Determination of IMC-80BH Corrosion Inhibitor Concentration and Practical Application in Gas Field

2011 ◽  
Vol 284-286 ◽  
pp. 1049-1052 ◽  
Author(s):  
Zheng Fan ◽  
Wen Hong Li ◽  
Dong Li ◽  
Cun Ju Liu ◽  
Yu Luo ◽  
...  
Keyword(s):  
Corrosion Inhibitor ◽  
Inhibitor Concentration ◽  
Practical Application ◽  
Buffer Solution ◽  
Gas Field ◽  
Gas Well ◽  
Standard Curve ◽  
Oil Gas ◽  
Better Than

The ability of IMC-80BH corrosion inhibitor is proven to be excellent in earlier indoor static and flowing evaluation and it is worthwhile to determine the inhibitor concentration to maintain the optimum concentration for the sake of effective gas well protection. A improved concentration determination method is aboratively investigated. The maximum absorption wavelengths, buffer solution, reaction time and additive dosage of chromogenic reagent XD are detected successively and the standard curve of liquid phase behaves better than oil gas. The sample verification demonstrates that such determination measurement is reliable and precise. The four representative gas wells including G8-7, S59, W26-5 and G49-6 in service are also determined. The determination result offered substantial basis to analyze and select appropriate inhibitor injection program and dosage.

An Approach and Case Study on Determination of the Sulfur Deposition Radius in High Sulfur Gas Reservoir

2014 ◽  
Vol 1073-1076 ◽  
pp. 592-596
Author(s):  
Pei Luo ◽  
Yu Ming Luo ◽  
Kai Ma ◽  
Biao Zhang ◽  
Sha Sha Song
Keyword(s):  
Sulfur Deposition ◽  
Mixed Gas ◽  
Gas Reservoir ◽  
Gas Field ◽  
Gas Well ◽  
Pressure Transient ◽  
Field Development ◽  
Eastern Sichuan Basin

In the process of high sulfur gas field development, the sulfur will separate out from the mixed gas when the pressure near wellbore area drops to a critical pressure of H2S. This will reduce the reservoir porosity greatly and decrease the gas well productivity as well. This paper discusses the characteristics of pressure transient testing plots when sulfur deposition occurs based on the redial composite reservoir model. And introduce an approach to determine the sulfur deposition radius near the wellbore with pressure transient testing interpretation in high sulfur gas reservoir. The method has been applied in some high sulfur gas field in eastern Sichuan Basin. The result shows that the method is simple and practical.

scholarly journals Use of buffer methods to estimate the potential acidity of Mato Grosso soils

2020 ◽  
Vol 44 ◽  
Author(s):  
Marcelo Ribeiro Vilela Prado ◽  
Milton Ferreira de Moraes ◽  
Fabrício Tomaz Ramos ◽  
Carlos Leandro Rodrigues do Santos ◽  
David Vilas Boas de Campos ◽  
...  
Keyword(s):  
Standard Method ◽  
Soil Analysis ◽  
Crop Productivity ◽  
The State ◽  
Buffer Solution ◽  
Mato Grosso ◽  
Santa Maria ◽  
Potential Acidity ◽  
Better Than

ABSTRACT Mato Grosso, with a total area of 903357 km², does not have an official methodology for estimating soil potential acidity (H + Al), and determination of H + Al using the standard method is onerous and time consuming. The objective of this study was to compare estimated values of H + Al determined using the standard calcium acetate method with those obtained using three buffer methods, namely, the Shoemaker, McLean, and Pratt (SMP) buffer, Sikora buffer, and Santa Maria buffer (SMB) methods, with samples of the main classes of cultivated soils in the state of Mato Grosso. A total of 196 soil samples were collected from the arable layer (0-20 cm) in agropastoral and adjacent native systems. Statistical models were obtained and compared with models used by laboratories that are hypothetically inadequate because there is no calibration for soils in the state. After laboratory analyses, the paired H + Al and equilibrium pH values corresponding to the equilibrium of each buffer solution (SMP buffer, SMB, and Sikora buffer) were subjected to nonlinear regression analysis (P < 0.05). The SMB method, which does not release pollutant residues into the environment, was better than the Sikora and SMP methods for replacing the standard method used in state laboratories for soil analysis, that is, H + Al (cm3 c dm-3) = 51.189 -25.70 ln(pHSMB) (R2 = 0.88, P < 0.0001). Thus, if laboratories use uncalibrated equations to estimate soil potential acidity, the recommended limestone correction will be underestimated or overestimated, which may compromise crop productivity in Mato Grosso.

A Novel of L-Serine/Chitosan Electrochemical Sensor for Determination of Paracetamol

2014 ◽  
Vol 599-601 ◽  
pp. 776-781 ◽  
Author(s):  
Fu Neng Tan ◽  
Xue Hui Pang ◽  
Yun Bo Zhou
Keyword(s):  
Electrochemical Sensor ◽  
Electrochemical Impedance ◽  
Potassium Ferricyanide ◽  
Acetate Buffer Solution ◽  
Carbon Electrode ◽  
Practical Application ◽  
Modified Glassy Carbon Electrode ◽  
Buffer Solution ◽  
Solution Interface

A novel type of L-serine and chitosan modified glassy carbon electrode (L-Ser/CS-GCE) as a electrochemical sensor for determination of paracetamol was fabricated. With potassium ferricyanide as the probe, electrochemical properties of this sensor were characterized via electrochemical impedance spectroscopy(EIS) and measured EIS data were fitted with an equivalent circuit to investigate the detailed information about the electrode/solution interface. The electrochemical behavior of paracetamol on L-Ser/CS-GCE was studied via Cyclic voltammetry(CV). This electrochemical sensor showed an excellent electrocatalytic activity for the oxidation of paracetamol in pH4.9 acetate buffer solution and accelerated electron transfer between the electrode and paracetamol. Linear scan voltammetry (LSV) was used for determination of paracetamol. Peak current increased linearly with increasing paracetamol concentration in the range of 2.0×10-6～1.0×10 -3mol/L and the detection limit was found to be 8.3×10-7mol/L. The electrochemical sensor showed good stability and reproducibility. The practical application of the electrochemical sensor was successfully applied for determining the concentration of paracetamol in commercial acetaminophen tablets.

Discrimination and Simultaneous Determination of 6-BA and KT by Polarized Synchronous Light Scattering and Synchronous Light Scattering Spectrum

2013 ◽  
Vol 634-638 ◽  
pp. 81-86
Author(s):  
Xiao Hui Zhao ◽  
Qian Hua Zhu ◽  
Qiong Yang ◽  
Wei He ◽  
Shang Zhou ◽  
...  
Keyword(s):  
Light Scattering ◽  
Simultaneous Determination ◽  
Buffer Solution ◽  
Standard Curve ◽  
Scattering Spectrum ◽  
Curve Method ◽  
Standard Curve Method ◽  
Novel Method ◽  
Light Scattering Spectrum

In pH=5.70 B-R buffer solution, Na2WO4 and rhodamine 6G（R6G） could react with natural cytokinins of 6-benzylaminourine (6-BA) and kinetin (KT) and resulted in a great enhacement of synchronous light scattering (SLS) signals. This article first established the degree of polarized synchronous light scattering (P) based on the measurements of the polarized synchronous light scattering signals to distinguish two natural cytokinins of 6-BA and KT. Simultaneously based on the synchronous scattering spectrum and the double standard curve method, a novel method for simultaneous determination of 6-BA and KT was developed by SLS spectralmethod. The method was applied to simultaneous determination of 6-BA and KT in balsam pear skin and tomato skin with satisfactory results.

Psychrometric Determination of Water Activity in the High aw Range

1977 ◽  
Vol 40 (8) ◽  
pp. 537-539 ◽  
Author(s):  
B. A. PRIOR ◽  
C. CASALEGGIO ◽  
H. J. J. VAN VUUREN
Keyword(s):  
Sodium Chloride ◽  
Water Activity ◽  
Interpolation Method ◽  
Chloride Solutions ◽  
Standard Curve ◽  
Sodium Chloride Solutions ◽  
Sample Chamber ◽  
Better Than

A method is described to measure the water activity (aw) of foods in the range of 0.935 to 1.0 using a psychrometer. Samples (0.15 to 0.35 g) were equilibrated for 2 h in the sample chamber before cooling the thermocouple and recording the subsequent voltage on the instrument. The aw was read off a standard curve prepared from sodium chloride solutions of known water activity values. Results show that the method was considerably better than the graphical interpolation method and comparable to the microcrystalline method but was much quicker and required less effort.

Time and Latitude in South Africa

1972 ◽  
Vol 1 ◽  
pp. 27-38
Author(s):  
J. Hers
Keyword(s):  
South Africa ◽  
Cape Town ◽  
Astronomical Observations ◽  
Royal Observatory ◽  
The Republic ◽  
Astronomical Determination ◽  
Limited Accuracy ◽  
Better Than

In South Africa the modern outlook towards time may be said to have started in 1948. Both the two major observatories, The Royal Observatory in Cape Town and the Union Observatory (now known as the Republic Observatory) in Johannesburg had, of course, been involved in the astronomical determination of time almost from their inception, and the Johannesburg Observatory has been responsible for the official time of South Africa since 1908. However the pendulum clocks then in use could not be relied on to provide an accuracy better than about 1/10 second, which was of the same order as that of the astronomical observations. It is doubtful if much use was made of even this limited accuracy outside the two observatories, and although there may – occasionally have been a demand for more accurate time, it was certainly not voiced.

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