Horizontal well oil and gas water blocking device

Abstract

The invention discloses a water blocking device for passing oil and gas in a horizontal well. It mainly includes: a device main body (29), an inlet (1), a main flow channel (2), a first circular truncated flow channel (4), a buffer flow channel (6A), a second circular truncated flow channel (7), and a third circular truncated flow channel (7). channel (8), fourth circular truncated channel (9), fifth circular truncated channel (10), cut-in channel (11), outer cavity swirl channel (12), inner cavity swirl channel (14), first A branch flow channel (19), a second branch flow channel (21), a third branch flow channel (23), and an outlet (15). The device is designed according to Bernoulli principle and Y-shaped flow channel splitting and phase separation principle. It can be used for water blocking in low-viscosity and ultra-low viscosity crude oil wells, as well as in gas wells; the device is also suitable for installation in new wells for formation Equilibrium inflow profile before water breaks through the wellbore, and it is installed in old wells to greatly increase the additional resistance of water after formation water breakthrough, so as to reduce water cut and improve oil and gas recovery.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development in the petroleum industry. Specifically, it relates to a horizontal well oil and gas water blocking device, which can be used for water control in horizontal gas wells, water blocking in oil wells, prolonging the life of oil and gas wells, and improving oil and gas recovery. Background technique [0002] Thanks to the improvement of directional drilling technology and the advantage of large drainage area, horizontal well completions are widely used in my country's onshore oilfields and offshore oilfields. However, due to the heterogeneity of permeability between layers, layers, and completion sections, different water avoidance heights, and the shape of water ridges, water ridges are prone to occur in edge-bottom water reservoirs when horizontal wells are used for development. When the formation water in a certain section breaks through the wellbore, the water content of oil...

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Problems solved by technology

[0003] At present, the application reports of automatic inflow control devices are only applicable to oil wells with a viscosity greater than 10mpa.s. When the viscosity of crude oil is less than 10mpa.s, it is no longer applicable. However, the viscosity of crude oil in some offshore oilfields in my country is even as low as 0.3mpa.s. The breakthrough of the technical bottleneck is imminent; at the same time, when the water-gas ratio is relatively low in the process of gas well exploitation in my country, foam drainage technology can be used to discharge the accumulated water in the wellbore to the wellhead, but when the water-gas ratio is too high, the foam drainage technology is due to the cost. Substantial increase, no longer applicable

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