Application of a Hybrid Reverse Cementing Technique – Achieving Effective Zonal Isolation in a Severe Loss Circulation Zone

2020 ◽  
Author(s):  
Kamil Shahzad
Keyword(s):  
Circulation Zone ◽  
Cementing Technique ◽  
Severe Loss ◽  
Zonal Isolation

Innovative and Unconventional Approach to Cementing A Ballooning Well Leading to Good Zonal Isolation

2021 ◽  
Author(s):  
Lingges Devadass ◽  
Avinash Kishore Kumar ◽  
Chee Hen Lau ◽  
Myat Thuzar ◽  
Tiyor Sion Ban ◽  
...  
Keyword(s):  
Static Condition ◽  
Job Design ◽  
Back Pressure ◽  
Great Success ◽  
Cementing Technique ◽  
Cement Slurry ◽  
Fracture Pressure ◽  
Production Wells ◽  
Zonal Isolation ◽  
Actual Operation

Abstract Good cement bond log and sufficient zonal isolation are important aspects of production wells. Proper cement design and displacement are essential to ensure the cement objectives are met. Well A is one of four development wells, located in East Malaysia. The well was a gas producer, therefore good zonal isolation at the gas intervals are of paramount importance. Coupled with high inclination and formation with narrow pore pressure and fracture pressure margin, ballooning condition was encountered while drilling the reservoir section. These challenging conditions push the boundary of conventional cementing design further to implementation of unique and novel cementing approach to ensure no losses, minimal mud contamination with cement slurry and ultimately produce good zonal isolation. This unexpected conditions of the well lead to re-designing the cement slurry and revamping the placement procedure for the 7" liner across production zone. Operator’s limited experience with cementing in ballooning conditions hampered any reference which could be useful for the job design. Required formation permeability, porosity data, mud flowback volume and duration of mud flowback at static condition were carefully assessed and taken into consideration in the cementing job design and pumping program. Based on the data gathered, an unconventional cement placement technique with specialized spacer and slurry design were proposed Well A, instead of complex back-pressure application technique in order to meet all required cementing objectives. The cementing job was executed as per plan and no losses were observed during the entire cement job. Cement evaluation through cement bond logs indicated that enough isolations across the hydrocarbons zones of interest were obtained. Moreover, cement bond logs also showed good zonal isolation were also attained above and below perforation intervals showing very little contamination of mud backflow into the cement slurry. The cementing technique used proved to be relatively simpler and cheaper as it requires no additional equipment to rig up to execute compared to complex back-pressure technique which done incorrectly may lead to losses or remedial cementing. The successful cementing operation showcased that the planned cementing technique and slurry design were effective for the cementing of abnormal well conditions. This success also highlighted the importance of job pre-planning and necessity to acquire all required data prior to actual operation. The job technique and design was replicated in subsequent wells which had similar well ballooning condition and resulted in great success.

Application of Key Technique in Splitter Wellhead Cementing Enabled Successful and Safe Operations

2021 ◽  
Author(s):  
Chee Hen Lau ◽  
Avinash Kishore Kumar ◽  
Myat Thuzar
Keyword(s):  
Cost Savings ◽  
Pressure Profile ◽  
Construction Technology ◽  
Cementing Technique ◽  
Cement Slurry ◽  
Planning Phase ◽  
Well Design ◽  
Zonal Isolation ◽  
Unique Approach

Abstract This paper describes the application of key technique for splitter wellhead cementing of top-hole section in conductor-sharing wells in dozens of development wells in offshore Malaysia. Its objective is to elaborate on the challenges faced during the well planning phase, methodology of cementing technique, cementing slurry design as well as solutions outcome and lessons learnt. Limitations of current software in the industry to simulate the conductor-sharing well cementation and approaches to maneuver through these limitations are also discussed. During the well planning phase, cementing technique to address the risks associated with splitter wellhead cementing such as accidental cementation of dummy string, poor cement coverage in shared conductor, and losses uncertainties were analyzed. The cementing execution results of first batch of wells are examined, i.e. pressure profile, cement returns as well as opportunities for improvement were documented and translated into recommendations leading to eventual success for future well design. The cement slurry design for each casing in the splitter wellhead are also established based on its associated job objectives which is based on the unique approach in splitter wellhead cementing. The establishment of key cementing technique for such an unconventional well construction technology is important in order to ensure continuous success both in cement placement as well as cement slurry design. The best practices are currently being replicated by other major operators in Malaysia for all splitter wellhead cement design. The learnings from the technique are incorporated into the technical standard of Malaysia operator as well to serve as a specific mandated requirement for future operations. An integrated study of wellhead design, drilling practices and cementing technologies enabled a novel methodology to assure long term zonal isolation for the wells and innovation in the cementing approach enable cost savings for the operator as the wells can be drilled in a safe, efficient and cheaper way.

Long-Term Survival of a Flat-on-Flat Total Condylar Knee Arthroplasty Fixed with a Hybrid Cementing Technique for Tibial Components

2012 ◽  
Vol 22 (4) ◽  
pp. 305-312 ◽  
Author(s):  
Christian Carulli ◽  
Fabrizio Matassi ◽  
Lorenzo Nistri ◽  
Roberto Civinini ◽  
Massimo Innocenti
Keyword(s):  
Knee Arthroplasty ◽  
Cementing Technique ◽  
Term Survival ◽  
Long Term Survival

Retrieval of fractured Endodontic Instrument under dental operating microscope using ultrasonic tips : A Case Report

2020 ◽  
Vol 11 (3) ◽  
pp. 3316-3321
Author(s):  
Samrudhi Khatod ◽  
Anuja Ikhar ◽  
Pradnya Nikhade ◽  
Manoj chandak
Keyword(s):  
Case Report ◽  
Root Canal ◽  
Fracture Resistance ◽  
Root Canal Treatment ◽  
Operating Microscope ◽  
Severe Loss ◽  
Mechanical Procedure ◽  
Root Dentin ◽  
Fracture Level

A Patient came with the complaint of pain in the lower right back region of the jaw. Root canal treatment was planned. While preparing for the bio-mechanical procedure, the Hand pro taper fractured in the apical third. Iatrogenic occurred as a result of the fracture of the endodontic instrument. Retrieval of the fractured instrument was planned to complete the cleaning and shaping of the canal. The removal of the fractured instrument was planned to be done under the Dental Operating Microscope. The use of an operating microscope enhanced the illumination and the magnification of the instrument. This illumination and magnification helped in the precision of removal. The ultrasonic tip enabled to reach of the fractured instrument in the canal and loosen the dentin around the fractured instrument. It allowed easy retrieval of the fractured instrument. During the retrieval procedure, the fractured instrument was bypassed before the use of the ultrasonic tip. After the removal of the fractured instrument, cleaning and shaping were completed, followed by obturation, definitive restoration, and prosthesis. As the removal of the fractured instrument enabled complete cleaning and shaping, it improved the prognosis of the case. When the endodontic instrument gets fractured, it should be analyzed over the radiograph to assess the fracture level, the anatomy of the root canal, size of the fractured instrument, check accessibility, stage of fracture, etc. If all the above criteria are met with the removal of the instrument only then, replacement should be tried. Otherwise, it may lead to a severe loss of root dentin, decreasing fracture resistance of the root.

Severe Loss of Visceral Fat and Skeletal Muscle After Chemotherapy Predict Poor Prognosis in Metastatic Gastric Cancer Patients Without Gastrectomy

2019 ◽  
Author(s):  
Wanjing Feng ◽  
Mingzhu Huang ◽  
Xiaoying Zhao ◽  
Siyuan Chen ◽  
Chenchen Wang ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Skeletal Muscle ◽  
Cancer Patients ◽  
Visceral Fat ◽  
Poor Prognosis ◽  
Metastatic Gastric Cancer ◽  
Severe Loss ◽  
Gastric Cancer Patients

Application of Monoterpenoids and their Derivatives for Treatment of Neurodegenerative Disorders

2019 ◽  
Vol 25 (39) ◽  
pp. 5327-5346 ◽  
Author(s):  
Konstantin P. Volcho ◽  
Sergey S. Laev ◽  
Ghulam Md Ashraf ◽  
Gjumrakch Aliev ◽  
Nariman F. Salakhutdinov
Keyword(s):  
Alzheimer’S Disease ◽  
Clinical Trials ◽  
Huntington's Disease ◽  
Neurodegenerative Disorders ◽  
Heterogeneous Group ◽  
Neuroprotective Activity ◽  
Severe Loss ◽  
Neurotrophic Activity ◽  
Full Proof ◽  
Effective Treatments

Neurodegenerative disorders (NDDs) like Alzheimer's disease, Parkinson’s disease and Huntington’s disease are a heterogeneous group of disorders with the progressive and severe loss of neurons. There are no full proof cures for these diseases, and only medicines are available that can alleviate some of the symptoms. Developing effective treatments for the NDDs is a difficult but necessary task. Hence, the investigation of monoterpenoids which modulate targets applicable to many NDDs is highly relevant. Many monoterpenoids have demonstrated promising neuroprotective activity mediated by various systems. It can form the basis for elaboration of agents which will be useful both for the alleviation of symptoms of NDDs and for the treatment of diseases progression and also for prevention of neurodegeneration. The further developments including detections of monoterpenoids and their derivatives with high neuroprotective or neurotrophic activity as well as the results of qualified clinical trials are needed to draw solid conclusions regarding the efficacy of these agents.

Case Study: Zonal Isolation Challenges in the Midway-Sunset Field of the San Joaquin Valley

2015 ◽  
Author(s):  
Juan José Gomez Valadez ◽  
Larry Todd ◽  
Matthew Cleveland ◽  
Travis Clark ◽  
Matt Kruse
Keyword(s):  
San Joaquin Valley ◽  
Zonal Isolation
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