During the process of super heavy oil exploitation in Tahe oil field, when mixing light oil, due to heavy oil and light oil entering into pump from separator directly, the existing ESP string leads to poor mixing and heavy oil coming into the pump, as a result, the pump detection period is greatly shorten; when water injection-production, the injected water can contact with electrical cable and motor directly, causing serious damage to the cable and motor, and the pump detection period is also greatly shorten. This paper designs a new type of ESP string, adding a ESP dome, a sieve tube, a mixing device, an intelligent switch and a direct flushing valve, which can improve the mixing effect of heavy oil and light oil, avoid the injected water directly contacting with electrical cable and motor, in order to protect the electrical cable and motor, improve their service life, extend the pump detection period and reduce production costs. Field test showed that the pump detection period has been prolonged after using the new ESP string, it is recommended to promote the use.
Carbon isotope characterization of powder river basin coal bed waters: Key to minimizing unnecessary water production and implications for exploration and production of biogenic gas
