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Perawatan sumur bor sangat diperlukan pada operasi pemboran, salah
satunya adalah penutupan zona perforasi. Hal ini dilakukan agar tidak terjadi
lost circulation pada sumur. Selain itu penutupan zona perforasi sangat
dipengaruhi dengan perhitungan volume dan kebutuhan semen yang akan
digunakan. Pada penelitian ini penutupan zona perforasi berfokus menggunakan
metode dual stage cementing, dimana metode ini digunakan untuk penutupan
zona perforasi untuk zona 1 dan zona 2.
Stage cementing atau penyemenan bertingkat adalah penyemenan yang
dilakukan dalam dua atau tiga bagian. Teknik ini biasanya digunakan pada
production casing dari sumur-sumur yang dalam atau dilakukan bila formasinya
lemah sehingga dikhawatirkan tidak mampu menahan tekanan kolam semen,
sehingga dapat menghindari terjadinya lost circulation. Teknik ini diterapkan
apabila menurut pertimbangan teknis dan ekonomis, lebih menguntungkan.
Perhitungan volume cement slurry stage 1 didapatkan nilai sebesar
438.666 bbl dan jumlah sack cement didapatkan nilai 1569.859 sack.
Perhitungan volume cement slurry stage 2 didapatkan nilai 54 bbl dan jumlah
sack cement didapatkan nilai 193.250 sack. perhitungan jumlah additif pada
stage 1, untuk jumlah defoamer didapatkan hasil sebesar 106.750 gal, fluida
loss sebesar 649.921 gal, anti-gas migration sebesar 45.525 gal, dispersant
45.525 gal, dan retarder sebesar 67.503 gal. pada perhitungan jumlah additife
pada stage 2, didapatkan hasil deafoamer sebesar 13.141gal, fluid loss sebesar
248.712 gal, anti-gas migration sebesar 80.005 gal, retarder sebesar 5.60 gal,
dan retander 7.395 gal

Drilling well maintenance is verynecessary in drilling operation, one of which
is closing the perforation zone. In addition, the clouser of the perforation zone is
greatly influenced of the volume and demand for cement to be used.In this
study, the clouser of the perforation zone focuses on using the dual stage
cementing method, where this method is used for closing the perforation zone
for zone 1 and zone 2.
Stage cementing is cementing that is carried out in two or three parts.
This technique is usually used in production casing from deef wells or when the
formation is weak so it is feared that it will not be able to withstand the pressure
of the cement pond, so as to avoid lost circulation. This technique is applied if
according to technical and economic considerations, it is more profitable.
Calculation of the volume of cement stage 1 obtained a value of 438,666 bbl
and the number of sack cement obtained a value of 1569,859 sacks. Calculation
of the volume of cement slurry stage 2 obtained a value of 54 bbl and the
number of sack cement obtained a value of 193,250 sackc. The calculation of
the amount of additives in stage 1, for the amount of defomer the results are
106,750 gal, fluid loss of 649,921 gal, anti- gas migration of 45,525 gal,
dispersant 45,525 gal and retarder of 67,503 gal.
On the amount of dditives in stage 2, the results obtained are 13,141 gal,
deafoamer 248,712, gal, fluid loss 80,005 gal, anti- migration 5,60 gal, retarder
and 7395 gal retarder.