Packer packing multi-layer hydropower abrasive perforating and fracturing integrated technique

Abstract

An integrative method for a packer to pack off a multi-layer hydraulic sand-spraying perforation and pressure fracture is used in the multi-layer perforation and the pressure fracture of a well of well completion of a petroleum casing. A pipe column comprises an oil pipe, a safety joint, a hydraulic ejector, a K34 or a Y34 packer, a uniflow valve, a sieve vessel and an end cap, wherein, the lower layer of a hydraulic ejector position requires perforation depth. With the completion of perforation, the hydraulic sand-spraying fractures the lower layer by actively circulating the lower layer of the hydraulic sand-spraying perforation. When the hydraulic sand-spraying pressure fracture for the lower layer is completed, a reverse circulation surge tank is processed and the pipe column is leveled up and dragged to the upper layer of perforation pressure fracture to continue to fracture the upper layer by hydraulic sand-spraying perforation. After completion, the pipe column is lifted to be put into the well-completion pipe column to discharge liquid and finish production. The perforation is not required by each layer because only an oil pipe needs to be dragged to finish the multiple fracturing of multiple layers of the well. The integrative method integrating the perforation, the fracture and the packing-off together is new stimulation treatment technology. In addition, the fracture is reliable, construction is easy and convenient and period is short.

Description

technical field [0001] The invention discloses a novel packer used in the petroleum industry to seal off multi-layer hydraulic sand blasting perforation and fracturing integrated process method, which is suitable for multi-layer perforation and fracturing reconstruction of oil and gas wells in casing completion mode. Background technique [0002] For oil and gas wells with multiple layers in one well, due to the large difference in physical properties and strong heterogeneity among the reservoirs, when hydraulic sand blasting technology is used for layered fracturing, after the fracturing of the lower layer is completed, the pipe string is lifted , when fracturing the upper layer, if the fracture pressure of the upper layer is higher than that of the lower layer, the fracturing fluid that entered the upper layer may "leak" into the lower layer. On the one hand, the upper layer cannot be fully fractured; "has been reformed, resulting in the failure of effective reformation of...

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Problems solved by technology

[0002] For oil and gas wells with multiple layers in one well, due to the large difference in physical properties and strong heterogeneity among the reservoirs, when hydraulic sand blasting technology is used for layered fracturing, after the fracturing of the lower layer is completed, the pipe string is lifted , when fracturing the upper layer, if the fracture pressure of the upper layer is higher than that of the lower layer, the fracturing fluid entering the upper layer may “leak” into the lower layer. On the one hand, the upper layer cannot be fully fractured; "has been reformed, resulting in the failure of effective reformation of the upper and lower layers, seriously affecting the production of oil and gas wells

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