Research and Application of Repetitive Shaped Energy Shock Wave Technology for Improving Permeability and Removing Blockages

During the development process of oil and gas fields, drilling, completion, and production operations can pollute and block the oil and gas channels of formation, reducing the production capacity of production wells; Low permeability reservoirs developed by water injection have the phenomenon of insufficient injection due to poor permeability. On the basis of traditional liquid electric effect and metal wire electric explosion unblocking technology, assisted by energetic materials, a repeated shaped energy shock wave technology is formed, which combines high-power electric pulse with discharge plasma to convert electrical and chemical energy into shock wave mechanical energy. Through repeated operation of the pulse power source, repeated shock waves are generated in the wellbore, the action times and peak pressure of which can be designed according to the reservoir permeability and plugging degree, chiving reservoir permeability enhancement and unblocking while ensuring wellbore integrity. This article introduces the generation mechanism, influencing factors, indoor and on-site tests of shaped charge shock waves. Through indoor experiments, it has been proven that shock waves have effectively unblocked the perforation hole with cement sealing without damage to the simulated casing and cement sheath. Through on-site experiments, the feasibility of increasing permeability and unblocking technology has been verified by comparing water injection volume and production well liquid rate before and after unblocking. The results show that the combination of electric explosion plasma and energetic materials can produce stronger controllable shock waves and improve the permeability increasing and plugging removal effect, which is of great significance in oil development.