Current Requirement for Cathodic Protection Of Oil Well Casing★

CORROSION ◽  
1957 ◽  
Vol 13 (11) ◽  
pp. 89-96 ◽  
Author(s):  
E. W. HAYCOCK
Keyword(s):  
Cathodic Protection ◽  
Laboratory Experiments ◽  
Scientific Basis ◽  
Oil Well ◽  
Complete Protection ◽  
Applied Current ◽  
Galvanic Cells ◽  
Current Requirement ◽  
Economic Balance ◽  
Current Potential

Abstract Methods at present used to indicate the minimum applied current required to give complete cathodic protection are discussed and evaluated in terms of their scientific basis and their applicability to the protection of oil well casing. Laboratory experiments are described involving the application of cathodic protection currents to a series assembly of galvanic cells. The results of these experiments lead to a modification of the log current—potential criterion of complete protection widely used at the present time. The experiments also indicate the amount of corrosion repressed as a function of the applied protection current, information which is of considerable value when an economic balance is involved. 5.2.4

Research of Dinosaurs Weathering Mechanism in Zhucheng Shandong

2015 ◽  
Vol 723 ◽  
pp. 757-762 ◽  
Author(s):  
Shang Kun Zhang ◽  
Sheng Xian Du ◽  
Xue Feng Yu ◽  
Guo Rong Zhang ◽  
Xiang Yu Luo ◽  
...  
Keyword(s):  
Water Temperature ◽  
Numerical Experiments ◽  
Laboratory Experiments ◽  
Reference Value ◽  
Scientific Basis ◽  
Geological Heritage ◽  
Physical Models ◽  
Process Water ◽  
Excavation Process ◽  
Weathering Process

In recent years, more and more domestic and international dinosaur fossils geological heritage were found, and many dinosaur fossils severe weathering within a few years after excavation.This study were based on Zhucheng dinosaur fossils ,the research of weathering mechanism of dinosaur fossils were from aspects of physical - mechanical characteristics.Means of laboratory experiments, physical models, theories and numerical experiments were used to explores the effect of weathering by the factors of excavation process, water, temperature , acidic substances and other factors on dinosaur fossils and relics.The results reveal the physical destruction of Shandong Zhucheng dinosaur fossils in the mechanism and characteristics of weathering process can provide theoretical and scientific basis for the protection of fossils, and other parts of the mechanism of weathering and protection of dinosaur fossils study provides reference value.

External Corrosion Control of Northern Pipelines

2008 ◽  
Author(s):  
S. Papavinasam ◽  
A. Doiron ◽  
T. Panneerselvam
Keyword(s):  
Cathodic Protection ◽  
Low Temperatures ◽  
Copper Sulphate ◽  
Laboratory Experiments ◽  
Field Experiments ◽  
Corrosion Control ◽  
External Corrosion ◽  
One Year

Based on one-year laboratory experiments in which samples were exposed to temperatures as low as −45°C and two-year data from field experiments, it is concluded that Canadian Standards Association (CSA) standards CSA Z662, CSA Z245.20 and CSA Z245.21 adequately address evaluation of coatings for northern pipelines. However, in order to evaluate the effects of low temperatures, specimens should be exposed for at least four months. Coatings qualified by CSA Z245.21 (System B1 and B2) are less affected by exposure to low temperatures than those qualified by CSA Z245.21 (System A1) and CSA Z245.20. Corrosion potentials measured at lower temperatures are in the range of potentials to use the cathodic protection (CP) potential criteria of −0.85 V vs. copper-copper sulphate for northern pipelines.

A comparison between the simulation and experimental results of cathodic protection of oil well casings

2019 ◽  
Vol 70 (9) ◽  
pp. 1708-1714 ◽  
Author(s):  
Ali H. Ghobadi ◽  
Saeed R. Allahkaram ◽  
Mohammad H. Parsa
Keyword(s):  
Cathodic Protection ◽  
Experimental Results ◽  
Oil Well

Cathodic Protection of Radiant Heating Pipes★

CORROSION ◽  
1958 ◽  
Vol 14 (7) ◽  
pp. 47-50 ◽  
Author(s):  
L. C. WASSON
Keyword(s):  
Cathodic Protection ◽  
Protection System ◽  
Cost Data ◽  
Radiant Heating ◽  
Complete Protection ◽  
Concrete Floor ◽  
Heating Pipes ◽  
Cathodic Protection System

Abstract In trying to apply cathodic protection to radiant heating pipes, it was not possible to provide protection from an external ground bed so distributed anodes were installed through a concrete floor. Because some 500 anode clusters were installed in a space 300 × 1200 feet some unusual techniques of application had to be developed to make the installation feasible. These techniques, along with the reasoning that led to their use are described. Also mentioned are some of the problems encountered in trying to determine if and when complete protection of the system was obtained. Cost data pertaining both to the installation and the operation of this cathodic protection system are reported. 5.2.3

Review of Sensitivity Studies for Impressed Current Cathodic Protection Systems

2011 ◽  
Author(s):  
Virginia G. DeGiorgi ◽  
Stephanie A. Wimmer
Keyword(s):  
Cathodic Protection ◽  
Scientific Basis ◽  
Naval Research ◽  
Critical Studies ◽  
Protection Systems ◽  
Sensitivity Studies ◽  
Impressed Current ◽  
The Individual ◽  
Future Work ◽  
Impressed Current Cathodic Protection

The Naval Research Laboratory has conducted investigations into the computational simulations of shipboard cathodic protection systems for several decades providing a scientific basis for the application of computational modeling to corrosion and signature systems. This work has expanded to other facilities and organizations, several of which are commercial in nature. However, much of the individual sensitivity studies which have led to an increased understanding of the behavior of cathodic protection systems have not had a high visibility. In this paper the authors review selected critical studies with notes towards future work. Because of their impact on modeling accuracy and means of defining components the authors have selected variations in electrolyte conductivity, damage modeling approaches, material characterization and paint characterization for review.

scholarly journals Study on the Influence of Pulse Current Cathodic Protection Parameters of Oil Well Casing

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Xiang-qian Xu ◽  
Hao-bin Zhou
Keyword(s):  
Cathodic Protection ◽  
Duty Cycle ◽  
High Frequency ◽  
Pulse Current ◽  
Oil Fields ◽  
Oil Well ◽  
Characteristic Structure ◽  
Protection Effect ◽  
Wave Pulse ◽  
Square Wave

Pulse current cathodic protection had obvious advantages over traditional DC cathodic protection, but when square-wave pulse current was used for cathodic protection of oil well casing, the influence of pulse protection parameters on potential distribution was not very clear. Therefore, according to the current situation of oil fields in China, the typical formation characteristic structure of oil wells was selected and the cathodic protection model of pulse current for oil well casing was established. Based on the established model, the effects of pulse current parameters (frequency and duty cycle) and anode distance on the cathodic protection effect of square-wave pulse current were studied. The results showed that better protection effect could be obtained by choosing appropriate anode distance, high frequency, and moderate duty cycle.

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