几种有机盐溶液活度及抑制性实验研究

井壁失稳一般都发生在泥页岩、盐岩、弱胶结或未胶结的砂岩及其他破碎性岩石的地层, 最常见且影响严重的是泥页岩地层，导致泥页岩地层失稳的最重要的原因是泥页岩的水化。针对泥页岩在水溶液中的水化程度取决于水溶液的活度，分析了活度与泥页岩水化膨胀的相互关系, 认为对防止泥页岩井壁失稳非常重要。通过吸附等温线的方法测定了Weigh2、Weigh3、YJS-1、YJS-2、KCOOH、NaCOOH、NaCl、KCl、CaCl₂ 的活度，测定了上述产品的抑制膨胀性和抑制分散性，对比分析了盐溶液活度和抑制性的关系。结果表明，根据盐溶液的活度和抑制性，可以通过调节钻井液中不同的盐及其浓度，控制泥页岩水化，达到井壁稳定的目的。

EXPERIMENTAL RESEARCH ON THE ACTIVITY AND INHIBITATION OF SEVERAL TYPES OF ORGANIC SALT SOLUTION

Wellbore Wellbore instability happens commonly in shale,salt rocks,noncementated sandstone or other fractured strata,it is most common and serious in shale.Shale hydration is an important factor for the instability of wellbore.The extent of hydration in aqueous solution of shale lies on the activity of aqueous solution.So,it is important to prevent shale wellbore instability by analyzing relationship between the activity and shale hydration swelling.Authors of this paper measure the activity of Weigh2,Weigh3,YJS-1,YJS-2,KCOOH,NaCOOH,NaCl,KCl,and CaCl2 by adsorption isotherm.The capability of restraining swelling and restraining dispersion is determined.The relation between the activity between salt solution and inhabitation is analyzed.The results show that it can meet the requirement of wellbore stability to control shale hydration by adjusting different salt and salt concentration in drilling fluid.