Major challenges in hpht operations linkedin slideshare. High temperature, high pressure completion challenges. Sinificant faulting can be seen, as can the well locations ranging from ew1, ec2, ew3, ec3, ee2, ec5 and ec5. Research and application of micronized barite drilling fluid. Hpht high pressure high temperature wells have a downhole environment of more than 10,000psi 690 bar andor 300 deg f 140 deg c. After this course, those involved with hpht wells will be able to find concrete solutions to several problems preventing efficient hpht well operation. Available equipment manufactured suitable for hphtbrian hart, cameron closedloop cementing on hpht wellsdon hannegan. Charting a course for a reliable future in high pressure high temperature wells since 1960. A good example of an advanced extreme hthp automated well control software is safekicks safevision well control package, whch was developed to provide benefits during conventional well control operations, but its features may also help to manage extreme hpht wells. Another technical drilling challenge shell has been encountering when drilling its deeper wells has been preserving wellbore sizes large enough to accommodate the planned. All schlumberger case studies, product and technical data sheets, articles, interviews, animations, and more.
Pdf high strength low alloy steel for hpht wells researchgate. Major challenges in hpht operations survey results of a survey sent to hpht professionals 16 november 2010 hpht wells summit. The approach includes theoretical evaluations, computer simulations with advanced modeling tools, laboratory studies, well control training as well as implementation of learnings in procedures and operations. Well temperature control involves controlling the temperature of the drilling fluid at surface and delivering the cooled fluid downhole. The growing need f or oil and gas t hroughout t he world is driving the explorat ion and production i ndustry to. Tier iii encompasses extreme hpht wells, with reservoir pressures from 30,000 psi to 40,000 psi and or temperatures between 500f to 600f. Drill cool systems is an integral member of the well design team. International association of drilling contractors north. Students will learn about well planning processes, the drilling and geological challenges presented by hpht wells and explore pore pressure detection processes, rock fracture pressure and ecd requirements and well control procedures. The term hpht may be applied to wells that have only high pressure or high temperaturefew wells have both characteristicsbut regardless of the designation, hpht wells offer specific challenges that must be addressed if operations are to be successful. Applications of realtime chemical stratigraphy in support of the safe. However, most of the rules for design in division 3 are. What is ultrahigh pressure, high temperature oil and gas. In the uk, hpht is formally defined as a well having an undisturbed bottomhole temperature of greater than 300of 149oc and a pore pressure of at least 0.
The older pre 2007 division 2 rules used linear elastic design methods, which may not be appropriate for hpht equipment that may undergo significant plastic deformation in areas of local stress concentrations. Whether operating in the north sea or a north american shale play, high temperature, high pressure hthp wells present unique challenges to oil and service companies. Ultra hpht wells are challenging the limits of tubular performance, in terms of metallurgy and threaded connections. Oct 26, 2015 hpht high pressure high temperature wells have a downhole environment of more than 10,000psi 690 bar andor 300 deg f 140 deg c. Hpht wells present specific challenges, including all aspects of well construction and production, and they require. Consequently, drillers must predict the pore pressure before drilling into a formation. As offshore oil and gas exploration and development advances in relation to both deeper water depth and deeper wells, the operating environment becomes more extreme especially in terms. Hpht 101what petroleum engineers and geoscientists should. This paper presents an integrated approach on hpht well control in narrow pressure margin wells. Content of petrowiki is intended for personal use only and to supplement, not replace, engineering judgment. The best common ways to manage barite sag in hpht and. The older pre 2007 division 2 rules used linear elastic design methods, which may not be appropriate for hpht equipment that. Predominantly gas producers, robbie rounsaville and benoit vidick, schlumberger united kingdom ltd hthp wells may yield significant reserves dowell. Challenges and risks of hpht bp, mad dog shell, stones chevron, jack and st malo maersk, culzean petrobras, lula.
High temperature, high pressure hthp wells present unique challenges to oil and service companies. Gibsons performance is oriented drilling and well engineering professional with 34 years worldwide multi national experience. By kelli ainsworth, associate editor intelligent completion advances target improved reliability in hpht conditions, simplified deployment new technologies helping to provide realtime fluid characteristics, faster or remote actuations and optimized production over life of the well in august, halliburton released a new version. Cement slurry segregation has a detrimental impact on the cement matrix efficiency in term of zonal isolation.
The challenges created by these, make drilling and cementing in these. Santos is the current program chairperson of spe bahiasergipe section and has served or is currently serving on several spe committees. Chevron will use the pacific santa ana drillship for a dualgradient drilling campaign in the deepwater gulf of mexico. In 1949 the average depth of an oil well drilled was 3,635 ft by 2008 that was 6,000. A customized manual and course will then be prepared to cater for customer specific needs. In this study, synthetic modified phyllosilicate smp dispersant, which is.
Pertaining to wells that are hotter or higher pressure than most. To further enhance its capabilities to exploit deepwater and. If the viscosity of high density drilling fluid is too low, it. But higher pressures and temperatures are only part of the challenge. Delivering success in hpht reservoirs through experience. Major challenges in hpht operations survey results of a survey sent to hpht professionals 16 november 2010 hpht wells summit 2010. A well is considered to be high pressure and high temperature hpht if the.
Nov 16, 2010 major challenges in hpht operations 1. Dec 31, 2015 however, heavy reliance on these new technologies may run counter to the guiding principle of keeping hpht wells as simple and reliable as possible. The problem is more challenging in offshore environments. Research and application of micronized barite drilling. An experimental investigation of the the effects of ultra high pressures and temperatures on the. A dst was performed over 30ft intervals and flowed gas at an equipment restricted rate of 23 million cubic feet per day. Drilling, completion, testing and production in hpht environment are technically complex operations with very high risk and exhibits major hse issue and are further aggravated with the presence of h2s and co2. Halliburton not only has the industrys leading experts and the largest hp ht fleet, weve been developing and upgrading our hp ht capabilities for the last 50 years. In this study, synthetic modified phyllosilicate smp dispersant, which is known as laponite rd is suggested to reduce the slurry segregation and enhance the vertical homogeneity of the cement matrix in term of density distribution. Tier iii is the hpht segment with the most significant technology gaps. Nov 02, 2016 many operators such as maersk oil culzean and total solaris have opted for jackup based exploration with a dry tree.
This paper compares rheology, sag stability, and lubricity of highdensity drilling fluid weighted by micronized barite and api barite, and the corresponding mechanism is discussed. One of the deepwater wells was drilling in 5,616ft of water and was targeted at the north west edge of a seismically defined amplitude anomaly, covering an area of 68km2. Your ability to understand and manage the temperature limitations of hpht drilling operations, especially the critical safety equipment within each system, is essential to the successful and safe completion of your hpht well. To explore the challenges of drilling and evaluating hpht wells. In many aspects the technical developments and optimizations go hand in hand with the development of solutions to safety issues. Hpht wells present specific challenges, including all aspects of well construction and production, and they require operators and service companies to take approaches\nthat can be significantly different from those used in nonhpht wells. Spe 163376 hpht 101 what every engineer or geoscientist. Deepwater high pressure, high temperature hpht drilling environments present difficult challenges to well engineers. Challenges and remedy for cementing of hpht wells in. Oil consultants client approached us to provide drilling supervision and support services for the simultaneous drilling of four deepwater wells. Another technical drilling challenge shell has been encountering when drilling its deeper wells has been preserving wellbore sizes large enough to accommodate the planned evaluation and completion, according to the shell advisor drilling engineer.
Although the term was coined relatively recently, wells meeting the definition have been safely. Effect of h2s and co2 in hpht wells on tubulars and cement. Developing solutions for deepwater hpht applications. High pressure high temperature study bureau of safety. Abstract this paper presents an integrated approach on hpht well control in narrow pressure margin wells. In order to mitigate the problems associated with hpht environment it is of supreme importance that extensive planning should be done before any operation of drilling and testing or stimulation if performed. Santos is editor of the spe book drilling and production operations in hpht wells. The application of hmbf in two hpht wells with good gas show in western south china sea is introduced in detail, and to provide a reference for offshore hpht drilling. Typical deepwater pore pressure and fracture gradient. Pdf hydrogen sulfide produces embrittlement in high strength low allow hsla. Hpht well planning, engineering and operations course the hpht course is best run in collaboration and conjunction with the drilling organization who will be conducting the drilling.
Iadcspe180660ms hpht field development experience transfer. We share our extensive experience earned while operating on high pressure high temperature hpht wells all over. The elgin hpht field, uk centra graben, located approximaely 110 miles to the east of aberdeen. Nuclear energy factsheet 1 what is ultrahigh pressure, high temperature oil and gas. According to the department of energy and climate change decc,1 an ultrahigh pressure, high. Over the years drilling companies have had to go deeper into the earth to extract oil.
Thank you very much for taking your time to fill out our questionnaire. The designation of highpressure, hightemperature is given to wells that present extreme conditions to operators and service companies. To further enhance its capabilities to exploit deepwater and hpht reservoirs, bp has launched project 20k, an effort aimed at developing technology and equipment that will enable the industry to drill, complete, produce, intervene and contain deepwater reservoirs with 20,000. Pdf materials for deep oil and gas well construction. This course has been designed to help drilling engineering professionals understand the technologies, terminology, challenges, concepts, processes, and. Designer casing for deepwater hpht wells viking engineering. As current mudline suspension hanger technology does not provide a means of safely suspending hpht wells, all these wells to date cannot be reentered or tied back to existing platformbasedfpso developments. Drilling into hpht wells i s a new fronti er for the petroleum and gas industry. Ultrahpht wells are challenging the limits of tubular performance, in terms of metallurgy and threaded connections. Some wells are now drilled in more hostile downhole conditions, which include high temperature and high pressure.
He planned and managed semisubmersible, drillship, jackup, platform and land projects and proven track record of consistently delivering maximum performance, maximum safety, maximum efficiency, maximum oil, gas, condensate production and maximum profitability on. Students will learn about well planning processes, the drilling and geological challenges presented by hpht wells and. Definition high pressure high temperature hpht wells are defined within the energy institute model code of safe practice part 17 volumes 1 3 as. Spe disclaims any and all liability for your use of such content. Individual hpht well production rates in the north sea area are high in comparison with field size, hence field developments comprise few wells, often less than ten. Seven cement slurries were prepared with different. International association of drilling contractors north sea. Hpht well planning, engineering and operations course the hpht course is best run in collaboration and conjunction with the drilling organization who will be conducting the drilling of hpht wells. These conditions are increasingly encountered in many basins worldwide, as exploration and production examine deeper and hotter objectives. Dear colleagues, sensing technologies have been widely adopted in the oil and gas industry in order to monitor various processes in petroleum production, from exploration, enhanced oil recovery eor, well drilling, well completion, pigging, fracking, and refining, to decommissioning. Two of these methodologies are new to the oil and gas community and the modeling methods above a certain threshold are of greater concern. Hpht wells are amongst the most lucrative and dangerous methods of upstream fuel production heres a reminder of. In the past hpht or hthp was attributed to any condition with pressure or temperature above the atmospheric condition. Intelligent completion advances target improved reliability.
High pressure high temperature study bureau of safety and. When drilling wells in high temperature and high pressure hthp fields, the drilling fluid properties are of utmost importance. At such depths, the pressure and temperature increases significantly, wherein it is common to observe temperatures that exceed 149177c and a. High pressurehigh temperature hpht wells are those where the undisturbed bottom hole temp at prospective reservoir depth or total depth is greater than 300f or 150. Drilling, completion, testing and production in hpht environment are technically complex operations with very high risk and exhibits major hse issue and are further.
The approach includes theoretical evaluations, computer simulations with. Recently, industry has begun to design equipment for high pressure and or high temperature service using the methodologies described in apis technical report 17tr8, hpht design guidelines. Due to the brookfield viscometer manual is the equation is shear rate 1sec. This course has been designed to help drilling engineering professionals understand the technologies, terminology, challenges, concepts, processes, and equipment used to drill high pressure and high temperature oil and gas wells. Challenges and remedy for cementing of hpht wells in nigerian. I n n o v a t i v e d r i l l i n g hpht operations pose. However, the combined effects of compressibility and temperature changes possible in extreme hpht wells can create significant confusion and potential problems. He is a certified iadc wellcap plus well control instructor, has taught well control for many years. Jul 16, 2012 chevron will use the pacific santa ana drillship for a dualgradient drilling campaign in the deepwater gulf of mexico.
This paper presents the concept of using conventional oil country tubular goods octg in unconventional sizes to increase the number of available casing points in deepwater wells. Sustainability free fulltext development of a homogenous. Perspectives on drilling and completion from the field offshore technology report health and safety executive hse on. The company has used expandable tubular technology to drill its deep hpht plays. Dear colleagues, sensing technologies have been widely adopted in the oil and gas industry in order to monitor various. The term came into use upon the release of the cullen report on the piper alpha platform disaster in the uk sector of the north. Effect of h2s and co2 in hpht wells on tubulars and. Drilling and completing a well at 4,000 to 7,500foot water depths is no easy task. A well is considered to be high pressure and high temperature hpht if the pressure exceeds 15000psi 1020 bar and the temperature exceeds 300 o f 149 o c.