Horizontal well tube exterior subsection gravel filling sand prevention process and pipe column

Abstract

The invention relates to a segmented gravel packing sand prevention technique outside a tube of a horizontal well. A segmented packing packer is adopted to pack an annular space between a sand prevention sieve tube and a tubing into a plurality of well sections which are not communicated with each other, a sand prevention technique tube column is packed by segmented gravel, and the packing of segmented gravel is carried out according to the following technique steps: (A) the gravel is deposited outside the sand prevention sieve tube at the front end of a first stage packing packer after passing through the segmented packing packer, a packing assembly and a packing server from the tubing, and when the packed gravel is deposited and extended below the first stage packing packer, a packing channel of a next well section is automatically opened under the effect of differential pressure; and (B) the step (A) is continuously carried out, and the gravel is deposited and packed section by section progressively. A device comprises an open hole packer, a sand prevention sieve tube outside an oil-string casing in an open hole section, and the segmented packing packer, the packing assembly and the packing server which are sequentially connected on the tubing column in the oil-string casing in the open hole section. The technique has the characteristics of full packing, strongness, high efficiency and the like, and is widely used in the horizontal well sand prevention technique of oil extraction.

Description

1. Technical field [0001] The invention relates to a sand control process device outside an oil production well pipe, in particular to a sand control process and a pipe column for a segmented gravel filling outside a horizontal well pipe. 2. Background technology [0002] The gravel packing sand control outside the oil production well pipe generally adopts the conventional gravel packing method. However, the existing problem is that the sand control section of the horizontal well is long, tens to hundreds of meters, and it is easy to form an early sand bridge at the front end of the screen, so that some well sections cannot be filled with gravel, resulting in poor sand control effect, or even sand control. Failure phenomenon, resulting in the loss or waste of human, material and financial resources. 3. Contents of the invention [0003] The purpose of the present invention is to provide a sand control process of segmented gravel packing outside the horizontal well pipe, w...

AI Technical Summary

Problems solved by technology

However, the existing problem is that the sand control section of the horizontal well is long, tens to hundreds of meters, and it is easy to form an early sand bridge at the front end of the screen, so that some well sections cannot be filled with gravel, resulting in poor sand control effect, or even sand control. Failure phenomenon, resulting in loss or waste of human, material and financial resources

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