Improved Method for Measuring Annular Water Flow in Injection Wells Using Continuous Oxygen Activation Logging

1993 ◽  
Author(s):  
D.E. Trcka ◽  
D.M. Chace
Keyword(s):  
Water Flow ◽  
Oxygen Activation ◽  
Improved Method ◽  
Injection Wells

scholarly journals WATERFLOODING FRONT MOVING TASK IN DUAL PERIODICAL AREA: PISTON-LIKE DISPLACEMENT CASE

2017 ◽  
Vol 20 (10) ◽  
pp. 116-129
Author(s):  
V.I. Astafiev ◽  
A.E. Kasatkin
Keyword(s):  
Water Flow ◽  
Physical Characteristics ◽  
Injection Wells ◽  
High Significance ◽  
Flow Features ◽  
Oil Water ◽  
Physically Identical

Water-oil contact moving task has a high significance in a waterflooding the- ory: it’s possible to improve oil recovering characteristics due to prediction of flow features for both liquids - oil and water displaced it. There is the simplest mathematical pattern for conjoint oil-water flow presenting: it is called ”versi- color” liquids model and it suggests making oil and water physically identical to simplify solving process for water-oil contact moving task. However, another pattern was used in research described in this paper: it is called pistonlike dis- placement model and it supposes that oil and water physical characteristics, for example, viscosities, may be different. As for the oil-keeping reservoir pattern used in this research it was presented as homogeneous and infinity, with fixed thickness: furthermore its surface was covered by dual periodical lattice included production and injection wells in its cells.

Multiple DNA-tracer transport approach for determining aquifer matrix properties in a laboratory 3D aquifer sand tank: a methodical perspective

2021 ◽  
Author(s):  
Swagatam Chakraborty ◽  
Chamath Arachchilage ◽  
Rayan Hamza Mohamed Elhaj ◽  
Jan Willem Foppen ◽  
Thom Bogaard ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
Travel Time ◽  
Water Flow ◽  
Quantitative Polymerase Chain Reaction ◽  
Three Dimensional ◽  
Breakthrough Curves ◽  
Effective Porosity ◽  
Potential Candidate ◽  
Tracer Transport ◽  
Injection Wells

<p>Use of environmental or artificial tracers has been an effective approach to characterize groundwater flow and solute transport, tracking pollutant migration and determine travel time. However, availability of a distinctive number of tracers, variability in interaction with the aquifer matrix, and analytical detection limits are namely few of the significant concerns to be addressed and which led us to focus on employing novel DNA tracers.</p><p>Besides the quality of being unique, improbably prevalent in nature and environmentally friendly, DNA tracers can be synthesized virtually in infinite numbers of distinct sequences, rendering them a potential candidate for multi-tracer applications for subsurface and groundwater flow characterization. Studies have already demonstrated the potential of DNA tracing in groundwater studies but a blueprint for methodical application and analysis is required.</p><p>In this study, we investigate the applicability of DNA tracers in determining hydraulic parameters of a natural aquifer, such as, hydraulic conductivity, effective porosity, dispersivity, and travel time, the most significant characters of a matrix, influencing solute or pollutant transport. In addition, we aim to leverage the applicability of the tracers in terms of minimizing the uncertainty in estimating the parameters.</p><p>In order to capitalize on these advantages of DNA tracers with the aim of addressing the aforementioned objectives, this research focuses on employing multiple dsDNA (ds=double stranded) tracers in a 1.3 m long three-dimensional sand-filled aquifer tank. Under forced-gradient water flow conditions, distinctly sequenced, monodispersed dsDNA tracers are instantaneously injected through injection wells, taking into account different scenarios. The scenarios consider different configurations of injection and sampling strategies. Samples collected periodically were subjected to quantitative polymerase chain reaction (qPCR) for DNA concentration estimation. All the silica-encapsulated DNA particles were comparable in size and surface properties.</p><p>Individual breakthrough curves from each of the scenarios are carefully analysed for determining water flow and hydraulic properties. In addition, the experiments producing multiple breakthrough curves are cumulatively analysed for obtaining a minimal uncertainty for the parameter estimations.</p>

Improved Oxygen-Activation Method for Determining Water Flow Behind Casing

1991 ◽  
Vol 6 (03) ◽  
pp. 334-342 ◽  
Author(s):  
D.C. McKeon ◽  
H.D. Scott ◽  
J-R. Olesen ◽  
G.L. Patton ◽  
R.J. Mitchell
Keyword(s):  
Water Flow ◽  
Oxygen Activation ◽  
Activation Method

The Disposal of Tailed Peak in the Time Spectrum of Pulsed Neutron Oxygen Activation Logging

2013 ◽  
Vol 318 ◽  
pp. 567-571
Author(s):  
Wu Dong ◽  
Hai Min Guo ◽  
Xin Qi
Keyword(s):  
Flow Velocity ◽  
Water Flow ◽  
Transit Time ◽  
Gaussian Function ◽  
Oxygen Activation ◽  
Time Spectrum ◽  
Flow Time ◽  
Redundant Data ◽  
Time Flow ◽  
Pulsed Neutron

In the time spectrum of impulse oxygen activation logging, grave tailed peak occurs when the viscosity of polymer is high and the velocity of the flow is not even. The calculation of transit time, flow velocity as well as flow volume depends on the duration of the oxygen activation peak, so the disposal of the grave tailed peak in the time spectrum of impulse oxygen activation logging is critical. And an effective way to deal with tailed peak will improve the calculation accuracy of transit time and flow velocity. In this paper, the problem of tailed peak is studied, then an algorithm combining Logarithmic transformation and Gaussian function, which is used to deal with tailed peaks in the time spectrum of water flow of pulsed neutron oxygen activation logging, is proposed. Gaussian function is used to describe tailed peaks in the time spectrum of water flow of pulsed neutron oxygen activation logging in the logarithm space. Case analysis shows that the disposal effect of the algorithm is good, effectively eliminating the redundant data of the tailed peak in the flow time spectrum of pulsed neutron oxygen activation logging. The algorithm is a practicable method to deal with the tailed peak in the flow time spectrum of pulsed neutron oxygen activation logging.

scholarly journals DETERMINATION OF WATER FLOW DIRECTIONS AT FORMATION FLOODING

2016 ◽  
pp. 50-52
Author(s):  
M. L. Karnaukhov ◽  
Caad A. Faik
Keyword(s):  
Water Flow ◽  
Field Data ◽  
Formation Pressure ◽  
Injection Wells ◽  
Water Flows ◽  
Oil Displacement ◽  
Water Breakthrough ◽  
Flow Directions

The articles considers the possibilities to study the directions of water flows in the reservoir during the oil displacement in the systems of formation pressure maintenance. It is proposed to perform simultaneously the studies in development and injection wells. Additionally, to study the field data permitting to establish the time of water breakthrough to the producers

The Analysis and Study on Separation of Overlapping Peaks in the Time Spectrum of Oxygen Activation Logging

2013 ◽  
Vol 318 ◽  
pp. 601-606
Author(s):  
Wu Dong
Keyword(s):  
Water Flow ◽  
Gaussian Function ◽  
Oxygen Activation ◽  
Time Spectrum ◽  
Flow Volume ◽  
Gray System Theory ◽  
Gray System ◽  
Overlapping Peaks ◽  
The Difference ◽  
Two Peaks

In the time spectrum of impulse oxygen activation logging, there will be two peaks which are overlapping when the difference of velocity in oil tubing and casing are very small. Transit time, an important parameter to calculate the velocity of water flow, depends on the foot time of a full peak. So does the computing of velocity and flow volume. Therefore, the separation of the overlapping peak in the time spectrum of impulse oxygen activation logging is the key. A good separation method will increase the precision of flow volume obtained. In this paper, the separation problem of overlapping peak is studied, and an algorithm combining Gaussian function and gray system theory that is used to separate the overlapping peaks in the time spectrum of water flow of pulsed neutron oxygen activation logging is proposed. According to error analysis and rationality test of the case studied, the algorithm shows a high separation precision and its effectiveness in the determination of flow volume, which proves to be a practicable method to separate overlapping peaks in the time spectrum of water flow of oxygen activation logging.

Sign in / Sign up

Export Citation Format

Share Document