RU126748U1 - LOW DRILL POSITION LAYOUT WITH STRENGTHENED DYNAMIC LOAD ON THE CHISEL - Google Patents

Abstract

An arrangement of the bottom of the drill string with an increased dynamic load on the bit, containing drill pipes, a bit, a downhole screw motor (VZD), a telesystem, characterized in that the arrangement additionally includes a supra-bit downhole oscillator located between the VZD and the bit and capable of amplifying the dynamic component of the axial load on the bit for more effective destruction of the rock in directional and horizontal wells.

Description

The utility model relates to the oil and gas industry, namely, to the field of drilling wells and can be used in the preparation of the layout of the bottom of the drill string (BHA) for drilling directional and horizontal wells.

Analysis of the current level of technology in this field showed the following.

Traditionally, for drilling directional wells using BHA with various types of downhole motors (BH) with curved sub and roller cone bits, however, when using BH rational BHA are not always used.

Known BHA for drilling directional wells and horizontal wells with a downhole motor [RF Patent for utility model No. 58151 ЕВВ 7/06 “Layout of the bottom of the drill string”; RF patent for the invention No. 2280748 ЕВВ 7/04 “Layout of the bottom of the drill string for drilling directional and horizontal wells with a downhole motor”].

The layout of the bottom of the drill string utility model No. 58151 contains a bit, a downhole motor, drill pipes and support-centering elements having an eccentric shape in cross section.

The layout of the bottom of the drill string for drilling directional and horizontal wells with a downhole motor RF patent №2280748 consists of a drill string, chisel, downhole motor and installed between the bottom pipe of the drill string and downhole motor of a telescopic system including a cylinder made in the lower part with holes and connected to the drill string, and a hollow piston located inside it, connected to the engine housing. The layout is equipped with a fixed spool, made in the form of a sleeve with an elastic shaft and installed in the cylinder above its holes, the elastic shaft for entering the piston is made with a conical surface and with annular grooves in which the annular seals are made of elastomeric material.

The disadvantages of these layouts are the complexity of the design, which leads to low reliability of equipment, significant metal consumption, as well as insufficient attention to the factors of destruction of rocks.

The goal is to increase the efficiency of drilling oil wells, especially directional and horizontal, by strengthening the dynamic component of the axial load on the bit.

This goal is achieved by the layout of the bottom of the drill string with enhanced dynamic load on the bit.

The layout of the bottom of the drill string with increased dynamic load on the bit contains drill pipes, a bit, a downhole screw motor (VZD) and a telesystem.

What is new is that the arrangement additionally includes a suprabital downhole oscillator [RF Patent No. 96160 Е21В 7/00 “Downhole Oscillator”], comprising a housing, a calibrated sleeve installed in the housing, a valve, an axis, an upper diffuser and a lower diffuser. A sub-bit downhole oscillator is positioned between the bit and the VZD and is configured to enhance the dynamic component of the axial load on the bit for more efficient rock destruction.

Figure 1 presents the proposed layout of the bottom of the drill string with enhanced dynamic load on the bit for drilling directional and horizontal wells.

The arrangement includes drill pipes 1, a bit 2, a supra-bit well oscillator 3, a VZD 4 and a telesystem 5. A supra-bit well oscillator 3 is located between the bit 2 and the VZ 4.

The layout of the bottom of the drill string with enhanced dynamic load on the bit works as follows.

Using VZD 4 bit 2 is driven into rotation. The presence of the telesystem 5 is necessary to determine the spatial position of the BHA, as well as to obtain additional information from the bottom: gamma logging, apparent rock resistance, bottom temperature, etc.

When using over-bit downhole oscillators 3 in the bottom of the drill string, longitudinal low-frequency oscillations of the flushing fluid reaching the bottom of the well can enhance the dynamic component of the axial load on bit 2 and contribute to more efficient rock destruction. Small amplitude longitudinal vibrations contribute to a decrease in the friction forces of the drilling tool against the borehole wall, thereby contributing to the achievement of the axial load on the bit 2.

The smooth loading of the load on the bit 2 and simplification of the layout control when the over-bit downhole oscillator 3 is included in it becomes possible when using PDC bits (bits with polycrystalline diamond inserts), even in depleted formations during sharp azimuthal turns.

There is the possibility of achieving large distances from the vertical with a decrease in the need for pacing, trunking and “undermining” the layout in order to bring the load to the bottom.

Thus, the use of an over-the-well borehole oscillator makes it possible to efficiently use BHA together with PDC bits in rather difficult conditions, increasing the mechanical speed of directional drilling and the dynamic load on the bit, reducing the number of downhole tool failures, eliminating tool hanging, and improving the BHA controllability.

Claims (1)

An arrangement of the bottom of the drill string with an increased dynamic load on the bit, containing drill pipes, a bit, a downhole screw motor (VZD), a telesystem, characterized in that the arrangement additionally includes a supra-bit downhole oscillator located between the VZD and the bit and capable of amplifying the dynamic component of the axial load on the bit for more effective destruction of the rock in directional and horizontal wells.

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