why subsea pipeline pigging is necessary

Introduction

Subsea pipeline pigging is a critical maintenance operation in the oil and gas industry. It involves the use of devices known as "pigs" to clean, inspect, and maintain pipelines. This process is essential for ensuring the efficient and safe operation of subsea pipelines, which are prone to issues such as wax deposition, corrosion, and debris accumulation.

Key Insights

Wax and Debris Removal:
- Pigging is essential for removing wax, scale, and other debris that accumulate inside subsea pipelines, which helps maintain pipeline efficiency and prevent blockages .
Corrosion Control:
- Regular pigging operations help reduce internal corrosion, including microbiologically influenced corrosion (MIC) and "dirt" corrosion, by clearing wall sediments and inhibiting the growth of sulfate-reducing bacteria (SRB) .
Operational Efficiency and Longevity:
- Pigging is crucial for maintaining the original design performance of pipelines, extending their useful life, and ensuring they can operate indefinitely without significant interruptions .
Safety and Risk Management:
- Pigging operations are necessary to prevent liquid loading, freezing, and plugging accidents, which are common in complex subsea pipeline networks. Proper pigging programs and hazard evaluations are essential for safe operations .
Inspection and Data Gathering:
- Pigging allows for internal inspection of pipelines using various types of pigs, such as gauging plates, caliper pigs, and smart pigs, which help in integrity management and data collection .

Conclusion

Subsea pipeline pigging is a vital maintenance practice that ensures the efficient, safe, and long-term operation of pipelines. It addresses issues such as wax and debris accumulation, internal corrosion, and operational risks, while also facilitating pipeline inspection and data gathering. Regular pigging operations are essential for maintaining pipeline integrity and performance, ultimately extending the lifespan of subsea pipelines.

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Why subsea pipeline pigging is necessary

Summary

Introduction

Key Insights

Conclusion

Sources and full results

Influence of Pigging Velocity on the Wax Removal Process in Subsea Pipelines

High pipe pig speed significantly increases wax breaking force in subsea pipelines, with disk pigs having a higher force than cup pigs.

Pipeline Pigging and Inspection

Pigging in pipelines improves efficiency, longevity, and risk reduction by removing debris, maintaining original design performance, and extending the useful life of the pipeline.

Problems with Operational Pigging In Low Flow Oil Pipelines

Pigging in low flow oil pipelines can cause significant disruption and costly subsea intervention, highlighting the need for better understanding and management of pigging operations in these modes of operation.

Combined pigging techniques for the subsea gas transmission pipeline network at the Southwest Bohai Bay

The combined pigging technique effectively removed 170 m3 of liquid loading from the Southwest Bohai Bay subsea gas transmission pipeline network, improving safety and production efficiency.

Subsea pigging and notes

Subsea pigging is essential for deepwater oil gas development, but requires hazard evaluation, proper procedures, and emergent measures to avoid potential risks.

The Pigging and Corrosion Research of Chun-xiao Oil and Gas Field’s Gathering Pipeline

Pigging effectively reduces microbiologically influenced corrosion and "dirt" corrosion in oil and gas pipelines, reducing the need for chemical corrosion control measures.

A CASE STUDY ON THE COMMISSIONING OF SUBSEA NATURAL GAS PIPELINE

The drying proposal combining gel, dryer and cleaning pig effectively solves airproof, pig jam, and gel residence problems, ensuring construction quality in subsea gas pipelines.

Necessity and suitability of in-line inspection for corrosion resistant alloy (CRA) clad pipelines

In-line inspection using intelligent pigging is necessary for corrosion resistant alloy (CRA) clad pipelines, as it can prevent damage to the pipeline's clad layer and sensor carriers.

Review on Subsea Pipeline Integrity Management: An Operator’s Perspective

Effective subsea pipeline integrity management systems can help operators maintain the condition of ageing pipelines and avoid unnecessary shutdowns.

Design of Subsea Pig Launching Systems

Subsea multiple pig launching systems can provide reliable, cost-effective, and long-lasting pigging facilities for pipeline maintenance, utilizing remote operation and minimal intervention times.

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