US1888125A - Paraffin liquefying device - Google Patents

Description

Nov. 15, 1932. w. 1. HART PARAFFIN LIQUEFYING DEVICE Filed May 4, 1951 INVENTOR ATTORNEY Patented Nov. 15, 1932 UNITED-STATES WILLIAM J. HART, orV SPBINGDALE, ARKANSAS, AssIGNon ,To vHART iano'rnnns V,AND

COMPANY, A oonroRATIoNoF OKLAHOMA,

PARAFFIN LIQUEFYInG y niszvroi:

Applieation med May A, 19311." Asernu Naf 535,023,

My present invention has reference-to parain liquefying device for liquefying and removing parallin from the tubing of a pumping well when pumped, and has for its general object a device for this purpose of a construction designed to simplify and materially improve the parain liquefying device upon which I have applied for U. S. patent protection on Sept. 13, 1929, Serial No. 392,403.

The invention will be fully and comprehensively understood from a consideration ofthe following detailed description when read in connection with the accompanying drawing which forms part of the application, with the understanding, however, that the improvement is capable of extended application and is not confined to the exact showing of the drawing no1` to the precise construction de- -scribed and, therefore, such changes and modifications may be made therefrom as do not affect the spirit of the invention nor exceed the scope thereof as expressed in the appended claim.

In the drawing:

Figure 1 is a sectional view through a portion of a well casing showing the devicethere- 1n.

Figure 2 is a similar view but showing the device in section. s

Figure 3 is a sectional view approximately on the line 33 of Figure 1.

Figure 4 is a plan view of the disc valve.

Figure 5 is a sectional view through one of the valves and the ejector head.

In the drawing the numeral ldesignates a pipe. The pipe has its upper end screwed in the bore of a head member 2, and in the upper end of the head member there is screwed the upper portion 3 of the tubing, the lower portion of the tubing being screwed to the lower end of the pipe 1. The head 2 is provided with lateral openings which are threaded which communicate with the bore of the head andy in each of these angularly disposed openings there is screwed a valve casing 4 that has its inner end provided with a valve seat for a valve 5. The stem of each vof the valves 5 has a piston 6 that is adjustably connected to its outer end and infiuenced by a spring 7 for moving the piston in one direction in a cyl-l' inder 8 that is arrangedv centrally inthe cas# ing-4 and which falso influences the valve 5 to seated position, This valve 'construction is similar to that set forth infmy-referred Itov pending application Serial No. 392,403;-r The pipe'l is partly surrounded 'by a tubular sleeve" 9, the `said sleeve carrying on its lower'end af' substantially cup-shaped frubber packer 10 which Vis expansibl'e andV which frictionally contacts l'with the inner end-of the well casingA l-l.: The lower end of "the'tube is 'held v`in i spaced relation with the pipe' 1` throughthe mediumof a spider in the nature of lugs 12 carried bythe sleeve 9.' The upper end 'of' the sleeve, which terminates onlya slight 'disr tance away from the lower end of the head 2f is preferably I widened and has arranged' therein a spider in the nature of lugs 13 which? Contact with and space the said upper end ofthe` sleeve from the pipe 1.- The lugs 1,3 attheir outer edges .are flush with the upper end of the sleeve,vand with the said upperend of the sleeve provides a rest for a flat disc valve 14. 1 f v j Y The packer. 10 is provided for dividing the space in the well casing 11 outside the tubingV 3, into an -upper and a lower part and to act as a seal between the upper'and lower parts: and any i shape or construction of packers which lperform this vfunctionV may be employed.k f l y y Steam is introduced into the upper part ofk the `well into the-casingV 11 and passes down the well, inside ofthe saidcasing l1 and around the tubing 3A until it encounters the packer 10. -As the packer 10 seals the upper part of the well from the lower part the steam cannot pass the saidpacker. The result is 'that stoodv that the well-is pumpingk during this operation and the upwardiliow of oil caused` by the pumping, carries the steam and condensed wateralongfwith it.` The heat tromV the steam, thesteam and the hot-water both i.

inside -and. outside of the-*tubing 3 melt the lation of the paraffin. Therefore, most of theY paraiin enough to loosen it so that it is pumped out with the oil. Steam is introduced into the well at timed intervals which depend entirely upon the accumulation of the paraffin.

Since water is condensed from thesteam introduced into the casing 11 ,atl the top, this water drops until it is stopped by the packer Y 10. The only outlet for this water is through the valve' into the tubing. The valve 5 is above the packer 10 so that water willnot pass through the said valve 5 until there is enough water to bring the water level 'up to the valve. Consequently water. always stands above the packer 10 to the height'of the'valve 5 and this volume of water protects the packer from the live steam. Since the packer 10v in frictional contact with the bore of the casing, and dividing the space in the well casing outside of the tube into an upper and a lower part and eecting a seal between such upper and lower parts.

In testimony whereof I aiiiX my signature. WILLIAM J. HART.

seals the vupper part of the well from theV i i lower part thereof anyy pressure existing above the packer will have no efiect` upon the pressure below the packer and h ence the device will not produce any back pressure on thewell. A Y

`It is to be understood that the steamvisinvvtroduced into the well for a period of from 15 to 20 minutes, once every 12, 24 or 48 hours,

depending uponthe rapidity of the accumutime the pressure above andv below the pack- .i er 10 in the casing is the same. The gas from the wellnormally passes out ofthe casing 11 around the tubing 3 and into the gas line. When my improvement is used the gas rises in the casing 11 until it encounters the packer 10. As it cannot pass through the packer it travels through the sleeve 9 where it encounters the disc valve 14. The gas is stoppedby the disc valve 14 until it builds up a pressure sufficient to unseat the said valve, and onlyV sealed into an upper and flower part in the casing 11 so that during the steaming process no back pressure is created on the well.

Having described the invention,-I claim:

An oil well comprising a casing, a pipe arranged centrally therein, a headed member connected to the pipe and having peripherally spaced inwardly opening spring inuenced valves, a tubular sleeve around andV spaced from the pipe below the head and se-v cured to the pipe by circumferentially spaced lugs, said sleeve having its upper end arranged in close proximity to the lower end of.

the head, adisc valve slidable on the pipe Jfor closing the upper end of the sleeve, a member. surrounding the lower end of the sleeve and ist

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