EVALUASICHANNELINGPADASEMENDIINTERVAL PERFORASIDENGANMETODEULTRASONICIMAGER TOOL(USIT) LOG PADASUMURANB-04LAPANGAN NABEL

BELYNI, AWALLIYAH NADIA (2025) EVALUASICHANNELINGPADASEMENDIINTERVAL PERFORASIDENGANMETODEULTRASONICIMAGER TOOL(USIT) LOG PADASUMURANB-04LAPANGAN NABEL. Tesis thesis, UPN Veteran Yogyakarta.

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Abstract

RINGKASAN
Channeling pada semen di interval perforasi yang terjadi pada Sumur
ANB-04 Lapangan NABEL pada formasi CD Carbonate B dan CD Carbonate C
dengan litologi dominan limestone dan claystone serta kandungan gas CO2
sebesar 3.035%. Beberapa faktor yang menyebabkan channeling yaitu diantaranya
perencanaan penyemenan yang buruk, laju pemompaan (pump rate) yang tidak
tepat, dan waktu pumping yang tidak tepat (thickening time).
Pada evaluasi channeling semen di interval perforasi dilakukan dengan
melakukan perencanaan volume penyemenan, kemudian dihitung laju
pemompaan (pump rate) dan thickening time, dan dilakukan analisa dan evaluasi
data primery cementing dan kualitas semen berdasarkan USIT Log.
USIT log dapat secara efektif dan akurat mengidentifikasi keberadaan
serta karakterisasi channeling pada semen di belakang casing. Dari gambar 2D
terjadi horizontal channeling dari kedalaman 10350-10575 ftMD pada casing
joint nomor 10-16 menunjukkan kualitas bonding cement yang buruk (poor
bonding) dan vertical channeling 3D mulai dari kedalaman 10590-10605 ftMD
pada casing joint nomor 10 dan 10790-10800 ftMD pada casing joint nomor 5
menunjukkan kualitas bonding cement yang buruk (poor bonding). Pada
penyemenan 4-1/2” liner ini berdasarkan gambar 3D terlihat hubungan antara
vertical channeling dan horizontal channeling, sehingga penyemenan dari bawah
(water zone) terkoneksi channeling dengan bagian atas penyemenan (water zone),
yang berpotensi terjadinya aliran air dari zona air ke perforasi minyak, yang
berpotensi menjadikan water cut yang tinggi saat awal produksi.
Kata Kunci: Channeling, USIT Log, Bonding Cement
xiii
ABSTRACT
Channeling in the cement at the perforation interval in Well ANB-04,
located in the NABEL Field, occurred in the CD Carbonate B and CD Carbonate
C formations, which are predominantly composed of limestone and claystone,
with a CO₂ gas content of 3.035%. Several factors contributed to the channeling,
including poor cementing design, inappropriate pump rate, and incorrect
pumping time (thickening time).
The evaluation of cement channeling in the perforation interval involved
planning the cement volume, calculating the pump rate and thickening time,
followed by analysis and evaluation of primary cementing data and cement
quality based on the USIT log.
The USIT log can effectively and accurately identify the presence and
characterize the nature of channeling in the cement behind the casing. From the
2D image, horizontal channeling is observed from a depth of 10350-10575 ftMD
at casing joints number 10-16, indicating poor cement bonding quality.
Additionally, 3D vertical channeling is observed from a depth of 10590-10605
ftMD at casing joint number 10, and from 10790-10800 ftMD at casing joint
number 5, both indicating poor cement bonding quality. In the cementing of the 4
1/2” liner, the 3D image shows a connection between the vertical and horizontal
channeling, revealing that the cement from the lower section (water zone) is
connected to the upper part of the cement (water zone) through channeling. This
condition has the potential to cause water flow from the water zone to the oil
perforation zone, which may result in a high water cut during early production.
Keywords: Channeling, USIT Log, Bonding Cement
xiv

Item Type:	Tugas Akhir (Tesis)
Uncontrolled Keywords:	Channeling, USIT Log, Bonding Cement
Subjek:	T Technology > T Technology (General)
Divisions:	Fakultas Teknologi Mineral dan Energi > (S2) Magister Teknik Perminyakan
Depositing User:	Eko Yuli
Date Deposited:	07 Oct 2025 01:55
Last Modified:	07 Oct 2025 01:55
URI:	http://eprints.upnyk.ac.id/id/eprint/44100

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