An Anti-Collision Risk Assessment Method for Single-Row Wellheads in Vertical Well Section of Cluster Well

2011 ◽  
Vol 236-238 ◽  
pp. 8-13
Author(s):  
Yong Wang Liu ◽  
Zhi Chuan Guan ◽  
Guo Shan Zhao ◽  
Chang Peng Hu
Keyword(s):  
Assessment Method ◽  
Collision Probability ◽  
Construction Process ◽  
Well Bore ◽  
Collision Risk ◽  
Single Row ◽  
Vertical Well ◽  
Parallel Section ◽  
Risk Assessment Method ◽  
The Relationship

Vertical Well-bore Section Anti-collision is one of the main problems to be resolved for clustering directional well during the construction process. In order to effectively reduce the Vertical Well Section collision risk of this wells, the relationship between Wellbore cross-collision probability and the Wellbore separation was studied, the relationship between Wellbore cross-collision probability and the parallel Section length of the two Wellbore was also studied, Based on the above study found the method to calculate the Vertical Wellbore Section cross-collision probability of the clustering directional well. The Vertical Well-bore Section arrangement with smallest cross-collision probability was found by analyzing the cross-collision probability in line style wellhead of cluster wells consisting of 4 wells through this method. The results show that when the Well-bore separation is less than 1.5m. Wellbore collision probability rapidly decrease with the increase of Well-bore separation, the wellbore collision probability trends to smooth when wellbore separation is more than this distance, and the tendency will increase with the increase of parallel section length of the two Wellbore. By optimizing the arrangement and design methods can effectively reduce the collision risk. This study provides a new idea to reduce the overall risk of Cluster Well development.

Study on Construction Risk Assessment Method of Deep Buried Tunnels

2013 ◽  
Vol 405-408 ◽  
pp. 1305-1308
Author(s):  
Xing Kuang ◽  
Di Qing Yi ◽  
Cheng Liang Wang
Keyword(s):  
Risk Assessment ◽  
High Speed ◽  
Assessment Method ◽  
Risk Identification ◽  
Tunnel Construction ◽  
Construction Process ◽  
Railway Tunnel ◽  
High Speed Railway ◽  
Risk Assessment Method ◽  
Construction Risk

High speed railway tunnel have many uncertainty hazard factors in construction, at the stage of construction drawing design and during tunnel construction process. Taking no.1 tunnel in Xuefeng Mountain as a deep buried tunnel in the paper, tunnel construction risk source and main risk identification are analysis, main risk assessment during construction is recognized and reference for other similar projects is provided.

Geohazard Risk Assessment Method Based on Logistic Regression Model

2012 ◽  
Vol 588-589 ◽  
pp. 1934-1937
Author(s):  
Si Cheng ◽  
Yun Sheng Wang ◽  
Fei Yu Chen
Keyword(s):  
Logistic Regression ◽  
Regression Model ◽  
Logistic Regression Model ◽  
Assessment Method ◽  
Risk Assessment Method ◽  
Geological Factor ◽  
Independent Variable ◽  
Geohazard Risk ◽  
Relationship Of ◽  
The Relationship

Logistic regression model refers a regress analysis contains two types of variants. In geohazard analysis, each geological factor can be defined as independent variable, whether a geohazard happened or not can be defined as a dependent variable. 1 represents an occurrence of a hazard while 0 represents a hazard doesn’t break out. Because those factors aren’t continual variable, lineal regress is inadequate to deduce the relationship of such kind of independent and dependent variable. Therefore using logistic regress method is a feasible way to solve such technique problem.

A novel regional collision risk assessment method considering aggregation density under multi-ship encounter situations

2021 ◽  
pp. 1-19
Author(s):  
Rong Zhen ◽  
Ziqiang Shi ◽  
Zheping Shao ◽  
Jialun Liu
Keyword(s):  
Risk Assessment ◽  
Traffic Management ◽  
Assessment Method ◽  
Collision Risk ◽  
Temporal And Spatial Distribution ◽  
Maritime Traffic ◽  
Risk Assessment Method ◽  
Ship Collision ◽  
Sea Area ◽  
The Impact

Abstract The regional ship collision risk assessment for multiple ships in restricted waters is of great significance to the early warning of ship collision risk and the intelligent supervision of maritime traffic. Given the existed method of regional ship collision risk assessment without considering the impact of ship aggregation density, this paper proposes a novel regional ship collision risk assessment method that considers the aggregation density (AD) of the clusters of encounter ships (CES) for intelligent surveillance and navigation. The effectiveness of the proposed method has been examined by the experimental case study in the waters of Xiamen, China, and analysis has been compared with other existed studies to show the advantages of the new proposed algorithm. The results show that the study method can more intuitively and effectively quantify the temporal and spatial distribution of regional collision risks in the restricted sea area. The proposed method can improve the efficiency of traffic management when monitoring the ship collision risks in macroscopic view, and assist the safety of manned and unmanned ship navigation.

scholarly journals A Risk Assessment Method for Rockburst Based on Geodynamic Environment

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Zhijie Zhu ◽  
Hongwei Zhang ◽  
Jun Han ◽  
Youchang Lv
Keyword(s):  
Risk Assessment ◽  
Evaluation Method ◽  
Underground Mining ◽  
Active Faults ◽  
Dynamic Environment ◽  
Fuzzy Comprehensive Evaluation ◽  
Assessment Method ◽  
Mining Activities ◽  
Risk Assessment Method ◽  
The Relationship

Rockbursts are the sudden release of accumulated energy in surrounding rock of roadway and stope. Current studies on the rockburst mechanism are primarily focused on underground mining space and mining activities, whereas efforts have rarely been focused on regional geological dynamics. Mining activities in areas of energy accumulation under the influence of regional geological dynamics can easily cause mine dynamic disasters such as rockburst. The paper statistically analysed the relationship between geological dynamic environment factors (mining depth, tectonic stress, vertical crust movement, active faults, and the ratio of hard rock on the roof) and rockbursts in China and determined the relationship between various factors and the risk of rockbursts. Using a fuzzy comprehensive evaluation method and an analytic hierarchy process (AHP), a risk assessment method for rockburst based on the geological dynamic environment was established. This method was applied to assess the rockburst risk for the Tongxin coal mine in China, and it was evaluated as a weak rockburst risk. The result was consistent with the actual situation. The method provides a new concept for the evaluation and prediction of rockburst in new coal mines or new mining levels.

Storm surge risk assessment method for a coastal county in China: case study of Jinshan District, Shanghai

2020 ◽  
Vol 34 (5) ◽  
pp. 627-640 ◽  
Author(s):  
Shi Xianwu ◽  
Qiu Jufei ◽  
Chen Bingrui ◽  
Zhang Xiaojie ◽  
Guo Haoshuang ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Storm Surge ◽  
Assessment Method ◽  
Risk Assessment Method ◽  
Coastal County

scholarly journals A Methodology for Harmonizing Safety and Health Scales in Occupational Risk Assessment

2021 ◽  
Vol 18 (9) ◽  
pp. 4849
Author(s):  
Zuzhen Ji ◽  
Dirk Pons ◽  
John Pearse
Keyword(s):  
Risk Assessment ◽  
Health And Safety ◽  
Assessment Method ◽  
Assessment Process ◽  
Successful Implementation ◽  
Health Issues ◽  
Public Health Perspective ◽  
Chronic Health ◽  
Risk Assessment Method

Successful implementation of Health and Safety (H&S) systems requires an effective mechanism to assess risk. Existing methods focus primarily on measuring the safety aspect; the risk of an accident is determined based on the product of severity of consequence and likelihood of the incident arising. The health component, i.e., chronic harm, is more difficult to assess. Partially, this is due to both consequences and the likelihood of health issues, which may be indeterminate. There is a need to develop a quantitative risk measurement for H&S risk management and with better representation for chronic health issues. The present paper has approached this from a different direction, by adopting a public health perspective of quality of life. We have then changed the risk assessment process to accommodate this. This was then applied to a case study. The case study showed that merely including the chronic harm scales appeared to be sufficient to elicit a more detailed consideration of hazards for chronic harm. This suggests that people are not insensitive to chronic harm hazards, but benefit from having a framework in which to communicate them. A method has been devised to harmonize safety and harm risk assessments. The result was a comprehensive risk assessment method with consideration of safety accidents and chronic health issues. This has the potential to benefit industry by making chronic harm more visible and hence more preventable.

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