US1497326A - Pump - Google Patents

Description

`Fume 10, 1924. 1,497,326

G. H. c. VAN KEULEN Y PUMP Filed OCT.. 25. l1921 .fw/enfer.-

'ade'r/dif Hendrikus C/erv/(x van Kw4/en wmf Yton or tion, which impairs the action of the been found.

plunger, respectively. The casing stroke of the pump. To this Patented ilui-ie 10 19240 nur hetllt PUMP.

I Application filed October 25, 1921. Serial No.v 5l0,3`4l.l t

' To all whom it may concern Be it known that I, G'onnriunns HEN- nniii'ns 'Cnniiirx vivv KnULnN, a subject4 of the Queen of the ,Nether-lands, residing at The I'Iague, Netherlands, have invented certain new and useful Improvements in Pumps, of which the following is a specification. Y f

When raising impure or cori'osive liquids, for instance, grittymineral oils, byl means of a pump the inconvenience is experienced that the packing material of the pump pisplunger is liable to rapid deteriorapump and finally renders it inoperative. r.Vl/'hen pumping` mineral oils from considerable depths it even occurs thatvvthe grit-*attacks tlie packing so eagerly that only after la few hours operation therpump must bewitlidrawn from the bore for repair and" then again lowered, which, asy will be understood,

seriously reduces the oil production.

Many suggestions have beenr oHered to preclude these inconveniences, but as far as I am aware no sovereign remedy has as yet My present invention has for its obj ect to effectively protect the packing material of vsuch pumps from corrosion and with this objectin view I proceed as described hereinafter for raising mineral oil, although I do'not limit myself to this application of my novel means. f

Itis well known in the art that raising oil through bore holes sunk for this purpose is often effected by means of plunger pumps lowered into the bore, a series of sections or lengths of tubes and rods being successively addedY to the pump cylinder and to the and the plunger of such pumps are provided with a suction valve and with a delivery valve, respectively, and the verticalreciprocation of the plunger rod causes the oil to rise in the tube by which said rod is enclosed.

Now, in accordance with my present in- Vention, tlie plunger is loaded by a column of liquid (hereinafter called innocuous liquid) which has no deteriorating effect on the packing material of the plunger, and which exerts on the plunger a pressure eX- ceeding that brought about on the plunger by the liquid to be raised (hereinafter'called injurious liquid) during the delivery end the pump is provided with two pipes or series lengths of tubes, the one containing the innocuous liquid, the `otheiiservingfor-raising the injuriousA liquids. Said tubes, .or series of sections of tubes, may be ydisposed side by side, or the one yinside the other. In the latter case, the inner tube while serving for raising the injurious liquidk acts as plunger rod, whereas the innocuous liquid fills up the intermediate space between both tubes. d f.

The required overpressure of the innocuous liquid on the plunger may bebrought about -by various means. Said innocuous liquids may, for instance, have au greater specificweiglit .or a greater head than the injurious liquid, or it may be loaded by gas or accumulator pressure. liquid may, vfor instance, bewater, lout in case the injurious liquid may not be mixed vwith water I- may .use purified injurious liquid instead. As will be funderstood, the means' to be employed should ensure the required overpressure under all conditions irrespective of actions of the mass, frictioiial resistances, etc. This may be realized by incorporating in the plunger rod suitable means, for instance, jars, allowingsaid rod to raise tlie plunger but preventing it from forcing the plunger downwards duringtlie delivery stroke,.so that the driving force on -the plunger during this stroke must loe suprIhe innocuous' plied by the overpressure of the innocuous.

liquid. Should said overpressurefnotsuiiice to force the plunger down, lthe pump would stop and the pumping engine would run under no-load condition. If, for instance from inadvertency, the .oil delivery pipe should be shut olf while the pump engineis.

ruiming, no pipe fracture can occur, for in this case the plunger'will stop as soon as the pressure `of the liquid to be raised-abstract- -iiig frictional resistances-fequalizesthat of the innocuous liquid. Y

lVlien the delivery pipe is disposed inside the pipe containing the innocuous liquid, it would offer serious difficulties to arrange the j arsimmediately above the plunger. In order that also in this case the innocuous liquid may always have a certain overpressure the inner pipe may be couiiterbalanced outside the bore and jars may, if necessary, be provided above the point wliei'e said pipe is engaged by the counterbalancing means.

The annexed drawing shows, by way of eX- ainple, longitudinal sectional views of two deep well pumps embodying my invention. I

wish it to be well understood, however, that my invention is not limited to such pumps and that it may be applied whenever it is required to pump injurious liquid against overpressure.

Fig. l shows a deep well pump liavingthc auxiliary pipe and the delivery pipe arranged side by side, whereas Fig. 2 is a somewhat diagrammatic showing of such a pump in which the delivery pipe is provided inside the auxiliary pipe.

In Fig. 1, two pipes 2 and 3 are screwed from above into the pump casing 1, a nipple 4 being screwed into the bottom thereof. The lower part of the pipe 2, which forms `the pump cylinder, encloses the plunger 5.

The ball delivery valve vertically below pipe 3 is designated by 6, the ball suction valve in nipple 4 byl 7. `Associated with the plunger 5 are the jars composed of a rod 9 having a collar 1() projecting into and slidably 'mounted in a tubular member 8, but it will be understood that the jars may be of any other suitable construction. VF rom the previous statements it followsthat the amount of axial freedom of movement oi rod 9 within tlieftube 8 must exceed the length'of stroke of the plunger 5. The pipes 2, Sand the rod 9 extend to the mouth of the bore.

During the operation of the pump the pipe 2 is filled with innocuous liquid, for instance water, the injurious liquid (crude oil) being pumped through pipe 3. Owing to its' higher specific weight the water exerts on the plunger a pressure which exceeds lthe oil pressure on the bottom face of the plunger during the delivery vstroke thus causing the thin iilm of innocuous liquid to iiow downward past the piston and so preventing contact of injurious liquid with the piston. If necessary, this overpressure may 'still be increased by applying additional gas or accumulator pressure.

In Fig. 2, the delivery pipe 11 acts at the sanietime as plunger rod. The plunger 16 Y is mountedk in the cylinder 17 which forms part of the exterior pipe containing the innocuous liquid. The delivery pipe vor plunger rod is Acounterbalanced. above the bore by a lever 12 provided with a counterweight and actuated through a beam 13 and a coupling rod 14, jars 15 being interposed between the pivot of said rod and the pipe 11. The pipe 2 may be employed for washing 'the pump after the plunger 5 has been with- 2. A pump comprising a pumping tube,

a plunger therein, a combined plunger i'od and delivery tube, an auxiliaryy casing surrounding the delivery tube and containing fluid, operating means for the plunger rod,

and a j ar for connecting the plunger rod and the operating means; said jar insuring of positive operation of the plunger, by means of said operating means, in one direction only, operation or' the plunger in a reverse direction being effect-ed by pressure ofl the i'luid in the auxiliary casing.

3. A pump` comprising apumping tube, a plunger therein, a combinedV plunger rod and delivery tube, an auxiliary casing sui'- rounding the delivery tube and-containing fluid, operating means for the plunger rod, and a jar 'for connecting they plunger rod and the operating means; the plunger and the plunger rod being balancedby a counterweight.

11. A pump according to claim l, said fluid in the auxiliary casing remaining substantiallyv constant in amount, and vunchanged, during operation of the pump.

5. A pump according to claim 2,A said auxiliary casing being out of communication with said delivery tube.

6. A pump according to claim 3, said auxiliary casing being out of communication with said delivery tube.

In testimony whereof I atlix my signature.

GODEFR-IDUS HENDRIKUS CLERKX van KEULEN.

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