Gel pigging improvement
A method for performing ultrasonic inspection to a pipe is described, comprising: introducing an in-line inspection tool assembly into a pipe, wherein the in-line inspection tool assembly comprises a gel reservoir and an ultrasonic inspection tool flanked by a pair of batching pigs, wherein the gel reservoir holds a first gel couplant; and driving the in-line inspection tool assembly along the pipe while performing ultrasonic inspection; wherein a gel slug is formed between the pair of batching pigs, and the gel slug facilitates the ultrasonic inspection.
1. A method for performing ultrasonic inspection of a pipe, comprising:
a) introducing an in-line inspection tool assembly into the pipe, wherein the in-line inspection tool assembly comprises an ultrasonic inspection tool that is flanked by a pair of batching pigs comprising a first batching pig and a second batching pig, wherein at least one of the first and second batching pigs includes a gel reservoir for storing a first gel couplant, and wherein the gel reservoir holds the first gel couplant; and
b) driving the in-line inspection tool assembly along the pipe while performing ultrasonic inspection;
wherein a gel slug is formed between the pair of batching pigs, and said gel slug facilitates the ultrasonic inspection.
2. The method of claim 1 , wherein the gel slug is formed by releasing the gel from the gel reservoir into the pipe between the pair of batching pigs.
3. The method of claim 1 , wherein the in-line inspection tool assembly further comprises seals adjacent to the ultrasonic inspection tool to form a closed chamber encompassing the ultrasonic inspection tool.
4. The method of claim 3 , wherein the gel slug is formed within the closed chamber.
5. The method of claim 1 , wherein the gel serves as couplant for ultrasonic inspection.
6. The method of claim 1 , wherein the in-line inspection tool assembly further comprising a gel recovery device to collect and recycle the gel.
7. The method of claim 6 , wherein the gel recovery device comprises a scraper disk.
8. The method of claim 6 , wherein the gel recovery device recovers gel after the ultrasonic inspection tool passes, and the recovered gel is re-supplied in front of the ultrasonic inspection tool.
9. The method of claim 1 , further comprising, prior to step (a):
introducing a first gel couplant into the pipe.
10. The method of claim 1 , wherein the ultrasonic inspection tool is further surrounded by a second gel couplant, wherein the second gel couplant has a different composition than the first gel couplant.
11. The method of claim 10 , wherein the second gel couplant is semi-rigid.
12. The method of claim 1 , further comprising: supplying the first gel couplant between the first and the second batching pigs from the gel reservoir.
13. A method for performing ultrasonic inspection of a pipe, comprising:
a) introducing an in-line inspection tool assembly into the pipe, wherein the in-line inspection tool assembly comprises an ultrasonic inspection tool between a pair of batching pigs; and
b) driving the in-line inspection tool assembly along the pipe while performing ultrasonic inspection;
wherein the ultrasonic inspection tool is surrounded by a gel couplant for ultrasonic inspection, and wherein the gel couplant is a semi-rigid gel couplant that is surrounded by a fluid gel couplant in a first direction of moving the ultrasonic inspection tool and in a second direction opposite from the direction of moving the ultrasonic inspection tool.
14. An in-line inspection tool assembly for performing ultrasonic inspection in a pipe, said in-line inspection tool assembly comprises a first batching pig, a second batching pig, and an ultrasonic inspection tool, wherein at least one of the first and second batching pigs comprises a gel reservoir that holds a first gel couplant and wherein a gel slug is formed around the ultrasonic inspection tool to facilitate ultrasonic inspection.
15. The inspection tool assembly of claim 14 , further comprising a first seal and a second seal, wherein the first and second seals flank the ultrasonic inspection tool to form a closed chamber encompassing the ultrasonic inspection tool.
16. The inspection tool assembly of claim 15 , wherein the gel slug is formed within the closed chamber.
17. The inspection tool assembly of claim 14 , further comprising a gel recovery device between the first and the second batching pigs, wherein said gel recovery device recovers gel couplant after the ultrasonic inspection passes.
18. The inspection tool assembly of claim 17 , wherein the recovered gel is re-supplied in front of the ultrasonic inspection tool.
19. The inspection tool assembly of claim 14 , further comprising a second gel couplant surrounding the ultrasonic inspection tool, wherein the second gel couplant has a different composition than the first gel couplant.
20. The inspection tool assembly of claim 14 , wherein the ultrasonic inspection tool is surround by a semi-rigid gel couplant.
21. The method of claim 1 , wherein the in-line inspection tool assembly further comprises a plasma gel extruder configured for providing the first gel couplant around the ultrasonic inspection tool.