Successful Application of Single Stage Cementing with Fibered Cement Slurry in Low-Fracture-Pressure Production Formation – A Case History in Indonesia

2018 ◽  
Author(s):  
Moh Ariawan Hidayat
Keyword(s):  
Case History ◽  
Single Stage ◽  
Cement Slurry ◽  
Fracture Pressure

Successful Single-Stage Cementing in a Weak Formation: A Case History in Spain

2014 ◽  
Author(s):  
A.. Bottiglieri ◽  
A.. Brandl ◽  
R.S.. S. Martin ◽  
R.. Nieto Prieto
Keyword(s):  
Engineering Design ◽  
Case History ◽  
Laboratory Testing ◽  
Single Stage ◽  
Formation Damage ◽  
Cement Slurry ◽  
Integrity Test ◽  
Open Hole ◽  
Zonal Isolation ◽  
Horizontal Wellbore

Abstract Cementing in wellbores with low fracture gradients can be challenging due to the risk of formation breakdowns when exceeding maximum allowable equivalent circulation densities (ECDs). Consequences include severe losses and formation damage, and insufficient placement of the cement slurry that necessitates time-consuming and costly remedial cementing to ensure zonal isolation. In recent cementing operations in Spain, the formation integrity test (FIT) of the open hole section indicated that the formation would have been broken down and losses occurred based on calculated equivalent circulating densities (ECDs) if the cement slurry had been pumped in a single-stage to achieve the operator's top-of-cement goal. As a solution to this problem, cementing was performed in stages, using specialty tools. However, during these operations, the stage tool did not work properly, wasting rig time and resulting in unsuccessful cement placement. To overcome this issue, the operator decided to cement the section in a single stage, preceded by a novel aqueous spacer system that aids in strengthening weak formations and controlling circulation losses. Before the operation, laboratory testing was conducted to ensure the spacer system's performance in weak, porous formations and better understand its mechanism. This paper will outline the laboratory testing, modeling and engineering design that preceded this successful single stage cementing job in a horizontal wellbore, with a final ECD calculated to be 0.12 g/cm3 (1.00 lb/gal) higher than the FIT-estimated figure.

Using Thixotropic Cement Slurry for Lost Circulation Control: Case History, Volga-Urals Region

2019 ◽  
Author(s):  
Aleksey Fomenkov ◽  
Ilya Pinigin ◽  
Maxim Mikliayev ◽  
Artem Fedyanin
Keyword(s):  
Case History ◽  
Circulation Control ◽  
Control Case ◽  
Cement Slurry ◽  
Lost Circulation

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.

A Spectacular Cementing Record in Myanmar Offshore Deepwater Well

2021 ◽  
Author(s):  
Gang Sun ◽  
Mohammad Solim Ullah ◽  
Yi Li ◽  
Mukesh Maheshwari ◽  
Thirayu Khumtong ◽  
...  
Keyword(s):  
High Performance ◽  
Oil And Gas ◽  
Strength Development ◽  
Cement Slurry ◽  
Fracture Pressure ◽  
Sea Bed ◽  
Exploration And Production ◽  
Compressive Strength Development ◽  
Fit For Purpose ◽  
Logistic Support

Abstract Myanmar offshore is considered to be a very promising exploration and production (E&P) location for oil and gas but poses significant challenges to drilling and cementing operations. Low temperature at sea bed delays the cement compressive strength development, High pore pressure with steep gradient and low fracture pressure created a very narrow drilling margin, presence of shallow flow in riser-less section further complicated the cementing operation, low density cement with high performance is a must. With the exorbiant cost of Deepwater drilling, much needed fit for purpose cementing technology with efficient logistic support and excellence in execution became crucial. This paper elaborates the cementing challenges at different sections of a recent deep-water well in offshore Mynamar and techniques that were planned and used to address those challenges. This paper will describe in detail the cementing method, how it fit the well situation, how the cement slurry was designed then evaluated and how the logistic support and execution were carried out, resulting in a resounding success.

Weighted Spacer Design for Elevated Temperature Conditions to Mitigate Barite Settling by Identifying Suitable Viscosifier

2020 ◽  
Vol 846 ◽  
pp. 282-288
Author(s):  
Shantanu Savita Pandey ◽  
Rajnish Tripathi ◽  
Govindarajan Suresh Kumar
Keyword(s):  
Elevated Temperature ◽  
Discharge Rate ◽  
Vital Role ◽  
Drilling Mud ◽  
Displacement Efficiency ◽  
Cement Slurry ◽  
Rotational Viscometer ◽  
Fracture Pressure ◽  
Index Value ◽  
The Given

Any successful primary cementing operation at elevated temperature condition requires an efficient displacement of fluid surrounding the casing by cement slurry. In such conditions the cement slurry should be designed in such a way that it should be compatible with both cement and drilling mud. To achieve these requirements we designed the cement slurry with weighted spacer. Spacer is a barrier between cement & mud so that they should not mix with each other, also all these fluids should be incompatible inorder to avoid cement aggregation. The displacement efficiency during cementation is directly dependent on discharge rate, but however due to formation fracture pressure constraints, the discharge rate is limited, hence designing spacer becomes very crucial. This phenomenon becomes more pronounced at higher temperature as turbulent flow efficiency reduces due to the presence of weighting agent. The drive of the present work is to identify a suitable viscosifier to avoid settling of weighing agents in spacer and to maintain the stability of rheology admixture at elevated temperature condition. Laboratory tests were performed for compatible deformation and flow of matter with cement slurry-spacer-mud at temperature range (80-140°C) on a rotational viscometer as per the procedure of API RP 10B-2. The volumetric proportions of the cement slurry/spacer and spacer/mud admixtures were prepared with various ratios: 95/5, 75/25, 50/50, 25/75, and 5/95. Rheological compatibility of fluids (cement & spacer and mud & spacer) is evaluated by computing the R-Index Value (R) which is calculated by subtracting highest 100 rpm reading of admixture from highest rpm reading for an individual fluid for the given range of elevated temperature condition. The calculated R-Index Value can then be utilized to comment on fluid compatibility. After finalization of chemical compatibility, rheological hierarchy was achieved by incorporating the friction pressure loss with respect to discharge rate of an individual fluid for the given range of elevated temperature condition. The spacer system used achieved stable compatibility and efficient rheological hierarchy at elevated temperature cementing conditions. In addition, by comparing the results between the two different spacer systems, the role of hydration in attaining rheological compatibility is computed. This study will in turn prove helpful in figuring out the better spacer system which will play a vital role for better displacement and cementation quality.

Successful Single-Stage Cementing in a Weak Formation: A Case History in Spain

2014 ◽  
Author(s):  
A. Bottiglieri ◽  
A. Brandl ◽  
R.S. Martin ◽  
R. Nieto Prieto
Keyword(s):  
Case History ◽  
Single Stage

Foamed Conventional Lightweight Cement Slurry for Ultra-Low Density and Low ECDs Solves Loss-Circulation Problem Across Coal Formations: A Case History

2005 ◽  
Author(s):  
Tim W. Marriott ◽  
James Edward Griffith ◽  
Glen Fyten ◽  
Colin Mallett ◽  
Gregory Anthony Szutiak
Keyword(s):  
Case History ◽  
Low Density ◽  
Cement Slurry ◽  
Circulation Problem

Misophonia: An Evidence-Based Case Report

2020 ◽  
Vol 29 (4) ◽  
pp. 685-690
Author(s):  
C. S. Vanaja ◽  
Miriam Soni Abigail
Keyword(s):  
Quality Of Life ◽  
Case Report ◽  
Case History ◽  
Pure Tone ◽  
Physiological Responses ◽  
Evidence Based ◽  
Management Option ◽  
Pure Tone Audiogram

Purpose Misophonia is a sound tolerance disorder condition in certain sounds that trigger intense emotional or physiological responses. While some persons may experience misophonia, a few patients suffer from misophonia. However, there is a dearth of literature on audiological assessment and management of persons with misophonia. The purpose of this report is to discuss the assessment of misophonia and highlight the management option that helped a patient with misophonia. Method A case study of a 26-year-old woman with the complaint of decreased tolerance to specific sounds affecting quality of life is reported. Audiological assessment differentiated misophonia from hyperacusis. Management included retraining counseling as well as desensitization and habituation therapy based on the principles described by P. J. Jastreboff and Jastreboff (2014). A misophonia questionnaire was administered at regular intervals to monitor the effectiveness of therapy. Results A detailed case history and audiological evaluations including pure-tone audiogram and Johnson Hyperacusis Index revealed the presence of misophonia. The patient benefitted from intervention, and the scores of the misophonia questionnaire indicated a decrease in the severity of the problem. Conclusions It is important to differentially diagnose misophonia and hyperacusis in persons with sound tolerance disorders. Retraining counseling as well as desensitization and habituation therapy can help patients who suffer from misophonia.

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