This article focuses on introduction of the acid and proppant fracturing technology at the fields of Udmurtneft OJSC. It is known and justified that the hydraulic fracturing technology is efficient for stimulation of reservoirs. However, not all of the various existing methods of hydraulic fracturing (frac jobs) can be applied in the fields of the Udmurt Republic, as the fields of the region are deemed to be a risky area in terms of breakthrough into aquifers. Both proppant hydrofracturing, and the acid frac jobs are widely used, but there is currently no the proppant and acid hydrofracturing method. However nowadays this proppant and acid hydrofracturing method is an efficient way of reservoir stimulation. Therefore, the introduction of acid and proppant hydrofracturing technology has been reviewed as the solution to stimulate the carbonate formations in the oilfields of Udmurtneft OJSC.
Pilot testing of the technology in directional wells has shown the profitability of the said method of stimulation, despite the fact that the acid and proppant hydrofracturing technology in horizontal wells was tested in the oilfields of the Udmurt Republic for the first time.
The achieved results show that the technology may cover the greater well stock and oilfields. Besides, the successful performance of multi-stage acid and proppant hydrofracturing in two horizontal wells of Eseneiskoe and Mishkinskoe oilfields has expanded the scope of use of acid and proppant hydrofracturing, and has proven its efficiency in the areas deemed risky with regard to breakthrough in water—bearing horizons. The results have shown that consideration of the geological factors, reservoir properties and detailed designing of the operation makes it possible to carry out the acid and proppant hydrofracturing in horizontal wells without breakthrough in aquifers.
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