Design a 5 1/2" O.D. casing string to 16,500 ft, using any of the P- 110 casing weights. Assume worst possible conditions (no backup for burst or collapse, etc.). Use the API design factors (Collapse 1.125, Burst 1.1, Tension 1.8). The weight of the mud in the hole is 14.0 lb/gal. Expected formation pressure below the casing seat is 10,500 psi. You must design the most economical combination casing string for this well. Provide the following information: a) Weight/ft of casing in bottom section of string b) Length of bottom section c) Weight/ft of casing in top section of string d) Total weight of string in air e) What kind of threads should be used near the top ... lb/ft ......ft lb/ft lbs f) Actual weight of string in mud, considering buoyancy, and assuming that the string is full of mud on the inside ...... lbs Page 14. Size D.D. In. 5% Grade WI Per Fl Inside With Dia. Cplg.. In. Lb. 13.00 5.044 4.919 14.00 5.012 14.00 5.012 15.50 4.950 17.00 4.892 *V-150 *V-150 *V-150 Thread & Cpig. Drift Dia. In. 4.892 4.778 4.670 4.548 *F-25 H-40 J-55 4.887 6.050 4.825 6.050 J-55 J-55 4.767 6.050 K-55 14.00 4.887 5.012 6050 K-55 15.50 4.950 4,825 6.050 K55 17.00 4.892 4.767 6.050 17.00 C-75 4.892 C-75 20.00 4.778 23.00 C-75 *C-75 26.00 4.670 4.548 6.050 4.887 6.050 DIMENSIONS AND Extreme Line A.D. of Cplg. In. N-80 17.00 N-30 20.00 N-80 23.00 *N-BO 26.00 17.00 4.892 4.767 6050 20.00 4.778 4.653 6.050 23.00 4.670 4.545 6,050 4.548 4.767 6.050 4.653 6.050 4.545 6.050 C-95 C-5 C-95 *C-95 26.00 R-110 4,892 17.00 P-110 20.00 4.778 23.00 4.670 P-110 *R-110 26.00 4.548 4.767 6.050 4.653 6.050 4.545 6.050 4.767 4.653 4.545 6.050 6050 6.050 20.00 4.778 4.653 6.050 23.00 4.670 4.545 6.050 26.00 4.548 4.423 6.050 Drift Dia. In. 4.653 5.860 4.653 5.880 O.D. of Box In. 4.653 4.653 TABLE 4.545 5.880 4.423 5.656 4.545 4.423 Col'pse Resis. tance PSI 1,660 2,630 3,120 4.653 5.860 4,040 4.653 5.860 4,910 4,040 4,910 3,120 5.860 6070 5.860 8,440 10,460 11,860 4.653 5.860 4.653 5.860 5.860 5.656 12,650 4.653 5.860 4.653 5.860 10,000 4.545 5.860 12,920 6,280 8,830 11,160 6,930 4.423 5.656 15,020 4.653 5.860 7,460 4.653 5.880 4.545 5.860 4.423 5.656 17,390 11,080 14,520 13,480 18,390 23,720 --- I NO. 203 STRENGTHS OF CASING Internal Yield Pressure PSI"* Round Thread But- tress Thd. Short Long Plain End or Ext. Line 1,810 3,110 4,270 4,810 4,810 4,810 5,320 5,320 5,320 5,320 3,110 4,270 4,810 4,270 4,810 5,320 7,250 8,610 9,900 11,360 7,740 9,190 10,560 12,120 9,190 10,910 12,540 14,390 10,640 12,640 14,520 16,660 11 4,270 4,810 4,810 4,810 5,320 5,320 5,320 |||||||||||||||||| Body Yield Stgth. 1,000 Lbs. 7,740 9,190 8,990 9,880 8,990 222 248 273 ,, 2015 10,640 10,640 12,640 12,360 13,580 12,360 17,230 16,860 18,520 16,800 22,720 222 7,250 8,610 8,430 437 9,260 8,430 7,250 372 248 273 497 397 7,740 9,190 9,190 10,910 10,680 554 11,730 10,680 530 471 546 641 874 Threaded & Cpig. Joint Round Thread 5 -- Short 130 172 200 229 189 252 432 455 ||||||||| Joint Strength 1000 Lbs." Long ---2727-28S -S 239 327 403 473 348 502 315+ 374 460 540 445 548 643 But- tress Thd. 701 823 / | , ! 300 402 423 497 550 446 524 579 480 608 568 724 500+ 393+ 564+ Page 15. 713## 451+ 521 908 910 Ext Line Joint ISI GTBD 138 296998)III 471 549 577 606 7491 722 892++ 722+ do Area Weight (in.) (lbm/ft) dole (sq in.) 18 15.52 42 11.6 4 13.5 5 5 5 5 5 5%2 17 5 20 51/2 23 6% 6% 6% to PP- to t 7 7 7 7 7 758 75 758 756 7% 7% 858 8% 8%8 958 958 15 18 21.4 23.2 24.1 13% 13% 24 28 32 26 29 32 35 38 26.4 29.7 33.7 39 42.8 45.3 47.1 40 44 49 43.5 47 53.5 10% 10% 10% 10% 65.7 113 60 68 72 TABLE 2.4h-MINIMUM COLLAPSE RESISTANCE UNDER AXIAL LOAD, GRADE P-110 Axial Stress. psi 10.000 15.000 20.000 25.000 30,000 35.000 40,000 45.000 Collapse Pressure. psi 3.338 3.836 16.89 4.374 13.81 5.275 11.44 6.264 10.46 6791 10 7.069 18.09 4.962 15.24 5.828 13.25 6.63 18.82 6.937 15.89 8.133 13.95 9.177 19.34 7 549 17.16 8 449 15.45 9.317 14.06 10.172 12.96 10.959 23.25 7.519 20.33 8 541 17.73 972 15.25 11 192 12.47 13.57 13.141 13.745 12 82 12 2 19 17 11.557 17 25 12 763 14.118 15.48 22.13 12.559 20.39 13.572 17.66 15 547 51 23.89 14.561 55.5 21.72 15.947 60.7 19.72 17.473 18.07 18.982 24.03 17.3 27.86 19.445 26.02 20.768 - 10.000 - 5.000 0 5.000 50.000 5.270 6.790 7,720 7.650 7,580 7.490 7.390 7,290 7.170 7,040 6.900 6.740 6.560 6.370 6.160 10.980 10.840 10,680 10.510 10,330 10.130 9.920 9.690 9.440 9,170 8.880 8,560 8,230 9.060 8.960 8.850 8.730 8,600 8.460 8,300 8.130 7,940 7,740 7.520 7,270 7,010 13.900 13.700 13.470 13.230 12.970 12.690 12,390 12.060 11,720 11.350 10.960 10.530 10.080 18,290 17.940 17,550 17.140 16.700 16.230 15.740 15.210 14.660 14.080 13.470 12,820 12.140 19.830 19.440 19.020 18.570 18.100 17.590 17,060 16.490 15,890 15.260 14.600 13,900 13,160 20.640 20.230 19.800 19.330 18.840 18.310 17.750 17.160 16.540 15.880 15.190 14.470 13,700 7.620 7.550 7.480 7.400 7.300 7.200 7,090 6.960 6.820 6.660 6.490 6.300 6.100 11,410 11.260 11,100 10.920 10.720 10,510 10.280 10.040 9,780 9.490 9.190 8.860 8.500 15.030 14.800 14.540 14.270 13.980 13.670 13.330 12.980 12.590 12.190 11.750 11,220 10.620 6.830 6.790 6.730 6.670 6,590 6.510 6,420 6.320 6.200 6.080 5.930 5.780 5.600 10,430 10.300 10,160 10.000 9.830 9.650 9.450 9.240 9.010 8.760 8.490 8.190 7,880 13.640 13.440 13.220 12.980 12.730 12.460 12.160 11,850 11.510 11.150 10.770 10.350 9.910 6.310 6,270 6.230 6.180 6.120 6.050 5.980 5.890 5,800 5.690 5.560 5,420 8.720 8.630 8.530 8.420 8,290 8.160 8,010 7,850 7,680 7,480 7.270 7,040 11,090 10,940 10.780 10.610 10,430 10.230 10,010 9.770 9.520 9,250 8.950 8.640 8,300 13.430 13.240 13,020 12.790 12,540 12.280 11.990 11.680 11,350 11.000 10.620 10,220 9.780 15.650 15,400 15,140 14,850 14.540 14.210 13.860 13.480 13.080 12.570 12.020 11.450 10.840 3.970 3.950 3,920 3.890 3,860 3.810 3.770 3.710 3.650 3.580 3.500 3.410 3.310 5.440 5.390 5,350 5.320 5,290 5.250 5,200 5.140 5.080 5.000 4.910 4,800 4.680 8.030 7,960 7,870 7.780 7.760 7.560 7,430 7,290 7.140 6.970 6.790 6.580 6.360 11.400 11,250 11,080 10.900 10.710 10.500 10,270 10.030 9.760 9.480 9.170 8.850 8,490 14,370 14,160 13.920 13.670 13.390 13.100 12,780 12,450 12,080 11.700 11.290 10.850 10.380 15,950 15.700 15.430 15.140 14.820 14.480 14.120 13,710 13,220 12.690 12.140 11.560 10.950 17.260 16.920 16.550 16.170 15.750 15.310 14,840 14.350 13.830 13.280 12.700 12.090 11.460 6.480 6.440 6.390 6.340 6.270 6.200 6,120 6.030 5.930 5.810 5.680 5.540 5.370 8.610 8.520 8.420 8.310 8.190 8.060 7,920 7.760 7,590 7,400 7.190 6.970 6.720 11.040 10.900 10.740 10.570 10.390 10.190 9.970 9.740 9.480 9.210 8.920 8.610 8.270 4,490 4.460 4.420 4.370 4.320 4.270 4.200 4.130 4.050 3.970 3.870 3.810 3.750 5,410 5,350 5,300 5,270 5.240 5.200 5,160 5.100 5.030 4.960 4.870 4.770 4.650 8.110 8.040 7,950 7.850 7,750 7.630 7.500 7.360 7.200 7.030 6.840 6.640 6.410 3,700 3.680 3.660 3.640 3.610 3.570 3.530 3.490 3.430 3.370 3.300 3,220 3.130 4,690 4.650 4.610 4.560 4.510 4.440 4.370 4,300 4.210 4.140 4.090 4.020 3.950 5.950 5.920 5.880 5.840 5.790 5.740 5.670 5.600 5.510 5.410 5.300 5.180 5.030 7.640 7.580 7.500 7.420 7.320 7.220 7,100 6.980 6.840 6.680 6.510 6.320 6.110 3.640 3.620 3,610 3.580 3,560 3.520 3.490 3.440 3.390 2.340 2.340 2.340 2.340 2,340 2.340 2.340 2.330 2.330 2.310 2.290 2.880 2.880 2.880 2.880 2.870 2.860 2.850 2,830 2.800 2,760 2.720 3.330 3.260 3.190 3.100 2,270 2.230 2,670 2.620