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Gas monitoring device and method for carbon dioxide flooding gas channeling

A carbon dioxide and gas monitoring technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of low detection sensitivity, poor stability, poor selectivity, etc.

Pending Publication Date: 2020-02-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiment of the present invention is to provide a gas monitoring device and monitoring method for carbon dioxide driving gas channeling, the first purpose of which is to solve the problems of low detection sensitivity, poor selectivity and poor stability of conventional carbon dioxide gas concentration detection instruments; its purpose The second is to solve the problem of single gas detection

Method used

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  • Gas monitoring device and method for carbon dioxide flooding gas channeling

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no. 1 approach

[0026] Such as figure 1 As shown, the first embodiment of the present invention relates to a gas monitoring device for carbon dioxide driving gas channeling, which includes an oil-gas separation buffer tank 1, and the oil-gas separation buffer tank 1 has three tank ports, which are respectively an oil inlet, an outlet An oil port and an air outlet, the oil inlet is connected to the casing, the oil outlet is opened at the bottom of the tank and connected to the dirty oil pool 2, and the air outlet is opened at the top of the tank and connected to two gas pipelines, one of which is The gas pipeline is connected to the inlet of the compressor 3, the outlet of the compressor 3 is connected to the downstream gathering and transportation pipeline, another gas transmission line is connected to the inlet of the drier filter 4 through the pipeline, and the outlet of the drier filter 4 is connected to the exhaust pipeline 5, and the exhaust gas The pipe wall of the pipeline 5 is connect...

no. 2 approach

[0035] A gas monitoring device for carbon dioxide driving and gas channeling, which includes an oil-gas separation buffer tank 1. The oil-gas separation buffer tank 1 has three tank ports, which are respectively an oil inlet, an oil outlet and a gas outlet. The oil inlet is connected to the sleeve The oil outlet is opened at the bottom of the tank and connected to the dirty oil pool 2, and the gas outlet is opened at the top of the tank and connected to two gas pipelines, one of which is connected to the inlet of compressor 3 and the outlet of compressor 3 Connect the downstream gathering and transportation pipeline, and another gas transmission pipeline is connected to the inlet of the drier filter 4 through the pipeline, and the outlet of the drier filter 4 is connected to the exhaust pipeline 5, and the pipe wall of the exhaust pipeline 5 is connected to the sampler through a bypass pipeline 6. A gas sensor group capable of detecting the concentration of various gases is ins...

no. 3 approach

[0041] Different from the first embodiment, the pipeline between the oil-gas separation buffer tank 1 and the dry filter 4 is equipped with a pressure gauge 11 and a pressure reducing valve 12 from upstream to downstream, and the pressure gauge 11 is used to detect the separation of the oil-gas separation buffer tank 1 If the gas pressure exceeds the preset value, the pressure reducing valve 12 is opened to ensure the safe operation of the entire monitoring device.

[0042] In order to realize the accurate real-time transmission of the detection data of the monitoring device and simplify the equipment, the concentration of various gases collected by the RTU data acquisition module 7 is transmitted to the terminal 9 through the wireless transmission module 8, and the terminal 9 is a computer.

[0043] In order to meet the requirements of safety and environmental protection, the compressor 3 is a two-stage compressor, which is composed of a low-pressure stage and a high-pressure ...

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Abstract

The invention discloses a gas monitoring device and method for carbon dioxide flooding gas channeling. The gas monitoring device is mainly composed of a carbon dioxide sensor, a carbon monoxide sensorand a hydrogen sulfide sensor, the carbon dioxide gas concentration, the carbon monoxide gas concentration and the hydrogen sulfide gas concentration can be collected in real time, all the gas sensors adopt electrochemical gas sensors or infrared gas sensors, infrared detection elements and electrochemical detection elements have the advantages of high stability and high precision, the gas concentrations can be transmitted to a terminal accurately while all the gas concentrations are collected in real time, the change of the content of all gas is displayed at the terminal, the gas channelingtime of carbon dioxide and the situation of changing of the gas channeling degree of the carbon dioxide along with the time are accurately monitored, and the gas monitoring device and method are of great significance for timely discovery and prevention of gas channeling.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a gas monitoring device and a monitoring method for carbon dioxide driving gas channeling. Background technique [0002] For low-permeability oilfields, the effect of gas injection development is better than that of water injection, but whether gas channeling can be detected and prevented in time during the gas injection development process is the key factor for the success of gas injection development. Once gas channeling occurs, it will not only waste manpower Material resources will also cause irreversible losses to the oil well. [0003] In order to detect carbon dioxide gas escape in time, a series of carbon dioxide detection devices are often used in mines to detect the concentration of carbon dioxide gas. When the concentration exceeds a certain value, the device will alarm, and it is considered that carbon dioxide gas channeling has occurred. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/34E21B49/08
CPCE21B43/34E21B49/08
Inventor 刘笑春何治武杨海恩谭俊领毕卫宇王石头程辰杨飞涛李曼平
Owner PETROCHINA CO LTD
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