HW #7-Prob2-Solution - PETE 411 BALANCED CEMENT PLUG HW#7...

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Unformatted text preview: PETE 411 BALANCED CEMENT PLUG HW#7 Mar. 4 2002 ASSUMPTIONS: Cement, Class H Water Silica Sand, BWDC Top of Cement Plug Bottom of Plug Bit Diameter Excess Volume Effective Diameter Drill Pipe DD 5 Drill Pipe Wt. 19.5 DP Capacity 0.0177617 0.09973 Vol. ofAnnular Water Spacer 39.34 Volume of DP Water Spacer 16.34 Mud Density ANSWERS . Density of cement slurry 15.36 lbigal . Yield of cement slurry 1.344 fialSk . Volume of cement slurry required 336.2 Ft3 . Volume of mixing water required 33.32 bbls 1 2 3 4. Number of sacks of cement required 237.4 sks 5 6 . Height of cement plug when bottom of drill pipe is at 10,500 ft 749.3 7. Height ofwater column above cement in annulus 216.3 ft ft 3. Height of water column inside drill pipe 163.9 ft ft 9. Height of mud column inside drill pipe for plug to be balanced 9569.3 10a. Pressure at Bottom of Cmt Plug after Plug Placement 6,166 psi 10b. Volume of mud pumped to displace cement 170.0 bbls CALCULATIONS: DENSITY and YIELD of Slurry Mixing of Cement: COMPONENT QUANTITY UNITS S.G. MASS VOLUME lbs gal Cement, Class H 94 5k 3.14 94 3.594 Water 5.6 gal 1 46.65 5.6 Silica Sand 20 % 2.63 18.8 0.858 TOTALS: 159.4 10.05 1. Density of Mixture = total massitotal volume = 15.86 lblgal 2. Yield of Mixture = (V1+V2+... )l 7.48 = 1.344 cu.ftIsk NOTE: Volume Mass of Silica Flour 3. Volume of Cement Slurry Required With no Excess: 30, With 40% 1 .40 3B. Efiective Hole Diameter (with the excess) TE v2 21d; h MassiDensity = Massi(S.G. * 8.33) Percent ’ Wt. of1 sk. ofCement 75 V : —d2 h 4 = 3.5 in = 0.7033 n = 700 ft = 275.3 ft] Excess = 386.2 f? 4V d = 2 50’ 2 TE h = 386.2 ft1 = 700 e = 0.3331 ft 4. Number Of sacks of cement required Yield of Cement Slurry 1 .344 cu.fiJsk Number of sacks of Cement required = Volume of Slurry 1 Yield of Slurry 386.2 l' 1 .344 5. Volume of mixing water required 28?.4 Vol. of Mix Water req'd = Vol. req'd per sack * no. of sacks = 5.6 galisk * 287.4 Volume of mixing water required 6. Height of cement plug when bottom Annular Capacity, C = But, of drill pipe is at 1609 38.32 10,500 c : £6122 7 dplpe) d2 dpipe dpipe 30, C and T Hence, C+T V H : 2 C +T and V2 30, H 0 .8381 5 .000 0 .41 67 0.4153 0 .09973 0.5151 386.2 749.8 7. Height of water column above cement in annulus 16.00 89.84 0.4153 216.3 SX. al bbl in film ft’m elm bbl 33m ...
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