SU1601317A1 - Supporting and centering member of drill string - Google Patents

Abstract

BACKGROUND OF THE INVENTION The invention relates to devices for wiring exploration wells with projectiles with a removable core receiver. The purpose of the invention is to increase the reliability of work. The device includes a tubular body 1 with centering sleeves (CV) 2 fixed at the ends with a gap 2. The body 1 is made with an equal cross-section in the form of an equilateral triangle. The diameter of the circle described around the housing 1 in its middle part is equal to the outer diameter of the CV 2, and at the ends on the length of the CV 2 it is equal to the internal diameter of the latter. Windows 7 are provided for the passage of flushing fluid. The device improves the static stability of the drill string. The drilling fluid during drilling passes through the channels formed by the windows 7, housing 1 and CV 2. 4 Il.

Description

t The invention relates to devices for earthing exploration wells with projectiles with a removable core receiver. The purpose of the invention is to increase reliability.

i FIG. 1 shows the support-centering element of the drill string, general view; n4 of fig. 2 is a section A-A in FIG. one; FIG. 3B in FIG. one; in fig. 4 section

Bf-B in FIG. one.

 The support-centering element of the boring column consists of a tubular body lie rigidly mounted on the ends of the support sleeves 2 with the outer surface of the body 1 longitudinal lengths 3.

j Body 1 is made with an equilateral triangle cross-section. In this case, the diameter D of the circumference described around the housing 1 in its middle part, the diameter of the outer surface of the support sleeve 2, and at the ends of the installation length of the support sleeve 2 is the diameter d of the inner surface of the latter. The housing 1 has a thread 4 for connecting d with the drill pipe 5.

i The support sleeves 2 are connected to the body ll by means of pins 6. Windows 7 are formed to pass the 4-part fluid into the longitudinal channels 3 4 of the body; The support-centering element of the drill-yoy column works as follows. Through threads 4, the centering element of the drill string is connected to the drill pipes 5.

Inclusion of the centering element in the composition of the drill string column POVA-A 5

saves the static stability of the latter, allows the vertical well to be carried out at optimal drilling mode and helps to reduce the intensity of the zenith curvature of the well.

The drilling fluid in the drilling process passes through the channels formed by the windows 6, the channels 3 between the housing I and the support sleeves 2. The total transverse

the cross section of these channels is equal to the area of the annular gap between the wall of the wellbore and the middle part of the housing 1. This embodiment provides a uniform flow of flushing fluid. The absence of protruding elements on the outer surface of the support sleeves 2 associated with the housing 1 with pins 4 reduces the development of the wall of the wellbore.

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Claims (1)

Invention Formula The support-centering element of the drill string, includes a tubular body with supporting bushings rigidly fixed at its ends, forming longitudinal channels with the outer surface of the body, characterized in that, in order to increase the reliability of operation, the body in cross section is made in the form of equilateral triangle, and the diameter of a circle described by the vertices of the triangle 0 in the middle part of the body, equal to the diameter of the outer surface of the support sleeve, and at the ends of the body for the length of the installation of the support sleeve - the diameter of the inner surface of the latter. Bb FIG. 2 FIG. 3 FIG.