BLACK-LIG200 (organic lignite) of Millennium Energy, as a synthetic-based filtration loss agent, was applied in the constant rheology synthetic oil-based drilling fluid system, which was successfully applied in 16 wells in blocks WZ6-9 and WZ12-1 of Beibu Gulf Oilfield in the western part of South China Sea, and its performance was stable.
Background:
Layer leakage is serious, emulsion instability under low-temperature-high-temperature temperature difference and low-temperature rheology regulation and other technical difficulties, seriously restricting China's South China Sea oil and gas resources drilling and development process.
In order to solve the above technical problems, Millennium Energy have developed synthetic-based drilling fluids with "constant rheology" performance, which can keep the dynamic shear force, static shear force, and low shear rate viscosity constant within a certain temperature range (20~180 ℃). It can ensure reasonable control of ECD under low temperature and maintain good suspension of drill cuttings under high temperature, which can meet the technical requirements in deepwater drilling process.
The rheology of drilling fluids is greatly affected by temperature, especially difficult to control viscosity at dynamic shear and low shear rates, and the resulting well leakage.
Equivalent Circulating Density (ECD) is high and pressure control is difficult, and a series of problems are becoming challenges for deepwater drilling in the South China Sea.
The effect of BLACK-LIG200 (organic lignite) filtration loss agent of Millennium Energy on the change of μp and τd of drilling fluids with temperature is small, but the filtration loss reduction effect of BLACK-LIG200 (organic lignite) filtration loss agent of Millennium Energy on the drilling fluids is significantly better than that of the asphalt-based filtration loss agent.
Millennium Energy's BLACK-LIG200 (organic lignite) acts as a synthetic-based filtration loss agent, and is well-matched with emulsifiers, organoclays, and flow conditioners in constant rheology synthetic-based drilling fluid systems. In low-density drilling fluid systems, it can assist in purifying the borehole and improving solid phase suspension.
