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Ordinary foam drilling fluid three-phase circulating micro- foam drilling fluid system in recent years, domestic and foreign drilling fluid sector has introduced a new type of low-density drilling fluid system , it overcomes the large gas pump Sheung Shui bad, can not be repeated , resulting in additional equipment on the craft , the use of the treatment agent waste due to discharge of serious environmental pollution problems . Microbubbles has the above advantages , while domestic research because with field devices unsuitable and did not get the promotion of good research on this article from the basis to meet the the scene conditions of low shear rate . First , in the low shear rate conditions , the indoor complex foaming ability , small foam , foam and long life , and the salt, the anti- calcium , good resistance to oil pollution blowing agent FPJ-1 and foam stabilizing effect XC, a foam stabilizer based on micro - foam drilling fluid formulations developed to meet the requirements . This article indoor physical mixing method to generate microbubbles . Shear rate system , the higher the shear rate , the more stable the system , the better the performance . But when the shear rate increases to a certain value (1600rpm) system performance is basically stable. Micro- foam drilling fluid system in the low shear has a fine foam , low density , good liquidity , and stable for a long time , and salt, calcium resistant , anti- oil pollution and temperature resistance with good . Micro- foam drilling fluid system in the alkaline environment of pH range 8 to 10 hours and the best stability . The elevated temperature will reduce the stability of the system . After indoor API fluid loss analyzer experiment and API plugging materials experiments to study the mechanism of micro- foam drilling fluid plugging , confirmed the good performance of plugging the system in the simulation of the low-pressure strata . Microbubbles drilling fluid system and foam system significant difference is that the significant differences in the characteristics of the microstructure : microbubbles in uniform , non-clustered , non-contiguous states exist , in order to ensure continuous loop system can use . Drawn through the experimental study can be recycled micro - foam drilling fluid has a low shear rate conditions , high stability , density adjustable ( 0.3 ~ 0.9g/cm 3 ) , a small amount of fluid loss , salt , anti- calcium , anti- temperature performance , plugging effect .
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