SU419733A1 - PULSATING FLUID ALARM SIGNALIZER - Google Patents

Description

The proposed pulsating fluid flow detector to provide information about the deviation of fluid flow from the nominal value can be used in those areas of the technology where it is necessary to obtain operational information about the fluid flows, in particular, in the oil industry to issue operational information about the decrease in fluid flow to the wellhead wells.

Fluid flow meters are known to contain a measuring diaphragm and a sensing element connected by impulse tubes to the diaphragm cavities.

The reliability is not sufficient due to the design of the detector and the constant cross section of the diaphragm. The false positives also occur in the case of a pulsating flow.

In order to increase the reliability of the device and to expand the working range S, a pulsed-tube signaling device between the separators and the sensing element chambers is equipped with chokes that smooth the pulsations, and the orifice plate is made with adjustable passages; M section.

The drawing shows the scheme of the proposed detector.

The non-pressure sensor consists of a housing 1 with a sensor element attached to the left of it - a bellows 2. To the bottom of the bellows 2 is attached at one end

the core 3, containing an insert of Armico II iron supported by the other end on the fluoroplastic bearing 4, is fixed in a cylindrical cover 5 of the housing 1 (opposite to the bellows side). The bellows 2 is closed by a lid 6 bolted to the housing 1. A cavity bounded by the housing 1, a bellows 2 and a lid 6. represents the positive sensor chamber, and the cavity bounded by the inner

the surface of the bellows 2 and the cylindrical. case 5, represents the negative sensor chamber. The plus and minus chambers are connected by tubes 7, respectively, with positive and negative dividers. Separators are made the same and each of them is a loose membrane 8 with a rigid center, sandwiched between the top cover 9 and the bottom cover 10, which are bolted. To cover 9 separator

the housing 11 is fastened with a lid 12 attached to it by pins. In the housing 11 there is a choke, which is a tube 13 with an internal small diameter, both ends of which are protected by filters 14 and 15

respectively on covers 12 and 9. All cavities of the sensor are filled with non-freezing intermediate fluid. When filling with liquid, the rigid centers in the loose membranes 8 are in an average neutral position. After the sensor is filled with liquid, the filling openings are closed with plugs 16. Gaskets 17-20 ensure tightness. A differential solenoid type 21 transformer is mounted on the cylindrical case 5 of a non-colored color material. The position of the transformer 21 relative to the core 3 is adjusted by rotating the threaded plug 22 in the threaded part of the bowl 23 attached to the case 1 by studs. The locknut 24 and the spring 25 constantly clamp the transformer 21 to the thread: the plug 22, preventing adjustment failure during stringing and vibration. A cap 26 is attached to the cup 23, having a gland 27 for a four-core cable 28 connecting the transformer 21 to the electronic unit. Gaskets 29, 30 seal joints.

The rings 31 seal the volume of fluid enclosed inside the bellows 2 when overloaded, and thereby protect it from destruction. All critical moving parts of the sensor operate in an antifreeze fluid and are not in contact with the external medium.

The constriction device is a segmented diaphragm with a variable orifice. It is made of two pipes 32 and 33, the flanges of which 34 and 35 are bolted together, and in the assembly state form a groove where the valve 36 is placed with a screw 37 attached to it. The valve 36 is closed from the top by a cover 38, through which the screw 37 passes The sealing is achieved by stuffing the packing 39, its preload is carried out by the nut 40. The bracket 41 containing the nut 42 through which the screw 37 passes is bolted to the lid 38.

Gaskets 43, 44 serve to seal. Turning the nut 42 raises or lowers the screw 37 with the valve 36. The selection of pressures is chamber. The pressure from the converging chambers under the loose diaphragm 8 of the spacers is supplied through pulse tubes 45 and 46 connected to the pressure difference separators using couplings 47. The pulse tubes 45 and 46 communicate with each other by tube 48. Valves 49 and 50 serve to remove the sensor without interrupting the flow of medium through the pipeline. Opening the valve 51, you can communicate between the impulse tubes 45 and 46, which is necessary when setting up. Flanges

52 narrowing device and return flanges

53st daty between bolt joints. Gasket 54 - sealing. The arrow shows the direction of movement of the toe.

The electronic unit of the detector is designed to issue an alarm in case of

changes in well flow rate, as well as when the instrument is overloaded in the event of a restriction device contaminated. The device works as follows.

In the initial state, the valve 36 is raised upward, the points 49, 50, 51 are open, the pressure differential is absent, the bellows 2 is not tightened, the core 3 is in the initial state, its movement. 0 mm, while the voltage removed from the differential transformer 21 is 0.5 volts. To start the device, it is necessary to close the valve 51 and, using valve 36, to create a pressure drop PQ on the narrowed device. Behind

due to the pressure drop in la membrane, the plus separator 8 rises somewhat and displaces a certain amount of intermediate fluid through the throttling tube 13 with filters 14, 15 and through tube 7 under

the sensor cover 6, while the bellows 2 with the core 3 is mixed right to the right

V

where V is the volume of fluid entering under cover 6;

So ,, is the effective area of the bellows 2; l - core stroke 3.

P) and slender pressure 2, the exact same volume of fluid from the sensor's right cavity enters the right minus separator through a throttling tube 13 with filters 4, 15. In la membrane 8 with

this bends down a little. In this construction, the core stroke 3 is equal to L1; 5 mm, corresponds to 100% of the flow of any intensity. The required differential pressure is adjusted by lowering (raising)

gate valves 36 using a nut 42. With a maximum displacement of the core 3 per L); 5 mm, the voltage at the output of the transformer 21 is equal to c. On the pulsating flow pressure drop

varies from O to APR, where APR is the peak value of the pressure differential. The sensor is made nnontsnonym. The inertia is imparted by throttling tubes 13 mounted on each of the spacers. Tube 13

It has an internal diameter of 0.5 mm and a length of 150 mm. The inertia of the system is set such that the sensor completely does not respond to the pulsating nature of the flow, the bellows 2 is displaced only under the action of the average

pressure drop

Only a steady decrease in the flow rate causes a displacement of the sylphol 2 to the left until a new balance of forces is set in; in this case, an emergency signal is sent to the communication line if the new position of the core 3 (bellows 2) corresponds to the percentage of consumption set by the software switch. 13 in case of overloading of the sysyphon 2 at one-sided pressure, for example, when the constriction device closes, the bellows bias