US20110079960A1 - Multi-Piece Pressure Operated Rings for a Downhole Pump Plunger - Google Patents
Multi-Piece Pressure Operated Rings for a Downhole Pump Plunger Download PDFInfo
- Publication number
- US20110079960A1 US20110079960A1 US12/575,211 US57521109A US2011079960A1 US 20110079960 A1 US20110079960 A1 US 20110079960A1 US 57521109 A US57521109 A US 57521109A US 2011079960 A1 US2011079960 A1 US 2011079960A1
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- ring
- seal ring
- tab
- segments
- assembly according
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- Abandoned
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- 239000012530 fluid Substances 0.000 claims abstract description 28
- 230000002093 peripheral effect Effects 0.000 claims abstract description 27
- 238000004891 communication Methods 0.000 claims description 3
- 239000003129 oil well Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
Definitions
- This invention relates to improvements in oil well pumps and more particularly to seal rings used in reciprocating subsurface oil well pump assemblies.
- a typical reciprocating subsurface oil well pump consists of a plunger and travelling check valve in reciprocating relationship within a stationary working barrel formed as a part of the oil well production tubing.
- the working barrel itself is provided with a standing valve and submerged usually in well fluid.
- the pump is normally secured to the lowermost end of a sucker rod string, which extends longitudinally through production tubing situated in the well bore.
- a reciprocating device at the surface either a traditional “horsehead” type or more recent wire line winch, alternately raises and lowers the string of sucker rods in the well bore.
- the wire line winch system typically includes a control means for rotating the winch in one direction for the upstroke and controllably releasing the winch in the reverse direction for the downstroke.
- a weighted oil well plunger-type pump must be capable, during the upstroke, of providing adequate ring seals for producing the fluid, while on the downstroke, the seal rings must be capable of permitting substantial release of the plunger so that it will fall to its bottom dead center position for the repeat of the process.
- U.S. Pat. No. 3,953,155 discloses a single-piece pressure responsive plunger ring arranged between adjacent spacers and shaped so as to expand radially in contact with the working barrel by action of the fluid being pumped.
- the ring has an annular groove in its upper surface that is tapered outwardly toward the outer face of the ring.
- the outer face of the ring is then tapered downwardly and inwardly to form a lip around the outer edge.
- an increase in fluid pressure causes the ring to expand and provide a seal with respect to the working barrel.
- the ring also has a gap to facilitate assembly onto the plunger and to facilitate radial expansion and contraction of the ring.
- U.S. Pat. No. 5,752,814 discloses use of a plastic sleeve positioned above and below the ring to effect embedment of sand and other abrasive particles in the plastic and protect the ring.
- a stainless steel or brass insert To thermally stabilize the sleeves and prevent their expansion due to pumping friction and elevated formation temperatures, a stainless steel or brass insert must be provided, further increasing the cost of the plunger assembly.
- U.S. Pat. No. 5,372488 discloses a ring composed of metal and having two or more interlocking semi-cylindrical flat ring segments.
- the outer face of the ring is not tapered. Similar to the operation of the U.S. Pat. No. 3,953,155, during the upward stroke of the plunger, an increase in fluid pressure causes the ring segments to expand outwardly and provide a seal with respect to the working barrel. During the downward stroke, a decrease in fluid pressure causes the ring segments to retract.
- the interlocking ring arrangement has significant disadvantages. Similar to the single-piece rings, the interlocking ring segments provide no consistent inter-space between the backside of the ring and the plunger when the ring segments are in their collapsed position, thereby requiring greater pressure for expansion during the upstroke and producing inconsistency in sealing efficiency between strokes. Because of the interlocking arrangement, a gap cannot be provided to facilitate radial expansion and contraction of the ring and allow for fluid flow to the backside of the ring. Rather, openings must be provided in the seal ring groove portion of the plunger in order for the groove to communicate with an interior flow channel and thereby allow fluid to reach the backside of the ring.
- a pressure responsive seal ring assembly for use in a downhole submerged pump assembly includes a plunger with a metallic cylinder and at least one seal ring groove in the cylinder for receiving a seal ring.
- the seal ring has two arcuate-shaped ring segments that interconnect in a non-locking manner. Each of the ring segments has a first and second end having an angular distance therebetween of less than 180°.
- a first tab extends beyond the first end of each ring segment and is received by a recessed portion in the first end of the opposing ring segment.
- a second tab extends beyond the second end of the second ring segment and is received by a recessed portion in the second end of the first ring segment. Under pressure the ring segments expand radially outward and resist fluid flow therebetween.
- the seal ring includes a raised pad located on a portion of an inner peripheral surface of the ring segments.
- the pad provides an effective inter-space for a fluid flow between the inner peripheral surface of the ring and the plunger body.
- a pad is also preferably provided on the inner peripheral surface of the first tab.
- the tabs and recessed portions are preferably dimensioned so that a gap in an outer periphery of the seal ring is formed when the ring is in its retracted position.
- the outside diameter of the seal ring in its retracted position is slightly less than an inside diameter of the working barrel in communication with the plunger. The gap, however, does not extend through to the inner peripheral surface of the ring.
- the seal ring also preferably has an annular groove in the upper surface of each of ring segment.
- the seal ring includes three arcuate-shaped ring segments.
- the ring segments include a tab-and-recess combination that interconnect in a non-locking manner similar to that of the two-ring segment ring assembly.
- FIG. 1 is an isometric view of a plunger ring having two arcuate-shaped ring segments that interconnect in a non-locking manner. A tab extension on each ring segment is received by an opposing recess in the other ring segment.
- FIG. 2 is an isometric view of the plunger ring in its assembled state.
- FIG. 3 is a top view of the assembled plunger ring.
- a number of pads located on the inner periphery of the ring provide an inter-space for fluid flow between the ring and a plunger body.
- FIG. 4 is a cross-sectional view of the plunger ring taken along section line 4-4 of FIG. 3 .
- An annular groove is provided on the upper surface of the ring segment to facilitate expansion and retraction of the ring segments.
- FIG. 5 is a cross-sectional view of the plunger ring taken along section line 5-5 of FIG. 3 .
- Each tab extension is received by a recess in the opposing ring segment and a joint between the mated but not interlocked ring segments is formed.
- FIG. 6 is a top view of the first arcuate-shaped ring segment.
- the ring segment includes a tab extension and recessed portion on one end and a second recessed portion on the other end.
- FIG. 7 is a front view of the first ring segment.
- FIG. 8 is a front view of the second arcuate-shaped ring segment.
- the ring segment includes a tab extension at each end.
- a recessed portion on one end receives the tab extension of the first ring segment.
- FIG. 9 is a top view of the second ring segment.
- FIG. 10 is a front view of a tubular plunger having a number of seal ring flanges. Seal ring grooves located between the seal ring flanges each receive the first and second ring segment.
- FIG. 11 is an isometric view of the plunger illustrating the assembling of the ring segments onto the plunger.
- the assembled ring segment provides a gap in the outer peripheral surface of the ring. The gap, however, does not extend through to the inner peripheral surface of the ring.
- FIG. 12 is a view of the plunger taken along section line 12-12 of FIG. 11 and shows the assembling of the ring segments in a seal ring groove.
- FIG. 13 is a view of the plunger taken along section line 13-13 of FIG. 11 and illustrating the assembled ring.
- the pads provide an inter-space for fluid flow between the ring and the plunger body.
- FIG. 14 is a top view of a three-piece plunger ring arranged about a section of the plunger.
- the ring segments include a non-interlocking mechanism similar to that of the two-ring segment ring assembly.
- FIG. 15 is an end view of the first ring segment taken along section line 15-15 of FIG. 14 .
- FIG. 16 is an end view of the first ring segment taken along section line 16-16 of FIG. 14 .
- FIG. 17 is an end view of the second ring segment taken along section line 17-17 of FIG. 14 .
- FIG. 18 is an end view of the second ring segment taken along section line 18-18 of FIG. 14 .
- FIG. 19 is an end view of the third ring segment taken along section line 19-19 of FIG. 14 .
- FIG. 20 is an end view of the third ring segment taken along section line 19-19 of FIG. 14 .
- FIGS. 21 to 23 illustrate the order of assembly of the three-piece plunger ring onto a plunger body.
- FIG. 24 is a view of the assembled three-piece plunger ring.
- a pressure responsive seal ring assembly 10 for use in a downhole submerged pump assembly includes two arcuate-shaped ring segments 30 and 50 configured for non-interlocking arrangement.
- Each ring segment 30 , 50 has an inner peripheral face 16 , an outer peripheral face 20 , a substantially flat lower face 22 , and an annular groove 12 located on an upper surface.
- Annular groove 12 is preferably arcuate-shaped, having a sloping inner wall portion 14 and a sloping outer wall portion 18 . See FIGS. 4-5 & 7 - 8 .
- the non-interlocking arrangement is accomplished by ring segment 30 , 50 having a first end portion 36 , 56 that lies within 180 ° of a second end portion 38 , 58 and tabs 40 , 60 , 64 that extend beyond one of the end portions 36 , 56 , 58 a sufficient distance to engage a matching recessed portion 44 , 46 , 56 located in the opposing ring segment 30 , 50 .
- Tab 40 which is located on a lower interior portion of ring segment 30 , extends past end 36 so that a distal end of tab 40 lies beyond an angular distance of 180 ° from second end 38 .
- the height of tab 40 is preferably substantially less than the height of ring segment 30 and the radius of curvature of tab 40 is preferably substantially the same as the radius of curvature for ring segment 30 . See FIG. 6 .
- the lower surface of tab 40 lies substantially co-planar to lower face 22 .
- a pad 42 is preferably provided on a portion of the inner peripheral face of tab 40 . See FIGS. 5-7 .
- the depth of pad 42 along with the depth of pads 32 and 34 , is dimensioned to provide an effective inter-space between inner face 16 and an exterior surface of the plunger (not shown) for the flow of well fluid.
- Pads 32 and 34 are preferably rectangular-shaped with the height of pads 32 and 34 preferably not extending in height equal to that of ring segment 30 .
- Lying adjacent to tab 40 is a recess 44 extending into ring segment 30 and away from end 36 .
- the bottom surface of recess 44 lies substantially co-planar to the top surface of tab 40 .
- the receiving depth of recess 44 is dimensioned to receive tab 60 of ring segment 50 .
- Tab 60 which is located on an upper interior portion of ring segment 50 , extends past end 56 so that a distal end of tab 60 lies beyond an angular distance of 180 ° from second end 58 .
- the height of tab 60 is preferably substantially greater than the height of tab 40 , with the cumulative height of tabs 40 , 60 being substantially equal to the height of each ring segment 30 , 50 .
- the radius of curvature of tab 60 is preferably substantially the same as the radius of curvature ring segment 50 . See FIG. 9 .
- the lower surface of tab 60 lies substantially parallel to lower face 22 .
- a pad 62 is preferably provided on a portion of the inner peripheral face of tab 60 . See FIGS. 5 & 8 - 9 .
- the depth of pad 62 along with the depth of pads 52 and 54 , is dimensioned to provide an effective inter-space between inner face 16 and an exterior surface of the plunger (not shown) for the flow of well fluid.
- Pads 52 and 54 are preferably dimensioned the same as pads 32 and 34 , respectively.
- Lying adjacent to tab 60 is a recess 56 extending into ring segment 50 and away from end 56 .
- the upper surface of recess 56 lies substantially co-planar to the bottom surface of tab 60 .
- the receiving depth of recess 56 is dimensioned to receive tab 40 of ring segment 30 .
- Tab 64 which is located on a lower exterior portion of ring segment 50 , extends past end 58 so that a distal end of tab 64 lies beyond an angular distance of 180 ° from first end 56 .
- the height of tab 64 is preferably substantially less than the height of ring segment 50 and the radius of curvature of tab 64 may be substantially the same as the radius of curvature for ring segment 50 . See FIG. 9 .
- the lower surface of tab 64 lies substantially co-planar to lower face 22 .
- Lying opposite tab 64 is a recess 46 located in a lower exterior portion of ring segment 30 .
- Recess 46 extends into ring segment 30 and away from end 38 .
- the bottom surface of recess 46 lies substantially co-planar to the bottom surface of tab 64 .
- the receiving depth of recess 46 is preferably substantially equal to the length of tab 64 .
- a joint face 28 normal to inner peripheral face 16 is formed as tab 64 is received by recess 46 .
- the lengths of tabs 40 and 60 and the receiving depths of recesses 44 and 56 are preferably dimensioned so that a gap 24 is formed in outer peripheral face 22 when recesses 44 and 56 fully receive tabs 60 and 40 , respectively.
- a joint face 26 is also formed.
- a tubular plunger 150 is positioned within a working barrel 152 of a downhole pump assembly (not shown).
- Plunger 150 is of a type well-known in the art and typically includes a central fluid passageway 154 and a number of seal ring flanges 160 .
- Seal ring flanges 160 have an outside diameter slightly less than the inside diameter of working barrel 152 , thereby providing a circumferential space 162 between plunger 150 and working barrel 152 .
- Located between each pair of seal ring flanges 160 is a seal ring grove 158 dimensioned to receive ring assembly 10 . Ring segments 30 and 50 are assembled in the seal ring groove 158 .
- the outside diameter of ring assembly 10 is slightly less than the inside diameter of working barrel 152 .
- Pads 32 , 34 , 42 , 52 , 54 , and 62 provide an inter-space between the inner peripheral face 16 of ring segments 30 and 50 and plunger wall 156 .
- annular groove 12 , gap 24 , and pads 32 , 34 , 42 , 52 , 54 , and 62 facilitate this expansion and improve surface contact of outer peripheral surface 20 with working barrel 152 .
- a decrease in fluid pressure causes ring segments 30 and 50 to retract radially inward. The pump cycle then repeats. Ring segments 30 and 50 remain connected to one another throughout the pump cycle in a non-locking manner and resist fluid flow therebetween.
- ring assembly 10 includes three ring segments 80 , 100 , and 120 that assemble in a non-locking manner similar to that of ring segments 30 and 50 .
- Ring segments 80 and 120 each have a first end portion 86 , 126 that lies within 60 ° angular distance of a second end portion 88 , 128 , respectively.
- Ring segment 100 has a first end portion 106 and a second end portion 108 that lie substantially 120 ° apart of one other.
- Tab 90 which is located on a lower interior portion of ring segment 80 , extends past end 86 so that a distal end of tab 90 lies beyond an angular distance of 120 ° from second end 88 .
- the height of tab 90 is preferably substantially less than the height of ring segment 80 and the radius of curvature of tab 90 is preferably substantially the same as the radius of curvature for inner peripheral face 16 .
- the lower surface of tab 90 lies substantially co-planar to lower face 22 .
- a pad 92 is preferably provided on a portion of the inner peripheral face of tab 90 .
- the depth of pad 92 along with the depth of pads 82 and 84 , is dimensioned to provide an effective inter-space between inner face 16 and plunger wall 156 for the flow of well fluid.
- Pads 82 and 84 are preferably rectangular-shaped and the height of pads 82 and 84 preferably not extending in height equal to that of ring segment 30 .
- Lying adjacent to tab 90 is a recess 96 extending into ring segment 80 and away from end 86 .
- the bottom surface of recess 96 lies substantially co-planar to the top surface of tab 90 .
- the receiving depth of recess 96 is dimensioned to receive tab 130 of ring segment 120 .
- Tab 130 which is located on an upper interior portion of ring segment 120 , extends past end 126 so that a distal end of tab 130 lies beyond an angular distance of 120 ° from second end 88 .
- the height of tab 60 is preferably substantially greater than the height of tab 90 , with the cumulative height of tabs 90 and 130 being substantially equal to the height of ring segments 90 and 120 .
- the radius of curvature of tab 130 is preferably substantially the same as the radius of curvature ring segment 120 .
- the lower surface of tab 130 lies substantially parallel to lower face 22 .
- a pad 134 is preferably provided on a portion of the inner peripheral face of tab 130 .
- the depth of pad 134 along with the depth of pads 122 and 124 , is dimensioned to provide an effective inter-space between inner face 16 and plunger wall 156 for the flow of well fluid.
- Pads 122 and 124 are preferably dimensioned the same as pads 82 and 84 , respectively.
- a recess 136 Lying adjacent to tab 130 is a recess 136 extending into ring segment 120 and away from end 126 .
- the upper surface of recess 136 lies substantially co-planar to the bottom surface of tab 130 .
- the receiving depth of recess 136 is dimensioned to receive tab 90 of ring segment 80 .
- Tab 132 which is located on a lower exterior portion of ring segment 120 , extends past end 128 so that a distal end of tab 132 lies beyond an angular distance of 120 ° from first end 126 .
- the height of tab 132 is preferably substantially less than the height of ring segment 120 and the radius of curvature of tab 132 may be substantially the same as the radius of curvature for ring segment 120 .
- the lower surface of tab 132 lies substantially co-planar to lower face 22 .
- Lying opposite tab 132 is a recess 114 located in a lower exterior portion of ring segment 100 .
- Recess 114 extends into ring segment 100 and away from end 108 .
- the bottom surface of recess 14 lies substantially co-planar to the bottom surface of tab 132 .
- the receiving depth of recess 114 is substantially equal to the length of tab 132 .
- Substantially similar to tab 132 is a tab 110 extending from end 106 .
- Substantially similar to recess 114 is a recess 94 located in a lower exterior portion of ring segment 80 .
- Ring segment 100 also includes pads 102 , 104 , and 112 .
- Pads 102 and 104 are substantially similar to pads 82 and 122 .
- Pad 112 is substantially similar to pads 84 and 124 .
- a joint face 28 normal to inner peripheral face 16 is formed as tab 110 is received by recess 94 and tab 132 is received by recess 114 .
- the lengths of tabs 90 and 130 and the receiving depths of recesses 96 and 136 are preferably dimensioned so that a gap 24 is formed in outer peripheral face 22 when recesses 96 and 136 fully receive tabs 130 and 90 , respectively.
- a joint face 26 is also formed. Ring segments 90 , 100 , and 120 operate in a substantially similar way as ring segments 30 and 50 .
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Abstract
Description
- This application is not based upon any pending domestic or international patent applications.
- This invention relates to improvements in oil well pumps and more particularly to seal rings used in reciprocating subsurface oil well pump assemblies.
- A typical reciprocating subsurface oil well pump consists of a plunger and travelling check valve in reciprocating relationship within a stationary working barrel formed as a part of the oil well production tubing. The working barrel itself is provided with a standing valve and submerged usually in well fluid. The pump is normally secured to the lowermost end of a sucker rod string, which extends longitudinally through production tubing situated in the well bore. A reciprocating device at the surface, either a traditional “horsehead” type or more recent wire line winch, alternately raises and lowers the string of sucker rods in the well bore.
- The wire line winch system typically includes a control means for rotating the winch in one direction for the upstroke and controllably releasing the winch in the reverse direction for the downstroke. In such a system a weighted oil well plunger-type pump must be capable, during the upstroke, of providing adequate ring seals for producing the fluid, while on the downstroke, the seal rings must be capable of permitting substantial release of the plunger so that it will fall to its bottom dead center position for the repeat of the process.
- Plungers have been provided with various means for affecting the necessary fluid seal between the plunger and the working barrel. For example, U.S. Pat. No. 3,953,155 discloses a single-piece pressure responsive plunger ring arranged between adjacent spacers and shaped so as to expand radially in contact with the working barrel by action of the fluid being pumped. The ring has an annular groove in its upper surface that is tapered outwardly toward the outer face of the ring. The outer face of the ring is then tapered downwardly and inwardly to form a lip around the outer edge. During the upward stroke of the pump, an increase in fluid pressure causes the ring to expand and provide a seal with respect to the working barrel. The ring also has a gap to facilitate assembly onto the plunger and to facilitate radial expansion and contraction of the ring. As the ring wears through use, and as sand and other abrasive particles embed into the ring, pumping efficiency degrades and the ring must be pulled and replaced, causing downtime on the well and additional repair expense.
- Various attempts to provide improved sealing and wear-resistance of plunger rings involve protecting the ring from abrasive particles, changing the ring's material composition, and providing expansion and retraction capabilities. For example, U.S. Pat. No. 5,752,814 discloses use of a plastic sleeve positioned above and below the ring to effect embedment of sand and other abrasive particles in the plastic and protect the ring. To thermally stabilize the sleeves and prevent their expansion due to pumping friction and elevated formation temperatures, a stainless steel or brass insert must be provided, further increasing the cost of the plunger assembly. U.S. Pat. No. 5,372488 discloses a ring composed of metal and having two or more interlocking semi-cylindrical flat ring segments. To provide greater contact potential with the working barrel, the outer face of the ring is not tapered. Similar to the operation of the U.S. Pat. No. 3,953,155, during the upward stroke of the plunger, an increase in fluid pressure causes the ring segments to expand outwardly and provide a seal with respect to the working barrel. During the downward stroke, a decrease in fluid pressure causes the ring segments to retract.
- The interlocking ring arrangement, however, has significant disadvantages. Similar to the single-piece rings, the interlocking ring segments provide no consistent inter-space between the backside of the ring and the plunger when the ring segments are in their collapsed position, thereby requiring greater pressure for expansion during the upstroke and producing inconsistency in sealing efficiency between strokes. Because of the interlocking arrangement, a gap cannot be provided to facilitate radial expansion and contraction of the ring and allow for fluid flow to the backside of the ring. Rather, openings must be provided in the seal ring groove portion of the plunger in order for the groove to communicate with an interior flow channel and thereby allow fluid to reach the backside of the ring. In addition, reliefs located on the outer edge of the ring segment and opposite each interlock must be provided to prevent interference with the top and bottom sides of the groove when the ring segments are expanded. Sand and other foreign particles in the well fluid can cause misalignment of the interlocks and interfere with the ring segments' ability to properly expand and retract during operation, potentially increasing drag on the downward stroke and causing damage to the working parts of the pump. Therefore, a need exists for an improved, multi-piece plunger ring.
- A pressure responsive seal ring assembly for use in a downhole submerged pump assembly includes a plunger with a metallic cylinder and at least one seal ring groove in the cylinder for receiving a seal ring. The seal ring has two arcuate-shaped ring segments that interconnect in a non-locking manner. Each of the ring segments has a first and second end having an angular distance therebetween of less than 180°. A first tab extends beyond the first end of each ring segment and is received by a recessed portion in the first end of the opposing ring segment. A second tab extends beyond the second end of the second ring segment and is received by a recessed portion in the second end of the first ring segment. Under pressure the ring segments expand radially outward and resist fluid flow therebetween.
- In a preferred embodiment, the seal ring includes a raised pad located on a portion of an inner peripheral surface of the ring segments. The pad provides an effective inter-space for a fluid flow between the inner peripheral surface of the ring and the plunger body. A pad is also preferably provided on the inner peripheral surface of the first tab.
- The tabs and recessed portions are preferably dimensioned so that a gap in an outer periphery of the seal ring is formed when the ring is in its retracted position. The outside diameter of the seal ring in its retracted position is slightly less than an inside diameter of the working barrel in communication with the plunger. The gap, however, does not extend through to the inner peripheral surface of the ring. The seal ring also preferably has an annular groove in the upper surface of each of ring segment.
- In another preferred embodiment, the seal ring includes three arcuate-shaped ring segments. The ring segments include a tab-and-recess combination that interconnect in a non-locking manner similar to that of the two-ring segment ring assembly.
- A better understanding of the invention will be obtained from the following detailed description of the preferred embodiments taken in conjunction with the drawings and the attached claims.
-
FIG. 1 is an isometric view of a plunger ring having two arcuate-shaped ring segments that interconnect in a non-locking manner. A tab extension on each ring segment is received by an opposing recess in the other ring segment. -
FIG. 2 is an isometric view of the plunger ring in its assembled state. -
FIG. 3 is a top view of the assembled plunger ring. A number of pads located on the inner periphery of the ring provide an inter-space for fluid flow between the ring and a plunger body. -
FIG. 4 is a cross-sectional view of the plunger ring taken along section line 4-4 ofFIG. 3 . An annular groove is provided on the upper surface of the ring segment to facilitate expansion and retraction of the ring segments. -
FIG. 5 is a cross-sectional view of the plunger ring taken along section line 5-5 ofFIG. 3 . Each tab extension is received by a recess in the opposing ring segment and a joint between the mated but not interlocked ring segments is formed. -
FIG. 6 is a top view of the first arcuate-shaped ring segment. The ring segment includes a tab extension and recessed portion on one end and a second recessed portion on the other end. -
FIG. 7 is a front view of the first ring segment. -
FIG. 8 is a front view of the second arcuate-shaped ring segment. The ring segment includes a tab extension at each end. A recessed portion on one end receives the tab extension of the first ring segment. -
FIG. 9 is a top view of the second ring segment. - {719894;} 6
-
FIG. 10 is a front view of a tubular plunger having a number of seal ring flanges. Seal ring grooves located between the seal ring flanges each receive the first and second ring segment. -
FIG. 11 is an isometric view of the plunger illustrating the assembling of the ring segments onto the plunger. The assembled ring segment provides a gap in the outer peripheral surface of the ring. The gap, however, does not extend through to the inner peripheral surface of the ring. -
FIG. 12 is a view of the plunger taken along section line 12-12 ofFIG. 11 and shows the assembling of the ring segments in a seal ring groove. -
FIG. 13 is a view of the plunger taken along section line 13-13 ofFIG. 11 and illustrating the assembled ring. The pads provide an inter-space for fluid flow between the ring and the plunger body. -
FIG. 14 is a top view of a three-piece plunger ring arranged about a section of the plunger. The ring segments include a non-interlocking mechanism similar to that of the two-ring segment ring assembly. -
FIG. 15 is an end view of the first ring segment taken along section line 15-15 ofFIG. 14 . -
FIG. 16 is an end view of the first ring segment taken along section line 16-16 ofFIG. 14 . -
FIG. 17 is an end view of the second ring segment taken along section line 17-17 ofFIG. 14 . -
FIG. 18 is an end view of the second ring segment taken along section line 18-18 ofFIG. 14 . -
FIG. 19 is an end view of the third ring segment taken along section line 19-19 ofFIG. 14 . -
FIG. 20 is an end view of the third ring segment taken along section line 19-19 ofFIG. 14 . -
FIGS. 21 to 23 illustrate the order of assembly of the three-piece plunger ring onto a plunger body. -
FIG. 24 is a view of the assembled three-piece plunger ring. - The description that follows presents preferred embodiments for the purpose of exemplification. Elements shown by the drawings are identified by the following numbers:
-
10 Plunger ring 52 Pad 108 Second end assembly 54 Pad 110 Extension 12 Annular groove 56 First end 112 Pad 14 Inner side wall 58 Second end 114 Recess 16 Inner face 60 Extension 120 Ring segment 18 Outer wall 62 Pad 122 Pad 20 Outer face 64 Extension 124 Pad 22 Lower face 66 Recess 126 First end 24 Gap 80 Ring segment 128 Second end 26 Joint 82 Pad 130 Extension 28 Joint 84 Pad 132 Extension 30 Ring segment 86 First end 134 Pad 32 Pad 88 Second end 136 Recess 34 Pad 90 Extension 150 Tubular plunger 36 First end 92 Pad 152 Working barrel 38 Second end 94 Recess 154 Central opening 40 Extension 96 Recess 156 Wall 42 Pad 100 Ring segment 158 Ring groove 44 Recess 102 Pad 160 Spacer flange 46 Recess 104 Pad 162 Circumferential 50 Ring segment 106 First end space 164 Inter-space - Referring to the drawings and first to
FIGS. 1 to 3 , a pressure responsiveseal ring assembly 10 for use in a downhole submerged pump assembly includes two arcuate-shapedring segments ring segment peripheral face 16, an outerperipheral face 20, a substantially flatlower face 22, and anannular groove 12 located on an upper surface.Annular groove 12 is preferably arcuate-shaped, having a slopinginner wall portion 14 and a slopingouter wall portion 18. SeeFIGS. 4-5 & 7-8. In a preferred embodiment, the non-interlocking arrangement is accomplished byring segment first end portion second end portion tabs end portions portion ring segment -
Tab 40, which is located on a lower interior portion ofring segment 30, extendspast end 36 so that a distal end oftab 40 lies beyond an angular distance of 180° fromsecond end 38. The height oftab 40 is preferably substantially less than the height ofring segment 30 and the radius of curvature oftab 40 is preferably substantially the same as the radius of curvature forring segment 30. SeeFIG. 6 . The lower surface oftab 40 lies substantially co-planar tolower face 22. - A
pad 42 is preferably provided on a portion of the inner peripheral face oftab 40. SeeFIGS. 5-7 . The depth ofpad 42, along with the depth ofpads inner face 16 and an exterior surface of the plunger (not shown) for the flow of well fluid.Pads pads ring segment 30. - Lying adjacent to
tab 40 is arecess 44 extending intoring segment 30 and away fromend 36. The bottom surface ofrecess 44 lies substantially co-planar to the top surface oftab 40. The receiving depth ofrecess 44 is dimensioned to receivetab 60 ofring segment 50. -
Tab 60, which is located on an upper interior portion ofring segment 50, extendspast end 56 so that a distal end oftab 60 lies beyond an angular distance of 180° fromsecond end 58. The height oftab 60 is preferably substantially greater than the height oftab 40, with the cumulative height oftabs ring segment tab 60 is preferably substantially the same as the radius ofcurvature ring segment 50. SeeFIG. 9 . The lower surface oftab 60 lies substantially parallel tolower face 22. - A
pad 62 is preferably provided on a portion of the inner peripheral face oftab 60. See FIGS. 5 & 8-9. The depth ofpad 62, along with the depth ofpads inner face 16 and an exterior surface of the plunger (not shown) for the flow of well fluid.Pads pads - Lying adjacent to
tab 60 is arecess 56 extending intoring segment 50 and away fromend 56. The upper surface ofrecess 56 lies substantially co-planar to the bottom surface oftab 60. The receiving depth ofrecess 56 is dimensioned to receivetab 40 ofring segment 30. -
Tab 64, which is located on a lower exterior portion ofring segment 50, extendspast end 58 so that a distal end oftab 64 lies beyond an angular distance of 180° fromfirst end 56. The height oftab 64 is preferably substantially less than the height ofring segment 50 and the radius of curvature oftab 64 may be substantially the same as the radius of curvature forring segment 50. SeeFIG. 9 . The lower surface oftab 64 lies substantially co-planar tolower face 22. - Lying opposite
tab 64 is arecess 46 located in a lower exterior portion ofring segment 30.Recess 46 extends intoring segment 30 and away fromend 38. The bottom surface ofrecess 46 lies substantially co-planar to the bottom surface oftab 64. The receiving depth ofrecess 46 is preferably substantially equal to the length oftab 64. - When
ring segments joint face 28 normal to innerperipheral face 16 is formed astab 64 is received byrecess 46. The lengths oftabs recesses gap 24 is formed in outerperipheral face 22 when recesses 44 and 56 fully receivetabs joint face 26 is also formed. - Turning now to
FIGS. 11 to 13 , atubular plunger 150 is positioned within a workingbarrel 152 of a downhole pump assembly (not shown).Plunger 150 is of a type well-known in the art and typically includes acentral fluid passageway 154 and a number ofseal ring flanges 160.Seal ring flanges 160 have an outside diameter slightly less than the inside diameter of workingbarrel 152, thereby providing acircumferential space 162 betweenplunger 150 and workingbarrel 152. Located between each pair ofseal ring flanges 160 is aseal ring grove 158 dimensioned to receivering assembly 10.Ring segments seal ring groove 158. In a collapsed state, the outside diameter ofring assembly 10 is slightly less than the inside diameter of workingbarrel 152.Pads peripheral face 16 ofring segments plunger wall 156. - During the upward stroke of the pump (not shown), an increase in fluid pressure causes
ring segments barrel 152.Annular groove 12,gap 24, andpads peripheral surface 20 with workingbarrel 152. During the downward stroke, a decrease in fluid pressure causesring segments Ring segments - Referring now to
FIGS. 14 to 20 , in another preferredembodiment ring assembly 10 includes threering segments ring segments Ring segments first end portion second end portion Ring segment 100 has afirst end portion 106 and asecond end portion 108 that lie substantially 120° apart of one other. -
Tab 90, which is located on a lower interior portion ofring segment 80, extendspast end 86 so that a distal end oftab 90 lies beyond an angular distance of 120° fromsecond end 88. The height oftab 90 is preferably substantially less than the height ofring segment 80 and the radius of curvature oftab 90 is preferably substantially the same as the radius of curvature for innerperipheral face 16. The lower surface oftab 90 lies substantially co-planar tolower face 22. - A
pad 92 is preferably provided on a portion of the inner peripheral face oftab 90. The depth ofpad 92, along with the depth ofpads inner face 16 andplunger wall 156 for the flow of well fluid.Pads pads ring segment 30. - Lying adjacent to
tab 90 is arecess 96 extending intoring segment 80 and away fromend 86. The bottom surface ofrecess 96 lies substantially co-planar to the top surface oftab 90. The receiving depth ofrecess 96 is dimensioned to receivetab 130 ofring segment 120. -
Tab 130, which is located on an upper interior portion ofring segment 120, extendspast end 126 so that a distal end oftab 130 lies beyond an angular distance of 120° fromsecond end 88. The height oftab 60 is preferably substantially greater than the height oftab 90, with the cumulative height oftabs ring segments tab 130 is preferably substantially the same as the radius ofcurvature ring segment 120. The lower surface oftab 130 lies substantially parallel tolower face 22. - A
pad 134 is preferably provided on a portion of the inner peripheral face oftab 130. The depth ofpad 134, along with the depth ofpads inner face 16 andplunger wall 156 for the flow of well fluid.Pads pads - Lying adjacent to
tab 130 is arecess 136 extending intoring segment 120 and away fromend 126. The upper surface ofrecess 136 lies substantially co-planar to the bottom surface oftab 130. The receiving depth ofrecess 136 is dimensioned to receivetab 90 ofring segment 80. -
Tab 132, which is located on a lower exterior portion ofring segment 120, extendspast end 128 so that a distal end oftab 132 lies beyond an angular distance of 120° fromfirst end 126. The height oftab 132 is preferably substantially less than the height ofring segment 120 and the radius of curvature oftab 132 may be substantially the same as the radius of curvature forring segment 120. The lower surface oftab 132 lies substantially co-planar tolower face 22. - Lying opposite
tab 132 is arecess 114 located in a lower exterior portion ofring segment 100.Recess 114 extends intoring segment 100 and away fromend 108. The bottom surface ofrecess 14 lies substantially co-planar to the bottom surface oftab 132. The receiving depth ofrecess 114 is substantially equal to the length oftab 132. Substantially similar totab 132 is atab 110 extending fromend 106. Substantially similar torecess 114 is arecess 94 located in a lower exterior portion ofring segment 80.Ring segment 100 also includespads Pads pads Pad 112 is substantially similar topads - When
ring segments joint face 28 normal to innerperipheral face 16 is formed astab 110 is received byrecess 94 andtab 132 is received byrecess 114. The lengths oftabs recesses gap 24 is formed in outerperipheral face 22 when recesses 96 and 136 fully receivetabs joint face 26 is also formed.Ring segments ring segments - While the invention has been described with a certain degree of particularity, many changes may be made in the details of construction and the arrangement of components without departing from the spirit and scope of this disclosure. The invention, therefore, is to be limited only by the scope of the attached claims, including the full range of equivalency to which each element thereof is entitled.
Claims (16)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/575,211 US20110079960A1 (en) | 2009-10-07 | 2009-10-07 | Multi-Piece Pressure Operated Rings for a Downhole Pump Plunger |
CA2716685A CA2716685A1 (en) | 2009-10-07 | 2010-10-07 | Multi-piece pressure operated rings for a downhole pump plunger |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US12/575,211 US20110079960A1 (en) | 2009-10-07 | 2009-10-07 | Multi-Piece Pressure Operated Rings for a Downhole Pump Plunger |
Publications (1)
Publication Number | Publication Date |
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US20110079960A1 true US20110079960A1 (en) | 2011-04-07 |
Family
ID=43822600
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/575,211 Abandoned US20110079960A1 (en) | 2009-10-07 | 2009-10-07 | Multi-Piece Pressure Operated Rings for a Downhole Pump Plunger |
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US (1) | US20110079960A1 (en) |
CA (1) | CA2716685A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015104465A1 (en) * | 2014-01-08 | 2015-07-16 | Maxoil | Hydrocarbon extraction pump with an improved plunger |
US20150275633A1 (en) * | 2014-03-26 | 2015-10-01 | Randy C. Tolman | Selectively Actuated Plungers and Systems and Methods Including the Same |
US9957782B1 (en) * | 2016-12-13 | 2018-05-01 | Michael Brent Ford | Screen filter assembly and method therefor |
US10577902B2 (en) | 2015-10-14 | 2020-03-03 | Fourth Dimension Designs Ltd. | Downhole plunger with spring-biased pads |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2669723C1 (en) * | 2018-01-10 | 2018-10-15 | Пётр Олегович Александров | Oil well pump |
CN108980018A (en) * | 2018-07-26 | 2018-12-11 | 中国石油天然气股份有限公司 | A kind of soft seal flexibility pump plunger and barrel pump |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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US9957782B1 (en) * | 2016-12-13 | 2018-05-01 | Michael Brent Ford | Screen filter assembly and method therefor |
Also Published As
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CA2716685A1 (en) | 2011-04-07 |
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Owner name: WEATHERFORD ARTIFICIAL SYSTEMS, INC., TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BORDEN, B. MICHAEL;REEL/FRAME:027496/0009 Effective date: 20111206 Owner name: WEATHERFORD ARTIFICIAL LIFT SYSTEMS, INC., TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BORDEN, B. MICHAEL;REEL/FRAME:027496/0009 Effective date: 20111206 |
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