Assessments on cost of fluids of different densities are also made on the basis of microsphere selection and concentration for the workover program in the White Tiger Oil Field. The paper proposes options to bring fluid costs to more economical levels based on microsphere regeneration. Detailed analysis has been made on all operating JV “Vietsovpetro” wells calculating the required amount of microspheres for workover in accordance with the selected grades. The data reported in this paper can be used for mud design and to provide technical support for well workovers whenever low density fluids (less than 1 g/cm3) are considered. In addition to mud properties and formulating practices, the paper also provides useful tips in the preparation, handling, and waste management of low density fluids for workover programs.

Speaker information
Alexander graduated Mendeleyev University of Chemical Technology of Russia in 1976 as chemical engineer-technologist and then took post-graduate studies.
Throughout all career Alexander was working as mud engineer and technical expert on preparation, testing and conditioning of drill mud and cement slurry at different production facilities and institutions affiliated to former Ministry of oil and Ministry of gas, also in JSC "Zarubezhneft" (JV "Vietsovpetro") for recent years.
Alexander is the author of several inventions and innovations on improvement of drill mud technology and articles on the same subject that have been published in Russian and foreign magazines.
For the last four years Alexander has studied and introduced into practice light weight additives based on hollow glass bubbles to drill mud for solving of complicated tasks of drilling and workover of wells.
SPE member.
3M Russia Oil&Gas consultant.