APHRON-BASED DRILLING FLUIDS: SOLUTION FOR LOW PRESSURE RESERVOIRS
Journal Title: UNKNOWN - Year 2009, Vol 21, Issue 1
Abstract
Drilling wells throughout depleted or low pressure reservoirs requires low density drilling fluids, often with density less than water. Methods to reduce the density of drilling fluids have included mixing-in air or nitrogen. However, problems with these approaches include instability of gas bubbles (bubbles collapse or expand) and increased costs. Recently, the use of micro bubbles named aphrons in drilling, completion and workover fluids has proven success in solving many problems related to low pressure reservoirs such as fluid loss control, formation damage, stabilization of multipressure sequences with one fluid and possible differential sticking. Aphrons represent bubble with uniquely structure stabilized with surfactant. Against conventional micro bubbles, aphrons are more stable in downhole conditions and they are generated using standard mixing equipment. Owing to their properties and overpressure in wellbore aphrons penetrate into low pressure layers and set up inner bridging. Depleted wells which are very expensive to drill underbalanced or with other remediation techniques can now be drilled overbalanced. This paper presents description of aphron structure and stability, aphron bridging mechanism, aphron-based fluid composition and properties, and field experiences in applying aphron-based fluids.
Authors and Affiliations
Nediljka Gaurina-Međimurec Borivoje Pašić
Keywords
Related Articles
- EP ID EP30001
- DOI -
- Views 157
- Downloads 1
A NEW FREEWARE PROGRAM FOR THE PROBABILITY OF SUCCESS CALCULATION OF NEW GAS DISCOVERIES WITHIN THE CROATIAN PART OF THE PO DEPRESSION
The aim of this paper is to introduce an application in the form of a transparent freeware program which can be used for the assessment of the Probability of Success (abbr. POS, also POS and geological probability are sy...
BAKOVIĆI THE BIGEST GOLD DEPOSIT OF BOSNIA AND HERZEGOVINA
Tectonic setting, para genesis, structure and texture of ores, sulphide sulphur isotopic composition allign the Bakovići veiny deposit in the group of polymetallic, postmagmatic hydrothermal deposits in the Mid-Bosnian S...
INŽENJERSKOGEOLOŠKE ZNAČAJKE TUNELA "KONJSKO"
Istraživačkim radovima za potrebe projektiranja tunela «Konjsko» s dvije tunelske cijevi na autocesti Split-Zagreb, dobiveni su svi relevantni podaci o značajkama stijena i terena temeljem kojih su izrađeni prognozni inž...
PARAMETRI STIŠLJIVOSTI SLABOPROPUSNIH NASLAGA KOJE OMEĐUJU VODONOSNI SLOJ
U radu je prikazana važnost pravilne interpretacije edometar-ske krivulje, a u cilju određivanja što točnije vrijednosti mjerodavnih parametara stišljivosti slabopropusnih naslaga koje omeđuju vodonosni sloj. Postupak in...
THEORETICAL DEVELOPMENT OF THE ESTIMATE OF DIAMOND WIRE SAVING PLANT
The article deals with possible estimates which would make the choice of the diamond wire sawing plant easier. Based on the principle law of friction of thin elastic bodies. the estimate procedure intended for the choice...