Signal processing algorithm for thermal drift compensation in high-temperature down-hole instrumentation systems

Down-hole oil and gas industry requirements for measuring thermodynamic and geophysical parameters, for instance pressure, temperature, vibration and multiphase flow, are challenging. Accomplishing these necessities requires a complete signal communications chain of high-performance components and effective signal processing communication techniques to provide system reliability. Nevertheless, noise interference, cable attenuation and thermal drift of the front-end passive electronic elements can lead to poor signal-to-noise ratio (SNR) and possibly loss of the communication link. This paper describes a signal processing algorithm implemented in a bidirectional communication system that exchanges data from a down-hole high pressure and high-temperature (HPHT) measurement tool to the surface installation. The communication channel is a multi-conductor coaxial logging cable also used as a power supply transmission line. The instrumentation system consists of a proprietary down-hole measurement tool, composed of an HPHT sensor and a high-temperature digital signal processor (DSP)-based electronic device; located in the surface installation is a data-acquisition equipment. The system employs a signal processing algorithm, based on the frequency domain SNR characterization of the whole communication chain, which determines in real time the optimal carrier frequency that is automatically implemented in the selected modulation/demodulation technique. The obtained laboratory test results of the down-hole tool, using changes in temperature from 25° to 185°C, provide a firm basis for testing and evaluating the system in the field.

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Communication system for down-hole measurement tools based on real-time SNR characterization in coaxial cable used as communication channel

Additional Conferences (Device Packaging HiTEC HiTEN & CICMT) ◽

10.4071/hiten-tp14 ◽

2013 ◽

Vol 2013 (HITEN) ◽

pp. 000174-000183 ◽

Cited By ~ 2

Author(s):

Rito Mijarez ◽

David Pascacio ◽

Ricardo Guevara ◽

Olimpia Pacheco ◽

Carlos Tello ◽

...

Keyword(s):

High Temperature ◽

Real Time ◽

Communication System ◽

High Performance ◽

Communication Channel ◽

Oil And Gas ◽

Electronic Device ◽

Coaxial Cable ◽

Measurement Tool ◽

Communication Link

Down-hole oil and gas industries are important users of high temperature electronics. In these applications the operating temperature is function of the underground depth of the wells. Oil reservoirs in Mexico are located at mean depths of 6,000 m and the typical geothermal gradient is 25°C/km, however in some areas it is greater. Consequently, the requirements for measuring thermodynamic and geophysical parameters, for instance pressure, temperature, vibration and multiphase flow, are a challenging task. Accomplishing these necessities requires a complete signal communications chain of high-performance components and effective communication techniques to provide system reliability. Nevertheless, noise interference, cable attenuation and thermal drift of the front-end passive electronic elements can lead to poor signal-to-noise ratio (SNR) and possibly loss of the communication link. This paper describes a bidirectional communication system that exchanges data from a down-hole high pressure and high temperature (HP/HT) measurement tool to the surface installation. The communication channel is a multi-conductor coaxial logging cable used also as a power supply transmission line. The system consists of a proprietary down-hole measurement tool, composed of a HP/HT sensor and a high temperature DSP-based electronic device; and located in the surface installation, a data acquisition equipment. The system employs a communication algorithm, based on the SNR characterization of the whole communication chain, which determines in real-time the optimal carrier frequency that is automatically implemented in the selected modulation/demodulation technique. The obtained laboratory tests results of the down-hole tool, using changes in temperature from 25 °C – 185 °C, provide a firm basis for testing and evaluating the system in the field.

Download Full-text