阅读说明：本技术 油管悬挂器安装工具 (Oil pipe hanger mounting tool ) 是由 M·阿加 于 2018-06-29 设计创作，主要内容包括：一种用于液压控制水下装置的系统,该系统包括设置在井系统的腔体内的补偿器、处于所述补偿器和所述水下装置之间的液压连接、被布置成调节提供至所述水下装置的液压压力的压力调节器以及用于释放所述水下装置处的压力的通气工具。(A system for hydraulically controlling a subsea device, the system comprising a compensator disposed within a cavity of a well system, a hydraulic connection between the compensator and the subsea device, a pressure regulator arranged to regulate hydraulic pressure provided to the subsea device, and a venting means for releasing pressure at the subsea device.)

1. A system for hydraulically controlling subsea devices, the system comprising:

a compensator disposed within a cavity of the well system,

a hydraulic connection between the compensator and the subsea installation,

a pressure regulator arranged to regulate hydraulic pressure provided to the subsea device,

venting means for releasing pressure at the subsea device.

2. The system of claim 1, further comprising a second pressure regulator for controlling pressure in the cavity.

3. The system of claim 1 or 2, wherein the cavity is disposed within a blowout preventer.

4. The system of claim 1 or 2, wherein the cavity is disposed within an annular space above a blowout preventer.

5. The system of claim 2, wherein the second pressure regulator is disposed below a choke line.

6. The system of any one of the preceding claims, wherein the compensator is a bladder or a piston.

7. The system of any one of the preceding claims, wherein the subsea device is a tubing hanger running tool or tubing hanger.

8. The system of any one of the preceding claims, further comprising a flow meter for determining the amount of fluid that has flowed to the subsea device.

9. The system of any one of the preceding claims, wherein the subsea device is a wellhead cleaning tool.

10. The system of any one of the preceding claims, wherein the cavity is an annular space above a tubing hanger.

11. The system of any one of the preceding claims, wherein the cavity is disposed below an upper annular valve.

12. A method of hydraulically controlling a subsea device, the method comprising:

a compensator is arranged in a cavity of the well system,

a hydraulic connection is provided between the compensator and the subsea installation,

controlling the pressure within the chamber in such a manner that,

adjusting hydraulic pressure from the compensator to the subsea installation.

13. The method of claim 12, wherein the cavity is disposed within a blowout preventer.

14. The method of claim 12 or 13, wherein controlling the pressure within the cavity comprises closing a valve.

15. The method of claims 12 to 14, wherein adjusting the hydraulic pressure from the compensator to the subsea device comprises: controlling pressure towards a plurality of outlets of the subsea device, and wherein each of the plurality of outlets controls a function of the subsea device.

16. The method of any one of claims 12 to 15, further comprising measuring an amount of fluid flowing to the subsea device.

Technical Field

The present invention relates to a method of subsea well intervention, and in particular to the installation of a tubing hanger tool and the operation of a tubing hanger installation tool.

Background

Controlling subsea tools at the wellhead is challenging due to the distance from the vessel or platform at the sea surface. The umbilical may be used to transmit power and control signals from the surface to the wellhead. One example of a subsea tool is a tubing hanger running tool. The tubing hanger is a support device for the production tubing or casing and is placed in the production tree, the dedicated tubing spool or the wellhead. The tubing hanger may also have openings for hydraulic or electronic control lines or chemical injection lines. The tubing hanger may also provide a seal for the annulus and production area below the hanger. The tubing hanger running tool is used to install the tubing hanger and is operated by hydraulic power. Traditionally, hydraulic power is contained in an umbilical that extends from a vessel or platform at the sea surface to the tubing hanger running tool.

Disclosure of Invention

According to a first aspect of the present invention there is provided a system for hydraulically controlling a subsea (subsea) device, the system comprising a compensator arranged within a cavity of a well system, a hydraulic connection between the compensator and the subsea device, a pressure regulator arranged to regulate hydraulic pressure provided to the subsea device, and a venting means for releasing pressure at the subsea device.

The system may further comprise a second pressure regulator for controlling the pressure in the cavity, and optionally the pressure regulator may be arranged below the throttle (choke) line. The cavity may be provided in the blowout preventer or in the annular space above the tubing hanger. The cavity may be disposed below the upper annular valve.

The compensator may be a bladder or a piston. The subsea device is a tubing hanger running tool or tubing hanger. Alternatively, the subsea device may be a wellhead cleaning tool.

The system may further comprise a flow meter for determining the amount of fluid that has flowed to the subsea device.

According to a second aspect of the invention there is provided a method of hydraulically controlling a subsea device, the method comprising providing a compensator in a cavity of a well system, providing a hydraulic connection between the compensator and the subsea device, controlling the pressure in the cavity and regulating the hydraulic pressure provided from the compensator to the subsea device.

The cavity may be disposed within a blowout preventer. Controlling the pressure within the cavity may include closing a valve. Adjusting the hydraulic pressure provided from the compensator to the subsea device may comprise controlling the pressure provided to a plurality of outlets towards the subsea device, and each of the plurality of outlets may control a function of the subsea device. The method may further comprise measuring the amount of fluid flowing to the subsea device.

Drawings

Some embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

FIG. 1 illustrates a wellhead system including a hydraulic control system;

FIG. 2 illustrates a hydraulic control system;

FIG. 3 shows the hydraulic control system in more detail; and

fig. 4 is a flow chart of a method.

Detailed Description

The inventors have recognized the need to supply hydraulic power locally at the wellhead, particularly for tubing hanger running tool applications. A cavity in the wellhead system may be used to build pressure. For example, the annular spaces in the cavity or tubular above the wellhead in a blowout preventer or christmas tree may be isolated from their respective outlets so that pressure cannot build up as fluid enters the cavity and leaves the cavity. A compensator is disposed within the cavity and connected to the hydraulic line such that a pressure differential between the cavity and the hydraulic fluid within the compensator and the hydraulic line is fixed, and in particular examples, is near zero or zero. Examples of compensators are bladders or pistons made of a suitable flexible material.

The pressurized hydraulic line is connected to a regulator prior to coupling to the tool to drive the tool in operation. The hydraulic control system for driving the operation of the tool further comprises venting means for releasing the hydraulic pressure at the tool. The venting means is provided in an area that is lower than the hydraulic pressure of the system (e.g., an area above an annulus of a blowout preventer) so that the pressure can be released.

Further, a flow meter may be provided before the running tool. The flow meter will indicate how much fluid has flowed through the hydraulic line to the running tool, and the operator or control system can determine from this data how far the moving part of the running tool has traveled due to the hydraulic flow.

Using the cavity of a blowout preventer (BOP) to provide pressurized fluid instead of a Hydraulic Pressure Unit (HPU) on a surface rig and an umbilical reduces complexity and cost. Rather than bringing hydraulic pressure from the surface down to the wellhead, the present system is based on using a BOP to generate the pressure. Furthermore, water depth does not have a direct effect on the way the system works, as hydraulic pressure is determined only by BOP cavity pressure.

Communication with the hydraulic pressure system may be through the BOP or through the communication cable of the drill floor.

One particular embodiment is shown in fig. 1. There is shown a BOP 11, which comprises several standard sealing elements, namely: a totally enclosed shear ram (BSR), a Casing Shear Ram (CSR), an Upper Pipe Ram (UPR), a Middle Pipe Ram (MPR), and a Lower Pipe Ram (LPR). A choke line (12) and kill line (13) are also shown.

Within a cavity is provided a bladder 13 which acts as a compensator for the drive running tool. The bladder is disposed in the cavity between the MPR and the annulus (annular portion), but other cavities may be used.

The hydraulic pressure system is shown in fig. 2, where the rest of the BOP is omitted for clarity. There is shown a sachet 21 identical to sachet 13 of figure 1. The bladder is connected to a control unit 23 by a hydraulic line 22. The control unit 23 has several hydraulic outlets 24 towards the running tool in order to control the different functions of the running tool. When intervention is required, the device may optionally be accessed using a Remotely Operated Vehicle (ROV) through a suitable connection. However, instead of or in addition to an ROV, a communication cable extending from the surface towards the control unit may also be used. The communication cable may extend through a smooth (cut-away) portion of the upper ring member. The hydraulic release line 25 extends upwardly towards the venting means 26. In this example, the venting tool is disposed above an annulus of the BOP.

Fig. 3 shows more details of the control unit of the hydraulic control device. As shown in fig. 2, a bladder 21 and a hydraulic release line 25 are provided. The controller 23 is used to distribute and control the hydraulic pressure outlet towards the running tool. The output is controlled by a hydraulic control valve 30. The output of the illustrated embodiment is connected to a feed tool to perform the following functions: running tool latch (31), running tool unlock (32), tubing hanger unlock (33), tubing hanger lock (34) and tubing hanger verification (35). In addition, a Programmable Logic Controller (PLC) and/or a battery (36) are provided. A flow meter 37 is provided which can be used to determine the distance traveled by the tubing hanger component or tubing hanger running tool. The signal may be provided from the surface to the control unit by a control cable, or alternatively the control unit may be instructed using an ROV.

The hydraulic outputs of the hydraulic pressure systems shown in fig. 1-3 may be used for any associated device that operates based on hydraulic pressure. Other examples are as follows. A hydraulic wellhead cleaning tool may be used to clean wellhead sealing surfaces. The hydraulically activated tool for the BOP itself may be based on this hydraulic pressure system, but it should be noted that in the configuration of fig. 1, if one shear ram is activated, the pressure in the cavity shown will drop.

In fig. 4, a method is shown, which comprises the following steps: providing a compensator in the cavity (S1), providing a hydraulic connection between the compensator and the subsea (subsea) device (S2), controlling the pressure in the cavity (S3), and regulating the hydraulic pressure provided to (relative to) the subsea device (S4).

While the present invention has been described in terms of the preferred embodiments described above, it should be understood that these embodiments are illustrative only, and the claims are not limited to those embodiments. Those skilled in the art will be able to make modifications and alternatives in light of this disclosure which are to be considered as falling within the scope of the appended claims. Each feature disclosed or illustrated in this specification may be incorporated in the invention, alone or in any suitable combination with any other feature disclosed or illustrated herein.