Study and Application of Fuzzy Ball Micro Bubble Temporary Plugging Technology

摘要

Using cement to plug channeling as the conventional method is easy to pollute formation when the cement quality of oil well is bad or there is channeling between oil layer and water layer. In order to solve the problem of formation pollution fuzzy ball micro bubble temporary plugging technology is studied. Fuzzy ball micro bubble can't reverse rock wettability and can't stop fluids of reservoir flowing. The properties of rheology, static plugging and dynamic pollution were evaluated. The laboratory experiment proved that the fuzzy ball micro bubble has good inject ability and its viscosity decrease with shear rate. Under the temperature of 120 °C, back pressure of 0.5MPa and differential pressure of 5MPa, the leakage of fuzzy ball micro bubble was 0.Core permeability recovered ratio was up to 96.1% after pollution for 48 hours. The technology has been used on four wells in Jidong oilfield. The results of pilot test showed that the effect of decreasing produced water and increasing oil production was very obvious. The cumulative quantity of oil was 12435 t; the cumulative decreased quantity of water was 32496 cubic meters and the average water cut had decreased by 17.6%. The experimental evaluation and application effect indicates that the technology not only can reduce the operating risk but also has good plug channeling and layer protecting effect. After it is used on spot, the effect of increasing oil production and reducing aquifer yield is obvious and the period of validity is much longer.