Oil gas pipeline leak intelligent on line monitoring method based on distribution type optical fibre sensor

Abstract

The present invention discloses an intelligent on-line monitoring method of oil-gas pipeline leak based on distribution type optical fiber sensor. Near the oil gas pipeline, one or several optical cable is set up parallel to the oil gas pipeline and uses the optical fiber as sensor to proceed real-time monitoring of oil-gas pipeline; at two ends of the optical fiber, that is at the inlet end and outlet end of oil-gas pipeline, a set of luminous power detecting module is equipped at each end and is connected with a computer, the computer is used to proceed analysis of data and obtain the characteristic of pressure change and vibration signal around the pipeline, thereby can discover and accurately determine the position of leak of the oil-gas pipeline.

Description

1. Technical field [0001] The invention belongs to the technical field of signal detection and analysis, relates to an online monitoring method, in particular to an intelligent online monitoring method for oil and gas pipeline leakage based on distributed optical fiber sensors. 2. Background technology [0002] At present, there are many monitoring methods for oil and gas pipeline leakage, mainly through the detection of parameters such as flow and pressure at the input and output ends to determine whether the oil and gas pipeline leaks and its location. For example, when an oil and gas pipeline leaks, due to the pressure difference between the inside and outside of the pipeline, the pressure at the leakage site drops rapidly, and a transient negative pressure wave that propagates upstream and downstream will be generated, according to the propagation speed of the negative pressure wave and the time difference between the two ends. Locate the location of the leak and use the...

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Problems solved by technology

Since the loss of transient negative pressure wave propagation is particularly large, the propagation distance is limited, and the sensitivity of the pressure sensor and flowmeter itself is limited, this method is only suitable for the situation of a large amount of leakage such as pipeline rupture, and has low positioning accuracy, which cannot Disadvantages of Forecasting Spill Hazards

Because of this, there has been a phenomenon of stealing oil and gas by drilling holes on the oil and gas pipeline. Due to the small amount of theft and the long time, even if high-sensitivity pressure sensors and flow meters are used at both ends of the pipeline, it cannot be effectively monitored.

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