Pressure monitoring method for judging incoming water direction of horizontal well

Abstract

The invention provides a pressure monitoring method for judging the incoming water direction of a horizontal well. The method comprises the following steps of monitoring well bottom pressure change data of the horizontal well; considering the change of working systems in the surrounding water injection wells, and designing interference testing wells among the water injection wells and the horizontal well; building a horizontal well bottom pressure analysis layout under the interference of the water injection wells; conducting fitting analysis on measured well bottom pressure data to obtain reservoir parameters under the condition that the water injection amounts of different water injection wells are changed, determining the communication situation among the wells by analyzing and comparing the parameters obtained through fitting under different working systems of the water injection wells, and judging the incoming water direction. The pressure monitoring method is simple, and easy to understand and operate, since the change of the water injection amounts of the water injection wells is considered, the incoming water direction of the horizontal well can be accurately judged; meanwhile, the pressure monitoring explain of the horizontal well through the method better conforms to actual conditions, and the precision of the pressure monitoring explain is improved.

Description

technical field [0001] The invention relates to the field of oil and gas production, in particular to the field of horizontal well oil production in low-permeability reservoirs. Background technique [0002] The combined injection-production method of vertical well water injection and horizontal well oil production has become a common phenomenon in the development of low-permeability reservoirs. Generally, the production of horizontal wells declines rapidly, and once water breaks through, the water cut rises rapidly. The water yield of horizontal wells can be effectively determined by the horizontal well geopotential method and the horizontal well test analysis method. [0003] In an injection-production unit, one horizontal well corresponds to multiple water injection wells. Although the water yield of the horizontal well can be determined, the existing pressure analysis method cannot accurately determine which water injection well the water comes from. [0004] For exampl...

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Problems solved by technology

However, the above-mentioned patents only provide the process string, and do not provide a specific method for judging the direction of water flow. However, using conventional methods, the existing models and methods for horizontal wells do not consider the interference of water injection wells. For the measured pressure derivative curve in the later stage of production Dropped features do not fit well

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