Device and method capable of simulating underground true environment to test gas-liquid separation efficiency of centrifugal pump

A real environment and testing device technology, applied in pump control, non-variable pumps, machines/engines, etc., can solve the problems of inaccurate simulation results, inability to simulate centrifugal pumps and gas-liquid separators, etc., to achieve convenient measurement and realization The effect of online real-time detection

Active Publication Date: 2018-03-20
QINGDAO INST OF MARINE GEOLOGY
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Problems solved by technology

[0006] Aiming at the problem that the simulation results are not accurate enough due to the inability to simulate the real working environment of the centrifugal pump and the gas-liquid separator in the current experimental research on the gas-liquid separation efficiency of the centrifugal pump, the present invention proposes a method for simulating the real environment of the downhole for the centrifugal pump Gas-liquid separation efficiency test device, the system can simulate the two-phase flow state of gas and water in the wellbore during the hydrate production process, test the gas-liquid separation efficiency under different gas contents, and provide a basis for the optimal design of the artificial lift scheme for hydrate production in accordance with

Method used

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  • Device and method capable of simulating underground true environment to test gas-liquid separation efficiency of centrifugal pump
  • Device and method capable of simulating underground true environment to test gas-liquid separation efficiency of centrifugal pump

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Embodiment 1

[0028] Embodiment 1 provides a device for testing the gas-liquid separation efficiency of centrifugal pumps by simulating the real downhole environment, such as figure 1 with 2 As shown, it includes an underground simulated well 1, a water tank 2, an air compressor 7, a vacuum deaerator 16, and a centrifugal pump control and data collector 23.

[0029] The wellhead of the underground simulated wellbore 1 is sealed by a wellhead ring plate 26, and a second casing 25 and a first casing 24 are sequentially arranged in the underground simulated wellbore 1 from inside to outside, and the first casing 24 is close to the underground simulation The inner wall of the wellbore 1 is arranged, an annulus 27 is formed between the first casing 24 and the second casing 25, and the tops of the first casing 24 and the second casing 25 are respectively sealed with the wellhead ring plate 26. Wherein, the first sleeve 24 uses a 16" sleeve, and the second sleeve 25 uses a 9-5 / 8" sleeve.

[0030] A wat...

Embodiment 2

[0040] Corresponding to the device of Embodiment 1, Embodiment 2 provides a method for testing the gas-liquid separation efficiency of a centrifugal pump by simulating a real downhole environment, including the following steps:

[0041] S1. Check and calibrate each instrument and equipment to make it in normal working condition;

[0042] S2. Fill the water tank with water, turn on the pipeline pump, and fill the underground simulated wellbore with water;

[0043] S3. Turn on the air compressor to inject gas into the underground simulated wellbore at a fixed flow rate;

[0044] S4. Turn on the centrifugal pump. After the gas-liquid mixture in the underground simulated wellbore passes through the gas-liquid separator, it is lifted to the ground by the centrifugal pump. After passing through the vacuum deaerator, the water returns to the water tank and the gas is discharged to the outside;

[0045] S5. Measure the amount of gas separated by the gas-liquid separator and the amount of gas se...

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Abstract

The invention relates to the technical field of ocean natural gas hydrate resource development engineering, in particular to a device and method capable of simulating an underground true environment to test the gas-liquid separation efficiency of a centrifugal pump. The device comprises an underground simulation shaft, a water tank, an air compressor, a vacuum degasser and a centrifugal pump control and data acquisition device. According to the device and the method, a test on the influence of gas on the performance of the centrifugal pump in the hydrate exploitation process can be realized. The underground simulation shaft is established in the device, water which contains gas at a certain proportion is injected into the underground simulation shaft, a gas-water two-phase flow state in the underground simulation shaft in the hydrate exploitation process can be simulated, characteristic curves of the gas-liquid separation efficiency of the centrifugal pump at different gas containing proportions can be simulated in the true working environment, and a basis is provided for the design of artificial lifting for hydrate exploitation.

Description

Technical field [0001] The invention relates to the technical field of marine natural gas hydrate resource development engineering, in particular to a test device and method for simulating the real environment of a downhole to perform centrifugal pump gas-liquid separation efficiency. Background technique [0002] Natural gas hydrate has a wide range of distribution, huge amount of resources, and high energy density. It is expected to become a high-efficiency clean energy to meet human energy needs in the future. [0003] The trial production of natural gas hydrate shows that the electric submersible centrifugal pump is an effective artificial lifting method for hydrate decompression mining, but the gas produced by the decomposition of hydrate has a great influence on the performance of the centrifugal pump: when the centrifugal pump is lifted When the liquid contains gas, the head and efficiency of the pump will decrease, and the greater the gas content, the greater the impact; th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D15/00
CPCF04D15/0088Y02E10/10
Inventor 吴能友万义钊黄丽胡高伟陈强王代刚李彦龙卜庆涛
Owner QINGDAO INST OF MARINE GEOLOGY
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