无固相高携屑水基钻磨液研究与应用

Research and Application of Water-Based Drilling and Grinding Fluid with No Solid Phase and High Chip Carrying

摘要: 目前现场应用的钻磨液体系大多以瓜胶为主要处理剂，可高温会使其发生热降解，导致钻磨液的粘度、切力明显下降，严重影响桥塞碎屑的井口返出效率，因此构建一套耐高温的高携屑水基钻磨液，对于现场连续油管钻磨桥塞的效率提升有着重要意义。本文通过聚合物分子结构设计、合成原理的研究，得到一种耐温增粘(可达150℃)与抗剪切能力优良的聚合物增粘剂，并以其为核心处理剂构建了一套无固相水基钻磨液。经实验室性能评价与新疆现场试验应用，此钻磨液体系表现出较好的携屑能力和润滑性能，显著地缩短了施工时间，可有效解决现场钻磨液出现的问题。

Abstract: The drilling and grinding fluid system for field application now mostly takes guar gum powder as the main finishing agent, which can easily suffer from thermal degradation at high temperatures. As a result, the viscosity and shearing force of the drilling and grinding fluid will be decreased dramatically, seriously affecting the rising efficiency of bridge plug clast. Therefore, creating a kind of heat-resisting and water-base drilling and grinding fluid with effective carrying capacity is of great significance to improve the efficiency of on-site drilling and grinding of bridge plugs by coiled tubing. Based on the study on the molecular structure design and synthetic principles of polymer, this paper found a polymer tackifier with both heat-resisting performance (up to 150˚C) and excellent shear-resisting capacity. With it as the core finishing agent, the paper constructed a kind of solid-free and water-base drilling and grinding fluid, which showed good carrying capacity and lubricating property according to the laboratory evaluation and filed test application in Xinjiang. It can help shorten the construction period significantly and solve the problems of the current drilling and grinding fluid for field use.