Author(s)

Xu Xin

Corresponding Author

Xu Xin

ABSTRACT

With the progress of the technical level of oil development, the application of horizontal wells is becoming more and more common. It is the key to improve the overall movement of the reservoir by using the horizontal well. The multipoint steam injection string of the horizontal well is a commonly used downhole component for high efficiency steam injection of the thermal recovery horizontal well. A reasonable layout of the valves to ensure an even steam output of each point is still not well designed. At present, a general design method which is urgently necessary isn’t applied by each factory. According to the balance relationship of the momentum, the energy and the mass of the fluid flowing in the string, the pressure distribution equation of the fluid flowing in the multipoint steam injection string is built. On the basis of this equation, the design calculation method of the multipoint steam injection string is come up with. A specific example is given in the paper. Study shows that, with the equation built in this paper, the string can be designed with each axial valve having the same output, so that the technical demand of an even steam injection of the horizontal well section can be met.

KEYWORDS

Horizontal well, multipoint steam injection, pressure, calculation