本文選題：高礦化度 + 多孔介質(zhì)　； 參考：《西南石油大學(xué)》2017年碩士論文

【摘要】：在聚合物驅(qū)中,聚合物溶液的地下黏度是開發(fā)方案設(shè)計、動態(tài)預(yù)測以及數(shù)值模擬最為基本的輸入?yún)?shù)。多孔介質(zhì)中聚合物溶液的流變性研究是正確地進行聚合物驅(qū)油藏工程計算與分析、并指導(dǎo)礦場試驗的前提和基礎(chǔ)。因此,本文選取具有代表性的兩種聚合物:HPAM與P5,以實驗手段研究HPAM與P5溶液在模擬勝利油田油藏條件下的宏觀流變性以及多孔介質(zhì)中的流變性;同時,采用三維物理模擬平板模型,研究HPAM溶液在多孔介質(zhì)中的流變性與驅(qū)油效果的關(guān)系。通過本文研究,可以為聚合物驅(qū)油方案設(shè)計及現(xiàn)場應(yīng)用提供理論和實驗基礎(chǔ)。論文取得了以下研究成果:(1)模擬勝利油田油藏高溫高礦化度油藏條件,開展HPAM與P5溶液的宏觀流變性研究,結(jié)果表明:在85℃及常溫條件下P5溶液的增黏能力強于HPAM溶液;隨濃度增加,P5溶液黏度逐漸上升,當濃度達到2000mg/L時,黏度急劇上升,而HPAM溶液的黏度則隨濃度增加基本呈現(xiàn)線性增加的趨勢。同時,通過冪律模型對HPAM溶液的剪切流變實驗數(shù)據(jù)進行擬合,得到冪律因子與稠度系數(shù)。兩種聚合物溶液的冪律因子都小于1,為非牛頓流體。稠度系數(shù)隨聚合物溶液濃度增加而增大,增黏能力提高。(2)動態(tài)黏彈性研究結(jié)果表明:HPAM與P5溶液的儲能模量和耗能模量隨頻率與濃度的增加而增加,且在實驗濃度及頻率范圍內(nèi),耗能模量始終大于儲能模量,聚合物溶液在外界應(yīng)力作用下能量損耗更大。而當P5溶液濃度達到2500mg/L時,P5溶液的儲能模量超過了耗能模量,溶液以彈性為主。(3)在聚合物溶液流變性及動態(tài)黏彈性研究的基礎(chǔ)上,實驗研究了 HPAM與P5溶液在1.5D與3D左右多孔介質(zhì)中的流變性,研究結(jié)果表明:在多孔介質(zhì)中,P5溶液的滲流阻力大于HPAM溶液,低滲透多孔介質(zhì)中聚合物溶液的滲流阻力更大。P5溶液的阻力系數(shù)隨流速增加基本呈現(xiàn)下降的趨勢,但在部分濃度下,阻力系數(shù)出現(xiàn)了先下降再升高,最后下降的趨勢;HPAM溶液在流速增加的過程中,阻力系數(shù)基本呈現(xiàn)下降趨勢,而當濃度為1000mg/L與2500mg/L的HPAM溶液在滲透率為1.5D的多孔介質(zhì)中滲流時,低注入流量下的HPAM溶液的阻力系數(shù)隨流速增加而增加。無論是P5還是HPAM溶液,殘余阻力系數(shù)都隨注入流量的增加先增加后降低;且在整個注入流量范圍內(nèi),P5溶液的殘余阻力系數(shù)值始終高于HPAM溶液。(4)在三維物理模擬模型中驅(qū)油時,當注入流體流速由1mL/min提高至2mL/min時,聚合物驅(qū)階段含水率開始急劇下降的點提前,最低含水率升高至85.48%,聚合物驅(qū)階段采收率下降至3.32%;在高注入流量下,HPAM溶液的阻力系數(shù)下降,流度控制能力減弱,波及體積減小,說明多孔介質(zhì)中聚合物溶液的流變性與驅(qū)油效果密切相關(guān)。
[Abstract]:In polymer flooding, the underground viscosity of polymer solution is the most basic input parameter of development scheme design, dynamic prediction and numerical simulation. The study of rheological properties of polymer solution in porous media is the premise and foundation of correct calculation and analysis of polymer flooding reservoir engineering and guidance of field test. Therefore, the macrorheological properties and rheological properties of HPAM and P5 solutions in simulated Shengli oil reservoir were studied by means of experiments, and the rheological properties of porous media were studied by using two representative polymers: HPAM and P5. The relationship between the rheological properties of HPAM solution in porous media and the oil displacement effect was studied by using a three dimensional physical simulation plate model. The research in this paper can provide theoretical and experimental basis for polymer flooding scheme design and field application. In this paper, the following research results are obtained: 1) simulating the reservoir conditions of high temperature and high salinity in Shengli Oilfield, and studying the macroscopic rheological properties of HPAM and P5 solutions. The results show that the viscosity increasing ability of P5 solution is stronger than that of HPAM solution at 85 鈩，

本文編號：1895990