SU1756664A1 - Method and stand for testing leak detectors of hydropneumatic pipe lines - Google Patents

Abstract

Use: Testing pipeline repair devices for transporting oil, gas, chemicals and other products. SUMMARY OF THE INVENTION: When applying an overpressure, successively create an initial pressure Pk within the power of the gas source and increase the level of the operating pressure in the loading system by increasing the pressure of the hydraulic system to P values, taking into account the solubility of the gas in the fluid P-Pk / {VT - V ,, + (Н - h) / H Vs (1 + oPK)}. where fr. VH, VT - the volume of the filler tank, solid filler and the test section of the pipe; H, h - the height of the filling tank and the level of liquid in it; a - coefficient, nt solubility of gas in a liquid. 2 sec. , Zil.

Description

The invention relates to the oil and gas industry, in particular, to the technique of testing devices for the repair of pipelines for transporting oil, gas, chemicals and other products.

A device for eliminating leaks, containing two half-shears and an injection mechanism in the form of a cylinder cavity with a chamber filled with glue, is known for squeezing a portion of glue into the defective opening of the pipeline in order to seal it,

The indicated device is to be studied for the purpose of determining its mode of operation for various media (liquid, gaseous, gas-liquid), pressures and productivity. It is not possible to make the indicated on the production pipeline. This requires preliminary testing of the device in the laboratory at the stand.

A stand consisting of a multiplicator, a filling limiter, spools, a hydraulic drive, a tank, and instrumentation equipment is known, and is designed to crimp deep well sucker-rod pumps placed on a truss arm, driven in motion. hydraulic cylinder to accelerate the process of draining the liquid from the pump cavity after the operation of pressure testing.

The disadvantages of the stand are its inability to test devices for eliminating leaks in pipelines, as well as the complexity of the multiplier node and its lack of distinction for pneumatics.

There is a known method of testing an existing pipeline, designed to test for leaktightness of individual sections of the production pipelines themselves directly in the territory of their location. An apparatus for carrying out the method includes a movable cylindrical annular chamber with a seal.

cl

Os

oh oh

at the ends inserted into the test section of the pipeline to create in it an excessive test pressure, and to facilitate the work of the sealing cuffs, the chamber is pressed on both sides by pressure (prototype). The method does not serve to test the leakage devices, but the pipelines themselves. In addition, reliability is reduced due to abutment of the cuffs in fact unprepared for sealing the inner surface of the pipeline, there is no hollow filler, there are no vertical containers for filling it with gas, it does not eliminate leaks.

The purpose of the invention is to increase the functional capability of testing at low power of a gas source of pressure on liquid-liquid working environments with the supply of an adhesive-curing composition to the zone of defects.

The goal is achieved in that according to the method, which includes an overpressure loading system, imitating a separate section of the pipeline under the conditions of a stand that, with a filler, forms an isolated annular chamber, in the overpressure loading system, an initial pressure Pc is sequentially generated within the power source of the gas source and increase the level of the operating pressure in the loading system by increasing the pressure of the hydraulic system to P values, taking into account the solubility of the gas in the liquid VT + V6 - VH

VT - VH +

Hh

H

V6 (1 + pk)

where V (f, VK, VT - the volume of the tank-filler, solid filler and the test section of the pipe

H, h - the height of the filling tank and the level of liquid in it;

ex is the ratio of gas solubility in a liquid

Stand for the implementation of the method of testing devices for localizing leaks of hydraulic-pneumatic tubing, containing a hydraulic pump with a pressure and suction lines, hydraulic tank, a compressor with a pressure compressor line, a test section simulating a pipeline with flanges, an inlet, equipped with a vertical filling tank, volume Vj to the bottom the part of which is connected to the drain line connected to the suction line of the hydraulic pump, and to the upper part of which the pressure and compressor lines are attached — and the inlet is equipped with a vert A rock tank filled with a flange fixing one end of the tested pipeline section with simulating defects in the form of a series of holes into which solid filler is inserted with a gap in the form of a cylinder plugged from one side and concentrically attached to the other flange of the pipeline section, with flanged bolts Made with lip seals and gaskets.

Thus, the test bench allows the proposed method to test existing leakage prevention structures as

5 liquid and gas as from the main and field pipelines. FIG. 1 shows a schematic of the stand, a general view; FIG. 3 - tested on the stand and the device installed on it

0 to locate leaks; FIG. 3 is section A-A in FIG. 2.

A bench for implementing a method for testing devices for localizing leaks of hydro-pneumatic tubing includes

5 vertical filler tank 1 with volume Ve in the form of a nozzle H in height, plugged on both sides and located in recess 2 A drain line is attached to the lower part of the vertical filler tank

0 3, connected through the valve 4 with the suction line, closed by the valve 5 of the hydraulic pump 6. The latter through the valve 7 and the safety valve 8 with its pressure line 9 is connected to the upper part

5 vertical filling tank 1 Drain line 10 departs from valve 8 to receiving tank 11 A compressor line from compressor installation 13 with pressure release line 14 and pressure gauge line 15 as well as input line 15 are also connected to the upper part of vertical filling tank 1. a nozzle 17 connected to a flange 18 fixed to the flange 19 of one end of the test section of the pipe 5 of the pipeline 20 of the volume VT with areas imitating defects in the form of a series of holes 21. On the pipe 20 a device 22 for eliminating leaks is installed. The other end of the pipeline 20 is closed by a flange 23,

0 attached to the flange 24 of the pipeline 20. To the flange 23 is fixed a solid filler inserted with a gap in the pipeline 20 in the form of a hollow cylinder 26 plugged with a plug 25, concentrically fixed onto the flange 23

Callout 27 shows the level h of the liquid in the filling tank 1 The bench is equipped with the necessary thermometers. The device tested on the stand contains two half-collars 28 and 29 mounted on the pipe 20 on a rubber gasket 30, and a discharge mechanism 31 in the form of a cylinder 32 with a sealed rubber chamber 33 filled with an adhesive composition, closed by a ball 34 and supported by a spring-loaded ball 35, while the opening 36 is open and communicates with an opening 37 connected to the passage opening 21 in the pipe 20. A piston 38 with a power screw 39 and a steering wheel 40 is placed on top of the cylinder 32 filled with hydraulics.

Work on the bench is as follows.

After the test pressure is established at the test bench, first by the compressor 13 and then by the hydraulic pump 6 and ensuring that the gas passes through one of the graduated holes (the others are closed), install the device (Fig. 2 and 3), and the hole of the pass 21 should coincide with the hole 37 in the gasket 30. The passage of the agent located in the pipe 20 should go through the opening 37 to the inside of the injection mechanism 31 and go through the opening 36 to the atmosphere. Testing at this stage boils down to checking ease of installation, safety, ease of operation and other characteristics. By turning the screw 39 by the steering wheel 40, the piston 38 is moved downward, while the fluid inside the cylinder is compressed. The latter, in turn, presses against the rubber chamber 33. and the adhesive composition contained therein presses against the ball 34, opening the valve. The ball 34, opening the valve, lowering the pressure on the ball 35, compresses the spring, and the latter closes the opening 36, blocks the output of products from the pipeline, and the adhesive composition enters the opening 37 and then into the defect of the wall of the pipe 20, plugging the opening. The test at this stage is to check the reliability of the overlap of product receipt from the pipeline, the ease of rotation of the handwheel, the need to heat the defect area filled with adhesive compositions, to determine its seizure, and other points characterizing the reliability of the leak. After that, clamps 28 and 29 are removed, the ease of detaching the adhesive composition from the valve mechanism is checked, and recommendations are given on whether it can be reused or whether the single-use rubber chamber is counted, etc.

Example. When tested by hydraulics, air is released from the system and filled with water to the required pressure.

When testing with a gas-liquid medium, they have a pipeline with a diameter of 275 mm operating at a pressure of P 50-60 atm, the product is oil with gas, to the zone of defect 5 of which it is necessary to feed the adhesive-hardening composition with excess pressure

Suppose the proposed stand is located in a factory where there is a single-stage compressor 13 providing a pressure of no more than Pk 5 atm, about 10 times less. In order to raise the test pressure to the desired value, the system is filled with air to Pc 5 atm. 5 Then the system is filled with water using a hydraulic pump along pressure line 9. At the same time, the gas volume in it. given to Pi 1 ar, taking into account the solubility of the gas in the liquid is equal to

0 Vi Pk (VT + V6 - VH --pp-- Vf a P),

where V6 VH, VT are the volumes of the filling tank, solid pspopnitel and the test section of the pipe;

5H h - the height of the filling tank and the liquid level in it;

a is the solubility coefficient of a gas in a liquid.

So, if you fill tank 1

0 (liquid up to height h, volume / b filled with air will remain in it

v61 - l kill

The total volume in the system, filled with 5 compressed air at a pressure P, will be

Vp VT - VH +

Hh

Ve

 R vIVH ,,

Since, according to the Fight h-Mariott equation, PVp - PiVi const, then having solved 0 bodies, but P {for Pi 1), we have

P VI-P p VP-PK

VT -f V6 - VH - -H-JL v6 a P VT-VH + -t -V6

45 Having solved this equation for P, we have

VT + V6 - VH

Р Рк

VT VH + - Frb-V6 {1 + aPK)

Gas leaks due to relatively small volumes are not taken into account. This dependence allows us to choose the main parameters of the test bench, on which the required test pressure P can be developed.

Claims (2)

1. A method for testing devices. Locating leakage of hydropneumatic pipes, including an overpressure loading system for an individual test section of the pipeline and checking its tightness by forming an insulated annular chamber near the surface, so that, in order to increase functionality tested at low power gas pressure source on gas-liquid working media with the supply of the adhesive-curing composition to the defect zone, in an overpressure loading system Consequently, an initial pressure P is created within the power of the gas source and increases the level of the operating pressure in the loading system by increasing the hydraulic pressure to P values, taking into account the solubility of the gas in the liquid. R Pk (Ut + Ub-Ui) f K Ut-Un + - p-Ub (1 n-aRk) where Ub, Un, Ut are the volumes of the filler tank, the solid filler and the pipe section to be tested; H, h - the height of the filling tank and the level of liquid in it; a is the solubility coefficient of a gas in a liquid. 2. Stand for testing devices for locating leakage of hydropneumatic tubing, containing a hydraulic pump with pressure and suction lines, a hydraulic tank, a compressor with a pressure compressor line, a test pipeline section with flanges, an inlet pipe, and that it is equipped with a vertical filling tank, to the lower part of which a drain line is connected, connected to the suction line of the hydraulic pump, and to the upper part of which a pressure and compressor lines and an inlet pipe connected to the flange are attached. One end of the test section of the pipeline with simulating defects in the form of a series of holes, into which a solid filler is inserted with a gap in the form of a cylinder plugged on one side and a pipeline section concentrically attached to the other flange, with the flange bolting made with lip seals and gaskets. ate OS en 0 Js. 26 thirty