Device for measuring pressure during well-boring

FIELD: well boring, particularly for measuring pressure in well during drilling thereof.

SUBSTANCE: device has body with central flushing orifice and grooves. Arranged in the grooves are electrical circuits and positive pressure transducers isolated by pressure-resistant shell. The first pressure transducer is connected with central flushing orifice in tube, another one - with annular tube space. The device is provided with power source and two differential amplifiers with outputs connected to summing unit inputs. Supply diagonal units are linked correspondingly with power source inputs. The first units of measuring diagonals of the first and the second pressure transducers are connected correspondingly with inverting and non-inverting inputs of the first differential amplifier. The second units of measuring diagonals of the first and the second pressure transducers are linked correspondingly to inverting and non-inverting inputs of the second differential amplifier. The first and the second pressure transducers may be arranged in the body at 0°-45° and 153°-180° angles to vertical device axis correspondingly or may be inversely arranged. The body may be formed of titanic alloy.

EFFECT: increased measuring reliability.

4 cl, 2 dwg

 

The proposal relates to the field of study wells in the drilling process, namely, devices for measuring differential pressure.

Known sensors for measuring pressure differential General purpose, for example Metran-43-DD (product catalogue “automation”. The group Metran, Chelyabinsk, 1995, str/7-5). Here, the pressure difference causes deformation of the sensing element which is firmly bonded with the membrane of lansoprazole. The strain gages are connected in a bridge circuit.

Geometrical dimensions of these sensors do not meet the requirements of the downhole equipment, and these sensors are not suitable for operation in conditions of high excess pressure.

Known sensors are used to measure pressure during geophysical surveys of wells (Geophysical equipment. VIP, 1981, str). Sensor design provides for placing it in the device lowered on wireline in the borehole, where it measures the pressure.

These sensors can be measured differential pressure based on the measurement of gauge pressure at two points and calculate the desired differential pressure by algebraic subtraction of one of the measured pressure values from the other.

However, this method of measuring differential pressure is low feelings of the activities, the result is a lack of definition.

The present invention solves the problem of increasing the sensitivity of the differential pressure gauge and reliability of the measurements.

The problem is solved by the proposed device for measuring the pressure in the drilling process, consisting of a body with a Central flushing hole. In the body cavity are electrical circuits and sensors, isolated from contact with the well fluid barstock casing, in which the gauge pressure is connected by a channel with a Central hole in the pipe, the second gauge pressure is connected by a channel with Struble, and which is provided with a first differential amplifier, the second differential amplifier, adder, and a power source, the nodes of the supply diagonal of the pressure sensors are connected respectively to the inputs of the power source, the first node of the measuring diagonal of the first sensor is connected to the not inverting input of the first differential amplifier, the first node of the measuring diagonal of the second sensor is connected to the inverting input of the first differential amplifier, a second site measuring diagonal of the first sensor is connected to the inverting input of the second differential amplifier, the second node measuring diag is the presence of a second sensor connected to the not inverting input of the second differential amplifier, the output of the first amplifier connected to the first input of the adder, the output of the second amplifier is connected to the second input of the adder. The pressure sensor which is connected with the Central flushing hole located in the housing at an angle from 0° to 45° the vertical axis of the device, the pressure sensor which is connected with Struble, is located in the housing at an angle of between 135° to 180° the vertical axis of the device. The location of the sensors relative to the vertical axis, if necessary, can be and Vice versa. The device is made of titanium alloy.

Figure 1 shows the block diagram of the differential pressure gauge, figure 2 - General view of the device for measuring the pressure in the drilling process.

The proposed device consists of a casing 1 (adapter drill pipe) with a through channel 2 for drilling fluid. On the housing 1 is marastoni casing 3 with the sealing elements 4 and the insulator 5, the grooves 6 of the housing 1 are electrical circuits. The first gauge pressure 7 through the channel inlet pressure 8 communicates with the flushing port 2 pressure P1the second gauge pressure 9 through the channel inlet pressure 10 communicates with the annular space pressure P2. The pressure sensor 7 which is connected with the Central flushing hole 2, is the housing at an angle α 0° to 45° the vertical axis of the device, the pressure sensor 9 which is connected with Struble, is located in the housing at an angle β 135° to 180° the vertical axis of the device. The location of the sensors relative to the vertical axis, if necessary, can be and Vice versa. The first gauge pressure 7 for measuring the pressure in the pipe has a measuring bridge 27 formed by the strain gauges 11, 12, 13 and 14. A second pressure measuring pressure in the turns, has a measuring bridge 15, which is formed by the strain gages 16, 17, 18 and 19. The nodes of the supply diagonal of the pressure sensors are connected respectively to the inputs of the power source 20. The first node 21 of the measuring diagonal of the first sensor 7(27) is connected to the not inverting input of the first differential amplifier 22. The first node 23 of the measuring diagonal of the second sensor 9(15) is connected to the inverting input of the first differential amplifier 22. The second node 24 of the measuring diagonal of the first sensor 7(27) is connected to the inverting input of the second differential amplifier 25. The second node 26 of the measuring diagonal of the second sensor 9(15) is connected to the not inverting input of the second differential amplifier 25. The output of the first amplifier 22 is connected to the first input of the adder 28, the output of the second amplifier 25 is connected to the second input of the sum is atora 28.

The device operates as follows.

The gage pressure 7(27) and 9(15) measured pressure P1and R2respectively, P1>R2. The sensors are powered from the power source 20. Nodes positive increment signal 21 and 23 is connected to the inverting and not inverting inputs of the differential amplifier 22, respectively, and the nodes are negative increment signal 26 and 24 is connected to the inverting and not inverting inputs of the differential amplifier 25, respectively. This connection gives the maximum sensitivity for differential pressure measurement with two sensors pressure, and it is possible thanks to the precise manufacture of strain gauges measuring bridges sensors using integrated technology. The positive effect of non-traditional sensors excessive pressure increases due to supply output signals from the amplifiers 22 and 25 to the adder 28.

Consider the case of a differential pressure measurement based on the measurement of gauge pressure at two points and calculate the desired differential pressure by algebraic subtraction of one of the measured pressure values from the other.

For example, the output diagonal of the sensor 7(27) and 9(15) is not loaded, then

where Up1 and Up2 in the output signals of the sensors 7(27) and 9(15), respectively, Uon - reference voltage.

Differential pressure will be equal to:

As the measuring bridge all four shoulder active, then the sensor 7(27) have

where R is the resistance of the strain gages in the absence of excess pressure, ΔR is the increment of the resistance of the strain gauges of the sensor 7(27) when exposed to excessive pressure, ΔR’ is the increment of the resistance strain gauges sensor 9(15) when exposed to excessive pressure.

Consider the dierential pressure sensors 7(27) and 9(15) according to scheme 1. For example, operational amplifiers 22, 25 have ideal characteristics. Then true expression:

After substituting (4) and (5) to (7) and the conversion will receive

Thus, the differential pressure measurement according to the scheme 1 increases the sensitivity in (ΔR+ΔR’)/(ΔR-ΔR') times.

The pressure sensor 7 which is connected with the Central flushing hole 2 located in the housing at an angle α 0° to 45° the vertical axis of the device, the pressure sensor 9 which is connected with Struble, is located in the housing at an angle β 135° to 180° the vertical axis of the device. The location of the sensors relative to the vertical axis of the ri can be and Vice versa.

This arrangement of pressure sensors in the device avoids the direct impact of water hammer on the membrane sensors, which arise due to centrifugal accelerations during drilling, as the channels for supplying pressure become local resistance (GOST 8.563.1-97).

The buildings of the pressure sensors are manufactured from titanium alloy (Lansoprazole. Technical description and operating instructions. VMIU). In order to match the temperature coefficients of linear expansion, the device for measuring the pressure in the drilling process is also made of titanium alloy.

Ultimately, the scheme of differential pressure measurement allows you to measure the differential pressure gage pressure with high sensitivity, and the proposed location of the sensors and the case of the titanium alloy to enhance the reliability of the measurements.

1. Device for measuring pressure in the drilling process, consisting of a body with a Central flushing hole and located in the grooves of the housing electrical circuits and measuring sensors, isolated barstock casing, characterized in that the first pressure associated with the Central flushing hole in the housing, the second gauge pressure associated with Struble, in addition, it is provided with a first differential amplifier, the second differential amplifier, integrator and power supply, while the supply nodes of the diagonals of the excess pressure sensors connected respectively to the inputs of the power source, the first node of the measuring diagonal of the first gauge pressure is connected to the not inverting input of the first differential amplifier, the first node of the measuring diagonal of the second gauge pressure is connected to the inverting input of the first differential amplifier, the second node of the measuring diagonal of the first gauge pressure is connected to the inverting input of the second differential amplifier, the second node of the measuring diagonal of the second gauge pressure is connected to the not inverting input of the second differential amplifier, the output of the first differential amplifier connected to the first input of the adder, the output of the second differential amplifier connected to the second input of the adder.

2. The device according to claim 1, characterized in that the gauge pressure which is connected with the Central flushing hole located in the housing at an angle from 0 to 45° the vertical axis of the device, and the gauge pressure which is connected with Struble, is located in the housing at an angle of 135 to 180&x000B0; the vertical axis of the device.

3. The device according to claim 1, characterized in that the gauge pressure which is connected with the Central flushing hole located in the housing at an angle of 135 to 180° the vertical axis of the device, and the gauge pressure which is connected with Struble, is located in the housing at an angle from 0 to 45° the vertical axis of the device.

4. The device according to claim 1, characterized in that the casing is made of titanium alloy.



 

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FIELD: well boring, particularly for measuring pressure in well during drilling thereof.

SUBSTANCE: device has body with central flushing orifice and grooves. Arranged in the grooves are electrical circuits and positive pressure transducers isolated by pressure-resistant shell. The first pressure transducer is connected with central flushing orifice in tube, another one - with annular tube space. The device is provided with power source and two differential amplifiers with outputs connected to summing unit inputs. Supply diagonal units are linked correspondingly with power source inputs. The first units of measuring diagonals of the first and the second pressure transducers are connected correspondingly with inverting and non-inverting inputs of the first differential amplifier. The second units of measuring diagonals of the first and the second pressure transducers are linked correspondingly to inverting and non-inverting inputs of the second differential amplifier. The first and the second pressure transducers may be arranged in the body at 0°-45° and 153°-180° angles to vertical device axis correspondingly or may be inversely arranged. The body may be formed of titanic alloy.

EFFECT: increased measuring reliability.

4 cl, 2 dwg

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6 cl, 2 dwg

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12 cl, 11 dwg, 2 ex

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9 cl, 3 dwg

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1 dwg

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12 cl, 7 dwg

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