正电胶—聚合物钻井液的室内研究与现场应用

本文介绍了正电胶-聚合物钻井液的配方组成、室内性能测试结果和现场应用实例。正电胶与聚合物复配使用时有很好的互补性，得到的钻井液抑制能力强，失水造壁性好，动塑比高，卡森极限粘度低，能显著提高泥页岩稳定性，清洁井眼，提高机械钻速，应用于定向井取得了成功。这是一种实用价值很高的钻井液。

LABORATORY STUDIES AND FIELD USES OF MMH/POLYMER DRILLING FLUID

This paper presents the composition, properties and field uses of a MMH/amphoteric polymer drilling fluid,which is composed of 3-4% Na-bentonite, 0.1-0.3% BY-I, an amphoteric polymer, 0.2-0.4%JN-I, a MMH, and 3-5% FRH-B, an anticaving/lubricating agent. The MMH and Polymer (encapsulating agent) in combination compensate each other in behavior and the drilling fluid thus formulated is highly inhibitory, has good filtration and wall-building Promptes, high ratio YP/PV, and low Casson's limiting visosity. With this drilling fluid high shale stabilization, clean borehole and high drill speed are observed. This fluid has been successfully used in drilling a directional well.