Speed-control plugging slurry, preparation method thereof and step-by-step plugging method

• Main Authors: LU FEIFEI, GAO WEI, FAN SHENG, GENG YUNPENG, LI WENXIA, ZHANG JUN, FANG JUNWEI, YU YANG, LI SHUANGGUI, ZHAI KEJUN, FANG JING, LI YINTING, QI BIAO, SHEN QINGYUN
• Format: Patent
• Language: Chinese; English
• Published: 25.11.2022
• 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 a speed control plugging slurry and a preparation method and a step-by-step plugging method thereof, the speed control plugging slurry comprises a plugging material and a special plugging material carrying fluid, the special plugging material carrying fluid comprises 100 parts by weight of water and 3-5 parts by weight of a material suspending agent, and the plugging material comprises 5-8 parts by weight of a small particle size composite plugging agent and 6-12 parts by weight of a skeleton proppant. A material suspending agent is adopted to form a special plugging material carrying liquid, and a speed-controlled plugging slurry with a controllable filtration speed is formed, so that the plugging and stacking efficiency of the plugging material in a crack is improved; and a step-by-step plugging method that the particle size of the skeleton proppant is from small to large is utilized, the crack width factor does not need to be considered, and broad-spectrum crack plugging is achieve