Gravel Pack Completion String and Technology in Long Well Section

Abstract

The invention discloses a long well section gravel filling well completion pipe string and a technological method, and belongs to the technical field of well completion in oil and gas field development. The pipe string comprises a drill pipe string (1), a suspension assembly (2), a one-way valve (3), a sand blocking pipe (4), an oscillation assembly (5) and a guide piece (6), the suspension assembly (2) comprises a first pipe body (21), the drill pipe string (1), a second pipe body (22) and the oscillation assembly (5) which are sequentially connected, and the oscillation assembly (5) is usedfor vibrating liquid when passing through the oscillation assembly; and the first pipe body (21), the sand blocking pipe (4) and the guide piece (6) are sequentially connected. According to the long well section gravel filling completion pipe string, by means of the oscillation effect of the oscillation assembly (5), the compactness of a long well section gravel filling layer (7) is fully guaranteed, the long well section gravel filling efficiency is improved, and the sand prevention completion efficiency is guaranteed.

Description

technical field [0001] The invention relates to the technical field of well completion in the development of oil and gas fields, in particular to a long well segment gravel-packed well completion pipe string and a process method. Background technique [0002] Horizontal well openhole gravel packing technology, as one of the more advanced sand control technologies, has become the dominant technology for horizontal wells in unconsolidated sandstone reservoirs. This technology can ensure that the horizontal well section has the largest drainage area, effectively play a role in sand control, and provide strong support for the well wall, which can realize long-term and efficient development of oil wells. [0003] At present, for the horizontal well section with a length of more than 300m, the general packing method is usually used to pack gravel into the gravel pack layer. However, this kind of filling method does not consider that the gravel will settle and accumulate during th...

AI Technical Summary

Problems solved by technology

However, this kind of filling method does not consider that the gravel will settle and accumulate during the filling process, making the filling port prone to blockage, which will easily lead to incomplete filling between the screen pipe and the well wall, and cannot achieve high-efficiency filling, eventually resulting in sand control. fail

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