本文選題：硫酸鋇 + 結(jié)垢機(jī)理　； 參考：《西南石油大學(xué)》2015年碩士論文

【摘要】：潿西南WZ油田已開(kāi)發(fā)各油藏主力儲(chǔ)層以中孔、中低滲透儲(chǔ)層為主。儲(chǔ)層物性較差,存在較強(qiáng)的敏感性、無(wú)機(jī)結(jié)垢現(xiàn)象突出,在鉆井、完井、采油及修井過(guò)程中易于受到損害,致使許多井達(dá)不到配產(chǎn)要求,嚴(yán)重制約了油田高效開(kāi)發(fā)。但由于結(jié)垢?jìng)臀廴緳C(jī)理不明確,目前還沒(méi)有有效的治理措施。為了有效解決WZ油田低效井治理的問(wèn)題,延長(zhǎng)油田穩(wěn)產(chǎn)期,同時(shí)也為其它油田開(kāi)發(fā)積累一定的經(jīng)驗(yàn)和技術(shù)。本文以理論分析、室內(nèi)實(shí)驗(yàn)、數(shù)學(xué)模擬為主要研究手段,系統(tǒng)深入潿西南WZ油田生產(chǎn)作業(yè)過(guò)程中結(jié)垢機(jī)理、結(jié)垢程度、范圍,除垢機(jī)理與除垢工藝技術(shù)研究,取得的主要認(rèn)識(shí)如下：。 (1)根據(jù)潿西南WZ油田實(shí)際的生產(chǎn)作業(yè)情況,充分利用X衍射、SEM定點(diǎn)掃描、能譜分析以及室內(nèi)動(dòng)態(tài)驅(qū)替等現(xiàn)代先進(jìn)實(shí)驗(yàn)分析手段,深入分析了WZ油田的結(jié)垢類(lèi)型、結(jié)垢機(jī)理。結(jié)果表明,WZ油田注采作業(yè)過(guò)程中均易結(jié)垢,且以硫酸鋇垢為主,并伴隨有一定的碳酸鈣垢。修井作業(yè)過(guò)程中,修井液漏失速度快,結(jié)垢程度更為嚴(yán)重。 (2)針對(duì)修井液漏失流動(dòng)特征,充分考慮成垢離子間的反應(yīng)以及物質(zhì)間的對(duì)流與擴(kuò)散,建立了修井作業(yè)過(guò)程中硫酸鋇結(jié)垢?jìng)?shù)學(xué)模型。結(jié)合室內(nèi)實(shí)驗(yàn)獲得了模型所需基礎(chǔ)參數(shù),可實(shí)現(xiàn)對(duì)硫酸鋇垢?jìng)Τ潭取Ψ秶行ьA(yù)測(cè)。采用飽和指數(shù)法以及ScaleChem軟件對(duì)油田碳酸鈣結(jié)垢趨勢(shì)進(jìn)行了預(yù)測(cè)。結(jié)果表明,硫酸鋇結(jié)垢主要發(fā)生在距井筒半徑1.2米范圍內(nèi)；在儲(chǔ)層條件下,地層水與海水混合碳酸鈣結(jié)垢趨勢(shì)明顯。 (3)針對(duì)WZ油田結(jié)垢特征,充分考慮除垢劑的特點(diǎn),采用溶蝕除垢法與粒徑分析相結(jié)合的方法,篩選了一種具有螯合及分散雙重作用的高效硫酸鋇除垢劑。并采用室內(nèi)動(dòng)態(tài)實(shí)驗(yàn)評(píng)價(jià)了除垢劑-酸液體系綜合除垢效果。結(jié)果表明,除垢劑-酸液體系協(xié)同作用,具有良好除垢效果。 (4)根據(jù)前期的室內(nèi)實(shí)驗(yàn)和模擬結(jié)果,設(shè)計(jì)了一套針對(duì)潿西南WZ油田除垢工藝,并選取WZ-J2井進(jìn)行了現(xiàn)場(chǎng)試驗(yàn),解堵作業(yè)后,油井產(chǎn)量有了顯著提升,驗(yàn)證了配方與工序的可靠性。 本論文完成的研究?jī)?nèi)容以及取得的研究成果,為有效治理WZ油田的無(wú)機(jī)結(jié)垢?jìng)?恢復(fù)提高單井產(chǎn)能,提供了有力的技術(shù)支持。也為解決類(lèi)似油田的復(fù)產(chǎn)提供了可借鑒的 技術(shù)思路。
[Abstract]:The main reservoirs developed in WSW WZ oilfield are medium porosity and low permeability reservoirs. Reservoir physical properties are poor, there are strong sensitivity, inorganic scaling phenomenon is prominent, in drilling, completion, oil recovery and workover process is easy to be damaged, resulting in many wells can not meet the requirements of production, which seriously restricts the efficient development of oil fields. However, due to the unclear mechanism of fouling and pollution, there are no effective control measures. In order to effectively solve the problem of low efficiency well treatment in WZ oilfield, prolong the stable production period of oil field, and accumulate certain experience and technology for other oilfield development at the same time. In this paper, theoretical analysis, laboratory experiments and mathematical simulation are used as the main research methods to study the scaling mechanism, scaling degree, range, scale removal mechanism and scale removal technology of WZ oil field in Wei Southwest China. The main knowledge gained is as follows:. 1) according to the actual production situation of WSW WZ oilfield, the scaling types and scaling mechanism of WZ oilfield are analyzed by using modern advanced experimental analysis methods such as X-ray diffraction SEM fixed spot scanning, energy spectrum analysis and indoor dynamic displacement. The results show that barium sulfate scale is the main scaling during injection and production operation, accompanied by calcium carbonate scale. During workover operation, the fluid leakage rate is fast and the scaling degree is more serious. (2) considering the leakage flow characteristics of workover fluid and considering the reaction between scaling ions and the convection and diffusion between materials, a mathematical model of barium sulfate scaling damage during workover operation is established. The basic parameters of the model are obtained by the laboratory experiments. The damage degree and damage range of barium sulfate scale can be predicted effectively. The saturation index method and ScaleChem software are used to predict the scaling trend of calcium carbonate in oil field. The results show that barium sulfate scaling mainly occurs within 1.2 meters from wellbore radius, and the formation water and seawater mixed calcium carbonate scaling trend is obvious under reservoir conditions. According to the scaling characteristics of WZ oilfield, a high efficiency barium sulfate scale remover with double functions of chelating and dispersing was selected by using the method of corrosion and scale removal combined with particle size analysis, taking full account of the characteristics of scale remover. The scale removal effect of scale removal agent-acid system was evaluated by laboratory dynamic experiments. The results showed that the synergistic effect of scale remover and acid solution system had good scale removal effect. (4) according to the laboratory experiment and simulation results, a set of scale removal technology for WSW WZ oilfield is designed, and the field test is carried out by selecting WZ-J2 well. After plugging removal, the oil well production has been remarkably improved, and the reliability of formula and working procedure has been verified. The research contents and results obtained in this paper provide powerful technical support for the effective control of inorganic scaling damage in WZ oilfield and the recovery and improvement of single well productivity. It can also be used for reference to solve the problem of recurrence of similar oilfields. Technical thinking
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TE358.5

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