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Apparatus for measuring corrosion rate of down-hole string by flue gas, and its application

A corrosion rate and downhole pipe string technology is applied in the field of devices for measuring the corrosion rate of flue gas to downhole pipe strings, and can solve the problems of inability to accurately simulate the composition of multi-component systems in downholes.

Active Publication Date: 2014-09-10
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the devices used to study corrosion by weight loss method are relatively simple, and cannot be used to simulate the corrosivity of flue gas in assisted heavy oil production by flue gas injection. % N 2 , 10%-15% CO 2 , 4%-6% O 2 , and SO 2 , SO 3 , HCl, etc., considering the dissolution of gas, under laboratory conditions, only according to Dalton's law of partial pressure, it is impossible to accurately simulate the composition of the downhole multi-component system

Method used

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  • Apparatus for measuring corrosion rate of down-hole string by flue gas, and its application
  • Apparatus for measuring corrosion rate of down-hole string by flue gas, and its application
  • Apparatus for measuring corrosion rate of down-hole string by flue gas, and its application

Examples

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Effect test

Embodiment 1

[0058] A device for measuring the corrosion rate of flue gas on downhole tubular strings, including a gas source part, a gas mixing part and a reactor 40 that simulates a corrosive environment;

[0059] The gas source part includes a nitrogen gas source 1, an oxygen gas source 6, and a carbon dioxide gas source 11;

[0060] The gas mixing part includes a mixing pressurized container 16;

[0061] The reaction kettle 40 for simulating a corrosive environment includes a kettle body, an experimental rotating part axially arranged in the kettle body, and a motor 32 for driving the experimental rotating part. The experimental rotating part includes a rotor 38 and a hanger 39. The motor 32 includes a speed controller 33 and a magnetic transmission device 34; a rubber sealing sheet and a ball valve are arranged on the top of the kettle body; the ball valve is installed vertically on the top of the kettle body, and a rubber sealing sheet is encapsulated on the ball valve ;

[0062] The nitrog...

Embodiment 2

[0071] A device for measuring the corrosion rate of downhole tubing string by flue gas as described in embodiment 1, the difference is that the pipeline between the nitrogen gas source 1 and the mixing and pressurizing container 16 is sequentially provided with a first decompression Valve 2, first gas mass flow meter 3 and first one-way check valve 5;

[0072] A second pressure reducing valve 7, a second gas mass flow meter 8 and a second one-way check valve 10 are sequentially arranged on the pipeline between the oxygen gas source 6 and the mixing and pressurizing container 16;

[0073] A third pressure reducing valve 12, a third gas mass flow meter 13, and a third one-way check valve 15 are sequentially arranged on the pipeline between the carbon dioxide gas source 11 and the mixing and pressurizing container 16.

Embodiment 3

[0075] A working method of the device for measuring the corrosion rate of flue gas to the downhole tubular string as described in embodiment 1, including the following steps:

[0076] (1) With reference to the standard JB / T7901. The uniform corrosion total immersion test method of metal materials laboratory, the downhole pipe string to be tested is processed into the sample to be tested that meets the above standards, and the sample to be tested is punched to measure the The pre-test quality of the test sample M; fix the sample to be tested on the hanger;

[0077] (2) Install the hanger rack on the rotor, and then seal the reactor that simulates the corrosive environment;

[0078] (3) Open the valve on the pipeline between the mixing pressurized container and the reactor that simulates the corrosive environment, the valve on the pipeline between the vacuum gauge and the reactor that simulates the corrosive environment, and the valve on the vacuum pump end respectively;

[0079] Turn o...

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Abstract

The invention relates to an apparatus for measuring the corrosion rate of a down-hole string by flue gas. The apparatus comprises a gas source portion, a gas mixing portion and a corrosion environment simulation reaction kettle; the gas source portion comprises an oxygen source, a nitrogen source and a carbon dioxide gas; the gas mixing portion comprises a mixing pressurized container; and the corrosion environment simulation reaction kettle comprises a kettle body, experimental rotating parts axially arranged in the kettle body, and a motor driving the experimental rotating parts, and the experimental rotating parts comprise a rotor and a film hanger. The apparatus can simulate the real corrosion conditions of the down-hole string in flue gas assisted viscous oil recovery, and can meet the test of the corrosivity of the flue gas under different conditions.

Description

Technical field [0001] The invention relates to a device for measuring the corrosion rate of flue gas to a downhole pipe string and its application, and belongs to the technical field of oil and gas field development. technical background [0002] Flue gas injection assisted heavy oil recovery is an effective measure to increase crude oil production and ultimate recovery. Heavy oil occupies a large proportion of the world's oil and gas resources. At present, the main methods of producing heavy oil are steam flooding, steam huff and puff, SAGD, etc. The flue gas of steam injection boilers is directly discharged into the atmosphere in the existing steam flooding process. In fact, the flue gas can be used to drive oil. When the flue gas is used to assist heavy oil production, the flue gas contains CO 2 , O 2 , SO 2 Other corrosive gases, injection wells and production wells will have different degrees of corrosion, and even the downhole casing will be corroded and perforated, causi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
Inventor 杨肖曦秦国顺李松岩麻涛李威郭龙江
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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