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Electrically-flushable packer and electrically-flushable insert seal for flooding well

A technology of well flushing packer and water injection well, which is applied in the directions of sealing/packing, wellbore/well components, earth-moving drilling and production, etc., can solve the problems such as the inability to realize backwashing of water injection wells and the lax closure of the backwashing valve, etc. Achieve the effect of avoiding stratified water injection failure, rapid control and monitoring

Inactive Publication Date: 2013-12-18
CNOOC ENERGY TECH & SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two problems in the above control method: one is that for some water injection layers with small internal and external pressure difference, there is a problem that the backwash valve is not closed tightly, and some water injection wells with uncertain pressure systems cannot be backwashed, such as multi-pipe water injection wells; Second, it cannot be judged on the ground whether the backwash valve is closed properly

Method used

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  • Electrically-flushable packer and electrically-flushable insert seal for flooding well
  • Electrically-flushable packer and electrically-flushable insert seal for flooding well
  • Electrically-flushable packer and electrically-flushable insert seal for flooding well

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Embodiment Construction

[0016] In order to further understand the content of the invention, features and effects of the present invention, the following embodiments are exemplified and described in detail with the accompanying drawings as follows:

[0017] see Figure 1 to Figure 3 , an electric well-flushing packer for water injection wells, comprising an upper central pipe 3, an intermediate joint 7 and a lower central pipe 8 connected in sequence from top to bottom, the upper end of the upper central pipe 3 is connected to the upper joint 1 The lower end is internally connected, the outer lower end of the upper central pipe 3 is internally connected with the upper end of the intermediate joint 7, the lower end of the intermediate joint 7 is internally connected with the upper end of the lower central pipe 8, and the lower central pipe 8 The outside of the lower end of the intermediate joint 7 is connected with the inside of the upper end of the lower joint 13; the outside of the upper end of the i...

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PUM

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Abstract

The invention discloses an electrically-flushable packer and an electrically-flushable insert seal for flooding a well. A well flushing passage and a well flushing passage inlet are respectively formed in each of the packer and the insert seal, the well flushing passage inlet is provided with a back-flush valve, and the back-flush valve is driven by a motor. According to the packer and the insert seal, a pressure difference controlled well flushing mode for the conventional flushable packers / flushable insert seals is broken through, electric control on well flushing operation is realized, and the sealing state of a well flushing valve can be monitored online. The electrically-flushable packer is applicable to cased wells and the electrically-flushable insert seal is applicable to sand-prevented dispensing injection wells of offshore oilfields.

Description

technical field [0001] The invention relates to a downhole tool used in oil fields, in particular to an electric well flushing packer for water injection wells and an electric well flushing insert seal. Background technique [0002] At present, the commonly used downhole well flushing process in the oil field is to use hydraulic control to open the downhole flushable well packer or the flushable well inserting the backflush valve on the seal to realize the backflushing of the well. It mainly relies on the pressure difference to control the switch state of the well flushing channel. The downhole tools used are mainly flushable well packers / well flushable insert seals. This type of well flushable packer / well flushable insert seal is designed with flush The well channel is controlled by the pressure difference between the tubing and the casing to control the opening and closing of the well flushing channel. During normal water injection, the well flushing piston does not move ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/127
Inventor 罗昌华张凤辉刘敏杨万有徐兴安
Owner CNOOC ENERGY TECH & SERVICES
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