Experimental Method and Analysis of Steam Flow State at Critical Injection Nozzles in Thick Oil Reservoirs

Liaohe oilfield thick oil production of about 6 million tons of oil per year, 95% of which rely on the injection of steam thermal recovery. However, with the deepening of the development, the plane and longitudinal use of uneven contradiction is becoming more and more prominent, and the serious problem of steam breakthrough, for this reason, the balanced injection of steam technology research work. The balanced steam injection device is one of the important tools of this technology, which is used to achieve steam breakthrough suppression, optimization of liquid production profile and balanced control of steam injection, and its core component is the steam control nozzle. In this paper, a laboratory scale model of the oilfield prototype is obtained by scaling down the size of the prototype according to the similarity principle to carry out physical simulation studies. The physical phenomena in the experimental process are analyzed to study the effects of nozzle size, injection flow rate, injection temperature, and dryness on the steam flow characteristics of the steam control nozzle, based on which the rationality of the steam control nozzle is analyzed. The study shows that the difference between the indoor test data and the theoretical calculation data is less than 5%, which indicates that the theoretical calculation model established in this paper is reasonable; the pressure drop loss of the steam control nozzle is ≤ 10%, which meets the requirements of field engineering use.