Subsurface pump

Claim 2

A subsurface well pump comprising a first elongated stationary tubular member, a second elongated tubular member concentrically arranged with respect to the stationary tubular member and reciprocal with respect thereto, packing means interposed between the stationary and reciprocal tubular members, an annulus provided between the stationary and reciprocal tubular members and interposed between the packing means, traveling valve means carried by the reciprocal tubular member for admitting well fluid into the pump, discharge port means provided in the stationary and reciprocal tubular members for discharging the well fluid therefrom, and means for directing a lubricating fluid into the annulus between the stationary and reciprocal tubular members for lubrication thereof during operation of the pump.

Claim 3

A subsurface well pump as set forth in claim 1 wherein the means for directing a lubricating fluid into the annulus comprises a bushing for receiving the lubricating fluid therein, longitudinally extending passageway means provided in one of the tubular members, outlet ports provided in said bushing for directing a portion of said lubricating fluid to the longitudinal passageway means, and discharge port means provided in the said one of the tubular members providing communication between the longitudinal passageway means and the annulus for dIrecting the lubricating fluid into the annulus.

Claim 4

A subsurface well pump as set forth in claim 1 wherein back pressure valve means is carried by one of said tubular members whereby a relatively lightweight fluid may be admitted into the pump for mingling with the well fluid therein.

Claim 5

A subsurface well pump as set forth in claim 3 wherein the back pressure valve means comprises an outer housing having a fluid inlet therein, a valve seat secured within the housing in communication with the fluid inlet, a ball member cooperating with the valve seat for providing alternate open and closed positions for the back pressure valve, piston means reciprocally disposed within the housing for supporting the ball member, spring means engageable with the piston means for constantly urging the piston in a direction to provide a normal closed position for the ball member against the valve seat, outlet ports provided in the housing and in communication with the valve seat in the open position of the back pressure valve, said piston movable against the force of the spring means upon sufficient pressure differential acting thereon for opening of the valve whereby the lightweight fluid is discharged from the discharged ports and into the well fluid within the pump.

Claim 6

A subsurface well pump comprising a stationary working barrel, plunger means reciprocally disposed within the barrel, packing means interposed between the working barrel and reciprocal plunger means, an annulus provided between the working barrel and interposed between the packing means, traveling valve means carried by the plunger means for admitting well fluid into the interior of the plunger means, discharge port means provided in the plunger means and working barrel for discharging the well fluid from the pump, and means provided in the plunger means for directing a lubricating fluid into the annulus between the working barrel and plunger means for facilitating the reciprocation of the plunger means.

Claim 7

A subsurface well pump comprising a stationary working barrel, plunger means reciprocally disposed within the barrel, packing means interposed between the working barrel and reciprocal plunger means, an annulus provided between the working barrel and interposed between the packing means, traveling valve means carried by the plunger means for admitting well fluid into the interior of the plunger means, discharge port means provided in the plunger means and working barrel for discharging the well fluid from the pump, and means provided in the plunger means for directing a lubricating fluid into the annulus between the working barrel and plunger means for facilitating the reciprocation of the plunger means.

Claim 8

A subsurface well pump as set forth in claim 5 wherein the last mentioned means comprises a chamber for receiving the lubricating fluid therein, longitudinal passageway means extending through the reciprocal plunger, passageway means providing communication between the chamber and the longitudinal passageway for directing a portion of the lubricating fluid into the longitudinal passageway means, and radial bore means provided in the reciprocal plunger and extending into communication between the longitudinal passageway means the annulus for directing said lubricating fluid into the annulus.

Claim 9

A subsurface well pump as set forth in claim 5 and including back pressure valve means carried by the plunger means for admitting a portion of said lubricating fluid into the well fluid in the interior of the plunger means.

Claim 10

A subsurface well pump as set forth in claim 7 wherein said back pressure valve means comprises a housing secured within the plunger means, valve seat means secured within the housing and in open communication with the source of lubricating fluid, ball means cooperating with the valve seat to provide alternate open and closed positions for the back pressure valve means, piston member yieldably supported within the housing and engageable with said ball means for urging the ball means into engagement with the valve seat means to provide a normal closed position for the back pressure valve means, said piston responsive to pressure differential acting thereon for moving in a direction away from the valve seat means whereby the ball means is disengaged therefrom to provide said open position for said valve, and passageway means provided in the housing and in communication with the interior and exterior thereof for directing fluid to the exterior of the back pressure valve means in the open position thereof.

Claim 11

A subsurface well pump as set forth in claim 5 wherein the reciprocal plunger comprises outer sleeve means of an outer diameter slightly less than the inner diameter of the working barrel tO provide said annulus therebetween, inner sleeve means concentrically arranged with said outer sleeve means, the outer diameter of said inner sleeve means being slightly less than the inner diameter of the outer sleeve means to provide an annular space therebetween for forming said longitudinal passageway through the plunger means, bushing means supporting said inner and outer sleeve means within said working barrel, a chamber provided within said bushing for receiving the lubricating fluid therein, and bore means provided in said bushing for directing a portion of the lubricating fluid from the interior thereof to the longitudinal passageway, and port means provided in said outer sleeve for directing said lubricating fluid from the longitudinal passageway to the annulus between the plunger and working barrel.

Claim 12

A subsurface well pump as set forth in claim 9 and including back pressure valve means carried by the plunger means and disposed below the fluid receiving chamber in the bushing, said back pressure valve responsive to pressure differentials acting thereon to provide alternate closed and open positions for intermittently admitting the lubricating fluid into the well fluid within the plunger means.