【摘要】：在油氣田開發(fā)中后期,含水率上升,或是注入增產(chǎn)過程,會導(dǎo)致大量無機(jī)鹽垢的生成,嚴(yán)重危害著油田的生產(chǎn)安全。硫酸鹽垢易形成難去除,只能通過阻垢劑來防治這類垢的生成。 本文針對H油田硫酸鹽結(jié)垢的情況,在國內(nèi)外研究現(xiàn)狀調(diào)研的基礎(chǔ)上開展了一系列的研究,取得了以下成果： (1)本論文以綠色阻垢劑為主劑,有機(jī)膦酸類與聚合物類阻垢劑為添加劑進(jìn)行復(fù)配,對7種常用的阻垢劑對硫酸鋇的阻垢性能進(jìn)行了評價,確定了以PESA為主劑,PBTCA與AMPS為添加劑。 (2)運(yùn)用正交實驗方法,確定了主劑與添加劑的濃度比,PESA、PBTCA與AMPS的濃度比為8：1：0.5。LJ-51的pH值為6.3,屬于弱酸性阻垢劑。LJ-51在濃度為8.8mg/L時,即對硫酸鋇有較好的阻垢效果,PBTCA與AMPS的添加,增強(qiáng)了其抗鹽、耐溫等性能,綜合性能優(yōu)于PESA。LJ-51對碳酸鈣也有一定的阻垢效果。對于已經(jīng)生成的硫酸鋇垢,LJ-51幾乎沒有除垢的能力。 (3)LJ-51對于N80鋼片有很好的緩蝕效果,能夠在鋼片表面形成一層致密的保護(hù)膜,防止鋼片被腐蝕,但是所需LJ-51的濃度較大,在100mg/L下才有較好的緩蝕效果。LJ-51中富含螯合基團(tuán),對Ba2+有很強(qiáng)的螯合作用,能夠阻止硫酸鋇晶核的形成,導(dǎo)致晶核的畸變,阻礙垢晶體的生長。 (4)運(yùn)用Oddo-Tomson飽和指數(shù)法與飽和系數(shù)法,對H油田三口井的結(jié)垢進(jìn)行預(yù)測,預(yù)測結(jié)果得到H油田主要結(jié)垢類型都為BaSO4,其沉積在整個井筒及地面管線中。還有生成CaC03與CaSO4的可能,且主要沉積在井底。在溫度為95℃時,LJ-51在油井的最佳使用濃度為10mg/L,且需要添加一定量的PBTCA以提高其對碳酸鈣的阻垢效果,LJ-51與PBTCA使用濃度比為8：2。由三口井的生產(chǎn)曲線分析得到,HS1、HS2、HS3三口油井的日注入LJ-51與PBTCA的量分別為：HS1井543.76g、135.94g,HS2井488g、122g,HS3井177.68g、44.42g。
[Abstract]:In the middle and late stage of oil and gas field development, the increase of water cut or the process of injecting production increase will lead to the formation of a large amount of inorganic salt scale, which will seriously endanger the production safety of oil field. Sulfate scale is easy to form and difficult to remove, so it can only be prevented by scale inhibitor. According to the situation of sulphate scaling in H oil field, a series of researches have been carried out on the basis of domestic and international research status. The following results have been achieved: (1) the main agent of this paper is green scale inhibitor. Organic phosphonic acid and polymer scale inhibitor were used as additives to evaluate the scale inhibition of barium sulfate by seven kinds of scale inhibitors. The main additives were PESA, PBTCA and AMPS were used as additives. (2) the concentration ratio of main agent and additive was determined by orthogonal experiment. The concentration ratio of PESA,PBTCA to AMPS was 6.3 pH of 8:1:0.5.LJ-51. LJ-51 has better scale inhibition effect on barium sulfate when its concentration is 8.8mg/L. The addition of PBTCA and AMPS enhances its salt resistance, temperature resistance, etc. The comprehensive performance is better than PESA.LJ-51 to calcium carbonate also has certain scale inhibition effect. For barium sulfate scale that has been generated, LJ-51 has little ability to remove scale. (3) LJ-51 has good corrosion inhibition effect on N80 steel sheet, and it can form a dense protective film on the surface of steel sheet to prevent the steel sheet from being corroded, but the concentration of LJ-51 required is high. LJ-51 has a strong chelating effect on Ba2, which can prevent the formation of barium sulfate nucleus, lead to the distortion of crystal nucleus and hinder the growth of scale crystal. (4) Oddo-Tomson saturation index method and saturation coefficient method are used to predict scaling in three wells in H oilfield. The results show that the main scaling types of H oil field are BaSO4, which are deposited in the whole well bore and surface pipeline. It is also possible to generate CaC03 and CaSO4, which are mainly deposited at the bottom of the well. At 95 鈩，

本文編號：2396459