ALMADANI, NADIR FAISAL (2024) OPTIMASI WAKTU PENGOPERASIAN RIG DENGAN MODIFIKASI PLUG PADA TUBING UNTUK PEKERJAAN HYDRAULIC FRACTURING PADA STUDI KASUS SUMUR NDR-6 LAPANGAN SANGASANGA. Masters thesis, UPN Veteran Yogyajarta.
![[thumbnail of Abstrak Ringkasan_Tesis Nadir.pdf]](http://eprints.upnyk.ac.id/style/images/fileicons/text.png) |
Text
Abstrak Ringkasan_Tesis Nadir.pdf Download (183kB) |
|
Text
Cover_Tesis Nadir.pdf Download (150kB) |
|
Text
Daftar Isi_Tesis Nadir.pdf Download (135kB) |
|
Text
Daftar Pustaka_Tesis Nadir.pdf Download (115kB) |
|
Text
Pengesahan_Tesis Nadir.pdf Download (355kB) |
|
Text
Thesis_Nadir_Rev24halamanfixed no sign.pdf Restricted to Repository staff only Download (4MB) |
Abstract
RINGKASAN
Pada tahun 2019-2022 pekerjaan Well intervention cukup masif dilakukan
di Lapangan Sangasanga untuk mempertahankan decline produksi. Salah satu
pekerjaan yang Well intervention adalah fracturing yang dimana pekerjaan ini
membutuhkan proses uji tekanan tubing. Proses tes tekanan tubing dilakukan pada
tekanan tinggi untuk mengetahui kualitas dari tubing. Pada proses tes tekanan
menyebabkan panjangnya waktu pengoperasian rig karena dilakukan dengan
pengelasan bagian bawah tubing untuk mengisolasi backpressure, tubing yang
sudah dites harus dilakukan pull out of hole (POOH) dan Run in Hole (RIH) kembali
dan memakan waktu selama 33 jam, dalam diagram pareto terkait penyebab
dominan didapatkan pekerjaan tes tubing dengan plug konvensional memiliki risk
priority number 80 (dominan).
Metode alternatif Modifikasi plug melibatkan Mandrel pump RW dan cage
top standing valve TH dengan running alat tersebut pada tubing joint pertama untuk
mengisolasi tekanan, saat duduk di pump shoe, cup seating akan menahan pressure
yang diberikan saat tes tubing berlangsung. Modified plug dapat di-retrieve secara
langsung oleh jar, sinker bar dan on-off tools, fishing tools ini akan memberikan
hentakan agar on-off tool dapat latch pada bagian atas standing valve TH untuk
kemudian ditarik ke permukaan saat tubing masih berada di bawah permukaan.
Langkah pertama dengan menentukan kekuatan dari ulir modified plug dan
didapatkan tensile strength 25,425 lbf dimana mampu menahan compressive
strength dari fishing tools sebesar 9,070.4 lbf saat dilakukan latch menggunakan
jar. Langkah kedua dengan menentukan berat yang bekerja pada sistem pengangkat
yaitu berat modified plug, berat fishing tools, berat sandline dengan total berat pada
completion fluid brine sebesar 1,948 lbs di mana kekuatan sandline yang kaan
digunakan dapat ditentukan yaitu diameter rope 9/16” dengan minimum break
strength 27,000 lbs sehingga safety factor cukup besar pada 13.86. Kemudian
dilanjutkan dengan pembuatan design 3D dan pfabrikasi alat untuk dilakukan
prosedur uji pressure di permukaan menggunakan Mandrel dan Cage top pada 2000
psi, di hold selama 30 menit. Setelah berhasil, alat akan di running bersama tubing
dan ditempatkan pada shoe tubing. Uji tekanan dijalankan pada 6,000 psi, ditahan
selama 10 menit dengan maximum penurunan pressure 3% setiap 20 joint tubing.
Modified plug yang diterapkan pada 6 sumur menunjukkan pengurangan
waktu persiapan rata-rata 56% untuk hydraulic fracturing: NDR-6 55% (18 jam),
NDR-5 55% (19 jam), NDR-4 52% (10 jam), NDR-3 54% (13 jam), NDR-2 57%
(28 jam), and NDR-1 55% (18 jam).
Produksi meningkat dengan gain sebesar 70 bopd berdasarkan hasil
fracturing karena ada kenaikan permeabilitas, penurunan nilai skin dan peningkatan
PI dari sebelumnya. Dengan optimasi waktu hydraulic fracturing memberikan
efisiensi preparation sebesar $8,681 karena pekerjaan lebih cepat selesai.
Keberhasilan ini mengakibatkan pengurangan biaya sekitar USD 68,712 dari 6
sumur yang melakukan proses uji tekanan tubing untuk hydraulic fracturing
dengan pay Out time investasi Hydraulic Fracturing sumur NDR-6 selama 53 hari
dari total investasi hydraulic fracturing sebesar USD 322.424
vii
ABSTRACT
In 2019-2022, quite massive well intervention work was carried out at the
Sangasanga Field to maintain production decline. One of the jobs that Well
intervenes is fracturing, which requires a tubing pressure test process. The tubing
pressure test process is carried out at high pressure to determine the quality of the
tubing. The pressure test process causes a long rig operating time because it is
carried out by welding the bottom of the tubing to isolate the backpressure, the
tubing that has been tested must be pulled out of hole (POOH) and Run in Hole
(RIH) again and takes 33 hours, in the diagram Pareto related to the dominant
cause found that tubing test work with conventional plugs has a risk priority number
80 (dominant).
Alternative method Plug modification involves Mandrel pump RW and cage
top standing valve TH by running the tool on the first tubing joint to isolate the
pressure, when sitting on the pump shoe, the seating cup will withstand the pressure
applied during the tubing test. The modified plug can be retrieved directly by the
jar, sinker bar and on-off tools. This fishing tool will provide a jolt so that the on-
off tool can latch on to the top of the TH standing valve and then be pulled to the
surface while the tubing is still below the surface.
The first step was to determine the strength of the modified plug thread and
obtained a tensile strength of 25,425 lbf which was able to withstand the
compressive strength of fishing tools of 9,070.4 lbf when latched using a jar. The
second step is to determine the weight that works on the lifting system, namely the
weight of the modified plug, the weight of the fishing tools, the weight of the
sandline with a total weight of the completion fluid brine of 1.948 lbs where the
strength of the sandline that will be used can be determined, namely a rope diameter
of 9/16” with a minimum brake strength is 27,000 lbs so the safety factor is quite
large at 13.86. Then proceed with making a 3D design and fabricating the tool to
carry out a pressure test procedure on the surface using a Mandrel and Cage top
at 2000 psi, held for 30 minutes. Once successful, the tool will be run along with
the tubing and placed on the tubing shoe. The pressure test was carried out at 6,000
psi, held for 10 minutes with a maximum pressure drop of 3% for every 20 tubing
joints.
Modified plugs applied to 6 wells showed an average reduction in
preparation time of 56% for hydraulic fracturing: NDR-6 55% (18 hours), NDR-5
55% (19 hours), NDR-4 52% (10 hours), NDR-3 54% (13 hours), NDR-2 57% (28
hours), and NDR-1 55% (18 hours).
Production increased with a gain of 70 bopd based on fracturing results due
to an increase in permeability, a decrease in skin value and an increase in PI from
before. Optimizing hydraulic fracturing time provides preparation efficiency of
$8,681 because the work is completed more quickly. This success resulted in a cost
reduction of around USD 68,712 from 6 wells that carried out the tubing pressure
test process with a pay out time for the NDR-6 well Hydraulic Fracturing
investment of 53 days from a total hydraulic fracturing investment of USD 322,424
viii
| Item Type: | Thesis (Masters) |
|---|---|
| Subjects: | T Technology > T Technology (General) |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Eko Yuli |
| Date Deposited: | 04 Jan 2024 04:36 |
| Last Modified: | 04 Jan 2024 04:36 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/38575 |
Actions (login required)
 |
View Item |