The improvement of the quality of producing formations’ secondary drilling and informational support of their development throughout the entire time between repairs can be achieved by the implementation of a complex technology of wells’ completion. The technology includes underbalanced drilling under down-hole pumps and long-term monitoring of the formation and equipment parameters using geophysical self-contained cables and optical fibre lines. The use of optical fibre lines as a DTS (distributed temperature sensor) allows to measure the thermal field along the entire wellbore at the same time, which represents an important advantage to electronic sensors. However, the current lack of reliable optical fibre sensors for determining the pressure and fluid contents does not allow measuring the bottom-hole and formation pressure values or determining the intervals of water feeding and hydrodynamic formation parameters. The development of explosion-proof remote downhole devices allowed filling this gap and combining geophysical and hydrodynamic research methods with optical fibre thermometry. Such an approach allows for the secondary underbalanced drilling, bringing the wells to stable production and their operation based on the information received from geophysical and optical fibre sensors. This results in the material improvement of hydrodynamic efficiency ratio of the secondary drilling and prompt evaluation of the formation energy parameters.
The experience of production application of the integrated approach has proven that a distributed temperature gauge helps to determine the operation intervals and the location of behind-the-casing flows, to control the pump temperature and accurately measure the depths of dynamic levels. The information obtained using the downhole device allows to promptly manage the values of bottom-hole pressure (drawdown) and perform the calculations of the formations’ hydrodynamic parameters. The combined technology of wells completion and operation materially reduces the costs of secondary drilling and geophysical and hydrodynamic well research. This is achieved by avoiding direct losses of oil production that are inevitable in case of well shutdowns for the conventional perforation and research.
References
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