Abstract
Based on guaranteed allocation and the purpose of protecting casing of oil and water wells. According to the characteristics of horizontal well water injection, the horizontal well water injection is divided into three sections from the well head to the ground. According to the flow characteristics of each segment, the relation between the yield and the differential pressure sections were established. Finally, according to the principle of node analysis, the calculation method of injection pressure is obtained. According to the theoretical formula, a computer model for the calculation of the pressure in the horizontal well section is worked out, which is convenient and quick to calculate the reasonable water injection pressure of the wellhead.
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