抗高温降黏剂MHRT的制备及性能评价

Preparation and Properties of High Temperature Water Base Drilling Fluid Thinner MHRT

张龙军 彭 波 林 珍 彭商平

Zhang Long-Jin Peng Bo Lin Zhen Peng Shang-Ping

用丙烯酸和2-丙烯酰胺基-2-甲基丙磺酸为单体合成了低相对分子质量聚合物，再与用二甲胺和环氧氯丙烷共聚合成的阳离子聚合物复配制备了一种抗高温降黏剂MHRT。考察了MHRT在200℃、230℃、250℃下的降黏性能以及基浆中加入MHRT前后的颗粒粒径变化，并测试了MHRT的相对膨胀抑制率。研究结果表明，基浆中加入0.3%MHRT后在250℃下老化16 h的降黏率达到89.6%，8 h后3%MHRT对岩心的相对膨胀抑制率为74%，有效地抑制了高温下黏土的膨胀分散，是取得高温降黏性能的一个关键因素。

The AA/AMPS polymer with low relative molecular weight was synthesized using 2-acrylamino-2-methypropylsufonic acid (AMPS) and acrylic acid as raw materials. And then water-based drilling fluid thinner MHRT was obtained by mixing AA/AMPS polymer with epichlorohydrin-dimethylamine cationic polymer. The reducing viscosity performance of MHRT to the water-based drilling fluid, the particle size of the drilling fluid and the clay swelling before and after adding MHRT, were evaluated. The experimental results showed that HMRT had a good performance below 250℃, the reducing viscosity rate was above89.6% at the temperature of 250℃; the clay swelling inhibition rate of the core was 74% after being soaked in 3% MHRT water solution for 8 h. It was a key factor to improve the heat resistance of thinners that the thinner can inhibit the clay swelling and depression.