Investigation and application of new amine salt inhibitor

New polyamine salt inhibitor JAI, a buff viscous liquid, was prepared from polyglycol with low molecular weight, metal catalyst, ammonia water, high temperature protection agent and modifier. Experiment results showed that the bentonite pollution capacity for JAI was more than 40% , the rolling recovery through 40 and 28 mesh sieves was of 63. 8% and 51. 2% , respectively, and the clay swelling volume reduced from 9. 8 mL in tap water to 2. 75 mL in JAI solution. The hydration and dispersion of reactive shale were inhibited effectively by JAI, which was comparable to that of foreign product named Ultrahib. The change of temperature at 93-200°C , had little effect on the variation of rolling recovery and pH value, with the average value 63% and 9. 5, respectively. The compatibility between JAI and formate or KC1 salt water drilling fluid was good. The field tests in two wells showed that the inhibition ability of drilling fluids could be enhanced obviously by JAI, and the problems such as sloughing and tight hole were solved efficiently.