Method for calculating gas phase flow by utilizing gas holdup of low-yield gas well

A technology for gas holdup and gas production wells, applied in flow/mass flow measurement, liquid/fluid solid measurement, measurement devices, etc., which can solve problems such as the influence of start-up speed, large fluctuations in the logging curve of the central turbine flowmeter, etc., and achieve accurate Calculation, the effect of small error

Inactive Publication Date: 2017-04-26
SOUTHWEST PETROLEUM UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

When there is water-carrying flow in the gas well, the log curve of the central turbine flowmeter fluctuates greatly. In addition, the turbine flowmeter is seriously affected by the start-up speed in low-production wells
Therefore, under t

Method used

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  • Method for calculating gas phase flow by utilizing gas holdup of low-yield gas well
  • Method for calculating gas phase flow by utilizing gas holdup of low-yield gas well
  • Method for calculating gas phase flow by utilizing gas holdup of low-yield gas well

Examples

Experimental program
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Embodiment

[0150] Table 1 Actual production logging data of Well A in a certain area

[0151] Starting depth (m) Termination depth (m) Y G

[0152] Gas production Q at the wellhead G =12950m 3 / d, produced water Q L =4.2m 3 / d, gas volume coefficient B G =1 / 127.139, water volume coefficient B L =1.02, formation water density ρ L =1.074g / cm3, gas density ρ G =0.127g / cm3, the acceleration of gravity g=9.796m / s 2 , casing inner diameter d=12.46cm, instrument outer diameter 3.8cm, water interfacial tension σ=60mN / m.

[0153] because Y G less than 0.8, the ρ L , ρ G Substitute into formula (27) to get:

[0154]

[0155] The daily gas production in the wellbore substituted into formula (21) is:

[0156] Q G = v Y G ·PC

[0157] =108.599m 3 / d

[0158] The daily gas production at the wellhead is:

[0159] Q=Q G / B G =13807.2m 3 / d

[0160] It is known from the above formula that the invention has a better application effect in calculating the gas phase flo...

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Abstract

The invention relates to a method for calculating a gas phase flow by utilizing a gas holdup of a low-yield gas well. The method is characterized in that a hydrodynamic parameter calculation model under a flowing state is especially practically established according to a basic multiphase flow theory model. The method comprises the following steps according to the conditions: S1) collecting the related data of the gas well, including gas holdup, pipe diameter, gas and liquid density, gas and liquid surface tension and local gravitational acceleration; S2) judging gas and liquid two-phase flow type, wherein when the gas holdup is less than 0.8, the flow is static liquid and is a gas upward flowing foamy flow, and when the gas holdup is more than 0.8, the flow is a gas-carrying-water sectional blocking flow; and S3) utilizing a gas flow formula to calculate a gas phase flow QG of a low-yield gas-carrying-water well according to a judging result of the step S2). According to the method provided by the invention, the gas phase flow of the low-yield gas-carrying-water well can be calculated; a new physical model system is established; the calculation result is accurate; and the method can effectively meet the onsite requirement.

Description

technical field [0001] The invention relates to a method for calculating gas phase flow by using gas holdup in a low-yield gas well, and belongs to the technical field of oil and gas field development. Background technique [0002] In the process of oil and gas field development, well logging is required to determine downhole parameters. For gas wells, the traditional method is to use a series of seven parameters (natural gamma ray, magnetic signal, temperature, pressure, density, gas holdup, turbine flow rate) for logging. Among them, the density, gas holdup and turbine flow data are mainly used to determine the phase holdup and flow of each phase of the fluid. For general gas wells, this logging series is effective, and its logging data can accurately determine the gas production profile. However, when the gas well production is low, the trace water produced in the formation will accumulate at the bottom of the well to form a hydrostatic column, and when the liquid level...

Claims

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Application Information

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IPC IPC(8): G01F1/74
CPCG01F1/74
Inventor 戴家才邓仁双秦昊李康朱绍武
Owner SOUTHWEST PETROLEUM UNIV
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