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聚天冬氨酸(PAsp)是一种含有亲水基团的聚合物,无毒、易生物降解。考察了不同相对分子质量M(4×103,2.2×104和1.1×105)的PAsp在不同水基钻井液中的降黏效果,通过表观黏度、降切率、降黏率评价该降黏剂的性能并简要探讨了降黏机理。研究结果表明,在加有两性聚合物FA368的膨润土基浆中,M=2.2×104的PAsp-22降黏效果最佳,加量为0.5%时,表观黏度降低了41.2 mPa.s,降切率、降黏率分别为72.7%、71.8%;在淡水基浆中,PAsp-22的降黏效果最佳,加量为0.06%时表观黏度明显降低,降切率、降黏率分别为69.7%、67.4%;在钙质基浆中,M=4×103的PAsp-4降黏效果最佳,加量为0.6%时表观黏度降至最低,降切率、降黏率分别为84.6%、80.0%。在基浆对比实验中,PAsp的降黏性能优于FCLS,且具有良好的抗温性能,至少可耐温120℃。在用一种井浆进行的等加量(0.1%)对比实验中,PAsp和FCLS都显示良好的降黏效果,PAsp在老化前的降黏率和降切率低于FCLS,120℃老化后则高于FCLS。PAsp是一种可以替代FCLS的绿色水基钻井液降黏剂。图4表5参9。
Polyaspartic acid (PAsp) is a hydrophilic group containing polymer, non-toxic, biodegradable. The viscosity reducing effect of PAsp with different relative molecular mass M (4 × 103, 2.2 × 104 and 1.1 × 105) in different water-based drilling fluids was investigated. The apparent viscosity, cut-off rate and viscosity- Agent properties and briefly discussed the mechanism of viscosity reduction. The results showed that the viscosity reducing effect of PAsp-22 with M = 2.2 × 104 was the best in bentonite-based pulp with amphoteric polymer FA368, and the apparent viscosity decreased by 41.2 mPa.s at 0.5% The cut-off rate and viscosity-reducing rate were 72.7% and 71.8% respectively. In the freshwater pulp, the viscosity-reducing effect of PAsp-22 was the best. Apparent viscosity decreased obviously when the dosage was 0.06% The results showed that the viscosity of PAsp-4 with the molar ratio of M = 4 × 103 was the best, and the apparent viscosity was the lowest at 0.6% 84.6%, 80.0%. Compared with FCLS, the viscosity-reducing property of PAsp is better than that of FCLS in the base-pulp comparative experiment, and has good temperature resistance, at least 120 ℃. PAsp and FCLS showed a good viscosity reduction effect in equal dosage (0.1%) comparison experiment with a kind of well slurry. The viscosity reduction rate and cut-off rate of PAsp before aging were lower than those of FCLS. After 120 ℃ aging Is higher than FCLS. PAsp is a green water-based drilling fluid viscosity reducer that can replace FCLS. Figure 4 Table 5 参 9.