AA/AM/AMPS超浓反相乳液聚合合成钻井液降滤失剂的研究

所合成的AA／AM／AMPS三元共聚合超浓反相乳液以白油为外相，可直接用作水基钻井液的降滤失剂。根据2．0％反相孔液在淡水基浆中的降滤失效果，得到了最佳合成条件：单体在水相中的质量分数55％。水相体积分数85％，乳化剂为油相质量的12％，引发剂K2S2O8与单体的摩尔比为0.2％，单体中水化基团（羧酸根，磺酸根）与吸附基团（酰胺基）摩尔比为1：1，实验中为0．75：1。在淡水、盐水、饱和盐水、复合盐水基浆中加入2．0％反相乳液，其API滤失量分别为12.2、14.3、19.5、14.0mL，在150℃滚动老化16小时后分别为13．8、19．2、28．0、16．3mL。该反相乳液稳定性良好，在3000r／min离心分离60min，油相分离率为2．2％，在室温储存3个月。油相分离率为6．0％。图6表1参17。     

Non-oxide CMC fabricated by Fused Filament Fabrication (FFF)

The present study introduces an approach to additively manufacture non-oxidic Ceramic Matrix Composites (CMCs) by the Material Extrusion (MEX)-based Fused Filament Fabrication. Therefore, highly SiC particle filled thermoplastic filaments were developed containing short fibers and/or long fibers to maintain shape during the thermal treatment and exhibiting flaw tolerant behavior. Polymer Infiltration and Pyrolysis (PIP) was applied to densify the microstructure. It is shown that a low content of long fibers of about 5 % can already exhibit damage tolerance comparable to steel reinforced concrete. Thus, the mechanical behavior is different to conventional fiber composites with significant higher fiber volume content. Nevertheless, these results enable new opportunities for producing advanced complex CMC components by means of Additive Manufacturing (AM).     

HP（DMDAAC／AM）对MMA－膨润土泥浆体系的稀释作用

研究了二甲基二烯丙基氯化铵－丙烯酰胺共聚物的水解产物ＨＰ（ＤＭＤＡＡＣ／ＡＭ）对混合金属层状氢氧化物ＭＭＨ－膨润土泥浆体系的稀释作用。通过电性、流变性、滤失性、抑制性及粒度分布的研究，发现ＨＰ（ＤＭＤＡＡＣ／ＡＭ）对ＭＭＡ－膨润土泥浆有较强的稀释能力和一定的降失水作用；含ＨＰ（ＤＭＤＡＡＣ／ＡＭ）的ＭＭＡ－膨润土泥浆对粘土膨胀有很好的抑制性。ＨＰ（ＤＭＤＡＡＣ／ＡＭ）分子在粘土颗粒表面产生多点静电强吸附，破坏了ＭＭＨ与粘土颗粒形成的网状结构．释放出自由水，从而达到稀释效果。