RU76680U1 - DEVICE FOR MONITORING POSITION OF A HORIZONTAL WELL - Google Patents

Abstract

The proposal relates to drilling equipment and is intended to control the position of the horizontal wellbore between the roof and the bottom of the reservoir. Control is necessary to ensure that the well is guided along a predetermined path approximately in the middle of the formation and to prevent the wellbore from entering the enclosing rock.

The utility model solves the problem of simplifying the design and improving the efficiency of controlling the wiring process for horizontal well drilling, in particular in low-power formations.

The device comprises: GK sensors installed in the immediate vicinity of the bit, oriented at an angle of 180 ° to each other, and a flux probe located at an angle of 90 ° to the diametrical axis of the GK sensors, in which these GK sensors and a flux probe are located in a separate measuring over-bit module with wireless an electromagnetic communication channel and equipped with an electronic circuit for matching the flux-gate signals with pulses of the GK sensors, containing: a control unit, a switch for switching pulses of the GK sensors, pulse counters of the GK, and also, the total counter of pulses of the HA, in this case, the output of the measuring coil of the flux gate is connected to the input of the control unit that determines the polarity of the output signal of the flux gate and connected to the switch, which switches the transmission channels of the pulses of the counters of the HA depending on the polarity of the output signal of the flux gate to the corresponding pulse counters of the HA, designated as: GK - “top” or GK - “bottom”, the outputs of which are connected to the total counter

GK pulses - the "sum" connected to the measuring circuit of the over-bit module.

Description

The utility model relates to drilling equipment and is intended to control the position of the horizontal wellbore between the roof and the bottom of the reservoir. Control is necessary to ensure that the well is guided along a predetermined path approximately in the middle of the formation and to prevent the wellbore from entering the enclosing rock.

The well-known NaviGator system, which combines an orientable drilling engine using sensors for geosteering and formation assessment sensors, contains an inclinometer, two azimuthal gamma sensors oriented at an angle of 180 ° relative to each other and a multi-frequency resistivity sensor for rocks that can detect the boundary during horizontal drilling contrasting formation and fluid contact at a distance of up to 5.5 meters from the sensor (materials from Baker Hughes Inteq, USA, 2006).

This device allows the driller to make timely detection of reservoir boundaries in horizontal wells before the bit leaves the target zone.

The design drawback is that azimuthal gamma sensors are significantly removed from the bit, which reduces the control responsiveness when drilling in thinner formations.

Known equipment for determining the direction of the well during drilling, in the form of a design with a directional gamma sensor, containing a series of Geiger-Muller counters located in a pipe segment above the drill bit and several magnetic and gravity sensors that provide directional characteristics in the process

rotation of the gamma sensor. These orientation sensors include accelerometers and magnetometers suitable for detecting changes in the orientation and position of the instrument sub. Accelerometers are able to detect in real time a rotational displacement from the standard as it occurs during drilling. Magnetic flux sensors, or magnetometers, facilitate the identification of the azimuthal orientation of the device based on the Earth's magnetic field. (International patent WO No. 02/082124 A1, class G01V 3/30, international application PCT / USA / 02634, priority 04/06/2001)

According to the accelerometers, the apsidal angle of the gravimeter and the orientation of a number of gamma counters can be calculated.

The magnetometer output is a sine wave, the period of which is the speed of rotation, and the amplitude of which represents the position of the device in the Earth's magnetic field. During rotation, the magnetometer output can be measured continuously and its amplitude determined from peak to peak. With this information, and using well-known mathematical formulas, you can set the angular position of the magnetometer at any given moment (prototype).

A disadvantage of the known equipment is the complexity of the design, which contains a number of Geiger-Muller counters and a special mechanism with a stepped motor for positioning windows for transmitting radiation. In addition, up to 8 magnetometers and several accelerometers are used here, which also complicates the signal processing scheme and their coordination with the readings of gamma counters.

The objective of the proposed utility model is to simplify the design and increase the efficiency of control of the wiring process during horizontal drilling of wells, in particular in low-power formations.

This problem is solved in that in the device for monitoring the position of the horizontal wellbore containing installed

in the immediate vicinity of the bit, gamma-ray logging (GK) sensors (scintillators or Geiger counters) oriented at an angle of 180 ° to each other, and a flux probe (magnetometer) located at an angle of 90 ° to the diametrical axis of the GK sensors, while these sensors GK and fluxgate are located in a separate measuring over-bit module with a wireless electromagnetic communication channel and are equipped with an electronic circuit for matching fluxgate signals with pulses of GK sensors, containing: a control unit, a switch pulse switch of sensors GK, GK pulse counters, as well as the total GK pulse counter, at the same time, the output of the measuring coil of the flux gate is connected to the input of the control unit, which determines the polarity of the output signal of the flux gate and controls the switch, which switches the channels of the pulse passage of the GK counters, depending on the polarity of the output signal a flux-gate into the corresponding counters of pulses of HA, designated as: GK - “top” or GK - “bottom”, the outputs of which are connected to the total pulse counter of GK - “sum”, connected to The testing scheme of the over-bit module.

Figure 1 shows the cross section of the above-bit module with blocks of sensors GK and a flux gate.

Figure 2 shows a sinusoidal change in the amplitude of the output signal of the flux gate during rotation of the flux gate together with a supra-bit module.

Figure 3 presents a diagram of the matching signals of the flux gate with pulses of the sensors GK.

Figure 4 shows the location of the bit within the boundaries of the reservoir.

The device contains: (pos. 1) - the first block of sensors GK (GK1), (for example, scintillators or Geiger counters), and (pos. 2) - a second block of sensors GK (GK2), located at an angle of 180 ° to each other,

a flux probe 3, oriented at an angle of 90 ° to the diametrical axis of the blocks of sensors GK. These sensors are placed in the recesses of the casing of the measuring supra-bit module 4, (Fig. 1) with a wireless electromagnetic communication channel that transmits information to the receiving module of the main television system that provides the well wiring. The design of the telesystem and over-bit module is presented in detail in the description of the patent of the Russian Federation for utility model No. 27839, where their work is described.

The coordination scheme (Fig. 3) of the signals of the flux-gate 3 with the pulses of the sensors GK1 and GK2 contains: a block of pulse counters GK1 (pos. 5), a block of pulse counters GK2 (pos. 6), a control unit 7, to which the output of the measuring coil of the flux-gate 3 is connected , a switch 8, to which the outputs of the control unit 7 and the outputs of the pulse counter blocks GK1 and GK2 are connected, as well as the pulse counter of the HA indicated by “top” (pos. 9), and the pulse counter of the HA indicated by “bottom” (pos. 10), the inputs of which are connected to the switch 8, and the outputs to the total counter of pulses GK, about The values as a "sum" (item 11). Pos.12 - a bit with a pre-bit module 13 and a telesystem 14 within the boundaries of the reservoir (figure 4).

The device operates as follows.

When the flux-gate 3 is rotated together with the over-bit module 4, one of the components of the directivity vector of the Earth’s natural magnetic field coincides with the sensitivity axis of the flux-gate, which can be fixed in the flux-probe measuring coil with maximum values of the output signal amplitude variation (Fig. 2). The sinusoidal signal from the flux gate 3 enters the control unit 7, which determines the polarity of the flux gate signal and controls the operation of the switch.

If the output signal of a flux-gate of positive polarity, then the block of counters GK1 is defined as GK - “top” and its output through

the switch is connected to the input of the pulse counter GK - "top" and, accordingly, the block of meters GK2 is defined as the HA - "bottom" and its output through the switch is connected to the input of the pulse counter GK - "bottom".

With a negative polarity of the output signal of the flux gate, the control unit determines GK2 as GK - “top”, and GK1 as GK - “bottom” and, in accordance with this, performs switching.

Further, the output from the counters GK - "top" and GK - "bottom" is summed up in the block of pulse counters GK - "sum".

Analysis by the operator of the level of the output signals GK - "top" and GK - "bottom" allows you to determine the location of the boundary of the reservoir (figure 4) relative to the over-bit module located in the immediate vicinity of the bit, and control the drilling process.

Claims (1)

A device for monitoring the position of the horizontal wellbore, comprising gamma-ray (GK) sensors installed in the immediate vicinity of the bit, oriented at an angle of 180 ° to each other, and a flux probe located at an angle of 90 ° to the diametrical axis of the GK sensors, characterized in that these GK sensors and a fluxgate are located in a separate measuring over-bit module with a wireless electromagnetic communication channel and are equipped with an electronic circuit for matching fluxgate signals with pulses of GK sensors, containing: board, switch for switching pulses of GK sensors, pulse counters for GK, and also a total counter for pulses of GK, while the output of the measuring coil of the flux gate is connected to the input of the control unit that determines the polarity of the output signal of the flux gate and connected to the switch, which switches the transmission channels of the pulses of the gy counter from the polarity of the output signal of the flux-gate, to the corresponding pulse counters of the HA, designated as: HA - “top” or HA - “bottom”, the outputs of which are connected to the total m pulse counter GK - "sum" connected to the measuring circuit of the over-bit module.