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Method for judging whether gas well carries fluid normally or not

A gas well and normal technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as inaccurate calculation of critical liquid-carrying flow

Inactive Publication Date: 2018-05-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the invention is to overcome the inaccurate calculation of the critical liquid-carrying flow rate of the water-producing gas well in the Sulige gas field by the existing model

Method used

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  • Method for judging whether gas well carries fluid normally or not
  • Method for judging whether gas well carries fluid normally or not
  • Method for judging whether gas well carries fluid normally or not

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0024] This embodiment provides a method for judging whether a gas well carries liquid normally. The critical liquid-carrying flow formula is deduced according to the droplet model, and the critical liquid-carrying flow rate of the gas well is calculated. Compared with the actual production of the gas-producing well, if the critical liquid-carrying flow rate is greater than If the actual production is lower than the actual production, the liquid carrying is abnormal, and the gas well will accumulate liquid. If the critical liquid carrying flow rate is less than the actual production, the gas well will carry liquid normally.

[0025] The invention calculates the minimum liquid-carrying flow rate of the gas well through the liquid droplet model, and judges whether the gas well accumulates liquid based on this. The invention proposes a new type of liquid-carrying droplet model for gas wells. The droplet model is an oblate spheroid. The projection of the model in the vertical direc...

Embodiment 2

[0027] On the basis of Example 1, this example provides a method for judging whether the gas well carries liquid normally, and deduces the critical flow velocity υ of the droplet according to the droplet model of the oblate spheroid and the force balance of the droplet in the critical state formula:

[0028]

[0029] The critical liquid-carrying flow formula is: Among them, g represents the acceleration of gravity, unit: m / s 2 ; d represents the inner diameter of the tubing, unit: m; p represents the wellhead oil pressure, unit: MPa; z represents the compressibility factor under the pressure and temperature of the tubing, dimensionless; T represents the temperature, unit: K; ρ l Indicates the density of the droplet, unit: Kg / m 3 ; ρ g Indicates the gas density, unit: Kg / m 3 ;σ represents the surface tension of natural gas and liquid droplets, unit: N / m; C D Indicates the drag coefficient, dimensionless.

[0030] Among them, the method of obtaining each parameter is a...

Embodiment 3

[0034] A well carried out a flow pressure test on March 19, 2016, and its test output was 1.2×10 4 m 3 / d, the oil pressure at the wellhead is 12.385MPa, and the temperature is 288.3K; the diameter of the tubing in this well is 62mm, the relative density of natural gas is 0.6, the compressibility factor z at this temperature and pressure is 0.753, and the density of the produced water in this block is 1009Kg / m 3 , Substituting the above data into the formula:

[0035]

[0036] The calculated critical liquid-carrying flow rate of the well is 2.2×10 4 m 3 / d, greater than gas well test production 1.2×10 4 m 3 / d, so the gas well is liquid-loaded; in the flow pressure test, there are two flow pressure gradients in the wellbore, 0.106MPa / 100m and 0.928MPa / 100m, and the liquid level depth of the gas well is 2198.28m. The theoretical settlement results are consistent with the actual test results.

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Abstract

The invention provides a method for judging whether a gas well carries fluid normally or not. According to a liquid droplet model, a critical fluid-carrying flow formula is derived, the critical fluid-carrying flow of the gas well is calculated, compared with the actual yield of a gas producing well, if the critical fluid-carrying flow is larger than the yield, the gas well carries fluid abnormally, fluid is accumulated in the gas well, and if the critical fluid-carrying flow is smaller than the yield, the gas well carries fluid normally; if the liquid droplet model is in an oblate-spheroid shape, the projection, in the vertical direction, of the model is in a regular circular shape, and the projection, in the horizontal direction, of the model is in an oval shape. The critical fluid-carrying flow value obtained by the method can more accurately judge the fluid accumulation condition of the water-production gas well in the Sulige gas field, and compared with other kinds of calculationresults, the critical fluid-carrying flow value obtained by the method is more reliable.

Description

technical field [0001] The invention belongs to the technical field of oil and gas reservoir engineering, and in particular relates to a method for judging whether a gas well carries liquid normally. Background technique [0002] At present, the judgment of the timing of liquid accumulation in gas wells is mainly based on the calculation of the minimum liquid-carrying flow rate of the gas well through the droplet model, and based on this, it is judged whether the gas well is liquid-loaded. However, when various models are used for calculation, sometimes the calculation results cannot accurately reflect the fluid accumulation of gas wells, which seriously affects the identification of gas well fluid accumulation. [0003] Turner published Analysis and prediction of minimum flowrate for the continuous removal of liquids from gas wells in JPT magazine in 1969. (Analysis and prediction of the minimum continuous liquid carrying speed of gas wells), Turner first proposed the liqui...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 杨辉于占海袁颖婕孙岩岩李鹏刘鹏程刘会会张波
Owner PETROCHINA CO LTD
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