Anti-deviation drilling tool assembly for rapid drilling of vertical well and drilling method thereof

Abstract

The invention relates to an anti-deviation drilling tool assembly for rapid drilling of a vertical well and a drilling method thereof. The drilling tool assembly comprises a drill bit, a well bottom drilling tool, a first drill collar, a first flexible short section, a first centralizer, a second drill collar, a second flexible short section, a second centralizer and an upper drill column assembly, wherein the drill bit, the well bottom drilling tool, the first drill collar, the first flexible short section, the first centralizer, the second drill collar, the second flexible short section, the second centralizer and the upper drill column assembly are sequentially connected. When drilling is conducted in an inclined well hole, the upper drill column assembly lies on the lower well wall, the second centralizer is used as a first fulcrum, the middle of the second flexible short section is arched downwards, the upper end of the second drill collar is close to the lower well wall, the lower end of the second drill collar drives the lower end of the first centralizer used as a second fulcrum to upwarp, the first flexible short section is lifted, the first flexible short section is arched upwards, and the upper end of the first drill collar is close to the upper well wall, so that the drill bit is pointed to the lower well wall, and the inclination lowering effect is achieved. When drilling is conducted in a straight well hole, the first flexible short section and the second flexible short section are bent, so that the whole anti-deviation drilling tool assembly is in a vortex motion state. The anti-deviation drilling tool assembly not only can realize straight drilling, but also can be suitable for rapid drilling of the vertical well.

Description

technical field [0001] The present invention relates to a drilling tool assembly in oil and natural gas drilling operations, in particular to an anti-deviation drilling tool assembly for rapid drilling of vertical wells; the present invention also relates to an anti-deviation drilling tool for rapid drilling of vertical wells The combined drilling method belongs to the technical field of drilling equipment and drilling technology. Background technique [0002] Vertical wells are the most common type of wells. How to drill vertical wells fast and straight is a problem that the drilling field has been trying to solve, and it is also a difficult problem. Currently proposed straightening methods include conventional drilling tools and automatic vertical drilling tools. Conventional drilling tools mainly include tower drilling tools, pendulum drilling tools, full-bore drilling tools, off-axis drilling tools, eccentric dual-center spiral stabilizer anti-deflection drilling tools,...

AI Technical Summary

Problems solved by technology

Conventional drilling tools mainly include tower drilling tools, pendulum drilling tools, full-bore drilling tools, off-axis drilling tools, eccentric dual-center spiral stabilizer anti-deflection drilling tools, etc. The declination ability of such drilling tools cannot meet the needs of large well depths and complex wells. And the requirements of high and steep structures and high-dip formations, and even the sacrifice of WOB as a condition, it is difficult to achieve anti-deviation while drilling fast

Automatic vertical drilling tools mainly include the Power V system of Schlumberger Company, the VertiTak system of BakerHughes Inteq Company, and the ZEB system of German Smart Company. , its performance is affected, and its popularization and application are also limited

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