SU1244277A1 - Device for centering drilling tool - Google Patents

Description

The invention relates to the drilling of wells, in particular to the support-centering elements of the drill string, which are included in the layout of the lower part of the drill string.

The purpose of the invention is to ensure the elimination of sticking of the centering sleeve.

FIG. 1 shows a boring tool centralizer, a longitudinal section; in fig. 1.- section A-A in FIG. one.

The drill tool centralizer includes a housing 1 mounted on it for rotation with a centering sleeve 2 connected to the case 1 by two rows of balls 3 located in the annular grooves 4 of the case 1 and the recesses 5 in the centering sleeve 2. On the case 1 to accommodate each the balls 3 are made with longitudinal grooves 6, communicating with the annular grooves 4. The centering sleeve 2 has radial holes for accommodating the plugs 7 that are installed with the possibility of interaction with the balls 3.

The centralizer boring tool works as follows.

The centralizer of the boring tool is installed anywhere in the drill string. In the process of lowering the drill string into the well due to the adherence of the ribs of the centering sleeve to the wall of the well, the body 1 moves downwardly with respect to the centering sleeve 2, and the balls 3 roll out of the longitudinal grooves 6 into the annular grooves 4, as a result of which the body 1 has the possibility of rotation relative to the centering sleeve 2 When the centering sleeve 2 is stuck, the drill string is lifted, and the balls 3 are moved out of the circumferential grooves 4 to the longitudinal grooves b, and as the drill string rotates along with the body 1, the prices rotate riruyuscha sleeve 2, eliminates sticking centering sleeve 2.

During rotation of the drill string, a radial clearance is formed between the plugs 3 and the ends of the plugs 7, as a result of which the body 1 is displaced in the radial direction relative to the centering sleeve 2 and the centering of the drill string in the well stops. In order to eliminate the radial displacement, before the centralizer is lowered into the well, the balls 3 are pressed against the housing 1 by means of the plugs 7.

Srig.

Compiled by V. Rodina

Tehred I. VeresKorrektor O. Lugova

Circulation 548 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

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

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

Claims (2)

1. The DRILLING TOOL CENTER, comprising a housing mounted on it with the possibility of rotation of the centering sleeve, connected to the housing by two rows of balls located in the annular grooves of the housing and recesses in the centering sleeve, characterized in that, in order to eliminate the sticking of the centering sleeve, longitudinal grooves are made on the housing under the annular grooves to accommodate each of the balls, the latter communicating with the annular grooves. 2. The centralizer of π. 1, characterized in that, in order to eliminate the radial displacement of the centering sleeve relative to the housing, the centering sleeve has radial holes, and in the latter are installed with the possibility of interaction with the balls of the tube. figure 1