scholarly journals Computer-Assisted in Coiled Tubing Perforation Limitations: A Case Study from MA-X Gas Well

2021 ◽  
Vol 2129 (1) ◽  
pp. 012013
Author(s):  
Kung Yee Han ◽  
Akhmal Sidek ◽  
Aizuddin Supee ◽  
Radzuan Junin ◽  
Zaidi Jaafar ◽  
...  
Keyword(s):  
Complex Analysis ◽  
Sea Water ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Computer Assisted ◽  
Outer Diameter ◽  
Gas Well ◽  
Coiled Tubing ◽  
Operational Variables

Abstract This paper seeks to determine the optimum operating conditions for deploying casing perforation guns based on CT to target depths in gas well MA-X by utilising Orpheus Model in CERBERUS. Orpheus assisted to solve the complicated scenarios and complex analysis involves mathematical modelling which is necessitates for computer processing powers. This study investigated four different Coiled Tubing (CT) intervention operational variables namely borehole assembly, CT grade outer diameter (OD), well fluid type and fractional reducer application included examined two scenarios which are running tools in (RIH) and pulling out from borehole (POOH). Only CT workstring with outer diameter between 1-1/4 inch and 2-7/8 inch is considered due to the wellbore completion minimum restriction. Constrained by economic and logistical reasons, only fresh water, 2% KCl, 15% HCl, sea water and diesel will be considered for the well bore fluid. Fractional reducer effects was simulated and analysed. Based on simulation results, the CT outer diameter 1-3/4 inch workstring optimized operation, the CT grade is QT1000 increased mechanical properties. A suitable well fluid is sea water with application of friction reducer improve CT perforation performances to achieve maximum target depth.

scholarly journals Thermo-economic analysis and optimization of the steam absorption chiller network plant

2021 ◽  
pp. 58-58
Author(s):  
Farshad Panahizadeh ◽  
Mahdi Hamzehei ◽  
Mahmood Farzaneh-Gord ◽  
Villa Ochoa
Keyword(s):  
Economic Analysis ◽  
Working Condition ◽  
Search Algorithm ◽  
Deep Understanding ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Absorption Chiller ◽  
Absorption Chillers ◽  
Optimization Search

Absorption chillers are one of the most used equipment in industrial, commercial, and domestic applications. For the places where high cooling is required, they are utilized in a network to perform the cooling demand. The main objective of the current study was to find the optimum operating conditions of a network of steam absorption chillers according to energy and economic viewpoints. Firstly, energy and economic analysis and modeling of the absorption chiller network were carried out to have a deep understanding of the network and investigate the effects of operating conditions. Finally, the particle swarm optimization search algorithm was employed to find an optimum levelized total costs of the plant. The absorption chiller network plant of the Marun Petrochemical Complex in Iran was selected as a case study. To verify the simulation results, the outputs of energy modeling were compared with the measured values. The comparison with experimental results indicated that the developed model could predict the working condition of the absorption chiller network with high accuracy. The economic analysis results revealed that the levelized total costs of the plant is 1730 $/kW and the payback period is three years. The optimization findings indicated that working at optimal conditions reduces the levelized total costs of the plant by 8.5%, compared to the design condition.

Coiled Tubing Dewaxing Operations: Case Studies in Reduced Production Wells of Northeast India

2021 ◽  
Author(s):  
Ishaan Singh ◽  
Akash Ramesh Pathak ◽  
Juhi Kaushik ◽  
Bholanath Bandyopadhyay ◽  
Danny Aryo Wijoseno ◽  
...  
Keyword(s):  
Crude Oil ◽  
Northeast India ◽  
Outer Diameter ◽  
Fluid Temperature ◽  
Equipment Failure ◽  
Operational Parameters ◽  
Coiled Tubing ◽  
Asphaltene Deposition ◽  
Pumping Rates

Abstract Executing interventions in wells encrusted with wax is challenging because experience with global coiled tubing (CT) dewaxing operations is limited, and equipment failure and stuck pipe risks are high. With few jobs performed worldwide, CT dewaxing (hot oil circulation with CT) operations are largely unexplored. The deviated wells in a field in northeast India pose several challenges including completely seized wellbore due to paraffin/asphaltene deposition, previous failed well cleanout attempts, very slow and low bottomhole assembly (BHA) penetration, pumping corrosive and flammable low wax crude (LWC) through CT, high chances of CT getting stuck, and pumping heated 69°C LWC through the CT. This case study delivers insights about design, safety, and operational considerations for 1.5-in. CT dewaxing and nitrogen lift operations in a subhydrostatic well in the field. The objective of this CT dewaxing and nitrogen kickoff operation was to clear the well of paraffin/asphaltene/wax to 1600 m and activate it with nitrogen, and this paper describes solutions for cleaning out and nitrogen-lifting wells with declining production due to paraffin and asphaltene deposition. One well is described in this case study, but this approach can be used perform CT intervention in similar wells. For this case, simulations were sensitized to identify the best combination of pumping rates, CT speeds, and fluid temperature to remove deposits hindering BHA penetration. This study proposes prevention measures using appropriate grounding and procedures, which determine if the crude oil can be pumped through CT. By use of this methodology, 581 dewaxing runs have been performed in 78 wells. Extensive on-job experience and lessons learnt by performing this operation over the last 3 years bring excellent results and prevent misruns. In many cases, production has been restored from nil; several examples feature a fivefold improvement of productivity thanks to this intervention method. Optimized operational parameters such as CT speed, pumping rates, and the use of smaller outer diameter BHAs doubled operational efficiency during those operations. In addition, strict application of the recommendations prevented the occurrence of operational problems such as stuck CT, crude oil flashing, sand bridging, and equipment failure.

scholarly journals Removal of 4-Nitrophenol from Aqueous Solution by Using Polyphenylsulfone-Based Blend Membranes: Characterization and Performance

Membranes ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 171
Author(s):  
Ali Amer Yahya ◽  
Khalid T. Rashid ◽  
Maryam Y. Ghadhban ◽  
Noor Edin Mousa ◽  
Hasan Shaker Majdi ◽  
...  
Keyword(s):  
Pore Size ◽  
Cross Section ◽  
Feed Solution ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Operational Variables ◽  
Blend Membranes ◽  
Dope Solution ◽  
And Performance ◽  
The Impact

Among many contaminants in wastewater, organic phenol compounds presented a major concern to endanger the water resources safety. In the present study, blend nanofiltration (NF) membranes comprising polyphenylsulfone (PPSU) and polyethersulfone (PES) were prepared via the non-induced phase separation and their performance was examined against 4-Nitrophenol (4-NP). The PES ratio in the dope solution was varied from 6 to 9 wt.% to probe the impact of PES on the retention and permeation characteristics of the final membranes. A series of experimental tools were employed to estimate the characteristics of the membranes, including surface and cross-section, hydrophilicity, pore size and pore size distribution. Performance evaluation of the NF membranes was conducted considering two operational variables; pH and initial feed solution. About 99% removal of 4-NP along with 6.2 L/m2.h.bar was achieved at the optimum operating conditions as revealed by optimization and mathematical modelling.

EVALUATION ON THE APPLICATIONS OF SMALL SIZE COILED TUBING IN WELL SERVICES

2016 ◽  
Vol 78 (6-4) ◽  
Author(s):  
Jirawat Chewaroungroaj ◽  
Thanawit Ounsakul
Keyword(s):  
Operating Conditions ◽  
Gas Well ◽  
Pumping Rate ◽  
Gas Industry ◽  
Hydrocarbon Production ◽  
Coiled Tubing ◽  
Economic Justification ◽  
Liquid Load ◽  
Promising Practice ◽  
Rate Requirement

Today, one of the most important key for hydrocarbon production in the oil & gas industry is economic justification. In the later state of the well’s production, the aging wells may introduce many problems such as scale, sand and liquid load-up. These impede the hydrocarbon production, preventing all the reserve to be fully produced. In order to fight this impedance, the use of small size coiled tubing is a promising practice, although has its own limit. The objective of this paper is to evaluate the limit of well services applications of small size Coiled Tubing (1" and 1.25") in various oil & gas well scenarios. The evaluation utilizes the computer modeling which is used to determine the hydraulic and mechanic operating conditions. Our study found the viability of 1” CT in the low inclination well scenarios with the lower pumping rate requirement, while 1.25” CT can be used in all of well services applications and scenarios.

Pre- or post-denitrification at biological filter works? A case study

1994 ◽  
Vol 29 (10-11) ◽  
pp. 145-155 ◽  
Author(s):  
A. Dee ◽  
N. James ◽  
I. Jones ◽  
J. Strickland ◽  
J. Upton ◽  
...  
Keyword(s):  
Cost Effective ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Sand Filters ◽  
Biological Filter ◽  
Fluidised Beds ◽  
The Cost ◽  
Economic Comparison ◽  
Low Rate

Pilot plant studies were conducted to evaluate the use of pre-denitrification for nitrogen removal at low-rate biological filter works. The plant was operated over a range of recycle ratios to determine the optimum operating conditions. It was possible to meet a total nitrogen limit of 15 mg TN/l with a 2:1 ratio of recycled filter effluent to settled sewage. Following the studies, an economic comparison was made to compare the costs of pre-denite plant with post-denitrification in tertiary sand filters. The cost-effectiveness of the pre-denite process depended on the price of the external carbon source used in post-denite plant. Biological fluidised beds were shown to be the most cost-effective type of pre-denite plant.

Coiled Tubing Velocity String Hang-Off Solves and Prevents Liquid-Loading Problems in Gas Well: Case Study in the Gulf of Guayaquil, Ecuador

2015 ◽  
Author(s):  
Juan Quintana ◽  
Eusebio Duque ◽  
Jose D. Diaz ◽  
Jose Eras ◽  
Jose Rodas ◽  
...  
Keyword(s):  
Liquid Loading ◽  
Gas Well ◽  
Coiled Tubing ◽  
Gulf Of Guayaquil

Teaching Computer Based Historical Data Analysis

1994 ◽  
Vol 6 (1) ◽  
pp. 52-58 ◽  
Author(s):  
Charles Anderson ◽  
Robert J. Morris
Keyword(s):  
Data Analysis ◽  
Social History ◽  
Historical Data ◽  
Good Practice ◽  
Computer Assisted ◽  
Historical Data Analysis ◽  
University Of Edinburgh ◽  
Computer Based ◽  
The University

A case study ofa third year course in the Department of Economic and Social History in the University of Edinburgh isusedto considerandhighlightaspects of good practice in the teaching of computer-assisted historical data analysis.

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