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A double-sliding sleeve setting and locking mechanism based on a compression packer

A technology of compression packer and sliding sleeve, which is applied in sealing/isolation, wellbore/well components, earthwork drilling and production, etc., and can solve problems such as rubber cylinder compression, oil casing liquid level difference, water hammer pressure, etc.

Active Publication Date: 2019-11-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, compression packers such as Y111 are commonly used in casing completion horizontal wells for interlayer separation fracturing. When this type of packer enters the well, friction between the large-sized tool in the pipe string and the well wall will generate resistance, which may make the glue At the same time, when the conventional tubing is running in, a certain level difference of the oil casing and water hammer pressure will be generated due to the fast running speed, so that the pressure required for starting the hydraulic anchor in the string is relatively low. If the tool is opened halfway, it will cause obstacles in drilling, abnormal wear of the tool, etc.
[0003] With the existing technology, the problems of oil casing liquid level difference and water hammer pressure during running in can be controlled by reducing the flow area in the tool, but the existing structure of locking the setting mechanism through the locking block has unstable performance, Does not have many disadvantages such as sand control function

Method used

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  • A double-sliding sleeve setting and locking mechanism based on a compression packer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment provides a compression packer double-sliding sleeve setting and locking mechanism, such as figure 1 As shown, the double sliding sleeve setting locking mechanism 15 at least includes a central tube 3, a first sliding sleeve 6, a second sliding sleeve 10 and a protective cap 12. The first sliding sleeve 6 and the second sliding sleeve 10 pass through several The first scissors 9 are fixedly connected, the first sliding sleeve 6 and the central tube 3 are fixed by the second scissors 8, and the lower end of the central tube 3 is radially evenly distributed with a number of holes and built-in locking blocks 7, which are fixed on the central tube 3 The top protrudes outward, and can produce radial movement on the central tube 3. The bottom of the central tube 3 is threaded with the protective cap 12. There is a certain axial gap between the central tube 3 and the protective cap 12, which is used to fix the C-shaped ring 11. Axial displacement.

[0024] This...

Embodiment 2

[0029] On the basis of Embodiment 1, the outer surface of the first sliding sleeve 6 is provided with two annular grooves at the upper end and the lower end. At the height of the central pipe 3, the width of the groove at the lower end is larger than that of the C-ring 11. Before the compression packer is set, the protrusion of the locking block 7 is pushed against the groove at the upper end.

[0030] The space between the first sliding sleeve 6 and the second sliding sleeve 10 and the upper ends of the central tube 3 and the first sliding sleeve 6 are all sealed by sealing rings, and the equivalent shear surfaces of all the second shear pins 8 are less than or equal to all the first shear pins 8 The equivalent shear surface of a shear pin 9; the inner diameter of the C-shaped ring 11 in a free state is smaller than the outer diameter of the lower end of the first sliding sleeve 6, and the outer diameter of the C-shaped ring 11 is greater than the inner diameter of the lower e...

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Abstract

The invention designs a compressed packer based double-sliding-sleeve type set locking mechanism. The mechanism comprises at least a center pipe, a first sliding sleeve, a second sliding sleeve and aprotecting cap, wherein the first sliding sleeve and the second sliding sleeve are fixedly connected through a plurality of first shear pins; the first sliding sleeve and the center pipe are fixed through second shear pins; a plurality of holes in which locking blocks are arranged are radially uniformly formed in the lower end of the center pipe; the locking blocks are outwards protruded on the center pipe and can radially move on the center pipe; the bottom part of the center pipe is connected to the protecting cap. According to the mechanism, a plurality of shortages of unstable performancesand invalid sand preventing function of an existing compressed packer structure that a setting mechanism is locked through the locking blocks can be overcome; the two sliding sleeve and the shear pins for fixing the two sliding sleeve are provided; the liquid level difference of an oil sleeve is controlled during drilling, so that the level of the liquid in an oil pipe is lower than the annular liquid level of the oil sleeve, and as a result, the water hammer pressure in a tool is decreased; in addition, the packer is prevented from setting in the middle of drilling through the double-sliding-sleeve type locking mechanism; and meanwhile, the sand preventing function is ensured.

Description

technical field [0001] The invention relates to a sliding sleeve setting and locking mechanism applied to a packer, in particular to a double sliding sleeve setting and locking mechanism based on a compression packer. Background technique [0002] At present, compression packers such as Y111 are commonly used in casing completion horizontal wells for interlayer separation fracturing. When this type of packer enters the well, friction between the large-sized tool in the pipe string and the well wall will generate resistance, which may make the glue At the same time, when the conventional tubing is running in, a certain level difference of the oil casing and water hammer pressure will be generated due to the fast running speed, so that the pressure required for starting the hydraulic anchor in the string is relatively low. If the tool is opened halfway, it will cause obstacles in drilling and abnormal wear of the tool. [0003] With the existing technology, the problems of oi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/128
Inventor 田文超张文苏敏文邓小强隆世明廖作杰李星星王伟鹏侯俊耀徐孝山张海涛李铭张波李景彬宫娜娜王建树许金正孙勇峰
Owner BC P INC CHINA NAT PETROLEUM CORP
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