Toe end screen pipe of horizontal well

Abstract

The invention discloses a toe end screen pipe of a horizontal well. The toe end screen pipe comprises a sand prevention sleeve assembly, an upper joint, and a flow guide screwed plug; the sand prevention sleeve assembly is provided with a first end and a second end in the axial direction; the sand prevention sleeve assembly comprises a rotational flow sleeve and a flow guide sleeve; the rotational flow sleeve sleeves the outside of the flow guide sleeve; the rotational flow sleeve is provided with a rotational flow channel; the rotational flow channel extends in the circumferential direction; the flow guide sleeve is provided with a flow guide channel; an inlet of the flow guide channel communicates with the rotational flow channel through a connecting port; the connecting port is located between the inlet of the rotational flow channel and an outlet of the rotational flow channel; one end of the connecting port is located on the inner wall of the rotational flow sleeve; the upper joint is positioned at a first end of the sand prevention sleeve assembly; the flow guide screwed plug is located at a second end of the sand prevention sleeve assembly; and the upper joint and the flow guide screwed plug are used for axially limiting the sand prevention sleeve assembly. According to the toe end screen pipe of the horizontal well, oil-sand separation can be achieved, and sand setting in the well is effectively prevented.

Description

technical field [0001] This specification relates to the technical field of oil and gas development, in particular to a horizontal well toe screen. Background technique [0002] The descriptions in this section only provide background information related to the disclosure in this specification and may not constitute prior art. [0003] The sand-carrying analysis of oil and gas wellbore shows that due to the heel toe effect of horizontal wells, the toe is more likely to form a sand bed, and the sand filling toe in weakly consolidated sandstone formations reduces the inflow flow at the bottom of the well. The end moves to fill the wellbore, resulting in production shutdown and sand burial accidents. [0004] According to this phenomenon, comprehensive well completion technology requires that a more advanced filter (that is, a filter with complex porous media or high-quality screen) should be installed at the toe end of the horizontal well bottom, and a simple filter can be in...

AI Technical Summary

Problems solved by technology

The distribution of flow channels in the pipe is simple, the function is single, and oil-sand separation cannot be realized. When operating in high-sand production wells, it is easy to form sand deposits and sand plugging at the bottom of the well.

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