Extruding and drilling integral milling shoe

Abstract

The invention relates to an extruding and drilling integral milling shoe, which comprises a body used for extruding and plugging, wherein the body is a hollow cavity with open openings at two ends; the inner cavity is divided into a first cavity and a second cavity from top to bottom; at least three notches are uniformly distributed in the side wall of the first cavity by using a body rotating shaft as a symmetry axis; a cutter wing used for unplugging is arranged in each notch; the outer end surface of each cutter wing is a leftwards and rightwards inclined inclination surface; each inclination surface is a grinding surface; the lower end surface of each cutter wing is an upwards and downwards inclined inclination surface; the outer part is exposed out of the body; and the exposed part is a drilling surface. The extruding and drilling integral milling shoe has the advantages that the structure is simple; the manufacturing cost is low; the maintenance and the replacement are convenient and fast; and the accident rate is very low. The extruding and drilling integral milling shoe also has the following characteristics that 1, the center water hole diameter is large, and throttling cannot be formed in the extruding and drilling process; 2, the additional friction cannot be increased during the upward lifting in cement slurry; 3, the drilling and grinding capability is high; the cement ring forming possibility at a well wall is reduced; and 4, the salvage is convenient.

Description

technical field [0001] The present application relates to a squeeze-drilling integrated grinding shoe which integrates the functions of plugging and plugging in the workover process. Background technique [0002] In the workover process, plugging and cementing operations take up a lot of work. The pore throats in sandstone reservoirs and Carboniferous reservoirs are about 16um. Currently, the material for plugging and cementing is G grade cement with a particle size of 76um. Around (ultra-fine cement particle size is 20-30um), the cement slurry cannot enter the sandstone reservoir deep, and can only plug the blasthole and the skin, and the success rate of plugging is not high; the main production layer Ordovician reservoir is fracture- Mostly caves, large leakage, high sweeping (plugging) and low replenishment (plugging) often occur during the plugging process. [0003] Taking the upper and lower sealing measures of sandstone reservoirs as an example, the conventional opera...

AI Technical Summary

Problems solved by technology

If the cement is squeezed twice and the plug is cleaned, it needs 4 trips and 8 trips to complete, and the cement is squeezed three times and the plug is cleaned, it needs 6 trips and 12 trips to complete, and so on. doubled, resulting in high workover labor costs and delaying the recovery time of oil wells

Images