Hand-held quick corrosion tester for petroleum pipelines

Abstract

The invention relates to a hand-held quick corrosion tester for petroleum pipelines. The technical scheme is as follows: the signal input ends 3a, 3b of a data collecting unit (3) are correspondingly connected with the output end 2a of a LI-ION battery electric quantity detecting module (2) and the output end 1a of a corrosion sensor (1), and the I / O interface of a singlechip (6) is respectively connected with the ports of the data collecting unit (3), a TFT (thin film transistor) color screen (4), a PC computer (5), a GSM (Global System for Mobile Communications) / GPRS (General Packet Radio Service) module (7), a clock module (8), a keyboard module (9), an electronic tag (10) and a data storage unit (11). The hand-held quick corrosion tester provided by the invention has the advantages of being smart and portable, capable of continuously working for a long time and automatically identifying testing points, high in test response speed, sensitive, accurate in test result, rich in man-machine interface, strong in operability, available for a plurality of storage manners and large in storage capacity, and the testing data are stored in a spreadsheet format and the collected data are remotely transmitted in real time, so that the hand-held quick corrosion tester is suitable for field corrosion detection of petroleum pipelines.

Description

technical field [0001] The invention belongs to the technical field of petroleum pipeline corrosion detection. Specifically relates to a hand-held rapid corrosion tester for oil pipelines. Background technique [0002] With the rapid development of my country's economy, the demand for oil is increasing, and the construction of oil and gas pipelines is also in full swing. The oil and gas transportation industry mainly uses steel pipelines, and the oil contains a high proportion of sulfur, water, oxygen, and other corrosive substances. These substances form an acidic environment and will electrochemically react with the metal pipeline wall. The wall is damaged, and the perforation phenomenon caused by corrosion has brought huge challenges to the safe production, storage and transportation of the petrochemical industry. At the 10th China Petroleum and Petrochemical Engineering Construction Development Summit of the 10th Science and Technology Expo, a set of data provided on...

AI Technical Summary

Problems solved by technology

[0003] At present, the technologies used for oil pipeline corrosion detection in China mainly include: the first is the coupon corrosion detection technology, which mainly calculates the uniform corrosion rate through the quality change of the coupon before and after use; its disadvantage is that the test cycle usually takes several month, and the coupon must be removed from the medium to evaluate corrosion

The second is the resistance corrosion detection technology. This technology is to insert the measuring element in the pipeline. Due to the corrosion of the medium on the measuring element, its cross-sectional area is reduced, resulting in an increase in resistance. By measuring the change in resistance value To calculate the corrosion thinning and corrosion rate of the test piece; its disadvantages are that it is greatly affected by temperature, the test response speed is slow and the resolution is low, and the corrosion must be uniform. If pitting corrosion, stress corrosion cracking or other local In the case of non-corrosive corrosion, the measurement results are prone to deviation

The third is the inductive corrosion detection technology. This technology is to place the metal test piece in the magnetic field generated by the test coil. When the surface sample of the probe becomes thinner due to corrosion and abrasion, the length of the magnetic force line in the air in the coil increases, thus affecting Test the equivalent inductance and inductance of the coil, and calculate the corrosion thinning of the metal test piece by detecting the change in inductance; its disadvantage is that it is greatly affected by temperature, and the test response speed is improved compared with the resistance probe, but it still takes tens of minutes , low resolution

The fourth is the corrosion wall thickness detection technology. This technology mainly uses ultrasonic thickness measurement, but it requires manual operation and cannot obtain real-time wall thickness data. It is greatly affected by the external environment and has low resolution.

[0004] To sum up, the main problems of the above pipeline corrosion detection technology tests are: slow response speed, large equipment that is not easy to carry, and can only be used for on-site online detection

The power supply system, data storage capacity and data transmission involved in the on-site online detection limit the field use of the online corrosion detection system, and most of the oil pipelines are laid in uninhabited areas in the wild. On-line corrosion detection will lead to blind spots in oil pipeline safety

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