Manifold and fluid flow control

1. A valve block body for determining fluid flow direction at a subsea structure, comprising:

a first fluid inlet and a further fluid inlet at opposed sides of the valve block body; wherein the valve block body is rigid and unitary;

a first fluid outlet of the valve block body and a further fluid outlet of the valve block body disposed in a spaced apart relationship;

a first V-shaped fluid communication passageway that comprises two passageway portions each extending within the valve block body from a first common root region proximate to the first fluid inlet;

a further V-shaped fluid communication passageway that comprises two further passageway portions each extending within the valve block body away from a further common root region proximate to the further fluid port; and

a respective selection valve chamber, in a fluid flow path in each passageway portion, for a respective flow selection valve;

wherein an end region of each passageway portion of the first V-shaped fluid communication passageway meets an end region of a respective passageway portion of the further V-shaped fluid communication passageway proximate to a respective fluid outlet.

2. The valve block body as claimed in claim 1 , further comprising:

a still further fluid outlet in a base region of the valve block body.

3. The valve block body as claimed in claim 1 , further comprising:

the valve block body comprises at least one arm region, that each extend from a side of the valve block body, and that comprises an inlet passageway portion that extends through the arm region from an opening orifice on the respective side.

4. The valve block body as claimed in claim 3 , further comprising:

a respective isolation valve chamber, in a fluid flow path in each inlet passageway portion in each arm region, for a respective well isolation valve.

5. The valve block body as claimed in claim 3 , further comprising:

a first intervention port and a further intervention port each extending from a respective opening orifice in an outer surface of the valve block body to a respective inlet passageway portion of a respective arm region via an intervention valve chamber, for a respective intervention valve.

6. The valve block body as claimed in claim 1 , further comprising:

the valve block body comprises at least one opening orifice on each respective side of the valve block body, each opening orifice comprising a respective fluid inlet of the valve block body, and a plurality of securing elements on the side around the opening orifice for securing to a respective inlet connection block that comprises an inlet passageway portion.

7. The valve block body as claimed in claim 6 , further comprising:

a respective isolation valve chamber, in a fluid flow path in each inlet passageway portion in each inlet connection block, for a respective well isolation valve.

8. The valve block body as claimed in claim 1 , further comprising:

the end regions of each passageway portion meet and open into corresponding end regions of other passageway portions at an exit chamber region in the valve block body and each exit chamber region is proximate to a respective fluid outlet.

9. The valve block body as claimed in claim 1 , further comprising:

the valve block body comprises two fluid inlets and two fluid outlets.

10. The valve block body as claimed in claim 1 , further comprising:

the valve block body comprises four fluid inlets and three fluid outlets including one outlet disposed in a centre region of a base of the valve block body.

11. The valve block body as claimed in claim 1 , further comprising:

the valve block body comprises six fluid inlets and four fluid outlets including two fluid outlets disposed at respective off-centre locations in a base region of the valve block body.

12. The valve block body as claimed in claim 1 wherein the valve block body is a forged metallic body and any bend in each flow path through the body is more than 120.degree. and less than 170.degree. inclined with respect to an incoming fluid flow path axis.

13. A subsea structure for connecting a plurality of inlet fluid flow lines to at least one outlet fluid flow line, comprising:

the valve block body as claimed in claim 1 ;

a plurality of flow selection valves each at least partially located in a respective selection valve chamber of the valve block body; and

a plurality of well isolation valves each at least partially in a respective isolation chamber of the valve block body.

14. The subsea structure as claimed in claim 13 , further comprising:

a plurality of inlet connection blocks secured over respective fluid inlets of the valve block body, each comprising a respective isolation valve chamber, and an isolation valve at least partially in an isolation valve chamber.

15. The subsea structure as claimed in claim 13 wherein the subsea structure is a subsea manifold.

16. The subsea structure as claimed in claim 13 , further comprising:

a plurality of headers external to the valve block body and in selective fluid communication with the first and further fluid outlets.

17. A method for determining fluid flow direction at a subsea structure, comprising the steps of:

providing an incoming flow of fluid to at least one fluid inlet of a plurality of fluid inlets of a unitary valve block body; and

selecting a state of an isolation valve in a flow path of each of two respective passageway portions of at least one V-shaped fluid communication passageway of at least two V-shaped fluid communication passageways in the valve block body;

thereby directing the incoming flow of fluid from the at least one fluid inlet to a selected one of at least two fluid outlets of the valve block body.

18. The method as claimed in claim 17 , further comprising:

simultaneously providing an incoming flow of fluid at a plurality of the fluid inlets; and

via a selected state of the isolation valves in the V-shaped fluid communication passageways, routing the incoming flow along a plurality of passageway portions to a common outlet thereby mingling fluid from a plurality of sources or to separate fluid outlets thereby keeping fluid from a plurality of sources separate as the fluid flows through the valve block body.

19. The method as claimed in claim 17 , further comprising:

providing fluid to a plurality of headers that are external to the valve block body by routing fluid from flow lines to the headers via at least one valve block body.