SU1218052A1 - Earth-drilling apparatus - Google Patents

Description

The invention relates to the drilling of vertical wells in a rotational manner and can be used to prevent their curvature.

The purpose of the invention is to improve the accuracy of the vertical well.

FIG. 1 shows a device for drilling wells; in fig. 2 is a section A-A in FIG. one.

The device includes a housing 1, an annular weight 2 freely mounted relative to the housing 1, a centering sleeve 3 located in the cavity of the annular cargo 2 above its center of gravity, an upper sub 4 and a lower sub 5 installed in the upper part of the annular cargo 2 supporting element 6 with radial blades 7, made of elastic material, and transverse cuts, with the centering sleeve 3 fixed to the outer surface of the housing 1. To prevent the slit from entering the cavity formed by the housing 1 and the annular 2 ohm, and between the top sub 4, a gasket 8 in the form of a resilient corrugation.

The device for drilling wells works as follows.

In the process of drilling with bit oscillations arising during its rotation, the ring load 2 makes longitudinal oscillatory movements relative to the housing 1, hitting the lower sub 5 at the same time. The direction of these movements and the impact of the ring load 2 about the lower sub 5 is determined by the gravitational forces, and therefore, the load 2 is in a position in which its axis is vertical. The radial blades 7 of the support element b, interacting with the borehole wall, impede the rotation of the annular weight 2. Since the rigidity of the blades 7 in the axial direction is much less than the rigidity in the direction perpendicular to this axis, they do not significantly interfere with the longitudinal oscillations of the annular cargo 2. When certain ratios of the axial elasticity of the radial blades 7 of the support element 6, the weight of the ring weight 2 and the frequency of forced oscillations of the bit; elastic blades 7 can contribute to an increase in the amplitude of the oscillating 2 nd ring cargo.

Editor M. Kelemesh Order 1097/40

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Compose. V. Homeland

Tehred I. Veres Corrector L. Patay

Circulation 548 Subscription

Claims (1)

DRILLING DEVICE A WELL including a housing, an annular load freely mounted relative to the housing, a centering sleeve located in the cavity of the annular load above its center of gravity, upper and lower sub, characterized in that, in order to improve the accuracy of the vertical well, the annular load is positioned with a clearance on the outside the surface of the housing and has a support element mounted in the upper part with radial blades made of elastic material and transverse cuts, the centering sleeve being fixed to outer surface of the housing. ABOUT SP Yu> cpul.t