Intelligent vertical drilling system and drilling method

Abstract

The invention provides an intelligent vertical drilling system and a drilling method, and belongs to the field of petroleum engineering. The intelligent vertical drilling system comprises an upper drilling tool, a flexible short section, an intelligent vertical drilling tool, a middle drilling tool unit, a centralizer and a drill bit which are sequentially connected, wherein the intelligent vertical drilling tool is arranged away from the drill bit and provided with a thrust body, and the thrust body has a telescopic function; the intelligent vertical drilling tool can judge the well deviation condition through gravity, and therefore the thrust body is controlled to stretch out and draw back to apply pushing force; and when well deviation exists, the thrust body of the intelligent vertical drilling tool outputs the pushing force pointing to the low edge of a borehole, the centralizer serves as a fulcrum, the pushing force is applied to the drill bit, and therefore the drill bit bears the force pointing to the low edge of the borehole, lower well wall cutting is generated, deviation is reduced, and the triple targets of improving the deviation preventing and straightening effect, prolonging the service life of the vertical drilling system and increasing the speed through the vertical drilling technology are achieved.

Description

technical field [0001] The invention belongs to the field of petroleum engineering, and in particular relates to an intelligent vertical drilling system and a drilling method. Background technique [0002] The problem of anti-deviation and straight drilling of vertical wells and directional wells has always been a hot research issue in the drilling industry. With the continuous increase of drilling depth, the expectation of solving this problem becomes more and more urgent. The current anti-deviation and straight drilling methods mainly rely on conventional anti-deviation drilling tool assemblies and automatic vertical drilling systems. Conventional anti-deviation drilling tools mainly include tower drilling tools, pendulum drilling tools, full-hole drilling tools, off-axis drilling tools, eccentric double-core spiral stabilizer anti-deviation drilling tools, etc. These drilling tools are also called "passive anti-deflection tools". The field application results show that ...

AI Technical Summary

Problems solved by technology

Conventional anti-deviation drilling tools mainly include tower drilling tools, pendulum drilling tools, full-hole drilling tools, off-axis drilling tools, eccentric double-core spiral stabilizer anti-deviation drilling tools, etc. These drilling tools are also called "passive anti-deflection tools". The field application results show that the declination ability of this kind of drilling tools is difficult to meet the requirements of deep wells, complex wells, high-steep structures and high-dip formations, and the drilling pressure must be sacrificed as a condition, which seriously hinders the drilling speed. improvement

The automatic vertical drilling systems mainly include the Power V system of Schlumberger Company, the VertiTak system of BakerHughes Inteq Company, and the ZEB system of German Intelligent Company. There are also a series of problems during use, mainly as follows: (1) When drilling in difficult-to-drill formations, the tool life is difficult to meet the site requirements, mainly because the tools are severely worn; The structure and other formations are not ideal, and need to be further improved; (3) there is a phenomenon that the pushing force applies the wing ribs to eat into the well wall, so that the drilling pressure cannot be applied and the deflection can not be straightened; (4) the drilling speed still has a large room for improvement. However, when using this type of tool, if a speed-up tool or other tools are added between the tool and the drill bit, it will affect the anti-slant straightening effect, and if a speed-up tool is added above the tool, it will further reduce the service life of the anti-slant straightening tool

Now the focus of solving the problem of tool life is to optimize the material and structure; the method to solve the unsatisfactory anti-deviation straightening effect is to increase the tool pushing force; The method of solving the problem of tool life and wing rib eating into the well wall has limited effect. There are also big problems in improving the effect of anti-deviation and straightening by increasing the tool pushing force, such as aggravating tool wear and increasing the degree of wing rib eating into the well wall. etc. In addition, when using the automatic vertical drilling system to drill wells, how to cooperate with the speed-up tool to further increase the drilling speed has not been able to effectively solve the problem.

Images