AN ARRANGEMENT OF AN UNMANNED AND REMOTELY OPERATED PRODUCTION FACILITY

Abstract

An arrangement of an unmanned and remotely operated production facility comprising a wellhead platform including a wellhead assembly (1) having an X-mas tree, a flowline (2) transporting hydrocarbon fluids produced from a well via said wellhead assembly to two or more consecutive process equipment(s) (3-6), and further on to a destination via a transport line (8). Any process equipment and/or pipeline section located at a higher level than said outlet point A from said wellhead assembly (1), is arranged to either drain back to the x-mas tree, or drain downstream to said transport pipeline by assistance of respective valves arranged along said flowline (2).

Claims

1. An arrangement of an unmanned and remotely operated production facility, the arrangement comprising a wellhead platform including a wellhead assembly having a X-mas tree, a flowline starting from an outlet point (A) from the X-mas tree and transporting hydrocarbon fluids produced from a well via the wellhead assembly to one or more consecutive process equipment, and further on to a destination via a transport pipeline starting at a point B located at a level lower than point A, wherein any process equipment and/or pipeline section located at a higher level than the outlet point A from the wellhead assembly, is arranged to either drain back to the X mas tree, or drain downstream to the transport pipeline by assistance of respective valves arranged along the flowline.

2. The arrangement according to claim 1, wherein the process equipment may include components like meters, valves, sensors, manifolds, vessels, mechanical equipment or process assemblies.

3. The arrangement according to claim 1, wherein any process equipment low-level pockets (P) are connected to a lower pipeline segment by use of respective actuatable short circuit valve and associated piping conducting fluids to a lower level.

4. The arrangement according to claim 3, wherein the associated piping and circuit valve are short-circuited either to a pipeline segment arranged upstream or to a downstream.

5. The arrangement according to claim 1, wherein the production facility comprises an optional manifold receiving fluid from one or more additional wells and route to transport pipeline for transport to destination.

6. The arrangement according to claim 1, wherein the destination is a processing facility.

7. The arrangement according to claim 1, wherein the arrangement comprises a service line connected to the flowline for depressurizing the flowline and the process equipment after shutdown of the assembly.

8. The arrangement according to claim 7, wherein the service line is connected to the flowline at the proximity of the outlet point from said wellhead assembly (A).

Description

[0026] Other and further objects, features and advantages will appear from the following description of preferred embodiments of the invention, which is given for the purpose of description, and given in context with the appended drawings where:

[0027] FIG. 1 shows in schematic view a wellhead platform with a wellhead assembly having a x-mas tree and pocketed piping and short-circuiting lines,

[0028] FIG. 2 shows in schematic view a wellhead platform similar to FIG. 1, but omit the pocketed piping and short circuiting lines,

[0029] FIG. 3 shows a schematic view of the well head assembly from FIG. 2 with a service line 9 attached to the wellhead assembly.

[0030] Reference is made to FIG. 1 showing a schematic view of a wellhead platform with a wellhead assembly 1 including an x-mas tree, a flowline 2 in which produced fluids from the well are flowing to any process components such as meters, valves, sensors, manifolds, vessels, mechanical equipment or process assemblies 3 to 6.

[0031] The x-mas tree is a conventional x-mas tree with a wing valve 11 arranged at an outlet point A of the wellhead assembly 1. The process components 3-6 may or may not be located in high points with pocketed piping P as shown in the FIG. 1. The low level pockets P means any pipeline segment arranged between the process equipment 3-6 or within a process equipment 3-6 that are arranged in a level lower than the connecting process equipment and the remaining pipeline segments 2a as illustrated in the FIG. 1. Pockets are short-circuited to downstream pipeline segment 2a by use of automated valve(s) 7. Extracted fluids are produced to the transport pipeline 8. In this way, the drained fluid is from pocketed piping P is drained directly to a lower piping segment 2a. The fluid would otherwise be captured in the pockets with no possibility to drain back to the wellhead assembly 1 or to the transport pipeline 8.

[0032] At least one of the process equipment must be higher than the outlet A and B so that the fluid is allowed to drain back to the wellhead assembly 1 or the transport pipe 8.

[0033] FIG. 2 shows a schematic of a wellhead platform with a wellhead assembly 1 including an x-mas tree, a flowline 2 in which produced fluids from the well are flowing to any process components such as meters, valves, sensors, manifolds, vessels, mechanical equipment or process assemblies 3 to 6. The process components may or may not be located in high points with continuously sloping piping to either side to facilitate accumulation of liquid in the well1 and transport pipeline 8 respectively. The local high point may be any of the installed equipment 3-6. In this embodiment, the fluid in the flowline 2 and process equipment 3-6 follows the flowline to the transport line or back to the wellhead when the arrangement is drained. The flowline do not contain any low level pockets P as in the first embodiment in FIG. 1. As in FIG. 1, at least one of the process equipment must be higher that the outlet A and B so that the fluid is allowed to drain back to the wellhead assembly 1 or the transport pipe 8.

[0034] FIG. 3 shows the well head assembly 1 shown in FIG. 2 with a service line 9 attached to the wellhead assembly 1.

[0035] The service line 9 is well known equipment per se and is for instance disclosed in publication U.S. Pat. No. 6,397,948.

[0036] The service line 9 is arranged so that during a shutdown of the assembly, once the flowline 2 and the process equipment have been drained of liquid, the service line 9 can be used to depressurize the system by providing an outlet for gas.

[0037] This may be achieved by opening a valve 10 on the service line 9. The valve is opened once the system has been drained of liquid. The service line 9 is attached to the wellhead assembly 1 in the proximity of the outlet of the wellhead assembly A as illustrated in the FIG. 3. This is also in the proximity of a wing valve 11 arranged in connection with the wellhead assembly 1.

[0038] The service line 9 can then act as an outlet vent for the pressurized gas in the wellhead assembly 1.

[0039] The opposite end of the service line 3 leads to a system for depressurizing. This could for instance be a facility.

[0040] The service line 9 could also be arranged so that it can be used to provide chemicals to the flowline 2 and process equipment 3-5. The service line 9 may also be arranged so that it can be used to depressurize the flowline 2 and process equipment 3-5 after a shutdown of the assembly 1.

[0041] The service line 9 is illustrated in relation to the embodiment in FIG. 2 but is equally applicable together with the embodiment of FIG. 1.