本文關(guān)鍵詞： 注入水質(zhì) 低注井治理 二次污染　出處：《東北石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：A油田水驅(qū)開發(fā)在歷經(jīng)一、二、三次加密調(diào)整后,一、二類油層陸續(xù)轉(zhuǎn)為三次采油開發(fā)后,水驅(qū)開采對象主要為三類油層,油層層數(shù)多,滲透率水平低,層間矛盾突出。尤其受含聚污水回注影響,水驅(qū)吸水能力變差井比例逐年增加。盡管加大水質(zhì)治理及注水井措施改造的力度,但由于油層物性差,現(xiàn)有回注污水水質(zhì)與油層適應(yīng)狀況差等因素影響,注水井吸水狀況差的矛盾仍然比較突出。為此,本文通過應(yīng)用現(xiàn)場實際水樣進行室內(nèi)試驗,研究了水質(zhì)對油層滲流能力的影響,結(jié)合現(xiàn)場實際應(yīng)用效果,明確了低注井治理對策。研究結(jié)果表明,注入水質(zhì)越差,滲透率降幅越大,污染程度增加;依據(jù)滲流能力規(guī)律性變化,按照視吸水指數(shù)降幅將油層污染程度劃分為輕度、中度、重度三個級別;輕度污染實施洗井,中度污染適合酸化解堵,重度污染需實施壓裂改造。
[Abstract]:After the first, second and third infill adjustment of water drive development in A Oilfield, the first and second class oil reservoirs have been converted to three oil recovery ones one after another. The main targets of water drive production are three types of oil layers, with more layers and lower permeability levels. The contradiction between layers is prominent. The proportion of wells with poor water absorption capacity increases year by year, especially due to the influence of water reinjection with polymerized sewage. Although water quality control and water injection well reconstruction are strengthened, but due to the poor physical properties of the reservoir, Due to the influence of factors such as poor water quality and reservoir adaptability, the contradiction of poor water absorption in water injection wells is still prominent. The influence of water quality on reservoir percolation capacity is studied. Combined with the practical application effect, the treatment countermeasures of low injection well are determined. The results show that the worse the injection water quality, the greater the permeability decrease and the pollution degree increased. According to the regular change of percolation capacity, according to the decrease of apparent water absorption index, the degree of oil layer pollution is divided into three grades: mild, moderate and severe; the well washing is carried out in light pollution, and the moderate pollution is suitable for acid plugging, while fracturing is necessary for serious pollution.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE357.6
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本文編號：1515707