The invention discloses a hydraulic ball centralizer and a drilling and
grinding method for a
cement plug in a casing
pipe, specifically, a drilling and
grinding tool is always centered in the rotating process through the hydraulic ball centralizer, and the situation that when the drilling and
grinding tool deviates in a shaft, a
window opening accident is easily caused on the casing
pipe is avoided; meanwhile, a
scrap returning channel is arranged on the hydraulic ball centralizer, and
scrap blocking accumulated in the drilling process is eliminated, so that the drilling speed is increased, and the purpose of improving the drilling and grinding construction efficiency is achieved; in addition, by optimizing a construction
pipe column structure, selecting and matching a
drill collar and the like to increase a counter weight, the problems that drilling footage is slow due to the fact that drilling pressure cannot be applied when a
cement plug is shallow, and a tool is blocked by chippings in the drilling and
grinding process are solved; the drilling and grinding method is an optimized technological method, efficient and low-damage drilling and grinding of the
cement plug of the long well section in the large cased well pipe of the gas storage are achieved, and therefore experience and a method for treating the well are provided for an
oil field.