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ITS » Master Theses » Teknik Kes & Keselamatan Kerja
Posted by eko at 08/01/2007 15:46:53  •  5676 Views


STUDI PENGARUH LAJU PENETRASI PENGEBORAN TERHADAP PENCEGAHAN SEMBURAN LIAR GAS DANGKAL

STUDY ON THE EFFECT OF DRILLING PENETRATION RATE ON THE BLOW OUT PREVENTION TN SHALLOW GAS WELLS

Author :
Mudofir, Achmad  




ABSTRAK

Blowout atau semburan liar merupakan peristiwa kecelakaan yang berbahaya karena menyemburnya gas bumi yang tidak terkendali kepermukaan tanah saat pengeboran berlangsung. Upaya melakukan pencegahan terjadinya semburan liar gas dangkal selama ini adalah dengan cara memprediksi letak kedalaman lapisan gas dangkal untuk pedoman pengebor memulai bersikap waspada dan memprediksi tekanan lapisan untuk menentukan density lumpur yang dipergunakan. Tetapi cara ini masih belum efektif. Hal ini terbukti masih sering terjadi peristiwa semburan liar. Penelitian ini menawarkan suatu metoda mencegah semburan liar gas dangkal dengan mengontrol density lumpur efektif yang terjadi diannulus saat sedang mengebor dengan cara mengendalikan laju penetrasi secara terus menerus. Pengendalian didasarkan pada perumusan bentuk matematis density lumpur yang terbentuk di annulus lubang bor. Kriteria pengendalian yang dipergunakan Pengaruh penurunan tekanan dasar lubang bor jangan sampai lebih kecil dari tekanan formasi akibat pengembangan gas yang keluar dari pori-pori serbuk bor Kenaikan density lumpur nyata karena keberadaan serbuk bor yang dibawa lumpur agar jangan sampai menyebabkan pecah formasi dibawah casing shoe dan dapat menimbulkan semburan gas. Dari perumusan yang didapat kemudian diwujudkan dalam bentuk software untuk keperluan kecepatan perhitungan di lapangan. Uji performasi software dengan data riil pengeboran Sumur X Kalimantan diketahui bahwa semburan gas dikedalaman 400 ft terjadi akibat laju penetrasi pengeboran pada saat itu rata-rata 74 ftjam adalah melebihi laju penetrasi maksimum yang diijinkan yaitu 7116 ftjam. Sedangkan semburan liar saat mengebor zone dibawah zone gas adalah karena laju penetrasi saat itu rata-rata 120 ft jam adalah lebih tinggi dari laju penetrasi maksimum yang diijinkan yaitu 10531 ftjam. Sehingga dengan adanya hasil penelitian berupa software ini diharapkan dapat dipergunakan di operasi pengeboran minyak dan gas bumi dilokasi darat yang memiliki potensi bahaya semburan gas dangkal


ABSTRACT

Blowout is a dangerous event since it is an uncontrolled flow of natural gas to the surface during drilling operation. Up to now the attempt to prevent shallow gas blowout is done by estimating the depth of the shallow gas layers which will give guidance to driller of when should he start to be alert and estimating the formation pressure to determine the mud density should be used. However this technique is not effective yet as evidenced by the frequent occurrence of blowout. This research offers a method to prevent shallow gas blowout by controlling effective mud density in the annulus during drilling through controlling penetration rate continuously. The control is based on a mathematical formulation of drilling mud density change in the annulus. The control criteria used are 9632 The bottom hole pressure decrease caused by the expansion of gas bubbling out from the formation pores should not be lower than the formation pressure. 9632 The increase in actual mud density caused by cuttings carried by the mud should not be high enough to cause fracture of formation below the casing shoe which may generate gas blowout. The formula obtained is then transferred into a software package to enhance calculation speed in the field The software performance test using real drilling data of well X Kalimantan showed that the gas blowout from 400 ft deep was caused by the average drilling penetration rate of 74 fthour which was higher than the maximum allowable penetration rate of 71.16 fthour. While the blowout occurred during drilling the zone below the gas zone was caused by the average penetration rate of 120 fthour which was higher than the maximum allowable penetration rate of 105.31 fthour. This research based software is hopefully can be used in onshore oil and gas drilling which has potential of shallow gas blowout.



Keywordslaju penetrasi pemboran; density lumpur; tekanan fluida formasi; tekanan rekah formasi
 
Contributor
  1. Dr. Ir. Agus Sigit Pramono, DEA
Date Create: 08/01/2007
Type: Text
Format: Pdf; 152 pages
Language: Indonesian
Identifier: ITS-Master-3100006026089
Collection ID: 3100006026089
Call Number: 622.24 Mud s-1


Source
Theses Employment Engineering RTM 622.24 Mud s-1, 2005

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