DOI: 10.24412/2076-6785-2021-4-40-43
Abstract
The use of a traditional well-killing fluid (water-salt mixture) may lead to a large liquid loss, which causes the increase in the amount of chemicals needed for operation, time expenditures and consequently the overall price of work.
In this study a series of formation damage tests were performed on core samples from Cenomanian formation at reservoir conditions in order to collect data about the effectiveness of several modern block agents presented on the market. The parameter of the fluid intake capacity, which defines the invasion zone characteristics of the near-wellbore formation, was examined for the purpose of a more consistent and complete analysis of the research data.
As a result: two block agents (Gelenix and MEX BLOCK) had low value of the fluid intake during the expose period (80 hours) and high value of the formation damage coefficient. That makes these two-block agent the most effective among the tested process fluids.
Materials and methods
Materials: rock (core samples) from Cenomanian formation, wellkilling brines, block agents (based on gelling fluids), oil samples from Cenomanian formation. Methods: the measurement of swelling capacity of oil-saturated / watersaturated samples, formation damage tests on block agents.
Keywords
block agents, core samples, permeability, formation damage coefficient, fluid intake capacity, oil saturation
