VIETNAM NATIONAL UNIVERSITY, HO CHIMINH CITY HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY ---oOo--- STUDENT’S NAME: LƯƠNG THỊ HỒNG SƠN APPLYING WELLLIFE SLURRY FOR CEMENTING HPHT WELLS AT Y FIELD, NAM CON SON BASIN SPECIALITY: PETROLEUM ENGINEERING (60520604) STUDENT ID: 7140880 MASTER THESIS HO CHI MINH CITY, 08/2018 Auxiliary pages We, the undersigned, recommend that the thesis is completed by student listed above, in partial fulfilment of the degree requirements, be accepted by the Ho Chi Minh City University of Technology for deposit. Professor/Advisor: Dr. ĐỖ QUANG KHÁNH Reviewer 1: Dr. NGUYỄN HỮU CHINH Reviewer 2: Dr.
HOÀNG QUỐC KHÁNH The Master Thesis is defended at the Committee of Master Thesis Examiners at Ho Chi Minh City University of Technology on 04th August 2018 The Committee members include: (Name of Advisor and Thesis committee members) 1. MAI CAO LÂN – Chairman of Committee 2. NGUYỄN HỮU NHÂN - Secretary 3. NGUYỄN HỮU CHINH – Member/Examiner 4.
HOÀNG QUỐC KHÁNH – Member/Examiner 5. TRƯƠNG HOÀI NAM - Member The Master thesis is evaluated and approved by Committee Chair. COMMITTEE CHAIR HEAD OF DEPARTMENT DEAN OF FACULTY VIETNAM NATIONAL UNIVERSITY, HO CHIMINH CITY HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY MASTER THESIS TASK Student’s name: LƯƠNG THỊ HỒNG SƠN STUDENT ID: 7140880 Date of birth: 24/12/1978 Place of birth: Rach Gia, KG SPECIALITY: PETROLEUM ENGINEERING I. THESIS’S NAME APPLYING WELLLIFE SLURRY FOR CEMENTING HPHT WELLS AT Y FIELD, NAM CON SON BASIN II.
TASK AND CONTENT - Overview about petroleum geology, temperature and pressure of Nam Con Son Basin. Information about cementing for HPHT wells in Nam Con Son Basin. Explore challenges and solution applied in HPHT wells. - Study Cement components in Conventional and HPHT environment.
- Study how WellLife Cement System works from collecting data to cement slurry design; Applying WellLife Slurry for cementing HPHT wells at Y field, Nam Con Son Basin. - Evaluate cement quality of WellLife cement in HPHT wells of Y field. THESIS DATE RECEIVED: 11/01/2018 IV. THESIS DATE COMPLETED: 25/06/2018 V.
Do Quang Khanh ADVISOR HEAD OF DEPARTMENT (Name and Signature) (Name and Signature) DEAN OF FACUTY (Name and Signature) [i] ABSTRACT This is a comprehensive study of applying WellLife slurry for cementing high temperature high pressure wells at Y field, Nam Con Son Basin. In this research, I explore basic information about petroleum geology, temperature and pressure at Nam Con Son Basin, information about cementing technology application history with failure or success, the effects of temperature and pressure to cement’s property. Then to study cement components for HPHT not only cement itself but scan through types of additives used in HPHT cementing slurries. Also research challenges and solutions of cementing HPHT wells, research WellLife components and WellLife cementing design for 5 ½ casing of a HPHT well in Y field which includes WellLife design for special cement G applied WellLife Slurry for cementing HPHT wells at Y field, study the process from well information, well schematic with all strings to Pore Pressure and Fracture Gradient windows to see the challenges and come up with solution applied for cement design for the last section, also the highest temperature and pressure section of the well.
Come up with components for blending. Get assistance from WellLife software and lab test to evaluate how WellLife slurry modify YM & PR & trend of modifying YM & PR with elastomer and recommended %bwoc. Finally, find out cement evaluation methodology and evaluate WellLife cement quality in a well via cement bond log result. The last conclusion and suggestion part, this thesis highlight what not yet been done and suggest development topic.
[ii] DEDICATION This is my own dedication. The data in the thesis is honest and experimental. [iii] ACKNOWLEDGMENTS This project would not have been possible without the support of many people. Many thanks to my advisers, Dr.
Nam for the invaluable assistance and insights leading to the writing of this paper as well as their patience and enduring this long process with me for the production of this paper. Thanks to my colleagues at Halliburton company for their assistance and dedication to support me to witness all the tests in lab on the requirement of the paper as well as real experience over learning curve of the project to come up with the best solution as well as to review and provide many examples used in this sample research paper have been quoted. And finally, thanks to my customer who supports me with the actual data to complete this project accurately. [iv] LIST OF FIGURES Figure 1.1: Y field at Nam Con Son Basin Figure 1.
Play types of Nam Con Son Basin [20] Figure 1. Matrix of High Pressure High Temperature Operation [1] Figure 1. Matrix of High Pressure High Temperature Operation [1] Figure 1. HPHT Tiers, Courtesy of Baker Hughes 2005 [1] Figure 1.
HPHT Tiers, Courtesy of Schlumberger, 2008 [1] Figure 1. HPHT Tiers, Courtesy of Halliburton, 2012 [1] Figure 1. Pressure profile at block 04, 05 Nam Con Son Basin [19] Figure 1. Pressure profile at block 04, 05 Nam Con Son Basin [19] Figure 1.
Temperature profile at block 04, 05 Nam Con Son Basin [19] Figure 3. Maintaining Overbalance pressure Figure 3. Gas channel forms under the following conditions Figure 3. Example of long-term gas migration problems Figure 3.
General trend for modification of Young’s modulus with elastomers Figure 3. General trend for modification of Poisson’s ratio with elastomers Figure 3. General trend for modification of Young’s modulus with elastomers Figure 3. General trend for modification of Poisson’s ratio with elastomers Figure 3.6: Model 6265 Mechanical Properties Analyzer Figure 3.7: Report of 6265 Mechanical Properties Analyzer Figure 3.8: Highly permeable sections require good fluid-loss Figure 3.
Uncontrolled fluid loss can result in a rapid cement Figure 3. Cement node buildup [v] Figure 3. Thermal thinning effect Figure 3.12: Well schematic contains 8 strings to reach to multiple reservoirs Figure 3.13: Pore Pressure – Fracture Gradient contains very narrow window 0. Temperature profile in Y field [18] Figure 3.
Conventional cement sheath with catastrophic failure Figure 3. WellLife cement resiliently withstands load Figure 3.17 Remaining capacity between conventional and WellLife cement Figure 3. UCA chart at BHST 160Deg C Figure 3. TT chart at Baseline 135Deg C – cement sample from Silo3 Figure 3.
SGS chart at BHST 160Deg C Figure 3. UCA chart at BHST 160Deg C Figure 3. TT chart at Baseline 160Deg C-Silo1 Figure 3. SGS chart-Silo#1 Figure 3.
UCA chart at BHST 185deg C-Silo1 Figure 3. UCA chart at TOL 155deg C - Silo1 Figure 3. TT chart at Baseline 160deg C-Silo 3 Figure 3. UCA at BHST-Silo3 Figure 3.
SGSA chart –silo#3 Figure 4. Relationship between Received Amplitude (E1) and Casing Size Figure 4. Correction Factor (Amplitude Ratio) for different wellbore fluids Figure 4. Cement Bond Log Interpretation Chart Figure 4.4: Acoustic Impedance of typical materials present behind pipe Figure 4.
SBT Pad arrangement and Attenuation rate computation methodology [vi] Figure 4. Baker Atlas SBT Interpretation Chart Figure 4. Examples of TT and Amplitude data Figure 4. Casing Collar Locator Radial CBL of 5-1/2 tubing of well Y after cementing with WellLife Slurry [vii] LIST OF TABLES Table 1.
Wells at Nam Con Son Basin with water depth of HPHT Table 1. Technical design and technology of cementing wells in block 04 & 05 Nam Con Son Basin Table 1. Cementing design from service providers for wells at Nam Con Son Basin Table 1. Slurry Design applied for HPHT wells in Nam Con Son Basin Table 2.
Water Requirements for Different Classes of Cement Table 2. Maximum allowable limits for Ions in mixing water Table 3. Comparison of Compressive Strength, Young’s Modulus and Poisson’s Ratio between WellLife 665 Additive and FDP-987-10 Material Table 3. Special WellLife Cement component [viii] LIST OF SYMBOLS AND ABBREVIATION API American Petroleum Institute CBL Cement Bond Log CSR-100L Cement Retarder CFR-3L Cement Friction Reducer Ex-HPHT Extreme High Pressure High Temperature gps gallon per sack HPHT High Pressure High Temperature h.minute m meter mD MiliDarcy MD Measured Depth MPRO Mechanical Properties Analyzer ppg Pounds per gallon SG Specific gravity SSA-1 Strength-Stabilizing Agent UCA Ultrasonic Cement Analyzer Ultra HPHT Ultra High Pressure High Temperature VDL Variable density log WOC Wait on cement BWOC By weight of cement YM Young’s Modulus PR Poisson’s ratio [ix] TABLE OF CONTENTS Pages ABSTRACT.
iii List of Figures. iv List of Tables. vii List of Symbols and Abbreviation. viii TABLE OF CONTENTS.
1 Target, tactics and objectives of the thesis:. 7 New contribution of Thesis. 8 Findings/Results/Data Analysis. OVERVIEW OF CEMENTING HPHT WELLS IN Y FIELD, NAM CON SON BASIN.1 Petroleum geology and temperature of Y field, Nam Con Son Basin .2 Information about cementing for HPHT wells in Nam Con Son Basin [19].
15 CHAPTER 2: CEMENT IN HIGH TEMPERATURE HIGH PRESSURE ENVIRONMENT.2 High Temperature Cements. 25 [x] CHAPTER 3: CHALLENGES AND SOLUTIONS OF CEMENTING HPHT WELLS, CEMENT SYSTEM DESIGN PROCESS AND APPLYING SAME WELLLIFE SLURRY FOR 10” LINNER AND 5-1/2 TUBING OF HPHT WELL IN Y FIELD.1 Challenges and Solutions of Cementing HPHT wells: .2 HPHT WellLife Cement System Design Process .1 Data to collect to design cement for HPHT wells: .2WellLife/Elastic cement slurry design .3Applying WellLife slurry for cementing HPHT wells at Y field .1 Well information and requirement of designing cement for 5-1/2 casing in HPHT well of Y field.2Solutions applied in cement design for 5-1/2 casing of well in Y field 66 3.3 10” Liner Cement Job Summary. 69 CHAPTER 4: EVALUATE CEMENT QUALITY IN 5-1/2 CASING OF HPHT WELLS IN Y FIELD NAM CON SON BASIN.1 Running and Interpreting Bond Logs with WellLife Cement .1 Cement Bond Logs .2 Ultra-Sonic Logs .3 Segmented Bond Tool. Evaluation result of WellLife cement quality for HPHT of well in Y field.
102 Page 1 of 115 PRELIMINARY Oil and gas is the leading industry in the national economy, it makes a great contribution to country GDP and accelerate industrialization and modernization. Producing oil requires a complex process from exploration, drilling, production in upstream and processing in downstream. During drilling operation, cementing plays an important role in securing well operation quality, especially the high temperature high pressure wells in Nam Con Son basin. The failures and non-productive time in cementing operation in this basin are varies such as unable to displace cement to annulus or cement harden in the casing or production liner or cement didn’t set in the annulus due to high temperature and/or high pressure in the wellbore change cement’s properties.
The above failures cause non-productive time and extra cost of operation, moreover it implies a gas kick, one of the serious problem of cement quality causes the well to be plugged and abandoned. One of the cause of those cement problem due to we don’t have fit cement slurry design, lack of suitable chemical fit to HPHT environment. In Vietnam, one of HPHT basin is Nam Con Son, this basin is 2nd largest oil and gas basin in Vietnam mainly gas and condensate. This basin has complicated geology, with sea water depth from 70m-more than 1000m from East to West.
In the past 40 years, there are about 100 drilling wells from exploration, appraisal to production well and the above failure used to happen in this basin. In upcoming years, there are some new development projects executed in this area or other high temperature area for gas production therefore the fact that an application, solution for HPHT cementing which successfully proven by the wells drilled in same basin at the same temperature and pressure as this field is a great experience and highly contribute to the success of upcoming HPHT projects. Therefore, in this thesis, I would like to understand challenges and solution of cementing in HPHT wells.