Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS2349536 A
Publication typeGrant
Publication dateMay 23, 1944
Filing dateNov 7, 1941
Priority dateNov 7, 1941
Publication numberUS 2349536 A, US 2349536A, US-A-2349536, US2349536 A, US2349536A
InventorsBancroft Charles C
Original AssigneeBancroft Charles C
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Apparatus for preventing clogging of oil wells
US 2349536 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

May 23, 1944- C. c. BANcRoF-r 2,349,536

APPARATUS FOR PREVENTING CLOGGING OF OIL WELLS Filed NOV. 7, 1941 M ,Zgz 26 Patented May 23, 1944 APPARATUS FOR PREVENTING CLOGGING F OIL WELLS Charles C. Bancroft, Reno, Nev.

Application November 7, 1941, Serial No. 418,180

2 Claims.

This invention relates to apparatus for preventing clogging of subterranean wells, and more particularly to the prevention of accumulations of parailin and like asphaltic or bituminous materials in oil wells.

In the operation of oil wells, it has been found that parailn and other asphaltic or bituminous materials tend to collect on the pump tubing and around the structure in the lower part of the well. This accumulation builds up gradually until the well is substantially closed, so that proper flow of oil therethrough is seriously interfered with. When this occurs, it is necessary to stop production of the Well, and to clean the deposits therefrom before proper production can be resumed. v

The present invention has for one of its objects the provision of apparatus for preventing accumulations of such material in a well which might interfere with its proper production.

Another object oi.' the invention is to provide for the heating of the pump tubing in the lower part of the well to prevent accumulations of material thereon.

Still another object of the invention is to provide apparatus for circulating a heated liquid in heat transferring relationship to the pump tubing of a well to heat the same.

The above and other objects, advantages and novel features of the invention will be apparent from the following description when read in connection with the accompanying drawing, in which:

Figure 1 is a diagrammatic view illustrating one installation for preventing clogging of the well; and

Figure 2 is a similar view of an alternative construction.

As shown in Figure l, an oil well having a casing I0 therein is provided with a pump tube I2 extending to the bottom thereof and terminating in a perforated or screened portion I4, through which oil from the bearing strata may enter the pump tube. The tube I2 extends out of the upper end of the well and is provided with suitable pump means, indicated generally at I6. for withdrawing liquid through the tube.

In order to heat the pump tube adjacent the lower part of the well to prevent accumulations of parailin or the like thereon, there is provided. according to the present invention, a coil I8 of copper tubing or the like, wrapped around the pump tube adjacent the lower part of the well. If desired, the coil may partially cover the perforated portion I4 and may have its turns spaced to permit the iiow of oiltherebetween. The coil I8 is preferably formed of relatively small copper tubing and is permanently installed on the pump tube at the time it is placed in the well. One end of the coil I8 is connected by a pipe 20 which may be a steel tube with a high pressure storage tank 22 for heated liquid, such as oil, to be circulated through the coil. It will be noted that the pipe 20 extends into the well between the casing Ill and the pump tube I2. The opposite end of the coilis connected to a similar tube 24, likewise extending out of the well between the casing and the pump tube. It will be seen from the drawing that the coil is wrapped double with a return bend at its lower end and with both tubes 20 and 24 connected to its upper end so that a minimum space is required.

Oil to be circulated through the coil is heated in a heater, indicated at 26, the oil being circulated therethrough by a pump 28 from the lower part of a storage tank 30, the heated oil from the heater flowing into the upper part of the storage tank. From the top of the storage tank, heated oil is withdrawn through a pipe 32 by a high pressure pump 34, and is forced by the pump under high pressure into the high pressure storage tank 22. A by-pass 36, having a pressure relief valve 38 therein, preferably connects the storage tanks 22 and 30 to limit the pressure which can be built up in the storage tank 22. The pipe 24 is connected to the lower end of the storage tank 30, and may, if desired, be provided with a pressure gauge 40, to indicate the pressure in the return line from the well.

In operation, oil heated by the heater is withdrawn from the storage tank 30 by a pump 34, and is forced under high pressure into the tank 22. From this tank, it flows through the pipe 20 into the coil I 8 and through the coil, thereby heating the pump tube and the adjacent parts in the lower portion of the well to a temperature above the melting point of the paraiiin or other bituminous or asphaltic compounds. From the coil, the oil returns through the pipe 24 to the low pressure storage tank 30, to be recirculated.

I have found that the oil should be heated to a temperature of approximately 400 F., and should be forced into the tubing at a pressure of approximately 2000 pounds per square inch. For the normal well, a circulation of about barrels per day will keep the pump tubing and the adjacent parts at a high enough temperature so that paraiiin and the like will not accumulate thereon. Thus, by the use of the present invention, the well may be kept clear and open indefinitely, thereby eliminating the necessity for periodic cleanings.

Figure 2 illustrates an alternative construction, the parts therein corresponding to like parts in Figure l being indicated by the same reference numerals.

In this construction, the pump 28 withdraws oil through a pipe I2 from the oil storage tank, which may be a tank supplied from the well by the pump I6. This oil is forced through the heater 26 into the low pressure storage tank 30 and is pumped into the well by the pump 34 through the pipe 20 in the manner described in connection with Figure 1. From the pipe 20, the heated oil flows through the coil I 8 to`heat the pump tube I2 and the surrounding parts, and returns from the coil through a pipe u, which is tapped into the pipe l2, as shown.

In this construction, it is necessary to provide only one pipe extending into the well to conduct heated oil to the coil, the oil after circulating through the coil passing into thefpump tube l2 and being withdrawn from the well by the main pump I6. Otherwise, the system operates in substantially the same manner as that of Figure 1.

While two embodiments of the invention have been shown and described in detail, it will be understood that these are illustrative only, and are not intended as a. definition of the scope of the invention, reference being had for this purpose to the appended claims.

What is claimed is:

l. Apparatus for preventing the clogging of oil weils having pump tubing therein which comprises a coil of pipe coiled around the lower end of the tubing in contact therewith within the Well, an elongated pipe for conducting heated liquid through the well into said coil to heat the tubing, and conduit means to conduct liquid from the coil into said tubing.

2. Apparatus for preventing the clogging of oil wells having pump tubing therein which comprises a coil of pipe coiled around the lower end of the tubing in contact therewith within the well, an elongated pipe for conducting heated liquid through the well into said coil to heat the tubing, conduit means to conduct liquid from the coil into said tubing, and means above the well for heating liquid, and a pump for forcing the heated liquid through said pipe and coil and into the tubing.

CHARLES C. BANCROFT.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2639774 *May 31, 1950May 26, 1953Lloyd W FellerParaffin removal system for wells
US2911047 *Mar 11, 1958Nov 3, 1959Henderson John CApparatus for extracting naturally occurring difficultly flowable petroleum oil from a naturally located subterranean body
US2914124 *Jul 17, 1956Nov 24, 1959Oil Well Heating Systems IncOil well heating system
US3013609 *Jun 11, 1958Dec 19, 1961Texaco IncMethod for producing hydrocarbons in an in situ combustion operation
US3062289 *Jan 21, 1960Nov 6, 1962Charles E FooteOil well heater
US3140744 *May 29, 1961Jul 14, 1964Variperm CompanyOil well heater
US3343605 *Feb 17, 1965Sep 26, 1967Phelan Iii John HenryHeater for oil recovery
US3420302 *Apr 11, 1967Jan 7, 1969Edwards Guy GOil processing system
US4830111 *Sep 9, 1987May 16, 1989Jenkins Jerold DWater well treating method
US6756021Jan 26, 2001Jun 29, 2004Elf Exploration ProductionDevice for eliminating gas or paraffin hydrate deposits that form in well drilling equipment or in hydrocarbon production or transportation equipment
Classifications
U.S. Classification166/61
International ClassificationE21B36/00
Cooperative ClassificationE21B36/005, E21B36/00
European ClassificationE21B36/00, E21B36/00D