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On April 8th, the Technical Monitoring Center delivered the electromagnetic eddy current internal detector at the Honglian Combined Station of the Honglian Oil Production Center in the Turpan Oil Production Management Area and successfully completed the detection target. It lasted for 22 hours and 18 minutes, with a journey of 47.5 kilometers. With the full cooperation of the Turpan Oil Production Management Area, the electromagnetic eddy current internal detector was successfully retrieved at the end of the pipeline. The structure of the detector is complete, and the leather cup is slightly worn. After a preliminary analysis of the detection data, the results are promising, marking the successful first application of the electromagnetic eddy current internal detection technology in Tuha Oilfield.
Before the eddy current internal detection, the inspectors connected the detection equipment and checked the integrity of the eddy current equipment to get ready for the launch. (Photo by Wang Jiafeng.)
The crude oil external transportation pipeline from Honglian to Shanshan Oil Depot was built in 2007, with a pipe diameter of 273 millimeters, an operating pressure of 4.2 MPa, and a daily transportation volume of 2,600 cubic meters of crude oil. This pipeline has been in service for 17 years, and it is urgently needed to conduct internal pipeline detection to understand the internal corrosion situation of the pipeline. However, due to its early construction time, the pipeline receiving and launching cylinders do not meet the requirements of the length and site of the receiving and launching cylinders of the magnetic flux leakage internal detection (MFL) standard.
In the face of the current situation of early design and construction time, low pressure, small flow rate, and mostly small pipe diameters of the internal pipelines in the oilfield, the Technical Monitoring Center closely follows the technological frontier, continuously conducts technological upgrading and iteration, actively explores and introduces methods that can complement the conventional magnetic flux leakage detection. It strives to overcome difficulties such as many impurities and much wax deposition, actively optimizes and communicates the detection plan, and successfully completes the detection task by applying the electromagnetic eddy current internal detection technology for the first time, providing a scientific and brand-new means for the detection of internal corrosion defects in the in-service crude oil external transportation pipelines.
To ensure the safe and smooth completion of this detection operation, the center has organized two safety and technical disclosure exchange meetings successively, carefully studied and deployed to refine the operation procedures, established a communication platform, broke through the communication barriers between the Pipeline Integrity Detection and Evaluation Center, the Production Operation Department and the Oil Production Management Area, combined with the pipeline construction and current situation, earnestly explored and discussed the feasibility of technical measures for each operation, judged the operation risks, and with a rigorous attitude and pragmatic style, precisely optimized and implemented various preparations such as scheme review and process condition inspection. At the same time, full discussions and research were conducted on key contents such as pipeline pressure and detector speed control to prepare for the smooth implementation of the detection operation.
In the next step, the Technical Monitoring Center will continuously conduct systematic analysis of the detection data and conduct excavation verification based on the detection results. According to the excavation situation to verify the results, it will be further applied in the section from No. 3 station to the end station of the Santang Lake crude oil external transportation pipeline with more wax deposition and the large-diameter pipeline of the gas storage with super-high transportation pressure to ensure effectively improving the service life of oil and gas pipelines under special working conditions and escorting the safe operation of oil and gas pipelines in the oilfield.
