Oil well liquid level measuring apparatus

A liquid level measurement device and oil well technology, applied in measurement, wellbore/well components, earthwork drilling and production, etc., can solve the problems that cannot meet the pressure recovery test of low-production wells, cannot fully meet the pressure recovery test, etc.

Active Publication Date: 2011-01-12
PETROCHINA CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

For the pressure recovery test, it usually takes 7 to 20 days for continuous measurement; for low-production wells, it takes more than 20 days. It is very inconvenient and cannot fully meet the requirements of pressure recovery tests, especially the requirements of pressure recovery tests for low-production wells

Method used

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  • Oil well liquid level measuring apparatus
  • Oil well liquid level measuring apparatus
  • Oil well liquid level measuring apparatus

Examples

Experimental program
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Effect test

Embodiment Construction

[0063] Oil well liquid level measurement devices using spread spectrum technology such as figure 1 shown. The device adopts a microphone (frequency response range 20-20000Hz) and a speaker (rated power is about 3-5W, frequency range 90-18000Hz), and a trumpet-shaped cover is made of thin steel sheet, the large end is connected to the speaker, and the small end is connected to a soft steel pipe Send the signal downhole.

[0064] The spread spectrum system uses the m sequence as the spread spectrum code, the code length is 28706, the code clock frequency is 1k, and the carrier frequency is 1342Hz, that is, the frequency band used by the spread spectrum system is 122-2562Hz. The maximum measurement distance of the system (according to the speed of sound 340m / s):

[0065] R max =4000(m)

[0066] Minimum distance resolution:

[0067] ΔR = 1 2 cT c ≈ 0.14 ...

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Abstract

The oil well liquid level depth measuring device for oil production in oil field consists of a computer, a D / A converter, a power amplifier, a loudspeaker, a microphone, an adjustable amplifier, an A / D converter, a horn cover and a flexible steel hose. It features the computer includes a PN code generator, one local code generator, a phase comparator, a correlation judging unit, a phase regulatorand a carrier modem. The liquid level depth measurement includes the following steps: phase modulating the carrier with PN code, sending the sound wave through the transducer to the well target, receiving the reflected sound signal with the well head microphone and treating the reflected sound signal.

Description

technical field [0001] The invention relates to a device for measuring the depth of the liquid level of an oil well in the oil production process of an oil field. Background technique [0002] At present, domestic and foreign liquid level testing methods mainly use shooting guns (bullets or high-pressure gas cylinders) at the wellhead to generate sound waves, and use receivers installed at the wellhead—microphones (high-sensitivity microphones) to receive echoes. Determine the depth of the liquid surface. Due to the good diffusion of the spherical wave and the rapid attenuation in the downhole, it is difficult to measure the deep well, and the test data is inaccurate. At present, the liquid level measurement equipment produced in my country can achieve a maximum measurement depth of 2500m. When the liquid level depth is greater than 2500m, the measurement results are unreliable or impossible to measure. Especially for low-yield wells, since the position of the downhole liq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/04
Inventor 雷小强杨江天
Owner PETROCHINA CO LTD
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