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.

 

　

　　本發明提供一種用于管道原位腐蝕監測的一個系統和方法，它攜帶了對所述管道中的導管/或設備的材料有腐蝕作用的液體。該導管可包括從地下地層或管道輸送烴類以及攜帶烴。足夠長的電纜導體容易受到管道中流體的腐蝕性影響被沿著管道的長度放置。導體暴露于連續的流體或在選定的間隔開的位置。每個暴露位置中距離可訪問的端部的距離是已知的。電纜的耦合信號發生器產生一個脈沖信號到電纜。所傳送的信號是通過在那點的阻抗不同于正常阻抗。這樣的位置包括每個導體暴露的位置和終止點。接收機接收反射信號，然后處理器進行處理和分析，以確定在每個暴露位置的腐蝕程度。這個信息然后根據具體情況被用于估計部件在井眼或管道中的腐蝕的性質和程度。該電纜可以是單導體電纜或雙絞線，每一個都具有每單位長度的一個已知阻抗。