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(fā)明提供一種用于管道原位腐蝕監(jiān)測(cè)的一個(gè)系統(tǒng)和方法，它攜帶了對(duì)所述管道中的導(dǎo)管/或設(shè)備的材料有腐蝕作用的液體。該導(dǎo)管可包括從地下地層或管道輸送烴類以及攜帶烴。足夠長(zhǎng)的電纜導(dǎo)體容易受到管道中流體的腐蝕性影響被沿著管道的長(zhǎng)度放置。導(dǎo)體暴露于連續(xù)的流體或在選定的間隔開的位置。每個(gè)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(hào)發(fā)生器產(chǎn)生一個(gè)脈沖信號(hào)到電纜。所傳送的信號(hào)是通過在那點(diǎn)的阻抗不同于正常阻抗。這樣的位置包括每個(gè)導(dǎo)體暴露的位置和終止點(diǎn)。接收機(jī)接收反射信號(hào)，然后處理器進(jìn)行處理和分析，以確定在每個(gè)暴露位置的腐蝕程度。這個(gè)信息然后根據(jù)具體情況被用于估計(jì)部件在井眼或管道中的腐蝕的性質(zhì)和程度。該電纜可以是單導(dǎo)體電纜或雙絞線，每一個(gè)都具有每單位長(zhǎng)度的一個(gè)已知阻抗。