Abstract
As the development of reserves of traditional oil takes place, an important component of the raw material base is the reserves of highly viscous oil and natural bitumen, one of the effective methods for the development of which is the SAGD technology. This paper is devoted to optimizing the length of the horizontal section of wells with the SAGD technology using numerical modeling for one of the fields of high-viscosity Caribbean oil and finding the analytical dependence of the technological characteristics of the method on the parameters of the wells. The solution of the tasks was carried out using a thermohydrodynamic simulator «CMG STARS» (Computer Modeling Group). The paper presents the results of calculations to determine the optimal rate of steam injection and the length of a horizontal wellbore at the SAGD, as well as the analytical dependence of the technological characteristics of the parameters of the well, which can be used for an initial assessment of the effectiveness of technology for specific geological and physical conditions in this area.
Highlights
The most important component of the raw material base of the oil industry of the countries of the world are stocks of heavy and bituminous oils
Oval areas colored in different colors correspond to a definite range of changes in cumulative oil production depending on the steam injection rate and the length of the horizontal wellbore
The resulting graphoanalytical dependence can be considered as the primary method for assessing the effectiveness of SAGD for specific geological and physical conditions of a given field
Summary
The most important component of the raw material base of the oil industry of the countries of the world are stocks of heavy and bituminous oils. The most common among thermal methods are steam thermal methods of influence, in particular, steam and gravity drainage of the reservoir or SAGD (steam-assisted gravity drainage) - the main method of extracting natural bitumen. This technology [4,5,6] uses two horizontal wells, which are drilled in parallel near the bottom of the formation at a distance of 5–10 m one above the other (Fig. 1). Steam having a relatively low density rises and the steam chamber grows to the top of the seam After that, it continues to expand in the horizontal direction. To achieve the maximum technological and economic efficiency of the method, it is necessary to optimize the well length and the volume of injected steam
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