«Geology, geophysics and development of oil and gas fields»

The pick-up profile of steam injection wells of the Yaregskoye field during development by the underground-surface method

UDC: 622.276.652
DOI: -

Authors:

¹ Ukhta State Technical University, Ukhta, Russia

Keywords: high viscous oil, areal steam injection, underground-surface method, steam injection well, geophysical study of a well

Annotation:

The involvement in the active development of reserves of high-viscous oils and natural bitumen is one of the priorities for the oil industry development, despite the fact that these reserves significantly exceed the reserves of light oils their potential is not being used enough.

The world experience of the deposits development of high-viscous oils and bitumen has shown that the thermal methods are the most promising technology for their development.

The thermal methods are mostly used in the Komi Republic. The Yaregskoye field and permo-carbon deposit of the Usinskoye field are under industrial development here. Over the more than 50-year period of the Yaregskoye field the development by the thermal mining technology application (thermoshaft method), extensive experience has been accumulated in the field of new technologies practical development.

One of the new technologies of oil fields development by the thermal mining technology application is the underground surface system. The fundamental difference between the underground surface system and other thermal mining systems is the injection of steam through wells drilled from the surface. Oil production is carried out through a system of producing wells in mine workings (galleries). Currently, most of the Yaregskaya area of the Yaregskoye field is being developed by the underground-surface method with a relatively small steam-oil ratio.

One of the factors for thermal methods successful application is a high coefficient of heat use, that is, the ratio of the amount of heat spent on heating the formation to its total amount. When pumping coolant from the surface, the greatest coefficient of heat use will be if the formation warms up evenly throughout the thickness and losses to the roof and bottom will be minimal.

To assess the input profile (thickness heating uniformity) of steam injection wells of the Yaregskaya area of the Yaregskoye field, geophysical studies were carried out. The results of these studies made it possible to evaluate the thermobaric conditions of the coolant, its input in the range of reservoir thickness and the presence of possible leakages in the structure. According to the results of the research, some specific features of the Yaregskaya area formation heating were established, the presence of hydrodynamic connections between steam injection wells was determined. For one of the large sites, the input profile was assessed as a whole. Proposals have been formulated for more efficient use of thermal energy pumped into the reservoir.

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