Efficient drill cement tool

Abstract

The invention relates to an efficient drill cement tool which comprises a sharp drill bit, a pear-shaped milling awl and a connector. The sharp drill bit is arranged on the lower portion of the pear-shaped milling awl which is arrange on the lower portion of the connector; multiple water outlet grooves are evenly distributed on the periphery of the pear-shaped milling awl, circular protrusions are arranged on the portions, located at the rear portions of the water outlet grooves, of the pear-shaped milling awl in the circumferential direction, and cemented carbide is arranged on the circular protrusions. The efficient drill cement tool is connected to the lower portion of a down-hole drilling tool and goes down to the cement surface to conduct drill cement operation by starting pumping; the sharp drill bit in the front makes contact with the cement first, under the action of bit pressure, the sharp drill bit enters the cement layer, by means of the torque of a rotating plate, a cement plug is cut, and faster drilling footage is achieved; the pear-shaped milling awl in the middle can scrape residual cement on the casing well, the drill cement well section is cleaned, and the diameter of a wellbore is maintained to make the next construction operation convenient; the pear-shaped milling awl can still play a role of righting to protect a casing, thus, the whole construction process can be completed through single string running.

Description

technical field [0001] The invention relates to a high-efficiency ash-drilling tool, which is used in ash-drilling construction operations. Background technique [0002] With the continuous deepening of oilfield development, it is necessary to carry out drilling ash operation construction in the casing. Usually we generally choose point drills or grinding shoes. The sharp drill bit has the characteristics of fast footage and high drilling speed, but its disadvantages are also obvious. Due to the large drilling pressure, the cuttings particles are also large and easy to jam the drill bit; and the well diameter of the ash drilling section is irregular, and residual ash is easy to leave, which is not convenient for the next operation. construction. Although shoe-grinding drill ash can maintain a good diameter, the footage is extremely slow and it is easy to block water holes and damage casings. Therefore, it is imperative to develop a high-efficiency ash drilling tool that c...

AI Technical Summary

Problems solved by technology

The sharp drill bit has the characteristics of fast footage and high drilling speed, but its disadvantages are also obvious. Due to the large drilling pressure, the cuttings particles are also large and easy to jam the drill bit; and the well diameter of the ash drilling section is irregular, and it is easy to leave residual ash, which is not convenient for the next operation. construction

Although the shoe-grinding drill ash can maintain a good diameter, the footage is extremely slow and it is easy to block the water hole and damage the casing

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