Abstract
In the cementing operation, it is necessary that the entire circumference of the annular is filled by the cement slurry and that it develops adhesion to the casing and formation. For this, an efficient removal of the drilling fluid is necessary, which requires that its chemical composition is compatible with that of the cement slurry. The objective of this work is to formulate a drilling fluid in a micro emulsified system and test its compatibility with the cement slurry to assess the effects that an unwanted contamination can have on the properties of the slurry. In the compatibility test, the rheological properties and the compressive strength of cement slurry contaminated with drilling fluid in different volumetric proportions were evaluated. The compressive strength of the cement slurry was determined, and the loads that the paste supports were checked. The compatibility test showed no visual changes in the properties of the slurry, although, after the addition of the drilling fluid, there was a decrease in the compressive strength.
Highlights
Well drilling has been conducted since ancient times for the purpose of finding water
For the fluid formulation, a point in the microemulsion region (Winsor IV) was chosen, composed, in mass fraction, of 40% surfactant (S), 55% aqueous phase (AP) and 5% oily phase (OP). This point was selected in order to decrease the cost of drilling fluid by reducing the amount of surfactant and increasing the proportion of the aqueous phase
Compatibility between fluids was verified in all proportions
Summary
Well drilling has been conducted since ancient times for the purpose of finding water. The intensive search for oil began in the 19th century with industrialization and, increased world demand for oil products. The wells were drilled by percussion methods at low depth using water or suspensions formed with local clays as drilling fluids. Wells have been opened by rotating equipment at extremely high depths and using increasingly complex fluids (BALTAR e LUZ, 2003). Http://www.granthaalayah.com ©International Journal of Research - GRANTHAALAYAH [1]. Drilling fluids are complex mixtures of solids, liquids, chemicals and, sometimes, even gases
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