【摘要】：對定邊采油廠不同層位產(chǎn)出液水質(zhì)進行了分析,并采用掛片失重法在現(xiàn)場和室內(nèi)對其進行了腐蝕性研究。結(jié)果表明:延長組的產(chǎn)出液分離水多為CaCl_2型,高礦化度腐蝕為主,尤其是Cl-引起的點蝕;延安組產(chǎn)出液分離水多為NaHCO,主要腐蝕原因是SRB引起的細菌腐蝕、硫化氫腐蝕;腐蝕速率隨著油井深度增加而增加,在750~1750 m范圍內(nèi)腐蝕速率增速最快;腐蝕速率隨CO_2含量的增加而增加,對延安組影響更明顯;同一H2S濃度下,p H降低,腐蝕速率升高,高溫(80℃)下H2S濃度200 mg/L時,腐蝕速率最大,低溫(28℃)下隨著H2S濃度增加腐蝕速率增大;腐蝕速率隨著流速的增加而增大,且在0.5 m/s后增速加快。合成了咪唑啉季銨鹽、喹啉季銨鹽和喹啉雙季銨鹽,以季銨鹽為母體緩蝕劑,添加助劑制成三類固體緩蝕劑,并通過溶解性、緩蝕性等性能評價篩選最優(yōu)配方。結(jié)果表明:咪唑啉季銨鹽為25%、WLN10%、分散劑10%、聚乙二醇4000為50%、氯化鈉5%的配方制成的固體緩蝕劑溶出速率最為穩(wěn)定,平均溶出率為0.16 g/h,當其濃度為100 mg/L,溫度60℃,在常壓飽和CO_2產(chǎn)出液分離水中對A3鋼緩蝕率為84.1%。合成了喹啉季銨鹽(KLLHB),對其分散劑、復配助劑進行篩選,同時評價復配緩蝕劑的緩蝕、阻垢、殺菌性能。結(jié)果表明:最佳復配緩蝕劑為KLLHB-Z(15%KLLHB+10%表P9+20%表27+10%WLN+15%ZMP+1%WIK);當KLLHB-Z濃度為50 mg/L,40℃,168小時條件下腐蝕速率為0.0109 mm/a;在濃度分別為200 mg/L、100 mg/L時,阻垢率達到83%、對SRB殺菌率達到100%;加藥濃度在小于150 mg/L的時候,緩蝕效果優(yōu)于中原29#,成本價格只有中原29#的0.48倍。自行設計了油井環(huán)空連續(xù)加藥裝置、注水系統(tǒng)定量加藥裝置,將KLLHB-Z現(xiàn)場應用,用掛片失重法評價應用效果,結(jié)果表明:KLLHB-Z在油井、注水井使用,濃度為200mg/L時,對鋼片的腐蝕速率控制在了0.076 mm/a以下,油井產(chǎn)出液含鐵量下降率平均達到了44.3%。
[Abstract]:The quality of liquid produced in different layers of oil production plant was analyzed, and the corrosion of the liquid was studied in the field and indoor by using the method of weightlessness. The results show that the main reasons for the water separation in Yanchang group are CaCl_2 type, high salinity corrosion, especially the pitting corrosion caused by Cl-, and the main corrosion causes of NaHCO, in Yan'an formation are bacterial corrosion caused by SRB and hydrogen sulfide corrosion. The corrosion rate increased with the increase of oil well depth, and increased with the increase of CO_2 content. The corrosion rate increased with the increase of CO_2 content, and decreased with the concentration of H2S, and the corrosion rate increased at the same H _ 2S concentration, and the corrosion rate increased with the increase of CO_2 content. At high temperature (80 鈩，

本文編號：2207665