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 numberUS2039621 A
Publication typeGrant
Publication dateMay 5, 1936
Filing dateDec 11, 1933
Priority dateDec 11, 1933
Publication numberUS 2039621 A, US 2039621A, US-A-2039621, US2039621 A, US2039621A
InventorsGuy E Behnke
Original AssigneeReed Roller Bit Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Apparatus for pumping deep wells
US 2039621 A
Images(2)
Previous page
Next page
Description  (OCR text may contain errors)

May 5, 1936. G. E. BEHNKE APPARATUS FOR PUMPNG DEEP WELLS Filed Dec. 11, 1933 2 Sheets-Sheet 1 1N VEN TOR.

ATTORNEY.

Guy E Behnhe IIIIIIIIIIII 'liIIIIJUIIWillllllllllllllflllllllllililillllllllllllllllllllll.rlllilllllll May 5, 1936. 'G.'E. BEHNKE 2,039,621

-APPARATUS FOR PUMPING DEEP WELT-.IS

' Filed Dep. 11, 1933 2 sheets-sheet 2 Patented lMay 5, 1936 e UNITED STATES 2,039,621 APPARATUS FOR PUIVIPING DEEP WELLS Guy. E. Behnke, Houston, Tex.,`assignor to Reed Roller Bit Company Houston, Tex., a corporation of Texas.

Application December 11, 1933, Serial No. 701,875 8 Claims. (Cl. 10S-179) This invention relates generally to apparatuses for pumping deep wells, and specifically to apparatuses for supporting sucker rod lines to reduce the strain thereon incident to the weight thereof, friction and inertia.

It is a common practice, particularly in pumping oil wells, to lower a long line of tubing from the surface of the ground to a point below the level of the oil in the well and to reciprocate -a y10 plunger Within and near the bottom of the tubing by means of a long line of sucker rods extending through the tubing and motivated by a pumping unit at the upper end. During normal operation the line of tubing remains filled with oil from top to bottom. On the upward stroke of the plunger and sucker rod line the entire column of oil is lifted a few feet, the weight of all this oil being carried, bythe plunger and sucker rod line. A downward return stroke is then made to pick up another charge of oil.

This method of pumping wells is not without serious objections which become more and more obnoxious the deeper the well. It is obvious that both rods and tubing suffer extension due to their own weight, and that in addition to this dead load stretch there is a live load or pumping stretch since the weight of the oil in the tubing is carried alternately by the sucker rods on the'up stroke and by the tubing on the down stroke. It is well known that further stretching of the sucker rods arises from friction and from inertia of the moving mass. Those practiced in this art are familiar with other objectionable phenomena such as over-travel and pounding of the plunger and whipping of the sucker rods. The undesirable result of the foregoing is that a very great strain is placed on the sucker rods and it is not uncommon for them to break, thereby incurring a great expense and loss of time. 40 Since these diculties present one of the foremost problems in pumping deep wells, many attempts have been made to develop apparatuses which will effectively relieve the strains in sucker rods during operation. This is usually done byv so disposing springs along the sucker rod and tubing lines that part of the Weight of the sucker rod line is supported by the springs and thereby transferred to the tubing. However, such springs. to be effective, must be large and unwieldy and 50 are not easily assembled in the limited space in the well.

It is the primary object of this invention to provide a new and improved means for relieving the weight of a long line of sucker rods, incident to 55 deep well pumping, to reduce the strain, prevent the resultant trouble, and permit the pumpingof wells deeper than can be pumped at the present time.

It is a specific object of this invention to provide a means to relieve such strains by utilizing 5 the hydrostatic pressure of the iluid in the tubing -to exert an upward force on the sucker rod line at an intermediate point or points.

Other objects and advantages of the invention will be apparent throughout the detailed descrip- 10 tion.

In the accompanying drawings, wherein, for the purpose of illustration, is shown a preferred embodiment of the means which carry out the objects of this invention, 15

Fig.` 1 is a vertical fragmentary sectional view of the apparatus inserted into a sucker rod line at a predetermined point within the tubing.

Fig. 2 is an enlarged sectionalview of a portion of the stuing box disposed between the hollow 20 rod and the tubing.

Fig. 3 is a diagrammatic layout of the device.

Figs. 4 and 4a, to be considered as one iigure, is a vertical fragmentarysectional view showing a plurality of boosters inserted into the sucker rod 25 line at predetermined points within the tubing.

While it is to be understood that' the scope of my invention includes quite dissimilar apparatus, all within the scope of the hereinafter appearing claims, I will now explain my invention by refer- 30 ence to the particular embodiment of the means, diagrammatically shown in Fig. 3. At every point within the oil filled line of tubing 3|, the oil exerts a hydrostatic pressure. I attach means to the sucker rod line (here the hollow piston 8) 35 at any point along the length thereof, or at a .multiplicity ofsuch points, in such a way that the said hydrostatic pressure is exerted upwardly on said means, thereby supporting or boosting the sucker rod line. Furthermore, `I provide sealing 40 means (here the stufilng box 2|) to prevent the hydrostatic pressure from also acting downwardly on the piston 8 to annul the boosting force. I then permit the fluid below these means to ow freely past the means to the portion of the tubing line above the means (here by way of ports Il, hollow piston 8, hollow rod 30, and ports I8).

Referring now to Fig. 1 and Fig. 2, I w'lll describe the preferred embodiment of the appa--l ratus illustrated by way of example. One section of the. usual oil string tubing is shown at I and another section at 'I. The section I is threaded at its upper end into a coupling 2 which in turn is joined to a section of tubing 3 which may or may not be of diameter larger than I.

the coupling I0.

This tubing 3 joins a coupling II attached to the lower end of the working barrel 5. The coupling 6 joins thesaid working barrel 5 to the upper tubing section 'I whose diameter is greater than that of the working barrel 5. The inside surface of the working barrel 5 is carefully reamed to provide a suitable bearing surface for the piston 8.

The hollow piston 8 comprises a cylindrical sleeve 9 threaded internally at each end to the couplings Ill above and II below. The upper coupling has central bore and is threaded to accommodate the lower end of the hollow rod I2. The lower coupling II tapers to a smaller diameter at its lower end where it carriesa female thread to engage the standard male thread of the uppermost end I3 of the lower string of sucker rods. The sleeve 9 is finished on its outer surface to give an oil tight sliding fit between it and the working barrel 5. 'Ihe lower coupling II has a number of perforations I4 whereby the inside of the piston 8 communicates with the oil space I5 in the lower tubing 3.

A coupling I6 joins the upper end of the hollow rod I2 to the lowermost end I 'I of the upper string of sucker rods. Perforations I8 in the coupling I6 provide a passageway from the inside of the hollow rod I2 to an oil space I9 in the upper tubing 1. The hollow rod I2 is finished on the outside to slide with an oil tight fit onv the inside surface of a stuing box about to be described. The stufling box consists of a tube 20 threaded at its lower end to engage the upper threaded end of the stuing bex proper 2I. The stufflng box 2| has an annular outside shoulder 22 which seats against the upper end of the working barrel 5. Packing rings 23 and spacers 24 seal the stufling box to the working barrel and are retained on the stumng box assembly by an annular ring 25 threaded to the lower end of the stuillng box 2l. The working barrel 5 has openings 26 communicating with the space outside of the working barrel and tubing. A spring 21 may be placed around the hollow rod I2 above the tube 20 to act as a buffer should the lower shoulder of the coupling I 6 descend very near the upper end of the tube 20.

It will be readily understood that reciprocation of the pump plunger is effected by operation of the string of sucker rods in a manner well understood in this art. The operation of the booster will now be described: Throughout the operation of the booster, oil stands in the space I5 between 4sucker rod and tubing, in the piston 8, in the hollow rod I2 and in space I9. The annular space 28, between the working barrel 5 and the hollow rod I2, however, communicates by means of openings 26 with the space 33 between the tubing 3| and the side 32 of the well. Against the under side 29 of the coupling I 0 acts a pressure due to the hydrostatic head of the whole column of oil up to the top of the well. This pressure exerts an upward force on the piston which is not balanced by the lower well pressure acting downwardly on the top of The pump piston carries the weight of the column of fluid and anything interposed in the sucker rod line, such that the effective hydrostatic pressure on it (taken by itself and without the pump piston) is in an upward direction, will act as a booster. The obvious effect of my structure is that the downward stroke of the sucker rod will be to displace sleeve 9 and coupling I0 against the hydrostatic head of the oil. The eiect of this displacement will be to give an upward thrust and thus relieve some of the lifting stresses in the sucker rod. I'he aforesaid upwardly exerted force is imparted by sleeve 9 and coupling II to the lower string of sucker rods, thus relieving the upper string of a portion of the weight of the lower string. In other words, the pressure on the upper surface of the pump piston is partly balanced by the pressure on the lower surface of the coupling II.

l Without the apparatus disclosed herein, the pressure on the upper surface of the pump piston is not even partly balanced. It is also readily seen that when it is desired to remove the apparatus from the tubing the reciprocating parts may be raised until the upper face of the coupling I0 engages the lower face of the ring'25 whereupon the entire stuiiing box assembly may be lifted out of the well along with the sucker rods. The booster may later be returned to operating position by reversing this process.

Figures 4 andA 4a, to be considered as one figure, shows a plurality of my boosters for use in deeper wells, in which it would be economically expedient to use more than one booster, as shown in Figure 1. The primary booster, shown in Figure 4, is identical in-every detail with the device shown in Figure 1, and is placed relatively near the working piston of the oil well pump. The secondary booster, as shown in Figure 4a, is substantially identical with that shown in Figure 4. The secondary booster is placed relatively upward in the tubing from the primary booster, the usual sucker rod 34 connecting the primary and secondary booster so that they may work in conjunction. The operation of both of the boosters shown in Figures 4 and 4a is identical with the booster shown in Figure 1, but the effect of having a plurality of boosters interposed in the sucker rod line at predetermined points is to relieve still further the lifting stresses in the sucker rod and to increase the eifectiveness of myinvention, especially in deep wells which heretofore have been too deep to pump successfully without a great deal of difficulty.

From the above, it is obvious that any number of my boosters may be interposed in the sucker rod line of a well-pump, the optimum number of boosters depending solely on the depth of the well.

It Will be apparent in view of the foregoing that I have provided a new and useful means for overcoming serious disadvantages in the present methods of pumping deep wells, whereby the strains incident thereto are greatly relieved, whipping and pounding of sucker rods are minimized and deeper wells can be, successfully pumped. Various changes in shape, size, and arrangement of parts may be made in the particular embodiment of my invention herein shown and described, without departing from the spirit of the invention or the scope of the claims.

I claim:

I1. In well pumping apparatus. the combination of a line oftubing', a line of sucker rods in said tubing, means reciprocable by said sucker rod line to pump uid upwardly through said tubing, and a plurality of supporting means connected to said sucker rod line in spaced vertical tandem, each of said supporting means comprising a hollow piston and a. hollow rod connected to and above said piston, sealing means between the tubing and said rod, said rod communicating with the interior of said tubing only at a point above said sealing means, and said piston communicating only with the interior of said rod and with the interior of said tubing below said piston, said tubing communicating with the well at a point between said piston and said sealing means, said sucker rod line with said supporting means being removable upwardly through said tubing without disturbing the position of said tubing in the well.

2. In well pumping apparatus, the combination of a line of tubing, a lineof sucker rods in said tubing, means reciprocable by said sucker rod line to pump fluid upwardly through said tubing, and l a plurality of supporting means connected to said sucker rod line in spaced vertical tandem, each of said supporting means comprising a hollow piston and a hollow rod connected to and above said piston, sealing means between the tubing and said rod, said rod communicating with the interior of said tubing only at a point above said sealing means, and said piston communicating only with the interior of said rod and with the interior of said tubing below said piston, said sucker rod line with said supporting means being removable upwardly through said tubing without disturbing the position-of said tubing in the well.

3. In well pumping apparatus, the combination of a line of tubing, a line of sucker rods in said tubing, means reciprocable by said sucker rod line to pump uid upwardly through said tubing, and a plurality of supporting means connected to said sucker rod line in spaced Vertical tandem, each of said supporting means comprising a hollow piston and a hollow rod connected to and above said piston, sealing means between the tubing and said rod, said rod communicating with the interior of said tubing only at a point above said sealing means, and said piston communicating only with the interior of said rod and with the interior of said tubing below said piston.

4. In well pumping apparatus, the combination -of a line of tubing, a line of sucker rods in said tubing, means reciprocable by said sucker rod line to pump uid upwardly through said tubing, and a supporting means connected to said sucker rod line and comprising a hollow piston and a hollow rod connected -to and above said piston, sealing means between the tubing and said rod, said rod communicating with the interior of said tubing only at a point above said sealing means, and said piston communicating only with the interior of said rod and with the interior of said tubing below said piston, said tubing communicating with the well at a point between said piston and said sealing means, said sucker rod line with said supporting means being removable upwardly through said tubing without disturbing the position of said tubing in the well.

5. In well pumping apparatus, the combination of a line of tubing, a line of sucker rods in said tubing, means reciprocable by said sucker rod line to pump fluid upwardly through said tubing,l and a supporting means connected to said sucker rod line and comprising a hollow piston and a hollow rod connected to and above said piston, sealing means between the tubing and said rod, said rod communicating with the interior of said tubing only at a point above said sealing means, and said piston communicating only with the interior of said rod and with the interior of said tubing below said piston.

6. In well pumping apparatus, the combination of a line of tubing, a line of sucker rods in said tubing, means reciprocable by said sucker rod line to pump iluid upwardly through ysaid tubing, a piston in said tubing and connected to said sucker rod line, said tubing having an opening to permit communication between the well and the interior of said tubing above said piston, means to seal the space between said tubing and said suckerrod line above said opening to prevent thefluid in said tubing from exerting a downward pressure on said piston, and means to cause the fluid in said tubing to exert an upward pressure on said piston to reduce the stress on said sucker rod line.

7. In well pumping apparatus, the combination of a line of tubing, a line of sucker rods in said tubing, means reciprocable by said sucker rod line to pump iluid upwardly through said tubing, a piston in said tubing and connected to said sucker rod line, stuffing box means to seal the a plurality of pistons in said tubing and connectedl to said sucker rod line, and'a plurality of means to prevent the fluidin said tubing from exerting a downward pressure on said pistons and to cause the iiuid in said tubing to exert an upward pressure on said pistons to reduce the stress on said

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2455022 *Aug 8, 1944Nov 30, 1948Schmidt Benjamin FSubmersible double-acting fluid piston deep well pump
US4661052 *Nov 19, 1984Apr 28, 1987Ruhle James LReciprocating down-hole sand pump
US7144232Dec 2, 2003Dec 5, 2006Locher Ben CWater well pump
Classifications
U.S. Classification166/105, 417/547, 166/243
International ClassificationF04B47/00
Cooperative ClassificationF04B47/00
European ClassificationF04B47/00