SU1802064A1 - Well reamer - Google Patents

Description

The invention relates to drilling equipment, and in particular to devices for calibrating wells and apo-centering devices.

The aim of the invention is to improve the quality of the calibration of the well and the mechanical drilling speed.

In FIG. 1 shows the proposed calibrator, General view: in FIG. 2 - view A of incisor 4.

The calibrator consists of a housing Г, blades 2, reinforced with cylindrical, wear-resistant inserts 3, and a lead-in conical surface, reinforced with pore-damaging elements 4. Wear-resistant cylindrical inserts 3 are installed according to the known scheme. Cutters 4 are wear-resistant inserts with two intersecting cutting edges B and C.

Unlike the prototype, the transition zone of the blades from the conical to the cylindrical surface is completely protected by wear-resistant inserts-cutters 4, and as the calibrator is working, the wear of the cutters occurring in the diametrical direction of the calibrator is not accompanied by blunting of the cutting edge B.

Since abnormal wear in the transition zone protected by cutters is eliminated, the phenomenon of the calibrator freezing is minimized.

The work of the calibrator is as follows.

The wellbore formed during the drilling process has irregularities and local curvatures; its shape differs from the cylindrical one. Calibration of the wellbore by the calibrator is carried out by rotating it around its own axis and creating an axial load. When this occurs, the destruction of the near-stem array of the well with the edges B and C of the cutters 4.

Cutters 4 protrude above the conical surface of the blades of the calibrator, thus forming an open front cutting surface, which leads to more effective destruction of the rock than is the case with the known designs of calibrators providing a low-performance mode of destruction by abrasion.

1802064 A1

1802064 4

During operation, as a result of wear on the cutters 4, a wear surface S is formed, increasing in area to St. The increase in the area S is accompanied by an increase in the cutting edge B. And the cutting edge B remains constantly sharp, therefore, unlike the known constructions, in the process of working the calibrator up to the full resource, the efficiency of destruction of the near-barrel mass by cutting does not decrease. In addition, in contrast to the known ones, the calibrator blades at the points of transition of their cylindrical v-conical surfaces are protected by wear-resistant inserts 4, which eliminates the abnormal wear of the blades in these places.

These technical advantages allow you to increase the life of the calibrator and the mechanical speed of calibration or drilling configurations with calibrators.

The economic efficiency of the proposed technical solution can be calculated according to the results of the development of prototypes in industrial conditions.

Claims (1)

5 claims A calibrator comprising a housing with blades having a lead-in tapered surface and rock cutting inserts with a working part located on lead-in tapered surfaces of the blades, characterized in that, in order to increase the calibrator’s productivity by cutting the rock by cutting and the quality of calibration by obtaining a smooth the surface of the borehole wall, rock cutting inserts are installed above the inlet conical surfaces of the working parts made with two 20 cutting daisies, one of which is located on the surface of the cylinder, the diameter of which is equal to the diameter of the calibrator. Compiled by A. Popov Editor Tehred M. Morgenthal Corrector L. Pilipenko Order 834 Circulation Subscription VNIIIPI of the State Committee for Inventions and Discoveries at the State Committee for Science and Technology 113035, Moscow, Zh-35. Raushskaya nab., 4/5 Production and Publishing Combine Patent, Uzhgorod, 101 Gagarin St.