CAJ | 학술논문

针对常规封堵剂难以对非均质渗透性储层实现有效封堵的难题，基于疏水缔合聚合物的缔合理论，采用共溶剂聚合法，经分子结构优化设计，合成了新型的丙烯酰胺（AM）/十八烷基二甲基烯丙基氯化铵（C18DMAAC）/丙烯酸钠（AANa）疏水缔合共聚物（HMP），采用红外光谱、元素分析和凝胶色谱表征和测定了HMP的分子结构和分子量，并对其作为钻井液封堵剂的可行性进行了探讨。结果表明，新型疏水缔合聚合物HMP的重均分子量小于10万，对钻井液的流变性能影响小，当HMP分子中疏水单体C18DMAAC摩尔含量达到0.66%，且HMP在钻井液中的质量浓度达到0.6%后，其具有优良的封堵性能，在高温高压条件下可以实现对石英砂床和不同渗透率岩心的有效封堵，且形成的封堵层薄而致密；粒度分布测定结果表明，HMP将钻井液体系的粒度分布范围拓宽至几微米到几百微米，并能显著增大体系的平均粒径，这是其具有优良封堵性能的主要原因。
침대상규봉도제난이대비균질삼투성저층실현유효봉도적난제，기우소수체합취합물적체합이론，채용공용제취합법，경분자결구우화설계，합성료신형적병희선알（AM）/십팔완기이갑기희병기록화안（C18DMAAC）/병희산납（AANa）소수체합공취물（HMP），채용홍외광보、원소분석화응효색보표정화측정료HMP적분자결구화분자량，병대기작위찬정액봉도제적가행성진행료탐토。결과표명，신형소수체합취합물HMP적중균분자량소우10만，대찬정액적류변성능영향소，당HMP분자중소수단체C18DMAAC마이함량체도0.66%，차HMP재찬정액중적질량농도체도0.6%후，기구유우량적봉도성능，재고온고압조건하가이실현대석영사상화불동삼투솔암심적유효봉도，차형성적봉도층박이치밀；립도분포측정결과표명，HMP장찬정액체계적립도분포범위탁관지궤미미도궤백미미，병능현저증대체계적평균립경，저시기구유우량봉도성능적주요원인。
In view of the problem that conventional plugging agent cannot realize effective plugging to heterogeneous permeable reservoirs, based on the association theory of hydrophobic associative polymers and using the method of polycondensation in a solvent and through molecular structure optimization design, a new type of hydrophobic associative polymer (HMP) was synthesized of acrylamide (AM)/octadecyl dimethyl allyl ammonium chloride (C18DMAAC)/acrylic acid sodium (AANa). The infrared spectrum, element analysis and gel chromatography were used to represent and measure the molecular structure and molecular weight of HMP, and it’s feasibility of being the drilling lfuid plugging agent was discussed in this paper. Results show that the weight-average molecular weight of the new type of hydrophobic associative polymer (HMP) was less than 100 000, which had small inlfuence on the rheological properties of drilling lfuid. When molar content in hydrophobic monomer C18DMAAC in HMP molecules was up to 0.66% and the mass concentration of HMP in drilling lfuid was up to 0.6%, then it would have excellent sealing performance, and can realize effective sealing of quartz sand bed and cores of different permeability under the condition of high temperature and high pressure and the resulting sealing layer was thin and tight. Results of particle size distribution measurement show that HMP broadens the scope of particle size distribution of drilling lfuid system to a few microns to a few hundred microns, and can signiifcantly increase the average particle size of the system. This is the main reason for its good sealing performance.