TUGAS WORKOVER

Dosen Pembimbing : Idham khalid,ST.MT

Oleh :

Nama : Zano Ayoka S

NPM : 123210348

Kelas : VI B

JURUSAN PERMINYAKAN

FAKULTAS TEKNIK

UNIVERSITAS ISLAM RIAU

T.A. 2014/2015

TUGAS

Casing Data:

Prod. Csg = 7”

Int. Csg = 9.625”

Capacity:

Cap.Int. Casing = 9.625” , 0.0745 bbl/ft

Cap.Prod. Casing = 7” , 0.0394 bbl/ft

Cap.ann. 7” csg x 3.5” tbg = 0.0275 bbl/ft

Cap.ann. 9.625” csg x 3.5” tbg = 0.0629 bbl/ft

Cap.ann Bit 9-7/8” x 7” csg = 0.0471 bbl/ft

Cap.ann Bit 12 ¼” x 9.625” csg = 0.0058 bbl/ft

Penyelesaian :

1. Untuk swadge @2200

Open Ended Squeeze Method Casing Swadge

Cement calculation

Volume casing from OE to top perforation

= (OE– top_perf) * cap.casing

= (2364 – 2150) * 0.0394 = 8.43 bbls

Volume Casing 100 ft above top perforation

= (Top_perf – Swadge_depth) * cap.casing + Remaining depth * cap.casing

= (2150 – 2200) * 0.0394+ [(100 – (2150- 2200)) * 0.0745]

= -1.97 + 11.175 = 9 bbls

Volume behind casing

= Length of perf * Cap.Ann.OH_Casing

= 50 * 0.0471 = 2.35 bbls

100% Excess cement = 2.35 bbls

Volume for Hesitation = 9 bbls

Total cement volumes = 8.43 + 9 + 2.35 + 2.35+ 9 = 31.13 bbls

Number of sack required

= Total cement volumes(bbl)*5.615(cuft/bbl)/1.16(cuft/sax)

= 31.13 * 5.615 / 1.16 = 150.7 sax ≈ 151 sax

Volume of water required

Volume of Water = Number of Sax (sax)*4.93(gal/sax)/42(gal/bbl)

= 151 * 4.93 / 42 = 17.7 bbls

Volume of displacement water

Displacement water = (TOC – 50) * cap.tbg

Top of cement for no slurry enter into formation, TOC

- Vol 7” casing = ( OE – Swadge depth) * (cap.tubing + cap.ann.tbg-csg)

= (2364 – 2200) * (0.0087 + 0.0275) = 5.94 bbls

- Cement in 9.625” casing = (slurry used – cement in 7” casing)

= 31.13 bbls – 5.94 = 25.19 bbls

TOC@9 5/8”csg = Swadge depth – [cement in 9 5/8”/(cap.tbg+cap.ann.tbg-csg)]

= [2200 – (25.19 / (0.0087 + 0.0629)] = 1848 ft

Displacement Water = (1848 ft – 50 ft) * 0.0087 bbl/ft = 15.6 bbls

Packer Squeeze Method Casing Swadge

Cement calculation

Volume casing from bottom to top perforation

= (bottom_perf – top_perf) * cap.casing

= (2364 – 2150) * 0.0394 = 8.43 bbls

Total cement volumes 8.43 + 9 + 2.35 + 2.35+ 9 = 31.13 bbls

Number of sack required

= Total cement volumes(bbl)*5.615(cuft/bbl)/1.16(cuft/sax)

= 31.13 * 5.615/ 1.16 = 150.7 sax ≈ 151 sax

Volume of water Required

Volume of Water = Number of Sax (sax)*4.93(gal/sax)/42(gal/bbl)

= 151 * 4.93 / 42 = 11.7bbls

Volume of Displacement water

Displacement water = (TOC – 50) * cap.tbg

Top of cement for no slurry enter into formation, TOC

- Vol 7” casing = ( Bottom_perf – Swadge depth) * cap.casing

= (2364 – 2200) * 0.0394 = 6.46 bbls

- Cement in 9.625” casing = (slurry used – cement in 7” casing)

= 31.13 bbls – 6.46 = 24.67 bbls

TOC @ 9 5/8” csg = [Swadge depth – (cement in 9 5/8” / cap.casing)]

= [2200 – (24.67 / 0.0745)] = 1869 ft

Displacement Water = (1869 ft – 50 ft) * 0.0087 bbl/ft = 16 bbls

2. Untuk swadge @1750

Open Ended Squeeze Method Casing Swadge

Cement calculation

Volume casing from OE to top perforation

= (OE– top_perf) * cap.casing

= (2364 – 1600) * 0.0394 = 30.1 bbls

Volume Casing 100 ft above top perforation

= (Top_perf – Swadge_depth) * cap.casing + Remaining depth * cap.casing

= (1600 – 1750) * 0.0394+ [(100 – (1600- 1750)) * 0.0745]

= -5.91 + 111.175 = 105 bbls

Volume behind casing

= Length of perf * Cap.Ann.OH_Casing

= 70 * 0.0471 = 3.29 bbls

100% Excess cement = 3.29 bbls

Volume for Hesitation = 105 bbls

Total cement volumes = 30.1 + 105 + 3.29 + 3.29+ 105 = 246.68 bbls

Number of sack required

= Total cement volumes(bbl)*5.615(cuft/bbl)/1.16(cuft/sax)

= 246.68 * 5.615 / 1.16 = 1194 sax

Volume of water required

Volume of Water = Number of Sax (sax)*4.93(gal/sax)/42(gal/bbl)

= 1194 * 4.93 / 42 = 140.15 bbls

Volume of displacement water

Displacement water = (TOC – 50) * cap.tbg

Top of cement for no slurry enter into formation, TOC

- Vol 7” casing = ( OE – Swadge depth) * (cap.tubing + cap.ann.tbg-csg)

= (2364 – 1750) * (0.0087 + 0.0275) = 22.23 bbls

- Cement in 9.625” casing = (slurry used – cement in 7” casing)

= 246.68 bbls – 22.23 = 226.45 bbls

TOC@9 5/8”csg = Swadge depth – [cement in 9 5/8”/(cap.tbg+cap.ann.tbg-csg)]

= [1750 – (226.45 / (0.0087 + 0.0629)] = -1413 ft

Displacement Water = (-1413 ft – 50 ft) * 0.0087 bbl/ft = 11.8 bbls

Packer Squeeze Method Casing Swadge

Cement calculation

Volume casing from bottom to top perforation

= (bottom_perf – top_perf) * cap.casing

= (2364 – 1600) * 0.0394 = 30.1 bbls

Total cement volumes 30.1 + 105 + 3.29 + 3.29+ 105 = 246.68 bbls

Number of sack required

= Total cement volumes(bbl)*5.615(cuft/bbl)/1.16(cuft/sax)

= 264.68 * 5.615/ 1.16 = 1194 sax

Volume of water Required

Volume of Water = Number of Sax (sax)*4.93(gal/sax)/42(gal/bbl)

= 1194 * 4.93 / 42 = 140 bbls

Volume of Displacement water

Displacement water = (TOC – 50) * cap.tbg

Top of cement for no slurry enter into formation, TOC

- Vol 7” casing = ( Bottom_perf – Swadge depth) * cap.casing

= (2364 – 1750) * 0.0394 = 24.19 bbls

- Cement in 9.625” casing = (slurry used – cement in 7” casing)

= 264.68 bbls – 24.19 bbls = 240.49 bbls

TOC @ 9 5/8” csg = [Swadge depth – (cement in 9 5/8” / cap.casing)]

= [1750 – (240.49 / 0.0745)] = -1478 ft

Displacement Water = (1478 ft – 50 ft) * 0.0087 bbl/ft = 12 bbls