SU787616A1 - Device for monitoring leaks from annular spaces of sealing units of remotely controlled oil flow apparatus - Google Patents

Description

one

The invention relates to equipment control systems and can be used in oil production, for example, in wells with a subsea wellhead.

Fountain valves, used in the operation of wells with an underwater wellhead, include a control unit and operating units, the sealing connections of which have seals and annular cavities.

A device is known for detecting leaks in sealing joints of the Christmas tree fittings, which contains a hydraulic cylinder, one cavity of which is connected to the annular cavities of the sealing joint, and the other to the internal cavity of the Christmas tree, and the signal device Cl.

The drawback of the device is the lack of information about the intensity of the leaks, which leads to unreasonable well shutdowns and, accordingly, more frequent repairs than necessary.

It is also known a device for monitoring leaks from the annular cavities of the sealing assemblies of remote-controlled fountain valves with

a control unit and a distributor containing a fluid accumulator associated with annular cavities, a counting element and a discharge valve

5 for communication of the battery with discharge line 2.

The complexity of the design of this device is due to the presence of many elements included in it (fluid accumulator, discharge valve, pressure switch, etc.). In addition, the device guarantees normal operation only at certain allowable pressures in the tt5 pipe flow line designed to discharge accumulated leaks. However, the accumulated leaks in the annulus require the removal of it, otherwise an emergency may be caused by filling the annulus of the leak.

This device does not provide reliable operation with an increase in pressure in the annular flow line or, if necessary, the release of accumulated leaks into the working flow line. The purpose of the invention is to improve the reliability of operation when dumping leaks

30 to discharge line.

This goal is achieved by the fact that the battery is made in the form of a multiplier, the low pressure cavity of which is connected to the pressure and drain lines of the control unit through its distributor, and the annular cavities of the sealing assemblies and the discharge valve are connected to the high pressure cavity of the multiplier.

The drawing shows the device. to control leaks.

The annular cavities 1 of the sealing assemblies, which are located in the working blocks of the Christmas tree, are connected by a manifold 2 through a check valve 3 to a cavity 4 of the high pressure of the multiplier 5, which in turn is connected via a check valve 6 to the working flow line 7. The piston 8 of the multiplier 5 is connected with electromagnetically controlled valve 9 using a limit switch 10 located on the power supply line 11 for controlling the valve with electromagnetic control of the fountain control unit fittings communicating cavity 12 depending on the position of the piston 8 of the multiplier 5 with the pressure line 13 and the drain line 14 of the control unit and to ensure that the signal on the presence of limit leaks in the operational through the signaling device 15.

The device works as follows.

In the absence of leaks in the sealing connections, the piston 8 of the multiplier 5 is in extreme. the left position and the associated contact of the limit switch 10 is open. The cavity 12 through the solenoid-controlled distributor 9 communicates with the drain line 14 in the control unit of the Christmas tree. When leaks appear in the annular cavities of the sealing units 1, they through the manifold 2 through the check valve 3 enter the multiplier 5, fill the cavity 4 and move the piston 8 to the right. Increasing leaks leads to the complete filling of the cavity 4 of the multiplier 5, which corresponds to the extreme right position of the piston 8, the contact of the limit switch 10 is closed. When the contact of the limit switch 10 is closed, the current enters the solenoid-controlled valve 9, whereby the drain line 14 overlaps, and the cavity 12 communicates with the pressure line 13 of the control unit and a signal arrives at the control unit 15. The working fluid under pressure enters the cavity 12 of the multiplier 5, moving the piston 8 to the extreme left position, while the leaks collected in the cavity 4 are under pressure, Stranded in the multiplier 5, through the check valve 6 are drained into the working pipeline, and the piston 8 returns to the far left position corresponding to the open contact of the contact switch 10. Subsequently, upon the appearance of leaks, the cycle repeats.

Thus, the proposed device solves the possibility of timely delivery of information about the presence of a limiting number of leaks with the full volume of the multiplier cavity, when filled, the piston is in the extreme right position. The number and frequency of cycles on the diagram of the signaling device can be judged on the intensity of leaks and their change over time.

The proposed device contains

only one structural element multiplicator, and the rest of its elements are already included in the control unit of the Christmas tree, which greatly simplifies the design and provides wide implementation possibilities.

Claims (2)

1. USSR author's certificate number 573571, cl. Е 21 В 33 / 03.03.05.73 ABOUT 2. USSR author's certificate in application 251779, cl. Е 21 В 19/00, 12. 05.77 (prototype). / J  , A- / // /