Drilling-in oil and gas producing horizons involves contamination of the bottomhole formation zone with various solid fractions, as well as mud filtrate. Conventional process operations sometimes result in reservoir properties deterioration, a significant increase in exploration cost, and loss of time. These factors and a number of other ones deeply affect well construction workmanship in the abnormal thermobaric conditions of clay-bearing rocks.
Accident-free and complication-free drilling-in oil and gas producing horizons closely depends on the correct selection of the blend composition, structural-mechanical properties and colloid-chemical properties of the chemicals and chemical base drilling muds, as well as technological fluids. New technological solutions aimed at property regulation of the above systems are proposed. In particular, an analysis of state-of-the-art problems in the area of development and implementation of chemicals and chemical base drilling muds for abnormally high and low reservoir pressures was conducted. New ecologically sound and cost-effective reagents and drilling fluids on their basis, process liquids, lubricating compositions have been developed and tested based on the proposed methodological approach. Performance capabilities of nanotechnology were used at the development stages. Especially, for preserving reservoir properties in the process of drilling and development of productive layers, a composite weighting agent has been developed to replace barite, as well as a tannin agent that allows to regulate the rheological properties of drilling fluids, both in mineralized and highly mineralized dispersion media, perforating liquid compositions with surface-active properties, a nanostructured composition to regulate tribotechnological parameters of drilling fluids.
At present, the developed composition is successfully used in the process of well drilling in Azerbaijan.
References
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