{"title":"Annuli Material Pseudo-Density Estimation from Standard Integrity Logging Data","authors":"I. Merciu","doi":"10.2118/212459-ms","DOIUrl":"https://doi.org/10.2118/212459-ms","url":null,"abstract":"\u0000 Bonding to casing material characterization is a topic of interest in the context of well barrier evaluation. There is a consolidated need directed to log data interpreters to answer questions related to the type of material present in the casing annuli of a given well. The objective of this work is to explore the possibility to provide a complementary answer to current general acoustic impedance and attenuation practice.\u0000 We reiterate that knowledge about the density of the annuli material can reduce the well barrier evaluation uncertainty. We are describing and exemplifying a rapid method to estimate the \"pseudo – density\" of the material in the annuli at the time of data acquisition. We define \"pseudo-density\" as the ratio between estimated impedance (from ultrasonic pulse-echo) and annuli apparent velocities (from ultrasonic oblique incidence techniques). Resulting \"pseudo-density\" maps are constrained with prior information from geology, logging, and drilling data. This allows the interpreter to judge the uncertainty in the current interpretation practice and contextualization of the annuli material into the borehole reality.\u0000 The examples provided show that when the underlying physics principles are met, the results are clear and a robust interpretation at scale along the entire logged path is possible. The estimated complementary results are affected by inherent errors and uncertainty associated with acoustic impedance and velocity estimation. However, using prior knowledge information, intervals with high uncertainty (such as unusually high impedances or large errors in the velocity estimation) are flagged providing the interpreter with information background easy to be used for final delivery.\u0000 Along with standard applications, the proposed method includes the basic mandatory tool for evaluating, validating, and incorporating the forecasted growth based on nuclear integrity logging behind the casing evaluation techniques.","PeriodicalId":382692,"journal":{"name":"Day 1 Tue, March 07, 2023","volume":"321 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131770269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ioannis Marios Beltsidis, C. Georgopoulou, G. Dimopoulos, Lefteris Koukoulopoulos
{"title":"Concept assessment of a marine carbon capture system for vessel regulatory lifetime extension","authors":"Ioannis Marios Beltsidis, C. Georgopoulou, G. Dimopoulos, Lefteris Koukoulopoulos","doi":"10.5957/some-2023-043","DOIUrl":"https://doi.org/10.5957/some-2023-043","url":null,"abstract":"Anthropogenic Greenhouse gas emissions increase rapidly throughout years, forcing International Maritime Organization (IMO) to set strict targets on reducing emission in shipping. Carbon Capture (CC) could be one of the solutions within the decarbonization spectrum, given its potential for significant emission reduction. The shipping community is already exploring CC solutions through concept studies, joint development projects and pilot demonstrations. However, no clear window for CC inclusion in CII calculations has been provided by IMO, at the time this paper is written. The objective of this paper is to explore on a concept design level, the capacity of a CC system to improve the CII of a VLCC tanker vessel, to ensure regulatory compliance throughout her life expectancy. Newbuilt and conversion assessment is conducted, accounting for the vessel’s annual operating profile and the benefits of tight heat integration. To calculate the CC performance, a process model is developed of a conventional amine-based carbon capture system integrated to the ship machinery, with and without waste heat recovery (WHR) for CC heat supply. At design conditions all features of CCS and WHR components are determined. At operating conditions, estimates of pumping and compression requirements, reboiler duty and WHR production capacity are evaluated and accounted for in the total footprint of the ship. The results are annualized and compared to baseline no CCS conditions. The associated increase in fuel consumption due to CC use is estimated, along with the CC system’s capital and operational costs.","PeriodicalId":382692,"journal":{"name":"Day 1 Tue, March 07, 2023","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114374965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Johan Kverneland, Pierre-Marie Drevillon, Daniel M. Tomczak, D. Gardner
{"title":"System Integration Test (SIT) of Technology Enabling Through-Tubing Rig-Less Plug and Abandonment","authors":"Johan Kverneland, Pierre-Marie Drevillon, Daniel M. Tomczak, D. Gardner","doi":"10.2118/212548-ms","DOIUrl":"https://doi.org/10.2118/212548-ms","url":null,"abstract":"\u0000 A System Integration Test (SIT), designed to investigate the performance of technology enabling through-tubing rig-less plug and abandonment is described. A key objective of this SIT was to verify and de-risk tools and techniques prior to their potential deployment in an offshore target well.\u0000 A deepwater well, located offshore Brazil, was used as the basis for the design of the SIT program. The objective of the well operation was to permanently isolate the production tubing and the A-annulus in which a flatpack containing 2x chemical injection lines and 1x electrical line is present. To ensure the flatpack would not provide a leakage pathway it had to be cut into pieces prior to cementing the A-annulus.\u0000 A completion string mimicking the main features of the well was designed utilizing 10 ¾in. casing, 6-5/8in. tubing with a flatpack and a restriction created by the downhole safety valve (DHSV). The completion was installed inside a large diameter test well and thereafter the technologies to be verified were deployed using wireline and rigless coiled tubing interventions.\u0000 After installation of the test well completion, the performance of various technologies was investigated through the following operations:\u0000 Flatpack detection with four different e-line ultrasonic & electro-magnetic tools Flatpack ablation with custom designed oriented shaped charges utilizing two different gun designs run on wireline Through tubing cement placement utilizing a Perf, Wash & Cement technique deployed on coiled tubing Coiled tubing cement mill out using a motor, bit and underreamer able to pass the DHSV and remove the cement plug from the tubing Evaluation of the annular barrier quality using a cement bond logging tool Recovery of the well completion, keeping the A-annulus barrier intact for subsequent inspection at surface and comparison to the log results\u0000 The performance of state-of-the-art technologies that can enable rig-less through-tubing plug and abandonment (P&A) utilizing wireline and coiled tubing interventions have been investigated and de-risked through an SIT executed in a test well completion mimicking an actual offshore deepwater well.","PeriodicalId":382692,"journal":{"name":"Day 1 Tue, March 07, 2023","volume":"149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114636523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Prez, Santiago Callerio, Abraham C. Montes, Çinar Turhan, P. Ashok, E. van Oort, R. Pruitt, T. Thetford, T. Peroyea, M. Behounek
{"title":"Field Testing of an Automated 3D Cuttings and Cavings Measurement Sensor","authors":"S. Prez, Santiago Callerio, Abraham C. Montes, Çinar Turhan, P. Ashok, E. van Oort, R. Pruitt, T. Thetford, T. Peroyea, M. Behounek","doi":"10.2118/212569-ms","DOIUrl":"https://doi.org/10.2118/212569-ms","url":null,"abstract":"\u0000 Observation of cuttings and cavings serves as an important early indicator for hole cleaning and wellbore instability problems. Automation of this critical monitoring process is, however, still in its infancy. This paper highlights the development and initial field testing of a new automated cuttings and cavings monitoring sensor system. Initial challenges identified in an earlier field test, and their solutions that have been incorporated into this new working field prototype, are presented.\u0000 The imaging sensors selected for the prototype, including a 3D laser profile scanner and a machine vision camera, were used in an initial field trial to assess the feasibility of building a prototype that can operate in a harsh field environment. Based on that initial field trial, the prototype was built, and preliminary outdoor tests were conducted offsite to validate its performance. Following that, a second field trial at an active drilling site in West Texas was conducted to assess the implementation and performance of the prototype in the field.\u0000 Practical solutions to key challenges identified in the first field trial were successfully implemented in the new prototype, and its field performance was validated in the second field trial where the prototype was integrated into the solids control system of an active drilling rig, successfully collecting data for during drilling operations. The system accurately measured the volumetric return of cuttings, and the tests demonstrate the ability to determine the cuttings size distribution and detect anomalous-sized cavings. The results can be used directly for improved hole cleaning management and stuck pipe avoidance in field operations.\u0000 This paper introduces the first working prototype of a 3D-imaging cuttings monitoring system that could be taken into production for quantifying the volumetric return of cuttings on surface and providing information about the size and shape of cuttings and cavings. The development of this cuttings sensor is a major milestone in the field of drilling automation, bringing the industry closer to achieving a fully automated hole cleaning and stuck pipe prevention system.","PeriodicalId":382692,"journal":{"name":"Day 1 Tue, March 07, 2023","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116047277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Belov, S. Rocchio, Zhengxin Zhang, Wei Chen, Samba Ba, Eimund Liland, A. Kolyshkin, Yueling Shen, Josh Scribbins, Henry Massie, Kent Phillips
{"title":"Mud Motor Digital Maintenance with an Industry-Unique PHM Solution","authors":"D. Belov, S. Rocchio, Zhengxin Zhang, Wei Chen, Samba Ba, Eimund Liland, A. Kolyshkin, Yueling Shen, Josh Scribbins, Henry Massie, Kent Phillips","doi":"10.2118/212505-ms","DOIUrl":"https://doi.org/10.2118/212505-ms","url":null,"abstract":"\u0000 The ability to analyze drilling data to obtain continuous monitoring statistics of the drilling process and make prompt decisions are two important elements of a successful drilling operation. A mud motor is one of the important components of the downhole assembly, which enables the drill bit to penetrate the rock during drilling a well. Correctly predicting mud motor failure and the remaining useful life of the components are essential for obtaining drilling efficiency, avoiding costly operational expenses, and achieving timely maintenance. The remaining useful life indicator with low uncertainty identifies the life cycle of mud motors by preventing redundant maintenance and costly drilling operation failures.\u0000 This paper presents an industry-unique prognostics and health-management (PHM) solution for monitoring and maintaining the mud motor condition. This solution combines three algorithms, including a power section PHM algorithm, lower-end critical connections PHM algorithm, and mud motor degradation algorithm. The workflow solution allows for obtaining valuable information about the mud motor condition at the system and component levels.\u0000 The power section PHM algorithm, based on a remaining useful life prediction for the mud motor's power section, provides information about the elastomer condition inside of the stator as a percentage of the remaining life cycle. The lower-end critical connections PHM algorithm estimates the remaining useful life of the mud motor's lower-end connections. Both algorithms are component level; i. e., they help to improve managing the life cycle of the appropriate components. The mud motor degradation algorithm is a system-level algorithm. This algorithm uses drilling data to compute the severity of mud motor degradation; thus, identifying possible problems with the mud motor as a complete system.\u0000 The PHM solution helps to prevent expensive mud motor failure. Furthermore, the solution provides the opportunity to perform additional drilling runs before the motor components must be retired or removed for maintenance. The significant advantage of applying the PHM solution is it only makes use of existing drilling measurements and does not require any special downhole equipment.\u0000 The mud motor PHM solution is currently in use by one of the biggest oil & gas service company worldwide. In addition to presenting the three algorithms, this paper presents field application case studies that demonstrate the commercial value and efficiency gains achieved by their use. Significant sustainability benefits have been achieved by using the power section and mud motor degradation algorithms due to their assistance in drilling applications.","PeriodicalId":382692,"journal":{"name":"Day 1 Tue, March 07, 2023","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128050882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. N. Borges Filho, T.P. Mello, C. Scheid, L. Calçada, Alex Tadeu Waldman, G. Teixeira, A. Martins
{"title":"Real-Time Anomaly Detection Methodology for Drilling Fluids Properties","authors":"M. N. Borges Filho, T.P. Mello, C. Scheid, L. Calçada, Alex Tadeu Waldman, G. Teixeira, A. Martins","doi":"10.2118/212443-ms","DOIUrl":"https://doi.org/10.2118/212443-ms","url":null,"abstract":"\u0000 Online drilling fluid measurement technologies are popping up in the industry as an essential tool for drilling automation, while online density measurements are widespread, the availability of rheology measurements is increasing fast and additional properties (o/w ratio, solids content, electrical stability, filtration, etc) appear as field trials. This article presents the concept of a supervisory/ advisory systems dedicated to support the detection of abnormal events and to provide guidelines for fluid treatment actions.\u0000 The proposed methodology consisted of two stages: experimental data acquisition in a flow loop and data processing for the validation of the algorithm. In the data acquisition stage, multiple properties of the drilling fluids were continuously measured by using automatic sensors. In the second stage, the drilling fluid's properties were processed in a fault detection algorithm. The algorithm used Principal Component Analysis (PCA) to train the process model through the calculation of the principal components of the steady state of the fluid, which represents the healthy state of the drilling fluid.\u0000 Once the process was trained, the algorithm monitored new data samples obtained in the data acquisition stage and compared them to the trained model by calculation of the mean square prediction error (MSPE) of the model and the T² of Hoteling. Persistent changes in MSPE and T² values indicated that an anomaly was occurring in the drilling fluid. The new methodology was validated based on the data obtained in a flow loop where fluid properties were monitored using online sensor under different operational conditions. The algorithm was able to detect faults and anomalies in the drilling fluid even identifying the source of the anomalies through the decomposition of the MSPE and T² statistics. The proposed algorithm performed well in real-time conditions, pointing out that it can be used as a diagnostic tool in-field oil well drilling operations.","PeriodicalId":382692,"journal":{"name":"Day 1 Tue, March 07, 2023","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126737268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Qualifying Bit Influence on High-Frequency Torsional Oscillations Based on Full-Scale Laboratory Experiments","authors":"Kueck Armin, Everhard Eliah, Huang Xu, Valbuena Franklin, Reckmann Hanno, Bomidi John","doi":"10.2118/212566-ms","DOIUrl":"https://doi.org/10.2118/212566-ms","url":null,"abstract":"\u0000 High-Frequency-Torsional Oscillations (HFTO) generate dynamic loads that can damage drilling tools, resulting in, for example cracks, twist-offs or broken electronics. They are triggered by the interaction of bits and rocks and force operators to reduce rotary spped (RPM) and weight on bit (WOB) losing drilling performance in the process. Recently, a full-scale drilling test rig was proven to generate verified HFTO behavior under laboratory conditions (Everhard et. al. 2023). This rig allows for a comprehensive study of the influences of bit characteristics on HFTO for the first time. This paper presents methods to qualify bit features to suppress HFTO. Effective HFTO influencing properties are identified and discussed.\u0000 The full-scale laboratory test rig drills rocks in a pressurized rock chamber. ROP, WOB, RPM, pressure, bit type and rock type can be varied. High-frequency measurement instrumentation, including new in-bit sensing, record the tangential accelerations and dynamic torque at various positions in the laboratory rig. The type of excited torsional vibrations match vibrations in the field indicating that learnings in the lab translate to the field. To study the influence of bit and operating parameters on HFTO, PDC-bits of varying design are used to drill rocks under varying pressures, RPMs and WOB. The data are used to develop evaluation methods to rank bit-rock combinations with regards to the stability and severity of the generated vibrations.\u0000 Stability maps relating RPM, WOB, and vibration proved to be a good measure to reliably identify HFTO and rank bit-rock combinations and applied operating parameters, by their susceptibility to HFTO. Bit properties, such as cutter shape, cutter placement or rock type control the energy intake per vibration cycle and, hence, the excitation of torsional vibrations. The operating parameter space indicating stable drilling states can be maximized by properly choosing bit features. Rock types triggering HFTO are identified using segmented core tests. When HFTO is present and fully developed, the severity of vibrations scales with the angular velocity of the bit (RPM) but not with the WOB. If HFTO is absent, WOB and RPM act as an \"on-off\" switch to HFTO. The threshold of WOB and RPM triggering HFTO is established for bit-rock combinations. The stable operating zone can be influenced by adding damping devices to the BHA. The findings also result in recommendations for operating BHAs in the field.\u0000 Studying HFTO in a full-scale laboratory environment using the presented methods enables the development of robust and reliable HFTO countermeasures. Major influences on HFTO are identified and scientifically proven; understanding these characteristics will result in HFTO suppressing bits and tools. Ultimately, HFTO mitigation allows drilling engineers to optimize drilling parameters and reduce drilling time while simultaneously decreasing tool-failure probability and associated NPT and costs.","PeriodicalId":382692,"journal":{"name":"Day 1 Tue, March 07, 2023","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127730520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Greg Skoff, David Fink, A. Poor, O. Gjertsen, Preston Wolfram, R. Santana, R. Ford
{"title":"Automated Offsets for Drill Bit Performance Evaluation, Analysis, and Monitoring At-Scale","authors":"Greg Skoff, David Fink, A. Poor, O. Gjertsen, Preston Wolfram, R. Santana, R. Ford","doi":"10.2118/212464-ms","DOIUrl":"https://doi.org/10.2118/212464-ms","url":null,"abstract":"\u0000 Utilizing big drilling data requires an innovative approach. The service company’s drill bits business is largely based upon an in-house drilling record system (DRS) that captures global bit record performance data. The DRS contains over 1.8 million wells drilled worldwide since 1980 with nearly 5.4 million total BHA runs from over 100 countries. In the last 10 years alone, over 1.4 million bit runs drilling over 2.8 billion ft of formation have been recorded. To utilize this vast amount of data for drill bit performance evaluation, analysis, and monitoring, the innovative approach described in this paper was developed and implemented.\u0000 Traditionally, the performance of a drill bit run–often measured in terms of drilled footage and ROP–has been evaluated versus similar offset runs. Offset runs are chosen in various ways, but are typically done manually by bit engineers, meaning that offset run selection is subjective based on personal experience and bias. Furthermore, people often only evaluate the performance of test bit designs. Instead, we wanted to analyze and monitor the performance of all drill bit runs. To alleviate these biases and enable a wider breadth of considered runs, an objective offset run selection workflow was developed and implemented within DRS. Offset runs are selected based on a sophisticated filtering and scoring routine that considers many characteristics such as geographic location, time, wellbore and drilling system design, along with lithology. As new data enters DRS continuously, this workflow runs on a regular basis using an automated pipeline.\u0000 The performance evaluation results of the automated offset selection workflow are available to all data analysts (engineers and salespeople) both inside DRS and extensible applications to aid in performance monitoring and new product development target-setting. Product performance is now objectively evaluated at-scale across geographies and always utilizing apples-to-apples comparisons. The workflow has proven itself quite useful and delivered business value already but also exemplifies the need for both enhanced data quality and improved bit record data capture rate. These are ongoing efforts to further enhance and improve this workflow.\u0000 Automated workflows like this one can help our industry by eliminating repetitive biased tasks and allowing people to focus on more creative processes leveraging objective data. Developing new drill bit designs, material selections, or component selections to overcome new challenges are creative processes which contribute to increased drilling performance and lower costs for the industry.","PeriodicalId":382692,"journal":{"name":"Day 1 Tue, March 07, 2023","volume":"347 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134357170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Johnson, M. Balka, Sameer Bhoite, Paul Crerar, Aaron Simon, J. Quiñones
{"title":"Mitigation of Drilling Dysfunction: Data Analysis and Physical Modelling Shine a New Light on HFTO","authors":"A. Johnson, M. Balka, Sameer Bhoite, Paul Crerar, Aaron Simon, J. Quiñones","doi":"10.2118/212500-ms","DOIUrl":"https://doi.org/10.2118/212500-ms","url":null,"abstract":"\u0000 High frequency torsional oscillation (HFTO) is still one of the most disruptive drilling dysfunctions we encounter. Vibrations are observed with fundamental frequencies as high as 400 Hz and torque sweeps from 0 to 7000 lbf.ft. The resulting damage includes drilling collar cracking, damaged electronics, and backed-off tools.\u0000 By measuring the amplitude and the fundamental frequency of this dysfunction, we present a model to characterize its drivers. This is a critical step in defining the mitigation strategies.\u0000 Although there are a multitude of drilling dynamics tools deployed to record these effects, the nature of HFTO, with large amplitude harmonics on top of the fundamental modes, means that simply deploying a sensor and data acquisition tool is not sufficient to characterize the dysfunction. There are critical requirements for these recorders in terms of sampling frequency and anti-aliasing filters, without which a unique interpretation of the dynamics is impossible.\u0000 We have a next-generation MWD tool that will detect HFTO. By calculating a fast fourier transform (FFT) in real time, it will also deliver a log of HFTO throughout the operation, that can be delivered to the driller in real time.\u0000 With this we have developed and demonstrated a suite of mitigation strategies. These are specific to the type of HFTO detected and include increasing the collar speed or reducing the WOB (for Type 2) or reducing the rate at which the WOB is increased (for Type 1). We also show that by changing the contact points on the tool to reduce the side force (friction), the operator can mitigate the Type 2 HFTO and achieve a considerable improvement on this drilling dysfunction and its impact.","PeriodicalId":382692,"journal":{"name":"Day 1 Tue, March 07, 2023","volume":"254 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134529662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dimitris Georgousis, Kristian Nielsen, J. Petersen, Alexandr Adveev, Eirini Arvanitaki, Sergey Tuymetov
{"title":"Estimation of wind, waves and fouling effect on ships from full scale and hindcast data","authors":"Dimitris Georgousis, Kristian Nielsen, J. Petersen, Alexandr Adveev, Eirini Arvanitaki, Sergey Tuymetov","doi":"10.5957/some-2023-008","DOIUrl":"https://doi.org/10.5957/some-2023-008","url":null,"abstract":"Assessment of vessel performance requires estimating various types of added resistance to the calm water resistance, with the most significant caused by the presence of wind, waves and fouling of the hull and propeller. In this paper, the performance prediction system VESPER is applied to the estimation of added resistance for two fleets, one of bulkers and one of containerships. Firstly, the bias and error of measurements from ship-mounted anemometers is investigated. The measured wind speeds were corrected for the anemometer height and compared with hindcast data. Two different pairs of anemometer heights and wind shear exponents were used and the Mean Bias Percentage Error (MBPE) between the anemometer and hindcast data was evaluated. The study showed an overestimation of wind speed from the anemometers due to flow acceleration by the presence of the superstructure and the ship itself. The acceleration was higher for containerships compared to bulkers. Also, for both fleets the acceleration was higher for side winds. Additionally, the change of the average Confidence Interval of the calculated total added resistance is presented after applying corrections for wind, waves and currents, using both the above wind data sets with and without corrections. For both fleets, the effect of fouling was calculated significantly higher compared to the effect of the weather. Finally, the SPAWAVE method was applied to quantify the effect of waves, which, relative to the total added resistance, was calculated stronger for the bulkers compared to the containerships, while the effect of the wind was similar between the two ship types.","PeriodicalId":382692,"journal":{"name":"Day 1 Tue, March 07, 2023","volume":"113 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128902502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}