CN-121993152-A - Method and related device for quantitatively judging whether slug flow occurs in gas well based on fluctuation of liquid discharge parameters

CN121993152ACN 121993152 ACN121993152 ACN 121993152ACN-121993152-A

Abstract

The invention belongs to the technical field of oil and gas field exploration and development, and discloses a method and a related device for quantitatively judging whether a slug flow occurs in a gas well based on fluctuation of liquid discharge parameters, wherein the method and the related device acquire the liquid discharge parameters of the gas well acquired according to preset metering frequencies, calculate wellhead pressure fluctuation values at adjacent moments, wellhead pressure fluctuation percentages at adjacent moments and gas-liquid ratio fluctuation values at adjacent moments according to the liquid discharge parameters of the gas well, and determine whether the liquid flow in the gas well enters the slug flow according to the calculated values. The invention can be widely used for various natural gas well drainage measures and system guidance, and the parameters such as pressure, liquid production, gas production and the like and fluctuation thereof are quantized in the drainage process of the gas well after reservoir transformation and in the production stage, so that the flow state of the gas well is judged, the optimal time for the drainage system and measure adjustment is determined, and the subsequent drainage system is optimized.

Inventors

XU XIAOCHEN
WANG YIWEI
WEN XIAOYONG
ZHANG KUANGSHENG
LIU HANBIN
YE LIANG
LI MING
ZHAO QIANYUN
MOU CHUNGUO
WANG YAJUAN

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (10)

1. The method for quantitatively judging whether the flow state in the gas well has the slug flow or not based on the fluctuation of the liquid discharge parameters is characterized by comprising the following steps: Acquiring gas well drainage parameters acquired according to preset metering frequency, wherein the gas well drainage parameters comprise wellhead pressure, gas production and liquid production at different moments in the gas well drainage stage; According to the wellhead pressure, the gas production amount and the liquid production amount at different moments, calculating wellhead pressure fluctuation values at adjacent moments, wellhead pressure fluctuation percentages at adjacent moments and gas-liquid ratio fluctuation values at adjacent moments; And determining whether the well flow enters the slug flow according to the wellhead pressure at each moment, the wellhead pressure fluctuation value at the adjacent moment, the wellhead pressure fluctuation percentage at the adjacent moment and the gas-liquid ratio fluctuation value at the adjacent moment.
2. The method for quantitatively judging whether the flow state in the gas well has the slugging flow or not based on the fluctuation of the liquid discharge parameters according to claim 1, wherein the calculation mode of the wellhead pressure fluctuation value at the adjacent moment is as follows: Wherein, the Is the pressure fluctuation value of the wellhead at the adjacent moment, Is the wellhead pressure at time i, Is the wellhead pressure at the time immediately preceding time i.
3. The method for quantitatively judging whether the flow state in the gas well has the slugging flow or not based on the fluctuation of the liquid discharge parameters according to claim 1, wherein the calculation mode of the percentage of the fluctuation of the wellhead pressure at the adjacent moment is as follows: Wherein, the As a percentage of the wellhead pressure fluctuation at adjacent times, Is the wellhead pressure at the moment immediately preceding moment i, For wellhead pressure at time i Is a difference between (a) and (b).
4. The method for quantitatively judging whether the flow state in the gas well has the slugging flow or not based on the fluctuation of the liquid discharge parameters according to claim 1, wherein the gas-liquid ratio fluctuation value at the adjacent moment is calculated as follows: Wherein, the Is the fluctuation value of the gas-liquid ratio at the adjacent moment, The gas-liquid ratio at the moment i is, The gas-liquid ratio at the time immediately before the time i, For the gas production at wellhead pressure at time i, The fluid production is the wellhead pressure at time i.
5. The method for quantitatively judging whether the flow state in the gas well is in the slugging state or not based on the fluctuation of the liquid discharge parameters according to claim 1, wherein the process for determining whether the flow state in the gas well is in the slugging state or not according to the wellhead pressure at each moment, the wellhead pressure fluctuation value at the adjacent moment, the wellhead pressure fluctuation percentage at the adjacent moment and the gas-liquid ratio fluctuation value at the adjacent moment comprises the following steps: When the wellhead pressure fluctuation value at the adjacent moment or the wellhead pressure fluctuation percentage at the adjacent moment is increased by more than a first preset multiple and the wellhead pressure is reduced to be below the preset percentage of the open-hole pressure, judging that the well fluid enters the slug flow; Or when the fluctuation value of the gas-liquid ratio at the adjacent moment is increased by more than a second preset multiple and the wellhead pressure is reduced to be lower than the preset percentage of the open-well pressure, judging that the flow state in the well enters the slug flow; otherwise, judging that the flow state in the well does not enter the slug flow.
6. The method for quantitatively determining whether a slug flow occurs in a gas well based on fluctuation of drainage parameters according to claim 5, wherein the first preset multiple is 3 times, the second preset multiple is 3 times, and the preset percentage is 50%.
7. The method for quantitatively judging whether slug flow occurs in the gas well based on fluctuation of the liquid discharge parameters according to claim 1, wherein the preset metering frequency is 1-60 times per hour.
8. The system for quantitatively judging whether the flow state in the gas well has slugging or not based on the fluctuation of the liquid discharge parameters is characterized by comprising the following components: The data acquisition unit is used for acquiring gas well liquid discharge parameters acquired according to preset metering frequency, wherein the gas well liquid discharge parameters comprise wellhead pressure, gas production amount and liquid production amount at different moments in the gas well liquid discharge stage; The calculation unit is used for calculating wellhead pressure fluctuation values at adjacent moments, wellhead pressure fluctuation percentages at adjacent moments and gas-liquid ratio fluctuation values at adjacent moments according to the wellhead pressure, gas production and liquid production at different moments; And the judging unit is used for determining whether the well fluid enters the slug flow according to the wellhead pressure at each moment, the wellhead pressure fluctuation value at the adjacent moment, the wellhead pressure fluctuation percentage at the adjacent moment and the gas-liquid ratio fluctuation value at the adjacent moment.
9. An electronic device, comprising: One or more processors; A storage device having one or more programs stored thereon; The one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of determining whether a slug flow occurs in a gas well based on a fluctuation quantification of a drainage parameter of any of claims 1 to 7.
10. A storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the method of quantifying whether a slug flow occurs in a gas well based on fluctuations in drainage parameters as claimed in any one of claims 1 to 7.

Description

Method and related device for quantitatively judging whether slug flow occurs in gas well based on fluctuation of liquid discharge parameters Technical Field The invention belongs to the technical field of oil and gas field exploration and development, and particularly relates to a method and a related device for quantitatively judging whether slug flow occurs in a gas well based on fluctuation of liquid discharge parameters. Background In the liquid drainage and gas test stage after reservoir transformation and the later stable production stage, the gas well is required to drain by utilizing the self energy of the stratum under the condition of limited pressure and gas source. The produced water can cause serious harm to the production of a gas well, including yield decrease, production stopping of a flooded well and the like, and is one of important factors affecting the stable production of the gas field. In order to realize stable liquid carrying of a shaft for a long time, the problem of limited capacity due to liquid carrying of the shaft is avoided, the extraction degree of a gas reservoir is improved, and reasonable liquid drainage measures and systems have an important forward function on stable drainage. The drainage system after the reservoir reformation of the gas well is commonly adopted at present is that a phi 3-8mm oil nozzle is adopted to control the open flow according to the pressure change condition at the initial drainage stage after the construction is finished, the discharge capacity is 100-200-300 l/min, and the production pipe column and other auxiliary tools and measures are adopted for drainage at the middle and later stages and the production stage. However, the timing of intervention and adjustment of different drainage systems mainly depends on experience and prediction, and a quantitative judgment method is lacking. Disclosure of Invention In order to solve the problems in the prior art, the invention aims to provide a method and a related device for quantitatively judging whether the flow state in a gas well has slugging or not based on the fluctuation of liquid discharge parameters. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: A method for quantitatively judging whether slug flow occurs in a gas well based on fluctuation of liquid discharge parameters comprises the following steps: Acquiring gas well drainage parameters acquired according to preset metering frequency, wherein the gas well drainage parameters comprise wellhead pressure, gas production and liquid production at different moments in the gas well drainage stage; According to the wellhead pressure, the gas production amount and the liquid production amount at different moments, calculating wellhead pressure fluctuation values at adjacent moments, wellhead pressure fluctuation percentages at adjacent moments and gas-liquid ratio fluctuation values at adjacent moments; And determining whether the well flow enters the slug flow according to the wellhead pressure at each moment, the wellhead pressure fluctuation value at the adjacent moment, the wellhead pressure fluctuation percentage at the adjacent moment and the gas-liquid ratio fluctuation value at the adjacent moment. Preferably, the calculation mode of the wellhead pressure fluctuation value at the adjacent moment is as follows: Wherein, the Is the pressure fluctuation value of the wellhead at the adjacent moment,Is the wellhead pressure at time i,Is the wellhead pressure at the time immediately preceding time i. Preferably, the calculation mode of the percentage of the wellhead pressure fluctuation at the adjacent moment is as follows: Wherein, the As a percentage of the wellhead pressure fluctuation at adjacent times,Is the wellhead pressure at the moment immediately preceding moment i,For wellhead pressure at time iIs a difference between (a) and (b). Preferably, the gas-liquid ratio fluctuation value at the adjacent time is calculated as follows: Wherein, the Is the fluctuation value of the gas-liquid ratio at the adjacent moment,The gas-liquid ratio at the moment i is,The gas-liquid ratio at the time immediately before the time i,For the gas production at wellhead pressure at time i,The fluid production is the wellhead pressure at time i. Preferably, the process of determining whether the well fluid enters the slug flow according to the wellhead pressure at each moment, the wellhead pressure fluctuation value at the adjacent moment, the wellhead pressure fluctuation percentage at the adjacent moment and the gas-liquid ratio fluctuation value at the adjacent moment comprises the following steps: When the wellhead pressure fluctuation value at the adjacent moment or the wellhead pressure fluctuation percentage at the adjacent moment is increased by more than a first preset multiple and the wellhead pressure is reduced to be below the preset percentage of the open-hole pressure, judging that the well f