Reservoir Sensitivity and Its Preventing Measures for Waterflooding in Baozhong Block of Baolang Oilfield

Baolang Oilield belongs to a clastic rock reservoir with low porosity, low permeability and low porosity, ultra-low permeability, where the overall physical property of the reservoir is poor and some of the wells had the phenomenon that more water injection was conducted, more difficulty was created in the process of waterflooding. In consideration of the problem, water sensitivity of the reservoir rock is evaluated in laboratory experiments, the causes of poor water absorting in the injectors of the block are systematically analyzed, for the purpose of solving the problem, pretreatment techniques are developed for improving the water absorpting ability in strong water sensitivity reservoirs, by which the damage of injected water to the reservoirs can be reduced, the absorption ability to the injectors can be raised for ensuring the stable water injection in the oilfield.