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Long well section gravel filling well completion pipe string and technological method

A gravel packing and completion string technology, which is applied in wellbore/well components, earthwork drilling, and fluid production, etc., can solve the problems of incompact filling of the screen tube and the well wall, failure of sand control, and inability to achieve high-efficiency filling.

Active Publication Date: 2019-07-16
PETROCHINA CO LTD
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  • Description
  • Claims
  • Application Information

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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

Method used

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  • Long well section gravel filling well completion pipe string and technological method
  • Long well section gravel filling well completion pipe string and technological method
  • Long well section gravel filling well completion pipe string and technological method

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Embodiment Construction

[0058] In order to make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0059]At present, the horizontal well section with a length of more than 300m can be defined as a long well section. In order to realize the gravel packing completion of the long well section, the embodiment of the present invention provides a long well section gravel packing completion pipe string, and its structural schematic diagram after entering the well is as follows figure 1 As shown, it includes: a drill string 1 , a suspension assembly 2 , a one-way valve 3 , a sand control pipe 4 , an oscillation assembly 5 and a guide 6 .

[0060] Wherein, the suspension assembly 2 includes a first pipe body 21 , a second pipe body 22 , a first connecting pipe 23 , an annular blocking member 24 and a plurality of annular engaging teeth 25 .

[0061] The sec...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/04
CPCE21B43/04
Inventor 刘言理廖兴松李星民聂上振杨延征付大其周宝义张乃彤李怀文王国娜徐禄帆曾晓辉陈长春
Owner PETROCHINA CO LTD
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