US 6114857 A

 

　　The present invention provides a system and method for in-situ monitoring of corrosion in a conduit which carries fluids that have corrosive effects on the materials utilized for the conduit and/or equipment disposed in the conduit. The conduit may include a well carrying hydrocarbons from subsurface formations or a pipeline transporting hydrocarbons. A cable of sufficient length having a conductor that is susceptible to the corrosive effects of the fluids in the conduit is deployed along a length of the conduit. The conductor is exposed to the fluid continuously or at selected spaced apart locations. The distance of each of the exposed locations from an accessible end is known. A signal generator coupled to the cable induces a pulsed signal into the cable. The transmitted signals are reflected by location on the cable where the impedance differs from the normal impedance. Such locations include each of the exposed conductor locations and the termination point. The reflected signals are received by a receiver and then processed and analyzed by a processor to determine the extent of the corrosion at each of the exposed locations. This information is then used to estimate the nature and extent of the corrosion of components in the wellbore or the pipeline, as the case may be. The cable may be a single conductor cable or a twisted pair of wires, each having a known impedance per unit length.

 

　

　　本发明提供一种用于管道原位腐蚀监测的一个系统和方法，它携带了对所述管道中的导管/或设备的材料有腐蚀作用的液体。该导管可包括从地下地层或管道输送烃类以及携带烃。足够长的电缆导体容易受到管道中流体的腐蚀性影响被沿着管道的长度放置。导体暴露于连续的流体或在选定的间隔开的位置。每个暴露位置中距离可访问的端部的距离是已知的。电缆的耦合信号发生器产生一个脉冲信号到电缆。所传送的信号是通过在那点的阻抗不同于正常阻抗。这样的位置包括每个导体暴露的位置和终止点。接收机接收反射信号，然后处理器进行处理和分析，以确定在每个暴露位置的腐蚀程度。这个信息然后根据具体情况被用于估计部件在井眼或管道中的腐蚀的性质和程度。该电缆可以是单导体电缆或双绞线，每一个都具有每单位长度的一个已知阻抗。