【摘要】：目前塔河油田主要使用液力反饋泵對稠油進(jìn)行摻稀降黏生產(chǎn),生產(chǎn)過程中出現(xiàn)了井口黏度波動大、懸點(diǎn)載荷波動大以及抽油桿斷脫嚴(yán)重等問題,造成這些問題的主要原因是摻稀過程中稠油和稀油相互混合不均勻。為了能夠直觀地顯示摻稀降黏過程中稠油與稀油的混合效果,本文采用數(shù)值模擬方法對光管環(huán)空摻稀以及加入靜態(tài)混合器之后的環(huán)空摻稀過程進(jìn)行了研究。 首先,利用Gambit軟件進(jìn)行建模,并使用計(jì)算機(jī)流體力學(xué)軟件Fluent對光管環(huán)空摻稀以及加裝了SK型和SD型靜態(tài)混合器的環(huán)空摻稀過程進(jìn)行了數(shù)值模擬,得到了混合油在以上三個(gè)模型中外部條件相同情況下的混合結(jié)果,并進(jìn)行了對比和分析。結(jié)果表明,加入靜態(tài)混合器能夠提高混合油的均勻程度,能夠提高摻稀降黏的效果。 其次,對SK型及SD型靜態(tài)混合器摻稀效果進(jìn)行對比分析,結(jié)果表明在混合元件數(shù)量相同的條件下,SK型靜態(tài)混合器的降黏效率要優(yōu)于SD型靜態(tài)混合器；而且SK型靜態(tài)混合器元件可靠性更好,造成的壓力損失也更小。 最后,對SK型靜態(tài)混合器進(jìn)行了元件排列角度敏感性分析,分析表明SK型混合元件兩兩90°角對接下入油管中造成的壓降最小,混合效率最高。并對優(yōu)化后的混合器模型進(jìn)行了摻稀比敏感性分析,得到結(jié)論：摻稀比越大,混合油的黏度越低,降黏效果越好。在使用SK型靜態(tài)混合器時(shí),推薦使用的摻稀比為0.5。 本文的研究結(jié)果為加深對稠油環(huán)空摻稀降黏工藝的理解提供了參考,也對提高混合效果、減少或消除由于混合不均勻所導(dǎo)致的黏度波動大、懸點(diǎn)載荷波動大等生產(chǎn)問題有一定的指導(dǎo)意義。
[Abstract]:At present, the hydraulic feedback pump is mainly used in the production of viscous oil with dilute viscosity reduction. During the production process, there are some problems such as large fluctuation of wellhead viscosity, large fluctuation of suspended load and serious break off of sucker rod, etc. The main reason for these problems is that the heavy oil and the thin oil are mixed inhomogeneously. In order to visualize the mixing effect of heavy oil and thin oil in the process of mixing dilute viscosity reduction, the mixing process of thin ring space and that after adding static mixer is studied by numerical simulation method in this paper. Firstly, Gambit software is used to model the model, and fluent is used to simulate the process of optical tube ring dilute and SK type and SD type static mixer. The mixing results of the mixed oil under the same external conditions in the above three models are obtained and compared and analyzed. The results show that the addition of static mixer can improve the uniformity of the mixture oil and the effect of dilute viscosity reduction. Secondly, the mixing effect of SK type and SD type static mixer is compared and analyzed. The results show that the viscosity reduction efficiency of SK-type static mixer is better than that of SD type static mixer under the same number of mixing elements. Besides, SK static mixer has better reliability and less pressure loss. Finally, the sensitivity analysis of the array angle of SK static mixer is carried out. The results show that the pressure drop is the least and the mixing efficiency is the highest when the SK type mixing element is docked at 90 擄angle. The sensitivity analysis of the optimized mixer model shows that the higher the blending ratio is, the lower the viscosity of mixed oil is and the better the viscosity reduction effect is. When using SK static mixer, the recommended dilution ratio is 0.5. The results of this paper provide a reference for further understanding of viscous oil annular viscosity reduction technology, and also improve mixing effect and reduce or eliminate the viscosity fluctuation caused by uneven mixing. The production problems such as heavy load fluctuation at suspension point have certain guiding significance.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE937

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