【国外硕士】An Analytical Model for Cyclic Steaming of Horizontal Wells

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Title:An Analytical Model for Cyclic Steaming of Horizontal Wells
Author:Ling Liang

Year:2005

Degree:MS

Abstract:

In recent years, the combined application of horizontal wells and steam injection for heavy-oil production is of increasing interest. The advantage of cyclic steam injection is large thermal efficiency because produced fluids flow from the relatively cool reservoir to the heated well. Moreover, adverse steam breakthrough at production wells is obviated. In this report, a wellbore heat loss and cyclic steam recovery calculator is developed. The calculator has two functions. First, it calculates the heat loss along the wellbore from the surface to the reservoir. Second, it is an analytical model for cyclic steam stimulation of a horizontal well. The wellbore heat loss calculation is based on standard heat transfer theory. Steam temperature profile, steam fraction profile, as well as heat loss along the wellbore are calculated. With regard to oil production calculations, the analytical model is applicable to a single horizontal well in a heavy-oil reservoir. The main driving force for production is gravity drainage of oil along the steam-oil contact zone and through the steam zone. Properties that influence the computed oil production rate include oil viscosity as a function of temperature, effective permeability, geometry of the heated zone, porosity, mobile oil saturation, and thermal diffusivity of the reservoir. The change in reservoir temperature with time is also modeled, and it leads to the expected decline in oil production rate during the production cycle as the reservoir temperature decreases. Appropriate correlations are incorporated to minimize data requirements. A limited comparison of results between the model and field results as well as thermal numerical reservoir simulation is made.

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