This paper demonstrates a new cationic surfactant SQ-8 which is used as a clay swelling inhibiting additive in water-base crosslinked fracturing fluid. It has a better performance than other additives available for clay swelling inhibiting. in addition., it also plays some role in viscosity increasing, corrosion inhibiting, bacteria-killing and emulsion breaking etc..
This additive is added into the fracturing fluid during its preparation. Its advantages are: low amount of addition, no requirement of special equipment and technique, good compatibility with both fracturing and formation fluids and no formation damage.
A large number of in-house simulation tests and field tests have proved that the new additive has very good properties. Currently, it has been widely used in field operation, and good results are obtained.