Anti-collapse and drag-reducing polymer drilling fluid and application thereof

• Main Authors: LI GENYI, LI YOUMING, ZHANG MIN, ZHU YIJI, YAO BINKE, ZHOU HONGLEI, LIU CHANGQING, LI SHENGYONG, LI ZHIYONG, CHEN AIXIN
• Format: Patent
• Language: Chinese; English
• Published: 01.02.2017
• Subjects: ADHESIVES; CHEMISTRY; DYES; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MINING; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PAINTS; POLISHES

The invention relates to an anti-collapse and drag-reducing polymer drilling fluid, which includes, by mass, 3-5 parts of sodium-based bentonite, 1-3 parts of plant gum, 0.5-1.5 parts of a broad spectrum wall protective agent, and 0.1-0.3 parts of sodium hydroxide. The drilling fluid has anti-collapse and drag-reducing performances and has excellent compatibility in pebble and broken rock stratums; especially, the drilling fluid, when being used in an SDB single-action twin-pipe core barrel drilling process, can reach a high rock core collection rate and can maintain an original rock structure in the rock core. 本发明涉及种防塌减阻聚合物钻井液，其钠基膨润土3～5质量份、植物胶1～3质量份、广谱护壁剂0.5～1.5质量份、氢氧化钠0.1～0.3质量份。其具有防塌减阻性能，能够在卵石、破碎岩石地层中具有良好的适用性，尤其是，在采用SDB单动双管岩芯管钻探工艺中，作为钻井液使用，可以获得较高的岩芯采取率，并且岩芯能够保持原岩结构。