Ujian akhir semester teknik produksi migas

Sucker Rod Pump (SRP) atau pompa angguk merupakan salah satu metode artificial lift dengan memanfaatkan sumber tenaga yang berupa listrik atau gas dari prime mover untuk menggerakkan pompa sehingga fluida pada formasi dapat naik ke permukaan.Untuk menyusun perencanaan pompa Sucker Rod Pump, kita perlu menghitung kemampuan produksi sumur (meliputi SGf, Gf, Ps, Pwf, PI, Qmax, Qoptimum, dan Qo), menghitung letak kedalaman pompa, perencanaan ukuran rod, perencanaan jenis dan ukuran pumping unit, pump intake pressure, plunger stroke effective, faktor beban polished rod, nilai torsi, pump displacement dam efficiency volumetric, dan perencanaan prime mover.

1. Kemampuan Sumur ProduksiSGf= WC x SGw + (1-WC) x SGo= 0,54 x 1,03 + (1-0,54) x 0,8409= 0,54 x 1,03 + (0,46) x 0,8409= 0,943Gf = 0,433 x SGf= 0,433 x 0,943= 0,408

Ps= = = 306,7Pwf = = = 134,2Q max = = = 375,3Q optimum= 0,8 x Q max= 0,8 x 375,31= 300,25Qo = (1 WC) x Q optimum= (1 0,54) x 300,25= 138,112. Kedalaman PompaPSD = TP 100= 853,08 100= 753,08 ft

3. Perencanaan Ukuran RodLr = PSD= 753,08 ftWr= Wra x Lr= 1,63 x 753,08= 1227,52 lb

IF =

SLNIF

(asumsi)(asumsi)

14431.0184

14441.0327

14451.0511

14461.0735

10031.0128

10041.0227

10051.0355

10061.0511

10071.0695

10081.0908

5461.0276

5471.0375

5481.0490

5491.0620

54101.0766

54111.0927

54121.1103

4281.0381

4291.0483

42101.0596

42111.0721

42121.0858

42131.1007

42141.1168

42151.1340

Hitung beban Rod (RL) untuk setiap ukuranRL = Wf + (Wr x IF)Keterangan:Wf = berat fluidaWr = Berat RodData IF didapatkan dari Tabel No. 18SLNRL

(asumsi)(asumsi)Lb

14432349.711

14442367.262

14452389.827

14462417.407

10032342.816

10042355.004

10052370.675

10062389.827

10072412.463

10082438.58

5462360.994

5472373.217

5482387.32

5492403.304

54102421.168

54112440.913

54122462.538

4282373.948

4292386.38

42102400.274

42112415.631

42122432.451

42132450.733

42142470.478

42152491.686

SR = Ar = Luas rod, in2= 0,442 in2 SLNRLSR

(asumsi)(asumsi)LbPsia

14632349.7115316.0883

14642367.2625355.7963

14452389.8275406.8494

14462417.4075469.2477

10032342.8165300.4887

10042355.0045328.0637

10052370.6755363.5173

10062389.8275406.8494

10072412.4635458.0601

10082438.585517.1494

5462360.9945341.6148

5472373.2175369.2686

5482387.325401.1768

5492403.3045437.3395

54102421.1685477.7565

54112440.9135522.428

54122462.5385571.3539

4282373.9485370.9231

4292386.385399.0496

42102400.2745430.4851

42112415.6315465.2296

42122432.4515503.2831

42132450.7335544.6456

42142470.4785589.317

42152491.6865637.2975

Keterangan:K = 90.000Wra = 1,63 (3/4)SF =1 (WC x 0,1) = 0,946SR max = (0,25 x T + 0,7166 x Wr x (1,875 IF)) x SFSLNSR max

(asumsi)(asumsi)Psia

146321997.83

146421985.93

144521970.63

144621951.93

100322002.5

100421994.24

100521983.61

100621970.63

100721955.29

100821937.58

54621990.18

54721981.89

54821972.33

54921961.49

541021949.38

541121936

541221921.34

42821981.4

42921972.97

421021963.55

421121953.14

421221941.74

421321929.34

421421915.96

421521901.58

4. Jenis dan Ukuran Pumping Unit Tentukan asumsi dari kecepatan pemompaan (N)SL (Asumsi)N (Asumsi)

1443 5

1003 7

547 11

428 14

Kurva N vs Pd

Kurva IPR vs Kurva N dan PdTABEL I. 1Contoh Spesifikasi Pumping UnitNoPumping UnitPeak Torque(lb-in)Polished rod(lb)SL(in)

12345C 40D 57 39C 57D 89 42C 114D 133 54C 320D 256 100C 640D 356 144400005700011400032000064000057008900133002560035600394254100144

5. Pump Intake PressurePwf*= 0,125 x Ps x [-1 + {81-80 x ( ]= 0,125 x 306,70 x [-1 + {81 80 x (]= 119,73 psia

PIP= Pwf* - {(} x Gf= 119,73 - {(} x 0,4083= 77,05 psi

May 7, 2015Ujian akhir semester teknik produksi migas

6. Plunger Stroke Effective

ep = 1,41 x (IF -1) x (Lr = Panjang Rod (ft)Lr = PSD = TP -100= 853,08 -100 = 753,08 ftSLNEp

(asumsi)(asumsi)In

14430.0147

14440.0261

14450.0408

14460.0588

10030.0102

10040.0181

10050.0284

10060.0408

10070.0556

10080.0726

5460.0220

5470.0300

5480.0392

5490.0496

54100.0612

54110.0741

54120.0882

4280.0305

4290.0386

42100.0476

42110.0576

42120.0686

42130.0805

42140.0934

42150.1072

er = (12 xx(Wf = Weight of fluida = 0,433 x SGF x Lr x Ap = 1099,63 lbE = Modulus Young = 3 x 107Ar = Luas permukaan rod (inch2) = 0,442 inch2Lr = PSD = TP -100 = 853,08 -100 = 753,08 ftSLNEr

(asumsi)(asumsi)In

14430.7494

14440.7494

14450.7494

14460.7494

10030.7494

10040.7494

10050.7494

10060.7494

10070.7494

10080.7494

5460.7494

5470.7494

5480.7494

5490.7494

54100.7494

54110.7494

54120.7494

4280.7494

4290.7494

42100.7494

42110.7494

42120.7494

42130.7494

42140.7494

42150.7494

et = 15,2727 x Dt = diameter tubing (inch) = 2 7/8 inchE = Modulus Young = 3 x 107Lr (Panjang Rod)= PSD = TP -100= 853,08 -100 = 753,08 ftSLNEt

(asumsi)(asumsi)In

14430.0510

14440.0510

14450.0510

14460.0510

10030.0510

10040.0510

10050.0510

10060.0510

10070.0510

10080.0510

5460.0510

5470.0510

5480.0510

5490.0510

54100.0510

54110.0510

54120.0510

4280.0510

4290.0510

42100.0510

42110.0510

42120.0510

42130.0510

42140.0510

42150.0510

Sp (Inch) = SL + ep (er +et)SL = Panjang langkah , (inch)ep= Plunger Over Travel (in)er= Rod Strange (inch)et= Tubing Stretch (inch)SLNSp

(asumsi)(asumsi)In

1443143.2143

1444143.2257

1445143.2404

1446143.2584

100399.2098

100499.2177

100599.2279

100699.2404

100799.2552

100899.2722

54653.2216

54753.2296

54853.2388

54953.2492

541053.2608

541153.2737

541253.2878

42841.2301

42941.2382

421041.2472

421141.2572

421241.2682

421341.2801

421441.2930

421541.3068

7. Faktor Beban Polished Rod: PPRL = Wf + ( Wr x IF )Keterangan : PPRL = beban maksimal rod ( lb )Wf = berat fluida ( lb )Wr = berat rod ( lb )IF = Impuls Factor

IFPPRL(lb)

1.01842349.71

1.03272367.26

1.05112389.83

1.07352417.41

1.01282342.82

1.02272355.00

1.03552370.67

1.05112389.83

1.06952412.46

1.09082438.58

1.02762360.99

1.03752373.22

1.04902387.32

1.06202403.30

1.07662421.17

1.09272440.91

1.11032462.54

1.03812373.95

1.04832386.38

1.05962400.27

1.07212415.63

1.08582432.45

1.10072450.73

1.11682470.48

1.13402491.69

Wf = 1099,63 lb Wr = 1227,52 lbMPRL = Wr x (1,875 IF )Keterangan : MPRL = beban minimal rod ( lb ) Wr = beban rod (lb ) IF = Impuls FactorIFMPRL

Lb

1.01841051.51

1.03271033.96

1.05111011.40

1.0735983.82

1.01281058.41

1.02271046.22

1.03551030.55

1.05111011.40

1.0695988.76

1.0908962.65

1.02761040.23

1.03751028.01

1.04901013.91

1.0620997.92

1.0766980.06

1.0927960.31

1.1103938.69

1.03811027.28

1.04831014.85

1.05961000.95

1.0721985.59

1.0858968.77

1.1007950.49

1.1168930.75

1.1340909.54

Dengan : Wr = 1227,52 lb

8. Nilai Torsi TP = 0,5 x SL x(PPRL CBeff) Keterangan : TP = nilai torsi ( lb )SL = panjang langkah ( inch )PPRL = beban maksimal rod (lb) Cbeff = counter balance effective, lb

CBeff = Wr + Cbeff = counter balance effective, lbWr = berat rod ( lb )CBF = Counter Balance Factor

SLPPRLCB effTP

(asumsi)lblb in

1442349.711594.0654406,72

1442367.261594.0655670,39

1442389.831594.0657295,10

1442417.411594.0659280,87

1002342.821594.0637437,70

1002355.001594.0638047,10

1002370.671594.0638830,63

1002389.831594.0639788,27

1002412.461594.0640920,02

1002438.581594.0642225,90

542360.991594.0620707,15

542373.221594.0621037,17

542387.321594.0621417,97

542403.301594.0621849,53

542421.171594.0622331,87

542440.911594.0622864,98

542462.541594.0623448,86

422373.951594.0616377,60

422386.381594.0616638,67

422400.271594.0616930,46

422415.631594.0617252,96

422432.451594.0617606,17

422450.731594.0617990,10

422470.481594.0618404,74

422491.691594.0618850,09

Dengan : Wf = 1099,63 lb Wr = 1227,52 lb9. Pump Displacement dam Efficiency VolumetricPD = K x SP x N Keterangan : PD = pump displacement (bfpd ) SP = Plunger stroke efektif ( inch ) K = konstanta plunger N = Kecepatan pemompaan SLNSpKPd

(asumsi)(asumsi)inBfpd

1443143.21430.59253.4893

1444143.22570.59338.0127

1445143.24040.59422.5592

1446143.25840.59507.1347

100399.20980.59175.6013

100499.21770.59234.1538

100599.22790.59292.7224

100699.24040.59351.3111

100799.25520.59409.9238

100899.27220.59468.5646

54653.22160.59188.4046

54753.22960.59219.8382

54853.23880.59251.2870

54953.24920.59282.7532

541053.26080.59314.2389

541153.27370.59345.7463

541253.28780.59377.2775

42841.23010.59194.6059

42941.23820.59218.9747

421041.24720.59243.3586

421141.25720.59267.7594

421241.26820.59292.1787

421341.28010.59316.6183

421441.29300.59341.0798

421541.30680.59365.5649

Ev = %Keterangan : Ev = Effisiensi Volumetris Pompa Qopt = Laju produksi optimal (bfpd)PdEvQopt

Bfpd%bfpd

253.4893118.45300.2469

338.012788.83300.2469

422.559271.05300.2469

507.134759.20300.2469

175.6013170.98300.2469

234.1538128.23300.2469

292.7224102.57300.2469

351.311185.46300.2469

409.923873.24300.2469

468.564664.08300.2469

188.4046159.36300.2469

219.8382136.58300.2469

251.2870119.48300.2469

282.7532106.19300.2469

314.238995.55300.2469

345.746386.84300.2469

377.277579.58300.2469

194.6059154.28300.2469

218.9747137.11300.2469

243.3586123.38300.2469

267.7594112.13300.2469

292.1787102.76300.2469

316.618394.83300.2469

341.079888.03300.2469

365.564982.13300.2469

10. Perencanaan Prime MoverP = Keterangan : PSD = panjang rod SL = panjang langkah ( inch ) K = konstanta plungerSLNKPSDPMFP

(asumsi)(asumsi)HP

14430.59753.08112.92.26

14440.59753.08112.93.01

14450.59753.08112.93.76

14460.59753.08112.94.52

10030.59753.08112.91.57

10040.59753.08112.92.09

10050.59753.08112.92.61

10060.59753.08112.93.14

10070.59753.08112.93.66

10080.59753.08112.94.18

5460.59753.08112.91.69

5470.59753.08112.91.98

5480.59753.08112.92.26

5490.59753.08112.92.54

54100.59753.08112.92.82

54110.59753.08112.93.10

54120.59753.08112.93.39

4280.59753.08112.91.76

4290.59753.08112.91.98

42100.59753.08112.92.20

42110.59753.08112.92.41

42120.59753.08112.92.63

42130.59753.08112.92.85

42140.59753.08112.93.07

42150.59753.08112.93.29

2. Rekomendasi yang dapat diambil berdasarkan Kurva IPR vs Kurva N dan Pd yang ada adalah dengan menggunakan jenis pompa C-640D-356-144

Contoh penulisan pompa bawah permukaan menurut standar API menggunakan kode sebagai berikut :

Code ; 25 - 225 - THC - 11 - 4 - 4Kelompok; [1] [2] [3] [4] [5] [6] Dalam bilangan angka ataupun hurup menjelaskan suatu ukuran ataupun jenis dari perangkat pompa tersebut, seperti pada tabel di bawah ini:KelompokBilanganMenyatakan Ukuran

[1][2][4][5][6]252251144Ukuran tubing, 2 7/8 in ODDiameter pompa, 2 inPanjang barrel pompa, 11 ftPanjang nominal plunger, 4 ftPanjang extention, 4 ft

KelompokHurufMenyatakan jenis

[3]THCJenis pompa : Tubing TypeJenis barrel : Heavy wall barrelJenis seating : Cup type