# US 2016/0258653 A1 · Subsea ROV-Mounted Hot Water Injection Skid

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- Number: US 2016/0258653 A1
- Document ID: US20160258653A1
- Status: Published application
- Kind: A1
- Application number: 15/061,698
- Filed: 2016-03-04
- Published: 2016-09-08
- Earliest claimed: 2015-03-06
- Assignees: Oceaneering International, Inc.
- Applicants: Oceaneering International, Inc.
- Inventors: Kosta Papasideris
- Web page: https://patentgrep.com/patent/US20160258653A1

## CPC

- B63J 2/12: Heating; Cooling
- B63G 8/001: {Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations (self-propelled or direction controlled diving chambers with mechanical link to a base B63C11/42)}
- F24H 1/0018: {using electric energy supply}
- B63G 2008/002: {unmanned}
- B63J: AUXILIARIES ON VESSELS
- B63G: OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS (means of attack or defence in general, e.g. turrets F41H)
- F24H: FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL (steam generation F22)

## Abstract

A remotely operated vehicle mountable hot water injection skid comprises skid frame, one or more floats, a power interface, one or more subsea power transformers, one or more electrical power interfaces, one or more data communication interfaces, one or more heater skid telemetry systems, a predetermined set of integration equipment, a water collection and heating container, a pumping and circulation system, and a hot seawater circulation flying lead or spray wand which allows delivery of heated fluid directly to a subsea asset using heated seawater delivered through a common hydraulic hot stab or directly to via a pressurized spraying wand.

## Claims

### Claim 1

A remotely operated vehicle mountable hot water injection skid (1), comprising:
a. a skid frame (10);
b. a float (18) disposed at least partially within the skid frame;
c. a subsea power transformer (30) disposed at least partially within the skid frame;
d. a power interface (11) disposed at least partially within the skid frame (1) and operatively in communication with the subsea power transformer (30);
e. an electrical power interface (60) disposed at least partially within the skid frame, the electrical power interface operatively in communication with the subsea power transformer;
f. a data communication interface (12) disposed at least partially within the skid frame;
g. a heater skid telemetry system (20) disposed at least partially within the skid frame, the heater skid telemetry system operatively in communication with the subsea power transformer and the data communication interface;
h. a predetermined set of integration equipment (25) disposed at least partially within the skid frame, the predetermined set of integration equipment operatively in communication with the subsea power transformer and the heater skid telemetry system (20);
i. a water collection and heating container (40) disposed at least partially within the skid frame, the water collection and heating container (40) comprising:
i. an interior water chamber (43);
ii. a water inlet (41) in fluid communication with the interior water chamber;
iii. a water outlet (42) in fluid communication with the interior water chamber; and
iv. a heating element (70) in fluid communication with the interior water chamber;
j. a pumping and circulation system (50) disposed at least partially within the skid frame, the hydraulically-powered pumping and circulation system (50) in fluid communication with the water collection and heating container (40), the pumping and circulation system (50) operatively in communication with the subsea power transformer and the heater skid telemetry system (20).

### Claim 2 (depends on 1)

The remotely operated vehicle mountable hot water injection skid of claim 1, wherein the data communication port is operatively connected to the predetermined set of integration equipment.

### Claim 3 (depends on 1)

The remotely operated vehicle mountable hot water injection skid of claim 1, wherein the skid frame comprises aluminum.

### Claim 4 (depends on 1)

The remotely operated vehicle mountable hot water injection skid of claim 1, wherein the predetermined set of integration equipment (25) comprises hydraulic and electrical WROV-to-Skid integration equipment.

### Claim 5 (depends on 1)

The remotely operated vehicle mountable hot water injection skid of claim 1, wherein the subsea power transformer (30) comprises a high power subsea power transformer.

### Claim 6 (depends on 1)

The remotely operated vehicle mountable hot water injection skid of claim 1, wherein the heating element (70) comprises a high power immersion-style heating element.

### Claim 7 (depends on 1)

The remotely operated vehicle mountable hot water injection skid of claim 1, wherein the pumping and circulation system (50) comprises a hydraulically-powered pumping and circulation system (50).

### Claim 8

A subsea heating fluid system (2), comprising:
a. a remotely operated vehicle mountable hot water injection skid (1), comprising:
i. a skid frame (10);
ii. a power interface (11) disposed at least partially within the skid frame;
iii. a power transformer (30) disposed at least partially within the skid frame, the power transformer operatively in communication with the power interface;
iv. a data communication interface (12) disposed at least partially within the skid frame;
v. a heater skid telemetry system (20) disposed at least partially within the skid frame, the heater skid telemetry system operatively in communication with the power transformer and the data communication interface;
vi. a heating system (40), comprising:
1. a water collection and heating void container (40), comprising an interior chamber (43);
2. a heating element (70) disposed at least partially within the water collection and heating void container;
3. a fluid inlet (41) in fluid communication with the water collection and heating void container; and
4. a fluid outlet (42) in fluid communication with the water collection and heating void container;
vii. a sensor (22) disposed at least partially within the skid frame and operatively in communication with the heating system and the heater skid telemetry system;
viii. a pumping and circulation system (50) in fluid communication with the heating system fluid inlet (41), the pumping and circulation system comprising a pump inlet (51) and a pump outlet (52);
ix. a first valve (13) in fluid communication with the pumping and circulation system (50) and the fluid delivery wand (80); and
x. a fluid delivery conduit (80) in fluid communication with the first valve; and
b. a topside control and monitoring system (90) operatively in communication with the predetermined set of integration equipment via the data communication port (12).

### Claim 9 (depends on 8)

The heating system of claim 8, wherein the heating element (70) comprises a high power immersion-style heating element.

### Claim 10 (depends on 8)

The heating system of claim 8, wherein the power transformer (30) comprises a high power subsea transformer.

### Claim 11 (depends on 10)

The heating system of claim 10, wherein the high power subsea transformer comprises a 3000 VAC high power subsea transformer.

### Claim 12 (depends on 8)

The heating system of claim 8, wherein the pumping and circulation system (50) further comprises a hydraulically-powered pumping and circulation system (50).

### Claim 13 (depends on 8)

The heating system of claim 8, further comprising a predetermined set of integration equipment (25) disposed at least partially within the skid frame.

### Claim 14 (depends on 8)

The heating system of claim 8, wherein the fluid delivery conduit (80) comprises at least one of a hot seawater circulation flying lead (82) or a spray wand (81).

### Claim 15 (depends on 8)

The heating system of claim 8, wherein the first valve (13) comprises a three way valve, the three way valve comprising:
a. a first inlet (13a) in fluid communication with an outside environment;
b. a first outlet (13b) in fluid communication with the heating system fluid outlet (42) and with the first inlet; and
c. a second outlet (13c) in fluid communication with the fluid delivery system (80) and the first inlet.

### Claim 16 (depends on 8)

The heating system of claim 8, further comprising a set of sensors (22) operatively in communication with the heater skid telemetry system (20), the set of sensors comprising:
a. a pump inlet fluid sensor (23) operatively in communication with the pump inlet (51);
b. a pump outlet fluid sensor (24) operatively in communication with the pump outlet (52);
c. an outlet flow sensor (25) operatively in communication with the heating system fluid outlet (42);
d. an outlet data sensor (26) operatively in communication with the heating system fluid outlet (42); and
e. a power sensor (27) operatively in communication with the power transformer (30).

### Claim 17 (depends on 16)

The heating system of claim 16, wherein:
a. the pump inlet fluid sensor (23) comprises a pressure-flow sensor;
b. a pump outlet fluid sensor (24) comprises a pressure-flow sensor;
c. the outlet data sensor (26) comprises a pressure-flow-temperature sensor; and
d. the power sensor (27) comprises a voltage and/or current sensor.

### Claim 18

A method of applying a heated fluid to a subsea asset via heated seawater equipment through a common interface style and not just on the exterior of the asset, comprising:
a. integrating a hot water injection skid (1) directly with a host Remotely Operated Vehicle (ROV) by deploying the hot water injection skid (1) under a belly of the host ROV (100), the hot water injection skid (1) comprising
i. a skid frame (10);
ii. a float (18) disposed at least partially within the skid frame;
iii. a subsea power transformer (30) disposed at least partially within the skid frame;
iv. a power interface (11) disposed at least partially within the skid frame (1) and operatively in communication with the subsea power transformer (30);
v. an electrical power interface (60) disposed at least partially within the skid frame, the electrical power interface operatively in communication with the subsea power transformer;
vi. a data communication interface (12) disposed at least partially within the skid frame;
vii. a heater skid telemetry system (20) disposed at least partially within the skid frame, the heater skid telemetry system operatively in communication with the subsea power transformer and the data communication interface;
viii. a predetermined set of integration equipment (25) disposed at least partially within the skid frame, the predetermined set of integration equipment operatively in communication with the subsea power transformer and the heater skid telemetry system (20);
ix. a water collection and heating container (40) disposed at least partially within the skid frame, the water collection and heating container (40) comprising:
1. an interior water chamber (43);
2. a water inlet (41) in fluid communication with the interior water chamber;
3. a water outlet (42) in fluid communication with the interior water chamber; and
4. a heating element (70) in fluid communication with the interior water chamber;
x. a pumping and circulation system (50) disposed at least partially within the skid frame, the hydraulically-powered pumping and circulation system (50) in fluid communication with the water collection and heating container (40), the pumping and circulation system (50) operatively in communication with the subsea power transformer and the heater skid telemetry system (20); and
b. directly integrating the hot water injection skid (1) into an electrical and hydraulic system of the host ROV (100);
c. operatively placing a fluid delivery conduit (80) in fluid communication with the water collection and heating container (40) water outlet;
d. operatively placing a first valve (13) in fluid communication with the pumping and circulation system (50) and the fluid delivery conduit;
e. once integrated, allowing the hot water injection skid (1) to utilize available electrical and hydraulic power from the host ROV (100) to complete a predetermined set of tasks, the utilization comprising:
i. using the hot water injection skid to pump ambient seawater—via a circulation pump—into the interior water chamber of the heating chamber;
ii. heating the seawater is heated inside the heating chamber;
iii. as the seawater is heated inside the heating chamber, collecting real-time environmental data;
iv. transmitting the real-time environmental data to a topside system for display to a user via topside control software;
v.

### Claim 19 (depends on 18)

The method of applying a heated fluid to a subsea asset via heated seawater equipment through a common interface style and not just on the exterior of the asset of claim 18, further comprising instructing the host ROV, based on the real-time environmental data, to either stab an output flow hot stab of the fluid delivery conduit into a pre-existing subsea equipment hot stab receptor or spray pressurized heated seawater at a frozen asset from a fluid delivery conduit spray wand.

### Claim 20 (depends on 18)

The method of applying a heated fluid to a subsea asset via heated seawater equipment through a common interface style and not just on the exterior of the asset of claim 18, further comprising closing the first valve to allow colder seawater suction to be removed from the circuit and to allow only hot water from the heating system to flow out through or onto the subsea asset.