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Method for cleaning glass electrode used for on-line measurement of pH value of drilling fluid

A glass electrode, drilling fluid technology, applied in the direction of electrochemical variables of materials, etc.

Inactive Publication Date: 2012-03-14
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the invention overcomes the deficiencies of existing water jet cleaning and chemical solution jet cleaning

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0011] The glass electrode is Mettler's 4560 type, which is cleaned by spray cleaning method, spraying once every 10 minutes. The cleaning solution is the water in the ditch, adding 0.07% polyacrylamide homopolymer and 2% Span80 as the cleaning solution. After 10 days of continuous measurement of water-based polymer drilling fluids, the pH readings were still accurate and reliable.

example 2

[0013] The glass electrode is Mettler's 4560 type, which is cleaned by spray cleaning method, spraying once every 60 minutes. The cleaning solution is water from the large circulation pool on the drilling site, and 0.1% polyacrylamide homopolymer and 5% Tween80 are added to make the electrode cleaning solution. After 10 days of continuous measurement of water-based polymer drilling fluids, the pH readings were still accurate and reliable.

example 3

[0015] The glass electrode is Mettler's 4560 type, which is cleaned by spray cleaning method, spraying once every 60 minutes. The cleaning liquid adopts the water from the large circulation pool on the drilling site, adds 0.05% of partially hydrolyzed polyacrylamide high polymer, and adds 3% of OP4 to prepare the electrode cleaning liquid. After 10 days of continuous measurement of water-based polymer drilling fluids, the pH readings were still accurate and reliable.

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PUM

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Abstract

The invention discloses a method for cleaning a glass electrode used for on-line measurement of pH value of drilling fluid, aiming at solving the problem of inaccurate measuring result due to easy pollution even scaling of sensitive portions of the electrode when on-line glass electrode is used for measuring the pH value of the drilling fluid in petroleum drilling. The method adopts polyacrylamide and a dilute solution of surfactant as the cleaning fluid, and uses a method of spray cleaning, thus the glass electrode can be cleaned effectively, and the accurate and long-term on-line measurement of the pH value of the drilling fluid is guaranteed. According to the method, the service life of the glass electrode can satisfy the requirement of on-line measurement. The addition of polyacrylamide is 0.01-0.1 %, and the addition of the surfactant is 1-5 %. Polyacrylamide can be homopolymer and also can be partially hydrolyzed polyacrylamide. The surfactant is nonionic.

Description

technical field [0001] The invention relates to a cleaning method for a glass electrode for online pH measurement, in particular to a cleaning method for a glass electrode for online pH measurement of drilling fluid. Background technique [0002] In oil and gas drilling, drilling fluid is necessary to carry cuttings, clean the wellbore, and lubricate the drill bit. The commonly used drilling fluid is water-based drilling fluid, which contains inorganic particles such as clay, cuttings, barite, etc., and may also contain oily components of crude oil. The pH value of water-based drilling fluid is a key parameter affecting the performance of drilling fluid, usually neutral to alkaline. [0003] The pH meter is an important analytical instrument in production, and it has been used for online measurement of drilling fluid in the oil drilling industry in recent years. The pH electrode is a very precise detection element. During use, it is often polluted or even scaled, resulting...

Claims

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Application Information

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IPC IPC(8): G01N27/38
Inventor 马云谦刘保双李公让何兴贵韩来聚
Owner CHINA PETROCHEMICAL CORP
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