本文關鍵詞：一種處理油田壓裂返排液的新方法研究　出處：《沈陽工業(yè)大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 返排液 空化撞擊流 微電解 Fenton氧化

【摘要】：壓裂作業(yè)是油氣田增產(chǎn)的一項重要措施，同時還可以改善油氣層的導流能力，因此被各大油田普遍采用，在作業(yè)結束后產(chǎn)生大量的廢液返回至地面，成為油田當前水體的主要污染源之一。 目前國內外處理壓裂液返排液的方法有固化法、微電解法、生化法、超臨界水氧化法等方法，每種方法單獨使用對廢水處理都不徹底。與其他幾種處理方法相比較，微電解法是一種既經(jīng)濟又高效的處理方法，但微電解法也存在自身的不足，如反應過程中鐵表面容易鈍化，鐵碳容易板結，從而降低了處理效率。為了解決以上問題，本文提出了一套聯(lián)合處理工藝即：氧化破膠-空化撞擊流反應器結合微電解法-Fenton氧化法。 本文把吉林油田1#壓裂液返排液作為研究對象，進行了以下幾方面研究： （1）聯(lián)合工藝處理壓裂液返排液機理研究及水樣污染物分析。由水樣污染物分析可知，，壓裂液返排液的CODCr值高達8910mg/L，固體懸浮物高達236mg/L，含油量高，粘度是水的3倍。 （2）氧化劑篩選。研究發(fā)現(xiàn)，在同等條件下過硫酸銨破膠效果最好，處理后廢水澄清透明，CODCr去除率可達34%。 （3）微電解反應條件實驗研究。確定了微電解最佳反應條件為：初始pH=2、鐵碳質量比為4:1、t=120min。在此條件下CODCr去除率為36.5%。 （4））空化撞擊流結合電解法處理廢水實驗研究。研究結果顯示，在上述反應條件一樣的情況下，改用空化撞擊流反應器，在t=90min時，CODCr的去除率已達到75.8%。 （5）Fenton氧化的最優(yōu)反應條件研究。確定的最優(yōu)反應條件為：30%雙氧水加入濃度為2mL/300mL，pH=3.0，t=60min時。在此條件下CODCr降低率為16.2%。 研究表明該聯(lián)合工藝對壓裂液返排液具有很好的處理效果，經(jīng)處理后廢水總CODCr去除率達到92%。空化撞擊流反應器結合微電解法二者具有很好的協(xié)同作用，與傳統(tǒng)微電解相比，此方法不但使反應時間縮短25%，而且還使CODCr降低率提高5.3%。此外，鐵碳微電解后廢水中含有Fe2+離子，在后續(xù)的Fenton氧化中起催化作用，不必再加入含鐵鹽，可以節(jié)約成本。因此該聯(lián)合工藝為處理壓裂液返排液提供了一種既經(jīng)濟又高效的新方法，具有很廣闊的應用前景，在不久的將來必將會給社會帶來良好的經(jīng)濟效益。
[Abstract]:Fracturing is an important measure to increase production of oil and gas field, and it can also improve the flow conductivity of oil and gas reservoir, so it is widely used in various oil fields, and a large amount of waste liquid is returned to the surface after the operation. It has become one of the main sources of water pollution in oil fields. At present, the methods of treating fracturing fluid back and forth at home and abroad include solidification, microelectrolysis, biochemistry, supercritical water oxidation and so on. Compared with other treatment methods, micro-electrolysis is an economical and efficient treatment method, but micro-electrolysis has its own shortcomings. For example, the surface of iron is easily passivated and the iron and carbon are easily bound in the reaction process, thus reducing the treatment efficiency. In order to solve the above problems. In this paper, a combined treatment process is proposed, that is, oxidation of gel-breaking and cavitation impingement reactor combined with micro-electrolysis and Fenton oxidation. In this paper, the oil field of Jilin oil field fracturing fluid back as the research object, carried out the following aspects of research: From the analysis of water sample pollutants, the CODCr value of fracturing fluid is up to 8910 mg / L. Solid suspensions are as high as 236 mg / L, high in oil and three times as high in viscosity as water. The results showed that ammonium persulfate had the best gel breaking effect under the same conditions, and the removal rate of CODCr was 34. The optimum reaction conditions were determined as follows: initial pH 2, iron-carbon ratio 4: 1. Under this condition, the CODCr removal rate was 36.5%. Experimental study on cavitation impinging current combined with electrolysis for wastewater treatment. The results show that under the same reaction conditions above, cavitation impinging flow reactor is changed to cavitation impinging flow reactor for 90 min. The removal rate of CODCr has reached 75.8%. The optimum reaction conditions of Fenton oxidation were determined as follows: the concentration of 20% hydrogen peroxide was 2 mL / 300 mL ~ (-1) pH ~ (3 +). The reduction rate of CODCr was 16. 2% at 60 min. The study shows that the combined process has a good treatment effect on fracturing fluid reflux. The total CODCr removal rate of treated wastewater is 92%. Cavitation impinging flow reactor and micro-electrolysis have good synergistic effect compared with traditional micro-electrolysis. This method not only shortens the reaction time by 25%, but also increases the CODCr reduction rate by 5.3%. In addition, there is Fe2 ion in the wastewater after iron-carbon micro-electrolysis. In the subsequent oxidation of Fenton, it can save the cost without adding iron salt, so the combined process provides a new economical and efficient method for the treatment of fracturing fluid reflux. It will bring good economic benefits to the society in the near future.
【學位授予單位】：沈陽工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X741

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相關期刊論文 前10條

1 林孟雄;杜遠麗;陳坤;嚴海兵;;復合催化氧化技術對油氣田壓裂返排液的處理研究[J];環(huán)境科學與管理;2007年08期

2 趙德明,史惠祥,汪大

本文編號：1400325