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AmerAha Inc. MWD•2 Dnlhng and Completion Report <br />In the R-6 and L-S Zones, many ofthe marlstonc and oil shale cuttings contained pi[s and small <br />vugs produced by dissolution oC naluolite (NaHCO;) crystals (prior to drilling). Pyrite is <br />conunonh associated with the rims of the pits and vugs. <br />-w 1'F;NF:TF2A1'IOV Ii:\'I'F:S <br />1'enctration-rate data were collected by Lang personnel between depths of 35 and I '~)S feet, and <br />I .d7S and 1.670 feet ('fable 4). Additional penetration rate data, which were collected by <br />.-1 persomtcl from Daub & Associates. lnc.. Cram the interval betw•cen 1.355 and 1.703 feet, can be <br />ti~und in -fable ±. In Table 3, the elapsed time tier drilling a 20-toot-rod-length (or shorter <br />-' inten•al) btclt~des the time to make the connection and to collect water-discharge and,'or water- <br />gcochcmistry data; thus, the penetration-rate numbers arc "collective." In Table 4, the elapsed <br />time is broken dowm into actual drilling time and the time to nt•dce a connection. plus water <br />sampling and maintenance time. Penetration-rate data (iOnt Tables I and _' arc summarized <br />graphically in Figure 6. As documented in Figure 6, actual pcnctration rates during drilling of <br />the 10-inch-diameter leg of the hole (20 to 1.055 feet) ranged from 20 to 130.0 feet per hour <br />t Ivhr), :md averaged 65.7 iu1tr, w•hercas for the 9g-inch-diameter leg (LOSS to 1,670 fcetl the <br />range was Cram 10.7 to 40.U fvttr. and the :average was 21.0 ftr7tr. the collective pcnctration <br />_.' rates for the ~b-inch -diameter leg of the hole { 1.670 to 1.703 feet) ranged from 3.5 to 4.d tv7tr. <br />imi ;n rra~~:,l •t Il fi'hr. <br />1 <br />1 <br />_, <br />1 <br />1 <br />_ , <br />(hcrall. the collective and actual penetration rates progressively decreased down hole, especially <br />txluw about r)I S feet. :\( this depth there was a significant increase in the amount of <br />groundwater cncountcred 125 to 70 gpm dischamc). <br />GRO1'~,\U\1:11 I~:R Ill l)ROLOGI' <br />Un-Sire Ohserrnrions uJUisrlmr~~~ and Basic li irrer ~rnalih <br />\1casurablc groundwater discharge while drilling was first noted at approximately 255 feet in the <br />Uinta Formation-Green Itivcr Fornation transition zone (Table 61. Lang personnel pcriodicalh <br />noted the volume of discharge water dn~cn to I."_'S5 fret. Prom 1.3R0 feet to TD (1.?0 ~ feet) <br />groundwater-discharge data were collected by personnel Crum [):wb R :\ssociates, Inc., even <br />