High temperature-resistant low concentration guar gum weighted fracturing fluid and application thereof

• Main Authors: WANG XIN, XU MINJIE, LIU PING, XUN GUOQING, WANG HAIYAN, FAN RUNQIANG, WANG YONGHUI, JI XIAOHONG, GAO YING, ZOU GUOQING, XU YUN, CHE MINGGUANG, YANG XIANGTONG, GUAN BAOSHAN, YUAN XUEFANG, YANG YANLI
• Format: Patent
• Language: Chinese; English
• Published: 30.03.2016
• 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 provides a high temperature-resistant low concentration guar gum weighted fracturing fluid and an application thereof. Raw materials of the high temperature-resistant low concentration guar gum weighted fracturing fluid comprise 100 parts by volume of a sodium nitrate-containing salt solution, 0.2-0.65 parts by mass of guar gum and/or a guar gum derivative, 0.01-0.1 part by mass of a cosolvent, 1-2 parts by mass of a high temperature synergist, 0.5-2 parts of a pH value adjusting agent, and 0.2-1 part by mass of a cross-linking agent, wherein volume parts and mass parts adopt mL:g as reference. The invention also provides the application of the high temperature-resistant low concentration guar gum weighted fracturing fluid in high temperature reservoir fracturing of deep wells and/or ultra deep wells. The use concentration of a guar gum densifier in the fracturing fluid is low, and the fracturing fluid still has excellent high temperature resistance, and can resist 150DEG C and even 160DEG C or