本文關鍵詞： 注水開發(fā) 硫酸鋇 結垢預測 解堵效果 溶垢機理　出處：《西南石油大學》2015年碩士論文　論文類型：學位論文

【摘要】：本文通過對姬塬油田儲層巖心的孔滲測試及壓汞分析認為,該油田儲層孔隙度小、滲透率低、孔隙喉道類型主要為小孔隙、微喉道,屬于典型的低滲油田。姬塬油田注入水中S042-離子含量高,地層水中Ba2+、Sr2+離子含量高,在注水過程中儲層極易產(chǎn)生硫酸鋇。在注水開發(fā)過程中一旦產(chǎn)生硫酸鋇、硫酸鍶垢,將對儲層的滲流能力產(chǎn)生嚴重的影響。因此,研究硫酸鋇垢的溶垢機理及溶垢效果,對油田增產(chǎn)、穩(wěn)產(chǎn)具有十分重要的意義。 本文以姬塬油田長8油藏水分析資料為基礎,通過結垢理論預測研究和實驗研究,分析不同混合比下的結垢類型及其結垢量的變化趨勢。并通過X-衍射分析及酸溶實驗分析可知,本區(qū)塊垢型主要為硫酸鹽垢。 采用紅外光譜分析儀及核磁共振儀對溶垢劑YHJD-1的溶垢機理進行了測試分析,分析認為溶垢劑YHJD-1的溶垢機理是其中的氨羧基團與金屬離子絡合生成螯合物,促進垢的溶解,從而達到溶垢的目的。本文通過新的測定螯合型溶垢劑溶垢率的方法研究了溶垢劑濃度、溶垢時間、溫度和pH值對硫酸鋇溶垢效果的影響。分析可知,當溶垢劑YHJD-1濃度為9%,反應時間為24h時溶垢率達到82.41%；隨著溶垢時間的增加、溶垢溫度的升高以及pH值的升高,溶垢劑的溶垢率逐漸增大,通過該方法測得的溶垢率更加準確。 文中通過巖心流動實驗研究了不同注入混合比、溶垢劑類型、溶垢劑濃度及溶垢劑用量對巖心解堵效果的影響。分析可知,各因素對解堵效果均有一定的影響,解堵后巖心滲透率得到了不同程度的提高,為姬塬油田解堵方案的制定提供了可靠的理論依據(jù)。
[Abstract]:Based on the pore permeability test and mercury injection analysis of the reservoir core in Jiyuan Oilfield, this paper concludes that the reservoir porosity is small, the permeability is low, and the pore throat type is mainly small pore and microthroat. It is a typical low permeability oil field. The injected water of Jiyuan oilfield has high S042-ion content and the formation water has high Ba2 Sr2 ion content. The reservoir is prone to produce barium sulfate in the process of water injection. Once barium sulfate is produced in the process of waterflooding, the strontium sulfate scale is produced. Therefore, it is of great significance to study the scale dissolution mechanism and scale dissolution effect of barium sulfate scale for increasing oil production and stabilizing production. Based on the water analysis data of Chang 8 reservoir in Jiyuan Oilfield, this paper is based on the theoretical prediction and experimental study of scaling. The scaling types and the changing trend of scaling amount under different mixing ratios are analyzed. The results of X- diffraction and acid dissolution experiments show that the scale type of the block is mainly sulfate scale. The scale dissolution mechanism of scale dissolving agent YHJD-1 was tested and analyzed by infrared spectrum analyzer and nuclear magnetic resonance analyzer. It was concluded that the scale dissolution mechanism of scale dissolving agent YHJD-1 was that the ammonia carboxyl group complexed with metal ions to form chelates, which promoted the dissolution of scale. In this paper, the effects of concentration, time, temperature and pH value on the scale dissolution effect of barium sulfate were studied by a new method to determine the scale dissolution rate of chelating scale solubilizer. When the concentration of YHJD-1 was 9 and the reaction time was 24 hours, the scale dissolution rate reached 82.41. With the increase of scale dissolution time, the scale dissolution temperature and pH value increased, the scale dissolution rate of scale solubilizer gradually increased, and the scale dissolution rate measured by this method was more accurate. In this paper, the effects of different injection mixing ratio, scale solubilizing agent type, scale solubilizing agent concentration and scale dissolution agent dosage on the plugging removal effect of core are studied by core flow experiment. The analysis shows that each factor has certain influence on the plugging removal effect. The core permeability has been improved in varying degrees after plugging removal, which provides a reliable theoretical basis for the formulation of plugging removal scheme in Jiyuan Oilfield.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE358

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