Sieve tube free composite fracturing fibre sand prevention process

The invention provides a novel oil well sand prevention technology and an implementation method. The technology is characterized in that: on the one hand, no sieve tubes is arranged in the oil well; on the other hand, no chemical cementing agent is injected into the oil layer; instead, the oil layer is filled by a method of injecting two kinds of pad fluids and filling a mixture of glass fiber and sands mixed by sand carrying fluid, which can prevent sands with a size of more than 0.07mm. The first pad fluid injected in advance is an oil layer pretreatment agent and is prepared by micro latex, hydrochloride and water; then the injected second pad fluid is sand carrying fluid used for the oil well fracturing, the viscosity of which is strictly controlled, and the injected second pad fluid plays a role of joint forming; next, the filling agent mixed by fiber and sands through the sand carrying fluid used for the oil well fracturing is injected into the oil layer. The technology has no damage on oil layer permea