【正文】 lso a class of threedimensional structure of highly ordered with traditional polymers, such polymers in the synthesis can be strictly controlled at the molecular level, the design of molecular size, shape, structure and functional groups, the product usually highly symmetric, singledispersion, and thus has a wide range of polymers has developed into the current theoretical and practical value of the new polymer. Flooding in the polymer solution into the process, will experience the injection pumps, injection pipes and equipment, borehole, near wellbore and formation of shear degradation of porous media, leading to the solution viscosity significantly down. As the struc tural peculiarities of polymer in the shear branch has significant outstanding performance,also in the displacement has a broad application space, the study of polymer shear resistance branches has practical significance In this paper, the shear character experiment of HPAM and dendritic polymer has been conducted, using Wuyin stirrer and perforating hole method. The paper studies the rheological behavior of the polymer before and after cutting. The result shows that the viscosity of polymer solution increases as the concentration increases. The viscosity decreases rapidly as the shear rate increases under high shear rate, which demonstrates that the polymer has good shear property. Also, the dendritic polymer solution maintains high viscosity under low shear rate, which could improve the coefficient of fluidity. The result also manifests that the dendritic polymer shows superiority to HPAM in respect of shear resistance. We also use the onedimensional model of fill sand, respectively established residual resistance factor and resistance factor without perforations cut and after cut of dendritic polymers and HPAM ,resulte shows： dendritic polymers before and after cut,there is little difference between the residual resistance coefficient, indicating that the dendritic polymers has excellent shear properties. Keywords ： Dendritic polymers。viscosity。rheological property. Ⅱ 目 錄 摘要 Abstract 1 緒論 ................................................... 1 研究目的及意義 .................................................... 1 研究方法 .......................................................... 1 主要研究內(nèi)容 ...................................................... 1 研究思路 .......................................................... 1 2 樹枝 聚合物 .............................................. 3 樹枝聚合物的概念 .................................................. 3 研究現(xiàn)狀 .......................................................... 3 樹枝聚合物結(jié)構(gòu)特點與性能 .......................................... 4 樹枝聚合物的應(yīng)用 .................................................. 5 3 剪切前后聚合物流變性研究 ................................. 7 實驗條件及步驟 .................................................... 7 實驗條件 ..................................................... 7 聚合物配制 ................................................... 7 剪切方式 ..................................................... 8 聚合物流變性的測定 ........................................... 9 剪切作用對粘度的影響 ............................................. 10 剪切作用對流變性的影響 ........................................... 11 樹枝聚合物 .................................................. 11 HPAM ........................................................ 13 樹枝聚合物與 HPAM 的對比 ..................................... 16 本章小結(jié) ......................................................... 22 4 剪切前后聚合物建立殘余阻力系數(shù)能力研究 ................... 24 阻力系數(shù)與殘余阻力系數(shù)定義 ....................................... 24 實驗條件 ......................................................... 24 操作步驟 ......................................................... 24 剪切前后聚合物建立殘余阻力系數(shù)分析 ............................... 25 未剪切 HPAM 與樹枝聚合物在低滲透巖心中的殘阻實驗 ............. 25 未剪切 HPAM 與樹枝聚合物在高滲透巖心中的殘阻實驗 ............. 26 經(jīng)剪切后 HPAM 與樹枝聚合物在低滲透巖心中的殘阻實驗 ........... 27 經(jīng)剪切后 HPAM 與樹枝聚合物在高滲透巖心中的殘阻實驗 ........... 28 Ⅰ 本章小結(jié) ......................................................... 29 5 結(jié)論及建議 ............................................. 30 結(jié)論 ............................................................. 30 建議 ............................................................. 30 致謝 .................................................... 31 參考文獻(xiàn) ................................................ 32 樹枝聚合物抗剪切性能研究 1 1 緒論 研究目的及意義 驅(qū)油用聚合物溶液在注入過程中，將經(jīng)歷 注聚泵、 注入管線與設(shè)備、 炮眼 、近井地帶 及地層多孔介質(zhì) 的剪切降解作用，導(dǎo)致溶液黏度大幅度下降。炮眼附近的高速剪切和拉伸作用對聚合物溶液提高采收率的影響，受到越來越多研究者重視。 研究方法 本文用到的實驗室模擬剪切裝置主要有以下兩種： （ 1）吳茵攪拌器剪切模擬實驗裝置 實驗室一種較為簡單的攪拌裝置，采用不同轉(zhuǎn)速的旋轉(zhuǎn)攪拌，進(jìn)而對所需樣品達(dá)到機(jī)械剪切的目的。研究表明，孔眼越深，孔眼不滲透段越長 。射孔孔眼不滲透段長度為 80mm。 主要研究內(nèi)容 通過模擬實驗裝置研究樹枝型聚合物剪切前后性能改變情況： 運(yùn)用不同的剪切方式，吳茵剪切、射孔孔眼剪切（炮眼）對樹枝聚合物和 HPAM進(jìn)行剪切，分別測定剪切前后的粘度變化。 分別對射孔剪切前后的樹枝聚合物和 HPAM 建立殘余阻力系數(shù)的研究，得出抗剪切方面的差別。與傳統(tǒng)高分子相比，這類聚合物在合成時，可以在分子水平上嚴(yán)格控制、設(shè)計分子的大小、形狀、結(jié)構(gòu)和功能基團(tuán)，產(chǎn)物一般高度對稱，單分散性好，因而具有廣泛的應(yīng)用前景。 樹枝