Staged cementing device and staged cementing method

Patent metadata

Field	Value
Publication number	US-11952860-B2
Application number	US-202117995799-A
Country	US
Kind code	B2
Filing date	Feb 1, 2021
Priority date	Jun 28, 2020
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

A staged cementing device includes a cylindrical body having an inner chamber. A circulating opening and a liquid inlet recess open to the inner chamber are arranged on a wall of the body. An opening assembly is arranged in the body, which has an opening sleeve and an opening seat located in the opening sleeve. Initially the opening sleeve is connected with the body through a first shear pin and covers the circulating opening, and the opening seat is connected with the opening sleeve through a second shear pin and covers the liquid inlet recess. A packer includes a packing valve body and a packer rubber. The packing valve body includes a flow channel in communication with the liquid inlet recess, and the packer rubber includes a liquid reservoir in communication with the flow channel. The second shear pin is sheared off in response to primary cementing procedure.

First claim

The invention claimed is:

1. A staged cementing device ( 10 ), comprising:
a body ( 100 ) having an inner chamber ( 110 ), a circulating opening ( 120 ) extending through a wall of the body, and a liquid inlet recess ( 130 ) open to the inner chamber and formed on the wall of the body;
an opening assembly ( 300 ) arranged in the body, the opening assembly comprising an opening sleeve ( 310 ) and an opening seat ( 320 ) located in the opening sleeve ( 310 ), wherein in an initial state, the opening sleeve ( 310 ) is connected with the body ( 100 ) through a first shear pin ( 180 ) and covers the circulating opening ( 120 ), and the opening seat ( 320 ) is connected with the opening sleeve ( 310 ) through a second shear pin ( 182 ) and covers the liquid inlet recess ( 130 ); and
a packer ( 200 ), wherein the packer ( 200 ) comprises a packing valve body ( 210 ) connected with a downstream end of the body, and a packer rubber ( 220 ) arranged downstream of the packing valve body, the packing valve body ( 19 ) comprises a flow channel ( 230 ) in communication with the liquid inlet recess ( 130 ), and the packer rubber ( 220 ) comprises a liquid reservoir ( 240 ) in communication with the flow channel ( 230 ), wherein the liquid reservoir ( 240 ) contains an accelerant for a swelling fluid,
wherein the second shear pin ( 182 ) is configured to be sheared off in response to a primary pressure build-up in the body ( 100 ), causing the opening seat ( 320 ) to move downward to open the liquid inlet recess ( 130 ) so that the swelling fluid in the inner chamber ( 110 ) of the body ( 100 ) enters the liquid reservoir ( 240 ) through the liquid inlet recess ( 130 ) and the flow channel ( 230 ) and reacts with the accelerant in the liquid reservoir ( 240 ).

2. The staged cementing device according to claim 1 , wherein the swelling liquid is a part of displacing fluid.

3. The staged cementing device according to claim 1 , wherein the primary pressure build-up is achieved by putting down an opening tool ( 400 ) engageable with the opening seat ( 320 ).

4. The staged cementing device according to claim 3 , wherein a receiving seat ( 330 ) is further provided at a downstream end of the opening sleeve ( 310 ) for restricting a distance of downstream movement of the opening seat ( 320 ).

5. The staged cementing device according to claim 1 , wherein the liquid inlet recess ( 130 ) is configured as a groove formed in an inner wall of the body ( 100 ), wherein the flow channel ( 230 ) is formed in a wall of the packing valve body ( 210 ) and extends axially throughout the packing valve body ( 210 ).

6. The staged cementing device according to claim 1 , wherein the packer ( 200 ) further comprises a base pipe ( 250 ) fixedly connected with the packing valve body ( 210 ), wherein the base pipe ( 250 ) is located radially inside the packer rubber ( 220 ), and the liquid reservoir ( 240 ) is formed by a gap between the base pipe and the packer rubber.

7. The staged cementing device according to claim 6 , wherein two supporting sleeves ( 260 ) separated from each other are provided on an outer surface of the packer rubber ( 230 ), thereby defining an axial area where the packer rubber ( 230 ) expands.

8. The staged cementing device according to claim 1 , wherein the first shear pin ( 180 ) is configured to be sheared off in response to a secondary pressure build-up in the body ( 100 ), which causes the opening sleeve ( 310 ) to move downstream, thereby opening the circulating opening ( 120 ) and closing the liquid inlet recess ( 130 ).

9. The staged cementing device according to claim 1 , wherein a closing sleeve ( 450 ) is provided upstream of the opening sleeve ( 310 ), and connected with the body ( 100 ) through a third shear pin ( 184 ),
wherein the third shear pin ( 184 ) is configured to be sheared off in response to a tertiary pressure build-up in the body ( 100 ) causing the closing sleeve ( 450 ) to move downstream to close the circulating opening ( 120 ).

10. The staged cementing device according to claim 9 , wherein a closing seat ( 460 ) is provided in the closing sleeve ( 450 ), and the tertiary pressure build-up is achieved through putting down a closing tool ( 410 ) engageable with the closing seat ( 460 ).

11. The staged cementing device according to claim 9 , wherein an elastic member ( 462 ) is provided on an outer wall of the closing sleeve ( 450 ), and an elastic-member receiving groove ( 118 ) is provided in the inner wall of the body for receiving the elastic member ( 462 ) and maintaining a position of the closing sleeve ( 450 ) after the closing sleeve ( 450 ) closes the circulating opening ( 120 ).

12. The staged cementing device according to claim 1 , wherein the packer rubber is made of hydrocarbon-expansible rubber.

13. A staged cementing method with the staged cementing device according to claim 11 , comprising steps of:
putting down an opening tool ( 400 ) in the staged cementing device to engage with the opening seat ( 320 ), and shearing off the second shear pin ( 182 ) through the primary pressure build-up, so that the opening seat ( 320 ) moves downstream to open the said liquid inlet ( 130 );
causing the swelling liquid to enter the liquid reservoir ( 240 ) through the inner chamber ( 110 ) of the body ( 100 ), the liquid inlet recess ( 130 ) and the flow channel ( 230 ), thereby causing the packer rubber ( 220 ) to expand;
shearing off the first shear pin ( 180 ) through the secondary pressure build-up so that the opening sleeve ( 310 ) moves downstream to open the circulating opening ( 120 ), and at the same time communication between the liquid inlet recess ( 130 ) and the flow channel ( 230 ) is cut off; and
putting down the closing tool ( 410 ) to be in engagement with the closing seat ( 460 ), and shearing off the third shear pin ( 184 ) through the tertiary pressure build-up, so that the closing sleeve ( 450 ) moves downstream to close the circulating opening ( 120 ).

14. The staged cementing method according to claim 13 , wherein the swelling fluid reacts with the accelerant in the liquid reservoir ( 240 ).

Assignees

• China Petroleum & Chem Corp
• Sinopec Petroleum Engineering Tech Research Institute Co Ltd

Inventors

• Qin Jinli
• Liu Yang
• Chen Wujun
• Liu Ben
• Guo Zhaohui
• Zeng Yanjun
• Liu Ming
• Yang Dekai
• Zhu Yujie
• Liao Hongqian

Classifications

• E21B33/146 Primary

  Stage cementing, i.e. discharging cement from casing at different levels · CPC title

• E21B33/126

  with fluid-pressure-operated elastic cup or skirt (E21B33/122, E21B33/124 take precedence) · CPC title

• E21B34/14

  operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools {(E21B34/066 takes precedence)} · CPC title

• E21B33/12

  Packers; Plugs (used for cementing E21B33/134, E21B33/16) · CPC title

• E21B33/127 Primary

  with inflatable sleeve (E21B33/122, E21B33/124 take precedence) · CPC title