DEVICE AND METHOD FOR EXTRACTING LAYER FLUID FROM WELLS Russian patent published in 2004 - IPC

FIELD: oil extraction equipment. SUBSTANCE: method includes pumping of layer fluid into inlet of inletting device in amount of no more than well's estimated output and also includes pumping of gas, which is located freely in layer fluid, in amount from 25% to 100% of amount pumped into inlet of inletting device. In inletting device gas is mixed with fluid in such a way that gas bubbles formed during the process are too small for forming gas-locks blocking operation of immersible centrifugal pump, which normally operates in practically optimal mode in terms of productiveness. Nominal pump productiveness is no less than 30 cubic meters per 24 hours. Disperser is connected to the lower section of pump. Disperser is formed with capability of forming uniform gas and fluid mixture when amount of layer fluid pumped into disperser inlet is no more than 25% to 100% of layer fluid amount. For case of gas amount of more than 100% of fluid amount, gas separating device is mounted before the pump for taking a part of gas into space behind pipe and pumping of uniform gas and fluid mixture with gas amount of no less than 25% into pump inlet. EFFECT: possible extraction of oil from low output wells by means of centrifugal pumps with increased selection effectiveness. 2 cl, 2 dwg