ABDULLAH ÖZKAN, Behlül Merve KAPLAN, VİLDAN ÖZKAN, Sıtkı Ekrem TURAN

Effect of Micro-Sized Colemanite on the Rheological Properties of the Water Based Drilling Fluid

Drilling mud have been the subject of constant study since they are the most costly item of oil exploration. Recently, the several additives have been added to improve the rheological properties of the drilling mud. In this study, a water based drilling mud that is (1, 2, 3, 4 and 5) (% w/v) of colemanite (Ca2B6O11.5H2O), which is a calcium borate group mineral in the particle size of 100 μm subscale, was prepared for this drilling mud. The rheological properties such as plastic viscosity (PV), apparent viscosity (AV), gel strength, water loss and cake thickness of the obtained drilling muds were analyzed in detail using Fann Viscometer and American Petroleum Institute (API) testing equipment. As a result of the study, it was found that the added colemanite had a positive effect on the rheological properties of the drilling mud. When the analysis results of the drilling muds obtained at different ratios of colemanite addition are compared with each other, it is found that 4% of colemanite-added drilling mud has the best properties (excluding gel strength). The water-based drilling mud prepared by adding colemanite has 30.4% cP of plastic viscosity; 63.6% cP of apparent viscosity; 140% of rupture point; gel strength (10-sec and 10-min) values compared to the water based drilling muds prepared without any addition was positively affected.

Mikro Boyutlu Kolemanitin Su Bazlı Sondaj Çamurunun Reolojik Özelliklerine Etkisi

Sondaj çamuru petrol aramalarının en büyük maliyet kalemini oluşturduğu için sürekli olarak üzerinde çalışılan konu olmuştur. Son zamanlarda, çeşitli katkı maddeleri eklenerek sondaj çamurunun reolojik özellikleri iyileştirilmeye yönelik çalışmalar devam etmektedir. Bu çalışmada, petrol aramalarında en çok kullanılan su bazlı sondaj çamuru hazırlanmış ve hazırlanan sondaj çamuruna 100 µm elek altı tane boyutunda kalsiyum borat grubu minerali olan kolemanit (Ca2B6O11.5H2O) farklı konsantrasyonlarda (1, 2, 3, 4 ve 5) (%w/v) eklenmiştir. Elde edilen sondaj çamurlarının plastik viskozite (PV), görünür viskozite (AV), jel mukavemeti, su kaybı ve kek kalınlığı gibi reolojik özellikleri Fann Viskometre ve Amerikan Petrol Enstitüsü (API) sıvı kaybı test aletleri kullanılarak detaylı bir şekilde analiz edilmiştir. Çalışma sonucunda, eklenen kolemanitin sondaj çamurunun reolojik özelliklerine olumlu yönde etki ettiği görülmüştür. Farklı oranlarda kolemanit eklenmesi sonucu elde edilen sondaj çamurların analiz sonuçları birbiriyle mukayese edildiğinde ise; %4 oranında kolemanit eklenmiş sondaj çamurunun en iyi özelliklere (jel mukavemeti hariç) sahip olduğu görülmüştür. Kolemanit eklenerek hazırlanan su bazlı sondaj çamurunun, herhangi bir ekleme yapılmaksızın hazırlanan su bazlı sondaj çamuruna kıyasla, plastik viskozitesinin %30,4 cP; görünür vizkozitesinin %63,6 cP; kopma noktasının %140 arttığı; jel mukavemeti (10-saniye ve 10-dakika) değerlerinin de olumlu yönde etkilendiği tespit edilmiştir.

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