Casing collar locator for coiled tubing

A casing coupling and locator technology, applied in casing, drill pipe, drilling equipment and other directions, can solve the problems of fracturing pipe stuck in series, inaccurate positioning, production accidents, etc., and achieves easy disassembly and maintenance, and large space. , the effect of simple tool structure

Inactive Publication Date: 2019-01-22
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the existing casing collar positioner is dragging and fracturing, the groove is easy to enter the fracturing sand, and the fracturing sand will fill the gap in the groove, so that the positioning block cannot be recovered smoothly when passing through the casing collar. Inaccurate positioning or even the entire fracturing pipe string gets stuck, resulting in production accidents, affecting construction efficiency and increasing construction costs

Method used

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  • Casing collar locator for coiled tubing
  • Casing collar locator for coiled tubing
  • Casing collar locator for coiled tubing

Examples

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Embodiment Construction

[0015] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0016] Such as figure 1 As shown, the conventional coiled tubing sandblasting and perforating staged fracturing string mainly includes coiled tubing joints 2, throwing hands 3, centralizers 4, perforating guns 5, packers 6, casing collar positioners 7, Guide head 8. During the fracturing process, a large amount of fracturing sand will sink in the wellbore. When the conventional casing collar positioner moves up and down with the coiled tubing string in the casing, the groove is not sealed and is in an open state. The fracturing sand It will enter the groove with the liquid and even fill the groove, which will affect the elastic change of the shrapnel and then affect the stroke of the positioning block in the groove, and even the positioning block cannot be recovered, causing the pipe string to be stuck at the casing collar, resulting in ACCIDE...

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Abstract

The invention discloses a casing collar locator for coiled tubing. The casing collar locator comprises a tool body, an upper pressing cap, a plurality of elastic pieces and positioning blocks. The tool body is cylindrical, the inner wall is in drift diameter, the outer portion of the outer wall is provided with an external thread, the lower portion of the outer wall is provided with a step expanding section, a plurality of grooves are uniformly and axially distributed along the step outer periphery of the upper portion of the expanding section, and a necking guide head end is formed on the lower outer side of the expanding section. The inner wall of the upper pressing cap is provided with an internal thread, the outer lower portion is provided with grooves fittingly opposite to the groovesof the expanding section, the elastic pieces are mounted in a groove of the upper pressing cap corresponding to the body under the action of elasticity after the upper pressing cap is tightened, andthe positioning blocks protruding outer surfaces of the elastic pieces are fixed to middles of the elastic pieces respectively. Influences on normal operation after sand filling of grooves of conventional casing collar locators are avoided. The casing collar locator is simple and reliable in structure and easy in demounting and maintenance, and an intrinsic guide function of the bottom of the toolbody is achieved.

Description

technical field [0001] The invention relates to the field of well completion engineering of unconventional oil and gas reservoirs such as petroleum and natural gas, in particular to a casing collar positioner for coiled tubing. Background technique [0002] Coiled tubing drag fracturing technology has been widely used abroad because it can realize large-scale reconstruction, layered fracturing, fixed-point fracturing, and fine fracturing, and domestic oilfield companies are also gradually promoting it. application of this technology. [0003] The existing casing collar locator for coiled tubing adopts grooves evenly distributed on the outer wall of the body, and the grooves are embedded with shrapnel and positioning blocks. When the pipe string passes through the casing collar, the positioning block will be stuck when passing through the joint of the casing collar. Under the action of the tension of the coiled tubing and the deformation of the shrapnel, the positioning bloc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B23/01E21B17/08
CPCE21B17/085E21B23/01
Inventor 杨晓勇刘志斌冯强丁柯宇周后俊秦诗涛李梅李娜王治华张华吕双
Owner CNPC BOHAI DRILLING ENG
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