Ada yang tahu bagaimana menghandle cutting dari sumur pengeboran dengan menggunakan lumpur minyak (OBM) ? Tentunya dengan cara yang aman dan ekonomi.

Tanya – Gustioro@exspan

Dear all,

Ada yang tahu bagaimana menghandle cutting dari sumur pengeboran dengan menggunakan lumpur minyak (OBM) ?

Tentunya dengan cara yang aman dan ekonomis.

Tanggapan 1 – Doddy Samperuru

Dear Pak Gustioro,

Here in offshore East Malaysia, one deepwater operator have been using a special equipment called Thermal Disorption. Basically it’s a big horizontal centrifuge-alike equipment installed on the rig that can separate solid cuttings from the liquid. After considered free of oil, then the solid cuttings will be dumped into the sea.

The problem: this equipment is very expensive.

Another common method: ship it onshore for disposal. The problem: it’s highly dependant on the weather & not all drilling site is close enough to the onshore disposal facility.

Future method: reinjection into depleted reservoirs. This method has been practiced in North Sea & GOM.

Tanggapan 2 – Oran Jacob

Pak,

Kapan kita memakai OBM, kapan WBM ? Apa yang dimaksud dengan sintetic mud ?

Tanggapan 3 – Doddy Samperuru

Dear Pak OJ,

Most of wells can be drilled by using WBM (Water Based Mud). WBM is the most economical type of drilling fluid, easy to build, inexpensive to maintain, safer & available almost everywhere around the globe. OBM (Oil Based Mud) has advantage over WBM, which is better lubrication of the drill strings, compatibility with clay or salt formations & a much higher rate of penetration. That’s why OBM usually is more preferred mud for some difficult & critical wells, HTHP zones, water sensitive formations, etc. However, OBM is more expensive than WBM. Another problem is related to environment; we simply cannot dump oil to the ground or water. Synthetic based mud is a water-internal emulsion mud which the external phase is a synthetic fluid, rather than oil. It basically maintains the good properties of OBM but environmentally friendly. That’s why, more & more synthetic mud has been used compared to OBM, especially for offshore operations. There’s a problem thought, it’s more expensive than OBM.

Tanggapan 4 – Fitrah Arachman

Rekan milis migas,

Saya tertarik dengan masalah cutting waste ini. Jika kita menggunakan OBM atau synthetic mud, cutting yang dihasilkan tentu akan mengandung mud tersebut plus additif-additif yang ditambahkan. Mengingat industri migas di indonesia sudah cukup lama, bagaimanakah cutting-cutting ini diperlakukan ? terutama yang menggunakan OBM dan synthetic mud…pasti jumlah cutting waste ini sangatlah besar. Apakah dari rekan milis ada yang mengetahui masalah penanganan ini ?

Bagaimanakah peraturan dari permerintah sendiri mengenai cutting waste ini, berapa persen kandungan minyak dan aditif sehingga cutting tersebut dianggap ‘ramah lingkungan’ ?