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A selection pass-through push-down locator

A technology of locator and positioning boss, which is applied in the direction of wellbore/well components, earthwork drilling and production, etc. It can solve the problems of insufficient reliability of hydraulic locator, and achieve the effects of reasonable force, accurate and reliable positioning, and convenient on-site operation

Active Publication Date: 2020-12-29
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] What the present invention aims to solve is the technical problem of insufficient reliability of conventional mechanical positioners or hydraulic positioners existing in multiple movable pipe strings and repeated positioning operations in well completion and fracturing sand control. The pressure locator, which is used in conjunction with the positioning coupling in the outer pipe string, realizes the accurate positioning of the service pipe string, and the free switch between the pass and no pass of the push, which provides a guarantee for the completion of the filling operation

Method used

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  • A selection pass-through push-down locator
  • A selection pass-through push-down locator
  • A selection pass-through push-down locator

Examples

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Embodiment Construction

[0036] 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:

[0037] Such as figure 1As shown, this embodiment provides a selectable through-type push-down locator, which is composed of an inner and outer two-layer structure that can slide relatively, including an upper joint 1, a sealing ring 2, a gasket 3, a spring 4, an upper mandrel 5, Sliding head 6, upper connecting sleeve 7, gasket 8, lower connecting sleeve 9, reversing sleeve 10, sliding pin 11, sealing ring 12, lower mandrel 13, work cylinder 14, sealing ring 15, lower joint 16; The positioning collar 17 is matched, and the positioning can be repeated many times and selectively positioned by lifting and lowering the pipe string.

[0038] The inner layer structure of the selected pass-through press locator in this embodiment is: the upper join...

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Abstract

The invention belongs to the technical field of oilfield development and production, and discloses a selective passing type pressing-down positioner which is composed of an inner layer structure and an outer layer structure which can slide relative to each other and comprises an upper connector, a first sealing ring, a gasket, a spring, an upper mandrel, a sliding head, an upper connecting sleeve,a gasket, a lower connecting sleeve, a reversing sleeve, a sliding pin, a second sealing ring, a lower mandrel, a working barrel, a third sealing ring and a lower connector. The positioner is connected into a fracturing sand prevention service pipe column during underground operation and matched with a positioning coupling, for switching between positioning and non-positioning, only the pipe column needs to be lifted up and pressed down, the positioned can pass through the positioning coupling in the lifting process, whether to pass through the positioning coupling or not is selected by pressing down, positioning is accurate and reliable, and on-site operation is convenient. In addition, the working barrel adopts a double-positioning structure, so that the positioning accuracy and the resetting reliability are ensured; the gasket is additionally arranged, so that the rotation resistance between the upper section and the lower section of the outer layer structure is reduced, and positioning and non-positioning switching are more flexible; and the load is transmitted in a tension form during pressing-down positioning, so that the stress of the working barrel is more reasonable.

Description

technical field [0001] The invention relates to the technical field of oilfield exploitation, in particular to a press-down locator suitable for well completion and fracturing sand control operations. Background technique [0002] With the further development of oil well production technology, various integrated technologies and high-efficiency operation technologies have developed rapidly, and multi-process continuous operation has become a trend, which will lead to more and more complex operation strings. Especially in the completion sand control operation, the inner and outer pipe strings need to be adjusted multiple times to realize the functions of the various tools in the well, so the accurate positioning and anti-channeling of the pipe strings are very important. For example, in the sand control operation of gravel packing in an open hole, only by accurately locating the relative position of the service string and the outer string can the follow-up sand blasting and r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B23/01
Inventor 张斌包陈义张英王明杰孙飞刘全全闫伟魏爱拴李跃谦闫绅
Owner CHINA NAT OFFSHORE OIL CORP