scholarly journals RESULTS OF APPLYING THE METHODOLOGY FOR THE QUANTITATIVE ASSESSMENT CONFIRM THE PREDICTION OF THE 3D MODELFOR HORIZONTAL SECTION OF WELLS

2017 ◽  
pp. 13-19
Author(s):  
R. M. Bembel ◽  
I. A. Schetinin
Keyword(s):  
Quantitative Assessment ◽  
3D Model ◽  
Forecast Model ◽  
Horizontal Section ◽  
Factors Affecting

The article discusses results of the use methodology for quantification of prediction of the 3D model for geosteering. This methodology tested for 90 wells with horizontal completion. According to the obtained statistics to assess factors affecting the reliability of the forecast model and defines the boundary criteria of quality confirmation.

Forecast Model of Phreatic Surface on Tailings Dam Based on GM-GRNN Theory

2010 ◽  
Vol 44-47 ◽  
pp. 3403-3407
Author(s):  
Fei Yue Wang ◽  
Zhi Sheng Xu ◽  
Long Jun Dong
Keyword(s):  
Prediction Method ◽  
Forecast Model ◽  
Random Disturbance ◽  
Tailings Dam ◽  
Phreatic Surface ◽  
Factors Affecting ◽  
Depth Analysis ◽  
Tailing Dam ◽  
Calculation Results ◽  
Surface Prediction

Due to the extremely complicated seepage boundary conditions of tailing dam, the calculation results adopting two-dimensional simplified theory may greatly different from the measured results. It is urgent need of an accurate calculation method to forecast phreatic surface. In-depth analysis of factors affecting tailings dam phreatic surface, phreatic surface prediction model based on GRNN and GM (1,1) was established. A tailing dam engineering is tested using this model. It shows that the model uses the advantages of "accumulative generation" of a Gray prediction method, which weakens the original sequence of random disturbance factors, and increases the regularity of data. It also makes full advantage of the GRNN approximation performance, which has a fast solving speed, describes the nonlinear relationship easily, and avoids the defects of Gray theory.

scholarly journals Overhead Transmission Lines Deicing under Different Incentive Displacement

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Qing He ◽  
Xi-feng Lv ◽  
Xiao-tong Zhao
Keyword(s):  
Transmission Lines ◽  
3D Model ◽  
Factors Affecting ◽  
Overhead Transmission Line ◽  
Temperature Environment ◽  
Safety And Reliability ◽  
Constraint Length ◽  
Main Factors ◽  
Ice Shedding ◽  
Excitation Conditions

Overhead transmission line icing is one of the main factors affecting safety and reliability of power grid. This paper proposed an excitation deicing method of iced wire and theoretically revealed the ice removal mechanism under displacement excitation conditions, by taking the LGJ-70/10 glaze icing wire as the 3D model and analyzing and studying its dynamic response under the effect of displacement excitation. The simulation results show that the stress of wire icing area is enlarged with the increase of excitation displacement and frequency. Through the comparison of the compression strength experimental results on a series of different iced wires in low temperature environment, the authors found out that the stress generated from the wire icing area is greater than the crushing strength of the ice within the scope of the calculation parameters, which proved the validity and the feasibility of the method, and finally the suitable excitation displacement is determined. Following studies show that, as far as possible, it is necessary to reduce the incentive displacement and also to select the appropriate constraint length in order to avoid the line jumping that may be caused by large span ice shedding.

Cementing Irregular Horizontal Wellbores

2021 ◽  
Author(s):  
Alondra Renteria ◽  
Parisa Sarmadi ◽  
Ian Frigaard
Keyword(s):  
3D Model ◽  
Secondary Flows ◽  
Positive Density ◽  
Drilling Mud ◽  
Horizontal Section ◽  
Two Fluids ◽  
Circular Annulus ◽  
Primary Cementing ◽  
Horizontal Wellbores ◽  
Averaged Model

Abstract In this work, we study the effect of borehole irregularities during primary cementing of a horizontal section of well. We use a simplified 2D gap-averaged model to compute the displacement of a drilling mud by a spacer within an elliptical annulus that represents an oval irregularity. We also present a series of 3D numerical simulations using a Volume of Fluid method to capture the interface between the fluids. The 3D model allows us to study the effects of more local irregularities such as wall roughness that can be imported from a caliper log. The dynamics of the displacement of two fluids in a horizontal uniform circular annulus is governed by buoyancy, eccentricity and the rheology of the fluids. A positive density difference combined with a slow mean pumping speed promotes slumping of the second fluid towards the bottom of the annulus. Nevertheless, high eccentricity values (e = 1-standoff) are common due to the weight of the casing pulling downwards, opposing the buoyancy force. Finally, the rheology of the fluids is relevant to determine the presence of un-displaced layers of mud, e.g. at the walls. The same competition described above holds true in the elliptical annulus. Results from the 2D gap-averaged model suggest that the elliptical shape incorporates an additional way of altering the velocity field around it. The effect is more evident when orienting the largest radius of the elliptical annulus at different angles. Results from 3D simulations show that the interface follows irregularities and the local roughness can improve the displacement by inducing secondary flows. However, enlargements result in poor displacement.

Factors affecting cosmetic outcome in breast-conserving cancer treatment — objective quantitative assessment

1991 ◽  
Vol 20 (2) ◽  
pp. 85-92 ◽  
Author(s):  
Richard D. Pezner ◽  
Mary P. Patterson ◽  
James A. Lipsett ◽  
Tamara Odom-Maryon ◽  
Nayana L. Vora ◽  
...  
Keyword(s):  
Cancer Treatment ◽  
Quantitative Assessment ◽  
Cosmetic Outcome ◽  
Factors Affecting ◽  
Treatment Objective

scholarly journals A Forecast Model of Agricultural and Livestock Products Price

2010 ◽  
Vol 20-23 ◽  
pp. 1109-1114 ◽  
Author(s):  
Wen Sheng Zhang ◽  
Hong Fu Chen ◽  
Ming Sheng Wang
Keyword(s):  
Consumer Price Index ◽  
Simulated Data ◽  
Warning System ◽  
Forecast Model ◽  
Future Price ◽  
Linear Regression Method ◽  
Price Fluctuation ◽  
Factors Affecting ◽  
The Government ◽  
Livestock Products

The frequent and excessive fluctuation of agricultural and livestock products price is not only harmful to residents’ living, but also affects CPI (Consumer Price Index) values, and even leads to social crisis, which influences social stability. Therefore it is important to forecast the price of agriculture and livestock products. As a result, we made a research on the factors affecting agricultural and livestock products price, established a forecasted model of agricultural and livestock products price, and developed its early-warning system which is suitable to China. Considering the direct relationship between the price and the output, multiple linear regression method was adopted to study this problem. The model is composed of three sub-models. This paper puts forward the concept of price equilibrium coefficient C0, which describes the degree to which people accepting the forecasted price. With the establishment of the standard for the influence of price fluctuation, the influence of price fluctuation is measured. Each range of the C0 value corresponds with a specific result, which may informs the government with the danger of price fluctuation. As a result, the model can early-warn the price rising caused by crop reduction due to sudden natural disaster, which may induce social turmoil and crisis. If the forecasted price rises heavily, the government should take measures to avoid crisis. This paper offers the method to control future price. Finally, a forecasted model of pork price is calculated with simulated data. The forecasted result is in good agreement with actual situation.

scholarly journals Factors affecting the formation of the steady state deceleration of two-wheel vehicles

2020 ◽  
Vol 17 (6) ◽  
pp. 186-194
Author(s):  
S. A. Evtyukov ◽  
◽  
I. S. Brylev ◽  
M. M. Blinder ◽  
◽  
...  
Keyword(s):  
Steady State ◽  
Quantitative Assessment ◽  
Regression Equations ◽  
Factors Affecting ◽  
Emergency Braking ◽  
Braking System ◽  
Factors Influencing ◽  
Wheeled Vehicle ◽  
System Type ◽  
Wheeled Vehicles

The article describes the factors influencing the formation of braking parameters for two-wheeled vehicles, in particular, bicycles, moving on dry asphalt and ground. There were carried out braking tests to determine the deceleration using the decelerometer of LWS-2MC type on dry asphalt and ground. Depending on the braking system type, the method of braking, the mass of the two-wheeled vehicle and the weight of the cyclist, as well as the suspension design, there were built graphs, and regression equations were obtained. A quantitative assessment of the factors influencing the formation of a steady-state deceleration of a two-wheeled vehicle during emergency braking is given.

High Frequency Pressure Monitoring of the Re-Fracturing or Continuous Pumping Operations: Case Studies

2022 ◽  
Author(s):  
Juan David Estrada ◽  
Roman Korkin ◽  
Sergey Parkhonyuk
Keyword(s):  
Hydraulic Fracturing ◽  
Oil And Gas ◽  
Successful Outcome ◽  
Minimal Risk ◽  
Key Factors ◽  
Efficient Technology ◽  
Horizontal Section ◽  
Factors Affecting ◽  
Production Increase ◽  
Significant Production

Abstract The opportunity to refracture low-producing horizontal wells, which have been fractured few months before is getting more and more popular in the last few years. It provides the opportunity of restoring production without drilling new wells, which might be economically feasible especially in the oil and gas low price environment. However, the success rate of refracturing operations is usually low, mainly driven by the inability to properly stimulate the entire horizontal section. Consequently, many operators do not widely deploy this efficient technology. In contrast, completing a newly drilled well with plug and perf technology allows to individually treat from forty to sixty or even more individual compartments in the lateral section while refracturing attempts to retreat the entire lateral in the absence of any isolating device while trying to cover the entire lateral. There are at least two key factors affecting this operation. First is diversion technology: without efficient chemical diverters, which allow to temporarily block recently treated intervals and divert the stimulation fluid to different open sections of the well is extremely challenging. These diverters should normally be able to hold pressure differentials up to thousand psi or more. Attempting a treatment without this technology, aka a "blind frac" is not an option in many cases. The second factor is monitoring technology: The ability to recognize whether a zone has been successfully stimulated, to decide on the deployment of diverting technology or the further addition of stimulation fluid, to sponsor lateral coverage with minimal risk of premature screen out becomes of utmost importance for the successful outcome of hydraulic refracturing operations. In the absence of either of the aforementioned factors hydraulic refracturing may become inefficient and yield uneconomic success. This paper presents how the application of novel diverters, combined with proper hydraulic fracturing fluid selection, sound engineering design and more importantly hydraulic fracturing monitoring provide a new opportunity for the deployment of hydraulic refracturing to provide significant production increase and enhance recovery factor.

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