The Vostochno-Alinskoye field was discovered in 2007 and is located in the Lensky District of the Republic of Sakha (Yakutia). The Khamakin regional productive horizon (reservoir B10) is the main object of oil and gas production at this field. Productive reservoir B10 is represented by a hydrophobic deposit with low permeability, abnormally low reservoir temperatures and pressure, with natural fractures. Analysis and research show that the use of water-based drilling muds when opening the Khamakin horizon reduces the reservoir properties and negatively affects the productivity of the well. The experience of using brine when drilling wells showed that a significant number of production wells did not reach the estimated potential productivity with a deviation of up to several tons per day. Based on the data obtained, research results, analysis and experience during drilling and completing of wells on the Khamakin horizon, a technology has been developed, tested and implemented that allows opening a productive formation using an oil-based mud (OBM) without negative impact on the reservoir. The technology assumes a change in the design of wells. This decision made it possible to significantly increase the initial flow rates of wells brought in from drilling.
The article discusses the results of the application of the proposed technology for the period from 2016. To assess the efficiency of the well drilling technology in the equilibrium (depression) mode on OBM in comparison with traditional methods (using water-based solutions), the productivity of the drilled wells was analyzed. It was found that the productivity of the wells of the Khamakin horizon drilled using OBM is higher than with the use of traditional technology. In addition, the use of the new technology makes it possible to reduce the well development time by more than 1.5 times.
The technology for construction of wells on the Khamakin horizon using OBM can be replicated in other fields with similar properties of productive formations.
References
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