Old well crack synchronous re-fracturing production increasing method

The invention discloses an old well crack synchronous re-fracturing production increasing method. The old well crack synchronous re-fracturing production increasing method is different from a traditional method of fracturing only for one well each time, and is used for fracturing two or more adjacent oil wells in an oil reservoir area at the same time. According to the old well crack synchronous re-fracturing production increasing method, firstly energy is integrally supplemented to a plurality of wells, and the formation pressure of the oil reservoir area instead of a single well point is improved; secondly, the multiple adjacent wells are synchronously fractured, fracturing fluid is injected, the formation pressure near wellbores and cracks is remarkably increased, a stress shielding effect is generated, and the situation that when one well is fractured, the cracks are unidirectionally protruded or excessively extended to communicate with the cracks of the other well is avoided; andthirdly, the oil wells ar