Abstract
Background Separation phenomena in the production string and the tubing string of oil producing wells play an essential role for the efficient operation of a submersible pump. The article discusses the separation of gas from oil when the pressure drops below the saturation pressure of oil with gas. In downhole conditions, gas is released from oil twice: lower the pump and above it, therefore, different ways of estimating this parameter are proposed. Most submersible pumps today are operated with a pressure at the pump intake below the oil’s saturation pressure of gas, therefore a liquid with a certain content of gas in a free form enters the pump. Adding a second pressure sensor to the existing configuration of thermo-manometric systems at the pump inlet allows to determine the pressure differential between the sensors, and therefore, to estimate the percentage of components of the gas-liquid system. The calculations performed in the article show that the completion of wells with pressure sensors with an accuracy of up to 0.001 atm significantly increases the information content of the «reservoir - well - pump» system and allows to quickly respond to changes in free gas content at the pump intake. Aims and Objectives: o to develop methods for bubble-point pressure determination in the well zone; o to develop a method for estimating the free gas content in a liquid at the submersible pump intake during operation of the deep pumping unit. Methods The component composition of the well production is estimated by the difference in the readings of pressure sensors located at a fixed distance from each other. The pressure in the sensor zone varies in two ways: by adjusting the submersible pump performance and by changing the liquid level in the annular space, as well as by moving the sensors along the tubing string using a lift and a geophysical cable. Results Methods are proposed for estimating bubble-point pressure in the zones below the submersible pump and higher, in the oil-well tubing. Тechnology for estimating the free gas content in the product received at submersible pump intake is presented.
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