At present, the repair standard for the large deformation defect of the pipeline at home and abroad is less. In the design specification of the operation of part of long-distance pipelines, the suggested repair mode aiming at the pipeline with ovality of more than 2.5 percent and obvious bending wrinkles only adopts a tube replacement technology. The method for optimizing the repair of the large deformation defect of the pipeline is researched and designed, and has important practical significance.
In view of the above technical problems, the technical solution provided by the present application has the following general idea:
the application provides a method for repairing a special-shaped B-shaped sleeve with a large deformation defect of a long oil and gas transmission pipeline, wherein the method comprises the following steps: obtaining a gypsum modeling result through gypsum pasting; manufacturing a special-shaped B-shaped sleeve according to a drawing of a large deformation defect of the pipeline and a gypsum modeling result; welding the pipe to the position of the large deformation defect of the pipe according to a first preset welding rule; carrying out air tightness detection on the special-shaped B-shaped sleeve; obtaining resin adhesive; injecting resin glue into the special-shaped B-shaped sleeve through the glue injection hole; and injecting resin glue into the glue overflow hole.
For better understanding of the above technical solutions, the following detailed descriptions will be provided in conjunction with the drawings and the detailed description of the embodiments.
Example one
As shown in fig. 1, the application provides a method for repairing a special-shaped B-shaped sleeve with a large deformation defect of a long oil and gas pipeline, wherein the method comprises the following steps:
s100: modeling the original size of the large deformation defect of the pipeline in a gypsum pasting mode to obtain a gypsum modeling result;
specifically, the gypsum pasting mode is that calcium sulfate hemihydrate with an alpha-type structure and water are mixed and dissolved according to a proper proportion, then the mixture is coated on the surface of a pipeline, and after the gypsum is solidified, the gypsum is cut off, so that the gypsum modeling result is obtained. The large deformation defects of the pipeline comprise deformation defects which affect the overall strength and integrity characteristics of the pipeline and are formed by oblique connection of the pipeline, butt joint and misalignment of the pipeline, sinking, bulging, wrinkling and ovality of more than 1.5% -2.5%. To give an example without limitation: the target defects to be repaired are pipelines made of OD720 multiplied by 6.7mm and X60 materials, the pipelines are subjected to comprehensive influences of non-compliance of welding process, geological movement and the like, the problems of oblique joint and folding occur, the oblique joint angle is 12 degrees, and the folding plastic deformation of about 7mm exists at the circumferential weld. According to basic parameters of the pipeline to be repaired such as pipe diameter, material, welding seam trend, pressure, flow velocity and the like, the environmental characteristics and the geological conditions of the soil in the buried depth of the pipeline are analyzed, and the demonstration analysis is performed mainly aiming at the characteristics of the large deformation defect of the pipeline. The original dimension modeling of the large deformation defect of the pipeline is carried out by using the modes of manual dimension measurement, computer 3D scanning and gypsum pasting, the gypsum modeling result is obtained, and a foundation is laid for manufacturing the special-shaped B-shaped sleeve.
S200: manufacturing a special-shaped B-shaped sleeve through a drawing of the large deformation defect of the pipeline and the gypsum modeling result, wherein the special-shaped B-shaped sleeve is provided with n glue injection holes and m glue overflow holes, and the n glue injection holes and the m glue overflow holes are provided with screw plugs;
further, step S200 of the present application further includes:
s210: the special-shaped B-shaped sleeve is of an integrated reducing five-section structure, the minimum thickness of a base body of the wall of the special-shaped B-shaped sleeve is 1.0-1.5 times of the thickness of the pipe wall of the pipeline, n glue injection holes are formed below the special-shaped B-shaped sleeve, n is a positive integer larger than or equal to 1, m glue overflow holes are formed above the special-shaped B-shaped sleeve, and m is a positive integer larger than or equal to 1;
s220: the special-shaped B-shaped sleeve is of an integrated reducing structure and is of a five-section structure at least, and the ratio of the section with the largest axial length to the section with the smallest axial length is 2:1-3: 1.
Specifically, the special-shaped B-shaped sleeve is manufactured by machining, forging, casting and the like by using manual drawings, computer modeling and gypsum modeling as prototypes. The special-shaped B-shaped sleeve is of an integrated reducing structure, the whole length is designed according to the table 1, and the special-shaped B-shaped sleeve is of a five-section structure at least. As shown in figure 2, the center of the pumpkin-shaped structure in the middle is symmetrical, and two or more sections of structures with the same diameter or variable diameter structures are arranged at two ends of the pumpkin-shaped structure. The thickness (minimum thickness) of the sleeve base body is 1.0-1.5 times of the thickness of the pipe wall, and the maximum thickness of the reducing connection part can be increased to 2 times of the thickness of the sleeve base body. And n glue injection holes are formed in the 6-point direction of the sleeve, namely n glue injection holes are formed below the special-shaped B-shaped sleeve. And m glue overflow holes are formed in the 12-point direction, namely m glue overflow holes are formed above the special-shaped B-shaped sleeve. The glue injection hole and the glue overflow hole are both provided with steel pipe plugs. Wherein n is a positive integer greater than or equal to 1, and m is a positive integer greater than or equal to 1. The number and the aperture of the glue injection holes and the glue overflow holes are determined according to the size of the inner gap of the special-shaped sleeve, and are shown in table 1. The axial length of each segment should be guaranteed to be the same or float in the range of 50% -150%, i.e. the ratio of the segment with the largest axial length to the segment with the smallest axial length is between 2:1 and 3: 1. And the special-shaped B-shaped sleeve is manufactured, so that the special-shaped B-shaped sleeve is convenient to weld to the position of the large deformation defect of the pipeline in the follow-up process.
TABLE 1 opening size of glue injection hole and glue overflow hole and sleeve length
S300: welding the special-shaped B-shaped sleeve to the position of the pipeline large deformation defect according to a first preset welding rule;
further, step S300 of the present application further includes:
s310: acquiring pipeline information according to the large deformation defect of the pipeline;
s320: and acquiring a welding process rule based on the pipeline information, and sequentially welding from one end of the special-shaped B-shaped sleeve to the other end according to the sequence of the longitudinal weld and the circular fillet weld based on the welding process rule.
Specifically, the special-shaped B-shaped sleeve is welded to the position of the pipeline large deformation defect according to a first preset welding rule. And the first preset welding rule is that according to a welding process rule obtained from pipeline information, welding is carried out from one end of the special-shaped B-shaped sleeve to the other end in sequence according to the sequence of a longitudinal welding line and a circular fillet welding line. The pipeline information comprises basic information such as pipe diameter, material, pressure, flow velocity, temperature, humidity and the like. The welding process procedures comprise welding methods, pre-welding preparation processing, assembly, welding materials, welding equipment, welding sequences, welding operations, welding process parameters, post-welding treatment and the like. And scientifically welding the special-shaped B-shaped sleeve according to a first preset welding rule.
S400: carrying out air tightness detection on the special-shaped B-shaped sleeve to obtain a first detection result;
further, step S400 of the present application further includes:
s410: opening the m glue overflow hole plug, connecting the n glue injection holes through the fast-insertion threaded connectors matched with the n glue injection holes and the air pipes, and cleaning foreign matters according to the connection result;
s420: and after the foreign matter is cleaned, sealing the m glue overflow holes through the pipe plugs, and performing air tightness test through compressed air of 0.4-0.6 MPa.
Specifically, after the special-shaped B-shaped sleeve is welded to the position of the pipeline large deformation defect, the air tightness of the special-shaped B-shaped sleeve needs to be detected through a first detection result. The first detection result indicates whether air leakage exists at each sealing part of the special-shaped B-shaped sleeve and at the sleeve welding position. And unscrewing the m glue overflow hole screw plugs, and arranging air pipes and quick-inserting threaded joints according to the aperture of the n glue injection holes. And cleaning foreign matters such as scrap iron, impurities, dust and the like generated in the n glue injection holes due to welding repair by using compressed air. And further, screwing the n glue injection holes and connecting an air pipe. And detecting the n glue injection holes to ensure that the glue injection holes are smooth and have no blockage. And sealing the n glue injection holes, performing a pressurizing test by adopting 0.4-0.6 MPa compressed air, and detecting whether each sealing part and the sleeve welding position leak gas or not by using soapy water. The air tightness of the special-shaped B-shaped sleeve is detected, and a foundation is laid for a subsequent glue injection filling process.
S500: stirring and mixing an epoxy resin main agent, an epoxy auxiliary material, an epoxy curing agent and a diluent to obtain a resin adhesive;
further, step S500 of the present application further includes:
s510: mixing an epoxy resin main agent, an epoxy auxiliary material, an epoxy curing agent and a diluent according to a ratio of 100: 10-15: blending at a mass ratio of 25-35:20-25, stirring and mixing at a speed of 200rad/min or below, and then placing into a forced air drying oven at 50-70 ℃ for curing for 18-22 min to obtain the resin adhesive.
S520: the epoxy resin main agent is one of F51, F48 and F44, the epoxy auxiliary material is prepared by compounding E51 and KH560 coupling agents according to the mass ratio of 19:1, the epoxy curing agent is compounded by 593 and 651 according to the mass ratio of 1:1, and the diluent is one of 501 and 1828.
Specifically, the epoxy resin is prepared by mixing an epoxy resin main agent, an epoxy auxiliary material, an epoxy curing agent and a diluent according to the ratio of 100: 10-15: blending at a mass ratio of 25-35:20-25, stirring and mixing at a speed of not more than 200rad/min, and curing in a forced air drying oven to obtain the resin adhesive. Wherein the epoxy resin main agent can be one of F51, F48 and F44; compounding the E51 and KH560 coupling agent according to the mass ratio of 19:1 to obtain the epoxy auxiliary material; the epoxy curing agent is compounded by 593 and 651 according to the mass ratio of 1: 1; the diluent is one of 501 and 1828. The temperature of the forced air drying oven is preferably 50 ℃ to 70 ℃. The curing time is adjusted according to the different quality of the raw materials, and is preferably 18min-22 min. For example, 20Kg of epoxy resin as a main agent F51, 1.9Kg of an epoxy auxiliary material prepared from E51 and 0.1Kg of KH560 as coupling agents, 2.5Kg of a curing agent 593 and 2.5Kg of a curing agent 651, and 4Kg of a diluent 501 were blended, stirred and mixed at a speed of 180rad/min, and then put into a 60 ℃ forced air drying oven to be cured for 20min, thereby preparing a resin adhesive.
S600: the pipe plugs of the m glue overflow holes are all opened, the resin glue is injected into the special-shaped B-shaped sleeve through the n glue injection holes, and when each glue overflow in the m glue overflow holes meets a first preset requirement, the pipe plugs of the n glue injection holes are closed;
further, step S600 of the present application further includes:
s610: opening all the plugs of the m glue overflow holes, and injecting the cured resin glue into the special-shaped B-shaped sleeve by using a pneumatic glue injection device of 0.7-0.9 MPa through the n glue injection holes;
s620: and when at least 40ml of glue overflows from each glue overflow hole in the m glue overflow holes, closing the plug of the n glue injection holes.
Specifically, after the resin glue is obtained, the plugs of the m glue overflow holes are all opened, cured resin glue is quickly injected into the special-shaped B-shaped sleeve through the n glue injection holes by using a pneumatic glue injection device of 0.7-0.9 MPa, and the plugs of the n glue injection holes are closed when a first preset requirement is met. Wherein the first predetermined requirement is that when at least 40ml of glue overflows from each glue overflow hole in the m glue overflow holes, the plug of the n glue injection holes is closed. For example, the plug of all glue overflow holes is opened, cured resin glue is taken out, and the cured resin glue is quickly injected into the special-shaped B-shaped sleeve through the glue injection holes by using a 0.8MPa pneumatic glue injection device until 50ml of glue overflows from all the glue overflow holes.
S700: and injecting the resin glue into the m glue overflow holes, and closing the screw plugs of the m glue overflow holes after waiting for preset time.
Further, step S700 of the present application further includes:
s710: and injecting the resin glue into the m glue overflow holes, waiting for at least 2 hours, removing the glue blocks of the m glue overflow holes, and closing the screw plugs of the m glue overflow holes.
Specifically, the resin adhesive is injected through the m adhesive overflow holes, after the preset time, the adhesive blocks of the m adhesive overflow holes are removed, and the screw plugs of the m adhesive overflow holes are closed. Wherein the predetermined time is at least 2 h. For example, a quick-plug threaded connector of the glue injection hole is taken out, and after the plug is screwed on, partial resin glue is injected into the glue overflow hole again by a manual method so as to fill up partial glue lost during the plugging of the glue injection hole. And after waiting for 2 hours, removing the rubber blocks of the rubber overflow holes by using a wallpaper knife and an iron shovel, and screwing the plug. Namely, the repair construction operations such as welding the sleeve, injecting glue, filling and the like are completed. The final installation effect is schematically shown in fig. 3. The glue injection filling process can uniformly disperse and transmit the stress concentration of the defect to the sleeve through the filling glue, so that the stress concentration of the defect is reduced, and the bearing capacity is improved.
Compared with the prior art, the invention has the following beneficial effects:
1. obtaining a gypsum modeling result through gypsum pasting; manufacturing a special-shaped B-shaped sleeve according to a drawing of a large deformation defect of the pipeline and a gypsum modeling result; welding the pipe to the position of the large deformation defect of the pipe according to a first preset welding rule; carrying out air tightness detection on the special-shaped B-shaped sleeve; obtaining resin adhesive; injecting resin glue into the special-shaped B-shaped sleeve through the glue injection hole; and injecting resin glue into the glue overflow hole. The construction operation is simple and convenient, and the applicability is strong; the special-shaped B-shaped sleeve can be adapted to most of large deformation defects and has a strong repairing effect; the glue injection filling process can uniformly disperse and transmit the stress concentration at the defect to the sleeve through the filling glue, so that the stress concentration at the defect is reduced, and the bearing capacity is improved; meanwhile, a novel efficient technical means is provided for the technical field of repairing large deformation defects of the existing long-distance oil and gas pipelines, partial technical blanks are filled, and the technical effect of continuous repairing construction operation of the large deformation defects of the pipelines in service is achieved.
2. According to basic parameters of the pipeline to be repaired such as pipe diameter, material, welding seam trend, pressure, flow velocity and the like, the environmental characteristics and the geological conditions of the soil in the buried depth of the pipeline are analyzed, and the demonstration analysis is performed mainly aiming at the characteristics of the large deformation defect of the pipeline. And performing original size modeling on the large deformation defect of the pipeline by using a manual size measurement mode, a computer 3D scanning mode and a gypsum pasting mode.
Example two
In order to verify the actual using effect of the invention, in 11 months in 2019, the on-site repairing application is carried out on a certain crude oil pipeline in the northeast oil transportation official network of a certain pipeline company.
The pipeline is made of OD720 multiplied by 6.7mm and X60 materials, the pipeline is subjected to the comprehensive influences of non-compliance of a welding process, geological motion and the like, and is subjected to oblique joint and corrugation problems, the oblique joint angle is 12 degrees, and the position of a circumferential weld has corrugation plastic deformation of about 7 mm.
The concrete construction process is as follows:
the method comprises the following steps: and (6) modeling. Determining basic parameters of the pipeline to be repaired such as pipe diameter, material, welding seam trend, pressure, flow velocity and the like, analyzing the environmental characteristics of soil buried depth of the pipeline and the conditions of the ground objects, performing demonstration analysis on the characteristics of the large deformation defect of the pipeline, and performing original size modeling on the large deformation defect of the pipeline by using a manual size measurement mode, a computer 3D scanning mode and a gypsum pasting mode;
step two: and (5) manufacturing a sleeve. The special-shaped B-shaped sleeve is manufactured by using a manual drawing and gypsum modeling as a prototype and by means of machine tool machining, forging, casting and the like. The special-shaped B-shaped sleeve is of an integrated reducing five-section structure, the whole length is 1000mm, the axial length of the pumpkin-shaped structure is 300mm, the maximum radius is 900mm (shown in figure 2), the material is X65 tubular steel, and the thickness (minimum thickness) of a sleeve wall substrate is 12 mm. 2 glue injection holes of M9.0 x 1.25 are formed in the direction of 6 points of the sleeve, 3 glue overflow holes of M9.0 x 1.25 are formed in the direction of 12 points of the sleeve, and the glue injection holes and the glue overflow holes are provided with steel screw plugs;
step three: and (7) welding and repairing. Welding according to the welding process procedure of the B-shaped sleeve of the pipeline, wherein the welding sequence is that one end is welded to the other end in sequence according to the sequence of a longitudinal welding seam and a circular fillet welding seam;
step four: the airtightness was checked. Unscrewing the rubber overflow hole plug, arranging an air pipe and a quick-plugging threaded connector according to the aperture of the rubber injection hole, cleaning scrap iron, impurity dust and the like generated in the rubber injection hole due to welding repair by using compressed air, winding the PTFE tape on the quick-plugging threaded connector, screwing the rubber injection hole, and connecting the transparent PU air pipe. And all glue injection holes are detected to ensure smooth and non-blocking. Sealing all the glue injection holes, adopting 0.4MPa compressed air to carry out a pressurizing test, and using soapy water to detect whether each sealing part and the sleeve welding position leak air or not;
step five: and (5) preparing glue. Blending 20Kg of epoxy resin F51, 1.9Kg of epoxy resin E51, 0.1Kg of KH560 coupling agent, 2.5Kg of curing agent 593, 2.5Kg of curing agent 651 and 4Kg of diluent 501, stirring and mixing at the speed of 180rad/min, and then putting into an air drying oven at 60 ℃ for curing for 20 min;
step six: and (4) opening all the rubber overflow hole plugs, taking out the cured resin rubber in the step five, and quickly injecting the cured resin rubber into the special-shaped B-shaped sleeve through the rubber injection holes by using a 0.8MPa pneumatic rubber injection device until at least 50ml of rubber overflows from all the rubber overflow holes. And taking the quick-insertion threaded connector of the glue pouring hole, screwing the plug, and then manually injecting part of resin glue into the glue overflow hole again to fill part of glue lost during the plugging of the glue injection hole. After waiting for 2h, a wallpaper knife and an iron shovel are used for shoveling off the rubber blocks of the rubber overflow holes, and the plug is screwed on. Namely, the repair construction operations such as welding the sleeve, injecting glue, filling and the like are completed. The final installation effect is schematically shown in fig. 3.
The embodiment adopts the method for repairing the special-shaped B-shaped sleeve with the large deformation defect of the long oil and gas transmission pipeline, and has the advantages of simple and convenient construction operation and strong applicability. The special-shaped B-shaped sleeve can be adapted to most of large deformation defects and has a strong repairing and reinforcing effect; the glue injection filling process can uniformly disperse and transmit the stress concentration of the defect to the sleeve through the filling glue, so that the stress concentration of the defect is reduced, and the bearing capacity is improved. The invention can provide a novel and efficient technical means for the technical field of repairing the large deformation defects of the existing long-distance oil and gas pipelines, fills partial technical blank, and realizes the construction operation of repairing the large deformation defects of the pipelines without stopping transportation in service.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the present invention and its equivalent technology, it is intended that the present invention also include such modifications and variations.
Claims (9)
1. A method for repairing a special-shaped B-shaped sleeve with a large deformation defect of a long oil and gas pipeline is characterized by comprising the following steps:
s100: modeling the original size of the large deformation defect of the pipeline in a gypsum pasting mode to obtain a gypsum modeling result;
s200: manufacturing a special-shaped B-shaped sleeve through a drawing of the large deformation defect of the pipeline and the gypsum modeling result, wherein the special-shaped B-shaped sleeve is provided with n glue injection holes and m glue overflow holes, and the n glue injection holes and the m glue overflow holes are provided with screw plugs;
s300: welding the special-shaped B-shaped sleeve to the position of the pipeline large deformation defect according to a first preset welding rule;
s400: carrying out air tightness detection on the special-shaped B-shaped sleeve to obtain a first detection result;
s500: stirring and mixing an epoxy resin main agent, an epoxy auxiliary material, an epoxy curing agent and a diluent to obtain a resin adhesive;
s600: the pipe plugs of the m glue overflow holes are all opened, the resin glue is injected into the special-shaped B-shaped sleeve through the n glue injection holes, and when each glue overflow in the m glue overflow holes meets a first preset requirement, the pipe plugs of the n glue injection holes are closed;
s700: and injecting the resin glue into the m glue overflow holes, and closing the screw plugs of the m glue overflow holes after waiting for preset time.
2. The method of claim 1, wherein the special-shaped B-shaped sleeve is of an integral reducing five-section structure, the minimum thickness of a base body of the wall of the special-shaped B-shaped sleeve is 1.0-1.5 times of the thickness of the pipe wall of the pipeline, n glue injection holes are formed below the special-shaped B-shaped sleeve, n is a positive integer larger than or equal to 1, m glue overflow holes are formed above the special-shaped B-shaped sleeve, and m is a positive integer larger than or equal to 1.
3. The method of claim 1, wherein the S300 further comprises:
acquiring pipeline information according to the large deformation defect of the pipeline;
and acquiring a welding process rule based on the pipeline information, and sequentially welding from one end of the special-shaped B-shaped sleeve to the other end according to the sequence of the longitudinal weld and the circular fillet weld based on the welding process rule.
4. The method of claim 1, wherein the S400 further comprises:
opening the m glue overflow hole plug, connecting the n glue injection holes through the fast-insertion threaded connectors matched with the n glue injection holes and the air pipes, and cleaning foreign matters according to the connection result;
and after the foreign matter is cleaned, sealing the m glue overflow holes through the pipe plugs, and performing air tightness test through compressed air of 0.4-0.6 MPa.
5. The method of claim 1, wherein the S500 further comprises:
mixing an epoxy resin main agent, an epoxy auxiliary material, an epoxy curing agent and a diluent according to a ratio of 100: 10-15: blending at a mass ratio of 25-35:20-25, stirring and mixing at a speed of 200rad/min or below, and then placing into a forced air drying oven at 50-70 ℃ for curing for 18-22 min to obtain the resin adhesive.
6. The method of claim 5, wherein the S600 further comprises:
opening all the plugs of the m glue overflow holes, and injecting the cured resin glue into the special-shaped B-shaped sleeve by using a pneumatic glue injection device of 0.7-0.9 MPa through the n glue injection holes;
and when at least 40ml of glue overflows from each glue overflow hole in the m glue overflow holes, closing the plug of the n glue injection holes.
7. The method of claim 1, wherein the S700 further comprises:
and injecting the resin glue into the m glue overflow holes, waiting for at least 2 hours, removing the glue blocks of the m glue overflow holes, and closing the screw plugs of the m glue overflow holes.
8. The method of claim 1, wherein the special-shaped B-shaped sleeve is of a one-piece reducing structure and is of a five-segment structure, and the ratio of the segment with the largest axial length to the segment with the smallest axial length is 2:1-3: 1.
9. The method of claim 5, wherein the main epoxy resin agent is one of F51, F48 and F44, the auxiliary epoxy material is E51 and KH560 coupling agent compounded according to a mass ratio of 19:1, the epoxy curing agent is 593 and 651 are compounded according to a mass ratio of 1:1, and the diluent is one of 501 and 1828.
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| CN202111621713.6A CN114274558A (en) | 2021-12-28 | 2021-12-28 | Special-shaped B-shaped sleeve repairing method for large deformation defect of long oil and gas pipeline |
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| CN202111621713.6A CN114274558A (en) | 2021-12-28 | 2021-12-28 | Special-shaped B-shaped sleeve repairing method for large deformation defect of long oil and gas pipeline |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060065320A1 (en) * | 2004-09-29 | 2006-03-30 | Borland Robin N | Pipeline repair system and method of installation |
| CN101204770A (en) * | 2007-01-15 | 2008-06-25 | 北京安科管道工程科技有限公司 | Pressure structure clamp and fiber compound material combination expander technology |
| CN106145766A (en) * | 2015-04-26 | 2016-11-23 | 上海易瓷纳米科技有限公司 | A kind of material repairing pottery porcelain body |
| CN109000083A (en) * | 2017-06-07 | 2018-12-14 | 中国石油天然气股份有限公司 | A kind of method of epoxy sleeve pipe-repairing |
| CN110762332A (en) * | 2019-09-26 | 2020-02-07 | 中国石油天然气集团有限公司 | Device and process for repairing pipeline girth weld defects by using epoxy steel sleeve |
| CN213840041U (en) * | 2020-12-14 | 2021-07-30 | 沈阳圣凯龙输油管道技术服务有限责任公司 | B-type sleeve for repairing circumferential weld defects of oil and gas pipelines |
-
2021
- 2021-12-28 CN CN202111621713.6A patent/CN114274558A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060065320A1 (en) * | 2004-09-29 | 2006-03-30 | Borland Robin N | Pipeline repair system and method of installation |
| CN101204770A (en) * | 2007-01-15 | 2008-06-25 | 北京安科管道工程科技有限公司 | Pressure structure clamp and fiber compound material combination expander technology |
| CN106145766A (en) * | 2015-04-26 | 2016-11-23 | 上海易瓷纳米科技有限公司 | A kind of material repairing pottery porcelain body |
| CN109000083A (en) * | 2017-06-07 | 2018-12-14 | 中国石油天然气股份有限公司 | A kind of method of epoxy sleeve pipe-repairing |
| CN110762332A (en) * | 2019-09-26 | 2020-02-07 | 中国石油天然气集团有限公司 | Device and process for repairing pipeline girth weld defects by using epoxy steel sleeve |
| CN213840041U (en) * | 2020-12-14 | 2021-07-30 | 沈阳圣凯龙输油管道技术服务有限责任公司 | B-type sleeve for repairing circumferential weld defects of oil and gas pipelines |
Non-Patent Citations (1)
| Title |
|---|
| 程训义等: "《建筑安装工程焊接实用手册》", 中国建筑工业出版社, pages: 626 * |
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