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为了有效地使用聚乙烯醇胶乳油井水泥,采用氯化钠和氯化钙模拟现场水质和工况,应用API标准实验方法研究了其抗盐性能。研究结果表明,随着氯化钠或氯化钙加量的增大,水泥浆的失水量、初始稠度和游离水量逐渐增大,稠化时间逐渐缩短,水泥石的抗压强度和胶结强度略有增长。氯化钠和氯化钙的加量存在拐点值,该值随聚乙烯醇加量的增大而增大,超过该值后,水泥浆失水量急剧增大,当聚乙烯醇加量为0.1%,0.35%和0.7%时,氯化钠加量的拐点值分别约为1%,3%和4%,而氯化钙加量的拐点值则约为1.5%,2.5%和3%。机理分析结果表明,氯化钠和氯化钙主要是通过与聚乙烯醇反应以及介入水泥的水化进程影响水泥浆和水泥石的性能。
In order to effectively use polyvinyl alcohol latex oil well cement, sodium chloride and calcium chloride were used to simulate the in-situ water quality and working conditions, and the salt resistance performance was studied by API standard experimental method. The results show that with the increase of sodium chloride or calcium chloride, the loss of water, initial consistency and free water of cement slurry gradually increase, the thickening time gradually shortens, the compressive strength and cement strength of cement stone slightly There is growth. NaCl and calcium chloride addition point inflection point value, the value increases with the increase in the amount of polyvinyl alcohol, after more than this value, the loss of water slurry increased dramatically, when the amount of polyvinyl alcohol 0.1 The inflection points for the addition of sodium chloride were about 1%, 3% and 4%, respectively, while the inflection points for the addition of calcium chloride were about 1.5%, 2.5% and 3% respectively. The mechanism analysis shows that sodium chloride and calcium chloride affect the performance of cement paste and cement stone mainly through the reaction with polyvinyl alcohol and the hydration process involved in the cement.