Mature Field Revitalization: Extending Late Life of Mature Gas Condensate Wells by Modelling Complex Multilateral Wellbore Flow Dynamics and Validating Results With a Field Pilot

2021 ◽  
Author(s):  
Harshil Saradva ◽  
Siddharth Jain ◽  
Christna Golaco ◽  
Armando Guillen ◽  
Kapil Kumar Thakur
Keyword(s):  
Late Life ◽  
Gas Condensate ◽  
Expected Improvement ◽  
Development Theory ◽  
Well Performance ◽  
Gas Wells ◽  
Liquid Loading ◽  
Wide Range ◽  
Wellbore Flow ◽  
The Impact

Abstract Sharjah National Oil Corporation (SNOC) operates 4 onshore fields the largest of which has been in production since the 1980's. The majority of wells in the biggest field have a complex network of multilaterals drilled using an underbalanced coiled tubing technique for production enhancement in early 2000s. The scope of this project was to maximize the productivity from these wells in the late life by modelling the dynamic flow behaviour in a simulator and putting that theory to the test by recompleting the wells. A comprehensive multilateral wellbore flow study was undertaken using dynamic multiphase flow simulator to predict the expected improvement in well deliverability of these mature wells, each having 4-6 laterals (Saradva et al. 2019). The well laterals have openhole fishbone completions with one parent lateral having subsequent numerous sub-laterals reaching further into the reservoir with each lateral between 500-2000ft drilled to maximize the intersection with fractures. Complexity in simulation further increased due to complex geology, compositional simulation, condensate banking and liquid loading with the reservoir pressure less than 10% of original. The theory that increasing wellbore diameter by removing the tubing reduces frictional pressure loss was put to test on 2 pilot wells in the 2020-21 workover campaign. The results obtained from the simulator and the actual production increment in the well aligned within 10% accuracy. A production gain of 20-30% was observed on both the wells and results are part of a dynamic simulation predicting well performance over their remaining life. Given the uncertainties in the current PVT, lateral contribution and the fluid production ratios, a broad range sensitivity was performed to ensure a wide range of applicability of the study. This instils confidence in the multiphase transient simulator for subsurface modelling and the workflow will now be used to expand the applicability to other well candidates on a field level. This will result in the opportunity to maximize the production and net revenues from these gas wells by reducing the impact of liquid loading. This paper discusses the detailed comparison of the actual well behaviour with the simulation outcomes which are counterproductive to the conventional gas well development theory of utilizing velocity strings to reduce liquid loading. Two key outcomes from the project are observed, the first is that liquid loading in multilaterals is successfully modelled in a dynamic multiphase transient simulator instead of a typical nodal analysis package, all validated from a field pilot. The second is the alternative to the conventional theory of using smaller tubing sizes to alleviate gas wells liquid loading, that high velocity achieved through wellhead compression would allow higher productivity than a velocity string in low pressure late life gas condensate wells.

scholarly journals Sexual Abuse Counsellors' Responses to Trauma and Stress: a Social Work Perspective

2021 ◽  
Author(s):  
◽  
Margaret Jane Pack
Keyword(s):  
Sexual Abuse ◽  
Social Work ◽  
Work Practice ◽  
Significant Others ◽  
The Body ◽  
Development Theory ◽  
Theoretical Frameworks ◽  
Theoretical Approaches ◽  
Wide Range ◽  
The Impact

<p>Using a qualitative research methodology, this study explores the range of social, organisational and theoretical factors that impact on sexual abuse counsellors. The relevance of the concept of vicarious traumatisation and the theoretical framework of constructivist self-development theory, as presented in the original study of McCann and Pearlman (1990) are investigated using a social work perspective. Secondly, the relationship between sexual abuse counsellors' responses to trauma and the theoretical frameworks identified as fruitful in their work with sexual abuse survivors are explored. Thirdly, the significant others of the primary participants were interviewed to elicit their perspectives of the impact of the work on their relationships with the counsellor-participants. This thesis adds to the body of knowledge about stress and trauma among sexual abuse therapists by introducing a multi-layered understanding of the challenges faced. It suggests that there are ways in which social workers and therapists can develop awareness and understanding of trauma and stress on multiple levels. It underlines the importance of workers sampling and integrating into their practice a wide range of theoretical approaches. These approaches which include narrative, strengths-based, critical-reflective, feminist and emancipatory frameworks provide a way for workers to connect with themselves, which is tansferred into fostering effective connections with clients, colleagues and their significant others. Maintaining relationship is the primary theme of this research which protects the counsellor from the fragmenting sense of disjuncture, that is a key experience of sexual abuse work Practice in a synthesis of theoretical frameworks provides a context for establishing and maintaining connections on a variety of levels: with the self and identity of the therapist, with others including clients, and with the wider social discourses in which their work is located.</p>

Optimizing Tubing and Liner Completion Design to Improve Gas Production from Existing Wells: Case Study for ADNOC Onshore Field Abu Dhabi, UAE

2021 ◽  
Author(s):  
Magdy Farouk Fathalla ◽  
Mariam Ahmed Al Hosani ◽  
Ihab Nabil Mohamed ◽  
Ahmed Mohamed Al Bairaq ◽  
Djamal Kherroubi ◽  
...  
Keyword(s):  
Gas Production ◽  
Base Case ◽  
Gas Wells ◽  
Production Rates ◽  
Liquid Loading ◽  
Gas Field ◽  
Well Production ◽  
Well Completion ◽  
The Impact

Abstract An onshore gas field contains several gas wells which have low–intermittent production rates. The poor production has been attributed to liquid loading issue in the wellbore. This study will investigate the impact of optimizing the tubing and liner completion design to improve the gas production rates from the wells. Numerous sensitivity runs are carried out with varying tubing and liner dimensions, to identity optimal downhole completions design. The study begins by identifying weak wells having severe gas production problems. Once the weak wells have been identified, wellbore schematics for those wells are studied. Simulation runs are performed with the current downhole completion design and this will be used as the base case. Several completion designs are considered to minimize the effect of liquid loading in the wells; these include reducing the tubing diameter but keeping the existing liner diameter the same, keeping the original tubing diameter the same but only reducing the liner diameter, extending the tubing to the Total Depth (TD) while keeping the original tubing diameter, and extending a reduced diameter tubing string to the TD. The primary cause of the liquid loading seems to be the reduced velocity of the incoming gas from the reservoir as it flows through the wellbore. A simulation study was performed using the various completion designs to optimize the well completion and achieve higher gas velocities in the weak wells. The results of the study showed significant improvement in gas production rates when the tubing diameter and liner diameter were reduced, providing further evidence that increased velocity of the incoming fluids due to restricted flow led to less liquid loading. The paper demonstrates the impact of downhole completion design on the productivity of the gas wells. The study shows that revisiting the existing completion designs and optimizing them using commercial simulators can lead to significant improvement in well production rates. It is also noted that restricting the flow near the sand face increases the velocity of the incoming fluid and reduces liquid loading in the wells.

A Transient Inflow Performance Relationship (IPR) for the Early and Late Life of Gas Wells: The Dynamic Gas IPR

2017 ◽  
Author(s):  
Pedro Cavalcanti de Sousa ◽  
Artur G. Posenato ◽  
Paulo J. Waltrich
Keyword(s):  
Late Life ◽  
Steady State Solution ◽  
Alternative Form ◽  
Transient Effects ◽  
Comparison Analysis ◽  
Gas Wells ◽  
Gas Reservoirs ◽  
Liquid Loading ◽  
Reservoir Models ◽  
Inflow Performance

This paper presents an alternative form of IPR, called in this study “Gas Dynamic IPR” (GDIPR), and compares it with the performance of conventional Inflow Performance Relationships (IPR) for gas reservoirs. The main objective of the GDIPR is to provide a simple but robust IPR solution for gas wells under transient conditions for the early and late life of gas reservoirs. Conventional IPR models are often not able to capture transient effects for the late life of gas reservoirs. The GDIPR solution, on the other hand, can be used for the cases of buildup and drawdown tests (early life), and for the modeling of transient liquid loading phenomena in gas wells (late life). The GDIPR is compared to conventional IPR models in two case studies. The comparison analysis show that the conventional IPR models do not provide reliable results, while the GDIPR is in agreement with the solution from discretized reservoir models. The GDIPR technique is computationally less expensive than discretized reservoir models, and is able to capture both the transient well behavior and the steady-state solution, for early and late life of gas reservoirs.

Prediction of Liquid Loading in Gas Condensate and Volatile Oil Wells for Unconventional Reservoirs

2020 ◽  
Author(s):  
Reem Alsadoun ◽  
Mohammad Al Momen ◽  
Hongtao Luo
Keyword(s):  
Production Efficiency ◽  
Oil And Gas ◽  
Theoretical Calculations ◽  
Volatile Oil ◽  
Gas Condensate ◽  
Economic Losses ◽  
Well Performance ◽  
Liquid Loading ◽  
Critical Rate ◽  
Correlation Models

Abstract All producing wells experience reservoir pressure depletion which will ultimately cause production to cease. However, the accumulation of wellbore liquid known as liquid loading can reduce production at a faster rate bringing forward the end of well life. In theory, there are many works written on liquid loading in unconventional wells however, these assumptions are challenged when implemented in the field. The aim of this paper is to investigate the relationship between empirical and mechanistic methods used to determine liquid loading critical rates for volatile oil and gas condensate wells, improving liquid loading forecast workflow for future wells. The study was carried on a wide Pressure, Volume, and Temperature (PVT) window with varying compositions ranging from gas condensate to volatile oils. Wells with liquid loading exhibit sharp drops and fluctuations in production. Due to the wide variation in composition however, correlations used must be varied whilst accounting for both composition and horizontal configuration of the well. Using Nodal Analysis methods, Inflow Performance Relationships (IPR) and Vertical Lift Profile (VLP) curves were created from different correlation models fitted for multiple wells selected for this study to optimize well performance. By combining theoretical analysis and field practices for estimating liquid loading critical rate, the appropriate workflow was determined for the volatile oil and gas condensate wells. When comparing the critical rate for liquid loading calculated from theoretical methods against actual rates seen in the field, an inconsistency was observed between the two values for several wells. By establishing a relationship between field estimate and theoretical calculations, liquid loading was forecasted with greater certainty for varying PVT windows. When the liquid loading rate is determined earlier on, the production efficiency can be improved by deploying unloading measures, increasing the well’s producing life, and ultimately alleviating economic losses. By investigating, we were able to establish a suitable process to predict liquid loading critical rates for volatile oil and gas condensate wells. This workflow can be utilized by production engineers to arrange for liquid loading mitigation increasing well life and improving well economics.

scholarly journals Sexual Abuse Counsellors' Responses to Trauma and Stress: a Social Work Perspective

2021 ◽  
Author(s):  
◽  
Margaret Jane Pack
Keyword(s):  
Sexual Abuse ◽  
Social Work ◽  
Work Practice ◽  
Significant Others ◽  
The Body ◽  
Development Theory ◽  
Theoretical Frameworks ◽  
Theoretical Approaches ◽  
Wide Range ◽  
The Impact

<p>Using a qualitative research methodology, this study explores the range of social, organisational and theoretical factors that impact on sexual abuse counsellors. The relevance of the concept of vicarious traumatisation and the theoretical framework of constructivist self-development theory, as presented in the original study of McCann and Pearlman (1990) are investigated using a social work perspective. Secondly, the relationship between sexual abuse counsellors' responses to trauma and the theoretical frameworks identified as fruitful in their work with sexual abuse survivors are explored. Thirdly, the significant others of the primary participants were interviewed to elicit their perspectives of the impact of the work on their relationships with the counsellor-participants. This thesis adds to the body of knowledge about stress and trauma among sexual abuse therapists by introducing a multi-layered understanding of the challenges faced. It suggests that there are ways in which social workers and therapists can develop awareness and understanding of trauma and stress on multiple levels. It underlines the importance of workers sampling and integrating into their practice a wide range of theoretical approaches. These approaches which include narrative, strengths-based, critical-reflective, feminist and emancipatory frameworks provide a way for workers to connect with themselves, which is tansferred into fostering effective connections with clients, colleagues and their significant others. Maintaining relationship is the primary theme of this research which protects the counsellor from the fragmenting sense of disjuncture, that is a key experience of sexual abuse work Practice in a synthesis of theoretical frameworks provides a context for establishing and maintaining connections on a variety of levels: with the self and identity of the therapist, with others including clients, and with the wider social discourses in which their work is located.</p>

Clinical and cognitive diversity of psychotic states arising in late life (late paraphrenia)

1995 ◽  
Vol 25 (4) ◽  
pp. 699-714 ◽  
Author(s):  
O. P. Almeida ◽  
R. J. Howard ◽  
R. Levy ◽  
A. S. David ◽  
R. G. Morris ◽  
...  
Keyword(s):  
Cognitive Impairment ◽  
Executive Functions ◽  
Cognitive Performance ◽  
Late Life ◽  
Psychotic Symptoms ◽  
Neurological Signs ◽  
Number Of Patients ◽  
Wide Range ◽  
The Impact ◽  
Cluster 2

SYNOPSISThis study aimed to explore the heterogeneity of paranoid psychosis with onset in late life by using cognitive factors in a centroid method of cluster analysis. Forty-seven subjects were allocated to two different clusters, the first with 24 (51·1 %) and the second with 23 (48·9 %) patients. Their cognitive attainment was evaluated against the performance of 33 elderly controls, all groups being matched for age, sex, and the numbers of years of education. Patients in cluster 2 showed a pattern of widespread cognitive impairment, which involved general measures of cognitive performance (MMSE, CAMCOG, WAIS-R verbal and performance scores), memory (digit and spatial span, delayed matching-to-sample, recognition memory for words and faces), and executive functions (verbal fluency, extra and intra-dimensional shift ability, spatial working memory, and planning). In contrast, patients in cluster 1 were only impaired on their extra-dimensional set shift and planning abilities, suggesting a more specific and restricted executive functioning deficit. We also analysed the impact that the use of antipsychotic medication could have had on patients' cognitive performance, which was shown to be negligible. In addition, there was no difference between the clusters with regard to the number of patients using neuroleptics, suggesting that the medication was unlikely to have introduced a performance bias in the two patient clusters. The validity of the subdivision of these patients into two separate groups was further supported by other clinical findings. Patients in cluster 1 exhibited more severe psychotic symptoms, as measured by the SAPS, than their counterparts in cluster 2, and were also more likely to display first-rank symptoms of Schneider. Conversely, cluster 2 membership was strongly associated with the presence of neurological signs and negative symptoms. We suggest that psychotic states arising in late life are a heterogeneous condition that may be best divided in two: ‘type A’, including patients with a wide range of psychotic symptoms, mild increase in the frequency of neurological signs, and cognitive deficits restricted to executive functions, and ‘type B’, which includes patients with less complex psychotic symptoms associated with a marked increase in the frequency of neurological signs and generalized cognitive impairment. The basis for this subdivision and the prospect for future studies are discussed.

Automated Intelligent Alarms to Monitoring and Identify Liquid Loading Challenge for Giant Depletion Gas Condensate Fields

2021 ◽  
Author(s):  
Ayesha Ahmed Abdulla Salem Alsaeedi ◽  
Manar Maher Mohamed Elabrashy ◽  
Mohamed Ali Alzeyoudi ◽  
Mohamed Mubarak Albadi ◽  
Sandeep Soni ◽  
...  
Keyword(s):  
Continuous Production ◽  
Rate Sensitivity ◽  
Gas Production ◽  
Production Optimization ◽  
Gas Condensate ◽  
Critical Parameters ◽  
Well Performance ◽  
Liquid Loading ◽  
Related Data

Abstract Depleted well monitoring is a crucial task to ensure continuous production without facing substantial issues that withhold the production, such as liquid loading. Utilizing an integrated digital production system and custom intelligence alarms functionality can help identify and analyze this bottleneck using physics-based model estimations that can help users take preventive actions, leading to saving cost, time, and effort. This paper demonstrates the identification of the liquid loading using custom intelligence alarms and an automated framework. Initially, a representative compositional well model is added to the digital twin solution enabling the automated well analysis workflow. Subsequently, custom intelligence alarms guidelines are configured to keep the well's performance and production rates under supervision with a notification capability when parameters violate the guidelines. Along with various well performance parameters being analyzed, two critical parameters for liquid loading debottlenecking, critical unloading velocity and the In-situ velocity, are investigated in the system for each well as the function of depth along well's completion. Moreover, advanced dashboards report the analysis output in an informative manner, guide users’ engineering judgment to take preventive decisions. As a result of the custom intelligence alarm, gas condensate wells suffering from liquid loading were predicted and identified. Based on the production parameter and target monitoring, these wells were unable to produce their expected mandate resulting in violating the set of production parameters guidelines. Identified wells were run through production gas rate sensitivity analysis using the analytical tool, and in conclusion, the optimal production rate was calculated. Producing the well below this critical rate causes the In-situ velocity to drop below critical unloading velocity. Additionally, using the tuned and calibrated network model, the operating choke was identified to maintain the stable flow in the well and avoid further liquid loading. This choke size was provided to field operation for implementation and saved the cost and man-hour spent during the flowing gradient surveys. The case study demonstrates significant production improvements observed for these wells, thereby significantly reducing cost and time. Using the integration of the latest production optimization platforms and custom intelligence alarm provides tools to identify wells that are currently experiencing liquid loading challenges and healthy wells that might come under the liquid loading category in the course of production, thus helping in taking proactive remedial action. Furthermore, the integrated framework provides erosional velocity-related data, which acts as a guideline while optimizing gas production.

Well Performance Improvement By Identifying And Preventing Liquid Loading Using An Integrated Asset Operation Model Framework For Gas Condensate Wells

2020 ◽  
Author(s):  
Ayesha Ahmed Abdulla Salem Alsaeedi ◽  
Fahed Ahmed AlHarethi ◽  
Manar Maher Mohamed Elabrashy ◽  
Shemaisa Ahmed Abdalla Mohamad Alsenaidi ◽  
Nagaraju Reddicharla ◽  
...  
Keyword(s):  
Performance Improvement ◽  
Gas Condensate ◽  
Well Performance ◽  
Operation Model ◽  
Liquid Loading ◽  
Model Framework

THE IMPACT OF LEADERSHIP PRACTICES TO TEAM MEMBERS’ SATISFACTION

2009 ◽  
Vol 8 (1) ◽  
Author(s):  
Chalimah .
Keyword(s):  
Conflict Resolution ◽  
Leadership Practices ◽  
Hotel Industry ◽  
Leader Behavior ◽  
Team Leader ◽  
Shop Floor ◽  
Team Members ◽  
Top Executives ◽  
Wide Range ◽  
The Impact

eamwork is becoming increasingly important to wide range of operations. It applies to all levels of the company. It is just as important for top executives as it is to middle management, supervisors and shop floor workers. Poor teamwork at any level or between levels can seriously damage organizational effectiveness. The focus of this paper was therefore to examine whether leadership practices consist of team leader behavior, conflict resolution style and openness in communication significantly influenced the team member’s satisfaction in hotel industry. Result indicates that team leader behavior and the conflict resolution style significantly influenced team member satisfaction. It was surprising that openness in communication did not affect significantly to the team members’ satisfaction.

Stress, anxiety, depression and burnout in frontline health care workers during COVID-19 pandemic: a brief systematic review and new data from Russia

2021 ◽  
Author(s):  
Ekaterina Mosolova ◽  
Dmitry Sosin ◽  
Sergey Mosolov
Keyword(s):  
Risk Factors ◽  
Systematic Review ◽  
Female Gender ◽  
Assessment Tools ◽  
Care Workers ◽  
Younger Age ◽  
Wide Range ◽  
Associated Risk Factors ◽  
Anxiety Depression ◽  
The Impact

During the COVID-19 pandemic, healthcare workers (HCWs) have been subject to increased workload while also exposed to many psychosocial stressors. In a systematic review we analyze the impact that the pandemic has had on HCWs mental state and associated risk factors. Most studies reported high levels of depression and anxiety among HCWs worldwide, however, due to a wide range of assessment tools, cut-off scores, and number of frontline participants in the studies, results were difficult to compare. Our study is based on two online surveys of 2195 HCWs from different regions of Russia during spring and autumn epidemic outbreaks revealed the rates of anxiety, stress, depression, emotional exhaustion and depersonalization and perceived stress as 32.3%, 31.1%, 45.5%, 74.2%, 37.7% ,67.8%, respectively. Moreover, 2.4% of HCWs reported suicidal thoughts. The most common risk factors include: female gender, nurse as an occupation, younger age, working for over 6 months, chronic diseases, smoking, high working demands, lack of personal protective equipment, low salary, lack of social support, isolation from families, the fear of relatives getting infected. These results demonstrate the need for urgent supportive programs for HCWs fighting COVID-19 that fall into higher risk factors groups.

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