SU1698411A1 - Directional drilling method - Google Patents

Abstract

The invention relates to rotary drilling and can be used for drilling exploration wells (C). The purpose of the invention is to improve the accuracy of penetration of a given trajectory C in the drilling process. To do this, a shock-pulse mechanism 2 located in the immediate vicinity of the drilling tool 3 with a frequency of rotation of the drill string 4 and a phase corresponding to the direction of deviation acts on the wall C 1. Current from the current source 6 is supplied to the electrode (E) 7 surrounded by guard E 8.9 and on E 11 around which guard E 12 is located. The voltage between O 7 and 12 is amplified by power on the amplifier 13 and supplied by E 8.9 and 12. The meter 14 measures the voltage between E. On a rectangular axis coordinate systems at equal distance from the mouth With arranged E 15, 20 similar to 11 and 12 Oe phase influences calculated by formula agsgd + (them + - Ux) / (Uy + - Uf). where Ux + Ux Uy +, Uy are the voltages between E 7 and E 11 15-18, respectively 2 or

Description

The invention relates to rotary drilling of process wells and can be used for drilling exploration and other wells.

The purpose of the invention is to improve the accuracy of penetration of a given well trajectory during drilling.

Figure 1 shows a pre-drilling scheme in a vertical plane; Fig 2 - the same, in the horizontal plane

In a method that involves applying to the tool perpendicular to the direction of supply of a pulse-impact deflecting force with the frequency of rotation of the tool and with the phase shifted relative to the conventional zero phase point by an angle corresponding to the direction of deflection, the deflecting force is applied in the immediate vicinity of the cutting tool and there same current is supplied from the current source to the current electrode, surrounded by guard electrodes, to one of the four current electrodes located on the surface of the earth in equal distance about tons of drilling along the axes of rectangular coordinates, each of which is surrounded by a guard electrode. In this case, the voltage between the connected current electrodes, after amplification in power, is fed to their own guard electrodes and is measured alternately with all four connections.

about

00

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x, is calculated from the measurement results of the phase of application of an impulse-impact force, which is taken into account in which the direction of drilling is controlled,

The method is carried out as follows.

The wall of the borehole 1 is impacted by a pulse-pulse deflection mechanism 2 located in the immediate vicinity of the drilling tool 3, with the frequency of rotation of the drill string 4 of the drilling rig 5 and with a phase shifted relative to the conventional zero phase point at an angle corresponding to the direction of deflection. In this case, from the current source 6, current is supplied through the drill string 4 to the current electrode 7 surrounded on both sides of the drill string 4 by guard electrodes 8, 9 located on the measuring tube 10 located in the immediate vicinity of the drilling tool 3 and a current electrode 11 located on the surface of the earth at a distance from the drilling rig 5, which is equal to the depth of drilling. around which the guard electrode 12 is located, and this voltage is measured by a meter 14. Switch the current source 6 to the current electrode 15 located on the same axis of the rectangular coordinates with the current electrode 11 in the opposite and equal distance from the drilling rig 5 and also surrounded by the guard electrode 16. At the same time, the current electrode 7 is left connected to the current source 6, and the guard electrodes 8.9 are connected to the amplifier 13. The voltage between the connected current electrodes 7 and 5 is amplified by the power of the amplifier 13, is supplied to the security elements trods 8, 9 from one output and to the guard electrode 16 from another output and measure this voltage with a meter 14. Similarly / see Fig. 2/, a current source 6 is connected to the current electrodes 17 and 18 on the ground surface and the power amplifier to guard electrodes 19, 20 located on a different coordinate axis at the same distance from the drilling rig 5, as electrodes 7, 15. The voltage between current electrodes 7 and 17 and current electrodes 7 and 18 are measured alternately.

Based on the measurement results of the voltages Ux +, Ux, Uy +, Uy between the central electrodes and electrodes located on the day surface along the coordinate axes X and Y, respectively, calculate the phase of application of the pulse-impact action using the formula

p arctg

U + - Ux

Uy - Uy

According to the physical meaning, the stresses in this formula are proportional to the values of the volume resistances of rock masses in the measured directions.

The calculated phase is set at the setter 21 phases. The shock-pulse mechanism 2 eliminates the deviation from the specified trajectory.

Claims (1)

The invention method of directional drilling of wells, including the application of kinstrumentu perpendicular to the direction of flow in the process of drilling pulsed shock deflecting force, carried out with a frequency equal to the frequency of rotation of the tool, and a phase that is shifted relative to a zero phase point at an angle corresponding to the direction of deviation, characterized in that, in order to increase the accuracy of penetration of a given well trajectory, a deflecting force is applied in the immediate vicinity of the cutting tool, alternating current is applied and electrical voltages Ux + are measured. Ux, Uy between the central electrode at the bottom of the well, and four electrodes located on the day surface at an equal distance from the wellhead along the axes X, Y of the rectangular coordinate system, with each of the electrodes surrounded by guard electrodes, to which voltage is applied from the main pairs of electrodes, pre-amplified by power, and the phase angle is determined by the formula l arctg iw + - iw