本文選題：油井采出水　切入點(diǎn)：N80鋼　出處：《西南石油大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：油管腐蝕己成為制約油氣田發(fā)展的一個(gè)重大問(wèn)題,其中油井采出水對(duì)油管的腐蝕備受關(guān)注。因各油田的采出水組成以及腐蝕環(huán)境的差異,使得相應(yīng)的腐蝕研究具有針對(duì)性。延長(zhǎng)油田某采油廠(chǎng)發(fā)現(xiàn)油管腐蝕問(wèn)題,腐蝕嚴(yán)重的油井處于開(kāi)發(fā)后期,含水率高達(dá)90%左右,有必要研究采出水的腐蝕性及相應(yīng)的防腐措施。以腐蝕嚴(yán)重的4種油井采出水作為研究對(duì)象,首先進(jìn)行水質(zhì)分析;然后運(yùn)用失重實(shí)驗(yàn)討論溫度、溶解氧及腐蝕介質(zhì)流速對(duì)N80鋼腐蝕的影響,并對(duì)腐蝕產(chǎn)物進(jìn)行能譜分析;采用電化學(xué)方法研究溫度、溶解氧、浸泡時(shí)間以及銹層對(duì)N80鋼腐蝕行為的影響;測(cè)試咪唑啉季銨鹽DN5-4、咪唑啉酰胺DTC以及脂肪酸咪唑啉CI-2的溶解性和穩(wěn)定性,并研究它們?cè)?種采出水中的緩蝕性;在1號(hào)和3號(hào)采出水中確定了最佳緩蝕劑濃度、考察了緩蝕劑的陽(yáng)極脫附行為以及后效性;在2號(hào)和4號(hào)采出水中將烏洛托品、硫脲、抗壞血酸、平平加O、十二烷基苯磺酸鈉等分別與CI-2復(fù)配,研究其緩蝕協(xié)同作用;對(duì)具有協(xié)同效應(yīng)的復(fù)配體系進(jìn)一步討論復(fù)配比例、陽(yáng)極脫附以及后效性等問(wèn)題;最后采用動(dòng)態(tài)失重實(shí)驗(yàn)測(cè)試所選緩蝕劑的作用效果。研究結(jié)果表明:溶解氧和流速對(duì)N80鋼腐蝕的影響較大,溫度次之,腐蝕產(chǎn)物主要是鐵的氧化物和FeC03;升高溫度未改變腐蝕機(jī)理,僅加快了腐蝕反應(yīng);氧參與了腐蝕反應(yīng),低頻時(shí)氧濃差擴(kuò)散是反應(yīng)的控制步驟;浸泡17 d后,1、3、4號(hào)采出水中的阻抗值變化較小,腐蝕產(chǎn)物膜穩(wěn)定,2號(hào)采出水中的阻抗值一直較高,腐蝕程度較淺;生銹試樣對(duì)靠近它的未銹試樣有腐蝕加速作用,溫度越高加速作用越大;1號(hào)和3號(hào)采出水中CI-2的緩蝕性好,抑制陽(yáng)極反應(yīng),最佳濃度為1000 ppm,動(dòng)態(tài)失重實(shí)驗(yàn)下的緩蝕率總體高于90%;CI-2在1號(hào)采出水中,過(guò)電位高于0.52 V時(shí)出現(xiàn)輕微的陽(yáng)極脫附,在3號(hào)采出水中沒(méi)有發(fā)生陽(yáng)極脫附,且在兩種介質(zhì)中后效性好;2號(hào)采出水中,CI-2與平平加O按1:1復(fù)配時(shí)有緩蝕協(xié)同作用,協(xié)同系數(shù)為1.26,最佳復(fù)配比例是3:1,過(guò)電位高于0.37V后出現(xiàn)輕微的陽(yáng)極脫附,浸泡8d后仍具有較好的緩蝕性,失重實(shí)驗(yàn)測(cè)得的緩蝕率(除0.8 m/s外)介于92%～98%;4號(hào)采出水中,CI-2分別與硫脲、烏洛托品、抗壞血酸1:1復(fù)配時(shí)有緩蝕協(xié)同作用,協(xié)同系數(shù)分別為2.24、4.97、1.53,最佳復(fù)配比例均為4:1;4號(hào)采出水中,CI-2與抗壞血酸復(fù)配后,當(dāng)過(guò)電位高于0.36 V后部分緩蝕劑出現(xiàn)陽(yáng)極脫附,與硫脲復(fù)配后未出現(xiàn)陽(yáng)極脫附現(xiàn)象,與烏洛托品復(fù)配后,當(dāng)過(guò)電位高于0.5 V后發(fā)生嚴(yán)重的陽(yáng)極脫附;CI-2與硫脲或?yàn)趼逋衅?:1復(fù)配,浸泡8 d后的阻抗值仍然很高,后效性好,CI-2與抗壞血酸復(fù)配后,當(dāng)浸泡7 d后,容抗弧變得很小;4號(hào)采出水中3種復(fù)配方式均能得到普遍高于90%的緩蝕率,但CI-2與硫脲和烏洛托品復(fù)配后,發(fā)生了嚴(yán)重的局部腐蝕,而CI-2與抗壞血酸復(fù)配后表現(xiàn)為均勻腐蝕,故4號(hào)采出水中采用CI-2與抗壞血酸以4:1復(fù)配。
[Abstract]:The corrosion of tubing has become a major problem restricting the development of oil and gas fields, in which the corrosion of produced water from oil wells to tubing has attracted much attention. So that the corresponding corrosion research has pertinence. Yanchang oil production plant found tubing corrosion problem, the corroded oil well is in the late stage of development, the water cut is about 90%, It is necessary to study the corrosion of produced water and the corresponding anticorrosion measures. Taking four kinds of produced water from oil wells with serious corrosion as the research object, the water quality is analyzed first, and then the temperature is discussed by weightlessness experiment. The effects of dissolved oxygen and corrosion medium flow rate on the corrosion behavior of N80 steel were studied by energy dispersive analysis of corrosion products, and the effects of temperature, dissolved oxygen, immersion time and rust layer on corrosion behavior of N80 steel were studied by electrochemical method. The solubility and stability of imidazoline quaternary ammonium salt DN5-4, imidazolinamide DTC and fatty acid Imidazoline CI-2 were tested, and their corrosion inhibition in four kinds of extracted water were studied. The anodic desorption behavior and after-effect of corrosion inhibitor were investigated, and Ulotropine, thiourea, ascorbic acid, Pingping plus O, sodium 12 alkylbenzene sulfonate were mixed with CI-2 in the effluent of No. 2 and No. 4, respectively, to study the synergistic effect of the inhibition on corrosion of Ulotropine, thiourea, ascorbic acid, sodium 12 alkylbenzene sulfonate and so on. The proportion, anodic desorption and after-effect of the complex system with synergistic effect were discussed. Finally, the effect of corrosion inhibitor selected by dynamic weightlessness test was tested. The results showed that dissolved oxygen and flow rate had great influence on corrosion of N80 steel, followed by temperature. The corrosion products are mainly iron oxides and FeC03.The corrosion mechanism is not changed by increasing the temperature, only the corrosion reaction is accelerated, the oxygen is involved in the corrosion reaction, and the oxygen concentration diffusion is the control step of the reaction at low frequency. After 17 days of immersion, the impedance value of water extracted from No. 1 and No. 4 is small, the corrosion product film is stable, the impedance value of No. 2 recovery water is always higher, the corrosion degree is relatively shallow, and the corrosion rate of the rust specimen is accelerated to the unrusted sample near it. The higher the temperature, the greater the acceleration, the corrosion inhibition of CI-2 in No. 1 and No. 3 recovery water is good, the best concentration is 1 000 ppm, and the corrosion inhibition rate of dynamic weightlessness experiment is higher than that of 90% CI-2 in No. 1 recovery water. When the overpotential is higher than 0.52 V, there is slight anodic desorption, no anodic desorption occurs in No. 3 recovery water, and the aftereffects are good in two kinds of medium. The synergistic coefficient is 1.26, the optimum ratio is 3: 1, the anode desorption occurs slightly after overpotential is higher than 0.37 V, and the corrosion inhibition rate (except 0.8 m / s) measured by weightlessness experiment is between 92m/ s and 980.The corrosion inhibition rate measured by weightlessness experiment (except 0.8 m / s) is between 922% and 98%, and CI-2 and thiourea in water from No. 4 recovery water are respectively with thiourea. Ulotropine, ascorbic acid 1: 1 has the synergistic effect of corrosion inhibition, the synergistic coefficient is 2.2444.97 / 1.53 and the optimum ratio is 4: 1.4.The anodic desorption of partial corrosion inhibitor appears when the overpotential is higher than 0.36 V after the combination of CI-2 and ascorbic acid in the recovery water of No. 4. After mixed with thiourea, there was no anodic desorption phenomenon. After mixed with Ulotropine, serious anodic desorption CI-2 and thiourea or Ulotropine 4: 1 were found when the overpotential was higher than 0.5 V, and the impedance value was still very high after 8 days of immersion. After mixing with ascorbic acid for 7 days, the capacitive reactance arc became very small, and the corrosion inhibition rate was higher than 90% in the water of No. 4 recovery, but CI-2 was mixed with thiourea and Ulotropine. Serious local corrosion occurred, and the combination of CI-2 and ascorbic acid showed uniform corrosion. Therefore, CI-2 and ascorbic acid were used in No. 4 recovery water at 4: 1.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TE983

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