RU1808963C - Device for hole drilling - Google Patents

Abstract

Usage: drilling oil and gas wells. SUMMARY OF THE INVENTION: The apparatus comprises a drill string with dips at the lower end. The axles are connected to the column by means of a bearing assembly. On the lower sub with eccentricity the drill bit is fixed. The body of the bit is made conical. The top of the cone is directed to the side opposite to the working end of the bit. A stabilizer is installed on the upper adapter above or at the level of the bearing assembly. 1 s.p. f-ly, 1 ill.

Description

The invention relates to the drilling of wells, in particular, to the construction of devices for connecting drill pipes to a bit, and can be used in the drilling of oil, gas and other wells.

. The aim of the invention is to ensure efficient operation of the bit in the mode of a pair of rotations with a given eccentricity.

The drawing shows a General view of the device for drilling wells in section. The device is worn from a sub 2 connected to the drill string 1, in the lower end of which with a given eccentricity on the locking bearings 3 a second sub 4 is mounted coaxially on which the drill bit 5 is located. Stabilization of the device and, therefore, a given eccentricity is facilitated by a stabilizer 6 mounted on the upper sub above or at the level of the bearing assembly.

The device operates as follows.

When the drill string 1 rotates around its axis, the latter rotates around the axis of the well and the drill bit 5 eccentrically mounted on it. But since the drill bit 5 has the ability to rotate and around its axis it will rotate around it, subject to the principle of least power consumption.

According to the law of power consumption from friction forces, the bit 5 will enter the rotation mode around two parallel axes with a gear ratio of 1, i.e. into pair rotation mode. Moreover, this will be the reverse of the precession, i.e. the angular velocities of drill string 1 and drill bit 5 will have different signs.

In this mode, each element of the end face of the bit will be described on the plane of the trajectory in the form of circles with a radius equal to eccentricity and constant speeds of movement. This will ensure uniform wear of the bit armament and more efficient work to destroy the rock.

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Claims (2)

This device can be used in any of the drilling methods: rotary or turbine; bits of any type: abrasive or cone. The magnitude of the eccentricity may depend both on the physicomechanical properties of the rock and on the design of the bit. The second is for the purpose of preventing the formation of cylindrical pillars. And since this is possible, j then, naturally, this device can be used with the appropriate bit design also when drilling with coring (core drilling). The uniform wear of the end face of the bit significantly increases its wear resistance and, therefore, the technical and economic efficiency of well drilling. The claims 1. A device for drilling wells, consisting of a drill string, on the bottom 0 at the end of which, with the help of parallel-axis sub, connected by means of a bearing assembly, a drill bit with a working end is fixed, which means that, in order to ensure efficient operation of the drill bit in the mode of a pair of rotations with a given eccentricity, the drill bit body made conical, and the top of the cone is directed to the side opposite to the working end. 2. The device pop. 1, characterized in that, in order to more rational the work of the bit in the mode of a rotation pair with a given eccentricity, it is equipped with a stabilizer mounted on the upper sub above or at the level of the bearing assembly. with, u,.