Oil well blockage removing method for serious wellbore scaling

• Main Author: YAO HUAPING
• Format: Patent
• Language: Chinese; English
• Published: 15.01.2021
• 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 the field of oil drilling, in particular to an underground shaft scaling defibering technology. The oil well blockage removing method for serious wellbore scaling comprises the following steps that (1), a construction pipe column is put down after drifting and well washing are conducted to an artificial well bottom; 2), well washing is circulated conducted through wellborewell washing liquid, after sleeve return liquid is clean and reaches the standard, pre-treatment liquid is replaced, and after the foremost end of the pre-treatment liquid reaches a designed well section, a sleeve valve is tightly closed, and the pre-treatment liquid is squeezed and injected; 3), the pretreatment liquid, the main treatment liquid and the displacement liquid are squeezed and injected continuously, and an oil pipe gate and a sleeve gate are closed; and 4), when the pressure of an oil pipe is reduced to zero, the oil pipe gate and the sleeve gate are opened, and the well is backwashed until the well is