Installation for the separation of underground of the effluents of producing of a marine oil field.

The present invention relates to an installation for the separation of bottom of efficient wells producers marine oil field.

The effluents from the producing wells of an oil field are mixtures di or tciphasic gas, water and liquids of hydcocacbures. Before routing these effluents on the premises with refinery and consoiraaation, that require them dëgazec and lowering its maximum water content to obtain a liquid hydrocarbon phase, having vapor is compatible with the transportation pipes and takers, and the water contents and gas meets certain nuns the users, particularly refineries.

This separation of gas and water contained in said waste stream is typically performed in separators, which are tanks operating at constant pressure through a valve system with adjustable aperture on outputs of hydrocarbon liquid, gas and optionally water. By a baffle system properly disposed within the separator, the flow of the multiphase mixture to be treated is delayed so as to avoid entrainment of droplets confectioneries liquid? in cases. and bubbling - this is AZ in the liquid phase, can be used a single separator if batteries of separators connected in series, each being set to a predetermined pressure which may be equal or not equal to atmospheric pressure.

For producing a marine oil field is removable in some cases, especially when the field is remote from the coast, confectioneries separation operations offshore.

For this purpose, it has been proposed to install the separators on a platform emerging fixed anchored in the vicinity of the producing wells, said separators being connected by a collection beam to different. wellheads placed on the sea bed. This solution does not offer but an interest limited by the extent of the structures GUI are required to perform such a collection center aerial view of the screen inportant swells that constitutes a collection beam going back along the platform.

It is envisioned that also type separate background

using an installation submerged without overhead support, said physico- background subsea adjacent a series of production wells. This equipment is hard to access toto lorsqir ' intervention is required and in between it mango of fiabilit - ^.

The present invention relates to an installation for the separation of bottom which overcomes the shortcomings aforementioned installations.

installation according to the invention for separating the bottom of well producers edrluents R. D. marine oil field is characterized in that it comprises a base 3 - improved aerobatic negative anchored 3ur the seabed near the subsea production wells, a seal box integral with said base plate and provided with at least one gas-liquid separator, said separator being connected through pipes 3 * each of said subsea wells and being further provided with a conduit connected to a torch for exhausting gas released I-the atmosphere and a conduit for drawing off the degassed liquid phase, the portion of each of said conduits connected to the separator 3 located inside the shell, a standpipe to the positive flottabilitS surmounting the casing and having a projecting portion for supporting a platform, communicmant inside said column. in leaktight manner with the interior of said box and thereby communicate the platform and the casing, and means disposed in the casing and having valves mounted on the interior portions of the casing gas waste pipe and withdrawal of the liquid phase for setting the flow rate in each of said conduits and flUiàeaiesi control the operation of the separator. In a MB - ^ e of embodiment 1 'plant according to the invention the casing is fixed directly on the header, the tubular string being' are violated-th to the caisson through a joint giving two^Jegrés of freedom.

According to another embodiment of the invention the installation selcn box is connected the L the base by means of a joint providing two degrees * th freedom, the tubular string being fixed rigidly to the box

In a preferred embodiment of 1 'plant according to the invention, the separator is divia' into two compartments communicate by their inner part, one of the compartments of low volume being used for gauging and the antrum for the production, said compartments' fed as I - narall * '!? and as each provided with a discharge conduit Ga " connected^has the torch, the withdrawal of the liquid phase!' 3 being carried out gassed

:. · has: '<■;■' a. conduit placed -, the. bottom of the conoartimeru:

:: ΐ ulu large volume.

In another preferred embodiment " the separators operate 1 substantially atmospheric pressure.

The box should have a volume large enough to allow for the installation key equipment for producing wells, control and monitoring of the one or more separators, and d * lëgazès discharge liquid hydrocarbons to storage. Can be used including a cylindrical casing having an annular splitter. In this case the conduits bringing the production⁴ in ES well at separator must pass through said separator or the bottom of the housing. Another alternative is to use a parallelepipedal box comprising two separators arranged cylindrical respectively on each the two parallel side faces of said box. The passages of the c: rr.cu: ITS1 D.¹ supplying the production wells to the separators can then be distributed on both side faces of the box not wearing the separator.

In such cases the vessel may be placed under the upper press assembly ion or the I the atmospheric pressure.

The box is supplied with electrical energy by cables

-■line poles down from the platform, or oncoming fonu of sea from a distribution center. It also comprises, a ventilation system consisting, for example, by falling leux ducts of the platform along the tubular column, one, for supplying fresh air to the casing and, the other for outflow of 1' foul air.

The invention will be better 'included'. reading of the following description of one of its embodiments given! not exclusively by referring to Figures - in the appendix.

Figure 1 schematically shows a plant for separating bottom according to the invention, while Figures 1 a and 1 b are sections of Figure 1 along respectively the lines a-a and b-T-.

Figure 2 gives a. schematic representation of devices placed in the box and Peppers therefor to the separator.

Figure 3 is a section of another embodiment of the box and associated separators.

Referring to Figures 1, 1 a and 1 b., found in 1 a base confectioneries strongly negative buoyancy, in particular a base concrete, resting on the SOI submarine? 1 and anchored thereto by 'the inter -: permissible ·' a pile zu: ' iaire worksheet for sudoku type. said base. Tl of "CD - IERs evident that any other hub D. · anchor 1' ^ *" of Ba^C. in subsystem has at * lo :. - Mars in-can be used, a joint 4 giving two degrees of freedom makes integral with the base of a box 1^{the R} 5 with the I 'a pedestal' exa-V - 6 * because a cement slab played :! the role of τ ℮ 8. mounted cage and oermettant efforts are applied - " joint. The box is a separator surrounding region *** annular atmospheric divided into a compartment D.<, producing.

high volume compartment and a yellow AGEs 7f low 10" olume. The separator is supplied by a manifold P-placed~, 1 ' bottom of the box and connected through pipes 9 to the DJ^C. ? érent■producing wells not shown, said conduits 9 supported on the base 1 and entering the box by the URs. central passageway in the joint and the base of the box. A floor 19, 19 provided with a central passage dividing the casing into UER>' tagas. A tubular column 11 is emerging - ^ - 1 χ ℮ rigidly; T the so constructing them to said box, said column being provided with " notteurr 12 embedded in a wire mesh 1' surrounding ladit - column. The part of the column above the 'e on'? ra the RC. lg 29 m to sea, is surmounted by a platform 19 starting motor comprising^{the n} oror.t erffective powerU - ". except anuter. 16 and a bridge for helicopter 1". " iNH-to-laugh - the column '1 communicates with 1' - within the box, the YES offer - LIU - f-cyle.

•' access to the box from the platform or the flat * -: - - - * eplerenone ℮ρ,:

the box. A torch 1 - connected ' aces each compartment - 9^I the EV 2^I 5 of the separator 1, puts the compartments in communication, T-OCR the atmosphere to provide for removal of modified release because the R *' - LORs^-'e separation, said torch going back. along the column and 'o' as¹ixf? 3 the. platform 15 by an element M talliguethe RR^WITH the Gi ' w 19.

two ventilation ducts 20et 21' ascending depux -. the olateu^F. i>issuance to the box, I provide respectively CA ^ 5' box to said fresh air and exhaust stale air. " nsraie is supplied electric from the platform in transformer * in the casing, via ' V-n-cable * 1 - - narrow 2-downward also along the column. said column moves

35 be also provided with a system " for Ags bateer '.

referring 5 Figure 2, pro 'concept' AE night arriving to the manifold s by the conduits, the PR ^ as TR? the P-CA a duct 2.1 in the plasma producing chamber 25? the n o T by a conduit 28 hacker in the compartment 26 - gauge Iu 'i; vparator.

The torch 18 is connected by a conduit 2 '-' the advantage - 40 upper

d." compartment 2' and the R by a conduit 10, the upper portion of the cempartiKsent 26. A regulator 31 operating on a valve 32 mounted on the duct 30 allows for control of the pressure in the compartments of the separator. 33 And 34 counters respeetivement placed on the conduits 29 and 30 for determining the volume of gas discharged from the torch 1s. The liquid hydrocarbons are removed from the compartment dégazôs 25 of the separator ^{the n} by a conduit 35 connects 3s s is a group of pumps, the pumps' that displaces the liquid hydrocarbons via pipe 37 toward a center floating storage not shown. A level controller 38 operating on a valve 39 mounted on the pipe 37 serves to maintain a constant level of liquid in the compartment 25 of the separator 1 * A conduit 40 on which is mounted a counter 41 and a water content indicator 42 connects the lower part of the cornpartissent 29 to the bottom of the compartment 25 thereby allowing the tapping duct 35 liquid hydrocarbons which are degassed in the compartment of the separator 2f ".

Other equipment not shown can still find their place in the box. Thus, when the production wells underwater items to be ' TREs equipped with pumps forr, the associated energy, be it electrical (electro-pompesi or hydraulic {hycütoêjecteurs for example), can be dispensed from the box "

May be provided also in the box a filtration station sea water injection and filtered water in the wells injectors of the oilfield.

In Figure 3, there is shown diagrammatically at bottom view a section of a parallelepipedal box 50 associated with two cylindrical separators 51, and⁵ a tubular string 52.

On two parallel side faces^has the box 50 exits the separators attached cylindrical 51 each divided into a plasma producing chamber 53 and a gauging compartment 54" each separator 51 is fed by a manifold not shown placed in the box, said manifold receiving the production wells producers underwater conduits 53 through one of the side faces of the box 50 not bearing separator, equipment placed in the box 50 and associated 3 each. cylindrical separators 51, respectively for the supply of production compartimerfcs -53 gauging and 54 of said separator, for the evacuated * felon gas of said compartments and for the drawdown hydro * carbide? liquid released from the compartment 52, are similar cure disclosed for the annular splitter schematism and Figure 2.

!, with placement of the separation plant background

5 can be performed using a technique analocru: ^ than enoloyre Nur placing hinged structures oour drilling under husband nsec.

Initially the base panels, prepared earth and having year system¹ attachment of the joint, the Û is fed

10 vertical area for its ancrarre by an appropriate system the floats. It is then immersed, and then ANC in-'e ground underwater especially using the method of the pile Thor' ", or any other suitable method known in the art.

In a second step, the structure formed by 1' 1 assembly^I box-separator comprising the joint and sumont * the emerging column is brought to the site by flotation NC horizontal position, using, for example because, the floats which is provided with " the column, and optionally a auvi.liai.rs system of fotteurs. Has the desired location is swung around said structure

20 by ballasting floats of the colonnei then the c ^ - REF structure on the location of the header and decreases the * lothabilite has the structure to ensure its immersion.

at the end of-the immersion, the joint is 1 ο - · γ in the attachment system provided on the base, e.ans legtv 1 it is 2f locked.

For a more detailed description of the immersion of the base and of the structure equipped with 1' articulation on the base anchored to the seabed, it is possible, see for example, to Patent French R -⁶ ' 0, 34 11 Ξ the laid the

3 - 1 september 1970 on behalf of the applicant, and nlus particularly, 5 the description referring=>XU fruity 2 ' - the T 3 - e said

■' - - endplate,