A self-expanding layered packer suitable for gravel packing in horizontal wells

Abstract

The invention discloses a self-expanding stratified packer suitable for gravel filling in a horizontal well. The self-expanding stratified packer includes an upper-portion adapter connector, an upper-portion packing assembly, a lower-portion packing assembly and a lower-portion fast connector which are sequentially connected from top to bottom. An inner base pipe is connected between the upper-portion adapter connector and the lower-portion fast connector, the inner base pipe is located in the upper-portion packing assembly and the lower-portion packing assembly, the inner base pipe and the annular space between the upper-portion packing assembly and the lower-portion packing assembly form a liquid flow circulation channel, the variable diameter area of the upper-portion adapter connectoris provided with an upper circulation hole communicated with the liquid flow circulation channel, and the lower-portion fast connector is provided with a lower circulation hole communicated with the liquid flow circulation channel. The self-expanding stratified packer solves the problems that gravel filling and sand control in horizontal wells can not achieve a water-sealing layer, a strong waterflooded layer, a mudstone layer and stratified production can not be achieved. The initial water content of the oil well can be reduced, the yield of the oil well is improved, and the self-expanding stratified packer can be widely used in gravel filling and sand control operation in horizontal wells.

Description

technical field [0001] The invention relates to a petroleum well completion tool, in particular to a self-expandable layered packer suitable for horizontal well gravel packing. Background technique [0002] In the sand control operation of gravel packing for completion of oil and gas wells with long sections of horizontal wells, if a water layer, strong water flooded layer, mudstone interlayer is drilled or the horizontal section needs to be developed in layers, a packer needs to be lowered for isolation. Flat well packers cannot achieve gravel packing and sand control under the condition of layered isolation. The circulation path of the packer in a conventional horizontal well is only the annulus between the packer and the wellbore. If the circulation path cannot be realized because the tool is blocked, it will cause the risk of pipe sticking and well control. If it is used for gravel packing for sand control, the annulus gap The flow rate in the packer section is small an...

AI Technical Summary

Problems solved by technology

[0002] In the sand control operation of gravel packing for completion of oil and gas wells with long sections of horizontal wells, if a water layer, strong water flooded layer, mudstone interlayer is drilled or the horizontal section needs to be developed in layers, a packer needs to be lowered for isolation. Flat well packer, gravel packing sand control cannot be achieved under the condition of layered isolation

The circulation path of the packer in a conventional horizontal well is only the annulus between the packer and the wellbore. If the circulation path cannot be realized because the tool is blocked, it will cause the risk of pipe sticking and well control. If it is used for gravel packing for sand control, the annulus gap Small, fast flow rate in the packer section, resulting in serious erosion of the well wall and rubber, which may cause wellbore collapse or rubber damage, resulting in failure of isolation or stratification

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