Potassium brines or potassium mud are the most widely accepted completion fluids / mud system for shale sensitive formations, especially the hard & brittle shales. K + ions will attach to clay surfaces & improve stability to shales which is exposed to the completion or drilling fluid. During drilling, the ions also help hold the cuttings together & minimizing dispersion into finer particles. Na+ions (from NaCI sodium chloride) unfortunately counteracts the benefit of K+ions.
That’s why it should be minimized by using fresh water instead of sea water for make-up water.

Tanya – frankj

Pak Ardian,

Mohon penjelasan 2 pertanyaan sbb:

1.Apakah pernah ada penelitian tentang pengganti potassium cloride (kcl) sebagai salah satu komponen Completion Fluid dengan natrium cloride(nacl) ? sehingga petani garam di Eretan, Madura, Bima atau tempat lain bias makmur.

2. Tentang parafin removal yang memang adalah toluen (kalo ‘gak salah – mohon dikoreksi) yang selalu dipakai pada sumur produksi – kalau penggantinya bensin menurut saya koq malah lebih baik daripada impor toluene yang harganya sekian kali lipat, karena setelah kami adakan dissolution test dan penetration test menunjukan angka yang tidak terlalu signifikan.

Tanggapan 1 – ardiann@unocal.com

Dear Sir. Apa kabar?

1. Sepertinya sdh umum, terkadang KCl disaturated dgn NaCl. Salah satu fungsi NaCl adalah sebagai ‘bridging particles’. Ada kiat2 bagaimana memilih fluid yg baik agar cocok dgn formasi (ini saya attchkan, Mas Budhi monggo di upload ke Milist, sumber: SPE).

2). Fantastic Sir! Removal paravin atau wax memang salah satunya Toluene base. Benzene base juga bisa sih, tapi ingat ingat perlu diperhatikan risk-nya (selain economic-nya). Karakteristik flash point, vaporisasi, paparan, de el el misalnya. Beberapa chemical yg diracik bersama heating bisa meremove paraffin.

OK sekian.

Lihat Attachmnet : SELECTION FLUID

Tanggapan 2 – berindil

Pak Frank,sedikit input tambahan

Tradisionally toluene memang dpt berfungsi sbg praff. solvent, ttp akan lebih jika menggunakan solvent dan dispersant. Solvent yg lebih murah dan lebih bgs dr toluene biasanya digunakan naphta(salah tiga bhn baku bensin/paraxylene). Kilang kita spt Cilacap memproduksi naphta.Jadi biasanya kombinasi dr naphta sbg pemecah, sedikit xylene sbg pelarut, dan sedikit plus dispersant agar partikel2 kecil2 tdk nempel di dinding2 pipa. Dispersant hrs dicari sendiri yg cocok (hrs oil soluble dan nonionik) krn umumnya merupakan inti dr ramuan specialty chemical ini.Semua bahan dpt dibeli dlm negri dan relatif murah dibanding dgn Toluene. Silahkan mencoba, sebarkan ke kawan2 lain jika berhasil.

Tanggapan 3 – frankj

Pak Ardian,

Mohon penjelasan 2 pertanyaan sbb:
1.Apakah pernah ada penelitian tentang pengganti potassium cloride (kcl) sebagai salah satu komponen Completion Fluid dengan natrium cloride(nacl) ? sehingga petani garam di Eretan, Madura, Bima atau tempat lain bisa makmur.

Tanggapan 3 – samperuru

Dear Pak Frank,

I wish we can do that, do something for our own small people. Potassium brines or potassium mud are the most widely accepted completion fluids / mud system for shale sensitive formations, especially the hard & brittle shales. K+ ions will attach to clay surfaces & improve stability to shales which is exposed to the completion or drilling fluid. During drilling, the ions also help hold the cuttings together & minimizing dispersion into finer particles. Na+ ions (from NaCl sodium chloride) unfortunately counteracts the benefits of K+ ions. That’s why it should be minimized by using fresh water instead of sea water for make-up water.

Cost wise, KCl & NaCl generally are the same. For offshore operations, if other issues permit, sea water is the most economical solution. The NaCl doesn’t come from any salt farming when it’s available around you for free. Most of the operators are selecting brines based on the availability & logistically makes sense.

,b>Tanggapan 4 – Frankj

Hi Pak Doddy

Firstly, I should have thank you for your great response, but my concern is if we can put NaCl to take the place of KCl because, I do think ( to my short knowledge ) we haven’t got a plant here in this country to produce such product to make potassium brine – do we ?

Secondly,by learning at your scientifical argument and know where you are standing now technically I have no doubt about – that is superb answer, reminds me to my old days in that expertise, but again logistically in term of cost by keep using KCL is my concern.