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Branch well reentering tool

A technology for re-entry and branch wells, applied in wellbore/well components, surveying, earth-moving drilling, etc., to increase the diameter, save time, and reduce wear and tear

Inactive Publication Date: 2005-06-08
SHENGLI PETROLEUM ADMINISTRATION BUREAU DRILLING TECH ACAD SINOPEC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the existing branch well drilling technology, the present invention solves the problem that when the existing branch well re-enters, it is necessary to reserve a guide device or run a deflector for guidance, and it can select It can enter each branch wellbore in a timely manner, completely solving the problem of selective re-entry after completion of branch wells

Method used

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Embodiment Construction

[0011] The present invention will be further described now in conjunction with the accompanying drawings of the description.

[0012] The branch well re-entry tool is mainly composed of a body 1, a diverter plate 2, a flow rod 3, a piston 5, a push block 6, a pressure plate 8, a push rod 10, and a guide head 12, such as figure 1 As shown, one of the ends of the body 1 is a female buckle, and a step is processed at the bottom of the female buckle. On the step, there is a diverter plate 2. There are 2-6 flow channel holes 13 in the circumferential direction of the diverter plate 2. The flow rod 3 is hung on the diverter through the center hole. The upper and lower ends of the plate 2 are inserted into the upper cavity of the piston 5 to guide the fluid into the piston cavity smoothly. The upper cavity of the piston 5 is equipped with a carbide nozzle 4, and the piston 5 and the body 1 are sealed by a sealing ring 15. They are all installed in the body In the inner chamber, a key...

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Abstract

This invention discloses a tool reentering the branch well, used in completion operation in oil gas branch well in the industry of petro well-drilling. This tool consists of body, flow distribution plate, flow rod, piston, push block, press plate, push rod and guide head. When operated, this invention is put into the well connected with the lower part of completion limb or oil limb; when it approaches the predefined window of the branch well, the driven well pump should be started and a fall of pressure which works on the piston will push the push rod that deflects the guide head in a certain angle. When it continues going down, the limb should be rotated and the guide head will guide the limb into the branch well.

Description

technical field [0001] The invention relates to a branch well re-entry tool, which belongs to the downhole well completion tool in the branch well completion operation in the petroleum geology drilling industry. technical background [0002] The so-called branch well is to drill more than two wellbores in one main wellbore. Compared with the relatively mature horizontal well and sidetracking horizontal well technology at present, it has greater advantages. The advantage of increasing the oil drainage area, tap the potential of remaining oil, enhance the recovery rate, and improve the effect of oil field development. On the other hand, one main borehole can be used to exploit two or more oil layers or the same oil layer in different directions at the same time, which saves investment compared with horizontal wells while better producing reserves. Branch well technology has become a leading technology for crude oil extraction. [0003] However, in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B23/00E21B47/024
Inventor 王智锋王敏生李作会
Owner SHENGLI PETROLEUM ADMINISTRATION BUREAU DRILLING TECH ACAD SINOPEC
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