Application of Rock Mechanics Parameters to Obtain Formation Pressure

2012 ◽  
Vol 239-240 ◽  
pp. 803-806
Author(s):  
Yong Tian ◽  
Hai Lin
Keyword(s):  
Rock Mechanics ◽  
Stress Testing ◽  
Pressure Profile ◽  
Triaxial Tests ◽  
Formation Pressure ◽  
Testing Instrument ◽  
Pressure Profiles ◽  
Formation Pore Pressure ◽  
The Relationship ◽  
Measured Pressure

Using triaxial tests of rock mechanics on stress testing instrument to analyze the results of its parameters, and obstained the the region that was consistent with the transformation between static and dynamic rock mechanics, the relationship between formation pore pressure and rock mechanical parameters, the pressure profile in the basis of rock mechanics parameters, etc. Combination of logging information and data, the method was identified which was in line with the use of rock mechanics parameters to strike a formation pressure. Using this method, I have analysised the formation pressure profiles of several wells in a block, and established the corresponding formation pressure detection section and the section of rock mechanics. The tested pressure and the measured pressure were compared more than 85% accuracy.

scholarly journals The Effect of Salt on Stability of Aqueous Foams

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 279
Author(s):  
Oyindamola Obisesan ◽  
Ramadan Ahmed ◽  
Mahmood Amani
Keyword(s):  
Salt Content ◽  
Pressure Sensors ◽  
Pressure Profile ◽  
Flow Loop ◽  
Clear Trend ◽  
Pressure Profiles ◽  
Aqueous Foams ◽  
The Impact ◽  
Measured Pressure ◽  
Foam Rheology

The properties of foams are often affected by environmental variables such as salt contamination. The objective of this study is to investigate the impact of salt on the drainage behavior of aqueous foams. To accomplish this objective, drainage experiments were conducted on aqueous foams. Test variables were foam quality (40–65%), and salt content (0% to 18%), and type. To investigate drainage, the foam was generated in a flow loop and trapped in a vertical test section. Then, the pressure profile in the foam column was measured using ten pressure sensors. Foam drainage is determined as a function of time using measured pressure profiles. The results show that the drainage of NaCl-containing foams decreased with foam quality, whereas the CaCl2-containing foams did not exhibit a clear trend with foam quality. The effect of salt content on foam rheology was minimal.

scholarly journals Propagation of radiosonde pressure sensor errors to ozonesonde measurements

2014 ◽  
Vol 7 (1) ◽  
pp. 65-79 ◽  
Author(s):  
R. M. Stauffer ◽  
G. A. Morris ◽  
A. M. Thompson ◽  
E. Joseph ◽  
G. J. R. Coetzee ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Atmospheric Pressure ◽  
Pressure Profile ◽  
Mixing Ratio ◽  
Concentration Cell ◽  
Pressure Profiles ◽  
Dependent Variables ◽  
Sensor Errors ◽  
Subsequent Addition ◽  
Total Column

Abstract. Several previous studies highlight pressure (or equivalently, pressure altitude) discrepancies between the radiosonde pressure sensor and that derived from a GPS flown with the radiosonde. The offsets vary during the ascent both in absolute and percent pressure differences. To investigate this problem further, a total of 731 radiosonde/ozonesonde launches from the Southern Hemisphere subtropics to northern mid-latitudes are considered, with launches between 2005 and 2013 from both longer term and campaign-based intensive stations. Five series of radiosondes from two manufacturers (International Met Systems: iMet, iMet-P, iMet-S, and Vaisala: RS80-15N and RS92-SGP) are analyzed to determine the magnitude of the pressure offset. Additionally, electrochemical concentration cell (ECC) ozonesondes from three manufacturers (Science Pump Corporation; SPC and ENSCI/Droplet Measurement Technologies; DMT) are analyzed to quantify the effects these offsets have on the calculation of ECC ozone (O3) mixing ratio profiles (O3MR) from the ozonesonde-measured partial pressure. Approximately half of all offsets are > ±0.6 hPa in the free troposphere, with nearly a third > ±1.0 hPa at 26 km, where the 1.0 hPa error represents ~ 5% of the total atmospheric pressure. Pressure offsets have negligible effects on O3MR below 20 km (96% of launches lie within ±5% O3MR error at 20 km). Ozone mixing ratio errors above 10 hPa (~ 30 km), can approach greater than ±10% (> 25% of launches that reach 30 km exceed this threshold). These errors cause disagreement between the integrated ozonesonde-only column O3 from the GPS and radiosonde pressure profile by an average of +6.5 DU. Comparisons of total column O3 between the GPS and radiosonde pressure profiles yield average differences of +1.1 DU when the O3 is integrated to burst with addition of the McPeters and Labow (2012) above-burst O3 column climatology. Total column differences are reduced to an average of −0.5 DU when the O3 profile is integrated to 10 hPa with subsequent addition of the O3 climatology above 10 hPa. The RS92 radiosondes are superior in performance compared to other radiosondes, with average 26 km errors of −0.12 hPa or +0.61% O3MR error. iMet-P radiosondes had average 26 km errors of −1.95 hPa or +8.75 % O3MR error. Based on our analysis, we suggest that ozonesondes always be coupled with a GPS-enabled radiosonde and that pressure-dependent variables, such as O3MR, be recalculated/reprocessed using the GPS-measured altitude, especially when 26 km pressure offsets exceed ±1.0 hPa/±5%.

Some Relationship between Safety Factor of Earthquake Slope and Related Parameters

2011 ◽  
Vol 422 ◽  
pp. 688-692
Author(s):  
Xiao Hei He ◽  
Geng You Han ◽  
Rui Hua Xiao
Keyword(s):  
Numerical Simulation ◽  
Rock Mechanics ◽  
Safety Factor ◽  
Limit Equilibrium ◽  
Static Method ◽  
Acceleration Coefficient ◽  
The Wenchuan Earthquake ◽  
Stability Of Slope ◽  
The Stability ◽  
The Relationship

Abstract:Since the Wenchuan earthquake happened, the slope stability had been paid much more attention. The safety factor is an important parameter that can be used to evaluate the stability of slope. The pseudo-static method that based on limit equilibrium and the method of numerical simulation can calculate the safety factor accurately, but the velocity that gets the result is slow. If we can establish the relationship between safety factor and some other parameters, then we can calculate the safety factor by using the relationship more quickly. This paper establishes much relationship, such as the relationship between the rock mechanics parameters and the average danymic safety factor, the relationship between the rock mechanics parameters and the ratio of average danymic safety factor to static safety factor, the relationship between the rock mechanics parameters and the average earthquake acceleration coefficient, the relationship between the average earthquake acceleration coefficient and the ratio of average danymic safety factor to static safety factor, and the relationship between the earthquake acceleration coefficient and the ratio of danymic safety factor to static safety factor on the condition of different rock mass.

scholarly journals Abnormal Pressure Distribution of Tertiary age formations in Middle & South Iraqi Oil Fields

2021 ◽  
Vol 7 (4) ◽  
pp. 46-63
Author(s):  
Dr. Faleh H. M. Almahdawi ◽  
Dr. Kareem A. Alwan ◽  
Ahmed K. H. Alhusseini
Keyword(s):  
Hydrostatic Pressure ◽  
Pressure Distribution ◽  
Oil Fields ◽  
Formation Pressure ◽  
Abnormal Pressure ◽  
Drilling Operations ◽  
South Of Iraq ◽  
Abnormal Formation Pressure ◽  
Formation Pore Pressure ◽  
Pore Pressure Gradient

Prediction of formation pore pressure gradient is a very important factor in designingdrilling well program and it help to avoid many problems during drilling operations such as lostcirculation, kick, blowout and other problems.In this study, abnormal formation pressure is classified into two types; abnormal highpressure (HP) and abnormal low pressure (LP), therefore any pressure that is either above orbelow the hydrostatic pressure is referred to as an abnormal formation pressure.This study concerns with abnormal formation pressure distribution and their effect ondrilling operations in middle & south Iraqi oil fields. Abnormal formation pressure maps aredrawn depending upon drilling evidence and problems.Three formations are considered as abnormal formations in the region of study, theseformations geologically existed in Tertiary age and they from shallower to deeper are: LowerFars, Dammam and Umm Er Radhuma, Formations. The maps of this study referred to eitherhigh formations pressure such as (Lower Fars and Umm Er Radhuma) or the low formationspressure such as (Dammam) in middle and south of Iraq. Finally these maps also suggested andshowed the area, where no field is drill until now, which may behave as high, low and normalformation pressure for every formation understudy.

scholarly journals Intra-Articular Pressure in Osteoarthritis of the Knee

2020 ◽  
Author(s):  
kai niu ◽  
le hai Pan
Keyword(s):  
Joint Space Narrowing ◽  
Normal Subjects ◽  
Joint Space ◽  
Positive Pressure ◽  
Osteoarthritis Of The Knee ◽  
Research Subjects ◽  
Pressure Profiles ◽  
Control Knee ◽  
Group 2 ◽  
The Relationship

Abstract Background: IAP （intra-articular pressure）of the knee has been extensively studied in the knee of rheumatoid arthritis1.3 . the relationship between IAP and osteoarthrosis of knee rarely mentioned in the literature. The purpose of the study was to discover the pressure profiles observed in OA(Osteoarthritis ）. The characteristics of osteoarthritis are multiple osteophytes, unstable chondral flaps ,joint-space narrowing，sclerosis. Whether these factors effect of osteoarthritis intra-articular pressure.Methods: Fifty three research subjects were studied. They were divided into two subgroups, group 1: Forty osteoarthritis (OA). group 2: Thirteen control knee of healthy volunteer. IAP was measured using the hand held portable water manometer. before operation of arthroscopic procedures in OAgroup . Research data were analyzed to identify IAP between the two groups. Results: The main findingwasthat Resting IAP was positive pressure in all Osteoarthritis joints, otherwise subatmospheric or weakly atmospheric in normal subjects. Conclusions: The IAP rising is a feature of all patients with OAgroup. Therefore, These observations we recognize that significantly increased resting IAP is major influences by multiple osteophytes, joint-space narrowing，sclerosis , loose bodies and definite deformity of bony ends.

scholarly journals Three-dimensional oblique water-entry problems at small deadrise angles

2012 ◽  
Vol 711 ◽  
pp. 259-280 ◽  
Author(s):  
M. R. Moore ◽  
S. D. Howison ◽  
J. R. Ockendon ◽  
J. M. Oliver
Keyword(s):  
Three Dimensional ◽  
Oblique Impact ◽  
Water Entry ◽  
Rigid Bodies ◽  
Normal Impact ◽  
Displacement Potential ◽  
Pressure Profiles ◽  
The Relationship ◽  
Wagner Theory ◽  
The Ideal

AbstractThis paper extends Wagner theory for the ideal, incompressible normal impact of rigid bodies that are nearly parallel to the surface of a liquid half-space. The impactors considered are three-dimensional and have an oblique impact velocity. A formulation in terms of the displacement potential is used to reveal the relationship between the oblique and corresponding normal impact solutions. In the case of axisymmetric impactors, several geometries are considered in which singularities develop in the boundary of the effective wetted region. We present the corresponding pressure profiles and models for the splash sheets.

Patterns and Reduced-order Reconstruction of Impinging Wiping Jet Pressure Profile Fluctuation Using Proper Orthogonal Decomposition

2021 ◽  
Author(s):  
Le Quang Phan ◽  
Andrew Johnstone ◽  
P. Buyung Kosasih ◽  
Wayne Renshaw
Keyword(s):  
Proper Orthogonal Decomposition ◽  
Jet Impingement ◽  
Pressure Profile ◽  
Orthogonal Decomposition ◽  
Maximum Pressure ◽  
Frequency Spectra ◽  
Reduced Order ◽  
Order Reconstruction ◽  
Pressure Profiles ◽  
Proper Orthogonal

Abstract Wiping jet impingement pressure is important in controlling the coating mass (thickness) and influencing the smoothness of the thin metallic coating produced in continuous galvanizing lines (CGLs). However, the fluctuation of the impingement pressure profile that directly impacts the coating smoothness has not been adequately understood. To study key features of the impingement pressure fluctuation, the instantaneous impingement pressure profiles obtained from Large Eddy Simulations were analyzed using Proper Orthogonal Decomposition (POD). Dominant fluctuation modes of pressure profiles can be differentiated from the energy contents of the modes corresponding to different jet types namely mixing, non-mixing, and transitional mixing jet. The dominant modes of mixing jets in the wiping region contain comparable strength of all modes (flapping, pulsing, and out-of-phase multi pulsing). Non-mixing jets do not show discernable fluctuation modes and transitional mixing jets show pulsing and flapping modes only. Additionally, instantaneous maximum pressure gradient and their location were determined from the reduced-order reconstruction of the pressure profiles. From the analysis, frequency spectra of the magnitude and location fluctuations of the maximum pressure gradients associated with each of the jet types can be clearly distinguished. This is a knowledge that may be helpful for CGL operators in the operation of wiping jets.

The Effects of Oil Supply Pressure at different Groove Position on Temperature and Pressure Profile in Journal Bearing

2013 ◽  
Vol 66 (3) ◽  
Author(s):  
Mohamad Ali Ahmad ◽  
Salmiah Kasolang ◽  
R. S. Dwyer-Joyce ◽  
Aidah Jumahat
Keyword(s):  
Journal Bearing ◽  
Pressure Profile ◽  
Diameter Ratio ◽  
Radial Load ◽  
Oil Supply ◽  
Supply Pressure ◽  
Pressure Profiles ◽  
Hydrodynamic Journal Bearing ◽  
Temperature And Pressure ◽  
Length To Diameter Ratio

The effects of oil supply pressure on the temperature and pressure at different groove locations on a hydrodynamic journal bearing were investigated. A journal with a diameter of 100 mm and a ½ length-to-diameter ratio was used. The supply pressure was set to 0.2, 0.5, and 0.7 MPa at seven different groove locations, namely, -45°, -30°, -15°, 0°, +15°, +30°, and +45°. Temperature and pressure profiles were measured at speed values of 300, 500, and 800 rpm with 10 kN radial load. The results show that the change in oil supply pressure simultaneously reduced the temperature and increased the pressure profile.

scholarly journals BLOOD PRESSURE PROFILES AMONG EAST BONGAS AND WEST BONGAS PEOPLE IN EFFORT AND SUPPORT FROM UNIVERSITAS PADJADJARAN AND THE REGENT OF MAJALENGKA REGENCY AND CHIEVES OF THE VILLAGES

2017 ◽  
Vol 9 (6) ◽  
pp. 215
Author(s):  
Diah Dhianawaty D. ◽  
Henhen Heryaman ◽  
Mas Rizky Anggun Adipurna Syamsunarno
Keyword(s):  
Blood Pressure ◽  
Age Groups ◽  
Simple Random Sampling ◽  
Pressure Profile ◽  
Joint National Committee ◽  
National Committee ◽  
Cross Sectional ◽  
Male And Female ◽  
The People ◽  
Pressure Profiles

Objective: To support the people in East Bongas and West Bongas villages to prevent and treatment the hypertension disease.Methods: This was a cross-sectional design while the subjects were taken by a simple random sampling. A total of 323 families were included, and blood pressure of the male and female subjects aged between 18 to 65 y was measured and had been given a question relating to their blood pressure.Results: The blood pressure profile was classified based on the seventh report of the Joint National Committee (JNC 7). The youngest male and female participants of pre-hypertension were 18 and 22 y, respectively. The normal blood pressure, pre-hypertension, hypertension stage-1, and hypertension stage-2 were 34.3%, 49.5%, 12.1%, and 4.1%, respectively. Prevalence of patients with hypertension based on the age groups 30-39, 40-49, 50-59, and 60-69 y were 6.8%, 15.6%, 33.9%, and 37.3%, respectively. Prevalence of patients with hypertension in male was 16.8%, the female was 15.7%, and the total of both were 16.2%. Prevalence based on gender showed that those who had information about hypertension in male was 46.8%, the female was 47.9%, and the total of both were 47.4%. Prevalence of hypertension patients increased, for a male was 8.9%, the female was 8.2%, and the total of both were 8.5% after the participants declared that they were not hypertension patients.Conclusion: In both villages occurred an increase of hypertension prevalence. Based on this information, the people in two villages should be given the appropriate knowledge and awareness regarding hypertension.

Sign in / Sign up

Export Citation Format

Share Document