Day 2 Wed, March 27, 2019最新文献

{"title":"Laboratory Comparison of Natural Fractures and Induced Fracture Permeability Variations Under Simulated Dynamic Reservoir Conditions","authors":"A. Santagati, Adnan H. Makrami, Edwin T. Caliboso","doi":"10.2523/IPTC-19089-MS","DOIUrl":"https://doi.org/10.2523/IPTC-19089-MS","url":null,"abstract":"\u0000 The objective of this study is to compare the laboratory behavior of natural (Mode II) and induced (Mode I and II) fractures during stress-dependent permeability tests (SDk) to verify under which conditions the hydraulic behavior of induced fractures may be assumed to be representative of that of in-situ natural fractures.\u0000 Fracture modes are identified by the way the force that enables the crack to propagate is applied and may be of three different types. Mode I fractures (propagated by a tensile stress normal to the plane of the crack) and Mode II fractures (propagated by a shear stress acting parallel to the plane of the crack and perpendicular to the crack front) are of import in the present study.\u0000 To test under which conditions this assumption may hold, cylindrical specimens of different rock types including plugs with an intact matrix and plugs with a natural fracture propagating through their body were selected. When possible, the plugs were grouped in pairs so as to form homogeneous sets characterized by a coherence in specific matrix properties (porosity, density, permeability), with each pair including a plug containing a natural fracture. Induced Mode I and Mode II fractures were then propagated axially through the intact specimens and each plug set was tested for SDk. All of the tests were run under similar triaxial test conditions.","PeriodicalId":105730,"journal":{"name":"Day 2 Wed, March 27, 2019","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130022015","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":"Recent Development and Remaining Challenges of Iron Sulfide Scale Mitigation in Sour Gas Wells","authors":"Tao Chen, Qiwei Wang, F. Chang, N. Aljeaban","doi":"10.2523/IPTC-19315-MS","DOIUrl":"https://doi.org/10.2523/IPTC-19315-MS","url":null,"abstract":"\u0000 Iron sulfide scale deposition can be a significant flow assurance issue in the sour gas production systems. It can deposit along the water flowing path from near wellbore reservoir area to surface equipment, which results in formation damage, causes tubing blockage, interferes with well intervention, and reduces hydrocarbon production.\u0000 The main objectives of this paper are to review on the new advancements and remaining challenges of iron sulfide scale management in sour gas wells, covering the mechanisms of iron sulfide formation; the mechanical and chemical removal techniques; and the prevention strategies.\u0000 This paper gives a special emphasis to the different mechanisms of iron sulfide formation during well completion and production stages, especially the sources of ferrous iron for scale deposition. It is essential to understand the root-cause in order to identify and develop suitable technologies to manage the scale problem. The paper also summarizes the latest developments in mechanical methods and chemical dissolvers for the removal of iron sulfide deposited on downhole tubing. The capabilities of the current chemical dissolvers is discussed and the criteria of effective dissolvers are provided to serve as a guide for future development. Then the paper provides an overview of recent developments on iron sulfide prevention technologies and treatment strategies. It differentiates the treatment approaches for corrosion byproduct and scale precipitation and scale inhibitor deployment through continuous injection and squeeze treatment. Finally, the paper outlines the technical gaps and areas for further research and development efforts.\u0000 This paper provides the latest review on irons sulfide formation and mitigation with an attempt to integrate viable solutions and expose workable practices.","PeriodicalId":105730,"journal":{"name":"Day 2 Wed, March 27, 2019","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121977836","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":"Study and Field Application of New Agent for Casing Repair in High Temperature and High Salinity Reservoir","authors":"Meng Xiangjuan, Pan Zhaocai, Chen Defei, Su Zhou, Wang Peng, Liu Ju, Jianxin Shen, Cao Xianping, Bai Xiaofei","doi":"10.2523/IPTC-19553-MS","DOIUrl":"https://doi.org/10.2523/IPTC-19553-MS","url":null,"abstract":"\u0000 Casing failure probability is high in Tarim Oilfield, due to high pressure high temperature and high sality operational environment, near 6% of total wells were damaged during their production life, which has serious impacts on the development well pattern, resulting in unbalanced injection-production.\u0000 Based on the analysis of the situation and distribution of casing damage in the Tarim Oilfield, which located in northwest of China, was discovered in 1989, Its production formation has unwanted characteristics of high temperature (150°C) and high salinity (250000mg/L), in order to treatment the casing damage wells, a new type of chemical plugging agent named LTTD was synthesized on the basis of LTSD and its resistance to acid, temperature and salinity were carried out by experiments to evaluate the property of new chemical plugging agent.\u0000 The plugging strength of LTTD and G-grade cement solidified body in different periods was studied by simulating the actual conditions of Tarim Oilfield, the mechanical properties of adhesive interface between LTTD and G-grade cement under dynamic condition were evaluated and microscopic observation of adhesive interface under dynamic condition were carried out.\u0000 The experimental results show that the new plugging agent is characterized by marked improvement of performance and the enhanced resistance to acid, high salinity and high temperature conditions, moreover the formation of \"the interpenetrating network structure\" with high pressure bearing capacity in short time. In the actual condition of Tarim Oilfield, the plugging strength of LTTD plugging increase with the increase of temperature, which is higher than the strength of G-grade cement, during dynamic process, LTTD plugging is superior to G-grade cement in less amount of dissolution of calcium in hydration process and in better anti-channeling performance. Microscopic observation shows that both the inner and the bonding surfaces of the LTTD blocking agent have compact microstructure, which could effectively avoid the excessive formation of hydration product on bonding interface, and could produce hydration products against erosion, with strong self-healing ability and improve plugging quality.\u0000 Field tests show that not only repair casing damage successfully, but also promote the oil production. Therefore, the development of new plugging agent can improve the ultimate recovery of Tarim oilfield. This article provides a type of plugging agent for solving the casing damage and the result may be valuable to develop the similar oilfields.","PeriodicalId":105730,"journal":{"name":"Day 2 Wed, March 27, 2019","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126756231","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":"Towing Characteristics of Large-Scale Concrete Caission for Offshore Modularised LNG Terminal","authors":"Yanjian Peng, Chang-Xue Feng, Chao Zhang","doi":"10.2523/IPTC-19401-MS","DOIUrl":"https://doi.org/10.2523/IPTC-19401-MS","url":null,"abstract":"\u0000 \u0000 \u0000 The innovations of marine LNG terminal concepts are a hot area of research for several years. In order to study the towing and sinking hydrodynamic properties of the large-scale concrete LNG terminals, the basin test and numerical simulation was carried out to simulate the dynamic motion of the concrete LNG terminals towed to the site and sinking on the seabed.\u0000 When the caission is placed, the caission generates motion under the action of the waves, and the caission is restrained by the control cable during the movement. Based on the stability and safety considerations of caission sinking construction under the marine environment conditions, it is necessary to know the motion state of the entire sinking process of caission. Therefore, it is necessary to numerically predict the motion response of caission.\u0000 The force anlysis of the caission structure in water is a viscous wave-making problem a bluff body in a restricted area. In the viscous medium with infinite domain, the flow around the object can only be solved satisfactorily when the Reynolds number is small. The caisson involves not only the blunt body but also the large Reynolds number of the medium and the influence of restricted boundary and free surface. Therefore, it is generally believed that the most reliable method is experimental research. As the caisson section is square and blunt, the flow separation point is stable, which creates conditions for self-similarity in experimental study. Therefore, in theory, the experimental study can obtain quite satisfactory results. The main purpose of the towing tests is to investigate the dynamic behavior and characteristics of the caisson and the line tensions during towing out from the dry dock to the sea area in waves and currents.\u0000 Related work on towing of Large-scale structure. Kyozuka, Y. et al.[1] conduct numerical simulation of the tidal flow and ecosystem in the sea around a very large floating structure or a Mega-Float, and simulation results with/without a Mega-Float of 4.75 km length, 1.5 km breadth and 1.2 m draft in Tokyo Bay are described. Zhang, Puyang et al. [2]When the wave height increases from 1 to 1.5m, the accelerations in six directions increase, especially surging acceleration. Besides, if the wave height is up to 5 m, the bucket foundation loses stability and may overturn in the water. Xiao, L F et al.[3] carried out mooring,towing and installing tests on immersed tunnel caissons in basin to investigate the motions and line tensions, and present that the maximum tension exists in the case that half caisson is exposed to waves and currents in the towing operation. Based on the frequency domain analysis through hydrodynamic software AQWA-Drift module, Zhu W L et al.[4] decomposed wave frequency motion and low frequency motion using the computed motion response, and calculate the full frequency response energy spectrum. Furthermore, introduced kinds of multi- ship towing solution and analyzing its application range a","PeriodicalId":105730,"journal":{"name":"Day 2 Wed, March 27, 2019","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126035076","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":"Advanced Study of Pore Structure and Mechanical Property Change of Tight Sand Due to Thermochemical Treatment","authors":"A. Al-Nakhli, M. Mahmoud, H. Al-badairy, M. Alqam","doi":"10.2523/IPTC-19150-MS","DOIUrl":"https://doi.org/10.2523/IPTC-19150-MS","url":null,"abstract":"\u0000 The demand for unconventional gas is rapidly increasing to provide enough energy to maintain sustainable growth for industrial countries. Even oil producers can develop UG to be directed to internal industrial and power consumptions. As Unconventional gas reservoirs are located in deep high-stress formations, one of the critical challenges gas producers are facing is to develop a cost effective stimulation method that can reduce production cost to lower than Break-even.\u0000 In this paper a novel stimulation method, based on thermochemicals, is introduced. Thermochemicals when injected in tight reservoirs generate localized pressure-pulses, which result in creating microfractures, improve permeability and increase stimulated reservoir volume (SRV). Tight core samples were treated with thermochemicals and the impact on mechanical properties were studied. Generated localized pressure was clearly detected during Coreflood treatment. Microstructural and mineralogical properties were also investigated using microscopy and spectroscopy. CT-scan, micro CT-Scan, Young's modulus, Poisson's ratio and ultrasonic velocities were measured pre and post treatment. Results showed creation of fractures and microfractures, which resulted in improved rock conductivity.\u0000 Results show that, micro-factures are created inside the used sample due to the in-situ generation of heat and pressure. The density of those micro-factures is strong function of the chemical concentration and the injected volume. Creation of micro-factures leads to improve the formation conductivity and reduce the capillary forces, therefore, enhances the hydrocarbon recovery. The outcome of this study is to understand the impact of thermochemical treatment on rock integrity. The ultimate objective is to establish a relationship between the injected chemicals and the alterations of formation properties such as permeability and porosity. This work will serve as a baseline for designing and conducting thermochemical operations for hydrocarbon reservoirs.\u0000 In this study a novel stimulation technique to increase stimulated reservoir volume (SRV) is presented. In basins with excessive tectonic stresses, the current novel treatment can become an enabler to deeply stimulate well stages which otherwise left untreated. A new methodology is developed to lower fracturing cost and increase unconventional gas production. A better connectivity reduces the required number of hydraulic fracturing-stages.","PeriodicalId":105730,"journal":{"name":"Day 2 Wed, March 27, 2019","volume":"2004 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125796548","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":"Risk Management in Deepwater Exploration Well: Reduced Depth Uncertainty Through Acquiring Seismic While Drilling","authors":"Agung Purnomo, Tenny Octaviani, G. Paterson, I. Pasaribu, Ryota Mori, A. Ahmed, Kenichi Akama, Muhamad Faizol Badrul Aini","doi":"10.2523/IPTC-19212-MS","DOIUrl":"https://doi.org/10.2523/IPTC-19212-MS","url":null,"abstract":"One of the key for successful drilling through carbonates build up structure is accurate time depth information to avoid kick-loss scenario during drilling if the carbonate is accidentally penetrated in the unexpected shallower hole size. Setting the casing point accurately to isolate the high overpressure regime on the overlying shale above the carbonate is required. During Kangean operation, Geostopping using Seismic While Drilling (SWD) technology was applied for setting the 9 5/8\" casing before penetrating the Prupuh carbonate formation and updating the pore pressure model. This paper will demonstrate an application of SWD in Indonesia’s deepwater operation of predicting critical carbonate depth enabling well construction on time and on budget.\u0000 Acquisition of SWD was done during an acoustically ‘quiet’ period, during stand connections while pumps are off. Real-time waveforms are transmitted to surface through the mud telemetry system and sent to processing center via secure connection systematically after each seismic level acquired. Processing was done in real-time providing updated time-depth information, placing bit position on the seismic section in depth domain for refining depth prediction and ultimately Vertical Seismic Profile (VSP) corridor stack containing seismic reflectors along the wellbore and ahead of the bit for look-ahead information. The real-time updated interval velocity was used to update pore pressure model for monitoring the overpressured zone and to adjust mud weight accordingly while drilling to prevent a kick situation.\u0000 A total of 27 real-time SWD levels were acquired during drilling over interval ~1,800 ftMD. The data was found to be of a high quality that allowed for an accurate well tie of the Prupuh Carbonate top with a final depth prediction. Real time velocity showed that velocity of Cepu shale above the Prupuh carbonate was slower than pre-job velocity model, meaning that the Prupuh carbonate depth is shallower than initial prediction. Real time decision was made to set the casing before Prupuh Carbonate top. The actual Prupuh top was 23 ft deeper than the latest real time Prupuh prediction. This SWD technology allows us to reduce top carbonate uncertainty from +697 ft/-375 ft to become +/− 23 ft and ultimately saved the well from potential catastrophic event.\u0000 This study demonstrates that SWD technology give us confidence to manage risk in real-time.","PeriodicalId":105730,"journal":{"name":"Day 2 Wed, March 27, 2019","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126869011","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":"Rate of Penetration Prediction in Shale Formation Using Fuzzy Logic","authors":"S AbdulmalekAhmed, S. Elkatatny, Abdulwahab Ali, M. Mahmoud, A. Abdulraheem","doi":"10.2523/IPTC-19548-MS","DOIUrl":"https://doi.org/10.2523/IPTC-19548-MS","url":null,"abstract":"\u0000 Rate of Penetration (ROP) means how fast the drilling bit is drilling through the formations. It is known that in the oil and gas industry, most of the well cost is taken by the drilling operations. So, it is very crucial to drill carefully and improve the drilling processes. Nevertheless, it is hard to know the influence of every single parameter because most of the drilling parameters depend on each other, and altering an individual parameter will have an impact on the other. Due to the difficulty of the drilling operations, up to the present time, there is no dependable model that can estimate the ROP correctly. Consequently, using the artificial intelligence (AI) in the drilling is becoming more and more applicable because it can consider all the unknown parameters in building the model.\u0000 In this work, a real filed data that contain the real time surface drilling parameters and the drilling fluid properties were utilized by fuzzy logic (FL) to estimate the rate of penetration. The achieved results proved that fuzzy logic technique can be applied effectively to estimate the rate of penetration accurately with R = 0.97 and AAPE = 7.3%, which outperformed the other ROP models. The developed AI models also have the advantage of using less input parameters than the previous ROP models.","PeriodicalId":105730,"journal":{"name":"Day 2 Wed, March 27, 2019","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128390135","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":"Exploring Opportunities for Capacity Enhancement in Sour Gas Treatment Unit","authors":"S. Deshpande, J. Sukanandan","doi":"10.2118/175751-MS","DOIUrl":"https://doi.org/10.2118/175751-MS","url":null,"abstract":"\u0000 Methyl Di-ethanol Amine (MDEA) based Gas Sweetening Process is an established process for treatment of sour gases to meet pipeline specifications with regards to H2S contents. One of the Gas Sweeting Unit (GSU) has been designed with generic MDEA solvent to selectively remove H2S along with 32% Co-absorption of CO2. It was observed that because of higher receipt of sour gas, all GSU trains were operating with higher feed gas throughput resulting in higher H2S content in sweet gas & higher quantity of acid gas generation. A detailed study was carried out to explore the possibilities for maintaining sweet gas quality with increased sour gas throughput.\u0000 Detailed simulation studies on \"HYSYS\" process simulator revealed, that using generic MDEA it was difficult to increase the operating capacity of the GSU while maintaining H2S content in sweet gas & acid gas quantity generation within acceptable limits. Hence opportunities for speciality amines were explored.\u0000 Case studies revealed successful use of specialty amines for capacity enhancement and improved performance in the existing system. With the targeted sweet gas quality, the capacity can be enhanced up to 30% with minor modifications in the existing set up. This also resulted in significant reduction in consumption of utilities like steam, power and cooling water.","PeriodicalId":105730,"journal":{"name":"Day 2 Wed, March 27, 2019","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128447084","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":"A New Multiple Chelating Acid System with Low Damage and Weak Dissolution","authors":"Nianyin Li, Ming Yang, Qian Zhang, Hongyu Zhou, Changjin Zhai, Lei Feng","doi":"10.2523/IPTC-19324-MS","DOIUrl":"https://doi.org/10.2523/IPTC-19324-MS","url":null,"abstract":"\u0000 Matrix acidizing is an essential strategy to maintain or increase productivity or injectivity of hydro-carbon wells. However, for loose sandstone reservoirs, the rock skeleton structure is easily de-stroyed by acidizing with conventional acid systems, which results in sand production. Also, the precipitation of metal fluorides, fluorosilicates, and so forth that may occur during acidizing will cause secondary damage to reservoirs. Therefore, we propose a new multiple chelating acid system (NMCAS) with low damage and weak dissolution. The system consists of multiple weak acids, organic phosphonic chelators, anionic polycarboxylic chelating dispersants, fluorides, and other auxiliary additives. Its performance was measured through laboratory tests. First, the dissolution retardation effect and dissolution capacity of NMCAS were analyzed by long-term dissolution tests. Then, the changes of particle size and mineral composition of the rock powder before and after dissolution of NMCAS and a regular mud acid system were comparatively analyzed by a sieving analysis method and x-ray diffraction measurement. Third, the chelating abilities of the system on metal ions were analyzed by a titration method. Moreover, the improvement of seepage capacity was analyzed by a core acidification flowing experiment and scanning electron microscopy. Finally, the dissolution mechanism of the system was further analyzed by energy dispersive spectroscopy. Research results indicate that NMCAS has a good retardation effect and a moderate dissolution ability. After dissolution of rock powder with the proposed acid system, the changes in particle size were less than those of the conventional mud acid system. Also, it dissolved merely a small portion of the clay minerals, but increased the dissolution of quartz, feldspar, and other matrices. NMCAS can prevent secondary precipitation of metal ions during the acidizing process because of its strong chelating ability for calcium ions, magnesium ions, and iron ions. The permeability of sample cores was moderately increased, and they formed obvious dissolution channels; however, the rock skele-ton structure was not destroyed after acidizing with NMCAS. This is because the system reduced the dissolution of clay minerals with larger specific surfaces because of the adsorption effect (a relatively lower reduction in the content of the Al element) while enhancing that of such matrices as quartz and feldspar (relatively larger changes in the content of the Si element). NMCAS can dis-solve the cement appropriately while enhancing the dissolution of the matrices, which protects the rock skeleton structure of loose sandstone reservoirs. The proposed acid solution would be of value for removing formation plugging and increasing the production of loose sandstone reservoirs.","PeriodicalId":105730,"journal":{"name":"Day 2 Wed, March 27, 2019","volume":"801 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133752405","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":"Economic Analysis of Lost Circulation Events to Optimize the Drilling Process in Basra Oil Fields, Iraq","authors":"H. Alkinani, A. T. Al-Hameedi, S. Dunn-Norman, R. Flori, M. Alsaba, A. Amer, W. Al-Bazzaz","doi":"10.2523/IPTC-19290-MS","DOIUrl":"https://doi.org/10.2523/IPTC-19290-MS","url":null,"abstract":"\u0000 Lost circulation is a unique challenge unlike other factors contributing to non-productive time (NPT). Due to the variability in the nature and type of lost circulation prone formations; there is no universal solution to this challenge. This publication presents a new approach to guide the decision-making process of which and when to apply a certain treatment as compared to another. If implemented correctly, a significant reduction in NPT related to lost circulation can be expected. Also, the cost of each treatment, as well as the NPT that is associated with the treatment, were examined in this study. Lost circulation events for three formations which are the Dammam, Hartha, and Shuaiba were gathered from over 1000 wells drilled in Basra oil fields, Iraq using various sources and reports; the treatments were classified by scenario –partial, severe, and complete losses – as well as cost, efficiency, and formation types. This paper is developed based on probabilities, expected monetary value (EMV), and decision tree analysis (DTA) to recommend the best-lost circulation strategy for each type of losses.\u0000 This paper utilizes probability and economics in the decision-making process. This is the first study that considers a detailed probability and cost to treat the lost circulation problem. Thousands of treatment scenarios for each type of losses are conducted, and the EMVs for all scenarios are calculated. For each type of losses, the lowest EMV treatment strategy- that is practically applicable in the field and makes sense- is selected to be used to treat each type of losses to minimize NPT and cost. If the losses didn't stop after utilizing the proposed treatment strategies, it is recommended to use liner hanger to isolate the losses zone and then continue drilling. A change in well design is also suggested to help to minimize NPT and cost. In addition, a formalized methodology for responding to losses in the Dammam, Hartha, and Shuaiba formations is established and provided as means of assisting drilling personnel to work through the lost circulation problem in a systematic way.\u0000 One challenge in drilling wells in Basra oil fields is the inconsistency of approaches to the lost circulation problem. Therefore, the result of this data analysis provides a path forward for the Basra area lost circulation events and suggests probable methods that can be used in similar formations globally. Additionally, the methodology can be adapted to studying other types of formations and drilling challenges have the same geological properties in any major oil field.","PeriodicalId":105730,"journal":{"name":"Day 2 Wed, March 27, 2019","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134458405","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}