Computational method of high-gas-liquid-ratio horizontal well critical liquid-carrying flow

Abstract

The invention relates to the technical field of oil and gas field gas production, in particular to a computational method of high-gas-liquid-ratio horizontal well critical liquid carrying flow. According to the computational method, the critical liquid-carrying flow rate of a vertical well section, a critical liquid-carrying flow rate of an inclined well section, and a critical liquid-carrying flow rate of a horizontal well section are computed, the one of the maximum value of the three flow rates is chosen as the critical liquid-carrying flow rate of a horizontal well, the horizontal well critical liquid-carrying flow is obtained according to a flow rate and flow computational formula to make computed critical liquid-carrying flow be larger than or equal to the actual critical liquid-carrying flow of the high-gas-liquid-ratio horizontal well, a worker can take corresponding treatment measures according to the computed values before liquid accumulates at the bottom of the well or at the early period of liquid accumulation at the bottom of the well to avoid affect caused to normal work of the gas recovery well by accumulation of formation water at the bottom of the well to the maximum degree, and working on the gas recovery well is stable as usual for sure; and the computational method of the high-gas-liquid-ratio horizontal well critical liquid carrying flow is simple in principle, easy to compute, and accurate in calculated value, and thereby being accurate and important basis for guidance in the high-gas-liquid-ratio horizontal well production technology in an oil and gasfield.

Description

technical field [0001] The invention relates to the technical field of gas recovery technology in oil and gas fields, in particular to a calculation method for the critical liquid-carrying flow rate of a horizontal well with a high gas-liquid ratio. Background technique [0002] During the production process of gas production wells in oil and gas fields, formation water is generally exported from the wellhead of gas production wells together with natural gas. However, when the production of gas production wells decreases, the gas flow velocity is not enough to carry formation water to the surface, resulting in accumulation of formation water at the bottom of the well, reducing In severe cases, the gas well will fail to produce. When the gas well begins to accumulate liquid, the minimum flow rate of the gas in the wellbore is called the critical liquid-carrying flow rate, and the corresponding flow rate is called the critical liquid-carrying flow rate. To ensure that the gas f...

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Problems solved by technology

[0005] The purpose of the present invention is: the calculation model for the existing critical liquid-carrying flow is difficult to apply to the calculation of the critical liquid-carrying flow of high gas-liquid ratio horizontal wells, resulting in The critical liquid-carrying flow rate of horizontal wells with high gas-liquid ratio cannot be accurately obtained, which affects the normal gas production of high gas-liquid ratio horizontal wells. A calculation method for critical liquid-carrying flow rate of high gas-liquid ratio horizontal wells is provided

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