The invention belongs to the technical field of oil-containing
solid waste treatment technologies and
oil production engineering, and particularly relates to a method for harmless treatment of
oil sludge sand. The method includes the following steps: (1) screening of the
oil sludge sand; (2) screening of an activator; (3) determination of
reaction conditions; (4) an
anaerobic reaction and methanegas collection; (5) screening of an abandoned oil reservoir; and (6) injection of the
oil sludge sand subjected to the
anaerobic reaction into the abandoned oil reservoir. Compared with conventional oil
sludge sand treatment, the method has the
advantage of recovering energy
methane gas, and meanwhile, the treated oil
sludge sand is injected into the reservoir, so that environmental
pollution caused by external discharging is avoided, and the treatment cost of the oil
sludge sand is greatly lowered; and meanwhile, the abandoned reservoir treated by the method has the advantages of long effective period,
high input-output ratio and good field test effect, the effective period is more than three years, the
recovery ratio is increased by 10% or above, the
methane gas yield reaches 5.0*10<7> m3 or above, and the input-output ratio reaches 1:12 or above.