METHOD FOR FILLING OIL-GAS WELL OF FRACTURED OIL-GAS RESERVOIR WITH ISOLATION PARTICLES TO REDUCE WATER AND INCREASE OIL PRODUCTION

A method for filling an oil and gas well of a fractured oil and gas reservoir with pack-off particles to reduce water and increase oil production comprises the following steps: (1) injecting a filling liquid carrying pack-off particles into a wellbore and a fracture via a wellhead, until a stratum crack/fracture extension pressure is reached or exceeded, or until an injection amount per unit injection pressure is close to zero, or until a preset filling amount of pack-off particles is reached; (2) launching production. The present invention efficiently addresses the problem of water channeling and water production existing in various fractures, by direct filling and recovery filling of the fractures, directly filling of the annular space, and filling from the water injection well to the production well. In particular, by utilizing two-pressure staged pressurizing filling and recovery filling, the pack-off particles smoothly enter unopened fractures, so that the blocking effect of the fractures is effectively improved, the flow conductivity of various fractures is reduced, and the water production of the well is reduced; meanwhile, the pressure gradient during the production of the matrix is further improved, the producibility of the matrix oil and gas is improved, and accordingly, the recovery ratio is improved.