Papers by Dr. Ahmed H. Hilles
Day 1 Mon, October 31, 2022, Oct 31, 2022
This paper highlights the successful installation of a MultiLateral Technology (MLT) for the firs... more This paper highlights the successful installation of a MultiLateral Technology (MLT) for the first time in an offshore field 40 km from Abu Dhabi. It will document the deployment of the deepest cemented MLT Level 5 globally, with improvements in well design and operations sequence compared to the conventional design and execution plan. The system is demonstrated as a reliable method to access laterals giving the utmost importance to all operational risks concerning drilling and completion. The design relies on the Latch Coupling (LC) pre-installed with the production casing as the foundation for the successful drilling and cementing of the upper drain liner and for different completion runs. The downhole completion components that are permanently installed provide the capability for future reservoir monitoring and intervention to the laterals via coil tubing, wireline or slickline through the Multilateral Tieback System (MLTBS) completion. The well was completed as the deepest cemented Level 5 System globally with zero NPT on MLT completion operations. The planning phase was extremely meticulous and all risks were properly identified at planning stage and mitigated during execution. The significant developments to multilateral construction are: Optimize well profile, mud system, clean out and milling BHAs to facilitate the deployment of MTLB system. Improve the operations sequence by replacing the Retrievable Bridge Plug (RBP) run with intermediate completion. The assessed amendment has reduced four (4) trips during installation which has been recognized as a global system improvement for MLT Technology. Utilizing a glass device for the well barrier instead of slickline plugs have efficiently reduced the time and simplified the operation's intervention. Selecting to spot Hi-Vis after isolating the lateral instead of the sand has effectively improved the metal recovery and clean wellbore post clean up approach. The challenge of clean out post washover was moderated with fabricating a stinger to pass inside the packer and achieve proper debris cleaning to the seal bore area. The well achieved its objective by providing two integral laterals with mechanical and hydraulic isolation and full accessibility of both drains for better reservoir surveillance through one single well slot. MLT installation strategy was effectively optimized to reduce time, cost and installation's risk against the original plan. The design enhancements were beneficial to achieve multiple global records.
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Issue 4, 2016
The current study aimed to evaluate the performance of sodium persulfate to treat stabilized land... more The current study aimed to evaluate the performance of sodium persulfate to treat stabilized landfill leachate. Factorial design with response surface methodology (RSM) was used to evaluate the interaction between operational conditions, such as persulfate dosage, pH, and reaction time, to obtain the optimum conditions. The two quadratic models obtained by RSM for COD and NH3–N removal proved to be significant models (P<0.0001). The optimum conditions obtained included a reaction time of 60 min, 4.97g S2O82−, dosage and pH 7. The experimental results were corresponding well with predicted models (COD and NH3–N removal rates of 45%, and 47%, respectively. The results revealed that persulfate oxidation is an efficient for pretreatment of stabilized landfill leachate.
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Water Intelligence Online, 2015
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To reduce the amount of waste entering landfills, to mitigate the environmental problems and impa... more To reduce the amount of waste entering landfills, to mitigate the environmental problems and impacts due to solid waste generation and to protect the global goods and services, policymakers and governments have implemented a very large number of solid waste management (SWM) schemes and programs, particularly recycling and waste reduction programs such as source reduction, curbside recycling and drop-off recycling programs and a lot of other programs. The success of a solidwaste management program largely depends on household participation, this participation depend on the attitudes and behaviors of the society in a very large-scale. A better understanding of entire society behavior and attitudes of individuals will help decision makers to design and improve the effectiveness of solid waste management policies. This report studies the role of cultures and behaviors which control people attitudes regarding solid waste management processes, the report divided in a three major sections....
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Journal of Environmental Health Science and Engineering, 2014
Background The main objective of the study was the assessment of the prevalence and the identific... more Background The main objective of the study was the assessment of the prevalence and the identification of species of human gastrointestinal parasites as an indicator of the pollution of the seashore of Gaza City. Methods The investigation was conducted by analysis of the parasitic contamination of seawater along the study area. A total of 52 samples of seawater were analyzed during the summer period; from June to October 2011. The study area was divided into six zones (A, B, C, D, E and F) according to specific criteria such as the presence of the wastewater discharge points and other geographical characteristics. Results The results show that about 48% of the seawater samples from the shoreline region of Gaza City were contaminated with parasites. Zones A, B and D (mouth of Wadi Gaza, Al Sheikh Ejleen discharge and Al Shalehat discharge points respectively) have the highest level of parasitic contamination, while, zones C and E (From Al-Baydar restaurant to Khalel Alwazer Mosque an...
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Jordan Journal of Biological Sciences, 2013
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Journal of Environmental Science and Technology, 2011
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Sains Malaysiana, 2019
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Journal of Environmental Management, 2016
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Waste Management, 2015
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International Journal of Scientific Research in Environmental Sciences, 2014
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svu.edu.eg
... FOR ENVIRONMENTAL RESEARCHES Statistical analysis for physico-chemical characteristics in the... more ... FOR ENVIRONMENTAL RESEARCHES Statistical analysis for physico-chemical characteristics in the shoreline region of Gaza City Ahmed H. Hilles ... while S3 is the medium level of turbidity as it received a partially treated wastewater from inefficient Al-Shekh Iglean treatment ...
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Water Science and Technology, 2015
The objective of this study was to investigate the performance of employing H2O2 reagent in persu... more The objective of this study was to investigate the performance of employing H2O2 reagent in persulfate activation to treat stabilized landfill leachate. A central composite design (CCD) with response surface methodology (RSM) was applied to evaluate the relationships between operating variables, such as persulfate and H2O2 dosages, pH, and reaction time, to identify the optimum operating conditions. Quadratic models for the following two responses proved to be significant with very low probabilities (<0.0001): chemical oxygen demand (COD) and NH3-N removal. The obtained optimum conditions included a reaction time of 116 min, 4.97 g S2O82−, 7.29 g H2O2 dosage and pH 11. The experimental results were corresponding well with predicted models (COD and NH3-N removal rates of 81% and 83%, respectively). The results obtained in the stabilized leachate treatment were compared with those from other treatment processes, such as persulfate only and H2O2 only, to evaluate its effectiveness. ...
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National Institute for Environment and Development (NIED), 2021
Environmental Impact Assessment of 2021 War on the Gaza Strip – “Baseline Study”.
Reference: Dr.... more Environmental Impact Assessment of 2021 War on the Gaza Strip – “Baseline Study”.
Reference: Dr. Ahmed Hilles (Supervisor), Dr. Wesam Al-Madhoun (Team Leader) & Prof. Dr. Norman Ali Khalaf (Reviewer) (August 2021). Environmental Impact Assessment of 2021 War on the Gaza Strip – “Baseline Study”. National Institute for Environment and Development (NIED), Omar Al-Mukhtar Street, Al Samer Area, Gaza City, Palestine. In Cooperation with: Gaza University & Universiti Tun Hussein Onn Malaysia (UTHM). pps. 52.
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A combination of persulfate and hydrogen peroxide (S2O2
8 /H2O2) was used to oxidizelandfill lea... more A combination of persulfate and hydrogen peroxide (S2O2
8 /H2O2) was used to oxidizelandfill leachate.
The reaction was performed under varying S2O2
8 /H2O2 ratio (g/g), S2O2
8 /H2O2 dosages (g/g), pH, and
reaction time (minutes), so as to determine the optimum operational conditions. Results indicated that
under optimum operational conditions (i.e. 120 min of oxidation using a S2O2
8 /H2O2 ratio of 1 g/1.47 g at
a persulfate and hydrogen peroxide dosage of 5.88 g/50 ml and8.63 g/50 ml respectively, at pH 11)
removal of 81% COD and 83% NH3eN was achieved. In addition, the biodegradability (BOD5/COD ratio) of
the leachate was improved from 0.09 to 0.17. The results obtained from the combined use of
(S2O2
8 /H2O2) were compared with those obtained with sodium persulfate only, hydrogen peroxide only
and sodium persulfate followed by hydrogen peroxide. The combined method (S2O2
8 /H2O2) achieved
higher removal efficiencies for COD and NH3eN compared with the other methods using a single
oxidizing agent. Additionally, the study has proved that the combination of S2O2
8 /H2O2 is more efficient
than the sequential use of sodium persulfate followed by hydrogen peroxide in advanced oxidation
processes aiming at treatingstabilizedlandfill leachate.
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Papers by Dr. Ahmed H. Hilles
Reference: Dr. Ahmed Hilles (Supervisor), Dr. Wesam Al-Madhoun (Team Leader) & Prof. Dr. Norman Ali Khalaf (Reviewer) (August 2021). Environmental Impact Assessment of 2021 War on the Gaza Strip – “Baseline Study”. National Institute for Environment and Development (NIED), Omar Al-Mukhtar Street, Al Samer Area, Gaza City, Palestine. In Cooperation with: Gaza University & Universiti Tun Hussein Onn Malaysia (UTHM). pps. 52.
8 /H2O2) was used to oxidizelandfill leachate.
The reaction was performed under varying S2O2
8 /H2O2 ratio (g/g), S2O2
8 /H2O2 dosages (g/g), pH, and
reaction time (minutes), so as to determine the optimum operational conditions. Results indicated that
under optimum operational conditions (i.e. 120 min of oxidation using a S2O2
8 /H2O2 ratio of 1 g/1.47 g at
a persulfate and hydrogen peroxide dosage of 5.88 g/50 ml and8.63 g/50 ml respectively, at pH 11)
removal of 81% COD and 83% NH3eN was achieved. In addition, the biodegradability (BOD5/COD ratio) of
the leachate was improved from 0.09 to 0.17. The results obtained from the combined use of
(S2O2
8 /H2O2) were compared with those obtained with sodium persulfate only, hydrogen peroxide only
and sodium persulfate followed by hydrogen peroxide. The combined method (S2O2
8 /H2O2) achieved
higher removal efficiencies for COD and NH3eN compared with the other methods using a single
oxidizing agent. Additionally, the study has proved that the combination of S2O2
8 /H2O2 is more efficient
than the sequential use of sodium persulfate followed by hydrogen peroxide in advanced oxidation
processes aiming at treatingstabilizedlandfill leachate.
Reference: Dr. Ahmed Hilles (Supervisor), Dr. Wesam Al-Madhoun (Team Leader) & Prof. Dr. Norman Ali Khalaf (Reviewer) (August 2021). Environmental Impact Assessment of 2021 War on the Gaza Strip – “Baseline Study”. National Institute for Environment and Development (NIED), Omar Al-Mukhtar Street, Al Samer Area, Gaza City, Palestine. In Cooperation with: Gaza University & Universiti Tun Hussein Onn Malaysia (UTHM). pps. 52.
8 /H2O2) was used to oxidizelandfill leachate.
The reaction was performed under varying S2O2
8 /H2O2 ratio (g/g), S2O2
8 /H2O2 dosages (g/g), pH, and
reaction time (minutes), so as to determine the optimum operational conditions. Results indicated that
under optimum operational conditions (i.e. 120 min of oxidation using a S2O2
8 /H2O2 ratio of 1 g/1.47 g at
a persulfate and hydrogen peroxide dosage of 5.88 g/50 ml and8.63 g/50 ml respectively, at pH 11)
removal of 81% COD and 83% NH3eN was achieved. In addition, the biodegradability (BOD5/COD ratio) of
the leachate was improved from 0.09 to 0.17. The results obtained from the combined use of
(S2O2
8 /H2O2) were compared with those obtained with sodium persulfate only, hydrogen peroxide only
and sodium persulfate followed by hydrogen peroxide. The combined method (S2O2
8 /H2O2) achieved
higher removal efficiencies for COD and NH3eN compared with the other methods using a single
oxidizing agent. Additionally, the study has proved that the combination of S2O2
8 /H2O2 is more efficient
than the sequential use of sodium persulfate followed by hydrogen peroxide in advanced oxidation
processes aiming at treatingstabilizedlandfill leachate.