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Power-flushable packers and power-flushable insert seals for water injection wells

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 of inability to realize backwashing of water injection wells, and the backwash valve is not tightly closed, etc. Achieve the effect of avoiding stratified water injection failure, rapid control and monitoring

Inactive Publication Date: 2016-02-10
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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  • Power-flushable packers and power-flushable insert seals for water injection wells
  • Power-flushable packers and power-flushable insert seals for water injection wells
  • Power-flushable packers and power-flushable insert seals for water injection wells

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Embodiment Construction

[0016] 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:

[0017] see Figure 1 ~ Figure 3 , an electric washable packer for water injection wells, comprising an upper central pipe 3, an intermediate joint 7 and a lower central pipe 8 sequentially connected 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 lower end of the upper central pipe 3 is connected internally with the upper end of the intermediate joint 7, the lower end of the intermediate joint 7 is externally 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 lower joint 13 is connected to the inside of the upper end; the outside of the upper end of the intermediate joint 7 is conne...

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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 an oil field, in particular to an electric well flushable packer and an electric well flushable insert seal for a water injection well. Background technique [0002] At present, the commonly used downhole flushing process in the oil field is to use hydraulic control to open the downhole flushable packer or to insert the backwash valve on the seal to realize the backwash well. Mainly rely on the pressure difference to control the opening and closing state of the well flushing channel. The downhole tools used are mainly flushable well packers / flushable well insert seals. This type of flushable well packer / flushable well insert seals are designed The well passage is controlled by the pressure difference between the tubing and the casing to open and close the well flushing passage. During normal water injection, the well flushing piston does not move due to the positive pressure difference between the oil p...

Claims

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Application Information

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Patent Type & Authority Patents(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