酯基钻井液物性及应用研究

PROPERTIES AND APPLICATION OF ESTER-BASED DRILLING FLUID

酯基钻井液是最早应用于现场的合成基钻井液。大量调研结果表明 ,在组成上 ,国外酯基钻井液的配方中大多含有一种低剪切速率流变性调节剂 ;在基液性能上 ,与柴油相比 ,酯基液的闪点较高 ,倾点较低 ,这表明酯不易燃 ,流动性好 ;在环保性能上 ,无论是毒性、生物降解还是蒸气测试结果 ,酯基钻井液均表现出了优良的性能。此外 ,酯基钻井液还具有优良的清洁井眼能力和润滑性能以及特殊的页岩抑制性。使用这种钻井液可以提高钻速 ,节约钻井成本 。

Ester-based drilling fluid (EBDF) is the earliest synthetic-based drilling fluid applied in fields. A large amount of study results indicate that a low-shear rheology modifier is included in most formulas of EBDF provided by foreign investigators. The base fluid of EBDF possesses a higher flash point or less inflammability and lower pouring point or better fluidity in comparison with diesel oil. The test results of toxicity, biodegradability or steam show that EBDF has an excellent hole-clearing ability, lubricity and special shale prohibitive ability. This drilling fluid has the better application results.