CN114909542A - A device and method for repairing defects in oil and gas pipelines - Google Patents

Abstract

The invention relates to an oil and gas pipeline defect repairing device and method, and belongs to the technical field of pipeline defect repairing. An oil and gas pipeline defect repairing device, comprising: two semi-cylindrical cylinders, the upper part and the lower part of the two semi-cylindrical cylinders are connected by detachable connectors to form a cylindrical repairing cylinder, and a ring-shaped repairing cylinder is arranged in the repairing cylinder weld groove. Beneficial effects: the defective position of the pipe body can be quickly wrapped, and the repairing cylinder can be installed by means of detachable connection, which can improve work efficiency.

Description

A device and method for repairing defects in oil and gas pipelines

technical field

The invention belongs to the technical field of pipeline defect repair, and in particular relates to an oil and gas pipeline defect repair device and method.

Background technique

Pipeline transportation is one of the most economical, convenient and most important transportation methods for oil and natural gas. It has an extremely important strategic position and is widely used in industrial, civil and other fields. It is known as the lifeline of the national economy. Currently, there are about 140,000 kilometers of oil and gas pipelines in service in China. , Pipe materials and construction quality and other reasons lead to pipeline failure accidents, which will cause fires and explosions, which will cause huge economic losses, casualties and environmental pollution and other catastrophic consequences, which seriously affect the smooth operation of the social economy and endanger the People's life safety, in order to avoid more pipeline accidents, the defects found in the daily maintenance process of the pipeline should be dealt with or repaired in time, and the existing pipeline repairs use the method of welding seam, the safety of the construction process is not high. high, the repair takes a long time.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides an oil and gas pipeline defect repairing device, which can quickly wrap the defect position of the pipe body, and install the repairing cylinder in a detachable connection manner, which can improve work efficiency.

The technical solution of the present invention to solve the above technical problems is as follows: The oil and gas pipeline defect repair device includes: two semi-cylindrical cylinders, the upper and lower parts of the two semi-cylindrical cylinders are connected by detachable connectors to form a cylindrical repair The repairing cylinder is provided with an annular weld groove.

Beneficial effects: the defective position of the pipe body can be quickly wrapped, and the repairing cylinder can be installed by means of detachable connection, which can improve work efficiency.

On the basis of the above technical solutions, the present invention can also be improved as follows.

Further, the detachable connector is a hinge or a snap or friction surface connector or a bolt.

The beneficial effect of adopting the above-mentioned further scheme is that various connection modes can be selected, the upper and lower parts of the repair cylinder can be connected by any two combination modes, and the assembly and disassembly are convenient.

Further, the welding seam groove is a spiral welding seam groove or a straight welding seam groove or a flat welding seam groove.

The beneficial effect of adopting the above-mentioned further scheme is that the welding seam groove is determined according to the welding seam characteristics of the construction object, and the selection is various.

Further, the bite is a single flat bite or a single vertical bite or a combined angle bite or a snap-type bite or a corner bite.

The beneficial effects of adopting the above-mentioned further scheme are: the fixing effect is good, and the assembly and disassembly are convenient.

Further, the friction surface connecting member is a steel brush surface or a high-density rubber surface or a small ball surface.

The beneficial effect of adopting the above-mentioned further scheme is that the structure is simple and the repairing cylinder can be effectively connected.

A method for repairing oil and gas pipeline defects, using the oil and gas pipeline defect repairing device, comprising the following steps:

S1: Depressurize or stop the transmission of the defective pipe body, and determine the size and connection method of the sleeve;

S2: Preprocess the outer surface of the defective tube, remove the anti-corrosion layer, and clean and dry;

S3: After aligning the weld groove (2) of the repair cylinder with the weld of the pipe body, fix it on the pipe body;

S4: The outer wall of the repair cylinder is wound with a fixer.

The beneficial effects are as follows: the steel cylinder body is repaired by a non-welded buckle type method, the construction process is safe and economical, the construction method is simple to operate, the repairing time is short, and no power support is required.

Further, in step S3, before aligning the repair cylinder with the pipe body, a metal repair agent needs to be painted on the inner wall of the repair cylinder.

The beneficial effect of adopting the above-mentioned further scheme is that the surface of the metal part to be repaired is used to repair the metal or impart special functions to the metal surface.

Further, in step S4, the fixing object winding includes polyethylene cold wrapping tape fixation wrapping, polypropylene cold wrap tape fixation wrapping, iron chain wrapping and locking, epoxy resin painting, epoxy coal pitch painting, glass fiber ring One or more of the oxygen coal tar coating and epoxy resin carbon fiber composite coating and winding methods.

The beneficial effects of adopting the above-mentioned further scheme are: the repairing cylinder is further fixed and the stability is improved.

Description of drawings

Fig. 1 is the structural representation of semi-cylindrical cylinder;

2 is a schematic structural diagram of Embodiment 1;

3 is a schematic diagram of the installation position of the detachable connector according to the first embodiment;

4 is a schematic structural diagram of Embodiment 2;

5 is a schematic structural diagram of Embodiment 3;

6 is one of the schematic structural diagrams of the structural schematic diagram of the detachable connector according to the fourth embodiment;

FIG. 7 is the second structural schematic diagram of the structural schematic diagram of the detachable connector according to the fourth embodiment;

FIG. 8 is a third schematic structural diagram of the structural schematic diagram of the detachable connector according to the fourth embodiment;

9 is a schematic structural diagram of a structural schematic diagram of a detachable connector according to Embodiment 5;

Fig. 10 is the test diagram of the pipe bending resistance after repair in Experimental Example 1;

Fig. 11 is the test diagram of the internal pressure resistance test of the pipeline after the repair of Experimental Example 2;

Figure 12 is an experimental diagram of the pipeline pressure after repair in Experimental Example 2;

In the accompanying drawings, the list of components represented by each number is as follows:

1. Semi-cylindrical body; 2. Weld groove; 3. Hinge; 4. Bite; 5. Steel brush surface; 6. Bolt; 7. High-density rubber surface; 8. Small ball surface.

Detailed ways

The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples are only used to explain the present invention, but not to limit the scope of the present invention.

As shown in FIG. 1 , the present embodiment provides an oil and gas pipeline defect repairing device, which includes two semi-cylindrical cylinders 1 . The modulus is not less than 90% of the elastic modulus of the steel of the pipe body, the yield strength is not less than 95% of the yield strength of the steel of the pipe body, and the hardness is not less than 85% of the hardness of the steel of the pipe body, but the highest is not greater than the Brinell hardness HB320. The upper and lower parts of the two semi-cylindrical cylinders 1 are connected by detachable connectors to form a cylindrical repair cylinder. The overall radius of the steel repair cylinder is 100.5-105% of the radius of the tube body, and the maximum is not greater than the radius of the tube body. 5mm; the axial length is 1500mm-2500mm; the overall ovality is 2%-4% of the outer diameter SD of the sleeve when the diameter of the construction object is PD<508mm, and 1.5%-2.5% of the SD when PD>508mm. When the thickness is PD<508mm, it is 80-150% of the thickness of the pipe wall of the construction object, and when PD<508mm, it is 60-120% of the thickness of the pipe wall of the construction object; the repair cylinder is provided with an annular weld groove 2, The welding seam groove 2 is divided into a spiral welding seam groove, a straight welding seam groove and a flat welding seam groove according to the welding seam characteristics of the construction object. The interference between the groove curvature radius and the actual weld curvature radius is 0.50-4.50mm, the interference ratio is 8-60%, and the groove height does not exceed 7% of the sleeve thickness.

Example 1

As shown in Figures 2 and 3 , the upper part of the two semi-cylindrical cylinders 1 is provided with a mutually matching occlusal opening 4, and the lower part is provided with a hinge 3, which is connected by a common pin shaft.

Embodiment 2

The difference between this embodiment and the first embodiment is that:

As shown in Figure 4, the upper and lower parts of the two semi-cylindrical cylinders 1 are provided with hinges 3, which are connected by a shared pin and welded to the sleeve body in advance. The diameter of the hinges 3 is smaller than or equal to the sleeve wall Thick, the inner and outer sides are not higher than the pipe wall, preventing the protruding structure from causing obstacles to the close fit of the inner construction object and the outer composite material.

Embodiment 3

The difference between this embodiment and the second embodiment is that:

As shown in FIG. 5 , the upper and lower parts of the two semi-cylindrical cylinders 1 are provided with mutually matched bite openings 4 , and the interference of the bite openings is 20-35% of the wall thickness of the sleeve.

Embodiment 4

The difference between this embodiment and the third embodiment is that:

As shown in FIG. 6 , the upper and lower parts of the two semi-cylindrical cylinders 1 are connected by a steel brush surface 5; The detachable connector structure in the steel brush, the interference of the friction surface of the steel brush is 30-60% of the wall thickness of the sleeve;

As shown in FIG. 7 , the upper and lower parts of the two semi-cylindrical cylinders 1 are connected by high-density rubber surfaces 7; Removable connector structure, high-density rubber friction surface interference is 15-25% of the sleeve wall thickness;

As shown in FIG. 8 , the upper and lower parts of the two semi-cylindrical cylinders 1 are connected by small bead surfaces 8; Removable connector structure, the interference of the small ball friction surface is 10-30% of the wall thickness of the sleeve.

Embodiment 5

The difference between this embodiment and the fourth embodiment is that:

As shown in Figure 9, the upper and lower parts of the two semi-cylindrical cylinders 1 are connected by bolts 6; or any one of the upper and lower parts is connected by bolts 6, and the other adopts the detachable connector structure in other embodiments; The radius of the opening of the bolt connection is 60%-200% of the wall thickness of the sleeve, the radius of the opening of the connecting piece connection method is 100%-300% of the wall thickness of the sleeve, the length of the connecting piece is 30mm-60mm, and the two holes are centered. The interval is an arithmetic sequence with a tolerance of 1mm, and the distance between the holes is not less than 3mm from the edge.

A method for repairing oil and gas pipeline defects, using the oil and gas pipeline defect repairing device, comprising the following steps:

S1: Depressurize or stop the transmission of the defective pipe body, and determine the size and connection method of the sleeve;

S2: Preprocess the outer surface of the defective tube, remove the anti-corrosion layer, and clean and dry;

S3: After aligning the welding seam groove 2 of the repair cylinder with the welding seam of the pipe body, fix it on the pipe body;

S4: The outer wall of the repair cylinder is wound with a fixer.

Further, in step S3, before aligning the repair cylinder with the pipe body, a metal repair agent needs to be painted on the inner wall of the repair cylinder. Strong JL757, Huirui HR8102, Huirui HR8101, Huirui HR8112, Huirui HR8114, Huirui HR8215, Loctite 44143, Kesaixin TS626, Kesaixin TS406, Huili Rubber Industry TX8518, Chuangya HT101, Tiansai TS6111, One or more combinations of Tiansai TS111.

Further, in step S4, the fixing object winding includes polyethylene cold wrapping tape fixation wrapping, polypropylene cold wrap tape fixation wrapping, iron chain wrapping and locking, epoxy resin painting, epoxy coal pitch painting, glass fiber One or more of epoxy coal tar coating, epoxy resin carbon fiber composite coating and winding methods.

Experimental example 1

In a natural gas pipeline test site in Beijing, the design and manufacture of the snap-fit steel sleeve for repairing the non-welded pipe body according to the present invention and the simulated field test of the pipeline repair were carried out. The snap-fit steel sleeve is difficult to process due to the special arc structure and the structural characteristics of the hinge and bolt reinforced version. After in-depth research, extensive discussions, and in-depth cooperation with machinery factories, technical members have overcome difficulties such as large machining allowances, complex shapes, high dimensional accuracy, and long processing time. Fast feed, axial rotation and other processes have overcome the problems of poor toughness and easy deformation of X70 pipes, and improved the machining accuracy. After more than 100 hours, a set of finished products with precise dimensions and high strength was produced. The overall processing process and finished products are shown in Figure 1 and Figure 1. The finished product has passed the mechanical inspection and testing, and has passed the verification of the repair test of the pipe body defect of the OD1016mm pipeline.

The sleeve material is made of X70 pipe steel, the inner wall diameter is 1022mm, that is, the gap with the pipe is 3mm, so as to be filled with high-strength metal repair agent. The inner side of the main body of the steel sleeve is provided with a spiral weld groove (which exactly matches the pipe spiral weld of the pipeline to be repaired). It is fixed on the main structure of the steel sleeve by pre-welding, and the sleeve is installed and fixed by manually tightening the bolts during on-site construction.

During on-site installation, the parts to be repaired are first sandblasted to remove rust, and the surface treatment level reaches Sa2.5. Then apply Kesaixin TS626 high-strength metal repair agent, and install the sleeve within 20 minutes after painting. One end of the sleeve has been pre-connected with a hinge structure, and the other side is aligned to fasten the sleeve with bolts. The whole process uses hydraulic jacks and cranes for position adjustment and sleeve support.

After the sleeve is installed, the outer surface is wound with carbon fiber epoxy resin composite material by hand lay-up. After 6 hours, the epoxy resin is dry, and all the repair work is completed.

The girth weld defect of the pipeline in this experimental example is a volumetric defect with a depth of 70% of the wall thickness. The sleeve of the present invention is used to repair it, and the four-point bending test and the withstand pressure test are all qualified and meet the pipeline requirements. Anti-bending and anti-internal pressure effect. Among them, the bending resistance eventually occurs plastic deformation of the pipeline under the condition of 8 tons at each end and an internal pressure of 10 MPa, but no failure occurs at the position of the girth weld, as shown in Figure 10; The design pressure of the pipeline without pipeline failure is 10MPa, as shown in Figure 11.

Experiment 2

In a natural gas pipeline test site in Shenyang, the second design and manufacture of the snap-fit steel sleeve for the repair of the non-welded pipe body of the present invention and the simulated field test of the pipeline repair were carried out. The outer diameter of the pipeline to be repaired this time is OD1422mm, and the material is X80 pipe steel. The snap-fit steel sleeve is similar to the first design and manufacturing process, but considering the increase in the diameter of the pipeline to be repaired, the sleeve is designed as a 3-lobed structure, and 1 of the 3 connection positions is a hinge connection (pin shaft hinge connection), and the other 2 are bolted connections.

During on-site installation, the parts to be repaired are first sandblasted to remove rust, and the surface treatment level reaches Sa2.5. Then apply Kesaixin TS406 high-strength metal repair agent, and install the sleeve within 30 minutes after painting. One end of the sleeve has been pre-connected with a hinge structure, and the other two sides are aligned to fasten the sleeve with bolts. Hydraulic jacks and cranes are used to adjust the position and support the sleeve in the whole process.

After the sleeve is installed, the outer surface is wound with carbon fiber epoxy resin composite material by hand lay-up. After 6 hours, the epoxy resin is dry, and all the repair work is completed.

The pipe girth weld defect in this experimental example is a volumetric defect with a depth of 60% of the wall thickness. The sleeve of the present invention is used to repair it, and the tests are passed through the pressure resistance test, the pressure fluctuation test and the blasting test. The anti-bending and anti-internal pressure effect required by the pipeline. Among them, the pressure resistance test is to release the pressure after pressing to 20MPa for 30min, and the pipeline does not fail; the pressure fluctuation test is tested through 12-18MPa and 100 pressure cycles, and the pipeline does not fail; the blasting test is to continue to pressurize until the pipeline bursts, and finally at 25MPa The pipeline fails and burst, and the failure position is located at the normal pipe body, not at the defect of the pipeline girth weld, which proves that the repair technology provided by the present invention has exceeded the normal strength of the pipeline. The pressure test data is shown in Figure 12.

The above two experimental examples prove that the repair device provided by the present invention has the advantages of good bending resistance and excellent resistance to axial stress, and the repaired oil and gas pipeline can reach or even exceed the initial mechanical performance level of the pipeline. The second experimental example of the present invention verifies the feasibility of repairing the girth weld defect and volume loss defect of the oil and gas pipeline by the snap-fit steel sleeve used for the repair of the non-welded pipe body and the use method, and provides an effective set for the repair of the pipeline. The whole process of non-fire maintenance solutions.

In the description of the present invention, it should be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "inner", "outer", "circumferential side", "circumferential direction", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention. The invention and simplified description do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (8)

1. The utility model provides an oil gas pipeline defect prosthetic devices, its characterized in that includes two semi-cylindrical barrel (1), two the upper portion, the lower part of semi-cylindrical barrel (1) are all connected and are constituteed a columniform restoration section of thick bamboo through dismantling the connecting piece, be equipped with annular welding seam slot (2) in the restoration section of thick bamboo.

2. The oil and gas pipeline defect remediating device of claim 1, wherein the detachable connection is a hinge (3) or a snap joint (4) or a friction surface connection or a bolt (6).

3. The oil and gas pipeline defect repair device according to claim 1, wherein the weld groove (2) is a spiral weld groove or a straight weld groove or a flat weld groove.

4. The oil and gas pipeline defect repair device according to claim 2, wherein the bite (4) is a single flat bite or a single vertical bite or a joint angle bite or a snap-on bite or a corner bite.

5. The oil and gas pipeline defect remediating device as defined in claim 2, wherein the friction surface connection is a steel brush surface (5) or a high density rubber surface (7) or a small bead surface (8).

6. An oil and gas pipeline defect repairing method, characterized in that the oil and gas pipeline defect repairing device of any one of claims 1-5 is adopted, and comprises the following steps:

s1: carrying out depressurization or stopping conveying on the defective pipe body, and determining the size and the connection mode of the sleeve;

s2: pretreating the outer surface of the defective pipe body, removing an anticorrosive coating, cleaning and drying;

s3: after the welding seam groove (2) of the repair cylinder is aligned with the welding seam of the pipe body, the pipe body is fixed on the repair cylinder;

s4: and (5) winding the outer wall of the repair cylinder by a fixture.

7. The method for repairing defects in an oil and gas pipeline as claimed in claim 6, wherein in step S3, before aligning the repair cylinder with the pipeline body, a metallic repair agent is applied to the inner wall of the repair cylinder.

8. The method for repairing a defect in an oil and gas pipeline according to claim 7, wherein in step S4, the fixture winding includes one or more of fixing and winding a polyethylene cold winding tape, fixing and winding a polypropylene cold winding tape, winding and locking an iron chain, brushing epoxy resin, brushing epoxy coal pitch, brushing glass fiber epoxy coal pitch, and brushing and winding epoxy resin carbon fiber composite material.

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