Gravel filling device and gravel filling method

Abstract

The invention discloses a gravel filling device and a gravel filling method, and belongs to the technical field of oil field exploitation. The device comprises a filling outer tubular column and multiple filling inner tubular columns. The filling outer tubular column comprises a first casing string, multiple filling assemblies and a first guiding assembly, the filling assemblies correspond to thefilling inner tubular columns one to one, each filling assembly comprises a packer, a screening tube and a first filling structure, and each filling inner tubular column comprises a second casing string, a second filling structure and a second guiding assembly. A first annular space between the inner wall of a horizontal well section and the filling outer tubular column can be divided into multiple secondary annular spaces by the packers, the secondary annular spaces correspond to the filling inner tubular columns one to one, gravel filling is conducted on the secondary annular spaces by adopting the filling inner tubular columns corresponding to the secondary annular spaces, and therefore the problems of low gravel filling efficiency, poor sand resisting effect and short sand resisting service life are effectively solved.

Description

technical field [0001] The invention relates to the technical field of oilfield exploitation, in particular to a gravel filling device and a gravel filling method. Background technique [0002] Horizontal well openhole gravel packing technology, as one of the more advanced sand control methods, has become the leading technology for horizontal well completion in unconsolidated sandstone reservoirs. This technology realizes the largest drainage area in the horizontal well section, effectively plays the role of sand control, provides strong support for the well wall, and realizes long-term and efficient development of oil wells. [0003] However, for long horizontal well sections (for example, the length is greater than 400 meters), it is difficult to pack the gravel pack compactly by the traditional general packing method, and problems such as low gravel packing rate, poor sand control effect and short sand control life are prone to occur. . Therefore, there is an urgent nee...

AI Technical Summary

Problems solved by technology

It can solve the problems of low gravel packing rate, poor sand control effect and short sand control life in the prior art when gravel packing is carried out for long horizontal well sections. The technical scheme is as follows:

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