【摘要】：隨著人們對環(huán)境治理力度的加大以及原油價格的上漲,煙道氣驅(qū)油技術(shù)有著很大的發(fā)展空間,煙道氣主要含有N2和CO_2,驅(qū)油機(jī)理兼具二氧化碳驅(qū)和氮氣驅(qū)機(jī)理,但是煙道氣具有很強的腐蝕性,會對油氣井內(nèi)的油管、套管等造成腐蝕。因此深入開展注煙道氣的腐蝕機(jī)理及其影響因素和腐蝕規(guī)律的研究,對于保證油氣井的生產(chǎn)壽命具有重要意義。本文模擬煙道氣腐蝕的腐蝕環(huán)境,采用掛片實驗方法,對煙道氣腐蝕進(jìn)行了實驗研究,通過煙道氣腐蝕產(chǎn)物成分分析和腐蝕產(chǎn)物膜分析,闡述了煙道氣腐蝕機(jī)理。同時還研究了溫度、壓力、流速、O_2含量、SO_2含量、SO3含量、HCO3-含量、CO32-含量和Cl-含量對煙道氣腐蝕規(guī)律的影響,利用關(guān)聯(lián)度分析方法,得到各因素對腐蝕速率的影響,影響從大到小為:溫度T、O_2含量、壓力P、SO_2含量、Cl-含量、流速V和HCO3-含量。結(jié)合煙道氣在井筒內(nèi)的流動與傳熱,基于相平衡理論和逸度方程,建立井筒內(nèi)煙道氣酸凝結(jié)的計算模型,研究煙道氣注入井筒的酸凝結(jié)規(guī)律。通過計算模型,得到了煙道氣狀態(tài)參數(shù)和酸凝結(jié)規(guī)律與煙道氣成分(水蒸氣含量、SO_2含量)和注入?yún)?shù)(壓力、溫度、流量)的關(guān)系。依據(jù)模型計算結(jié)果,利用煙道氣腐蝕特性測試裝置進(jìn)行煙道氣對井筒腐蝕的室內(nèi)動態(tài)實驗?zāi)M,研究結(jié)果表明,煙道氣的狀態(tài)逐漸從煙道氣中水蒸氣過熱變?yōu)闊煹罋獬霈F(xiàn)酸凝結(jié),最后煙道氣干度開始下降,井筒腐蝕速率依次變大,因此要提高酸凝結(jié)溫度和干度。設(shè)計N80鋼分別在兩種水型(NaCl和NaHCO_3)下的煙道氣腐蝕正交實驗,以正交實驗得到的實驗數(shù)據(jù)為基礎(chǔ),根據(jù)遺傳算法和BP神經(jīng)網(wǎng)絡(luò)原理,建立N80鋼分別在兩種腐蝕介質(zhì)(NaCl和NaHCO3)下的煙道氣腐蝕速率的BP神經(jīng)網(wǎng)絡(luò)預(yù)測數(shù)學(xué)模型,實現(xiàn)了以實驗數(shù)據(jù)為基礎(chǔ)的煙道氣對N80鋼腐蝕速率的預(yù)測。
[Abstract]:With the increase of environmental control and the rise of crude oil prices, flue gas flooding technology has a great space for development. Flue gas mainly contains N2 and CO_2, oil displacement mechanism, both carbon dioxide and nitrogen drive mechanism. But the flue gas is very corrosive, it will corrode the tubing and casing in oil and gas well. Therefore, it is of great significance to study the corrosion mechanism, influencing factors and corrosion law of flue gas injection in order to ensure the production life of oil and gas wells. In this paper, the corrosion environment of flue gas corrosion is simulated and the corrosion mechanism of flue gas is described by means of composition analysis of flue gas corrosion product and analysis of corrosion product film. At the same time, the effects of temperature, pressure, flow rate and so _ 2 content, so _ 3 content, CO _ 3- content and Cl- content on the corrosion law of flue gas were studied. By using the method of correlation analysis, the influence of various factors on the corrosion rate was obtained. The effects from big to small are as follows: temperature tio _ 2 content, pressure PSO _ 2 content and Cl-content, flow rate V and HCO3- content. Combined with the flow and heat transfer of flue gas in wellbore, based on the theory of phase equilibrium and fugacity equation, the calculation model of acid condensation of flue gas in wellbore is established, and the law of acid condensation of flue gas injected into wellbore is studied. The relationship between the state parameters of flue gas and the law of acid condensation and the composition of flue gas (water vapor content so _ 2 content) and injection parameters (pressure, temperature, flow rate) is obtained by the calculation model. According to the results of model calculation, the indoor dynamic experiment simulation of flue gas corrosion to wellbore is carried out by using the test device of flue gas corrosion characteristics. The results show that, The state of flue gas gradually changed from steam overheating in flue gas to acid condensation in flue gas. Finally the dry degree of flue gas began to decrease and the corrosion rate of wellbore increased in turn. Therefore the acid condensation temperature and dryness should be increased. The orthogonal experiments of flue gas corrosion of N80 steel under two kinds of water types (NaCl and NaHCO_3) were designed. Based on the experimental data obtained from the orthogonal experiment, according to the principle of genetic algorithm and BP neural network, A mathematical model for predicting the corrosion rate of flue gas of N80 steel under two corrosive media (NaCl and NaHCO3) was established by using BP neural network. The prediction of corrosion rate of N80 steel by flue gas based on experimental data was realized.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE983

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李兆敏;張丁涌;李威;秦國順;衣懷峰;薛興昌;麻濤;楊肖曦;;煙氣在井筒中的酸凝結(jié)規(guī)律[J];西安石油大學(xué)學(xué)報(自然科學(xué)版);2014年04期

2 劉東;李云鵬;張風(fēng)義;張雷;張彩旗;;煙道氣輔助蒸汽吞吐油藏適應(yīng)性研究[J];中國海上油氣;2012年S1期

3 郭少強;許立寧;常煒;密雅榮;路民旭;;3Cr管線鋼CO_2腐蝕實驗研究[J];金屬學(xué)報;2011年08期

4 閆偉;鄧金根;董星亮;張春陽;李立宏;袁俊亮;;普通油井管鋼在CO_2和H_2S共存環(huán)境中的腐蝕實驗研究[J];中國海上油氣;2011年03期

5 程峗;任淑霞;劉竟成;宋延璋;王倩;;注蒸汽地面與井筒兩相流壓降及傳熱模型評價[J];重慶科技學(xué)院學(xué)報(自然科學(xué)版);2010年04期

6 馬德勝;王伯軍;吳淑紅;;油氣生產(chǎn)過程中CO_2腐蝕預(yù)測研究[J];西南石油大學(xué)學(xué)報(自然科學(xué)版);2010年03期

7 楊梅;卿曉霞;王波;;基于改進(jìn)遺傳算法的神經(jīng)網(wǎng)絡(luò)優(yōu)化方法[J];計算機(jī)仿真;2009年05期

8 秦永妮;李春福;尤郭群;;高溫高壓下CO_2對N80鋼的腐蝕實驗研究[J];全面腐蝕控制;2008年06期

9 鄧洪達(dá);李春福;王朋飛;;高含H2S和CO_2環(huán)境中L80鋼的腐蝕規(guī)律[J];鋼鐵研究學(xué)報;2008年08期

10 尤郭群;李春福;任海;秦永妮;;N80鋼化學(xué)鍍Ni-Fe-P的抗CO_2腐蝕性能研究[J];化工時刊;2008年05期

相關(guān)博士學(xué)位論文 前1條

1 李春福;油氣開發(fā)過程中的CO_2腐蝕機(jī)理及防護(hù)技術(shù)研究[D];西南石油學(xué)院;2005年

相關(guān)碩士學(xué)位論文 前7條

1 周權(quán);注空氣驅(qū)油過程中的管柱腐蝕與防腐工藝研究[D];中國石油大學(xué);2009年

2 張海寶;油套管二氧化碳腐蝕研究[D];中國石油大學(xué);2008年

3 陳敏;基于BP神經(jīng)網(wǎng)絡(luò)的混沌時間序列預(yù)測模型研究[D];中南大學(xué);2007年

4 李曄;基于一種改進(jìn)遺傳算法的神經(jīng)網(wǎng)絡(luò)[D];太原理工大學(xué);2007年

5 李繼豐;油井管柱抗CO_2腐蝕技術(shù)研究[D];大慶石油大學(xué);2006年

6 于倩秀;陸梁油田生產(chǎn)系統(tǒng)腐蝕規(guī)律實驗研究及腐蝕速率預(yù)測技術(shù)[D];西南石油大學(xué);2006年

7 周計明;油管鋼在含CO_2/H_2S高溫高壓水介質(zhì)中的腐蝕行為及防護(hù)技術(shù)的作用[D];西北工業(yè)大學(xué);2002年

，

本文編號：2243317