The article presents the results of the development and practical application of DM5007MP digital pressure sensor when it is used as part of KP-90 the perforation control device (ACS-EXPERT LLC, Tomsk). This equipment was used while exploring oil wells at the facilities of the Siberian Geophysical Company. The developed sensor meets the strict requirements of operational and metrological characteristics: the extended operating temperature range from 5 to 120 °С; the sensor response rate (the measured pressure value must be transmitted with a period of 80 ms via the digital interface); the sensor consumption should not exceed 5 mA; the total error reduced to the pressure measurement range should not exceed 0.5% over the entire operating temperature range. Operating conditions: working environment: reservoir oil, water, water with solid particles; range of ambient temperatures from 5 to 120 °С; the maximum hydrostatic pressure is 60 MPa.
The restriction to the sensor size in the downhole equipment: diameter is less than 60 mm; the length is less than 100 mm.
One of the main elements of the sensor that provides its metrological characteristics reliability and stability under the specified operating conditions is the pressure sensor. As a pressure sensor, a strain-gauge type D (VIP Company, Ekaterinburg) was selected. Another important component of the sensor design is a microcontroller. A thorough review of the existing microcontrollers was carried out and XEMICS XE88LC05 microcontroller was selected. In economy versions of the sensor, STM32F373CCT6 microcontrollers are also used. In addition, based on the import substitution, principle we studied the modification of the device with the K1986BE92QI microcontroller that was manufactured in Russia. This microcontroller is close by its main performance characteristics to the foreign analog. The method developed by the authors to reduce the measurement error and based on the calibration algorithms and the sensor model use made it possible to obtain the required metrological and operational parameters of the sensor.
