Many upcoming hpht deepwater gasoil wells, particularly in the gulf of mexico, fall into the tier ii category. Introduction to high pressure high temperature hpht. The principal hpht areas are found in the united states deepwater gulf of mexico and. Hpht troubleshooting independent drilling engineering. This course is also for any individual who would like to learn about completion of hpht wells. Developing solutions for deepwater hpht applications. Guidelines for highpressure, hightemperature wells. Identify and eliminate the drilling hazards and risks within hpht wells to as low as practicable. Halliburton can meet your hpht formation and reservoir evaluation challenges to. The mixture of acetic and formic acids is a viable option for hpht wells. Pdf the highprofile blowout at macondo well in the us gulf of mexico, brought the. Delivering success in hpht reservoirs through experience. Tieback casing design and sour service material qualification is the.
In addition, thermalrecovery projects to extract heavy oil are located in. 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. A new approach to drilling fluids engineering in hpht. Introduction drilling high inclination wells itself, are maybe not the most impressing. In hpht formations, the wells are subjected to high temperature variations and these changes affect both the formation and the casings, causing expansion and contraction. The value of comprehensive well integrity analysis in deep. Bsee will continue to use current process for issuing approval for ocs projects. High pressure high temperature hpht workshop output document. Esanda engineering hpht well design and drilling operations. Pdf hpht 101what petroleum engineers and geoscientists. Pdf high strength low alloy steel for hpht wells researchgate.
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. 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. Tier iii is the hpht segment with the most significant technology gaps. Major challenges in hpht operations survey results of a survey sent to hpht professionals 16 november 2010 hpht wells summit 2010. Mud master hpht pistons high pressure, high temperature. 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. Hpht troubleshooting ideas create drilling solutions visit us at. Hpht cementing guidelines introduction definition of hpht hpht wells are defined by the norwegian petroleum directorate, i. High pressure high temperature hpht workshop output. Halliburton offers completion solutions for mature fields designed to help customers improve oil and gas production while minimizing water cut. It also examines how north sea experience has been used to help convert a jackup to drill demanding wells off brunei. Offshore operators committee ooc hpht workshop output serving the industry for more than 70years. Abstract this paper presents an integrated approach on hpht well control in narrow pressure margin wells.
The designation of highpressure, hightemperature is given to wells that present extreme conditions to operators and service companies. Api technical report 17tr8 american petroleum institute. Therefore, wells in these types of scenarios must meet high integrity and cost standards while also. Nuclear energy factsheet 1 what is ultrahigh pressure, high temperature oil and gas. The mud master hpht pistons are made of a special oilresistant bonded urethane that performs well in syntheticoil based mud obm as well as water based mud wbm. A new approach to drilling fluids engineering in hpht environments oriji, aleruchi boniface on. These statements are not guarantees of future performance, prices, margins, exchange rates or other events and are subject to material risks, uncertainties. Ultrahpht conditions will be the next challenge oil. Model code of safe practice part 17 volume 1 high pressure. Wells reservoir team leader and drilling manager for shell uk limited, bp expolraion. How to translate and sustain hpht drilling casestudy findings, success and failure learnings into future drilling projects. Npd as wells deeper than 4000m tvd andor those that have an expected.
Safety case revisions should therefore describe the safe management of all hpht activities not just the current hpht. Using the dti definition some 227 wells drilled in the ukcs in the period 19872003 were identified as hpht wells. Spe172349ms optimizing the drilling hpht deep offshore wells using managed pressure drilling techniques. Repsol well design and risk mitigation processes, the case of hpht. In the past hpht or hthp was attributed to any condition with pressure or temperature above the atmospheric condition. This material is built to withstand friction in the liner so wear on your liners is minimized. As this paper is written kristin has finished drilling of 4 high angle hpht wells and 2 low angle wells. 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. Spe 163376 hpht 101 what every engineer or geoscientist.
Day one introduction during this introductory section we will introduce the value of troubleshooting oh hpht wells, which are among the highest cost wells. What is ultrahigh pressure, high temperature oil and gas. Table 3 summarizes the gaps and expected lead times to develop equipment for shelf hpht wells. Rr409 high pressure, high temperature developments in the. Wells drilled with oilbase mud systems tend to have higher downhole temperatures than do wells that are drilled with waterbase mud systems and thus potentially expose downhole tools to high operating temperatures.
High pressure and high temperature wells hpht wells. The rate of heat exchange between the mud, the casings and. Hpht well opportunities as lucrative as those of less challenging wells. The use of some convertor such as na 2 co 3 and naoh can convert gypsum to acidsoluble compounds that can be removed using an acid. Pertaining to wells that are hotter or higher pressure than most. Hahpht wells, high angle high pressure high temperature wells. The approach includes theoretical evaluations, computer simulations with advanced modeling. What every engineer or geoscientist should know about high pressure hightemperature wells article pdf available january 2012 with 3,184 reads how we measure reads. Russell hoshman bsee dan fraser anl may 8 th, 2015 to promote safety, protect the.
Pdf hydrogen sulfide produces embrittlement in high strength low allow hsla steels used in oil exploration and extraction due to the. Wellcat softwares drilling, production, casing, tubing, and multistring modules allow the. On basis of the information obtained from hphtrelated well incidents and the scant information about hpht problems encountered in other areas, a number of apparent safety issues and uncertainties have been identified. Tier iii encompasses extreme hpht wells, with reservoir pressures from 30,000 psi to 40,000 psi and or temperatures between 500f to 600f. Finally, well construction in hpht condition implicates several challenges, with wells often deep and having narrow pressure operational window, undesirable long nonproductive times and higherthan. According to the department of energy and climate change decc,1 an ultrahigh pressure, high temperature uhpht. International association of drilling contractors north. High pressurehigh temperature hp ht 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. 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. The term hpht may be applied to wells that have only high pressure or high temperature few wells have both characteristicsbut regardless of the designation. To identify the hpht safety issues a comprehensive search of the hse databases was carried out.
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