CA1189549A - Two step packing gland - Google Patents
Two step packing glandInfo
- Publication number
- CA1189549A CA1189549A CA000399289A CA399289A CA1189549A CA 1189549 A CA1189549 A CA 1189549A CA 000399289 A CA000399289 A CA 000399289A CA 399289 A CA399289 A CA 399289A CA 1189549 A CA1189549 A CA 1189549A
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- CA
- Canada
- Prior art keywords
- housing
- bore
- sleeve
- packing
- disposed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
ABSTRACT OF DISCLOSURE
Disclosed is an improved sucker rod packing gland for oil well pumps. The improved packing gland has two packing sections, a lower section and an upper section with a reservoir disposed between them. Oil which leaks through the lower packing section is contained in the reservoir between upper packing section and drained from the reservoir by a return line which delivers it back to the well.
Delivery of the oil collected in the reservoir through the return line is accomplished by a pressure differential built up in the reservoir by reason of the two packing stages and the gravity flow continues on the return line.
Disclosed is an improved sucker rod packing gland for oil well pumps. The improved packing gland has two packing sections, a lower section and an upper section with a reservoir disposed between them. Oil which leaks through the lower packing section is contained in the reservoir between upper packing section and drained from the reservoir by a return line which delivers it back to the well.
Delivery of the oil collected in the reservoir through the return line is accomplished by a pressure differential built up in the reservoir by reason of the two packing stages and the gravity flow continues on the return line.
Description
ABSTR~CT OF DI SCLOSURE
. Disclosed is an improved sucker rod packing gland for oil well pumpsO The improved packing gland has two packing sections, a lower section and an upper section with a reservoir disposed between them. Oil which leaks through the lower packing section is containec S in the reservoir between upper packing section and drained from the ¦ reservoi~ by a return line which delivers it back to the well.
Delivery of the oil collected in the reservoir through the return line is accomplished by a pressure differential built up in the ¦ reservoir by reason of the ~wo packin~ stages and t~e gravity flow continues on the return line~
. I . I
.
TWO STEP PACKING GLAND
Background of the Invention This invention relates generally to packing glands for oil well pumps and more par-ticularly to improvements to such glands to prevent the leaking oE oil therefrom.
In the typical oil well pump, a sucker rod extends down into the well pipe and is reciprocated in the well pipe to draw out the oil. The sucker rod is driven by a counterweighted arm pivoted by a drive motor. The sucker rod is connected to the arm by a polish rod which passes into -the well pipe through a packing gland. At the top of the well, just under the packing gland, is a Tee which connects the well pipe to a discharge line that carries the output of the well to a collecting point or sump. According to older techniques the oil discharge lines were under relatively low pressure because the sumps were open.
Now, due to environmental protection requirements, energy conservation, and other factors, many discharge oil lines feed closed sumps or other storage facilities and must , ~
dellver the oil under substantial pressures.
Furthermore, many wells are now being inj~cted with steam to increase their productivity. This not only makes the oil less viscous, but it frequently causes -the oil to be delivered to the surface under substantial pressure.
Even before the conditions of increased discharge line pressures occurred, leaking in sucker rod packing glands was a problem. Not only was valuable oil being wasted and a messy condition being created around most well heads, but continuous maintenance was re~uired to minimize the leaking. Now that increased pressures are being created in discharge lines, and the conservation of oil and avoidance of bad environmental conditions are important considerations, this problem has been greatly accentuated.
Prior to my invention, various improvements were attempted to minimize packing gland leaks. In general, these were dir-ected toward providing a tighter seal between the gland packing and the polish rod. Since the polish rod musl continuously reciprocate in the gland, however, this approach results in faster wearout of the packing in the packing gland and increased drive motor load because of the friction between the polish rod and the packing.
In my patent 3,985,466 issued October 12, 1976, I des-cribed a Packing Gland Leak Retriever Device which undertakes to solve the leakage problem by providing a leak collector pan about the packing gland with a plunger pump which is driven by a head or platen on the sucker rod. The pump is actuated on each cycle of the sucker rod and delivers oil collected by the pan into the well discharge line through a pair of check valves.
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:~`l'' ..
: , .... .
Field experience with this device indicated certain limitations in its use, and has lead to the present invention. One problem with my prior invention is the risk of injury to oil field personnell in case they insert a hand or some other body part between the pump plunger and the head on the sucker rod while the sucker rod is reciprocating. Avoidance of this hazard has required the placement of a screen or shield about the sucker rod at the movement area of the head, which results in inconvenience when the packing gland is disassembled to replace the pa~king.
Moreover, my present invention is considerably simpler mechan-ically than my prior invention because I have been able to achieve an equivalent result without the need of a plunger pump.
An object of the present invention is to obviate or mitigate the above disadvantages.
~ccording to the present invention there is provided an oil well packing gland comprising:
a sleeve interconnectable with an oil well pipe h~ving lower threads and upper threads, the sleeve having a bore substantially greater than the diameter of a polish rod;
a sleeve flange in the lower portion of the sleeve extend-ing radially inward in the bore thereof, the sleeve flange being disposed normal to the longitudinal axis of the sleeve to support donut-shaped packing elements of the type commonly used in oil well packing thereabove when the packing elements are inserted in the sleeve bore, the sleeve flange having an internal bore greater than the outer diameter of the polish rod and disposed to pass the polish rod therethrough;
a housing having a centrally disposed vertical bore there-through of a size and shape to contain a plurality of donut-shaped packing elements of the type commonly used, wherein lower housing - 3' ~
. ~
threads are in a lower portion of the housing disposed for threaded engagement with the upper threads on the sleeve ~o assemble the housing on the sleeve;
a housing flange in the lower portion of the houslng bore and extending radially inward normal to the axis of the housing ~ore and having a central bore therein larger than the diameter of the polish rod, the housing flange being disposed to support a plurality of packing elements in the housing ~ore;
means defining a reservoir in the housing;
a drain outlet interconnected with the reservoir for draining fluid from the reservoir; and ~ap means on an upper portion of the housing.
Also in accordance with the invention there is provided a packing gland for sealing well head piping to a reciprocating polish rod comprising:
a housing having a longitudinal bore in an upper end thereof, the bore having a diameter of sufficient size and shape to accommodate an annular packing ring member;
a housing flange formed in the bottom of the housing bore and having an inner diameter of sufficient size and shape to freely pass the polish rod therethrough, the housing flange being disposed to seat and support such a packing member in the upper bore;
means defining a reservoir in the housing in fluid inter~connection with the housing bore below the top surface of the housing flange, the reservoir having an outlet for dispensing fluid therefrom through the wall of the housing; and threads in a lower portion of the housing below the reservoir said lower housing portion having a bore therein of sufficient size to freely pass said polish rod, the threads provided for engagement - 3a -.~ .`
o~ a packing sleeve of the type commonly ~sed on oil wells to thereby connect the packing sleeve to the housing, Further in accordance with the invention there is provided an oil well packing glad comprising:
a sleeve interconnectable with an oil well pipe compriqing:
threads in an upper portion of the sleeve;
a centrally disposed vertical bore through the sleeve of a size substantially greater than the diameter of a polish rod;
a sleeve flange in a lower portion of the sleeve that extends radially into the sleeve bore and is disposed normal to the longitudinal axis of the sleeve to thereby support donut-shaped packing elements when such packing elements are inserted into the sleeve bore, the sleeve flange having an internal diamater greater than the outer diameter of the polish rod and disposed to pass the polish rod therethrough;
a housing interconnectable with the sleeve comprising:
a centrally disposed vertical bore therethrough having a size and shape for containing one or more donut-shaped packing elements;
threads in a lower portion of the housing disposed ~or threaded engagement with the threads in the upper portion of the sleeve to thereby assemble the housing on the sleeve;
a flange in a lower portion of the housing that extends radially into the housing bore and is disposed normal to the longitudinal axis of the housing to thereby support donut-shaped packing elements when such packing elements are inserted into the housing,bore, the flange having an - 3b internal diameter larger t~an the diameter of the polish rod and disposed to pass the polish rod therethxough;
means de~ining a reservoir in the housing, wherein the reservoir is in fluid communication with the housing bore at a point below the top of the ho~sing flange;
a drair. outlet in fluid communication with the reservoir for draining fluid from the reservolr;
threads in an upper portion of the housing; and a cap having threads disposed for threaded engagement with the threads in the upper portion of the housing to thereby secure the cap on the hoùsing.
These and other objects and advantages of my invention will become more readily apparent from the following detailed description of a preferred embodiment, and the accompanying drawinys, in which FIG. 1 is a perspective view of an oil well sucker rod and horse's head with my sucker rod packing gland installed;
Fig. 2 is an enlarged perspective view of my sucker rod packing gland in îts preferred embodiment form;
Fig. 3 is a sectional view taken on 3-3 in Fig. 2;
Fig. 4 is a sectional view taken on 4-4 in Fig. 3.
Referring now to the drawings, the numeral 10 designates gene~ally., the preferred embodiment of my invention. The sucker rod packing gland 10 is shown mounted in alignment with a polish rod 12 disposed , . ., ~
;; - 4 ~
inside of a well pipe 14. The well pipe 14 extends above the w~ll head 16 at yround level and a discharge tee 18 which connects to the pipe rising up from the well head 16 and supplies a discharge pipe 20 that carries oil lifted from the well to a storage facility.
The polish rod 12 is raised and lowered in a well pipe 14 by a rocking horse's head 22 which is connected to the polish rod by a connecting rod 24. All this is in accordance with the usual and well known pumping procedures for oil wells.
Referring now particularly to Figs. 2 and 3, the packing gland 10 has a housing body 28 which is mounted on top of an upstanding sleeve 30, extending upwardly from the tee 18. The sleeve 30 has lower threads (not shown) by which it is connected to the tee 18. The sleeve has a bore substantially greater than the diameter o~ the polish rod 12 and is of the type commonly used for mounting packing glands. A sleeve flange (not shown) extends radially inwardly in the sleeve bore at the bottom of the sleeve and is disposed normal to the longitud-inal axis of the sleeve. The flange has an internal bore greater than the outer diameter of the polish rod 12 and includes a seat which supports lower packing 32, of the usual donut-shaped type, in the sleeve.
The housing body 28 has a reservoir 34 defined centrally about the extension of the housing 28 and has female taperea threads 36 in the lower end and standard male threads 38 in ~_ 5 .. . .
. .
the upper end. The lower end threads 36 match the tapered threads 40 in the upper end of the sleeve 30.
In the upper end of the housing 28, a cylindrical opening chamber 42 i9 provided and a shoulder or flange 43 is in the housing at its lower end. The flange 43 extends radially inwardly normal to the axis of the housing bore and has a central bore therein that is larger than the diameter of the polish rod 12. The cylindrical chamber 42 is substant~
ially larger than the polish rod 12 and of an appropriate size to snugly contain standard elements of upper packing 44 of doughnut-shape which are similar to the lower - 5a packing 32 but are mounted in the upper packing area of chamber 42. ~ doughnut-shaped base ring 46 is disposed in the lower portion of the chamber 42 on the top surface of the flange or shoulder 43 to support the upper packing elements 44 in the chamber 4~, and a similar base ring (not shown) is utilized to support the lower packing 32 contained by sleeve 30. An upper chaser 48 is mounted in the upper portion of the chamber 42 on top o~ the upper packing elements 44. The upper chaser 48 has a greater axial width than thP remaining height o~ the chamber 42 so that it extends above the chamber and it is formed of brass and is doughnut-shaped so that it accommodates the polish rod 12 through its center. The upper chaser 48 sets on top of the upper packing elements 44 to hold the packing elements in place. A
cap 50 is threadedly engaged with the male threads 38 at the top of the housing 28 by means of female matching threads 52. When the cap 50 is threaded onto the upper portion of the housing 28 on threads 38 by means of the matching threads 52, the central portion of the cap i.e. the cap land engages the upper chaser 4S
and presses the upper chaser down upon the upper packing elements 44 to compress the packing elements against the base ring 46 and thus, against the top surface of the shoulder 43 and force them inwardly around the polish rod 12, all in a manner well known in the art. The housing 28 has a lower port 54 which is connected to and disposed at the same level as the bottom of the reservoir 34 and an upper port 56 which is disposed at the top portion of the reservoir 34 higher than the lower port 54. Each of these ports is tapped for threads and can be plugged or connected to a drain hose.
In actual use, the upper port 56 is connected to a drain hose 58 which passes back down through the well head 16 into the well and drains, from the reservoir 34, the oil accumulated therein by ~.
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! 6 "' '.
, leakage pa~t the lower packing in sleeve 30. The lower port 54 is normally closed with a plug that can be opened for purposes of draining the reservoir 34 portion o:E the housing 28 for cleaning.
The cap 50 has a pair oE ears 60 to assist in the tighten-ing down or loosening of the cap in a manner well known in theoil field art.
The lower packing gland 30 has a lower packing gland chaser or land means 62 which rides on top of the lower packing 32 and is pressed into the packing by means of a lower chaser flange 64 i.e. ~he bottom surface of the shoulder or flange 43, when the housing 28 is threaded onto the sleeve 30.
As best shown in Fig. 4, the reservoir 34 has a central portion 66 disposed about the polish rod 12 below the upper packing elements 44 and a generally cylindrical outer reservoir portion 68 which extends upwardly in the housing 28 from the central portion 66 and is spaced outwardly from the chamber 42.
Cross holes 70 interconnect the central portions 66 of the reservoir 34 with the outer reservoir 68 at quadrants about the longitudinal axis of the housing 28.
OPERATION
In operation, my device functions substantially as follows.
I~hen the well pump is placed in operation, the polish rod 12 reciprocates inside the packing gland 10. The lower packing 32 in the sleeve 30 is held in position by a lower base ring similar to upper base ring 46 and the lower packing gland chaser 62.
The lower packing gland chaser 62 is preseed down upon the lower packing 32 in the sleeve 30 by the lower chaser flange 64 ,~, by threading of the sleeve 30 into the lower end o~ the housing 28 utilizing threads 36 and 40. The lower packing gland chaser 62 in the lower packing portion of sleeve 30 extends above the top of the sleeve to give a surface for engaging the lower cha~er flange 64 of the housing 28.
The pressure thereby placed on the packing 32 squeezes the lower packing 32 onto the polish rod 12 in the lower packing area of sleeve 30, to an extent that depends upon the degree to which the housing 28 is tightened down into the top of the sleeve 30.
In a proper installation this tightening will be less than is normally utilized with a single packing gland in order to permit a small degree of leakage through the bottom packing area. This leakage will be collected in the reservoir 34 and when it rises in the outer reservoir 68 to a level sufficient to pass out of the upper port 56, it will be drawn off through tha port via the drain hose 28 back into the well. Once this draining starts, a suction or vacuum condition is created in the reservoir 34 which continues drawing off of the oil leaking past the lower packiny gland. ~he sealing effect of the upper packing eleme~ts in the chamber 42 is regulated by the tightening the cap 50 onto the upper portion of the housing 28 utilizing the threads 38 and 52. As the cap is tightened down on the upper portion of the housing 28, the top portion of the cap engages the projecting upper chaser 48 and forces the chaser down on the upper packing elements 44 squeezing the packing elements inwardly against the polish rod 12. Since a vacuum is created in the reservoir 34 by means of the oil leak back through port 56 and drain hose 58, the upper packing elements 44 need not sustain the high degree of pressure that would normally be present in a single stage packing gland. There-fore, the tightening of cap 50 upon ~he housing 28 need only be sufficient to establish a light seal or wiping function on the polish rod 12.
From this description, it will be understood that I have provided a packing gland with two packing stages and an inter-posed leakage drain off reservoir. The combination of these features provides a condition where the lower packing may be allowed to leak~ since the leakage will be drawn off, and the upper packing need not provide the high pressure seal that would normally be required in the case of a single stage packing gland. Accordingly, my packing gland can provide a seal on wellstheretofore difficult or impossible to seal for any long term period and can minimi~e the number of changes of packing material required in such glands.
It should also be understood that my invention and the preferred embodiment described are capable of providing the advantages and achieving the objects heretofore attributed to them.
g
. Disclosed is an improved sucker rod packing gland for oil well pumpsO The improved packing gland has two packing sections, a lower section and an upper section with a reservoir disposed between them. Oil which leaks through the lower packing section is containec S in the reservoir between upper packing section and drained from the ¦ reservoi~ by a return line which delivers it back to the well.
Delivery of the oil collected in the reservoir through the return line is accomplished by a pressure differential built up in the ¦ reservoir by reason of the ~wo packin~ stages and t~e gravity flow continues on the return line~
. I . I
.
TWO STEP PACKING GLAND
Background of the Invention This invention relates generally to packing glands for oil well pumps and more par-ticularly to improvements to such glands to prevent the leaking oE oil therefrom.
In the typical oil well pump, a sucker rod extends down into the well pipe and is reciprocated in the well pipe to draw out the oil. The sucker rod is driven by a counterweighted arm pivoted by a drive motor. The sucker rod is connected to the arm by a polish rod which passes into -the well pipe through a packing gland. At the top of the well, just under the packing gland, is a Tee which connects the well pipe to a discharge line that carries the output of the well to a collecting point or sump. According to older techniques the oil discharge lines were under relatively low pressure because the sumps were open.
Now, due to environmental protection requirements, energy conservation, and other factors, many discharge oil lines feed closed sumps or other storage facilities and must , ~
dellver the oil under substantial pressures.
Furthermore, many wells are now being inj~cted with steam to increase their productivity. This not only makes the oil less viscous, but it frequently causes -the oil to be delivered to the surface under substantial pressure.
Even before the conditions of increased discharge line pressures occurred, leaking in sucker rod packing glands was a problem. Not only was valuable oil being wasted and a messy condition being created around most well heads, but continuous maintenance was re~uired to minimize the leaking. Now that increased pressures are being created in discharge lines, and the conservation of oil and avoidance of bad environmental conditions are important considerations, this problem has been greatly accentuated.
Prior to my invention, various improvements were attempted to minimize packing gland leaks. In general, these were dir-ected toward providing a tighter seal between the gland packing and the polish rod. Since the polish rod musl continuously reciprocate in the gland, however, this approach results in faster wearout of the packing in the packing gland and increased drive motor load because of the friction between the polish rod and the packing.
In my patent 3,985,466 issued October 12, 1976, I des-cribed a Packing Gland Leak Retriever Device which undertakes to solve the leakage problem by providing a leak collector pan about the packing gland with a plunger pump which is driven by a head or platen on the sucker rod. The pump is actuated on each cycle of the sucker rod and delivers oil collected by the pan into the well discharge line through a pair of check valves.
.' . .
:~`l'' ..
: , .... .
Field experience with this device indicated certain limitations in its use, and has lead to the present invention. One problem with my prior invention is the risk of injury to oil field personnell in case they insert a hand or some other body part between the pump plunger and the head on the sucker rod while the sucker rod is reciprocating. Avoidance of this hazard has required the placement of a screen or shield about the sucker rod at the movement area of the head, which results in inconvenience when the packing gland is disassembled to replace the pa~king.
Moreover, my present invention is considerably simpler mechan-ically than my prior invention because I have been able to achieve an equivalent result without the need of a plunger pump.
An object of the present invention is to obviate or mitigate the above disadvantages.
~ccording to the present invention there is provided an oil well packing gland comprising:
a sleeve interconnectable with an oil well pipe h~ving lower threads and upper threads, the sleeve having a bore substantially greater than the diameter of a polish rod;
a sleeve flange in the lower portion of the sleeve extend-ing radially inward in the bore thereof, the sleeve flange being disposed normal to the longitudinal axis of the sleeve to support donut-shaped packing elements of the type commonly used in oil well packing thereabove when the packing elements are inserted in the sleeve bore, the sleeve flange having an internal bore greater than the outer diameter of the polish rod and disposed to pass the polish rod therethrough;
a housing having a centrally disposed vertical bore there-through of a size and shape to contain a plurality of donut-shaped packing elements of the type commonly used, wherein lower housing - 3' ~
. ~
threads are in a lower portion of the housing disposed for threaded engagement with the upper threads on the sleeve ~o assemble the housing on the sleeve;
a housing flange in the lower portion of the houslng bore and extending radially inward normal to the axis of the housing ~ore and having a central bore therein larger than the diameter of the polish rod, the housing flange being disposed to support a plurality of packing elements in the housing ~ore;
means defining a reservoir in the housing;
a drain outlet interconnected with the reservoir for draining fluid from the reservoir; and ~ap means on an upper portion of the housing.
Also in accordance with the invention there is provided a packing gland for sealing well head piping to a reciprocating polish rod comprising:
a housing having a longitudinal bore in an upper end thereof, the bore having a diameter of sufficient size and shape to accommodate an annular packing ring member;
a housing flange formed in the bottom of the housing bore and having an inner diameter of sufficient size and shape to freely pass the polish rod therethrough, the housing flange being disposed to seat and support such a packing member in the upper bore;
means defining a reservoir in the housing in fluid inter~connection with the housing bore below the top surface of the housing flange, the reservoir having an outlet for dispensing fluid therefrom through the wall of the housing; and threads in a lower portion of the housing below the reservoir said lower housing portion having a bore therein of sufficient size to freely pass said polish rod, the threads provided for engagement - 3a -.~ .`
o~ a packing sleeve of the type commonly ~sed on oil wells to thereby connect the packing sleeve to the housing, Further in accordance with the invention there is provided an oil well packing glad comprising:
a sleeve interconnectable with an oil well pipe compriqing:
threads in an upper portion of the sleeve;
a centrally disposed vertical bore through the sleeve of a size substantially greater than the diameter of a polish rod;
a sleeve flange in a lower portion of the sleeve that extends radially into the sleeve bore and is disposed normal to the longitudinal axis of the sleeve to thereby support donut-shaped packing elements when such packing elements are inserted into the sleeve bore, the sleeve flange having an internal diamater greater than the outer diameter of the polish rod and disposed to pass the polish rod therethrough;
a housing interconnectable with the sleeve comprising:
a centrally disposed vertical bore therethrough having a size and shape for containing one or more donut-shaped packing elements;
threads in a lower portion of the housing disposed ~or threaded engagement with the threads in the upper portion of the sleeve to thereby assemble the housing on the sleeve;
a flange in a lower portion of the housing that extends radially into the housing bore and is disposed normal to the longitudinal axis of the housing to thereby support donut-shaped packing elements when such packing elements are inserted into the housing,bore, the flange having an - 3b internal diameter larger t~an the diameter of the polish rod and disposed to pass the polish rod therethxough;
means de~ining a reservoir in the housing, wherein the reservoir is in fluid communication with the housing bore at a point below the top of the ho~sing flange;
a drair. outlet in fluid communication with the reservoir for draining fluid from the reservolr;
threads in an upper portion of the housing; and a cap having threads disposed for threaded engagement with the threads in the upper portion of the housing to thereby secure the cap on the hoùsing.
These and other objects and advantages of my invention will become more readily apparent from the following detailed description of a preferred embodiment, and the accompanying drawinys, in which FIG. 1 is a perspective view of an oil well sucker rod and horse's head with my sucker rod packing gland installed;
Fig. 2 is an enlarged perspective view of my sucker rod packing gland in îts preferred embodiment form;
Fig. 3 is a sectional view taken on 3-3 in Fig. 2;
Fig. 4 is a sectional view taken on 4-4 in Fig. 3.
Referring now to the drawings, the numeral 10 designates gene~ally., the preferred embodiment of my invention. The sucker rod packing gland 10 is shown mounted in alignment with a polish rod 12 disposed , . ., ~
;; - 4 ~
inside of a well pipe 14. The well pipe 14 extends above the w~ll head 16 at yround level and a discharge tee 18 which connects to the pipe rising up from the well head 16 and supplies a discharge pipe 20 that carries oil lifted from the well to a storage facility.
The polish rod 12 is raised and lowered in a well pipe 14 by a rocking horse's head 22 which is connected to the polish rod by a connecting rod 24. All this is in accordance with the usual and well known pumping procedures for oil wells.
Referring now particularly to Figs. 2 and 3, the packing gland 10 has a housing body 28 which is mounted on top of an upstanding sleeve 30, extending upwardly from the tee 18. The sleeve 30 has lower threads (not shown) by which it is connected to the tee 18. The sleeve has a bore substantially greater than the diameter o~ the polish rod 12 and is of the type commonly used for mounting packing glands. A sleeve flange (not shown) extends radially inwardly in the sleeve bore at the bottom of the sleeve and is disposed normal to the longitud-inal axis of the sleeve. The flange has an internal bore greater than the outer diameter of the polish rod 12 and includes a seat which supports lower packing 32, of the usual donut-shaped type, in the sleeve.
The housing body 28 has a reservoir 34 defined centrally about the extension of the housing 28 and has female taperea threads 36 in the lower end and standard male threads 38 in ~_ 5 .. . .
. .
the upper end. The lower end threads 36 match the tapered threads 40 in the upper end of the sleeve 30.
In the upper end of the housing 28, a cylindrical opening chamber 42 i9 provided and a shoulder or flange 43 is in the housing at its lower end. The flange 43 extends radially inwardly normal to the axis of the housing bore and has a central bore therein that is larger than the diameter of the polish rod 12. The cylindrical chamber 42 is substant~
ially larger than the polish rod 12 and of an appropriate size to snugly contain standard elements of upper packing 44 of doughnut-shape which are similar to the lower - 5a packing 32 but are mounted in the upper packing area of chamber 42. ~ doughnut-shaped base ring 46 is disposed in the lower portion of the chamber 42 on the top surface of the flange or shoulder 43 to support the upper packing elements 44 in the chamber 4~, and a similar base ring (not shown) is utilized to support the lower packing 32 contained by sleeve 30. An upper chaser 48 is mounted in the upper portion of the chamber 42 on top o~ the upper packing elements 44. The upper chaser 48 has a greater axial width than thP remaining height o~ the chamber 42 so that it extends above the chamber and it is formed of brass and is doughnut-shaped so that it accommodates the polish rod 12 through its center. The upper chaser 48 sets on top of the upper packing elements 44 to hold the packing elements in place. A
cap 50 is threadedly engaged with the male threads 38 at the top of the housing 28 by means of female matching threads 52. When the cap 50 is threaded onto the upper portion of the housing 28 on threads 38 by means of the matching threads 52, the central portion of the cap i.e. the cap land engages the upper chaser 4S
and presses the upper chaser down upon the upper packing elements 44 to compress the packing elements against the base ring 46 and thus, against the top surface of the shoulder 43 and force them inwardly around the polish rod 12, all in a manner well known in the art. The housing 28 has a lower port 54 which is connected to and disposed at the same level as the bottom of the reservoir 34 and an upper port 56 which is disposed at the top portion of the reservoir 34 higher than the lower port 54. Each of these ports is tapped for threads and can be plugged or connected to a drain hose.
In actual use, the upper port 56 is connected to a drain hose 58 which passes back down through the well head 16 into the well and drains, from the reservoir 34, the oil accumulated therein by ~.
.. .
! 6 "' '.
, leakage pa~t the lower packing in sleeve 30. The lower port 54 is normally closed with a plug that can be opened for purposes of draining the reservoir 34 portion o:E the housing 28 for cleaning.
The cap 50 has a pair oE ears 60 to assist in the tighten-ing down or loosening of the cap in a manner well known in theoil field art.
The lower packing gland 30 has a lower packing gland chaser or land means 62 which rides on top of the lower packing 32 and is pressed into the packing by means of a lower chaser flange 64 i.e. ~he bottom surface of the shoulder or flange 43, when the housing 28 is threaded onto the sleeve 30.
As best shown in Fig. 4, the reservoir 34 has a central portion 66 disposed about the polish rod 12 below the upper packing elements 44 and a generally cylindrical outer reservoir portion 68 which extends upwardly in the housing 28 from the central portion 66 and is spaced outwardly from the chamber 42.
Cross holes 70 interconnect the central portions 66 of the reservoir 34 with the outer reservoir 68 at quadrants about the longitudinal axis of the housing 28.
OPERATION
In operation, my device functions substantially as follows.
I~hen the well pump is placed in operation, the polish rod 12 reciprocates inside the packing gland 10. The lower packing 32 in the sleeve 30 is held in position by a lower base ring similar to upper base ring 46 and the lower packing gland chaser 62.
The lower packing gland chaser 62 is preseed down upon the lower packing 32 in the sleeve 30 by the lower chaser flange 64 ,~, by threading of the sleeve 30 into the lower end o~ the housing 28 utilizing threads 36 and 40. The lower packing gland chaser 62 in the lower packing portion of sleeve 30 extends above the top of the sleeve to give a surface for engaging the lower cha~er flange 64 of the housing 28.
The pressure thereby placed on the packing 32 squeezes the lower packing 32 onto the polish rod 12 in the lower packing area of sleeve 30, to an extent that depends upon the degree to which the housing 28 is tightened down into the top of the sleeve 30.
In a proper installation this tightening will be less than is normally utilized with a single packing gland in order to permit a small degree of leakage through the bottom packing area. This leakage will be collected in the reservoir 34 and when it rises in the outer reservoir 68 to a level sufficient to pass out of the upper port 56, it will be drawn off through tha port via the drain hose 28 back into the well. Once this draining starts, a suction or vacuum condition is created in the reservoir 34 which continues drawing off of the oil leaking past the lower packiny gland. ~he sealing effect of the upper packing eleme~ts in the chamber 42 is regulated by the tightening the cap 50 onto the upper portion of the housing 28 utilizing the threads 38 and 52. As the cap is tightened down on the upper portion of the housing 28, the top portion of the cap engages the projecting upper chaser 48 and forces the chaser down on the upper packing elements 44 squeezing the packing elements inwardly against the polish rod 12. Since a vacuum is created in the reservoir 34 by means of the oil leak back through port 56 and drain hose 58, the upper packing elements 44 need not sustain the high degree of pressure that would normally be present in a single stage packing gland. There-fore, the tightening of cap 50 upon ~he housing 28 need only be sufficient to establish a light seal or wiping function on the polish rod 12.
From this description, it will be understood that I have provided a packing gland with two packing stages and an inter-posed leakage drain off reservoir. The combination of these features provides a condition where the lower packing may be allowed to leak~ since the leakage will be drawn off, and the upper packing need not provide the high pressure seal that would normally be required in the case of a single stage packing gland. Accordingly, my packing gland can provide a seal on wellstheretofore difficult or impossible to seal for any long term period and can minimi~e the number of changes of packing material required in such glands.
It should also be understood that my invention and the preferred embodiment described are capable of providing the advantages and achieving the objects heretofore attributed to them.
g
Claims (10)
1. An oil well packing gland comprising:
a sleeve interconnectable with an oil well pipe having lower threads and upper threads, the sleeve having a bore substantially greater than the diameter of a polish rod;
a sleeve flange in the lower portion of the sleeve extend-ing radially inward in the bore thereof, the sleeve flange being disposed normal to the longitudinal axis of the sleeve to support donut-shaped packing elements of the type commonly used in oil well packing thereabove when the packing elements are inserted in the sleeve bore, the sleeve flange having an internal bore greater than the outer diameter of the polish rod and disposed to pass the polish rod therethrough;
a housing having a centrally disposed vertical bore there-through of a size and shape to contain a plurality of donut-shaped packing elements of the type commonly used, wherein lower housing threads are in a lower portion of the housing disposed for threaded engagement with the upper threads on the sleeve to assemble the housing on the sleeve;
a housing flange in the lower portion of the housing bore and extending radially inward normal to the axis of the housing bore and having a central bore therein larger than the diameter of the polish rod, the housing flange being disposed to support a plurality of packing elements in the housing bore;
means defining a reservoir in the housing;
a drain outlet interconnected with the reservoir for draining fluid from the reservoir; and cap means on an upper portion of the housing.
a sleeve interconnectable with an oil well pipe having lower threads and upper threads, the sleeve having a bore substantially greater than the diameter of a polish rod;
a sleeve flange in the lower portion of the sleeve extend-ing radially inward in the bore thereof, the sleeve flange being disposed normal to the longitudinal axis of the sleeve to support donut-shaped packing elements of the type commonly used in oil well packing thereabove when the packing elements are inserted in the sleeve bore, the sleeve flange having an internal bore greater than the outer diameter of the polish rod and disposed to pass the polish rod therethrough;
a housing having a centrally disposed vertical bore there-through of a size and shape to contain a plurality of donut-shaped packing elements of the type commonly used, wherein lower housing threads are in a lower portion of the housing disposed for threaded engagement with the upper threads on the sleeve to assemble the housing on the sleeve;
a housing flange in the lower portion of the housing bore and extending radially inward normal to the axis of the housing bore and having a central bore therein larger than the diameter of the polish rod, the housing flange being disposed to support a plurality of packing elements in the housing bore;
means defining a reservoir in the housing;
a drain outlet interconnected with the reservoir for draining fluid from the reservoir; and cap means on an upper portion of the housing.
2. An oil well packing gland as claimed in claim 1, in which:
the cap means includes a vertical bore therethrough disposed to pass the polish rod, and land means disposed to engage and compress packing elements in the housing bore against the housing flange.
the cap means includes a vertical bore therethrough disposed to pass the polish rod, and land means disposed to engage and compress packing elements in the housing bore against the housing flange.
3. An oil well packing gland as claimed in claim 1, comprising:
land means disposed therein to engage and compress packing elements in the sleeve bore when the housing and sleeve are threadedly assembled.
land means disposed therein to engage and compress packing elements in the sleeve bore when the housing and sleeve are threadedly assembled.
4. An oil well packing gland as claimed in claim 3, in which the cap means includes:
a vertical bore therethrough disposed to pass a polish rod and land means disposed to engage and compress packing elements in the housing bore against the housing flange when the cap is threadedly engaged on the housing.
a vertical bore therethrough disposed to pass a polish rod and land means disposed to engage and compress packing elements in the housing bore against the housing flange when the cap is threadedly engaged on the housing.
5. An oil well packing gland as claimed in claim 1, in which:
the reservoir defining means is an annular bore formed in the housing around the housing bore and is in fluid communication with the housing bore at a point below the top of the housing flange.
the reservoir defining means is an annular bore formed in the housing around the housing bore and is in fluid communication with the housing bore at a point below the top of the housing flange.
6. A packing gland for sealing well head piping to a reciprocating polish rod comprising:
a housing having a longitudinal bore in an upper end thereof, the bore having a diameter of sufficient size and shape to accommodate an annular packing ring member;
a housing flange formed in the bottom of the housing bore and having an inner diameter of sufficient size and shape to freely pass the polish rod therethrough, the housing flange being disposed to seat and support such a packing member in the upper bore;
means defining a reservoir in the housing in fluid inter-connection with the housing bore below the top surface of the housing flange, the reservoir having an outlet for dispensing fluid therefrom through the wall of the housing; and threads in a lower portion of the housing below the reservoir said lower housing portion having a bore therein of sufficient size to freely pass said polish rod, the threads provided for engagement of a packing sleeve of the type commonly used on oil wells to thereby connect the packing sleeve to the housing.
a housing having a longitudinal bore in an upper end thereof, the bore having a diameter of sufficient size and shape to accommodate an annular packing ring member;
a housing flange formed in the bottom of the housing bore and having an inner diameter of sufficient size and shape to freely pass the polish rod therethrough, the housing flange being disposed to seat and support such a packing member in the upper bore;
means defining a reservoir in the housing in fluid inter-connection with the housing bore below the top surface of the housing flange, the reservoir having an outlet for dispensing fluid therefrom through the wall of the housing; and threads in a lower portion of the housing below the reservoir said lower housing portion having a bore therein of sufficient size to freely pass said polish rod, the threads provided for engagement of a packing sleeve of the type commonly used on oil wells to thereby connect the packing sleeve to the housing.
7. A packing gland for sealing well head piping to a reciprocating polish rod as claimed in claim 6, in which:
the housing further includes cap means disposed to releasably close the upper end of the housing bore, the cap means having land means disposed to engage packing elements disposed in the housing bore and compress the same against the housing flange.
the housing further includes cap means disposed to releasably close the upper end of the housing bore, the cap means having land means disposed to engage packing elements disposed in the housing bore and compress the same against the housing flange.
8. A packing gland for sealing well head piping to a reciprocating polish rod as described in claim 7, in which:
the housing also includes land means disposed to engage packing elements disposed in the packing sleeve and to compress the packing elements.
the housing also includes land means disposed to engage packing elements disposed in the packing sleeve and to compress the packing elements.
9. An oil well packing gland comprising:
a sleeve interconnectable with an oil well pipe comprising:
threads in an upper portion of the sleeve;
a centrally disposed vertical bore through the sleeve of a size substantially greater than the diameter of a polish rod;
a sleeve flange in a lower portion of the sleeve that extends radially into the sleeve bore and is disposed normal to the longitudinal axis of the sleeve to thereby support donut-shaped packing elements when such packing elements are inserted into the sleeve bore, the sleeve flange having an internal diameter greater than the outer diameter of the polish rod and disposed to pass the polish rod therethrough;
a housing interconnectable with the sleeve comprising:
a centrally disposed vertical bore therethrough having a size and shape for containing one or more donut-shaped packing elements;
threads in a lower portion of the housing disposed for threaded engagement with the threads in the upper portion of the sleeve to thereby assemble the housing on the sleeve;
a flange in a lower portion of the housing that extends radially into the housing bore and is disposed normal to the longitudinal axis of the housing to thereby support donut-shaped packing elements when such packing elements are inserted into the housing bore, the flange having an internal diameter larger than the diameter of the polish rod and disposed to pass the polish rod therethrough;
means defining a reservoir in the housing, wherein the reservoir is in fluid communication with the housing bore at a point below the top of the housing flange;
a drain outlet in fluid communication with the reservoir for draining fluid from the reservoir;
threads in an upper portion of the housing; and a cap having threads disposed for threaded engagement with the threads in the upper portion of the housing to thereby secure the cap on the housing.
a sleeve interconnectable with an oil well pipe comprising:
threads in an upper portion of the sleeve;
a centrally disposed vertical bore through the sleeve of a size substantially greater than the diameter of a polish rod;
a sleeve flange in a lower portion of the sleeve that extends radially into the sleeve bore and is disposed normal to the longitudinal axis of the sleeve to thereby support donut-shaped packing elements when such packing elements are inserted into the sleeve bore, the sleeve flange having an internal diameter greater than the outer diameter of the polish rod and disposed to pass the polish rod therethrough;
a housing interconnectable with the sleeve comprising:
a centrally disposed vertical bore therethrough having a size and shape for containing one or more donut-shaped packing elements;
threads in a lower portion of the housing disposed for threaded engagement with the threads in the upper portion of the sleeve to thereby assemble the housing on the sleeve;
a flange in a lower portion of the housing that extends radially into the housing bore and is disposed normal to the longitudinal axis of the housing to thereby support donut-shaped packing elements when such packing elements are inserted into the housing bore, the flange having an internal diameter larger than the diameter of the polish rod and disposed to pass the polish rod therethrough;
means defining a reservoir in the housing, wherein the reservoir is in fluid communication with the housing bore at a point below the top of the housing flange;
a drain outlet in fluid communication with the reservoir for draining fluid from the reservoir;
threads in an upper portion of the housing; and a cap having threads disposed for threaded engagement with the threads in the upper portion of the housing to thereby secure the cap on the housing.
10. An oil well packing gland as claimed in claim 9 wherein the cap has a vertical bore therethrough disposed to pass the polish rod and a bottom surface disposed to engage and compress packing elements in the housing bore against the housing flange when the cap is tightened on the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000399289A CA1189549A (en) | 1982-03-24 | 1982-03-24 | Two step packing gland |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000399289A CA1189549A (en) | 1982-03-24 | 1982-03-24 | Two step packing gland |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1189549A true CA1189549A (en) | 1985-06-25 |
Family
ID=4122392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000399289A Expired CA1189549A (en) | 1982-03-24 | 1982-03-24 | Two step packing gland |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1189549A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354986A (en) * | 2022-08-10 | 2022-11-18 | 鞍山捷高科技有限公司 | Polished rod sealing assembly |
-
1982
- 1982-03-24 CA CA000399289A patent/CA1189549A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354986A (en) * | 2022-08-10 | 2022-11-18 | 鞍山捷高科技有限公司 | Polished rod sealing assembly |
| CN115354986B (en) * | 2022-08-10 | 2023-10-03 | 鞍山捷高科技有限公司 | Polished rod sealing assembly |
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