本文選題：HGY-9BS + 注水��； 參考：《華中科技大學(xué)》2015年碩士論文

【摘要】：隨著油田的開采進(jìn)入中后期,注水驅(qū)替提高采收率是大多數(shù)陸地油田的主要手段之一。但這種方法在注水的過程中,外來注入的流體與油田油氣層的巖石和地下原有水體接觸,會(huì)發(fā)生各種物理、化學(xué)變化,造成產(chǎn)出水的水質(zhì)變化,再注入井下時(shí)產(chǎn)生了嚴(yán)重的結(jié)垢趨勢,嚴(yán)重影響了油田的正常連續(xù)生產(chǎn),因此研究油田注水系統(tǒng)結(jié)垢的趨勢和應(yīng)對措施對油氣田的生產(chǎn)有重要實(shí)際應(yīng)用價(jià)值。本論文探討了在勝利油田現(xiàn)場注入水的環(huán)境下,N80鋼和20#鋼的結(jié)垢趨勢;以動(dòng)態(tài)模擬的方式獲得了垢層厚度隨時(shí)間變化以及垢層厚度增長率隨進(jìn)管口流速變化的關(guān)系;還研究了動(dòng)態(tài)模擬狀態(tài)下HGY-9BS緩蝕阻垢劑的阻垢效力和失效規(guī)律,為現(xiàn)場生產(chǎn)提供建議。對于N80鋼和20#鋼在現(xiàn)場水中結(jié)垢趨勢的研究發(fā)現(xiàn),隨著溫度的升高,N80鋼和20#鋼的腐蝕和結(jié)垢均加重,且垢層增厚;動(dòng)態(tài)模擬實(shí)驗(yàn)發(fā)現(xiàn),現(xiàn)場水常壓環(huán)境下垢層厚度隨時(shí)間變化的規(guī)律與鋼材的種類和鋼材表面粗糙度的關(guān)系不明顯;在一定范圍內(nèi),同一條管線相同流量下,湍流動(dòng)能越大的區(qū)域結(jié)垢薄而緊密,湍流動(dòng)能越小的區(qū)域結(jié)垢厚而疏松,鋼片表面垢層最大增長速率與進(jìn)管口流速的關(guān)系為:最大垢層增長率(μm/h)=1.1222×進(jìn)管口流速v(m/s)+0.5417(v≤1.5m/s),當(dāng)進(jìn)管口流速超過一定范圍時(shí),對管壁沖刷嚴(yán)重,造成垢層厚度較為隨機(jī)和不穩(wěn)定,不易預(yù)測。同時(shí)還建立了實(shí)驗(yàn)條件下垢層厚度的函數(shù)模型,并對函數(shù)關(guān)系進(jìn)行了簡單圖像表示。HGY-9BS緩蝕阻垢劑在動(dòng)態(tài)實(shí)驗(yàn)中表現(xiàn)出良好的阻垢效率,長達(dá)9天的動(dòng)態(tài)實(shí)驗(yàn)中最大垢層厚度不超過500μm,最小的厚度不足100μm,實(shí)際阻垢效率約50%左右;該緩蝕阻垢劑還具有一定的增溶作用和畸變晶格作用,在鋼片表面形成保護(hù)膜防止腐蝕的同時(shí)還能阻礙晶體沉積以及畸變垢的晶格,造成鋼片表面的垢強(qiáng)度較低易于脫落。但是HGY-9BS緩蝕阻垢劑在60℃現(xiàn)場水的環(huán)境下48h失去阻垢效力,現(xiàn)場應(yīng)及時(shí)監(jiān)測HGY-9BS的有效濃度,以便確定加注周期。
[Abstract]:Water flooding is one of the main methods to improve oil recovery in most terrestrial oilfields. However, in the process of water injection, all kinds of physical and chemical changes will occur when the injected fluid contacts with the oil and gas reservoir rocks and the original water body of the oil field, resulting in the change of the water quality of the produced water. When injected downhole, serious scaling trend is produced, which seriously affects the normal and continuous production of oil field. Therefore, it is of great practical value to study the scaling trend and countermeasures of oilfield water injection system in oil and gas field production. In this paper, the scaling tendency of steel N80 and steel 20 # in Shengli Oilfield is discussed, and the relationship between the thickness of scale layer with time and the growth rate of thickness of scale layer with inlet velocity is obtained by dynamic simulation. The scale inhibition effect and failure rule of HGY-9BS corrosion and scale inhibitor under dynamic simulation state were also studied, which provided suggestions for field production. The research on scaling trend of N80 steel and 20 # steel in field water shows that the corrosion and scaling of N80 steel and 20 # steel increase with the increase of temperature, and the scale layer is thickened, and the dynamic simulation experiment shows that the corrosion and scaling of N80 steel and 20 # steel increase with the increase of temperature. The relationship between the thickness of scale layer with time and the type of steel and the roughness of steel surface is not obvious under the environment of water pressure, and in a certain range, under the same flow rate of the same pipeline, the area with larger turbulent kinetic energy is thin and compact. The smaller the turbulent kinetic energy is, the thicker and looser the scaling is. The relationship between the maximum growth rate of the scale layer on the steel sheet surface and the inlet velocity is 1.1222 脳 1. 1222 脳 inlet velocity v (m / s) 0.5417 (v 鈮，

本文編號：2051272