Retarder digunakan untuk memperlambat.docx - Retarder...

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Retarder digunakan untuk memperlambat pengerasan semen sehingga memperpanjang waktu pemompaan bubur. Retader digunakan pada sumur dengan kedalaman 6.000 – 25.000 ft dan temperatur pada dasar sumur antara 170 °F sampai 500 °F. Contoh retarder adalah :calcium lignosulfonate dan carbonxymethyl hydroxythyl cellulose (CMHEC). Retarder Retarderadalah zat aditif yang digunakan untuk memperlambat waktu pengerasan semen, sehingga waktu pemompaan dapat diperpanjang. Retarder terutama digunakan pada sumur-sumur dengan kedalaman antara 6000 -25000 ft dimana temperatur statik didasar sumur dapat mencapai 170 -500°F. Retarder ditambahkan pada bubur semen murni untuk mencegah semen mengeras dengan cepat, dalam hal ini retarder yang digunakan haruslah dipilih agar benar-benar cocok dengan material penyusun semen itu sendiri. Umumnya yang digunakan sebagai retarderadalah : Lignin(0,1 -1,0 %), Calcium Lignosulfonate(0,1 -2,5 %), Carboxymethyl Hydroxyethyl Cellulose(0,1 -1,5 %), Saturated salt (14 -16 lb per sack semen), Borax (0,1 -0,5 %).
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