Development and Performance Evaluation on High Temperature Emulsive Fracturing Fluid

A kind of emulsifying agent has been developed in the lab for preparation of W/O type emulsive fracturing. The influence of the added amount of emulsifier, oil-water ratio and stirring intensity has been discussed. The formulation of W/O emulsive fracturing fluid under different temperature (90℃, 120℃ and 130℃) are gained. In addition, engineering evaluation has been conducted on formulation of emulsive fracturing fluid, mainly evaluation on rheological characteristics, filtration property and formation damage. It has been proved that the rheological characteristics of this formulation can satisfy the requirement for fracturing fluid. The filtration of fracturing fluid is low. Comparing with water base fracturing fluid, the reduction percentage of formation damage is 20% with core samples from Dong-1 Member of Nanbao Oilfield. The apparent viscosity is 88 mPa·s, when the fluid has sheared for 120 minutes at the shear rate of 170 s^-1 on the temperature of 130℃. This kind of fracturing fluid can satisfy fracturing in the medium, high temperature and water-sensitive formation.