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One-time multi-layer gravel packing operation method for long-span perforation section

A technology of gravel packing and perforation section, which is applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc. It can solve the problems of inability to complete the super-long operation of the center pipe and large fluid friction, and increase the cumulative construction length , Reduce the effect of liquid circulation friction

Active Publication Date: 2021-08-31
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the two-layer pipe structure of the service string, the liquid friction is relatively large, and it is impossible to complete the operation of the super-long central pipe

Method used

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  • One-time multi-layer gravel packing operation method for long-span perforation section
  • One-time multi-layer gravel packing operation method for long-span perforation section
  • One-time multi-layer gravel packing operation method for long-span perforation section

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Embodiment Construction

[0064] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0065] see Figure 1 to Figure 7 , a multi-layer gravel packing operation method in a long-span perforation section, the long-span perforation section is provided with an upper perforation layer, zero to multiple middle perforation layers and a bottom perforation layer, the operation method adopts the following step:

[0066] 1) Set a grit settling packer 16 inside the casing 1 and at the bottom of the long-span perforation section.

[0067] 2) Assemble the top packer assembly of the outer pipe string and the main part of the outer pipe string on the ground, and then hang the main part of the outer pipe string at the wellhead; run the service pipe string into the outer pipe string while assembling In the main part of the string, in the proc...

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Abstract

The invention discloses a one-time multi-layer gravel packing operation method in a long-span perforation section, which adopts the following steps: 1) setting and sealing a sand settling packer; The pipe string, the screen pipe on the outer pipe string, the inner liner and the production circulation sliding sleeve form a double-layer pipe structure, and all the connecting pipe strings of the service pipe string except the filling tool are of a single-layer structure; 3) from bottom to top Sand control operation is carried out layer by layer; 4) Lift the service pipe string out of the casing to start oil production. The invention can be used for one-time multi-layer gravel packing and fracturing sand control operation in the long-span perforation section, and can realize layered production without running into the lower completion production pipe string.

Description

technical field [0001] The invention relates to the technical field of sand control in oil production wells, in particular to a one-time multi-layer gravel packing operation method in a large-span perforation section. Background technique [0002] For unconsolidated sandstone production wells, during the production process, when the produced fluid flows into the wellbore, some formation sand will be carried into the wellbore, which will endanger the electric pump and production equipment. In order to prevent oil wells from producing sand, independent screens or gravel packing are commonly used for sand control. [0003] For some production wells, while controlling sand, it is hoped that a certain scale of fracturing operations can be carried out to achieve the purpose of establishing formation fractures and increasing formation output. Currently, fracturing operations for loose sandstone wells are generally carried out at the same time as sand and gravel packing operations. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/04
CPCE21B43/04
Inventor 万祥张少朋李君宝马英文韦龙贵韩耀图王允海和鹏飞许迪董潇琳
Owner CHINA NAT OFFSHORE OIL CORP
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