Bluebell Field DOE Class I Study
The Bluebell field study entitled “Increased oil production and reserves from improved completion techniques in the Bluebell field, Uinta Basin, Utah” is a five year project
funded inpart by the U.S. Department of Energy under their Near Term, Class I, Field Demonstration in Fluvial Dominated Deltaic Reservoirs, oil program.
Public abstract from the proposal submitted
to the U.S. Department of Energy in January 1992.
VOLUME II – DEMONSTRATION PROJECT
Over 378 million bbls of oil has been produced from sandstones deposited in fluvial- dominated deltas in the Paleocene/Eocene Green River and Wasatch Formations in the Uinta Basin, Utah. Production is from an oil-bearing section up to 8,000 feet thick, of which 2,500 feet is overpressured. The Bluebell field is the largest field in the Uinta Basin having produced over 118 million barrels of oil from 213 active wells. However, examination of mud log shows, geophysical logs, and reservoir data indicate that generally less than 25% of the perforated and potentially productive zones contribute oil and gas to the wellbores. Well spacing is 320 acres and 640 acres in many areas of the field. The risk of abandonment is high due to the decline in production rates and increasing water cut from many of the older wells. Approximately 25% of the wells have been abandoned already. At least 1 billion bbls of mobile oil is at risk of being left behind in the Uinta Basin because of inefficient completion practices and undrained heterogeneous reservoirs.
Geologic characterization of the Green River-Wasatch formations is generally on a basin wide scale, and does not address individual facies within the Bluebell field. Lacking detailed knowledge of individual reservoirs, completion practices used over the past 30 years continue to be applied to large gross intervals in a “hit or miss” fashion. Thus there is the potential for vast increases in production and reserves by improving completion techniques in the Uinta Basin.
A three phase, multidisciplinary approach will used to increase production and reserves in the Bluebell field. Phase 1 will be the geological and reservoir characterization of the Green River and Wasatch Formations. This will include: a) log analysis and petrophysics evaluation, b) examination of outcrops, well cuttings and cores in order to understand microfacies heterogeneity and reservoir capacity, c) detailed correlation of geophysical logs and construction of various subsurface maps to define lithofacies, fracture trends, and paleodepositional setting of primary producing horizons, d) determine the location of fractures throughout the producing section, their orientation, nature and relation to lithology or facies, e) statistical analysis of the completion techniques and production histories of wells in the field to identify those practices which are most economical and result in the most productive wells, f) determination of in-place and mobile reserves as well as increased mobile reserves resulting from the demonstration project.
Phase 2 will be a demonstration project testing zones and areas recommended from the geological characterization using completion techniques identified as having the greatest potential for increased well productivity. The demonstration project will include a) recompletion of a well that suffered formation damage during drilling operations, b) a redrill of a portion of a well that suffered formation damage during the original completion, c) the drilling and completion of a new well to show that careful geological and engineering can correctly lead to improved production and increased reserves.
Phase 3 will be evaluation of the demonstration projects and technical transfer of the geologic and reservoir characterization and the results of the demonstration project. The multidisciplinary consortium approach, composed of operators, service companies, consultants, academics, and state agencies, is inherently built into the project to improve the technical transfer phase. Technical transfer activities include a) a petroleum extension service, b) workshops, seminars in Salt Lake, Vernal, Denver, and Houston, c) publications and technical presentations, d) the creation of digital databases, and e) addressing regulatory, economic, and financial needs.
January 22, 1996, Submitted By Craig D. Morgan
For more information on the Bluebell Project, contact Craig Morgan, (801) 537-3370 or email: email@example.com
Bluebell Field DOE Class I Study: Bluebell Field Study: Kuongezeka kwa Uzalishaji wa Mafuta na Hifadhi kutoka kwa Mbinu za Kukamilisha katika Bluebell Field, Utah, ni mradi wa miaka mitano unaofadhiliwa na Idara ya Nishati ya Marekani chini ya kipindi cha karibu, darasa la I, Maonyesho ya Shamba katika Hifadhi za Delta za Mto. Maelezo ya jumla ya pendekezo lililowasilishwa kwa Idara ya Nishati ya Marekani mnamo Januari 1992. Zaidi ya mabomba milioni 378 ya mafuta yametengenezwa kutoka kwa mawe ya mchanga yaliyowekwa katika delta za mto katika Paleocene-Eocene Green River na Wasatch Formations katika Bonde la Uinta, Utah. Mafuta hayo yanatoka katika sehemu yenye unene wa meta 8,000 na meta 2,500 ni ya shinikizo la juu. Bluebell ni shamba kubwa zaidi katika Bonde la Uinta, na limetengeneza zaidi ya mapipa milioni 118 ya mafuta kutoka visima 213 vinavyofanya kazi. Hata hivyo, uchunguzi wa magogo ya matope, magogo ya kijiografia, na data ya hifadhi ya maji inaonyesha kwamba kwa ujumla chini ya 25% ya maeneo ya perforated na uwezekano wa uzalishaji huchangia mafuta na gesi kwa mabomba. Sehemu ya shimo ni 320 ekari na 640 ekari katika maeneo mengi ya shamba. Hatari ya kuachwa ni kubwa kutokana na kupungua kwa viwango vya uzalishaji na kuongezeka kwa maji yaliyokatwa kutoka kwa visima vingi vya zamani. Karibu asilimia 25 ya visima hivyo vimeachwa. Karibu bilioni moja ya mafuta ya mtiririko wa mtiririko wa mtiririko wa mtiririko wa mtiririko wa mtiririko wa mtiririko wa mtiririko wa mtiririko wa mtiririko wa mtiririko wa mtiririko wa mtiririko wa mtiririko wa mtiririko wa mtiririko wa mtiririko wa mtiririko wa mtiririro wa mtiririko wa mtiririko wa mtiririko wa mtiririko wa mtiririko wa mtiririko. Geological sifa ya Green River-Wasatch malezi ni kwa ujumla juu ya bonde pana kiwango, na haina kushughulikia facies binafsi ndani ya Bluebell uwanja. Kwa kukosa maarifa ya kina ya hifadhi za mtu binafsi, mazoea ya kukamilisha yaliyotumiwa katika miaka ya 30 iliyopita yanaendelea kutumika kwa vipindi vikubwa vya jumla kwa mtindo wa "hit au miss". Hivyo kuna uwezekano wa ongezeko kubwa la uzalishaji na akiba kwa kuboresha mbinu za kukamilisha katika Bonde la Uinta. Hatua ya awamu tatu, mbinu mbalimbali itatumiwa kuongeza uzalishaji na akiba katika uwanja wa Bluebell. Hatua ya kwanza itakuwa sifa ya kijiolojia na hifadhi ya Mto Green na Wasatch Formations. "Hii inajumuisha: ""Uchambuzi wa log na tathmini ya petro-fizikia; uchunguzi wa outcrops, well cuttings na cores ili kuelewa microfacies heterogeneity na uwezo wa hifadhi; mahusiano ya kina ya logs ya kijiografia na ujenzi wa ramani mbalimbali za chini ya ardhi ili kufafanua lithophases, mielekeo ya fractures, na kuweka paleodepositional ya horizons ya uzalishaji wa msingi; kuamua eneo la fractures katika sehemu ya uzalishaji, mwelekeo wao, asili na uhusiano na lithology au facies; uchambuzi wa takwimu wa mbinu za kukamilisha na historia ya uchimbaji wa mashimo katika uwanja; kutambua wale ambao ni kiuchumi zaidi na kusababisha mabwawa zaidi.""" Hatua ya pili itakuwa mradi wa maonyesho, kujaribu maeneo na maeneo yaliyopendekezwa kutoka kwa sifa ya kijiolojia kwa kutumia mbinu za kukamilisha zilizotambuliwa kuwa na uwezekano mkubwa wa kuongeza uzalishaji wa kisima. Mradi wa maonyesho utajumuisha: (a) kukamilisha tena shimo ambalo lilipata uharibifu wa malezi wakati wa shughuli za kuchimba; (b) kuchimba tena sehemu ya shimo ambalo lilipata uharibifu wa malezi wakati wa kukamilika kwa awali; (c) kuchimba na kukamilisha shimo jipya ili kuonyesha kuwa uhandisi wa kijiolojia na uhandisi unaweza kusababisha uzalishaji ulioimarika na kuongezeka. Hatua ya tatu ni tathmini ya miradi ya maonyesho na uhamisho wa kiufundi wa sifa za kijiolojia na hifadhi na matokeo ya mradi wa maonyesho. Njia ya ushirika wa taaluma nyingi, iliyoundwa na waendeshaji, makampuni ya huduma, washauri, wasomi, na mashirika ya serikali, ni asili ya ujenzi katika mradi huo ili kuboresha awamu ya uhamisho wa kiufundi. Uhamisho wa teknolojia ni pamoja na huduma ya upanuzi wa petroli, semina za kazi, semina katika Salt Lake, Vernal, Denver, Houston, machapisho na maonyesho ya kiufundi, uundaji wa hifadhidata za dijiti, na kukabiliana na mahitaji ya kisheria, kiuchumi na kifedha. "Kama ilivyoelezwa katika makala ya kwanza ya makala hii, ""Kupitia Mfumo wa Bluebell,"" unaweza kupata maelezo zaidi kuhusu mradi wa Bluebell kupitia simu ya Craig Morgan, 801-537-3370, au barua pepe: email@example.com."