Day 4 Thu, November 15, 2018最新文献

{"title":"New Technology to Assist Drilling to Improve Drilling Rate in Unconventional Gas Resources: Pulsed Arc Plasma Shockwave Technology","authors":"Zhixiang Cai, Hui Zhang, Jun Li, Jiadong Zheng, Qing Yu, Kerou Liu, Yongsheng Liu","doi":"10.2118/193279-MS","DOIUrl":"https://doi.org/10.2118/193279-MS","url":null,"abstract":"\u0000 The rate of penetration is very low during the development of unconventional gas resources such as tight gas and marine shale gas, owing to high rock hardness and strength as well as heterogeneities at all scales. To improve the efficiency and reduce costs of developing unconventional gas resources, this paper proposed a new technology to assist drilling, Pulsed Arc Plasma Shockwave Technology (PAPST).\u0000 This technology converts electrical energy into mechanical energy to generate dynamic loads shockwave which can assist rock-breaking. Firstly, based on the fluid mechanics and bubble dynamics, the mechanism of shockwave generation was analyzed. Then, to verify the feasibility of PAPST technology, this paper conducted rock breaking experiment with shale samples from Longmaxi formation, China. Meanwhile, based on impact and damage mechanics, the mechanism of rock damage caused by dynamic load was analyzed.\u0000 The results show that shale samples were destroyed and there were cracks and collapse pits on shale samples after the impact of shockwave. Therefore, the application of PAPST technology to assist drilling is feasible, and the greater the discharge energy, the higher the efficiency of rock failure. Through theoretical analysis, it is found that the radial cracks of rock are caused by the tangential tensile stress, which is caused by the shockwave impacting the rock. The secant cracks are caused by the resultant force of the three component forces: the tangential and radial components of the force on the rock particle caused by the shockwave and the radial tensile force generated by the reflection of stress wave at the rock-water interface. The collapse pits are most likely caused by stress concentration.\u0000 For the first time, this paper proposed an idea of applying shockwave generated by PAPST to assist drilling for increasing the ROP in unconventional gas resources. And it also provided a theoretical basis for the application of PAPST in the field of oil drilling by analyzing the mechanism of shockwave generation in drilling fluids and the mechanism of rock breaking by shockwave.","PeriodicalId":11079,"journal":{"name":"Day 4 Thu, November 15, 2018","volume":"157 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73738217","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":"Feasibility Analysis and Field Application of Waste Oily Sludge Resource Utilization Technology in Oilfield","authors":"Yao Wang, Wang Siwen, Rui Li, Hao Wang","doi":"10.2118/192895-MS","DOIUrl":"https://doi.org/10.2118/192895-MS","url":null,"abstract":"\u0000 Oily sludge is one of the main wastes produced during oilfield development. The composition of oily sludge is complex, resulting in difficult separation and high processing cost. The existing technologies such as landfill, microbiological deterioration, heat treatment and solvent extraction are difficult to meet the needs of oily sludge treatment. It is necessary to develop a highly efficient and cheap reutilization technology for oily sludge. For this reason, we have proposed to recycle the oily sludge which can be utilized to profile control in water injection and thermal recovery wells.\u0000 In the process of research, we have developed five aspects of work: First, three-phase separation of oily sludge was carried out by distillation, and water quality, oil-phase composition and solid particle size were analyzed. The compatibility of oily sludge and oil reservoir was investigated. Second, the mechanism and influence factors of the oily sludge for profile control were studied by long core model test and microscope observation. Third, suspension analysis and mobility analysis were developed on oily sludge, and experimental results were used to research oily sludge profile control agent. Fourth, numerical simulation was used to optimize the engineering design of Oily Sludge Profile Control (OSPC). Fifth, ground process flow of oily sludge for profile control was designed.\u0000 The following conclusion can be drawn from the study: OSPC is a Reutilization Technology for oily sludge, which could seal up oily sludge in-situ in oil reservoir and be favorable for increasing production of oil wells through profile control. Through the rheology and plugging test, it was clear that OSPC could greatly reduce the pollution risk of oily sludge and the ground treatment cost, and solid phase and oil phase of mud were retained in the formation. It could plug high permeability channels and high permeability area (the plugging rate was more than 90%) to adjust water/steam injection profile of water/thermal recovery wells. Profile control agent, engineering design method and ground process flow for oily sludge were developed. The technology applied 72 wells in the oilfield, 184 thousand tons of oily sludge were used in total, production of crude oil was increased by 84 thousand barrels, and a lot of sludge treatment costs could be saved.","PeriodicalId":11079,"journal":{"name":"Day 4 Thu, November 15, 2018","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74026775","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":"Water Treatment Challenges to Meet BFW Spec Using Reject Streams from Municipality Sewage Plant - Kuwait","authors":"C. Kuijvenhoven, R. Ghouti, M. Alenezi, R. A. Al Rasheedi","doi":"10.2118/192797-MS","DOIUrl":"https://doi.org/10.2118/192797-MS","url":null,"abstract":"\u0000 Water from the reject stream of the Reverse Osmosis (RO) units in Sulaibiya Waste Water Treatment plant (SWWTP) will be used as source water for the Once-Through Steam Generators (OTSG) for the South Ratqa (SR) Phase I project. Using sewage water as source water for steam boilers directly impacts the complexity of the water treatment processes.\u0000 Based on the South Raqa steam quality specifications, a water quality requirement has been defined which was found in line with international guidelines. For one of the quality requirements specified (Chemical Oxygen Demand) a tight specification of < 0.1 mg/l was set, which is not often seen in the industry. Instead the industry does define Total Organic Carbon (TOC) as water quality specification, which is closely related to COD. As the water source in the Sulaibiya is coming from a sewage plant (unknown organic components), COD was included as water quality specification.\u0000 To deliver the required BFW quality, seven different treatment steps are being installed, which all need to be optimised to ensure the required high plant availability. The major risk area is the requirement to achieve residual chlorine in the water stream coming from the Sulaibiya plant.","PeriodicalId":11079,"journal":{"name":"Day 4 Thu, November 15, 2018","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84193559","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":"Improved Decision Making for Coiled Tubing Well Intervention With Downhole Video Camera DVC","authors":"S. Hamid, A. K. Al-Mulhim, Abdullah A. Al-Ghamdi, V. Unnikrishnan, U. Ahmed","doi":"10.2118/192695-MS","DOIUrl":"https://doi.org/10.2118/192695-MS","url":null,"abstract":"\u0000 Conventional Coiled tubing well intervention has been carried out in oil and gas wells for more than 30 years with not real-time data acquisition. With the advent of Coiled Tubing Telemetry (CTT) e-line/fiber optics/mono conductors in coiled tubing industry, a wide variety of opportunities has become available - downhole video camera (DVC) being one of them, to go beyond the conventional parameters and optimize the well intervention operation.\u0000 DVC is used in the oil and gas industry with high success rate reported by several operating companies and service companies around the world. Video cameras have mostly been deployed using e-line; however, Coiled tubing camera runs provide the ability to clean the wellbore (by pumping fresh water or solvent) for capturing clearer, crisper videos and images.\u0000 As the oil and gas industry is moving towards improving operating efficiency, minimizing the coiled tubing runs based on actual downhole data is of utmost importance. Therefore, having the ability to inspect downhole obstructions using the video camera, and to observe the downhole conditions is phenomenal.\u0000 In this paper, the well intervention performed on multiple oil and gas wells in Middle East shall be discussed. Whenever an obstruction is encountered in the well bore, the primary form of detecting it is to run a lead impression block (LIB) on slickline or e-line. In most cases the LIB results do not provide a clear indication of the anomaly or obstruction. Not only that it sometimes adds to further confusion leading to inappropriate job design and planning, which results in potential misruns, inaccurate tool selection resulting in extensive and costly operations.\u0000 This paper aims to highlight the unique integration of DVC and telecoil application to enhance the reliability of data acquisition and job success. The custom designed downhole camera shroud, along with the robust CTT system is deployed in each of the candidate wells. The camera chosen is designed to withstand the maximum anticipated downhole temperature.\u0000 All the camera runs were analyzed and the obstruction in the wells was determined, which enabled the team of engineers to decide on the appropriate real-time course of action to gain access into the well bore or detect functionality of downhole jewelry.","PeriodicalId":11079,"journal":{"name":"Day 4 Thu, November 15, 2018","volume":"49 3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89726690","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":"New Techniques Developed to Safely Unload and Test High Rate Offshore Sour Gas Well With 7-in Monobore Completions-Lessons Learned Gas Wells Offshore Sarawak Malaysia","authors":"Azraii Fikrie Azraii, A. Adhi, Thian Hui Chie Hui Chie, C. Claire, Ridzuan Shaedin Ridzuan, C. H. Roh, M. Z. M. Zarir, Firdaus Firdaus","doi":"10.2118/192815-MS","DOIUrl":"https://doi.org/10.2118/192815-MS","url":null,"abstract":"\u0000 Sarawak, Malaysia first offshore high rate dry gas field has an over pressured reservoir. Successful pressure control during drilling required the use of barite in the water based drilling mud in PMCD mode inside carbonate. Barite is very abrasive and is insoluble in any acid or solvent. Any barite left in the reservoir due to mud losses has to be produced back to surface after completing the wells. This cleanup is crucial for the safety and longevity of permanent facilities, especially when high rate gas wells are involved; due to the high rate of impact of any solids that may be produced with the gas. It is also critical to design the cleanup job carefully to ensure proper equipment and safety measures are taken to avoid washouts and related safety hazards.\u0000 To ensure solids free production from day one, a procedure was implemented and successfully executed during the development of this first offshore high rate high-pressure sour gas field. This was achieved by using the tender rig as a main support and complementing the safety with the incorporation of the selected well testing equipment management system. In addition to the proper equipment, a detailed cleanup procedure, which covered systematic production ramp up and defined solids free criteria, was implemented from well owner or asset. So far, this well cleanup setup and program has been implemented on several wells on platforms with minor erosion and no safety issues.\u0000 One platform with several wells is already producing and is flowing trouble free. This paper will describe the details of the setup of the rig facilities to clean these barite fluids from the wells, and the solids control equipment used and the cleanup procedure.","PeriodicalId":11079,"journal":{"name":"Day 4 Thu, November 15, 2018","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89614763","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":"Targeting the Permo-Triassic Tight Gas in the Khuff: Lessons Learned in the Journey towards Development, Offshore Abu Dhabi, UAE","authors":"S. Steiner, Suvodip Dasgupta, M. Basioni, F. A. Aryani, A. Noufal, C. Mills, J. Mandl, Pradeep Menon, I. Raina, L. Mosse, S. Shasmal, F. Hollaender, Humair Ali, Baraka Al Afeefi, Neil Sookram","doi":"10.2118/192809-MS","DOIUrl":"https://doi.org/10.2118/192809-MS","url":null,"abstract":"\u0000 Exploration drilling for gas potential in Khuff Formation started more than 40 years ago and wells across multiple assets in offshore Abu Dhabi showed the presence of sizeable reserves. With increasing recent importance on gas production, there is a plan for moving towards development for those Permian tight gas structures to address the nation's gas needs. This paper will try to address the lessons learned from the recent appraisal wells in Khuff, the uncertainties and the success criteria.\u0000 There have been multiple wells drilled through the Khuff Formation in Offshore UAE in the last two years and have yielded a wealth of information from downhole well logs, mud logs, well test results and core data. The downhole logs acquired in these wells ranged from basic triple-combo and mud logs to image and dipole sonic logs, along with formation testing and sampling measurements, followed by well tests across the zones of interest. Interpretation of all these data have revealed some interesting lessons learned.\u0000 The shallow marine sequence of the Khuff Formation is generally characterized by poor porosity and low matrix permeability; however, the diagenetic overprint has resulted in a significant heterogeneity development, which controls the present-day porosity and permeability development at the wells. The well test results show variations in terms of 2 or 3 orders of magnitude at the same interval, which highlights potentially problematic development strategies. We have observed significant differences in terms of lithology, porosity and other reservoir quality indicators between wells, located a kilometre apart. Optimization of logging suite to minimize petrophysical evaluation uncertainty will be discussed. Characterising this heterogeneity is key for future economic success of this play. Possible role of fractures influencing flow from the Khuff have been discussed in older publications, however no conclusions were arrived at, with certainty. Presence of fractures and faults beyond the immediate vicinity of the well might be something to look at, in terms of understanding the potential productivity of those intervals. A big step for developing Khuff Formation might be in terms of deciding the optimal stimulation strategy and this is something, which remains to be studied extensively in UAE.\u0000 Closing the loop of interpretation of the acquired logs with the final well-test results and production logs gives us the advantage of hindsight and helps us in separating out the key productivity indicators as well as bring out the uncertainties in formation evaluation, which affect these tight gas reservoirs.","PeriodicalId":11079,"journal":{"name":"Day 4 Thu, November 15, 2018","volume":"122 2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89405388","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":"Successfully Deploying & Retrieving 6,200ft of Perforating Guns Over Six Challenging HPHT Wells","authors":"Bathmanaaban Gopalan, S. Craig, See Yung Jonathan Chong, Cherif Bouzaine, P. Pouget","doi":"10.2118/192933-MS","DOIUrl":"https://doi.org/10.2118/192933-MS","url":null,"abstract":"\u0000 A six wells campaign to single-run perforate long completion intervals was undertaken in Brunei. The offshore field presented inherent challenges due to high pressure, temperature and long perforating intervals. A major challenge was to perforate underbalance to reduce potential permanent formation damage. The solution proposed for this high pressure and high temperature (HPHT) perforation was to use a high grade of coiled tubing (CT) with live-well gun deployment and retrieval system. The live-well gun deployment system utilizes perforating connections designed to support the gun weight, firing shock loads and ballistic transfer. The connection and break-out are facilitated via specialized rams in a dedicated BOP body in live well conditions. A 130-ksi yield strength CT string was engineered to withstand high tensile forces from running up to 1,150-ft of guns to depths of 18,000-ft in near vertical wells and provide a suitable safety margin when high collapse pressures were present. However, when perforating with long gun lengths, high dynamic shock loads will be experienced by the CT string. Thus, for all the wells, two software systems were used, traditional CT force analysis program and a gun force software for the short duration transients present during perforating. There were numerous continual improvements implemented during the duration of the campaign and one of them was maximizing the underbalance perforation up to 5,500-psi. Although such high underbalance was not a standard practice in the industry with CT, it was carried out after a comprehensive study and review to perform the operation safely and efficiently. There were no recordable safety issue throughout the two years campaign where more than 6,230-ft of guns were ran and live-well reverse deployed. The campaign was successful and operator expectations met. This paper outlines the characteristics of this campaign from the planning stage up to operational execution and efficiencies recorded over the six wells campaign. Well control mitigation practices and general contingencies will be detailed. This paper will act as a suitable reference for future operations.","PeriodicalId":11079,"journal":{"name":"Day 4 Thu, November 15, 2018","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77862761","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":"Managing Human Barriers through Operating Integrity Management","authors":"Hemant Kumar Balakrishnan","doi":"10.2118/193033-MS","DOIUrl":"https://doi.org/10.2118/193033-MS","url":null,"abstract":"\u0000 ADNOC Gas Processing, one of the world’s largest gas processing companies, operates 5 large sites (includes 26 processing trains and an NGL distillation complex at Ruwais) and manages 3000+ kilometre pipeline distribution network which has a capacity of 8 billion standard cubic feet of gas per day. Both the country’s electricity and water supplies are dependent on ADNOC Gas Processing’s continuous operation and the safety of people working on or near their assets is dependent on their safe operation.\u0000 The ADNOC Health Safety and Environment (HSE) Code of Practice (COP) requires that ADNOC Gas Processing implements a systematic approach to HSE which is consistent with the ADNOC HSE Management System. Therefore the ADNOC Gas Processing HSE Management Manual (HSEMM) serves as the ADNOC Gas Processing HSE Management System (HSEMS) and describes expectations in line with the ADNOC COP and provides an overview of how these expectations are met.\u0000 In addition to ADNOC CoP Requirements, Process Safety Expectations from ADNOC Gas Processing’s Process Safety Management Standard are included in the ADNOC Gas Processing HSE Management Manual (HSEMM).","PeriodicalId":11079,"journal":{"name":"Day 4 Thu, November 15, 2018","volume":"77 1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77663778","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":"Pushing the Limits of Coiled Tubing to Address the Challenges of Matrix Stimulation in Multi-Lateral Extended Reach Power Water Injector","authors":"H. Jassem, Naji K. Salman, R. Said, D. Ahmed, Kaisar Al Hamwi","doi":"10.2118/192637-MS","DOIUrl":"https://doi.org/10.2118/192637-MS","url":null,"abstract":"\u0000 In Middle East carbonate reservoirs, power water injector (PWI) wells are typically completed with long openhole laterals. The reservoir contact provides pressure support and enhances sweep efficiency in the low-transmissibility reservoirs. Due to the wells deviation and length, coiled tubing (CT) interventions are required to successfully enter and identify each lateral, as well as to remove formation damage by pumping the matrix stimulation treatment across entire laterals.\u0000 During such CT interventions, laterals are accessed thanks to a hydraulically operated lateral identification tool (LIT), while the stimulation treatment is pumped through a ball-drop-activated high-pressure jetting nozzle (HPJN). LIT and HPJN are efficiently operated by monitoring downhole pressure values both inside and outside of the bottomhole assembly, in real time thanks to CT fiber-optic telemetry. Those downhole pressure readings further assist in optimizing the pumping rate during the job, while keeping it below the fracturing pressure. Finally, the telemetry provides support for gamma ray (GR) logging, which facilitates depth control and lateral identification.\u0000 This study features a case history during which the matrix stimulation treatment was conducted in two separate CT runs for both laterals of the well. For the first run, the CT initially entered L-0 following the natural path of the well, whereas L-1 was accessed by activating the LIT. Correct lateral entry was confirmed by matching the acquired GR readings with reference logs. After successfully accessing L-1 and reaching its maximum depth, a ¾-in. ball was dropped to isolate the LIT and activate the HPJN for stimulation.\u0000 During the second run, as the CT entered L-0, GR monitoring was used to confirm lateral accessibility. The stimulation treatment was pumped after reaching maximum depth and isolating the HPJN. During the stimulation of each lateral, 20% viscoelastic diverting acid was utilized for diverting from high-intake zones and 20% HCl to stimulate damaged/tight zones.\u0000 This operation illustrates how downhole pressure gauge readings are used to sequentially operate the LIT efficiently and activate the HPJN, as well as to pump the matrix stimulation treatment below the fracturing pressure. Real-time GR readings, meanwhile, are used for depth control and to correctly identify laterals.","PeriodicalId":11079,"journal":{"name":"Day 4 Thu, November 15, 2018","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77846331","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 Comprehensive Study of Wellbore Stability in Laminated Carbonate Rocks by Nuclear Magnetic Resonance Experiments","authors":"H. Kesserwan, Ji Guodong","doi":"10.2118/192871-MS","DOIUrl":"https://doi.org/10.2118/192871-MS","url":null,"abstract":"\u0000 To counter the consequences of the wellbore instability problems, a thorough analysis of the borehole conditions is performed throughout the entire life-cycle of a hydrocarbon well from planning during the early stages to completion and production. The analysis comprises the following: first, a rigorous understanding of the rock properties e.g. geochemistry and geomechanics mainly the stress magnitudes and rock strength. Second, the mud properties and the entailed interactions with the formation. For instance, numerous borehole failures in laminated rocks have been attributed to the interaction of the drilling/fracturing fluid with the layered-matrix e.g. interaction of water-based-mud with reactive clay minerals.\u0000 This paper focuses on the impacts of the pore fluids redistribution on wellbore stability in organic rich carbonate rocks. The experimental method consisted of measuring the Nuclear-Magnetic-Resonance transverse relaxation time (NMR T2) on samples saturated by spontaneous imbibition of oil and brine. The wellbore stability was investigated by analyzing the changes in the NMR T2 distribution of each sample after imbibition sequences. The obtained results demonstrated the elevated impacts the wettability and pore structure characteristics on the spatial distribution of the fluids in these rocks. The type of clay content in the bedding planes and its consequent interaction with the drilling mud was identified as a potential driver of the rock instability problems. The discrepancies in the wetting traits were magnified by the presence of fractures that enhanced the network connectivity of both hydrophobic and hydrophilic pores or even across them. Furthermore, the fractures allowed the fluids to surpass the vertical bedding planes and thus accelerating the fluid distribution processes inside the pore space.","PeriodicalId":11079,"journal":{"name":"Day 4 Thu, November 15, 2018","volume":"119 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73701678","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}