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滤液减速剂第2部分

  • 作者:Hana王
  • 来源:原来的
  • 发布时间::2021-07-15
(2)流体损失控制剂的原理流体损失控制剂是指可以减少钻井液流体损失的化学试剂。流体损失添加剂大多是水溶性的聚合物化合物,可以通过以下方式降低钻井液的流体损失。
1.如上所述稳定胶体颗粒的作用,钻井液中的粘土颗粒需要具有适当的尺寸分布,并且同时,需要具有更细的粘土颗粒。具有大流体损失的钻井液在一方面具有更粗颗粒,另一方面,细颗粒已被絮凝成粗颗粒,并且有更少的细溶胶颗粒(<100pLm) in the system. The filter cake formed by this drilling fluid with more coarse particles and few fine particles is loose and has large pores, so the filtration loss is large. Fluid loss additives are polymer compounds that can dissociate negatively charged groups in water. On the one hand, it can be adsorbed on the surface of the clay to form an adsorption layer to prevent the flocculation of the clay particles; on the other hand, it can stabilize the fine particles dismantled under the action of the circulating stirring of the drilling fluid through adsorption, and no longer bind into large particles ( Figure 1-5). In this way, a sufficient amount of fine particle ratio can be ensured, so that the drilling fluid can form a thin and dense filter cake and reduce the filtration loss. This effect is also known as the protective glue effect. It is worth noting that the concentration of the fluid loss agent in the drilling fluid must be high enough to help enclose the disassembled clay particles, so that on the one hand, it will bring a higher negative charge density to the surface of the clay particles, increase the f potential, and increase the f-potential. The repulsion between large particles; on the other hand, a thicker hydration film is formed due to the hydration of the hydration group, which makes the clay particles difficult to merge and become larger. If the concentration of the added fluid loss agent is lower than the concentration required for protection, the fluid loss agent will not only have no protective effect on the colloidal particles, but will make the clay particles easier to agglomerate.
2.从静态流体损失方程中已知增加滤液的粘度,并且流体损失与钻井液的滤液的滤液粘度的一半成反比。向钻井液中添加大分子流体损失添加剂可以增加滤液的粘度并降低流体损失。但值得注意的是,粘度的增加将降低钻井速度。因此,通常需要流体损失添加剂不会大大增加粘度。
3.流体损失剂作为高分子化合物流体损失剂的孔隙堵塞效果,其分子大小在胶体颗粒的范围内。添加这些处理剂相当于增加钻井液中胶体颗粒的含量,并且它们阻挡过滤器滤饼。毛孔的作用。这些大分子以两种方式阻止毛孔。让聚合物随机线圈的直径为d。 ,孔径d,。如果0.3D, D,聚合物不能进入孔,但可以阻挡孔入口,称为堵塞,这也可以降低流体损失。