SU1441056A1 - Diamond crown bit - Google Patents

Abstract

The invention relates to the drilling of exploration wells for solid minerals. The goal is to increase the durability of the crown and the mechanical speed of drilling. The crown consists of a housing 1, a diamond-containing matrix (M) 2, connecting thread 3, flushing grooves. Diamond-bearing M 2 affects the rock and destroys it. The resulting drill cuttings wear out the M 2 material and expose bulk diamonds, providing a constant mechanical drilling rate at constant drilling conditions. The side surfaces of the grooves form an angle between each other, ensuring, for any value of the current crown radius, such a length of the cutting line at which single diamonds have the same depth value across the entire width of the sector’s diamond layer, resulting in equal sized gaps at the same width of the entire width M 2. This allows you to work out the bulk M 2 over the entire height. 2 Il. from € (L

Description

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The invention relates to a drilling tool, namely to diamond drill bits, intended for drilling exploration wells to solid minerals.

The aim of the invention is to increase crown durability and mechanical drilling speed.

FIG. 1 shows the proposed diamond crown, a section along the axis of the crown; in fig. 2 - crown, view from the side of the working end of the diamond-containing matrix.

A diamond crown consists of a body 1, a diamond-containing matrix 2, a connecting thread 3, and a flushing groove 4.

The crown works as follows.

Using a connecting thread, the 4 diamond drill bit is screwed to a core set (not shown), which is rotated from the drilling machine by transmitting torque through the drill string. In addition, axial load and flushing fluid are transmitted through the drill string. In this case, the diamond-containing matrix 2 acts on the rock and destroys it. The resulting cuttings wear out the matrix material and expose bulk diamonds located in the matrix, thereby ensuring a constant mechanical drilling rate at constant drilling conditions. Due to this design of the washing slots 4, their side surfaces

they form an angle p between each other, which ensures at any value of the current crown radius such a length of the cutting line, at which single diamonds have the same depth value throughout the width of the diamond-bearing layer of the sector, and, as a result, form the same-sized fraction of the rock slime. This equalizes the rate of wear of the crown matrix formed during drilling with sludge.

throughout the width of the diamond-containing matrix, which allows the bulk layer of this matrix to be worked out over its entire height.

Claims (1)

Invention Formula A diamond crown, comprising a housing and a diamond-containing matrix fixed on it, divided into sectors by washing grooves, the side surfaces of which are parallel to the axis of the crown, which, in order to increase the durability of the crown and the mechanical drilling speed, in the plane, perpendicular to the crown axis, they form an angle between themselves, the value of which is determined by the expression l., 1 / L / Ot / iTvi / 74 2arctg Fc  } outer and inner diameters of the crown, respectively; the width of the washing slot; number of sectors.