Calculating method, calculating device and determining method of gas well effusion volume

Abstract

The invention discloses a calculating method of gas well effusion volume, and is applied in the technical field of oil field gas production. The method includes that S1, a calculating device reads basic parameters and production parameters of a gas well; S2, the calculating device calculates the bottomhole pressure according to the read parameters; S3, the calculating device calculates the annulus fluid volume according to the read parameters and the bottomhole pressure; S4, the calculating device calculates the fluid volume in an oil tube according to the read parameters and the bottomhole pressure. In addition, the calculating device calculates the bottom fluid volume according to the read parameters and the bottomhole pressure. The gas-well total fluid volume can be figured out by adding the annulus fluid volume the fluid volume in the oil tube and the bottom fluid volume. Compared with the prior calculating method, the calculating method has the advantages that influences of yield on formation pressure and wellhead pressure are considered, so that calculation accuracy is improved significantly. The invention further discloses a calculating device of the gas well effusion volume and a determining method of gas well effusion discharging.

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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