US1423860A - Oil-well pump - Google Patents

Description

1.1. LARKIN AND R. L. GORDON.

0|L WELL PUMP.

APPLICATION FILED SEPT. 1, 1921.

Patented July 25, 1922;

[nvezo/ John, J' Larkin. Raben? L- GUTCOL- Ubllllbl STATES PATENT QFFIQ.

JOHN' a. LABKINQOF sr. LOUIs, MISSOURI.' AND ROBERT L. GORDON, OP DARrLEs- VILLE, OKLAHOMA., AssIGNORs To BELL PUMP COMPANY, or BARTLESVILLE, OKLAHOMA, A PARCJNNRsIIIP OOMPOsED OP JOHN J. LARKIN, ROBERT L. GOP.- DON, AND A. W. sIIULrPIIs, or INDEPENDENCE, KANSAS.

OIL-WELL PUMP.

inaaeco.

Application filed September 1, 1.921.

T0 all whom it may concern.:

Be it known that we, JOHN J. LARKIN and ROBDRT L. GORDON, citizens of the United Y States, residing at St. Louis, Missouri, and

i s cription, such as will enable others skilled in the art to `which it appertains tomake and use the same, reference being had to the accompanying drawings, forming part of this application.

Our invention relates to oil well pumps and consists in improvements in the type of pump disclosed in Bell Patent No. 991,600. The pump there shown has been manuactured in large quantities and has gone into extensive use, but the parts have been designed for a given stroke, and increasing the stroke destroys the effectiveness oit the pump although a greater stroke is Otten desirable. One object of our invention is to provide `a working barrel for such a pump. which, whether comprising original or reiitting equipment, will permit the use of any i requisite stroke.

We have also found that the settling of sand about the pump working barrel impairs its operation, and another object of our invention is to eliminate the accumulation of sand around the pump.

Additional objects and advantages of our invention will appear in the following description and in the accompanying drawings forming part of this specification, in which- ?Figure 1 is a vertical section through the lower end of a well equipped with our improved pump;

Figure 2 is a detail ot the working barrel drawn on an enlarged scale, and, f

Figure 8 is an enlarged view of the lower end of one of the pump tubes.

Figure 4 shows a modified form of the working barrel.

rThe outer wall 1 of the pump is oined to the well tubing 2 and forms an extension of the same. A bottom casting 3 closes the lower end of the pump except for the entry ports for the oil.

Mounted in the bottom casting 3 is a pump working barrel 4 consisting of a length of tubing which is crimped at a substantial dis- Specication of Letters Patent.

usual plunger 8 and check valve 9.

Patented July 25, 12252;.

Serial No. 497,570.

tance above its lower end to provide a seat 5 forthe pump standing valve 6.

A hollow pump piston 7 is slidable within working barrel 4 and is equipped with the The upper end of piston 7 is secured to a clutch housing member 10, and depending from member 10 and surrounding working barrel 4 is a short downtake tube 11. Depending` from member 10 and surrounding tube 11 is a downtake tube 12 which extends substantially below the lower end of tube 1l.

As explained in the above mentioned patent, the space between the working barrel 4 and tube 11 forms a chamber for the reception of gas the pressure of which prevents the passage of oil containing sand, etc., to the plunger cups and valve.

The lower end of tube 12 is deeply recessed or notched to provide teeth 13 which are adapted to be thrust into the sand, etc., settling to the bottom of the pump and to continually agitate same so that it may be discharged with the oil from the well. The lower ends of teeth 13 are preferably beveled for more eEective work on the pump de posits.

The commercial pump manufactured under the above mentioned patent, was designed for a 20 stroke and was only effective when the stroke did not exceed that distance. This is because when the stroke exceeded 20, the bottom of tube 11, on the upstroke, rose so close to the top edge of working barrel `4 that the gas chamber normally formed by the telescoping of the tube 11 with the working barrel no longer existed and consequently thefiuid surrounding barrel 4 was permitted to rise on the inside O the tube 11 and flow over the top of the working barrel carrying the destructive sand with it.

In practice, it was found that in certain circumstances it was necessary to have a pump which could be operated with a stroke exceeding 20, and to adapt the manufactured pump for this purpose, it became necessary to'increase the length of the tubes 11 and 12 and to correspondingly increase the height of the working barrel 4 and to increase the length of the outer shell l.

Because of the gas which tends to accumulate between .the standing valve 6 and plunger S.,

cult and expensive we prefer to provide a seat Jfor the standing valve spaced Yfrom the bottom of the pump.r

This was previously accomplished by threading the-lower interior of working barrel 4 and securing an extension therein which raised the working` barrel the necessary distance and the lower end of which was screwed into the bottom casting 3'. This necessitated the cutting oi' threads on the interior of the lower end of the working barrel and at both ends of the extension, which threads had to be very raccurate in order to preserve the alinement of working barrel 4 and outer shell l. lt necessitated a new bottom casting adapted toy tit the smaller diameter oi' the extension and consequently the stocking of two sizes of bottom castings by both the manufacturer and the operator.

lVith our improvement, the *onlyl additional operation on the working barrel is that ot forming the seat 5 for the standing,` valve, an operation which is easily and quickly completed with the proper tool and inwhich extreme accuracy is not essential.

lf preferred the standing valve seat may be provided as shown in Figure 4 by inserting a pipe 14 of smaller diameter in barrel 4 and securing the two together so that the upper end 15v ot pipe 14 i-s located at the same height as the crimp in pipe 4 in Figure l.

le are aware that other modifications of our invention may be made without departing1 from the spirit thereof, as indicated by the following claims:

l. ln an oil wel-l' pump, a casing, a bottom casting` therefor, a working barrel seated in said bottom casting, a standing valve seated in saidA working; barrel ata substantial distance above said bottom casting, a reciprocatory plunger in said working barrel.7 and a discharge chamber surrounding said barrel`r the wall' ot which chamber reciprocates with said plunger, and the lower end of said wall, at the bottom of its stroke,v eX- tends below said standing valve but is spaced substantially 'from said casting.

2. ln an oil well, a pump device comprising` a working` barrel' adapted to cooperate with the pump casing to form a pocket and provided with a standing valve seat at a.

substantial distance above-Lthe bottoni of the pocl et a discharge chamber wall surrounding said barrel and extendinginto said pocket and providedl with a toothed lower end which` extends below said standing valve upon the down stroke ot' the pump.

Iny testimony whereof we hereunto atliX our signatures this 27th day ofAugust, 1921.

JOHN J. LAB-KIN. ROBERT L. GORDON.

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