Lost circulation additive for plugging severe mud loss formation fracture and preparation method of lost circulation additive

• Main Authors: BAO YU, LIU LEI, ZHU MINGMING, ZHOU BO, QU YANPING, ZHANG QIAN
• Format: Patent
• Language: Chinese; English
• Published: 10.10.2017
• Subjects: ADHESIVES; ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; DYES; LIME, MAGNESIA; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; POLISHES; REFRACTORIES; SLAG; TREATMENT OF NATURAL STONE

The invention provides a lost circulation additive for plugging severe mud loss formation fracture and a preparation method of the lost circulation additive. The lost circulation additive comprises the following components in percentage by mass: 45-56% of oil well grade-G cement, 8-12% of gravel, 12-15% of granolithic, 15-20% of fracturing sand, 6-9% of a thin plugging agent, 1-2% of a fluid loss agent and 2-4% of an admixture. According to the lost circulation additive disclosed by the invention, large fractures and large holes of the severe mud loss formation can be well plugged, the problem that the plugging agent cannot be bridged, remained, filled and reinforced in the large fractures can be well solved, and the requirements on drilling construction and environment friendliness are met. Moreover, the preparation method is simple, the operability is high, the severe mud loss plugging effect is obvious, the plugging operation cost is effectively reduced, and the plugging operation time is saved. 本发明提供了种封堵恶