Читать книгу Acoustic and Vibrational Enhanced Oil Recovery - George V. Chilingar - Страница 20

The use of various seismic vibration techniques in Russia resulted in incremental oil production of millions of tons. There are several seismic vibration techniques for transmitting energy into the reservoir, with oscillations over long distance. The area of productive reservoir around the well-being stimulated may be as great as 12 km². The number of wells simultaneously subjected to the treatment can range up to 50 (depending on the well spacing).

The technique for increasing the oil yield of high water cut and low oil production reservoirs consists of subjecting the reservoir area to cyclic low-frequency (5 to 90 HZ) elastic oscillations within the frequency range corresponding to the reservoir resonance (Kouznetsov et al., 1998 [18]). The results obtained for during seven years of using this seismic vibration technique in different areas in Russia, on the average, annual oil production increased by more than 60%. The duration of the seismic vibration effect was 6 to 18 months and sometimes longer. The vertical reservoir sweep increased by 35%. In some cases, the wells that were producing by artificial lift (sucker rod pumps) retuned to natural flow with almost a tenfold rate increase. The effect was evaluated not only by an increase in the total production rate but also by a decrease in the waste cut. In some wells, the water cut decreased by 30% to 40% (Kouznetsov et al., 1998 [18]; Simkin and Surguchev, 1991 [31]).