Downhole power generation device and separate-zone waterflooding device

Patent metadata

Field	Value
Publication number	US-10890052-B2
Application number	US-201816053568-A
Country	US
Kind code	B2
Filing date	Aug 2, 2018
Priority date	Mar 23, 2018
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

A downhole power generation device and a separate-zone waterflooding device, which relate to the field of oil and gas development technologies. The downhole power generation device comprises a housing extended axially and a rotating wheel, a striking mechanism and a piezoelectric bimorph provided in the housing. The piezoelectric bimorph is axially extended and circumferentially distributed around an axis of the housing, with one end of the piezoelectric bimorph being fixed. The rotating wheel is in transmission connection with the striking mechanism and can be rotated by fluid to drive the striking mechanism to rotate. The striking mechanism can touch the other end of the piezoelectric bimorph during rotation so that the piezoelectric bimorph vibrates back and forth.

First claim

The invention claimed is:

1. A downhole power generation device, comprising:
a housing having an axis, wherein the housing extends along the axis; and
a rotating wheel provided in the housing, a striking mechanism provided in the housing and a piezoelectric bimorph provided in the housing, wherein the piezoelectric bimorph is axially extended and circumferentially distributed around the axis of the housing, a first end of the piezoelectric bimorph is fixed, the rotating wheel is in transmission connection with the striking mechanism, the rotating wheel is rotated by fluid to drive the striking mechanism to rotate, and the striking mechanism touches a second end of the piezoelectric bimorph during rotation so that the piezoelectric bimorph vibrates back and forth,
further comprising a lower guide vane mechanism sleeving a shaft of the rotating wheel and located downstream of the rotating wheel, wherein the lower guide vane mechanism comprises a plurality of radially extended lower guide vane portions which are fixedly connected to the housing.

2. The downhole power generation device according to claim 1 , wherein a connecting member is connected to the lower guide vane to fix the first end of the piezoelectric bimorph.

3. The downhole power generation device according to claim 2 , wherein the connecting member further comprises a plurality of connecting members, wherein two of the plurality of connecting members clamp the piezoelectric bimorph, and wherein a side surface of a first of the two connecting members, the first of the two being positioned further away from the piezoelectric bimorph, is an arc surface.

4. The downhole power generation device according to claim 1 , wherein the housing comprises an upper outer barrel and a lower outer barrel connected to the upper outer barrel, and wherein the lower guide vane mechanism is fixed to a joint between the upper outer barrel and the lower outer barrel.

5. The downhole power generation device according to claim 1 , further comprising an upper guide vane mechanism sleeving a shaft of the rotating wheel and located upstream of the rotating wheel.

6. The downhole power generation device according to claim 1 , wherein the second end of the piezoelectric bimorph is connected to a counterweight member.

7. The downhole power generation device according to claim 6 , wherein the counterweight member is connected to a touched member which is touched by the striking mechanism during rotation.

8. The downhole power generation device according to claim 7 , wherein a guiding member is provided in the housing, wherein the guiding member has a guiding groove perpendicular to the radial direction of the housing, and wherein the touched member is embedded into the guiding groove.

9. The downhole power generation device according to claim 8 , wherein the piezoelectric bimorph further comprises three piezoelectric bimorphs and an angle between two adjacent piezoelectric bimorphs is 120 degrees, and wherein the device further comprises three guiding members and an angle between the guiding grooves of two adjacent guiding members is 60 degrees.

10. A separate-zone waterflooding device, comprising a downhole power generation device according to claim 1 .

Assignees

• Petrochina Co Ltd

Inventors

• Pei Xiaohan
• Yang Qinghai
• Shan Dongbai
• Li Tao
• Ming Eryang
• Li Ming

Classifications

• E21B43/20

  Displacing by water · CPC title

• H02N2/186

  Vibration harvesters · CPC title

• E21B41/0085 Primary

  Adaptations of electric power generating means for use in boreholes · CPC title

• H02N2/185 Primary

  using fluid streams · CPC title