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脈沖電流陰極保護(hù)對(duì)油井套管電化學(xué)腐蝕動(dòng)力學(xué)行為影響研究 摘要: 油井套管腐蝕是套損的主要原因。研究結(jié)果表明油井套管采用脈沖電流陰極保護(hù)技術(shù)比傳統(tǒng)直流陰極保護(hù)技術(shù)更優(yōu)越,但缺乏對(duì)脈沖電流條件下油井套管電化學(xué)腐蝕動(dòng)力學(xué)行為機(jī)理的研究阻礙了該技術(shù)的推廣。項(xiàng)目充分考慮到脈沖電流的可調(diào)參數(shù)多,頻率、幅值和占空比均可獨(dú)立調(diào)節(jié),同時(shí)脈沖電流含有交流分量這些特征。首先根據(jù)我國油田現(xiàn)狀,選擇典型地層特征結(jié)構(gòu)油井,按照現(xiàn)有的陰極保護(hù)標(biāo)準(zhǔn)方法,考慮到地層的阻性、容性和感性特征,建立包含套管外壁界面在內(nèi)的套管脈沖電流陰極保護(hù)系統(tǒng)電流回路模型。其次將油井套管脈沖電流陰極保護(hù)的電極系統(tǒng)的相界區(qū)用一個(gè)不漏電的電容器來模擬。分別研究脈沖電流參數(shù)與雙電層特性、套管電位、套管腐蝕電流之間的相關(guān)性,以此研究腐蝕過程的動(dòng)力學(xué)行為。最后通過計(jì)算機(jī)仿真、實(shí)驗(yàn)室模擬實(shí)驗(yàn)和現(xiàn)場應(yīng)用測試研究脈沖電流參數(shù)對(duì)保護(hù)效果的影響規(guī)律,同時(shí)對(duì)套管脈沖電流陰極保護(hù)過程的腐蝕動(dòng)力學(xué)行為理論進(jìn)行完善。 關(guān)鍵詞:油井套管 脈沖電流 陰極保護(hù) 腐蝕動(dòng)力學(xué) |
金蟲 (正式寫手)
雷鋒
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Pulsed current cathodic protection effect on the dynamic behavior of electrochemical corrosion well casing Summary : Well casing corrosion of casing damage is the main reason . The results show that the well casing using pulse current cathodic protection technology than traditional DC cathodic protection technology is superior , but the lack of research on the dynamic behavior of the well casing electrochemical corrosion mechanism under pulsed current conditions hampered the promotion of the technology. Project fully into account many parameters adjustable pulse current , frequency, amplitude and duty cycle can be adjusted independently , and the AC pulse current component comprising these features . First, according to the status quo of China's oil fields, and select the typical characteristics of structure formation wells , cathodic protection in accordance with the existing standard methods , taking into account the resistive, capacitive and inductive characteristics of strata , including the establishment of the interface contains the casing wall sleeve pulse current cathodic protection system current loop model . Second, the phase boundary area well casing electrode pulsed current cathodic protection systems used to simulate left out electrical capacitors . Pulse current parameters were studied with double- layer characteristics , potential casing , casing corrosion current correlation between this study the dynamic behavior of the corrosion process . Finally, through computer simulation , laboratory simulation experiments and field application testing pulsed current parameters on the protective effect , while the casing pulse current cathodic corrosion protection process theory to improve dynamic behavior . Keywords : well casing pulse current cathodic protection corrosion kinetics |

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