Definition high pressure high temperature hpht wells are defined within the energy institute model code of safe practice part 17 volumes 1. As more highpressure, hightemperature hpht wells are drilled, the use of ceramic fracturing proppants has become commonplace. Thank you very much for taking your time to fill out our questionnaire. Pdf pressure control for drilling completion and well. Titanium xv hpht tools are capable of withstanding differential pressures of 103 mpa 15,000 psi and extreme bottom hole temperatures.
Download design of a hpht chamber for resonance enhanced dr. Well control systems hpht systems description technical specification overall size typical 1200mml x 800mmw x 300mmd overall weight 50kg 70kg zone rating zone 1, zone 2 or safe area working pressure 10,000psi, 15,000psi and 20,000psi monitoring operations. This paper presents an integrated approach on hpht well control in narrow pressure margin wells. Solving hpht completion challenges in the duvernay packers plus. Design of a hpht chamber for resonance enhanced drilling. 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. 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.
International association of drilling contractors north sea. This hpht classification would include wells up to 15 ksi and 350 f 175 c as shown. Developing solutions for deepwater hpht applications. To study well design aspects in hpht environment casing. 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. Pressure control for drilling completion and well intervention operations oil gas industry. 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.
Download the valubond technical sales bulletin pdf. Brine selections that go wrong calcium bromide in a hpht well 28th january 2016 several months ago i had a chat with a couple of reporters from reuters, they were working on a piece related to the elgin gas release and they were interested in learning a bit of corrosion of downhole components. Perspectives on drilling and completion from the field offshore technology report. Tier iii encompasses extreme hpht wells, with reservoir pressures from 30,000 psi to 40,000 psi and or temperatures between 500f to 600f. Conventional designs and test equipment fell short of addressing the inherent problems associated with these types of wells. Spe 163376 hpht 101 what every engineer or geoscientist.
Performance enhancement of selected vegetable oil as base. Baicoi deep some facts two targets, in acquitanian and oligocene temperature. 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. Low cycle cement fatigue experimental study and the effect on. 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. Wells fargo bank status abandoned legalstatus critical current links. Reedhycalog utah, llc 20060918 assigned to reed hycalog, utah, llc. Mpd was proposed in order to map the pore pressure and. Downhole multistage choke technology to reduce sustained. Designer casing for deepwater hpht wells viking engineering. In hpht wells in particular, operators can move from a reactive approach to a proactive approach. To explore the challenges of drilling and evaluating hpht wells. For hpht wells many economic and safety improvements can only be achieved through cross industry learning and equipmentmethod development and this will slow down the pace at which this happens. Us2006299a1 dual subsea production chokes for hpht well.
Nov 16, 2010 major challenges in hpht operations 1. The superhard particles may be positioned adjacent a substrate of cemented metal carbide. The packers plus stackfrac titanium xv system addresses the need for completion systems in wells where differential pressures above 69 mpa 10,000 psi could be encountered. On basis of the information obtained from hpht related well incidents and the scant. Ultrahpht wells are the next class and involve pressures up. Titanium xv hpht tools are capable of withstanding differential pressures. What is ultrahigh pressure, high temperature oil and gas. Extreme resin technology proppants hexion fracline. Chapter 4 gives an introduction to the drillbench software used for simulations and a discussion of some special challenges in a hpht well environment. Nevertheless, the report on models and specific calculations concerning downhole multistage throttling technology for hpht gas wells to reduce the scp has not been publicly released. Solving hpht completion challenges in the duvernay. Risk based technology qualification method for hpht well.
Due to the hpht cycles experienced in the process of hydraulic fracturing, production and steam injection, the failure probability of low cycle cement fatigue is high in these wells and is likely to cause the failure of the zonal isolation and increase the. After this course, those involved with hpht wells will be able to find concrete solutions to several problems preventing efficient hpht well operation. Guidelines for highpressure, hightemperature wells issue 1. With the increasing demand for new technologies in hpht high pressure high temperature wells, more and more attention has been paid to the system of technical qualifications. The designation of highpressure, hightemperature is given to wells that present extreme conditions to operators and service companies. The stress induced by fluid withdrawal in highly compact reservoirs. Design of a hpht chamber for resonance enhanced drilling red. 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. Cement sheath is very important to maintain wellbore integrity in high pressure high temperature hpht wells and steam injection wells. Wells in this field in oman are typically completed using cemented plugandperf operations.
Perspectives on drilling and completion from the field offshore technology report health and safety executive hse on. Brine selections that go wrong calcium bromide in a hpht. Abstract this paper presents an integrated approach on hpht well control in narrow pressure margin wells. 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. It covers those activities associated with hpht wells which have an impact on safety offshore and therefore require special care and attention. Kg field is a hpht field in the krishna godavari basin in the bay of bengal, offshore north east india. Drilling and evaluation presented by christian liss, wireline hpht segment manager at baker hughes 1. Spe172349ms optimizing the drilling hpht deep offshore wells using managed pressure drilling techniques. The results of the study will help improve cement and casing design to maintain wellbore integrity that can in turn be expected to extend throughout the life of the well. Us20050044800a1 container assembly for hpht processing. 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.
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. The can and cap contain the superhard mixture with the sealant barrier positioned within the assembly so as to be. Extremely tight k hpht drilling design and operations. For the hpht section, there was no data available from any of the surrounding wells that could assist in modeling the pore pressure and fracture gradient as inputs for well design. Deepest mpd hpht well drilled offshore malaysia with. High pressure high temperature study bureau of safety.
Major challenges in hpht operations linkedin slideshare. Model code of safe practice part 17 volume 1 high pressure. Side mounted perforating guns technology increases flexibility in multilayered hpht wells. Tier iii is the hpht segment with the most significant technology gaps. F and above 10,000 psi respectively are considered as hpht wells.
Pdf hpht 101what petroleum engineers and geoscientists. Casing connection selection for geothermal applications using. Hpht systems monitor and record upstream and downstream pressure and temperatures of. However, further advances in exploration, extraction and production mean some wells are reaching higher pressures and. 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. Specially designed for the course is designed for, but not limited to drilling engineers, production engineers, and completion engineers who.
Most established norms, standards and recommended practices are written in prescribed formats, setting out methods, procedures and acceptance criteria for product design. The well was spudded on may 7th, 2012 and plugged back on november 5th, 2012. A new approach to drilling fluids engineering in hpht. An assembly for highpressure hightemperature hpht processing comprising a can, a cap, a meltable sealant and sealant barrier, and a superhard mixture comprising superhard particles. Performance enhancement of selected vegetable oil as base fluid for drilling hpht formation. Advanced technology solutions for next generation hpht wells.
The guidelines document recent industry experience to supplement and build upon existing practices, legislation and standards. Guidelines for highpressure, hightemperature wells issue. A customized manual and course will then be prepared to cater for customer specific needs. Definition high pressure high temperature hpht wells are defined within the energy institute model code of safe practice part 17 volumes 1 3 as. Figure 1 shows one classification scheme for hpht wells. In this case, hpht wells are initially identified as having bottomhole pressures above 10 ksi and temperatures above 300 f 150 c. Configurations and methods for subsea hydrocarbon production at high pressure wells are contemplated in which production control is achieved by implementing two choke valves in series between the wellhead and the riser the first production choke reduces pressure from well pressure to a reduced pressure, while the second production choke further reduces the pressure from the reduced pressure to. International association of drilling contractors north. 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. Using this method, the operator had found that in some cases treatments could not be executed as designed because formation breakdown pressures were too high, even using high pressurehigh temperature hpht equipment rated above 10,000 psi 69 mpa.
This paper presents proposed models of the wellbore pressure and temperature distribution profile of a new downhole multistage choke technology to control scp. Pdf materials for deep oil and gas well construction. Download limit exceeded you have exceeded your daily download allowance. However, most of the rules for design in division 3 are. Although the term was coined relatively recently, wells meeting the definition have been safely. To identify the hpht safety issues a comprehensive search of the hse databases was carried out. Hpht 0114001b high pressure high temperature systems hpht.
The field has been extensively appraised by 15 wells to date. Pertaining to wells that are hotter or higher pressure than most. In the uk, hpht is formally defined as a well having an undisturbed. Download and read free online design of a hpht chamber for resonance enhanced drilling red by david onalo. During the production process in hpht wells, the pressure differential inside the casing and the surrounding formation is larger than the conventional wells.
At such depths, the pressure and temperature increases significantly, wherein it is common to observe temperatures that exceed 149177c and a. Major challenges in hpht operations survey results of a survey sent to hpht professionals 16 november 2010 hpht wells summit 2010. To study well design aspects in hpht environment free download as powerpoint presentation. The approach includes theoretical evaluations, computer simulations with advanced modeling tools, laboratory studies, well control training as well as implementation of. Challenges and risks of hpht bp, mad dog shell, stones chevron, jack and st malo maersk, culzean petrobras, lula. 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. Then in chapter 5 a hpht well scenario is built for simulation purposes. Using the dti definition some 227 wells drilled in the ukcs in the period 19872003 were identified as hpht wells. Most oil and gas wells are drilled using rotational drilling and a few with percussive drilling. Drilling hpht wells pose a big challenge in the oil and gas industry. Proper cementing can provide tremendous benefits to keep positive well economics.
Uncoated ceramics encounter serious performance issues when exposed to these harsh well conditions. Drill wells to target depth and eliminate additional casing string. 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. Side mounted perforating guns technology increases. Casing connection selection for geothermal applications. However, heavy reliance on these new technologies may run counter to the guiding principle of keeping hpht wells as simple and reliable as possible. This well was the second well drilled in the twowell hpht campaign in 2012. C 300f and requiring pressure control equipment with a rated working pressure of above 69 mpa 10,000 psi s.