AlMansoori has implemented Happiness as a key business theme during 2017 as one of the first companies in the private sector in the UAE. The journey of AlMansoori's Happiness implementation is described in this paper with the aim to share the learning to the fellow UAE companies to benefit from. Early results indicate that Happiness got widely embraced in the company with no resistance nor cynicism. The new culture whereby Happiness is an enabler that is on par with health, safety and quality clearly will set-up AlMansoori for a better future both business commercially and as a community of employees.
The objective of this paper is to understand and identify key risks which an aging drilling rig is exposed to over period of time. Also, how the changing standards and codes impose challenging operational conditions for the drilling operators.
Scope of paper: Drilling rigs which are more than 15 years old Elements of 12 industry discipline which are key in drilling operations Life Extension methodology for drilling rigs
Drilling rigs which are more than 15 years old
Elements of 12 industry discipline which are key in drilling operations
Life Extension methodology for drilling rigs
Maintenance Strategy Electrical Equipment Rotating Equipment Static Equipment Information Technology Infrastructure Health Safety and Environment Tele- Communications Infrastructure Instrument and Control Piping Pipelines Laboratory Process Safety
Information Technology Infrastructure
Health Safety and Environment
Tele- Communications Infrastructure
Instrument and Control
Al Khaldy, Ali (Kuwait Oil Company) | Hassan, Jassim (Kuwait Oil Company) | Durge, Ashutosh (Kuwait Oil Company) | Dashti, Reham (Kuwait Oil Company) | Carasco, Anant (Schlumberger) | Bandi, Mani (Schlumberger) | Al Najdi, Faisal (Schlumberger) | Fernandes, Daniel (Schlumberger) | Jokhi, Ayomarz (Schlumberger) | Helal, Karim (Schlumberger) | Hassan, Said (Schlumberger) | Nair, Prakash (Schlumberger)
Sidetracking a cased wellbore presents numerous challenges because the operators have to plan ahead to select the sidetracking depth and then ensure that all the objectives are met from a well authority for expenditure and geological target perspective. The quality of the geological target window is of great concern to operators because it ensures that the subsequent bottomhole assembly (BHA) will pass through the window without any problems. Sidetracking the wellbore when the milling assembly has to cut two strings of casing is an additional unique challenge. The centralizer and casing collar locator along the length of the wellbore at and in the region of the kickoff point are significant because they can be additional risks, which can lead to costly multiple trips to ensure that the window is in good-quality form. An operator was faced with potential geological losses at the kickoff point in a wellbore while attempting to sidetrack an existing wellbore containing 9.625-in., 43.5-lbm/ft L80 buttress thread casing, and 13.375-in., 68-lbm/ft K55 buttress thread casing, dual strings at the kickoff point.
The BHA for this challenging application was modeled using a finite-element analysis (FEA)-based modeling system to select the optimum BHA to sidetrack the wellbore with the least amount of vibrations. The feasibility of using a bi-mill vs. tri-mill BHA was evaluated. As a result, a parameter road map, taking into consideration the dimensions of the whipstock slide and mill position during the milling operations, was finalized. The placement of the centralizers and casing collars along the length of the casing at the kickoff point was considered. The exact locations where the lead mill would initiate the cut at each casing string were analyzed to determine the whipstock setting depths.
A corrosion and collar locator tool was used to identify the collar location along the 13.375-in. casing because standard casing collar locator logging tools were not be able to identify the location of the casing collars along the length of the 13.375-in. casing string.
Whipstock simulation software was used to check the bending moments and stresses for the pass-through BHA because the dogleg through the window can create additional issues and challenges. The program calculates the dogleg severity for a liner or BHA pass-through in addition to forces and stresses on the liner or BHA. The total quantity of cuttings that would be generated from the milling operation while cutting two strings of casing was also analyzed.
This methodical planning resulted in a successful dual-casing exit operation. The success is the result of a proactive planned initiative to mitigate BHA shock loading, which included real-time monitoring using a predictive compressive-strength analysis system. The proactive plan also increased confidence in the FEA-based modeling system's ability to accurately identify the root cause of damaging vibrations while sidetracking through carbonates in a dual-casing Kuwait well.
Alimuddin, Sultan (M-I SWACO, A Schlumberger Company) | Sharma, Sunil (M-I SWACO, A Schlumberger Company) | Mahadeshwar, Sachin (M-I SWACO, A Schlumberger Company) | Marinescu, Pavel (M-I SWACO, A Schlumberger Company) | Raman, Chakrapani Venkat (M-I SWACO, A Schlumberger Company) | Kumar, Yogesh (M-I SWACO, A Schlumberger Company) | Velavaraj, Nirmaladevi K (M-I SWACO, A Schlumberger Company) | Panicker, Santosh (M-I SWACO, A Schlumberger Company) | Rahim, Syed Abdul (Schlumberger)
To maximize oil and gas production, it is paramount to reach the whole reservoir and extract hydrocarbon resources efficiently. Moreover, to reduce the costs in today's market, the well should be drilled in minimum operating time with no operational failures. This paper presents a detailed study and outline of a neoteric practice of using a wellbore strengthening while drilling, to drill a depleted deepwater reservoir and eliminate nonproductive time related to downhole losses. This novel solution has the potential to be used while drilling depleted reservoir sections in all Middle East areas.
In a deepwater block situated on India's east coast, synthetic-based reservoir drilling fluids are used to drill the reservoir section. While drilling depleted reservoir sands, dynamic losses amounting to 300 bbl/hr were encountered that led to nonproductive time and even abandonment of well. To continue the drilling campaign and lessen the downhole losses, fracture sizes of depleted reservoir sands were simulated using proprietary software. Considering the measurement-while-drilling (MWD) tool's limitations and other reservoir behavior, a reservoir drilling fluid with wellbore strengthening material was formulated. Extensive laboratory tests were conducted to confirm the bridge and sealing capability of the solution. Subsequent to laboratory testing, the same reservoir drilling fluid formulation was field trialed. The well was drilled successfully with no hindrance, except minor losses encountered at the top of the sand. Implementing this customized solution, combined with precise running strategy, led to effective results in more than four wells to date.
This paper presents a comprehensive study of drilling depleted zones using wellbore strengthening while drilling, identifying ideal products, studying reservoir compatibility, calculating cost effectiveness, evaluating overall performance based results, and overcoming challenges while implementing the strategy in deepwater wells. A detailed comparison of all the challenges that occurred while drilling and the proper troubleshooting steps are also discussed. Finally, the paper aims to compare the existing results with previous drilling techniques, which may help operators with the future development of respective fields. In this application, new technology of reservoir-friendly, loss prevention materials of ultra large size were used successfully.
Meza, O. Grijalva (Institute of Petroleum Engineering, Clausthal University of Technology) | Kamp, K. (Institute of Petroleum Engineering, Clausthal University of Technology) | Asgharzadeh, A. (Institute of Petroleum Engineering, Clausthal University of Technology) | Bello, O. (Institute of Petroleum Engineering, Clausthal University of Technology) | Freifer, R. (Institute of Petroleum Engineering, Clausthal University of Technology) | Oppelt, J. (Institute of Petroleum Engineering, Clausthal University of Technology)
The technique of drilling a wellbore by using casing instead of drill pipe (Casing Drilling-CD) is gaining in relevance within the Oil & Gas sector since its implementation in the last decades. This technique, aside from the evident reduction in drilling time and costs observed whenn applied is convenient to minder the effects of certain while-drilling issues as those arising while drilling unstable formations. The focus of concern in this work will be the geometry-related aspects of Casing Drilling influencing not only the drilling operation itself but its particular well control needs as well; this latter will be explained in detail.
The effectiveness of completion fluids prior to the actual cost and risk of implementation is critical to evaluate. High salinity/ high pH brine can cause formation damage to sandstone formation following well completion operations. The magnitude of damage depended on the fluid/fluid and fluid/rock proprerties.
This work demonstrates the experimental results to evaluate the effect of completion fluid pH on sandstone minerals and the compatibility with the formation water.
Solids and core plugs analysis were conducted using XRD. ICP analysis of three completion fluid samples was performed to determine its elemental composition. Fluid/rock interactions assessment were conducted using zeta potential analysis.
Scaling of calcium sulfate andsalt self-precipitation occurred when high pH completion fluid was mixed with formation water. Zeta potential results showed that sand stone minerals were less stables at high pH.
Hawy, Ahmed El (Schlumberger) | Picha, Mahesh Shrichand (Is'Haq Habsi, PDO) | Soliman, Fathy (Is'Haq Habsi, PDO) | Haeser, Patrick A C M (Is'Haq Habsi, PDO) | Hadhrami, Moosa Al (Is'Haq Habsi, PDO) | Kindi, Adil Al (Is'Haq Habsi, PDO) | Eljenni, Mounir (Is'Haq Habsi, PDO) | Busaidi, Ibrahim AL (Schlumberger) | Busaidi, Adil Zahran Al (Schlumberger) | Bazara, Magdi (Schlumberger) | Omara, Ahmed Sadig (Schlumberger)
As conventional drilling learning curves mature from drilling simple vertical wells to deviated wells to complex multi-lateral horizontal wells, the boundaries needed to be broken to reach much deeper depths rather than consuming the time in drilling multiple shorter laterals.
Horizontal ERD wells in Qarn Alam cluster were planned to be drilled in four sections where the 17.5-in section is drilled vertically followed by a deviated 12.25-in section and continued by landing in 8.5-in section and finally the 6.125-in horizontal lateral.
Many attempts of performance improvement initiatives were executed over many years however there were always flaws and inconsistency in drilling performance delivery. As the need of ERD grew, a detailed offset wells analysis had to be performed where all the deficiencies and issues had to be pin pointed, RCA (Root Cause Analysis) had to be performed and plans for success had to be laid out.
From challenges achieving required dog legs in the top sections with increased risks of axial and lateral vibrations, to the difficulties faced in the landing section drilling through unconsolidated and reactive shales, to the difficulties transferring weight to the bit at deeper depths in the horizontal laterals drilling highly porous zones of sticky limestones resulting in severe torsional vibrations. A new approach of drilling had to be executed with a renovated set of drilling parameters envelopes, revised trajectory designs, re-engineered BHA designs, right choice of fit for purpose bits and effective real-time performance monitoring.
Continuous development of drilling technology has enabled the oil and gas industry to drill deeper and more complex well paths. Drilling dynamics measurements have been the dominant contributor to rate of penetration maximization, overall drilling optimization and downhole assembly reliability assurance for more than three decades.
A consequence of today's complex downhole assemblies and well paths are higher downhole forces and vibrations. These conditions require more quality drilling dynamics information than before for safe and efficient drilling. Driven by this demand, new developments in downhole and surface equipment have made available larger amounts of drilling dynamics data with higher sample rates. In parallel, development of reliable high-speed telemetry allows the high-resolution drilling dynamics data to be utilized on surface to deliver answers while drilling. These developments were made possible due to the recent advent of high-performance downhole-capable electronic technologies, as well as the availability of increased computation power for signal processing at the rig site.
This paper describes improvements in the drilling dynamics measurement systems to overcome the challenges imposed by deeper and more complex wells. Gathering, processing and transmitting drilling dynamics data at high rates introduces challenges due to tighter downhole sensor requirements, the required digital signal processing power, amount of available memory, electronics temperature tolerances and telemetry requirements. Optimized hardware design, signal processing and enhanced telemetry sequences and methods are answers to these challenges, to ensure the adequate performance of drilling dynamics measurement systems. These improvements allow a fast response to new drilling conditions, the adjustment of drilling parameters to changes in formation, and a rapid evaluation of drilling performance. This enables field personnel to make decisions focused on drilling optimization, and these case histories are added to advance drilling optimization best practices.
The drilling dynamics measurement system described in this paper has been successfully run in challenging fields in the North Sea and Middle East. Compared with offset runs, the system has significantly increased data quality and sample rate and provided, in addition to industry-standard-measurements, unique measurements for the identification and mitigation of high-frequency torsional oscillations. Examples of the improved capability and operational performance are provided.
This paper also highlights changes necessary to further improve drilling dynamics measurement systems for evolving real-time drilling optimization needs.
Wood, Stuart (Halliburton) | Comb, Lachlan (Halliburton) | Singh, Mandeep Kuldeep (Halliburton) | Lavery, Joshua (Halliburton) | Biddle, Matthew (DDG Operations Pty Ltd.) | Hyatt, Paul (DDG Operations Pty Ltd.)
Smart well completions include downhole gauges, sliding circulation valves, open/close safety valves, control lines, and fiber cables or a combination of these. One method for deploying this downhole equipment is achieved by affixing it to the outside of the casing and permanently cementing it in place; however, a challenge with external-casing equipment is helping to prevent damaging the installation if perforating is the chosen method to establish effective communication between the wellbore and formation. This challenge is further magnified when the well is drilled near-vertical and run on the outside of a large-diameter casing.
This paper discusses the execution of an engineered design of service to perforate a 7-in. diameter production smart well completion using 4 5/8-in. tubing-conveyed perforating (TCP) gun assemblies. As part of the completion design, the TCP gun assemblies were hung below the bottomhole assembly (BHA). A fiber-optic (FO) package was run external to the casing, and the well had a deviation less than 5°, preventing the use of high-side logging tools.
Various options, discussed later in this paper, were considered to locate the azimuthal orientation of the fiber cables, including a new-to-market technology tool. Ultimately, a method was devised to engineer an ultrasonic logging tool to be deployed in conjunction with a north-finding gyroscope tool to accurately determine the location of the external-casing equipment. TCP guns were then hung below the tubing string, which included a fixed-point orienting sub that could be used to confirm the direction of all the planned perforations. To achieve operational and economic objectives, the TCP assembly was dropped to the bottom of the well so that the well could be immediately placed on production without killing the well or retrieving the spent perforating guns.
The well was successfully perforated without damage to the external-gauge equipment, showcasing that collaborating with the operator, and understanding their value drivers, led to an engineered solution that maximized the asset value of the well.
Alsubaih, Ahmed (Basra oil Company/Basrah University For Oil and Gas /Oil And Gas Engineering College) | Albadran, Firas (Basrah University For Oil and Gas/ Oil And Gas Engineering College) | Alkanaani, Nuhad (Basrah University /College of Engineering)
The Mechanical Specific Energy (MSE) and Statistical Analysis Approach (SAA) have been widely implemented in oil and/or gas well drilling industry to enhance the Rate of Penetration (ROP) and reduce the operation cost. This work focuses on predicting and optimizing the drilling efficiency and performance in the production section of Mishrif reservoir in southern Iraq fields. The drilling data from twenty-five wells has analyzed and examined to improve the drilling productivity relied upon MSE and statistical approaches. By using MSE technique, the minimum required energy to drill unit volume of each formation has determined to improve the drilling speed and avoid unnecessary energy consumption that may come out in the form of bit wearing / balling or vibration. The optimum energy is achieved when the MSE value comes close to the unconfined compressive strength (UCS) value that obtained from the empirical formula for limestone and shale rocks. The flounder and threshold points have recognized to optimize drilling data in the offset wells to enhance ROP in the future wells. In the statistical approach, the regression coefficients have obtained from the screened and filtered fields drilling data then the empirical equations to estimate ROP have constructed by using linear regression analysis through a commercial software. The optimization techniques lead to an impressive increase in the rate of penetration in the production section of the Mishrif reservoir. The MSE surveillance provides a reliable tool to maximize the ROP and reduce some drilling problems by using sufficient energy to drill each formation below the flounder point. An excessive energy consumption throughout drilling can be observed in the majority of wells been investigated. Thus, the non-productive time has mitigated considerably by utilizing drilling variables that have induced MSE equal to the unconfined compressive strength of the rocks. On another hand, the statistical analysis of real-time data for twenty-seven wells revealed a remarkable improvement in drilling performance by suggesting an empirical equation that predicts ROP through changing some key parameters such as Flow Rate (FL), Weight On Bit (WOB), Torque (TQ), Revolution Per Minute (RPM), Mud Weight (MWT) and Total Flow Area (TFA). The recommended drilling parameters resulted from this work can be used to reduce the drilling cost and prevent/mitigate the time-dependent failure in the production section.