On-line detection method for oil and gas pipeline weld leakage
A technology of oil and natural gas and detection methods, which is applied in the field of oil and gas pipeline leakage detection, can solve the problems of poor real-time performance of detection methods, achieve low power consumption, low-cost real-time detection, and improve the effect of anti-corrosion protection
Active Publication Date: 2016-05-25
BEIJING CNTEN SMART TECH CO LTD
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Problems solved by technology
[0004] In order to overcome the shortcomings of poor real-time performance of existing oil and gas pipeline leakage detection methods, the present invention provides an on-line detection method for oil and gas pipeline weld leakage
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[0019] The following examples refer to Figure 1-2 .
[0020] The specific steps of the on-line detection method for oil and gas pipeline weld leakage of the present invention are as follows:
[0021] On the outer wall of the pipe-pipe welded joint of the oil and gas pipeline 4 that has undergone anti-corrosion treatment, first paint insulating paint, and according to the reinforcement height of the pipeline weld 2, wind and seal at the symmetrical positions on both sides of the outer wall of the oil and gas pipeline 4. Layer 3, and then wrap the stainless steel cladding 1 with a thickness of 0.1-0.5mm around the oil and gas pipeline 4 and then stick it on the sealing layer 3, and then use the capacitive energy storage spot welding process to complete the sealing connection of the stainless steel cladding 1. At this time, the outer wall of the oil and gas pipeline 4 and the inner wall of the stainless steel cladding 1 form the same core column capacitor Cx.
[0022] The Wien...
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Abstract
The invention discloses a leakage on-line detection method for a weld joint of a petroleum and natural gas pipeline, and the method is mainly used for solving the technical problem that an existing leakage detection method of the petroleum and natural gas pipeline is poor in real-time performance. According to the technical scheme, based on the capacitance-type sensor principle, a same core column capacitor is formed by surrounding the petroleum and natural gas pipeline with a stainless steel cladding layer, and by adopting an active bridge circuit suitable for precise capacitance measurement, real-time detection of tiny regional leakage of the weld joint is achieved; a Wien bridge oscillating circuit which is low in power consumption and cost is adopted for producing an excitation carrier signal of a measuring bridge, and low-cost real-time detection of the regional leakage of the weld joint is achieved; by adopting the nearby measuring and pre-warning indication method, influences of parasitic capacitance are effectively eliminated or reduced; by adopting ultrathin stainless steel as cladding layer materials, the anticorrosive and protective effects of the weld joint and nearby regions of connectors are further improved.
Description
technical field [0001] The invention relates to a leakage detection method of an oil and gas pipeline, in particular to an on-line detection method for weld seam leakage of an oil and gas pipeline. Background technique [0002] In the process of pipe-to-pipe welding and heat treatment of oil and gas welded pipes, due to the thermal cycle in the non-equilibrium state, there will be large residual stress and obvious changes in the structure and properties of the welded joints, making it the weak link of oil and gas pipelines . Therefore, real-time monitoring of the pipeline weld area can detect oil and gas leakage in time and avoid major accidents. [0003] The known in-pipe detection method based on magnetic flux, eddy current, camera and other pitching technologies cannot realize online real-time detection; the external detection method based on changes in physical parameters such as pipeline pressure, temperature, flow, sound and vibration, the investment cost is very high...
Claims
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IPC IPC(8): G01N27/22F17D5/06
Inventor 张勇杨思乾马铁军谢红霞
Owner BEIJING CNTEN SMART TECH CO LTD