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HPHT coiled tubing casing collar locator enhancement via digital signal processing techniques for accurate depth control in wire-line well interventions
Keywords: High temperature down-hole measurement tools, Real-time digital signal processing, HPHT casing collar locator
Down-hole oil and gas operators require a precise depth control method during well interventions. Wire-line technologies using conventional coiled tubing casing collar locator (CCL) have been proven effective. However, extremely high pressure and high temperature (HPHT) environments make this a challenging task. Operators usually seek for new technologies as the potential problem solvers, in this manner, pretermit improvements to the older technologies that could offer cost efficient alternatives. Two factors have been instrumental in influencing this work. The former is that wire-line inductive CCLs embedded in down-hole measurement tools accurately verifies collar locations in a tubing string by inducing current or voltage pulses that are sent to data acquisition systems located in the surface to graphically record dynamic wire-line information. The latter is related to the supply of high temperature components, which is growing and today is possible to find high temperature passive and active elements, as well as high density integrated circuits such as microcontrollers and digital signal processors (DSP). Particularly, high temperature DSP have made possible to leverage the flexibility not only in electronic designs, but also in the development of novel algorithms that were not available before. DSP integrated circuits allow enhancing filed proven techniques such as inductive CCLs. This work describes a HPHT down-hole tool that use a conventional inductive coiled tubing CCL enhanced by a DSP based electronic module that performs in real-time DSP techniques such as digital filtering, auto-correlation and cross-correlation, which permit to store and transmit analog or digital information to a data acquisition system located in the surface. The obtained laboratory tests results of the enhanced CCL down-hole tool, using changes in temperature from 75 °C – 185 °C, provide a firm basis for testing and evaluating the system in the field.
Rito Mijarez, Research group leader
Instituto de Investigaciones Eléctricas
Cuernavaca, Morelos
Mexico


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