Calculation method, calculation device and determination method of gas well liquid volume

Abstract

The invention discloses a method for calculating the fluid volume of a gas well, which is applied to the technical field of oilfield gas recovery. The method specifically includes: S1: the calculation device reads in the basic parameters and production parameters of the gas well; S2: the calculation device calculates the bottom hole flow pressure according to the read parameters; S3: the calculation device calculates the loop pressure according to the read parameters and the bottom hole flow pressure. Amount of liquid accumulation in the air; S4: the calculation device calculates the amount of liquid accumulation in the tubing according to the read-in parameters and the bottomhole flow pressure. In addition, the calculation device calculates the amount of liquid at the bottom according to the read-in parameters. The total liquid accumulation in the gas well is calculated by adding the liquid accumulation in the annular space, the liquid accumulation in the tubing and the bottom liquid accumulation. Compared with the original calculation method, the calculation method considers the influence of production and formation pressure on the wellhead pressure, so the calculation accuracy has been significantly improved. In addition, the invention also discloses a calculation device for the amount of liquid accumulation in a gas well and a method for determining the liquid accumulation in a gas well.

Description

technical field [0001] The invention relates to the field of natural gas exploitation, in particular to a calculation method, a calculation device and a method for determining liquid accumulation in gas wells. Background technique [0002] During the development process of gas reservoirs at home and abroad, formation water is produced to varying degrees. If the produced water cannot be discharged from the wellbore of the gas well in time, it will accumulate at the bottom of the gas well, resulting in fluid accumulation. After the gas well has fluid accumulation, on the one hand, it increases the flow resistance of the gas, reduces the gas well productivity, and in severe cases will cause the gas well to stop production; on the other hand, the long-term fluid accumulation will cause serious pollution to the formation. Therefore, in the process of gas well production, it is an important content of gas field dynamic monitoring to timely detect the position of the liquid level ...

AI Technical Summary

Problems solved by technology

The change of gas well production and formation pressure will affect the change of bottom hole flow pressure, wellhead tubing pressure and casing pressure, so the first basic assumption does not match the actual situation

In addition, the pressure of the flowing gas at the bottom of the hole and the pressure change of the wellhead tubing and casing are not only related to liquid accumulation, but also closely related to gas well production and formation pressure, so the second basic assumption is not consistent with the actual situation.

Under the above assumptions, without considering other influencing factors such as gas well production and formation pressure, there will inevitably be a large error in the liquid volume calculated by simply using the liquid pressure formula

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