Day 3 Wed, August 02, 2023最新文献

{"title":"Sensitivity Analysis of Choke Size Selections on Reservoir Pressure Drawdown Using Prosper Modelling for Reservoir Management","authors":"A. Gidado, A. Adeniyi, B. Olusola, A. Giwa","doi":"10.2118/217146-ms","DOIUrl":"https://doi.org/10.2118/217146-ms","url":null,"abstract":"\u0000 It is important to know that analysis and selection of choke sizes for oil wells is imperative for production optimizations in reservoir management. Chokes are necessary in every wellhead completion for regulating flow from the reservoir. Random selection of choke sizes has been a bad practice. For the case study of this work, productions from 3 gas condensate wells have declined with pressure over three years. The initial reservoir pressures of 5870 psi, 4373 psi and 2248 psi, initial production rates ranging from 82.3 BOPD to 242.57 BOPD and 3.018 MMSCFD to 5.001 MMSCFD respectively, with choke sizes ranging from 22/64\" to 24/64\". However, these reservoir pressures have depleted over 3 years by about 100 psi to 3800 psi for each well with early water breakthrough ranging from 10% to 25% basic sediment and water (BS&W). No analysis of choke sizes selection to flow the wells at the initial stage. This research work has been carried out on pressure depletion control corresponding with its drawdown. This was achieved by modelling and simulating PVT data, completion data, IPR and VLP data and well-test data as well as sensitivity analysis with the aid of PROSPER. Results obtained indicated the need to reduce choke sizes, thereby reducing the drawdown. The reduction of choke size gave a decrease in production volume ranging from 15 to 59% for both oil and gas. However, the reduction in choke sizes also gave decrease in water production of about 92%, 100% and 22% for the respective wells. The choke size sensitivity analysis showed that continuation of the initial choke sizes on 24/64\" gave a higher drawdown value above 100 psi, which increased the pull of water conning. Recommendation of the new choke sizes within 18/64\" to 20/64\" showed the drawdown of 79 psi, 71.5 psi and 80.5 psi. New choke size selection was recommended for the reservoir management of each well.","PeriodicalId":407977,"journal":{"name":"Day 3 Wed, August 02, 2023","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124055668","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":"Optimizing the Take-Off Valve Opening of a Self-Lift By-Pass Conduit: A Novel Approach to Severe Slugging Mitigation in Offshore Pipeline-Riser Systems","authors":"N. Okereke, F. Kara, Marcel Iloani, Christian Okalla, A. Kerunwa, I. Ogazi, Emmanuel Elendu, Chijioke Mcphilemon, S. Udeagbara, N. Nwogu, C. C. Nwanwe","doi":"10.2118/217202-ms","DOIUrl":"https://doi.org/10.2118/217202-ms","url":null,"abstract":"\u0000 Previous numerical simulation studies, suggests that active optimization of the take-off valve on a by-pass pipe connected to a pipeline-riser system, is critical to the effective deployment of the self-lift severe slugging mitigation technique. Hence, there are recommendations for further experimental studies on the effective deployment of the self-lift severe slugging mitigation approach. Generally, severe slugging has adverse effect on multiphase flow transportation along the pipeline-riser system, with a potential 50% drop in production.\u0000 Industry mostly relies on gas-lift, topsides choking and aggregation of high pressure wells as a means to manage severe slugging for typical deepwater oil fields. However, these methods have key disadvantages such as high volume of gas required for compression to mitigate severe slugging via gas-lift and the drop in production associated with topsides choking as a result of topsides choking being mainly effective at low valve opening.\u0000 This study investigated the deployment of self-lift severe slugging mitigation technique via a 4 feet × 7 feet pipeline-riser section, consisting of a 2 inches by-pass pipe diameter, with the take-off valve designed to operate in such a manner as to tap-off associated gas via the valve and injected via the injection valve until it is able to break liquid slugs within the riser column.\u0000 The results obtained from this experimental study indicated that severe slugging was better mitigated at between 50% - 70% valve opening of the take-off valve, while the injection valve was set at 50% valve opening, to compress air flowing as part of associated gas increased by 20%. Mitigation of severe slugging was observed with flow stabilization of the intermittent fluctuation at the outlet nozzle at the topsides of the riser section, which was set at about 30% opening. The results further revealed that self-lift could be adapted to mitigate slugging in a pipeline-riser section and also possibly deployed offshore.","PeriodicalId":407977,"journal":{"name":"Day 3 Wed, August 02, 2023","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122756540","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":"Evaluating the Potential of Renewable Energy to Address Energy Accessibility, Affordability, and Sustainability Challenges in Africa","authors":"M. C. Ezeh, T. H. Fidel-Anekwe, P. B. Ikpabi","doi":"10.2118/217214-ms","DOIUrl":"https://doi.org/10.2118/217214-ms","url":null,"abstract":"\u0000 Energy accessibility, affordability, and sustainability are crucial factors for developing any country, particularly in Africa. The numerous challenges most African population face in providing reliable and affordable energy to their communities hinder economic and social development.\u0000 This study evaluates the potential of renewable energy to address energy accessibility, affordability, and sustainability challenges in African countries. To do this, the study involves a review of successful renewable energy projects in Africa and an analysis of energy consumption and production data. Several key factors are considered in this analysis. Firstly, this study examines the feasibility of different renewable energy technologies in African contexts. This includes an assessment of the potential for solar and wind power to provide reliable energy, as well as an examination of other renewable energy options. Secondly, the study considers the economic and financial implications of renewable energy adoption. This includes analyzing the costs and benefits of different renewable energy technologies, including examining the financing and investment requirements for renewable energy projects.\u0000 Finally, this study assesses renewable energy's social and environmental impacts in Africa. This includes an evaluation of the potential for renewable energy to improve energy access in disadvantaged communities and examining the environmental benefits of renewable energy. By examining successful renewable energy projects and analyzing energy consumption and production data, this study provides strategic recommendations on how African countries can adopt renewable energy technologies to enhance their energy systems and transition to cleaner energy sources.","PeriodicalId":407977,"journal":{"name":"Day 3 Wed, August 02, 2023","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130839914","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":"Improving Well Construction/Intervention Time and Cost Estimation Accuracy Via Historical Performance Data Analysis","authors":"Mirian Kosi Orji, Toyin Arowosafe, John Agiaye","doi":"10.2118/217196-ms","DOIUrl":"https://doi.org/10.2118/217196-ms","url":null,"abstract":"\u0000 Time and cost estimation and the accuracy of it, are central to engineering design and forms the basis for economic analysis of projects. There are several factors that could result in cost or schedule overruns ranging from unplanned non-productive time, inefficiencies, changes in macro indices etcetera; however, one often overlooked factor is deficient time and cost estimation. Hence in addition to factoring prevailing market and contract rates for materials and services, it is important to critically analyze and benchmark plans against known performance for higher accuracy around estimations.\u0000 Well project time and cost models generally consist of estimating in modules or sub-phases and aggregating these modules to makeup the total. This can either result in a single discrete estimate or in ranges based on probability and statistical performance - inherently implying that some form of historic performance is crucial to the estimation accuracy. This paper describes a structured approach to developing a probabilistic estimation tool by analyzing past performance data at a phase or subphase level. This tool can be domiciled on a range of computation platforms using similar methodology, which comprises data collection from execution reports, data cleanup and organization to harmonize terminologies and group operation types, and finally statistical and mathematical data analysis. Statistical analysis develops probabilistic relationships in the dataset and correlation between performance variables such as depth and time; while mathematical analysis incorporates numerical correlations and multiple variables to generate estimates in modules and finally aggregates the discrete phase estimates.\u0000 The estimation has two major components – Time and Cost.\u0000 The analysis of time component considers the productive and non-productive time by phase; determines depth dependent operations and their correlation to time and assigns a mathematical function to each phase The cost component is broken down into two sub-components – recurrent cost which is highly time-dependent and non-recurrent (material and services) cost which are usually based on pre-defined contractual rates An additional end function is benchmarking, for comparison between estimates and historic performance\u0000 The aggregate of the probabilistic estimate of each module gives the total estimate of time and cost for a given well construction or intervention scope, with the overall objective of improving and maintaining estimation accuracy to avoid overruns and over-estimation of drilling, completions, workover and intervention projects.","PeriodicalId":407977,"journal":{"name":"Day 3 Wed, August 02, 2023","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126073789","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}