Pressure monitoring method used for judging incoming-water-direction of multistage fracturing horizontal well

Abstract

The invention provides a pressure monitoring method used for judging the incoming-water-direction of a multistage fracturing horizontal well. The pressure monitoring method comprises the following steps of monitoring bottom hole pressure change data of the multistage fracturing horizontal well; considering the change of the work systems of surrounding water injection wells, and designing an interference testing well between the water injection wells and the multistage fracturing horizontal well; building a bottom hole pressure analysis chart of the multistage fracturing horizontal well under the interference of the water injection wells; conducting fitting analysis on the measured bottom hole pressure data to obtain crack and reservoir parameters on the condition that the water injection amount of different water injection wells is changed, determining the communication conditions among wells, and judging the incoming-water-direction by analyzing and comparing the parameters which arefitted under the work systems of different water injection wells. The pressure monitoring method used for judging the incoming-water-direction of the multistage fracturing horizontal well is simple, understandable, and easy to operate. Since the change of the water injection amount of the water injection wells is considered, the incoming-water-direction of the multistage fracturing horizontal wellcan be accurately judged; meanwhile, using the method to monitor the pressure of the multistage fracturing horizontal well better conforms to actual conditions, and the accuracy of pressure monitoring explanation is improved.

Description

technical field [0001] The invention relates to the field of oil and gas exploitation, in particular to the field of multistage fracturing horizontal well oil production in low-permeability and tight oil reservoirs. Background technique [0002] The combined injection-production method of vertical well water injection and multi-stage fracturing horizontal well production has become a common phenomenon in the development of low-permeability and tight oil reservoirs. Generally, the production of multi-stage fracturing horizontal wells declines rapidly. rate rose rapidly. The water production position of the multi-stage fractured horizontal well can be effectively identified by the ground potential method of the horizontal well and the fluid production position diagnosis method of the multi-stage fractured horizontal well. [0003] In an injection-production unit, a multi-stage fractured horizontal well corresponds to multiple water injection wells. Although the water outlet l...

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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. Using conventional methods, the existing models and methods for multi-stage fracturing horizontal wells do not consider the interference of water injection wells. The characteristic fitting effect of the measured pressure derivative curve decline is not good

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