CN1273330A - Method for manufacturing stator of screw pump - Google Patents

Abstract

A technology for manufacturing the stator of spiral lobe pump features that the base of pump casing is fixed in the center of bottom in constant-temp box, a stator mould is positioned inside the pump casing, the casing cap of holding mould core is at lower part and the holding frame has the fill hole and escape hole. Its technological steps include blasting sand to internal surface of pump casint to remove rust, coating adhesive, coating demoulding agent on mould core, fixing the mould core in pump casing, putting in constant-temp. box, preheating, putting polyurethane prepolymer in container and heating, then heating curing agent, mixing them, pouring between mould core and pump casing, heating for curing, taking out stator and mould core and ageing stator. Its advantages are high antiwear nature increased by 7 times high compressive strength and good exchangeability.

Description

A kind of method of making screw pump stator

The present invention relates to the pump of a kind of special manufacturing lifting liquid from deep-well, relate in particular to a kind of manufacture method of making the pump stator of recover petroleum.

In the injection and the exploitation in thickened oil recovery and polymer flooding oil field, the mechanical efficiency of screw pump is apparently higher than other machinery such as centrifugal pumps.Therefore screw pump has obtained use more and more widely in oil field injection and extraction production.Yet the stator liner of screw pump is the core component of screw rod, and it directly influences working life, working efficiency and the manufacture cost of pump.For many years, the material of manufacturing oil pumping screw pump stator liner use is a nitrile butadiene rubber class material always.Manufacture method is also continued to use following process step always:

1, determine rubber compounding after, it is mixing that rubber is put into rubber mixing machine.

2, the inwall to stator case carries out the derusting by sandblasting processing, and coating adhesive.

3, the core rod that will coat releasing agent is fixed in the pump case, with adhesive casting machine the rubber after mixing is clamp-oned in the stator case.

4, send into sulfurizing pot, vulcanize with steam heating.

5, core rod is screwed out (demoulding) from stator.So far finish the processing of stator.

Production practices for many years show adopts the screw pump stator of above-mentioned material and method manufacturing that following shortcoming and defect is arranged.

1, the wear-resisting property of material is poor, so has limited screw pump and can only move below 500 rev/mins, otherwise can't reach the working life of expection.

2, adopt above-mentioned technology to make the screw pump stator investment greatly, the cost height, fixed equipments such as necessary equipment rubber mixing machine, adhesive casting machine and sulfurizing pot just can be finished above-mentioned manufacturing process.The screw pump of oil recovery usefulness requires pressure head height (greater than 10MPa), and stator length thereby requires the capacity of the tonnage of adhesive casting machine and sulfurizing pot all bigger all between 4-8M.

3, the pump stator that adopts above-mentioned material and technology to make exchanges poor performance, because the screw pump stator of oil recovery usefulness is elongated, causing squeezing casting pressure and sulfurize temperature is difficult to control, the result is, even the stator liner of unified specification, its contour projector separately are also different, this has brought many troubles and waste to the user, after stator liner lost efficacy often, the rotor of pump had also become funerary object.

4, the stator that adopts above-mentioned material and technology to make, its lining and pump case concentricity are poor.This is; Amount of deflection appears in the housing easily because elongated core rod lies in a horizontal plane in.This will cause the pump generation additional torque that is in operation, and vibrate simultaneously.

5, the stator liner that adopts above-mentioned material and technology to make, initial torque is big, and occurs seize often in the down-hole and can't start phenomenon, and this is that the thermal stability difference causes because the surface friction coefficient of rubber material is big.

6, the pump stator made from above-mentioned material and technology, the single-stage pressure head is low, and every grade can not surpass 0.35Mpa, otherwise seize, therefore can only be by increasing the requirement that progression satisfies lift, this has increased its manufacture cost again from another point of view.

The objective of the invention is to:

1, develops the good pump stator of wear-resisting property, thereby under the situation that guarantees the life-span, adapt to the needs of high revolution.

2, seek little, the cheap for manufacturing cost technological method of a kind of fixed equipment investment.

3, develop the screw pump stator that can exchange (referring to same specification).

4, develop single-stage pressure head height (greater than 0.5MPa) and the little screw pump stator of initial torque.

5, develop good concentricity, the screw pump stator that operates steadily.

The present invention takes following technological means to realize above-mentioned purpose.

At first in a constant temperature device with electric heating element, be placed with the fixedly set base of pump case in the middle of the bottom.

The core rod of moulding stator liner is arranged in the middle of the pump case, and the core rod bottom is connected with the plug of setting upright of setting upright core rod, and the core rod upper end is equipped with female and is set upright support.

The support of setting upright of nut and fixing core rod cooperates core rod is fixed on the pump case center, sets upright promising injecting glue and venting in the middle of the support and the plug hole that is provided with, carries out following process step in said apparatus:

1, the pump case inwall being carried out derusting by sandblasting handles.

2, the pump case inwall is evenly coated Chemlook 218 Bonds.

3, the pump case inwall is evenly coated releasing agent, or replace with the high temperature butter.

4, core rod is fixed in the pump case, and pump case is inserted in the constant temperature device.

5, start constant temperature device, to the core rod preheating, temperature is controlled at 100-120 ℃, and the time is 10-20 minute.

6, base polyurethane prepolymer for use as is put into container and be heated to 85-110 ℃.

7, curing agent (MOCA) is heated to 104-110 ℃.

8, curing agent is mixed stirring with performed polymer, mixing time 30 seconds-1 minute is solidified and the weight proportion of performed polymer is 12-17%.

9, mixed dosing is cast between core rod and the pump case, covers the top cover of constant temperature device then, be cured.The constant temperature device temperature is controlled at 90-110 ℃, and be 30-60 minute curing time.

10, from constant temperature device, take out stator, and core rod is taken out.

11, the stator after the demoulding is put back to constant temperature device again and carry out slaking, temperature is 90-110 ℃, time 2-5 hour, is finished product after the taking-up.

Do with pouring polyurethane rubber, the screw pump stator lagging material, for well temperature＜80 ℃ with AU2100AU2110 and AU2200, AU2210 is for the AU2300 of well temperature at 80 ℃-100 ℃, with AU2310.

The technological method of the manufacturing oil pumping screw pump stator that the present invention introduced compared with prior art has the following advantages:

1, saved main equipments such as rubber mixing machine, adhesive casting machine and sulfurizing pot, also saved the floor space in the factory building simultaneously, every average cost of screw pump stator is reduced to 1000 yuan/platform by original 3000 yuan/platform.

2, experiment showed, the stator that adopts this method to make, wear-resisting property improves 5-7 doubly, and this makes the high rotating speed screw pump of development become possibility.

3, experimental results show that, the stator single-stage bearing capacity that adopts this method to make is higher more than 1/4th than existing stator, therefore the comparable existing stator of the pump of same lift reduces progression 20%, in addition because the polyurethane surface friction factor is little, make initial torque obviously descend, the energy-conservation 15-20% of the comparable existing stator of the result of two factors.

4, because core rod has adopted vertical means of fixation, eliminate the gravity of its substantially horizontal, made the stator good concentricity of making, avoided the vibration in the running, had good interchangeability simultaneously.

Adopt the material of pouring polyurethane rubber as the oil pumping screw pump stator liner, thereby replace nitrile butadiene rubber of the prior art, polyurethane is a kind of polymeric compound between rubber and plastics, it have the excellent high-wear resistance 7-10 of rubber (be doubly) oil resistant, decay resistance be Nitrile Rubber 4-5 doubly, high strength hardness scope is wide, and impact resistance and thermal stability are all very superior.Therefore, pouring polyurethane rubber is a more satisfactory material of making the screw pump stator lining.Use for the oil well of well temperature less than 80 ℃:

AU2100, AU2110, AU2200, the AU221 casting type polyurethane is made the screw pump lining.Oil well for well Wen Genggao is made the screw pump lining with AU2300 and AU2310 casting type polyurethane, and the long-term serviceability temperature of AU2300 and AU2310 is up to 100 ℃, and water resistence is also fine.

Embodiment:

At first select an inside that the constant temperature device of the electric heating element that heat is provided is arranged, electric heating element can be connected with the control panel electromagnetic contactor by cable, and at the middle contact that is inserted with temperature transducer of housing one side, link on the temperature controller, the bottom is equipped with and is the fixing set base of pump case, pump case is placed in the middle of the constant temperature device, the core rod of promising moulding stator liner in the middle of the pump case, the bottom of core rod is connected with the plug of setting upright of setting upright core rod, there is nut the core rod upper end, it cooperates the center that core rod is fixed on pump case with the fixing support of setting upright of core rod, the plug hole of setting upright middle promising injecting glue of support and venting and being provided with, above-mentioned constant temperature device is the indispensable device of stator liner moulding and slaking, can be made into round or square.Its height determines that according to stator length temperature can be regulated arbitrarily between 90-120C, adopting pouring polyurethane rubber is substitution material is made following parameter with above-mentioned permanent exchange device pump stator:

Now desire to manufacture a screw pump stator, its structural parameter are as follows:

Screw rod cross section diameter of a circle: d=36mm

Throw of eccentric: e=3mm

Pump helical pitch: T=120mm

Pump stage number: S=30 level

Pump case internal diameter: D=62mm

1, at first determines to make the quantity of required pre-agglomerate of stator and curing agent.

The pre-polymerization scale of construction is calculated as follows:

Q _jA＝[π/4——(D ²-d ²)-4ed]T.S.γ

In the formula: Q _JA---required performed polymer quantity, Kg

γ---performed polymer proportion.1.2

The curing agent requirement, Q _MOCA=Q _JA* 12%

The whole as can be known stator need of two formulas performed polymer 5.648Kg in the related parameter substitution will be arranged, curing agent 0.678Kg.

2, by previous process steps 1-11, can make the finished product stator.

The material cost of making this stator is 550 yuan (comprising pump case and Bond).

Claims (1)

1. A kind of method of making screw pump stator, it is characterized in that: in a thermostat with electric heating element, be placed with the fixedly set base of pump case in the middle of the bottom, the core rod that the moulding stator liner is arranged in the middle of the pump case, the core rod bottom is connected with the plug of setting upright of setting upright core rod, core rod upper end by nut and fixedly the support of setting upright of core rod cooperate core rod be fixed on the pump case center, set upright promising injecting glue and venting in the middle of the support and the plug hole established, in said apparatus, carry out following process step:

   1) the pump case inwall being carried out derusting by sandblasting handles;

   2) the pump case inwall is evenly coated the Chemlock218 Bond;

   3) core rod is evenly coated releasing agent;

   4) core rod is fixed in the pump case and with pump case inserts in the constant temperature device;

   5) start constant temperature device to the core rod preheating, 100-120 ℃ of temperature control, the time is 10-20 minute;

   6) base polyurethane prepolymer for use as is put into container and be heated to 85-110 ℃;

   7) curing agent (MOCA) is heated to 104-110 ℃;

   8) performed polymer after will heating and curing agent mix and stir, and the time is 30 seconds-1 minute, and the weight ratio of curing agent and polyurethane is 12%-17%;

   9) mixed dosing is cast between core rod and the pump case, covers the top cover of constant temperature device then, be cured, temperature is 90-110 ℃, time 30-60 minute.

   10) from constant temperature device, take out stator, and core rod is taken out;

   11) stator after the demoulding is put back to constant temperature device again and carry out slaking, temperature-110 ℃ time 2-5 hour, is finished product after the taking-up.

   Do the screw pump stator lagging material with pouring polyurethane rubber, for the AU2100 that uses of well temperature＜80 ℃, AU2110 or AU2200 AU2210 select AU2300 and AU2310 for use for 80 ℃-100 ℃ of well temperature