Method and device for quickly replacing oil gas pipe section

Abstract

The invention relates to a method and a device for quickly replacing an oil gas pipe section. The method comprises the steps of measuring the pipe section accurately on line by laser, performing data-graph transformation, prefabricating the pipeline accurately off line, and replacing the pipe section quickly on site. The pipe section to be replaced does not need to be disassembled on site in advance; the pipeline can normally operate all the time before the pipe section is replaced; and production is not stopped. The space geometric morphology data of the replaced pipe section is measured accurate by a laser overall meter and a measuring maker, so that the data of the replaced pipe section is acquired, and on-line, quick and accurate measurement of the pipe section is realized. The measuring data of the pipe section is transformed into a replacing pipe section welding technical graph by special data-image processing software. Off-line accurate prefabrication of the replacing pipe is finished by the obtained replacing pipe section welding technical graph and a special replacing pipe section welding device. The pipe section is replaced quickly and safely by the prefabricated pipe section on the pipeline maintaining site and under the condition that production is stopped for a short time.

Description

technical field [0001] The invention belongs to a method and a device for quick replacement of oil and gas pipeline sections. Background technique [0002] The offshore oil industry occupies an important position in my country and has a good development prospect. my country's offshore oil exploration and production has a history of more than 40 years. At present, many offshore oil platforms, oil and gas processing terminal pipe network systems and their facilities are gradually entering into maintenance, replacement and technical transformation. peak period. Taking CNOOC Nanhai West Petroleum Company as an example, at present, the annual workload for oil and gas pipeline transformation and replacement of drilling wells, oil production platforms and oil and gas processing terminals is about 10,000 meters per year, and the direct annual output value is about 200 million yuan. Retrofit work continues to grow at a rate of about 10%. [0003] The maintenance and replacement of o...

AI Technical Summary

Problems solved by technology

Therefore, the work efficiency of the traditional oil and gas pipeline segment replacement technology is low, and production operations need to be stopped, resulting in a long-term shutdown of the entire or partial pipeline network (depending on the complexity of the replaced pipeline segment, generally 5-10 days). CNOOC Nanhai West Company as an example For example, the economic loss caused by the forced shutdown of the pipe network due to the replacement of pipe sections is more than 8 million yuan each year; in addition, due to the backward measurement methods of the copied pipe sections, the accuracy of the copied pipe sections is low, and it is often difficult to replace the replaced pipe sections during installation. The bolt holes on the original connecting flanges on the pipeline are completely aligned, and the installation of the pipeline section needs to be completed by using a thermal correction method on the pipeline site. Due to the fire on the pipeline network site, there is a huge risk of explosion safety hazards caused by open flames on the oil and gas pipeline. Therefore, strict pipeline isolation measures and explosion-proof protection measures must be taken during pipeline maintenance, resulting in great waste and pollution to the surrounding environment

Images