Analysis on the Combined Perforating and Blasting Continuous Cropping Technique of a Oil Layer

With the deepening of oil field development, the reservoir of new wells is getting thinner and thinner, the output of single wells put into production by conventional perforation is getting lower and lower, the proportion of wells put into production by fracturing is increasing year by year, and the investment is increasing year by year.in order to reduce the proportion of inefficient wells and productive wells, perforation + high energy gas fracturing technology is used. The rocket propellant or special gunpowder is put into the target layer, ignited by the ground and burned in the wellbore to produce a certain amount of high temperature and high pressure gas. Through perforating the target layer, the high pressure pulse wave is generated to do work to the drill way twice. Formation of more uniform complex cracks, expand the spread range, the generated high temperature can dissolve the wax, gum and asphaltene caused by the hole blockage, reduce the generation of pollution. Under the continuous work of multiple pulse waves, the cracks spread rapidly, increase the chances of the wellbore communicating with natural fracture, the effect of near-wellbore stress is effectively overcome, the compaction zone around the hole is improved, and the reservoir reconstruction effect is improved, in addition to the completion of perforation, the fracturing of gas near the well zone is strengthened to improve the completion effect and achieve the purpose of increasing production and injection, and he field test of the combined perforation and blasting technology is carried out.