Volume fracturing and energy replenishing method for low-yield horizontal well in dense oil reservoir
A technology for volume fracturing and energy supplementation, which is applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., and can solve the problems of difficulty in establishing a displacement system, low production and low efficiency of oil reservoirs, and low maintenance level of formation pressure, etc. Achieve the effect of improving development effect and improving single well production
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Embodiment 1
[0029] The present invention provides a method for supplementing energy by volume fracturing of low-yield horizontal wells in tight oil reservoirs. It has broad application prospects.
[0030] The present invention is a production stimulation method for low-yield horizontal wells in tight oil reservoirs. The invention provides a method for supplementing energy by volume fracturing of low-yield horizontal wells in tight oil reservoirs, through repeated reformation of fractures in the middle of the horizontal section far away from the water line , to avoid the risk of water breakthrough while increasing the production of a single well. Moreover, volume fracturing and energy supplementation are integrated in the repeated stimulation process. First, through staged volume fracturing, the volume of reservoir stimulation is further increased, the distance of fluid seepage is shortened, and the remaining oil between fractures and wells is produced; Fracturing quickly injects a large ...
Embodiment 2
[0045] The present invention is a production stimulation method for low-yield horizontal wells in tight oil reservoirs. The invention provides a method for supplementing energy by volume fracturing of low-yield horizontal wells in tight oil reservoirs, through repeated reformation of fractures in the middle of the horizontal section far away from the water line , to avoid the risk of water breakthrough while increasing the production of a single well. Moreover, volume fracturing and energy supplementation are integrated in the repeated stimulation process. First, through staged volume fracturing, the volume of reservoir stimulation is further increased, the distance of fluid seepage is shortened, and the remaining oil between fractures and wells is produced; Fracturing quickly injects a large amount of liquid into the formation at fixed points, realizes the effective replenishment of deep energy in the reservoir, and increases the formation pressure level.
[0046] A method fo...
Embodiment 3
[0062] Based on Embodiment 1, in this embodiment, the staged fracturing string described in step S1 adopts a compression double-sealed single-clamp combined tubing string.
[0063] The minimum displacement described in step S2 is 0.5~1.0m 3 / min, the squeeze pressure does not exceed the pump stop pressure for the initial fracturing.
[0064] The low-friction oil-displacement fracturing fluid described in step S3 is low-viscosity oil-displacement slick water with a viscosity of 6~8mpa•s; the maximum displacement is 5.0-6.0m 3 / min.
[0065] The secondary temporary plugging described in step S4 is based on the larger volume of reservoir stimulation obtained in step S3, in order to further increase the contact area between the fracture and the reservoir, first add a large-scale temporary plugging agent to accumulate near the wellbore fracture , to seal the original cracks, transfer the cracks to uncracked holes to open new clusters; then add soluble fiber guar gum base fluid wi...
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Abstract
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