本文關(guān)鍵詞：華北油田京11區(qū)塊弱堿復(fù)合驅(qū)結(jié)垢規(guī)律及防治技術(shù)研究　出處：《中國石油大學(xué)(華東)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 結(jié)垢 預(yù)測 結(jié)垢機理 阻垢劑 阻垢機理 分子動力學(xué)模擬

【摘要】：油田注水開采過程中地層和設(shè)備結(jié)垢是開發(fā)過程中遇到的主要問題之一,而對于采用弱堿復(fù)合驅(qū)技術(shù)的華北油田京11區(qū)塊這一問題尤為突出。本論文結(jié)合理論預(yù)測、靜態(tài)實驗以及計算機分子模擬方法針對京11區(qū)塊的結(jié)垢問題及防治技術(shù)進(jìn)行了系統(tǒng)研究。首先根據(jù)京11區(qū)塊的水質(zhì)分析結(jié)果,采用飽和指數(shù)法和穩(wěn)定指數(shù)法預(yù)測了地層水和注入水的結(jié)垢趨勢,結(jié)果表明兩種水樣都具有嚴(yán)重的碳酸鈣垢結(jié)垢趨勢,并且結(jié)垢趨勢隨著溫度和碳酸鈉含量的增加而增大,兩種水樣都沒有硫酸鈣垢結(jié)垢趨勢。為了驗證理論預(yù)測的正確性,明確結(jié)垢規(guī)律和結(jié)垢機理,本文采用靜態(tài)結(jié)垢實驗方法,研究了水樣結(jié)垢規(guī)律及其影響因素。實驗結(jié)果表明,溫度升高、pH值增大、鈣離子濃度增大、碳酸鈉含量增加都會使水樣結(jié)垢率增加,XRD分析結(jié)果表明垢的主要成分為碳酸鈣,水樣的結(jié)垢機理為溫度等熱力學(xué)參數(shù)變化引起溶液中鹽類溶解度變化而結(jié)垢。在明確了所結(jié)垢為碳酸鈣垢之后,針對碳酸鈣垢進(jìn)行了阻垢劑篩選評價研究。采用靜態(tài)防垢實驗,研究了聚天冬氨酸(PASP)、聚丙烯酸(PAA)、二乙烯三胺五甲叉膦酸(DTPMP)、羥基乙叉二膦酸(HEDP)四種阻垢劑在實際工況條件下的阻垢率。研究發(fā)現(xiàn)阻垢率:HEDPDTPMPPAAPASP。HEDP在濃度超過2mg/L之后阻垢率超過95%,當(dāng)溫度升高到90℃后,阻垢性能急劇下降,另外,鈣離子和碳酸鈉濃度增大都會使HEDP阻垢率降低,為了滿足弱堿復(fù)合驅(qū)防垢要求,實驗得出,HEDP阻垢劑在濃度超過20mg/L時阻垢率可以滿足碳酸鈉濃度20g/L時條件下的防垢要求。為了解釋阻垢劑的阻垢機理,本論文采用分子動力學(xué)方法研究了阻垢劑分子與垢晶體表面的相互作用。計算了靜態(tài)實驗所用四種阻垢劑分子與碳酸鈣晶體(104)面和(11_0)面的結(jié)合能、阻垢劑分子形變能以及阻垢劑分子中氧原子和碳酸鈣表面鈣離子的徑向分布函數(shù)。研究發(fā)現(xiàn)結(jié)合能大小順序為:HEDPDTPMPPAAPASP,與實驗所得阻垢率大小順序一致,說明相互作用越強,阻垢性能越好,并且四種阻垢劑的形變能都小于其對應(yīng)結(jié)合能,因此阻垢劑分子會在垢表面的吸附作用下發(fā)生形變,緊密附著在垢表面,徑向分布函數(shù)研究結(jié)果表明,HEDP和DTPMP阻垢機理為羥基氧原子與鈣離子的螯合作用為主,PAA和PASP阻垢機理羰基氧原子與垢表面鈣離子靜電相互作用。
[Abstract]:Formation and equipment scaling is one of the main problems in oilfield water injection production. However, the problem of Jing11 block in Huabei Oilfield based on weak alkali composite flooding technology is particularly prominent. The static experiment and computer molecular simulation are used to study the scaling problem and prevention technology of Jing11 block systematically. Firstly, according to the water quality analysis results of Jing11 block. The saturation index method and stability index method are used to predict the scaling tendency of formation water and injected water. The results show that both water samples have serious scaling tendency of calcium carbonate. And the scaling trend increases with the increase of temperature and sodium carbonate content, the two kinds of water samples have no scaling trend. In order to verify the correctness of theoretical prediction, the scaling law and scaling mechanism are clear. In this paper, the scaling law of water sample and its influencing factors are studied by using static scaling experiment method. The results show that the pH value increases and the calcium ion concentration increases with the increase of temperature. The increase of sodium carbonate content will increase the scaling rate of water samples. XRD results show that the main component of scale is calcium carbonate. The scaling mechanism of the water sample is that the change of the solubility of salt in the solution caused by the change of thermodynamic parameters such as temperature. The selection and evaluation of scale inhibitor for calcium carbonate scale were studied. The static scale inhibition experiment was used to study the polyaspartic acid (PASPN) and polyacrylic acid (PAA). Diethylenetriamine pentamethylphosphonic acid (DTPMP). Hydroxy ethylenediphosphonic acid (HEDP). The scale inhibition rate of four kinds of scale inhibitors under actual operating conditions. It was found that the scale inhibition rate was over 95% after the concentration of 2 mg / L was more than 2 mg / L in the scale inhibition ratio: HEDPDTPMPPA ASP. Net HEDP. When the temperature rises to 90 鈩，

本文編號：1435546