CA2281237A1 - Well tool - Google Patents
Well tool Download PDFInfo
- Publication number
- CA2281237A1 CA2281237A1 CA 2281237 CA2281237A CA2281237A1 CA 2281237 A1 CA2281237 A1 CA 2281237A1 CA 2281237 CA2281237 CA 2281237 CA 2281237 A CA2281237 A CA 2281237A CA 2281237 A1 CA2281237 A1 CA 2281237A1
- Authority
- CA
- Canada
- Prior art keywords
- rod
- ribs
- rod guide
- tubular body
- shank
- 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.)
- Abandoned
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- Earth Drilling (AREA)
Abstract
Rod guides for maintaining a rod of a sucker rod string in substantially central position in a well tubing during reciprocal movement of the sucker rod string in the well tubing.
Description
This invention relates to well tools and more particularly to rod guides rigidly fixed to the shanks of rods of a sucker rod string reciprocable in a well tubing to operate a well pump.
BACKGROUND OF THE INVENTION
Rod guides or centralizers which are rigidly mounted on the shanks of the rods of a reciprocable sucker rod string are used to hold the rods in substantially concentric position in a well tubing in order to minimize wear or erosion of the well tubing by preventing contact of the sucker rods and particularly their enlarged end connectors with the internal surfaces of the well tubing. The rod guides should provide large areas of contact thereof with the internal surfaces of the well tubing to minimize the force per unit area of contact between the rod guides and the internal surfaces of the well tubing, thus minimizing their erosion,, and also to provide large volumes of the erodable substance of the rod guide to increase the length of operation of the rod guides before erosion of the rod guides due to such sliding contact thereof with the internal surfaces of the tubing requiring their replacement. It is desirable however that the centralizers offer low resistance to the flow of liquids therepast during the reciprocation of the rod string and operation of the pump thereby in order to achieve optimum rates of production of well fluids and to minimize the energy necessary to reciprocate the sucker rod string and operate the pump. The rod guides become ineffective when outer portions thereof are eroded to such an extent that they do not prevent contact of enlarged portions of the sucker rod string, such as at the couplings between adjacent ends of the rods of the rod string with the internal surfaces of the well tubing.
The fixed centralizers or rod guides may act as tubing scrapers in portions of the well tubing where waxes, tars or other substances may come out of solution and tend to deposit on the internal surfaces of the well tubing. Centralizers and/or scrapers of this type have been illustrated in United States Patent No. 5,452,760, United States Patent No. 5,806,591 and the references cited therein.
OBJECTS OF THE INVENTION
Accordingly it is an obj ect of this invention to provide a new and improved rod guide which provides large areas of contact with the well tubing to minimize the force per unit area in contact therewith but which provides a relatively large cross-sectional area of flow of fluid therepast in the well tubing.
Another object of the invention is to provide a rod guide, of the type described, having a tubular body rigidly fixed in the shank of a rod and a plurality of ribs extending radially outwardly of the body, the ribs having a enlarged radially outwardly disposed portions of greater circumferential width than at their connections with the tubular body.
Another object is to provide a rod guide, of the type described, wherein the ribs have circumferentially outer enlarged portions which combine with the tubular body to form large general passages which open outwardly of the tubular body between adjacent spaced ribs.
SUMMARY OF THE INVENTION
A sucker rod having a tubular body rigid with the shank of a sucker rod having circumferentially spaced ribs extending radially outwardly from the tubular body the ribs having grooves in sides thereof which increase the cross-sectional area of the flow passage betraeen the rod guide and the internal surfaces of a well tubing while providing a large area of contact between the ribs and the internal surfaces of a well tubing and providing a large volume of substance which may erode or wear away due to the sliding frictional contact of the outer circumferential surfaces of the ribs with the internal surfaces of the well tubing.
DESCRIPTION OF THE DRAWINGS
Additional objects of the invention will become apparent from the reading of the following description of rod guides embodying the invention and reference to the accompanying drawings wherein:
Figure 1 is a fragmentary longitudinal view of a sucker rod string provided with rod guides embodying the invention;
Figure 2A is a sectional view taken on line 2A-2A of Figure 1;
Figure 2B is a sectional view taken on line 2B-28 of Figure 1;
Figure 3 is a sectional view taken on line 3 Figure l;
Figure 4 is a side view of another rod guide embodying the invention;
Figure 5 is another side view of the rod guide of Figure 4;
Figure 6 is a longitudinal sectional view taken on line 6-6 of Figure 4;
Figure 7 is a sectional view taken on line 7-7 of Figure 5, and Figure 8 is a view taken on line 8-8 of Figure 5.
BACKGROUND OF THE INVENTION
Rod guides or centralizers which are rigidly mounted on the shanks of the rods of a reciprocable sucker rod string are used to hold the rods in substantially concentric position in a well tubing in order to minimize wear or erosion of the well tubing by preventing contact of the sucker rods and particularly their enlarged end connectors with the internal surfaces of the well tubing. The rod guides should provide large areas of contact thereof with the internal surfaces of the well tubing to minimize the force per unit area of contact between the rod guides and the internal surfaces of the well tubing, thus minimizing their erosion,, and also to provide large volumes of the erodable substance of the rod guide to increase the length of operation of the rod guides before erosion of the rod guides due to such sliding contact thereof with the internal surfaces of the tubing requiring their replacement. It is desirable however that the centralizers offer low resistance to the flow of liquids therepast during the reciprocation of the rod string and operation of the pump thereby in order to achieve optimum rates of production of well fluids and to minimize the energy necessary to reciprocate the sucker rod string and operate the pump. The rod guides become ineffective when outer portions thereof are eroded to such an extent that they do not prevent contact of enlarged portions of the sucker rod string, such as at the couplings between adjacent ends of the rods of the rod string with the internal surfaces of the well tubing.
The fixed centralizers or rod guides may act as tubing scrapers in portions of the well tubing where waxes, tars or other substances may come out of solution and tend to deposit on the internal surfaces of the well tubing. Centralizers and/or scrapers of this type have been illustrated in United States Patent No. 5,452,760, United States Patent No. 5,806,591 and the references cited therein.
OBJECTS OF THE INVENTION
Accordingly it is an obj ect of this invention to provide a new and improved rod guide which provides large areas of contact with the well tubing to minimize the force per unit area in contact therewith but which provides a relatively large cross-sectional area of flow of fluid therepast in the well tubing.
Another object of the invention is to provide a rod guide, of the type described, having a tubular body rigidly fixed in the shank of a rod and a plurality of ribs extending radially outwardly of the body, the ribs having a enlarged radially outwardly disposed portions of greater circumferential width than at their connections with the tubular body.
Another object is to provide a rod guide, of the type described, wherein the ribs have circumferentially outer enlarged portions which combine with the tubular body to form large general passages which open outwardly of the tubular body between adjacent spaced ribs.
SUMMARY OF THE INVENTION
A sucker rod having a tubular body rigid with the shank of a sucker rod having circumferentially spaced ribs extending radially outwardly from the tubular body the ribs having grooves in sides thereof which increase the cross-sectional area of the flow passage betraeen the rod guide and the internal surfaces of a well tubing while providing a large area of contact between the ribs and the internal surfaces of a well tubing and providing a large volume of substance which may erode or wear away due to the sliding frictional contact of the outer circumferential surfaces of the ribs with the internal surfaces of the well tubing.
DESCRIPTION OF THE DRAWINGS
Additional objects of the invention will become apparent from the reading of the following description of rod guides embodying the invention and reference to the accompanying drawings wherein:
Figure 1 is a fragmentary longitudinal view of a sucker rod string provided with rod guides embodying the invention;
Figure 2A is a sectional view taken on line 2A-2A of Figure 1;
Figure 2B is a sectional view taken on line 2B-28 of Figure 1;
Figure 3 is a sectional view taken on line 3 Figure l;
Figure 4 is a side view of another rod guide embodying the invention;
Figure 5 is another side view of the rod guide of Figure 4;
Figure 6 is a longitudinal sectional view taken on line 6-6 of Figure 4;
Figure 7 is a sectional view taken on line 7-7 of Figure 5, and Figure 8 is a view taken on line 8-8 of Figure 5.
Referring now particularly to Figures 1-3 of the drawings, the rod guide 10 embodying the invention are shown rigidly mounted on the shank S of the sucker rod whose ends are secured to adjacent ends of adjacent rods of the tubing rod string by couplings C. The sucker rods of the string have opposite enlarged end portions provided with threaded pins means of which their threaded couplings C secure the rods to another as is well known to those skilled in the art.
The rod guide has a tubular body 11 molded on and rigid with the shank and have two ribs 13 and 14 which extend radially outwardly in opposite directions from the tubular body. These ribs have longitudinally side surfaces 15 and 16 which lie in a plane diametric with the longitudinal central axis of the shank of the rod. The ribs 13 and 14 have circumferentially enlarged outer portions 18 and 19, respectively, which define with the tubular body longitudinal grooves or passages 20 and 21 which open to the longitudinally extending spaces between the ribs l3 and 14 and the third rib 17 which also extends radially outwardly of the body.
The other sides 22 and 23 of the ribs 13 and 14, respectively, define a longitudinal channel for the purpose as described and illustrated in United States Patent No. 5,806,591.
It will be apparent to those skilled in the art, that the mold in which the rod guide is formed about the shank has two components, one having a cavity which forms the lower half of the rod guide which includes the ribs 13 and 14 as seen in Figure 2A
and the other which forms the top half of the rod guide, which includes the third rib 17.
The rod guide has beveled end shoulders 26 and 27 which slope in opposite directions from the outer surface to the rod guide to the rod shank.
It will be seen in Figure 1 that the channels 20 and 21 extend radially outwardly a distance substantially equal or somewhat less than the radial distance the coupling C extends outwardly of the shank.
The ribs wear due to their sliding abrasion abrasion with the internal surfaces of the well tubing during the reciprocation of the sucker rod string. The rods thereof can be displaced further from central alignment within the well tubing as they wear and will permit the enlarged portions of the sucker rod string, the couplings, to slidingly engage the internal surfaces of the well tubing. Inasmuch as it is much more expensive to replace the tubing than the rod guides whose ribs have been abraded to the point where they permit the coupling to contact the internal surfaces of the well tuning than to replace such guide rods or to replace the sucker rod whose guides have been abraded to such degree.
It will be noted that the channels 20 and 21 extend radially outwardly of the central axis of the rod shank a distance substantially equal to or slightly less than the distance the couplings outer surfaces of the couplings extend radially from the central axis of the rod.
It will now be seen that the provision of the channels 20 and 21 substantially increases the cross-sectional area of the fluid passage between the internal surfaces of the well tubing and the rod guide which leads to lesser resistance to flow of the well fluids past the rod guide and decreases the energy required to maintain a desired rate of flow of the well fluids by the action of the pump during the reciprocation of the sucker rod string.
Referring now to Figures 4-8 of the drawings, another rod guide 50 embodying the invention includes a tubular body 51 rigidly mounted on the shank of a sucker rod, as by molding, having four ribs 54, 55, 56 and 57 integral therewith. The four ribs extend longitudinally angularly relative to the central longitudinal axis of the rod and their outer surfaces lie in a cylindrical plane concentric with the central longitudinal axis of the rod. The ribs 54 have side surfaces 61 and 62 and the rib 55 has parallel side surfaces 63 and 64. The rib 56 has channel 71, 72 and the rib 57 has side channels or grooves 73 and 74 in order to provide a greater cross-sectional area of the fluid flow or passage past the rod guide when it is in a well tubing.
_7_ It will now be seen that a new and improved rod guides have been illustrated and described which provide a relative large sectional area fluid flow passage past the rod guide when it is mounted on the rods of a sucker rod string while providing a large area of contact of the guide ribs with the internal surfaces of a well tubing.
It will further be seen that as the ribs erode they permit a greater displacement of the rib string from the central position in the well tubing and that they become ineffective when they wear to such an extent that they permit portions of the rod string as at couplings, to engage to contact the internal surfaces of the well tubing.
It will further be known to those skilled in the art that in order to prolong the usable line of these guides the rod string may be rotated at the surface by suitable means to insure uniform wear or erosion of the ribs and thus prolong the useful life of the rod guides.
The foregoing descriptions are explanatory only in changes of the details of the constructions illustrated may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
_g_
The rod guide has a tubular body 11 molded on and rigid with the shank and have two ribs 13 and 14 which extend radially outwardly in opposite directions from the tubular body. These ribs have longitudinally side surfaces 15 and 16 which lie in a plane diametric with the longitudinal central axis of the shank of the rod. The ribs 13 and 14 have circumferentially enlarged outer portions 18 and 19, respectively, which define with the tubular body longitudinal grooves or passages 20 and 21 which open to the longitudinally extending spaces between the ribs l3 and 14 and the third rib 17 which also extends radially outwardly of the body.
The other sides 22 and 23 of the ribs 13 and 14, respectively, define a longitudinal channel for the purpose as described and illustrated in United States Patent No. 5,806,591.
It will be apparent to those skilled in the art, that the mold in which the rod guide is formed about the shank has two components, one having a cavity which forms the lower half of the rod guide which includes the ribs 13 and 14 as seen in Figure 2A
and the other which forms the top half of the rod guide, which includes the third rib 17.
The rod guide has beveled end shoulders 26 and 27 which slope in opposite directions from the outer surface to the rod guide to the rod shank.
It will be seen in Figure 1 that the channels 20 and 21 extend radially outwardly a distance substantially equal or somewhat less than the radial distance the coupling C extends outwardly of the shank.
The ribs wear due to their sliding abrasion abrasion with the internal surfaces of the well tubing during the reciprocation of the sucker rod string. The rods thereof can be displaced further from central alignment within the well tubing as they wear and will permit the enlarged portions of the sucker rod string, the couplings, to slidingly engage the internal surfaces of the well tubing. Inasmuch as it is much more expensive to replace the tubing than the rod guides whose ribs have been abraded to the point where they permit the coupling to contact the internal surfaces of the well tuning than to replace such guide rods or to replace the sucker rod whose guides have been abraded to such degree.
It will be noted that the channels 20 and 21 extend radially outwardly of the central axis of the rod shank a distance substantially equal to or slightly less than the distance the couplings outer surfaces of the couplings extend radially from the central axis of the rod.
It will now be seen that the provision of the channels 20 and 21 substantially increases the cross-sectional area of the fluid passage between the internal surfaces of the well tubing and the rod guide which leads to lesser resistance to flow of the well fluids past the rod guide and decreases the energy required to maintain a desired rate of flow of the well fluids by the action of the pump during the reciprocation of the sucker rod string.
Referring now to Figures 4-8 of the drawings, another rod guide 50 embodying the invention includes a tubular body 51 rigidly mounted on the shank of a sucker rod, as by molding, having four ribs 54, 55, 56 and 57 integral therewith. The four ribs extend longitudinally angularly relative to the central longitudinal axis of the rod and their outer surfaces lie in a cylindrical plane concentric with the central longitudinal axis of the rod. The ribs 54 have side surfaces 61 and 62 and the rib 55 has parallel side surfaces 63 and 64. The rib 56 has channel 71, 72 and the rib 57 has side channels or grooves 73 and 74 in order to provide a greater cross-sectional area of the fluid flow or passage past the rod guide when it is in a well tubing.
_7_ It will now be seen that a new and improved rod guides have been illustrated and described which provide a relative large sectional area fluid flow passage past the rod guide when it is mounted on the rods of a sucker rod string while providing a large area of contact of the guide ribs with the internal surfaces of a well tubing.
It will further be seen that as the ribs erode they permit a greater displacement of the rib string from the central position in the well tubing and that they become ineffective when they wear to such an extent that they permit portions of the rod string as at couplings, to engage to contact the internal surfaces of the well tubing.
It will further be known to those skilled in the art that in order to prolong the usable line of these guides the rod string may be rotated at the surface by suitable means to insure uniform wear or erosion of the ribs and thus prolong the useful life of the rod guides.
The foregoing descriptions are explanatory only in changes of the details of the constructions illustrated may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
_g_
Claims (7)
1. A rod guide rigidly mounted on and about the shank of a rod, said guide having a tubular body rigid with the shank of the rod shank and having a plurality of ribs extending radially outwardly from said tubular body and having outer surfaces lying in a cylindrical plane concentric with the central longitudinal axis of said tubular body, said ribs having radially outer surfaces of greater circumferential width then the width of said ribs at their connection with said tubular body.
2. The rod guide of Claim 1, wherein two of said ribs have side surfaces lying in a single plane diametric with the longitudinal central axis of the shank of the rod and spaced radially outwardly of the outer surface of said tubular body to define therewith passages therebetween.
3. The rod guide of Claim 2, wherein said rod guide has a third rib extending perpendicularly outwardly relative to first and second surfaces of said first and second ribs.
4. The rod guide of Claim 1, wherein said rod guide has a third rib extending perpendicularly outwardly relative to first and second surfaces of said first and second ribs.
5. The rod guide of Claim 1, wherein said ribs extend longitudinally angularly relative to the central longitudinal axis of said tubular body.
6. The rod guide of Claim 5, wherein two of said ribs have grooves in opposite sides thereof forming passages with said tubular body.
7. The rod guide of Claim 6, wherein said passages of each rib extend parallel to one another.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US35135799A | 1999-07-12 | 1999-07-12 | |
| US09/351,357 | 1999-07-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2281237A1 true CA2281237A1 (en) | 2001-01-12 |
Family
ID=23380568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2281237 Abandoned CA2281237A1 (en) | 1999-07-12 | 1999-09-01 | Well tool |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2281237A1 (en) |
-
1999
- 1999-09-01 CA CA 2281237 patent/CA2281237A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |