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微凝胶结构的合成聚合物具有突出的滤失控制能力和最小的储层伤害特性,其性能堪与OBM/SBM钻井液体系相媲美。对聚合物结构及流体溶解度的优化可以得到一种多功能、经济有效的滤失控制剂。聚合物所具有的独特微凝胶结构使该聚合物颗粒能够膨胀、堆积,形成薄而致密有效的泥饼。在生产过程中,微凝胶颗粒能够在剪切应力作用下变形,使得该聚合物在地层流体作用下能够有效地从孔隙返出(这比非变形的处理剂更有效),从而降低了对产层的伤害。该聚合物能够对钻井液的流变性产生影响,在所要求的条件下提供较低的剪切黏度。本文给出了室内和现场应用的渗透率恢复数据,从数据可以看出,该有机可溶聚合物钻井液体系对地层伤害很小,从而验证了其有效性。给出了在类似化学结构基础上改进的聚合物的数据,表明该改进聚合物能够在温度更高的极端条件下使用。
The microgel-structured polymers have outstanding filtration control and minimal reservoir damage characteristics, comparable in performance to the OBM / SBM drilling fluid system. Optimization of the polymer structure and fluid solubility can provide a versatile, cost-effective fluid loss control agent. The polymer’s unique microgel structure enables the polymer particles to swell and accumulate to form thin, dense and effective mud cakes. During production, the microgel particles can deform under shear stress, allowing the polymer to effectively back out of the pore (which is more effective than non-deforming treatment agents) by the formation fluid, thereby reducing the need for Production damage. The polymer can affect the rheology of drilling fluids and provide lower shear viscosity under the conditions required. In this paper, the permeability recovery data for indoor and on-site applications are given. It can be seen from the data that the organic-soluble polymer drilling fluid system has little damage to the formation and thus validates its effectiveness. The data for polymers that have been modified on the basis of similar chemical structure are given, indicating that the improved polymer can be used under extreme conditions of higher temperature.