Universal wheel near bit stabilizer

Abstract

The invention relates to a universal roller near-bit stabilizer. The stabilizer comprises a body, a drill bit and a universal roller mechanism. The universal roller mechanism is mounted in grooves evenly formed in the peripheral direction, outside the body, the body is directly connected with the drill bit through the front end of a thread, the rear end is connected with a drive rod part, the universal roller mechanism is freer than a common roller, the rotation direction is a rotation composition of two rollers, the change of the friction direction caused by the change of drilling rate of the drill bit can be adapted well, and when drilling is carried out, it is convenient for a drill string to trip in and trip out. The outer diameter of the stabilizer and the outer diameter of the drill bit are the same, and therefore cutting teeth of the drill bit can be protected, and it is ensured that in the drilling process, boreholes are consistent in size. The universal roller near-bit stabilizer is simple in centralizer structure, reasonable in design, capable of reducing the friction between the drill string and well wall, the flow resistance of mud and down tube resistance, capable of improving the centering degree of the drill bit, capable of improving the abrasion resistance of a centralizer and capable of improving the well wall quality of the drilling, and therefore the drilling efficiency is improved.

Description

technical field [0001] The invention relates to a downhole tool used for oil drilling, in particular to a universal wheel type near-drill bit stabilizer used at the drill bit. Background technique [0002] In the drilling operations of horizontal wells, directional wells and conventional wells in oil and gas fields, due to the gravity and the complex interaction between the drill bit and the formation, it is difficult to center the drill bit, which seriously affects the drilling quality. At present, when drilling on the earth's crust, some abrasive rocks are often encountered, which aggravates the wear of the drill bit and causes the working straight diameter of the drill bit to be worn and reduced. The new drill bit cannot reach the bottom of the well with the factory size. In order to ensure the diameter of the well, two methods are generally used. One method is to add teeth and gauge blocks on the drill bit to enhance the gauge capacity of the drill bit. , to extend the ...

AI Technical Summary

Problems solved by technology

[0002] In the drilling operations of horizontal wells, directional wells and conventional wells in oil and gas fields, due to the gravity and the complex interaction between the drill bit and the formation, it is difficult to center the drill bit, which seriously affects the drilling quality

At present, when drilling on the earth's crust, some abrasive rocks are often encountered, which aggravates the wear of the drill bit, resulting in the wear and tear of the working straight diameter of the drill bit.

The new drill bit cannot reach the bottom of the well with the factory size. In order to ensure the diameter of the well, two methods are generally used. One method is to add teeth and gauge blocks on the drill bit to enhance the gauge capacity of the drill bit. , to extend the service life of the drill bit, because the geological conditions on the earth's crust are complicated, and the drill bit is in the substratum with strong abrasiveness, the service life of the drill bit using the above method is still very short, and the materials for making the drill bit are very expensive, which increases the drilling cost. This method It's not suitable

[0003] Another way is to connect a stabilizer between the drill bit and the drill collar. When the drill bit wears out to be smaller than the standard size, the stabilizer can expand the well diameter to the standard well diameter. The current stabilizer is a It is a material with strong cutting performance that is directly welded on the stabilizer body, so that the main stabilizer becomes an eye reaming tool. Using such a stabilizer is easy to wear and tear. After the welded cutting material is worn out, it is necessary to re-weld the cutting material, It takes a lot of time to repair the cutting edge. At the same time, the strong cutting material welded on the stabilizer body is fixedly connected with the stabilizer body. During the drilling process, the drill pipe vibrates violently, so that the strong cutting material welded on the stabilizer body and the The rocks in the earth's crust are in direct contact with each other, which can easily break the cutting edge, and the use effect is not very good.

The other is to connect the roller on the stabilizer body, and use the cutting teeth on the roller to scratch the hole, so that the upper and lower well diameters are the same. The resistance of the drill bit is increased, which affects the usability of the stabilizer and shortens the service life of the drill bit

The conventional rigid stabilizer wears very seriously when working in the downhole, resulting in short service life and unable to protect the drill bit for a long time

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