Mechanism and Application Effect of Compound Perforation Fracturing Technology in Low Permeability Reservoir

Abstract

Compound perforation fracturing technology is a space combination type ultra-deep perforating that can overcome some flaws conventional perforation has, such as shallow penetration and compaction damage. It can remove the compaction band and near wellbore pollution in rock matrix which results from conventional perforation. This paper introduces the theory of effect and influence factor of compound perforation fracturing technology and summarize the advantages for low permeability gas well on the basis of analyzing the mechanism of action about increase production of compound perforation. In order to evaluate the effects of application of this technology in in low permeability reservoir, 11 compound perforation wells and 12 conventional perforation wells were selected which have the similar physical property and the evaluation was conducted in two blocks. The results show that compound perforation can make the formation fracture pressure decrease in 3~5MPa and increase the permeability near the perforation channel. This technology has better effects than the conventional and decrease the cost effectively, improving production in low permeability oil and gas field.

Experimental Evaluation of the Integrated Composite Perforation System under Simulated Tight Reservoir Conditions

“…By exploiting the mechanism of velocity difference between explosive and propellant combustion, secondary energy release is achieved by transporting the fragmented propellant into the perforation tunnels by the vortex field gravity generated by the high-velocity jet stream during energy accumulation perforation, which generates a large amount of gas to clean the compacted zone and expand to form fractures [3][4] . This technology was proposed in the 1980s, and by the mid-1990s, it began to be applied in various oilfields [5][6][7][8][9][10] . For the evaluation of conventional perforation efficiency, various manufacturers often use the method recommended by API RP 19B to test the fluidity of the target before and after perforation [11] , and then cut the target to physically measure the morphology of the perforation tunnel and analyse the damage of the perforation tunnel using scanning electron microscopy [12] to evaluate perforation efficiency.…”