High pressure high temperature hpht workshop output document. 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. The mixture of acetic and formic acids is a viable option for hpht wells. In addition, thermalrecovery projects to extract heavy oil are located in.
A new approach to drilling fluids engineering in hpht environments oriji, aleruchi boniface on. International association of drilling contractors north. This course is also for any individual who would like to learn about completion of hpht wells. Halliburton offers completion solutions for mature fields designed to help customers improve oil and gas production while minimizing water cut. 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 designation of highpressure, hightemperature is given to wells that present extreme conditions to operators and service companies.
Therefore, wells in these types of scenarios must meet high integrity and cost standards while also. As this paper is written kristin has finished drilling of 4 high angle hpht wells and 2 low angle wells. 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. 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. Using the dti definition some 227 wells drilled in the ukcs in the period 19872003 were identified as hpht wells. Many upcoming hpht deepwater gasoil wells, particularly in the gulf of mexico, fall into the tier ii category. Rr409 high pressure, high temperature developments in the. Wellcat softwares drilling, production, casing, tubing, and multistring modules allow the. This material is built to withstand friction in the liner so wear on your liners is minimized.
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. To identify the hpht safety issues a comprehensive search of the hse databases was carried out. 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. 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. High pressure high temperature hpht workshop output. 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. How to translate and sustain hpht drilling casestudy findings, success and failure learnings into future drilling projects. Nuclear energy factsheet 1 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. Halliburton can meet your hpht formation and reservoir evaluation challenges to. Spe172349ms optimizing the drilling hpht deep offshore wells using managed pressure drilling techniques. Model code of safe practice part 17 volume 1 high pressure.
Identify and eliminate the drilling hazards and risks within hpht wells to as low as practicable. Hpht troubleshooting ideas create drilling solutions visit us at. Mud master hpht pistons high pressure, high temperature. Hpht session christy lan bsee brian skeels fmc, 17d, tr8, 17g, etc. 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. Api technical report 17tr8 american petroleum institute. It also examines how north sea experience has been used to help convert a jackup to drill demanding wells off brunei. Delivering success in hpht reservoirs through experience. 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.
Tier iii is the hpht segment with the most significant technology gaps. Bsee will continue to use current process for issuing approval for ocs projects. In the past hpht or hthp was attributed to any condition with pressure or temperature above the atmospheric condition. Wells reservoir team leader and drilling manager for shell uk limited, bp expolraion.
Hpht cementing guidelines introduction definition of hpht hpht wells are defined by the norwegian petroleum directorate, i. Tier iii encompasses extreme hpht wells, with reservoir pressures from 30,000 psi to 40,000 psi and or temperatures between 500f to 600f. According to the department of energy and climate change decc,1 an ultrahigh pressure, high temperature uhpht. Pdf hydrogen sulfide produces embrittlement in high strength low allow hsla steels used in oil exploration and extraction due to the. 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. Esanda engineering hpht well design and drilling operations. Repsol well design and risk mitigation processes, the case of hpht. Hpht troubleshooting independent drilling engineering. Hpht well opportunities as lucrative as those of less challenging wells. Spe 163376 hpht 101 what every engineer or geoscientist.
The value of comprehensive well integrity analysis in deep. Guidelines for highpressure, hightemperature wells. 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. What is ultrahigh pressure, high temperature oil and gas. Introduction to high pressure high temperature hpht. 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 2010.
Developing solutions for deepwater hpht applications. You do not want to remain stuck during an ongoing well control event iadc definition which type of jar is the most suitable for use in an hpht. 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. 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. Tieback casing design and sour service material qualification is the. Day one introduction during this introductory section we will introduce the value of troubleshooting oh hpht wells, which are among the highest cost wells. Pdf the highprofile blowout at macondo well in the us gulf of mexico, brought the. Introduction drilling high inclination wells itself, are maybe not the most impressing. Ultrahpht conditions will be the next challenge oil. Abstract this paper presents an integrated approach on hpht well control in narrow pressure margin wells. The principal hpht areas are found in the united states deepwater gulf of mexico and. Russell hoshman bsee dan fraser anl may 8 th, 2015 to promote safety, protect the. Pertaining to wells that are hotter or higher pressure than most. Pdf hpht 101what petroleum engineers and geoscientists.
A new approach to drilling fluids engineering in hpht. These statements are not guarantees of future performance, prices, margins, exchange rates or other events and are subject to material risks, uncertainties. Safety case revisions should therefore describe the safe management of all hpht activities not just the current hpht. The rate of heat exchange between the mud, the casings and. Offshore operators committee ooc hpht workshop output serving the industry for more than 70years. Npd as wells deeper than 4000m tvd andor those that have an expected. 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.
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