A method for repairing cracks in a subsea jacket by using a split clamp

Abstract

The application discloses a kind of split clamp to underwater jacket crack repair method. Including the following steps: S1, prefabrication 1:1 jacket model;S2, design split clamp;S3, set grouting port and slurry outlet;S4, configure grouting material;S5, enter multiple shell, and carry out installation;S6, after installation, grouting port is connected with grouting hose respectively;Again, grouting main pipe is sequentially connected with grouting pipe;S7, grouting is carried out one by one, until the pouring of all grouting ports is completed;S8, wait for 7-9 hours, complete repair.The beneficial effects of the present application are: by multiple-piece clamp, the jacket to be repaired is enclosed outside, and then the annular area formed by the jacket and the clamp is poured to achieve the purpose of repairing the jacket.

Description

Technical Field

[0001] This invention relates to the field of petrochemical technology, and in particular to a method for repairing cracks in underwater jackets using a detachable clamp. Background Technology

[0002] During the annual intermediate inspection of underwater structures at the Penglai 19-3 oilfield, visual inspection of weld II and ACFM testing revealed nine defects in the WHPC jacket structure. Two of these defects were visually visible cracks. To address the current issue of cracks in offshore oil platform jacket structures, the grouting clamping method eliminates the need for floating cranes in terms of cost. The underwater clamps, using bolt connections, replace underwater welding, reducing operational risks.

[0003] In the complex and harsh marine environment, factors such as seawater erosion and marine organism attachment can cause varying degrees of damage to the underwater jacket of offshore platforms. Damaged components require frequent maintenance, repair, and reinforcement. Multi-piece split clamps utilize a non-self-stressing clamping method, eliminating the need for underwater welding. Crack treatment is achieved through grouting and curing, making it more economical and providing better reinforcement. Summary of the Invention

[0004] The purpose of this invention is to provide a method for repairing cracks in underwater jackets using a split clamp. This method involves enclosing the jacket to be repaired with a multi-piece clamp, and then pouring concrete into the annular area formed by the jacket and the clamp to repair the jacket.

[0005] To achieve the above objectives, the present invention adopts the following technical solution, comprising the following steps:

[0006] S1. Measure the catheter stent to be repaired, obtain the data information of the catheter stent, and prefabricate a 1:1 catheter stent model based on the obtained data information.

[0007] S2. Based on the prefabricated 1:1 guide frame model, design a split clamp. The split clamp is composed of multiple shell pieces connected by bolts. The shape of the assembled split clamp is adapted to the shape of the guide frame, and is used to surround the outer periphery of the guide frame. A gap of 70mm to 140mm is provided between the split clamp and the guide frame.

[0008] S3. A grouting port and a grout outlet are respectively provided on each branch of the split clamp;

[0009] S4. Prepare a grouting material using cement, wherein the cement content in the grouting material is 8.4%–8.8%; the friction coefficient of the grouting material is 0.35–0.45, the maximum particle size is 3–5 mm, the final setting time is 8–10 hours, the surface flowability is 260–280 mm within 2 hours, and the air content is 1.5–2.5%.

[0010] S5. Lower the multiple housing pieces and install them;

[0011] S6. After installation, connect the grouting inlets to the grouting hoses respectively; then connect the main grouting pipe to the grouting hose in sequence.

[0012] S7. Grouting is carried out one by one; when the actual amount of grouting reaches the theoretical amount of grouting, pumping continues for 5-6 minutes and then pumping is stopped; until all grouting ports are completed.

[0013] S8. Wait 7-9 hours for solidification to complete the repair.

[0014] Preferably, in step S3, the grouting port on the same branch is located below the grout outlet.

[0015] Preferably, in step S7, the pipes need to be lubricated before grouting. The method of lubricating the pipes is to lubricate the inner diameter of the grouting main pipe and the grouting hose with grouting material to ensure that the grouting main pipe and the grouting hose flow smoothly without blockage.

[0016] Preferably, in step S7, the theoretical grouting volume = the volume of the annulus to be poured × the density of the grouting material.

[0017] Preferably, in step S4, the cement content in the grout is 8.6%.

[0018] Preferably, in step S8, the solidified cement block has a compressive strength of 1337–1347 kN, a tensile strength of 7.5–8.5 MPa, a static elastic modulus of 52–54 GPa, and a chloride ion diffusion coefficient of 0.6 × 10⁻⁶. -13 ㎡ / s~1.8×10 -13 ㎡ / s, seepage rate is 0.

[0019] The beneficial effects of this invention are: by using multi-piece clamps to surround the outside of the jacket structure to be repaired, and then casting the annular area formed by the jacket structure and the clamps, the purpose of repairing the jacket structure is achieved. Attached Figure Description

[0020] Figure 1 This is an exploded view of the clamp in Embodiment 1 of the present invention. Detailed Implementation

[0021] The invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0022] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0023] Example 1

[0024] like Figure 1 As shown, to achieve the above objectives, the present invention adopts the following technical solution, including the following steps:

[0025] S1. Measure the catheter stent to be repaired, obtain the data information of the catheter stent, and prefabricate a 1:1 catheter stent model based on the obtained data information.

[0026] S2. Based on the prefabricated 1:1 guide frame model, design a split clamp 1, which is composed of 7 shells connected by bolts; the shells are respectively the first shell 110, the second shell 120, the third shell 130, the fourth shell 140, the fifth shell 150, the sixth shell 160, and the seventh shell 170. The shape of the assembled split clamp 1 is adapted to the shape of the guide frame, and is used to surround the outer periphery of the guide frame, with a gap of 100mm between it and the guide frame;

[0027] S3. A grouting port and a grout outlet are respectively provided on each branch of the split clamp 1; the grouting port on the same branch is located below the grout outlet;

[0028] S4. Prepare a grouting material using cement, wherein the cement content of the grouting material is 8.6%; the friction coefficient of the grouting material is 0.4, the maximum particle size is 4mm, the final setting time is 9 hours, the surface flowability is 270mm within 2 hours, and the air content is 2%.

[0029] S5. Lower the first housing 110, the second housing 120, the third housing 130, the fourth housing 140, the fifth housing 150, the sixth housing 160 and the seventh housing 170 and install them;

[0030] S6. After installation, connect the grouting inlets to the grouting hoses respectively; then connect the main grouting pipe to the grouting hose in sequence.

[0031] S7. First, lubricate the pipes, then grout each one individually; once the actual grouting volume reaches the theoretical grouting volume, continue pumping for 5.5 minutes and then stop pumping; the theoretical grouting volume = volume of the annulus to be poured × density of the grouting material. Continue until all grouting ports are filled;

[0032] S8. Allow 8 hours for solidification to complete the repair; after solidification, the cement block has a compressive strength of 1342 kN, a tensile strength of 8 MPa, a static elastic modulus of 53 GPa, and a chloride ion diffusion coefficient of 1.2 × 10⁻⁶. -13 ㎡ / s, seepage rate is 0.

[0033] Example 2

[0034] To achieve the above objectives, the present invention adopts the following technical solution, comprising the following steps:

[0035] S1. Measure the catheter stent to be repaired, obtain the data information of the catheter stent, and prefabricate a 1:1 catheter stent model based on the obtained data information.

[0036] S2. Based on the prefabricated 1:1 guide frame model, design a split clamp. The split clamp is composed of 8 shell pieces connected by bolts. The shape of the split clamp after assembly is adapted to the shape of the guide frame, and is used to surround the outer periphery of the guide frame. A gap of 70mm is provided between the split clamp and the guide frame.

[0037] S3. A grouting port and a grout outlet are respectively provided on each branch of the split clamp; the grouting port on the same branch is located below the grout outlet;

[0038] S4. Prepare a grouting material using cement, wherein the cement content of the grouting material is 8.4%; the friction coefficient of the grouting material is 0.45, the maximum particle size is 3mm, the final setting time is 10 hours, the surface flowability is 260mm within 2 hours, and the air content is 2.5%.

[0039] S5. Insert the 8 housing pieces and install them;

[0040] S6. After installation, connect the grouting inlets to the grouting hoses respectively; then connect the main grouting pipe to the grouting hose in sequence.

[0041] S7. First, lubricate the pipes, then grout each one individually. Once the actual grout volume reaches the theoretical grout volume, continue pumping for 5 minutes, then stop pumping. The theoretical grout volume = volume of the annulus to be poured × density of the grout material. Continue until all grouting ports are filled.

[0042] S8. Allow 9 hours for solidification to complete the repair; after solidification, the cement block has a compressive strength of 1337 kN, a tensile strength of 8.5 MPa, a static elastic modulus of 52 GPa, and a chloride ion diffusion coefficient of 0.6 × 10⁻⁶. -13 ㎡ / s, seepage rate is 0.

[0043] Example 3

[0044] To achieve the above objectives, the present invention adopts the following technical solution, comprising the following steps:

[0045] S1. Measure the catheter stent to be repaired, obtain the data information of the catheter stent, and prefabricate a 1:1 catheter stent model based on the obtained data information.

[0046] S2. Based on the prefabricated 1:1 guide frame model, design a split clamp. The split clamp is composed of 9 shell pieces connected by bolts. The shape of the assembled split clamp is adapted to the shape of the guide frame, and is used to surround the outer periphery of the guide frame. A gap of 140mm is provided between the split clamp and the guide frame.

[0047] S3. A grouting port and a grout outlet are respectively provided on each branch of the split clamp; the grouting port on the same branch is located below the grout outlet;

[0048] S4. Prepare a grouting material using cement, wherein the cement content of the grouting material is 8.8%; the friction coefficient of the grouting material is 0.35, the maximum particle size is 5mm, the final setting time is 8 hours, the surface flowability is 280mm within 2 hours, and the air content is 1.5%.

[0049] S5. Lower the multiple housing pieces and install them;

[0050] S6. After installation, connect the grouting inlets to the grouting hoses respectively; then connect the main grouting pipe to the grouting hose in sequence.

[0051] S7. First, lubricate the pipes, then grout each one individually; once the actual grouting volume reaches the theoretical grouting volume, continue pumping for 6 minutes and then stop pumping; the theoretical grouting volume = volume of the annulus to be poured × density of the grouting material. Continue until all grouting ports are filled;

[0052] S8. Allow 7 hours for solidification to complete the repair; after solidification, the cement block has a compressive strength of 1347 kN, a tensile strength of 7.5 MPa, a static elastic modulus of 54 GPa, and a chloride ion diffusion coefficient of 1.8 × 10⁻⁶. -13 ㎡ / s, seepage rate is 0.

[0053] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for repairing cracks in underwater jacket structures using a detachable clamp, characterized in that, Includes the following steps: S1. Measure the catheter stent to be repaired, obtain the data information of the catheter stent, and prefabricate a 1:1 catheter stent model based on the obtained data information. S2. Based on the prefabricated 1:1 guide frame model, design a split clamp. The split clamp is composed of multiple shell pieces connected by bolts. The shape of the assembled split clamp is adapted to the shape of the guide frame, and is used to surround the outer periphery of the guide frame. A gap of 70mm to 140mm is provided between the split clamp and the guide frame. S3. A grouting port and a grout outlet are respectively provided on each branch of the split clamp; S4. Prepare a grouting material using cement, wherein the cement content in the grouting material is 8.4%–8.8%; the friction coefficient of the grouting material is 0.35–0.45, the maximum particle size is 3–5 mm, the final setting time is 8–10 hours, the surface flowability is 260–280 mm within 2 hours, and the air content is 1.5–2.5%. S5. Lower the multiple housing pieces and install them; S6. After installation, connect the grouting inlets to the grouting hoses respectively; then connect the main grouting pipe to the grouting hose in sequence. S7. Grouting is carried out one by one; when the actual amount of grouting reaches the theoretical amount of grouting, pumping continues for 5-6 minutes and then pumping is stopped; until all grouting ports are completed. S8. Wait 7-9 hours for solidification to complete the repair.

2. The method for repairing underwater jacket cracks using a detachable clamp as described in claim 1, characterized in that: In step S3, the grouting port on the same branch is located below the grout outlet.

3. The method for repairing underwater jacket cracks using a detachable clamp as described in claim 1, characterized in that: In step S7, the pipes need to be lubricated before grouting. The method of lubricating the pipes is to lubricate the inner diameter of the grouting main pipe and the grouting hose with grout material to ensure that the grouting main pipe and the grouting hose flow smoothly without blockage.

4. The method for repairing underwater jacket cracks using a detachable clamp as described in claim 1, characterized in that: In step S7, the theoretical grouting volume = the volume of the annulus to be poured × the density of the grouting material.

5. The method for repairing underwater jacket cracks using a detachable clamp as described in claim 1, characterized in that: In step S4, the cement content in the grout is 8.6%.

6. The method for repairing underwater jacket cracks using a detachable clamp as described in claim 1, characterized in that: In step S8, the solidified cement block has a compressive strength of 1337–1347 kN, a tensile strength of 7.5–8.5 MPa, a static elastic modulus of 52–54 GPa, and a chloride ion diffusion coefficient of 0.6 × 10⁻⁶. -13 ㎡ / s~1.8×10 -13 ㎡ / s, seepage rate is 0.

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