Spe disclaims any and all liability for your use of such content. Both ences of those involved in hthp wells and introduced. Specially designed for the course is designed for, but not limited to drilling engineers, production engineers, and completion engineers who. Hal announced today it has been awarded seven contracts for drilling and completion services for the next phase of field development of the inpexoperated ichthys project in the browse basin offshore northern australia. Relative to the deepwater operations, well pressures may approach 15,000 psi at the mudline, and, hence, 20,000psi subsea equipment is being pursued. This course identifies the areas critical to efficient, safe, and successful hpht well operations. 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.
It is also shown as a working technique in chapter 2, section, friction controlled drilling, a novel approach to drilling hpht wells underbalanced. 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. Our high temperature drilling engineers with hpht experience look beyond the simple installation of a basic mud cooler or assumed specification for flowline temperature reduction. Hpht planning and well control linkedin slideshare. As this paper is written kristin has finished drilling of 4 high angle hpht wells. Hpht wells are defined to be those where the static reservoir pressures exceeds 0 psi and temperatures are more than 300 degree. Recognizing the main differences in planningdesign between hpht and standard conventional wells, as well as the challenges that will have to be faced drilling and tripping operational challenges and practices and. 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. Challenges and remedy for cementing of hpht wells in nigerian. However, there are so many factors that need to be addressed and learned in order to safely overcome the challenges of drilling into and producing from hpht oil and gas wells. To be considered a hpht well, the downhole conditions will have pressures in excess of 10,000 psi 69 mpa and 300 deg f 150 deg c. 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 of temperatures and pressures encountered. Well control hpht our well control instrumentation panels and consoles have a proven track record demonstrating reliable design and high quality manufacture. I n n o v a t i v e d r i l l i n g hpht operations pose.
The problem is more challenging in offshore environments. Horizontal wells hydraulic fracturing from tight hpht to multilayer differential depleted gas accumulations in oman j. Challenges for highpressure hightemperature applications. Perspectives on drilling and completion from the field offshore technology report health and safety executive hse on. In the past hpht or hthp was attributed to any condition with pressure or temperature above the atmospheric condition. To explore the challenges of drilling and evaluating hpht wells. Documents can be purchased online as downloadable pdfs or on an annual subscription for single users and companies.
Drilling and completing a well at 4,000 to 7,500foot water depths is no easy task. Finally, well construction in hpht condition implicates several challenges, with wells often deep and having narrow pressure operational window, undesirable long nonproductive times and higherthanplanned costs. Although the term was coined relatively recently, wells meeting the definition have been safely. 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. The company has used expandable tubular technology to drill its deep hpht plays. In many aspects the technical developments and optimizations go hand in hand with the development of solutions to safety issues. Download limit exceeded you have exceeded your daily download allowance. At such depths, the pressure and temperature increases significantly, wherein it is common to observe temperatures that exceed 149177c and a. The slides from this presentation can be found in appendix b.
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. To drill these usually expensive wells successfully, the planning and execution phase has to be of an exceptionally high standard. Tier iii encompasses extreme hpht wells, with reservoir pressures from 30,000 psi to 40,000 psi and or temperatures between 500f to 600f. The well is defined as the flow conduit from the mud pump down the drill string, drill bit and up the annulus to the mud pits. This paper describes research efforts and technology development. Thank you very much for taking your time to fill out our questionnaire.
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. 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. Although high pressure, hightemperature hpht wells are. The physics of an hpht well an hpht well can be categorized as an integrated physical system. Well temperature control involves controlling the temperature of the drilling fluid at surface and delivering the cooled fluid downhole. Volume 2 of model code of safe practice in the petroleum industry part 17. His grey eyes shone and twinkled, and his usually pale. Reservoir imaging hpht opportunities can often combine the. Oil consultants client approached us to provide drilling supervision and support services for the simultaneous drilling of four deepwater wells 3,500ft and four hpht wells. Content of petrowiki is intended for personal use only and to supplement, not replace, engineering judgment. The challenges created by these, make drilling and cementing in these. 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. I have two folders and in each folder there are a lot of pdf files.
Highpressure, hightemperature technologies schlumberger. Contents 1 5 2 11 3 15 4 19 5 27 6 39 7 43 8 49 9 55 10 61 11 65 12 69 epilogue 73 3. High pressure high temperature study bureau of safety and. What is ultrahigh pressure, high temperature oil and gas. Some wells are now drilled in more hostile downhole conditions, which include high temperature and high pressure. Perspectives on drilling and completion from the field offshore technology report. Definition high pressure high temperature hpht wells are defined within the energy institute model code of safe practice part 17 volumes 1 3 as. Pdf materials for deep oil and gas well construction. High temperature, high pressure completion challenges. Guidance for those concerned with well control during the drilling and testing of high pressure and high temperature hpht offshore wells. 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 150c, and either the maximum anticipated pore pressure of any porous formation to be drilled through exceeds a hydrostatic gradient of 0. Porosity and saturation prediction in hpht wells using hydrocarbongas.
Tier iii is the hpht segment with the most significant technology gaps. Hpht systems monitor and record upstream and downstream pressure and temperatures of. A customized manual and course will then be prepared to cater for customer specific needs. Pdf the highprofile blowout at macondo well in the us gulf of mexico, brought. The air rotary method is the fastest and most cost effective for commercial well owners. I originally asked this on adobes forums but yet to receive any reponses. After this course, those involved with hpht wells will be able to find concrete solutions to several problems preventing efficient hpht well operation.
A hightension deployment system bottom right mitigates the risk by combining a standard. Abstract this paper presents an integrated approach on hpht well control in narrow pressure margin wells. Drill cool systems is an integral member of the well design team. 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. 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. Well engineering drilling engineering specialist company offering global technical support and training courses in well integrity, well control and hpht. Conference proceedings of the society for experimental mechanics series. 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. Major challenges in hpht operations survey results of a survey sent to hpht professionals 16 november 2010 hpht wells summit 2010. By the end of the course, delegates will understand the key drivers behind successful hpht drilling engineering so that the well to be drilled is a success first time and without incident.
I am searching for an approach that enables me to merge each two pdf files from both folders if they have the same name. High pressure high temperature hpht workshop output document 4 2 history. According to the department of energy and climate change decc,1 an ultrahigh pressure, high temperature uhpht field is an oil or gas field where the reserve is at a pressure of more than 12,500 psi and a temperature of more than 330 fahrenheit 862 bar and 166 celsius. Challenges and risks of hpht bp, mad dog shell, stones chevron, jack and st malo maersk, culzean petrobras, lula. Nuclear energy factsheet 1 what is ultrahigh pressure, high temperature oil and gas. Managed pressure drilling reaches td in recordsetting.
Best practices for hpht oilfield will cover the elements in hpht drilling, tripping in hpht wells, and hpht well testing. The technology challenges associated with combining the ultrahigh. 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. However cable tool or percussion rigs are still commonly used for shallow domestic supply wells, or large diameter municipal supply wells. 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. 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. However, most of the rules for design in division 3 are. 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 sea, along with the contemporaneous loss of the ocean odyssey semisubmersible drilling vessel in scottish jurisdictional waters.
However, the combined effects of compressibility and temperature changes possible in extreme hpht wells can create significant confusion and potential problems. Proper cementing can provide tremendous benefits to keep positive well economics. 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. Another solution would be the use of continuous circulating system ccs which allows circulation during the connections. The objective is to underline some important consideration related with designing cement for hpht wells.
The approach includes theoretical evaluations, computer simulations with advanced modeling tools, laboratory studies, well control training as well as implementation of. 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. Major challenges in hpht operations linkedin slideshare. Drilling into hpht wells is a new frontier for the petroleum and gas industry. Hpht monitoring is a specialised well control instrument package designed for rigs with 15,000psi rated equipment, operating in fields with high wellhead pressures and temperatures. Challenges and remedy for cementing of hpht wells in. The ability to automatically and simultaneously model both fluid compression and temperature effects makes it much easier to reliably manage critical downhole relationships, while. Spe 163376 hpht 101 what every engineer or geoscientist. The purpose of deepwater drilling projects is essentially no different from other drilling, i. High pressure high temperature hpht workshop output document.
It provides guidance on those well control activities associated with hpht wells which have an impact on safety offshore. Charlie williams of the marine board within the national academies of engineering and sciences gave an overview of the industrys history with hpht technology and fields. At the formation, mud hydrostatic pres operation in sure and friction pressure then combine to. Nov 16, 2010 major challenges in hpht operations 1.
Drilling into hpht wells is a new frontier for the oil and gas industry. A dst was performed over 30ft intervals and flowed gas at an equipment restricted rate of 23 million cubic feet per day. However, heavy reliance on these new technologies may run counter to the guiding principle of keeping hpht wells as simple and reliable as possible. Monitor systems offers flexible design, providing integrated solutions to suit client requirements. Designer casing for deepwater hpht wells viking engineering. Definition high pressure high temperature hpht wells are defined within the energy institute model code of. For use in the federal code of regulations, high pressure has been defined as greater than 15,000 psi and high temperature has been defined as greater than 350 o. The next generation of hpht wells includes full 15 ksi subsea wells as well as.
Managed pressure drilling reaches td in recordsetting hpht. Developing solutions for deepwater hpht applications. Pertaining to wells that are hotter or higher pressure than most. 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. The kristin field is the most extreme hpht field in norway with a. In the uk, hpht is formally defined as a well having an undisturbed. The depth requires wells to flow at increasingly higher rates without damaging the wellbore, which raise the wellhead temperatures. Combining very high mud weight, high temperature, sub sea operation, gas. International association of drilling contractors north. We share our extensive experience earned while operating on high pressure high temperature hpht wells all over the world. High pressure high temperature study bureau of safety. Hpht wells are amongst the most lucrative and dangerous methods of upstream fuel production heres a reminder of what they are, and how. Chapter 1 the time traveller for so it will be convenient to speak of him was expounding a recondite matter to us. Even in 2010 hpht wells summit annual meeting, the survey that.
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