Using the shock wave + resonance + continuous negative pressure pulse of the water hammer effect plugging removal technology, the oil layer blockage in the near wellbore area of the water injection well can be relieved, the injection effect can be achieved, and the normal injection of the water injection well can be ensured.The operation process is simple, the pipe string is not moved, and the blockage can be directly discharged during the process. The ground only needs to provide 8~12 atmospheric pressure and 24 volts direct current. The construction time is about 3~6 hours, no chemical agent, environmental protection.
General water injection, surface separate injection, underground separate injection and other water injection well plugging removal; Plugging removal of polymer injection well; The maximum wellhead pressure is 34 MPa, and the reservoir permeability is > 0.25mD, construction pressure is 5 ~ 22 MPa.
1.Different from ultrasonic wave and electric pulse technology, the technology of stimulating water hammer effect can obtain larger energy shock wave and achieve the effect of plugging and dredging;
2.Periodic batch water hammer effect superposition technology can avoid violent destruction of the original structure of the formation, resulting in collapse plugging or destruction of the cement sheath, and can avoid the impact strength is too weak to reduce the plugging effect;
3.The impact of the periodic batch water hammer effect has a good shock, crushing, shearing, scouring, stripping and cleaning effect on the blockages such as scaling, particles and pollution attachments in the formation pores, and changes the interface state;
4.The positive and negative water hammer effect causes the reciprocating motion of the liquid flow, which has a good effect on carrying and removing the falling particles and suspended solids, avoiding deposition and blocking, improving the channel environment and prolonging the deblocking period;
5.The continuous periodic water hammer effect makes the shedding particles and suspended solids directly discharged from the wellhead, and the shock wave shape ( frequency, intensity ) can be artificially adjusted;
6.The reciprocating transformation of positive and negative water hammer has a good effect on the throat of narrow hole and improves the connectivity;
7.The blockage removal radius is large, reaching 3~20 meters, which effectively solves the problem of low production and low injection volume caused by blockage of oil and water wells.
Up to the end of 2024, 450 wells have been successfully increased injection technology services in Daqing, North China, Karamay, Jiangsu, Tuha, Jilin, CNOOC, Qinghai and Liaohe Oilfields. Years of follow-up monitoring results show that the method is simple but efficient, and the effect lasts for a long time. Many wells are more than 12 months. The patented technology can solve the problem of formation plugging in oil and water wells in oilfield development and production, and the effect of increasing injection is good.
