Disposable antifouling covers for geophysical survey equipment

• US 10,459,116 B2
• Filed: 08/31/2016
• Issued: 10/29/2019
• Est. Priority Date: 05/07/2013
• Status: Active Grant

• Current Assignee: PGS Geophysical As (PGS ASA)
• Original Assignee: PGS Geophysical As (PGS ASA)
• Inventors: Karlsen, Kenneth
• Primary Examiner(s): Murphy, Daniel L
• Application Number:
  US15/252,816
• Publication Number:
  US 20160370497A1
• Time in Patent Office: 1,154 Days
• Field of Search: 367 15
• CPC Class Codes: G01V 1/3826 dynamic steering, e.g. by paravanes or birds
• CPC Class Codes: G01V 1/3843 Deployment of seismic devices, e.g. of streamers equipment for marine deployment in general B63B
• CPC Class Codes: G01V 13/00 Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups G01V1/00 – G01V11/00

Abstract

Disposable antifouling covers for geophysical survey equipment. At least of example embodiments are methods including deploying marine geophysical survey equipment. The deploying may include: installing a disposable antifouling cover of plastic material on a portion of the marine geophysical survey equipment, wherein the disposable antifouling cover occludes a majority of an exterior surface of the portion of the marine geophysical survey equipment; and placing the marine geophysical survey equipment in a body of water.

Claims

1. A method of deploying marine geophysical survey equipment comprising:

obtaining a disposable antifouling cover of plastic material that, prior to installation, defines an outer surface having positive image of a wing of a positioning device and defines an interior surface having a negative image of the wing of the positioning device; and

then

installing the disposable antifouling cover of plastic material on the wing of the positioning device, wherein the disposable antifouling cover occludes the wing of the positioning device; and

placing the marine geophysical survey equipment including the positioning device in a body of water.

2. The method of claim 1 wherein obtaining the disposable antifouling cover further comprises removing the disposable antifouling cover from a stack of disposable antifouling covers where, prior to removal, the disposable antifouling cover is in an abutting relationship with at least one other disposable antifouling cover.

3. A method of deploying marine geophysical survey equipment comprising:

removing a disposable antifouling cover of plastic material from a stack of disposable antifouling covers where prior to removal the disposable antifouling cover is in an abutting relationship with at least one other disposable antifouling cover; and

then

installing the disposable antifouling cover of plastic material on a wing of a positioning device, wherein the disposable antifouling cover occludes the wing of the positioning device; and

placing the marine geophysical survey equipment including the positioning device in a body of water.

4. The method of claim 3 wherein removing the disposable antifouling cover from the stack further comprises removing the disposable antifouling cover from a telescoping relationship with the other disposable antifouling covers.

5. The method of claim 3 wherein installing further comprises at least one selected from the group consisting of:

installing the disposable antifouling cover that is pre-treated with a coating configured to reduce marine growth on an exterior surface of the disposable antifouling cover; and

coating the disposable antifouling cover with a coating configured to reduce marine growth on an exterior surface of the disposable antifouling cover.

6. The method of claim 3 wherein installing the disposable antifouling cover on the wing of the positioning device further comprises latching the disposable antifouling cover in place over the wing by way of a latching feature defined by the disposable antifouling cover.

7. The method of claim 3 wherein installing the disposable antifouling cover on the wing of the positioning device further comprises latching the disposable antifouling cover by way of at least one selected from the group consisting of:

a flange member defined by the disposable antifouling cover;

a protrusion defined on an interior surface of the disposable antifouling cover; and

a ridge defined on an interior surface of the disposable antifouling cover.

8. The method of claim 3 further comprising, between installing the disposable antifouling cover on the wing of the positioning device and placing the marine geophysical survey equipment in the water, deforming at least a portion of the disposable antifouling cover.

9. The method of claim 8 wherein deforming further comprises at least one selected from the group consisting of:

heat shrinking at least a portion of the disposable antifouling cover against the wing of the positioning device;

chemically shrinking at least a portion of the disposable antifouling cover against the wing of the positioning device; and

shrinking at least a portion of the disposable antifouling cover against the wing of the positioning device by application of electromagnetic radiation.

10. The method of claim 3 wherein installing further comprises installing a cover system comprising a first disposable antifouling cover within a second disposable antifouling cover.

11. The method of claim 10 further comprising:

exposing the first disposable antifouling cover to the water; and

then

removing the first disposable antifouling cover from the wing of the positioning device, the removing exposing the second disposable antifouling cover; and

then

exposing the second disposable antifouling cover to the water.

12. The method of claim 3 wherein removing the disposable antifouling cover from the stack further comprises removing the disposable antifouling cover from a telescoping relationship with the other disposable antifouling covers.

13. A method of retrieving marine geophysical survey equipment in the form a sensor streamer comprising a positioning device with a wing, the wing covered by a disposable antifouling cover prior to the retrieving, the method comprising:

extracting the marine geophysical survey equipment from a body of water; and

removing the disposable antifouling cover from the wing of the positioning device,

wherein after being removed the disposable antifouling cover defines an outer surface having a positive image of a wing of a positioning device and defines an interior surface having a negative image of the wing of the positioning device.

14. The method of claim 13 wherein removing the disposable antifouling cover further comprises at least one selected from the group consisting of:

removing the disposable antifouling cover once the portion of the positioning device is on a deck of a vessel performing the retrieving; and

removing the disposable antifouling cover with the positioning device in the water, the removing from a work boat distinct from a vessel onto which the marine geophysical survey equipment is retrieved.

15. The method of claim 14 wherein removing the disposable antifouling cover further comprises removing the disposable antifouling cover to expose an underlying disposable antifouling cover.

16. The method of claim 13 wherein removing the disposable antifouling cover from the wing of the positioning device further comprises at least one selected from the group consisting of:

dislodging a protrusion defined on an interior surface of the disposable antifouling cover from an indention defined on an outer surface of the wing of the positioning device; and

dislodging a ridge defined on an interior surface of the disposable antifouling cover from a valley defined on an outer surface of the wing of the positioning device.