The Effect Of Matrix Acidizing On The Compressive Strength Of Sandstone Formation
DOI:
https://doi.org/10.11113/jt.v56.909Abstract
Artikel ini membincangkan kesan pengasidan matriks terhadap kekuatan mampatan sebuah formasi baru pasir. Kajian makmal terbabit melibatkan dua sistem utama, perkakasan pengasidan–kebolehtelapan dan kelengkapan hidraul servo. Asid lumpur dengan kepekatan HF 1–9% telah digunakan untuk merawat sampel teras batu pasir Berea yang rosak. Rawatan ini melibatkan tekanan suntikan dari 30 psi (206 KN/m2) hingga 660 psi (4550 KN/m2) pada suhu bilik. Sampel teras batu pasir Berea pada asalnya dirosakkan menerusi penggunaan lumpur gerudi sebelum bermulanya kerja–kerja pengasidan matriks. Selepas berakhirnya proses pengasidan, nilai kebolehtelapan tertingkat sampel teras yang telah dirawat menggunakan asid lumpur dibandingkan dengan kebolehtelapan rosak, yang diukur menggunakan perkakasan pengasidan–kebolehtelapan. Kekuatan mampatan formasi batu pasir selepas pengasidan juga dinilai menggunakan kelengkapan hidraul servo. Hasil kajian menunjukkan bahawa pengasidan berupaya meningkatkan kebolehtelapan sampel teras yang rosak, tetapi akan menjejaskan kekuatan mampatan sampel teras terbabit, lebih–lebih lagi jika menggunakan 9% HF–12% HCl. Isi padu asid lumpur yang digunakan untuk mencapai ARC 1.0 berkurang bila meningkatnya tekanan suntikan, tetapi tekanan terbabit mesti lebih besar daripada 30 psi (206 KN/m2) untuk mencapai nilai ARC yang lebih besar daripada 1.0. Tekanan suntikan yang terlalu tinggi boleh mengurangkan keberkesanan pengasidan secara menyeluruh berikutan masa tindak balas yang terhad. Kata kunci: Sampel teras batu pasir Berea; kekuatan mampatan; pengasidan matriks; kebolehtelapan This paper discusses the effect of matrix acidizing on the compressive strength of a sandstone formation. The laboratory works involved two main systems, namely the acidizing–permeability apparatus and servo hydraulic equipment. The mud acid with 1–9% HF concentrations was used to treat the damaged Berea sandstone core samples using different injection pressures ranging from 30 psi (206 KN/m2) to 660 psi (4550 KN/m2) at room temperature. The Berea sandstone core sample was initially damaged using drilling mud before the matrix acidizing took place. After the acidizing process, the value of improved permeability of the acidized core sample was compared with the damaged permeability, which was measured using the acidizing-permeability apparatus. The compressive strength of sandstone formation after the acidizing process was also evaluated using the Servo Hydraulic Equipment. The experimental results revealed that acidizing could improve the permeability of the damaged core sample but would affect the compressive strength of the core sample, especially when using 9% HF–12% HCl. The volume of mud acid required to achieve ARC 1.0 reduces when injection pressure increases, which should be greater than 30 psi (206 KN/m2) in order to achieve ARC greater than 1.0. It was also noted that higher injection pressure would reduce the overall effectiveness of the acid treatment due to insufficient reaction time. Key words: Berea sandstone core sample; compressive strength; matrix acidizing; permeabilityDownloads
Published
2012-03-21
Issue
Section
Science and Engineering
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How to Cite
The Effect Of Matrix Acidizing On The Compressive Strength Of Sandstone Formation. (2012). Jurnal Teknologi, 56(1), 175–191. https://doi.org/10.11113/jt.v56.909