Method for determining heavy oil thermal recovery steam chamber state

Abstract

The invention relates to a method for determining a heavy oil thermal recovery steam chamber state and monitoring oil reservoir exploitation in oil development. The method includes making a three-dimensional view by using heavy oil reservoir production means data, determining a projection reference face, extracting projection coordinates of a steam injection well and a production well on a projection face, recording stage yield data of different time steps of the production well, combining and summating the projection coordinates of the production well and the stage yield data of the different time steps to obtain an accumulated injection and extraction interpolation result of a corresponding time point and determine the heavy oil thermal recovery steam chamber state of an exploitation area. The method truly reflects the actual development situation of the oil reservoir, reduces effects of well shutdown on the interpolation result, objectively reflects steam chamber distribution in heavy oil exploitation and effectively reduces investment.

Description

technical field [0001] The invention relates to a technology for monitoring oil reservoir development in oil development, in particular to a method for determining the shape of a heavy oil thermal recovery steam chamber. Background technique [0002] Crude oil in heavy oil reservoirs has high viscosity, it is difficult to flow in the oil layer, and it is very difficult to develop. However, the viscosity of crude oil will decrease rapidly with the increase of temperature, so thermal recovery is generally used for development. At present, the commonly used thermal recovery methods mainly include steam huff and puff, steam flooding, and steam assisted gravity drainage (SAGD). The steam huff and puff method is to inject a certain amount and dryness of hot steam into the heavy oil layer, then shut down the well and let the injected hot steam heat the heavy oil layer, and then reopen the well after a certain heating time to exploit the heated underground crude. This method is ec...

AI Technical Summary

Problems solved by technology

The temperature observation well can directly and accurately measure the specific temperature value at the well point, and determine the development of the steam cavity at the well point through the physical state equation, but the shape and development of the steam cavity between wells cannot be determined

In addition, temperature observation requires drilling of special temperature observation wells, which is very costly

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