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Double-pipe sealing tool and sealing method thereof

A tube sealing and tool technology, applied in the field of double tube sealing tools and their sealing, can solve the problems of inaccessible branch wellbore intervention and isolation, etc.

Pending Publication Date: 2022-05-10
CNOOC ENERGY TECH & SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention overcomes the deficiencies in the prior art. The single-pipe well completion cannot intervene and isolate the branch wellbore, and there are problems of interlayer and water flooding. It provides a double-pipe sealing tool and a sealing method thereof. The double-pipe sealing The tool can realize the separate production tool with complete hydraulic seal to enter the main and branch wellbore at the same time, so as to meet the requirements of separate production and pressure integrity of the main and branch wellbore

Method used

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  • Double-pipe sealing tool and sealing method thereof
  • Double-pipe sealing tool and sealing method thereof
  • Double-pipe sealing tool and sealing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A double-pipe sealing tool, including a guide 1, a rotary guide shoe assembly 2, a flushing pipe 3, a guide slant iron 4, a half-moon ring 5, a shear sleeve 6, a positioning sleeve 9 and a separate production string in a branch wellbore,

[0031] On the upper outer wall of the guide 1, elastic claws 31 for cooperating with the connector to realize positioning and locking are evenly arranged, and a "ladder" type semicircular window 18 is opened on the middle side wall of the guide 1, guiding the tail end of the inclined iron 4 Inserted into the guide 1 below the "ladder" type semicircular window 18, the half-moon ring 5 is arranged in the lower part of the guide 1, and the outer wall of the middle and lower part of the half-moon ring 5 forms a reduced diameter section, and the outer wall of the reduced diameter section and the guide 1 An annular space is formed between the inner walls of the ring space, and a shear sleeve 6 is arranged in the annular space. The shear slee...

Embodiment 2

[0033] On the basis of Embodiment 1, the branch wellbore separate production string includes a locking joint 10, an intermediate module 11 and a down shoe 12, the inner wall of the head end of the locking joint 10 is threadedly connected with the outer wall of the tail end of the flushing pipe 3, and the locking joint 10 The outer wall of the tail end is threadedly connected with the inner wall of the head end of the middle module 11, and the outer wall of the middle module 11 is provided with a branch well positioning seal 8, and the outer wall of the tail end of the middle module 11 is screwed with the inner wall of the head end of the lower guide shoe 12.

[0034] The locking joint 10 and the half-moon ring 5 are clearance-fitted, and a first shearing groove 27 is opened on the middle outer wall of the locking joint 10, and a second shearing pin hole is opened on the side wall of the half-moon ring 5, and the second shearing pin 15 penetrates The second shearing pin hole ext...

Embodiment 3

[0037] On the basis of Embodiment 2, the tail end of the guide slant iron 4 is clearance-fitted with the guide 1, and the first fixing pin hole 19 is evenly opened on the side wall of the guide 1 below the "ladder" semicircular window 18, and the first fixing pin hole 19 is evenly opened in the guide The side wall of the tail end of the inclined iron 4 is provided with a first fixed pin groove, and the second fixed pin 17 penetrates through the first fixed pin hole 19 and extends into the first fixed pin groove, so as to realize fixing the guiding inclined iron 4 and the guider 1 purpose of the connection.

[0038] A second shear groove is provided on the outer wall of the middle part of the half-moon ring 5, and a first shear pin hole is evenly opened on the side wall of the shear sleeve 6, and the first shear pin 14 extends through the first shear pin hole. In the second shear groove, in order to achieve the purpose of fixed connection between the half-moon ring 5 and the shea...

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Abstract

According to the double-pipe sealing tool and the sealing method thereof, an elastic claw is arranged on the outer wall of the upper portion of a guider, a ladder-shaped semicircular window is formed in the side wall of the middle portion of the guider, the tail end of guiding inclined iron is inserted into the guider below the ladder-shaped semicircular window, a half-moon ring is arranged in the lower portion of the guider, and the tail end of the guiding inclined iron is inserted into the half-moon ring. A reducing section is formed on the outer wall of the lower middle portion of the half-moon ring, an annular space is formed between the outer wall of the reducing section and the inner wall of the guider, a shearing sleeve is arranged in the annular space and connected with the guider and the half-moon ring, a locking block hole is formed in the inner wall of the lower portion of the half-moon ring, and a locking block is arranged in the locking block hole. The positioning sleeve is installed in the middle of the inner wall of the half-moon ring, the washing pipe extends into the guider from the head end of the guider, and the tail end of the washing pipe is connected with the head end of the positioning sleeve. According to the double-pipe sealing tool, a separate mining tool with complete hydraulic sealing can enter a main well hole and a branch well hole at the same time, so that the requirements of separate mining and pressure completeness of the main well hole and the branch well hole are met.

Description

technical field [0001] The invention relates to the technical field of upper completion of double pipes in the oil field, and more specifically relates to a double pipe sealing tool and a sealing method thereof. Background technique [0002] At present, most of the multi-lateral wells commonly used in offshore oilfields are completed by single-tube completion, which cannot intervene and pressure-isolate the production layers of the lateral wellbore, which may easily lead to interbedded layers and water flooding. Contents of the invention [0003] The invention overcomes the deficiencies in the prior art. The single-pipe well completion cannot intervene and isolate the branch wellbore, and there are problems of interlayer and water flooding. It provides a double-pipe sealing tool and a sealing method thereof. The double-pipe sealing The tool can realize the separate production tool with complete hydraulic seal to enter the main and branch wellbore at the same time, so as to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/12
CPCE21B33/1208
Inventor 郝宙正闫伟左凯陈杰刘晓峰李跃谦柴希伟陈立伟
Owner CNOOC ENERGY TECH & SERVICES