Acid injection
AssigneeGE Oil & Gas UK Limited
InventorsAnthony Jason Vangasse, Gareth Huw Lewis
Life of this patent
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Abstract
A method of applying acid-wash to a subsea connection assembly, in particular a stabplate connection, in order to remove unwanted material such as marine growth and calcareous deposits. The method consists of inserting a plug, containing channels, into a central in a stabplate connection and injecting acid-wash through the plug. The plug may be carried by an operating tool arm of a remotely operated underwater vehicle (ROV).
Claims18
A method of applying acid-wash to a subsea connection system,
- wherein the subsea connection system comprises a removable plate attached by an attachment to a fixed plate to define a central opening, the method comprising:
- inserting a plug, comprising at least one channel and a sealing ring, into the central opening to seal the central opening by the sealing ring, the attachment further defining a cavity with the sealing ring of the plug, such that the cavity, into which the acid-wash is injected, is adjacent to the sealed central opening;
- sealing the cavity;
- and
- subsequently, injecting the acid-wash into the at least one channel.
A method of applying acid-wash to a subsea connection system, wherein the subsea connection system comprises a removable plate attached by an attachment to a fixed plate to define a central opening, the method comprising:
- inserting a plug, comprising at least one channel and a sealing ring, into the central opening to seal the central opening by the sealing ring;
- and
- injecting the acid-wash into the at least one channel, wherein:
- the step of inserting the plug is carried out by a remotely operated underwater vehicle, and
- the attachment with the sealing ring of the plug defines a cavity, such that the cavity, into which the acid-wash is injected, is adjacent to the sealed central opening, wherein a surface of the remotely operated underwater vehicle abuts against the attachment to seal the cavity prior to the step of injecting the acid-wash into the at least one channel.
An apparatus, comprising:
- a subsea connection system comprising a removable plate attached by an attachment to a fixed plate to define a central opening;
- and
- a plug comprising at least one channel into which acid-wash is injected in use and a sealing ring to seal the central opening, a cavity defined by the attachment and the sealing ring of the plug into which the acid-wash can be injected and the cavity is adjacent to the sealed central opening;
- and wherein the cavity is sealed prior to injecting the acid-wash into the at least one channel.
Dependencies are inferred from the claim text.