CA1090325A - Replaceable sleeve drill collar stabilizer - Google Patents
Replaceable sleeve drill collar stabilizerInfo
- Publication number
- CA1090325A CA1090325A CA326,881A CA326881A CA1090325A CA 1090325 A CA1090325 A CA 1090325A CA 326881 A CA326881 A CA 326881A CA 1090325 A CA1090325 A CA 1090325A
- Authority
- CA
- Canada
- Prior art keywords
- multiplicity
- stabilizer
- replaceable sleeve
- sleeve
- mandrel
- 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.)
- Expired
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Abstract
REPLACEABLE SLEEVE DRILL COLLAR STABILIZER
Abstract of the Disclosure A replaceable sleeve drill collar stabilizer is provided having a metal mandrel with a flow passage therethrough. A
threaded box is located at the upper end of the metal mandrel and a threaded pin is located at the lower end of the metal mandrel.
A replaceable sleeve is positioned around the metal mandrel. The replaceable sleeve includes longitudinally extending stabilizer sections. Means for preventing relative rotation between the replaceable sleeve and the metal mandrel are provided including a locking element that extends through said sleeve into a mating indentation in the metal mandrel. A weld rigidly connects the locking element to said replaceable sleeve. Worn sleeve replacement is accomplished by removal of the small amount of weld joining the locking element to the sleeve.
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Abstract of the Disclosure A replaceable sleeve drill collar stabilizer is provided having a metal mandrel with a flow passage therethrough. A
threaded box is located at the upper end of the metal mandrel and a threaded pin is located at the lower end of the metal mandrel.
A replaceable sleeve is positioned around the metal mandrel. The replaceable sleeve includes longitudinally extending stabilizer sections. Means for preventing relative rotation between the replaceable sleeve and the metal mandrel are provided including a locking element that extends through said sleeve into a mating indentation in the metal mandrel. A weld rigidly connects the locking element to said replaceable sleeve. Worn sleeve replacement is accomplished by removal of the small amount of weld joining the locking element to the sleeve.
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Description
Background of the Invention The present invention relates to the art of oil and gas drilling and more particularly to a drill stabilizer well tool for engaging the wall of a well bore above the bit in lateral , 5 stabilizing relation with the drill string.
Drill stabilizers are well known in the art. They consist of a well tool which is made part of a drill string by inserting it between parts of the drilling string that are normally joined together. The drill collar stabilizer is located between the bit and the lower end of a drill collar or between the upper end of a drill collar and the lower end of a string of drill pipe. The device projects outward to bear upon or engage the wall of the well bore. In addition to centering and stabilizing the drill string, the drill collar stabilizer acts as a fulcrum in directional drilling operations. The stabilizer must withstand substantial forces and still provide a passage for circulation of drilling mud during the drilling operation. In rotary drilling operations wherein one or more stabilizers are used in the drill - string, the lateral forces in compression and shear are very great.Drill collar stabilizers are of various types. One of the better known types is the blade type or drill blade type stabilizer, which comprises in general a body or a mandrel portion to which are affixed spiraled blades which extend from the body portion to the diameter of the well bore. The plurality of blades are so arranged about the circumference of the tool body that when in engagement with the wall of the well bore spaces for circulation of mud and removal of cuttings and debris from the well are provided bet~een the blades. Typically three or four such blades are utilized and are equally spaced circumferentially about the tool body. The blades are generally spiraled or set at an angle with respect to the vertical axis of the drill string so that the plurality of the blades present a large arcuate bearing with the well bore wall.
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The stabilizer is subject to very great stresses during the drilling operation. The radially extending blades must be securely fastened to the stabilizer body to insure that the blades -! Will not break loose and necessitate an expensive and time consuming - 5 fishing job. However, in addition to the blades being securely affixed to the body, they should be mounted in a way permitting easy removal and replacement since the blades of the stabilizer are subject to wear and deterioration in use. It is another requirement of such drill collar blade stabilizers that the blades will not rotate relative to the tool body, i.e., that the blades are affixed -` thereto in such manner that they rotate with the drill string.
Another important consideration is the ease, simplicity, economy and reliability of manufacture. Prior art stabilizers . have been more expensive to manufacture and the manufacturing ~; 15 operation has been more complicated than desired.
Description of Prior Art ,, .
; Drill collar stabilizers have progressed from a solid boss type, through the rubber sleeve type to the integral blade ,~ stabilizer, which our available reference material indicates 20 was introduced about 1954. The replaceable sleeve type stabilizer consists of a mandrel with a replaceable stabilizing sleeve element installed on the mandrel. Previously the methods of !~, retaining the sleeve consisted of a shrink fit (sleeve heated and slipped onto the mandrel), threaded sleeve or threaded two piece mandrel, by welding, bolting or by a form of dovetail arrangement between the blade and body.
In U. S. Patent No. 3,645,587 to Bill G. Parker, patented February 29, 1972, a drill string stabilizer is shown.
A bottom hole stabilizer, or similar drill string member, is provided with three substantially straight longitudinal ribs on its surface, and the ribs are spaced apart to leave annular flow areas between rib sections. The member is formed as an integral construction by milling flat bottom grooves into a tubular blank
Drill stabilizers are well known in the art. They consist of a well tool which is made part of a drill string by inserting it between parts of the drilling string that are normally joined together. The drill collar stabilizer is located between the bit and the lower end of a drill collar or between the upper end of a drill collar and the lower end of a string of drill pipe. The device projects outward to bear upon or engage the wall of the well bore. In addition to centering and stabilizing the drill string, the drill collar stabilizer acts as a fulcrum in directional drilling operations. The stabilizer must withstand substantial forces and still provide a passage for circulation of drilling mud during the drilling operation. In rotary drilling operations wherein one or more stabilizers are used in the drill - string, the lateral forces in compression and shear are very great.Drill collar stabilizers are of various types. One of the better known types is the blade type or drill blade type stabilizer, which comprises in general a body or a mandrel portion to which are affixed spiraled blades which extend from the body portion to the diameter of the well bore. The plurality of blades are so arranged about the circumference of the tool body that when in engagement with the wall of the well bore spaces for circulation of mud and removal of cuttings and debris from the well are provided bet~een the blades. Typically three or four such blades are utilized and are equally spaced circumferentially about the tool body. The blades are generally spiraled or set at an angle with respect to the vertical axis of the drill string so that the plurality of the blades present a large arcuate bearing with the well bore wall.
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The stabilizer is subject to very great stresses during the drilling operation. The radially extending blades must be securely fastened to the stabilizer body to insure that the blades -! Will not break loose and necessitate an expensive and time consuming - 5 fishing job. However, in addition to the blades being securely affixed to the body, they should be mounted in a way permitting easy removal and replacement since the blades of the stabilizer are subject to wear and deterioration in use. It is another requirement of such drill collar blade stabilizers that the blades will not rotate relative to the tool body, i.e., that the blades are affixed -` thereto in such manner that they rotate with the drill string.
Another important consideration is the ease, simplicity, economy and reliability of manufacture. Prior art stabilizers . have been more expensive to manufacture and the manufacturing ~; 15 operation has been more complicated than desired.
Description of Prior Art ,, .
; Drill collar stabilizers have progressed from a solid boss type, through the rubber sleeve type to the integral blade ,~ stabilizer, which our available reference material indicates 20 was introduced about 1954. The replaceable sleeve type stabilizer consists of a mandrel with a replaceable stabilizing sleeve element installed on the mandrel. Previously the methods of !~, retaining the sleeve consisted of a shrink fit (sleeve heated and slipped onto the mandrel), threaded sleeve or threaded two piece mandrel, by welding, bolting or by a form of dovetail arrangement between the blade and body.
In U. S. Patent No. 3,645,587 to Bill G. Parker, patented February 29, 1972, a drill string stabilizer is shown.
A bottom hole stabilizer, or similar drill string member, is provided with three substantially straight longitudinal ribs on its surface, and the ribs are spaced apart to leave annular flow areas between rib sections. The member is formed as an integral construction by milling flat bottom grooves into a tubular blank
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having a circular outside periphery when viewed in cross section.
The flat bottom grooves are milled into the blank for a sufficient distance to provide substantial annular flow area while also leaving a relatively broad rib section between each annulus area.
The member is especially useful for packing a hole just above the drilling bit of a drill string.
In U. S. Patent No. 3,447,839 to Albert H. Salvatori, patented June 3, 1969, a drill string stabilizer is shown comprising a sleeve of longitudinally mating sections mounted on an elongated tubular body, wherein the sleeve has a protrusion extending into a mating indentation in a shoulder of the body preventing relative rotation therebetween.
In U. S. Patent No. 3,933,395 to Ernest G. Evans, patented January 20, 1976, a stabilizer is shown for a tubular string that ` 15 includes a tubular body with a sleeve split transversely which '~ forms two portions that fit on the body with means for securing the split sleeve on the body.
In U. S. Patent No. 3,754,609 to William R. Garrett, ~ -` patented August 28, 1973, a lower drill string assembly is shown useful in the rotary system of drilling oil wells wherein a tubular drill string is rotated while fluid is circulated down the string and up the earth bore includes tubular lower drill --string members, such as adjacent drill collars or two parts of a stabilizer body, interconnectable by a modified rotary shouldered connection including a mandrel between the pin shoulder and the screw, i.e., the box engaging part of the pin, and a fluid sealing, torque transmission sleeve around the mandrel between the pin shoulder and the shoulder formed by the box mouth. For safety, to avoid junking the well, means is provided to retain the sleeve on the mandrel, and the retention means, e.g., a peg and slot or loose fitting threads, allows relative axial movement of the sleeve and mandrel as required for stressing the sleeve and pin axially
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having a circular outside periphery when viewed in cross section.
The flat bottom grooves are milled into the blank for a sufficient distance to provide substantial annular flow area while also leaving a relatively broad rib section between each annulus area.
The member is especially useful for packing a hole just above the drilling bit of a drill string.
In U. S. Patent No. 3,447,839 to Albert H. Salvatori, patented June 3, 1969, a drill string stabilizer is shown comprising a sleeve of longitudinally mating sections mounted on an elongated tubular body, wherein the sleeve has a protrusion extending into a mating indentation in a shoulder of the body preventing relative rotation therebetween.
In U. S. Patent No. 3,933,395 to Ernest G. Evans, patented January 20, 1976, a stabilizer is shown for a tubular string that ` 15 includes a tubular body with a sleeve split transversely which '~ forms two portions that fit on the body with means for securing the split sleeve on the body.
In U. S. Patent No. 3,754,609 to William R. Garrett, ~ -` patented August 28, 1973, a lower drill string assembly is shown useful in the rotary system of drilling oil wells wherein a tubular drill string is rotated while fluid is circulated down the string and up the earth bore includes tubular lower drill --string members, such as adjacent drill collars or two parts of a stabilizer body, interconnectable by a modified rotary shouldered connection including a mandrel between the pin shoulder and the screw, i.e., the box engaging part of the pin, and a fluid sealing, torque transmission sleeve around the mandrel between the pin shoulder and the shoulder formed by the box mouth. For safety, to avoid junking the well, means is provided to retain the sleeve on the mandrel, and the retention means, e.g., a peg and slot or loose fitting threads, allows relative axial movement of the sleeve and mandrel as required for stressing the sleeve and pin axially
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, -sufficiently to transmit axial torque through the sleeve from pin shoulder to box shoulder, thereby reducing the torque load on the pin, as well as effecting a fluid tight seal. The sleeve performs an additional function of contacting the side of the well bore, e.g., as a replaceable wear resistant unit or as a replaceable centralizer and wear protector or fixed blade reamer-stabilizer, and the safety retention means can transmit torque to the sleeve from the mandrel. A special combination of hardfacings is provided on the blades of the - 10 reamer-stabilizer at the sides and ends thereof.
` Summary of the InventionThe present invention provides a simple effective removable sleeve blade type drill collar stabilizer. The present invention eliminates costly threading and machining and provides a replaceable sleeve drill collar stabilizer with an annular sleeve that can be easily and quickly replaced i without damage to the stabilizer's mandrel. -The present invention relates to a replaceable sleeve drill collar stabilizer haying a metal mandrel ;- 20 with a flow passage therethrough, the mandrel having a body portion and a first end and a second end. A replaceable sleeve is positioned about the body portion between the first and the second end, the replaceable sleeve including longitudinally extending sections with the sections being individually stablizer elements. Means is provided for preventing relative rotation between the replaceable sleeve and the body portion including a protruding element extending ~ from the sleeve into the mating indentation in the body ; portion of the mandrel with a weld for rigidly connecting the protruding element to the replaceable sleeve.
The small amount of welding does not affect the mandrel and is applied only to the replaceable sleeve and ~ -B ws~
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protruding locking element. Worn sleeve replacement is accomplished by removal of the small amount of weld joining the protruding locking element to the stabilizer sleeve.
According to another aspect of the present invention there is provided a method of contstructing an operating replaceable sleeve drill collar stabilizer for attachment to a drill string that is rotatable in a direction of rotation.
The method includes the steps ofproyiding a cylindrical one piece metal mandrel having an upper end and a lower end and providing a flow passageway extending through the metal , mandrel. A threaded box is provided at the upper end of the metal mandrel and a threaded pin is provided at the lower end of the metal mandrel. A generally cylindrical replaceable sleeve member is positioned around the one piece metal mandrel between the upper end and the lower end ! the sleeve member having a multiplicity of longitudinally extending and outwardly ;~
; projecting stablizer blades equally spaced around the replaceable sleeve member with the stablizer blades having a trailing side as the stabilizer rotates in the direction of rotation. A multiplicity of holes is provided which extend through the replaceable member by positioning the holes just behind the trailing side of the stablizer blades as the stablizer rotates in the direction of rotation. A multiplicity of recesses is provided in the one piece metal mandrel, and a multiplicity ofpinsis positioned extending respectively through the multiplicity of holes respectively in the multiplicity of recesses~ The multiplicity of pins is ., welded to the replaceable sleeve member thereby providing a ; weld connecting the sleeve member to the mandrel. The . 30 stabilizer is connected as an element of the drill string -and is used in a drilling operation. The drilling operation is interrupted and the weld connecting the multiplicity of pins . i - .
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to the replaceable sleeve member is removed. The pins are removed from the multiplicity of holes and the multiplicity of recesses and a new generally cylindrical replaceable sleeve member is positioned around the one piece metal mandrel between the upper end and the lower end. The sleeve has a multiplicity of longitudinally extending and outwardly projecting stablizer blades equally spaced around the replaceable sleeve member with the stabilizer blades having a trailing side as the stabilizer rotates in the direction of rotation. A multiplicity of new holes is provided extending through the new replaceable sleeve member by positioning the holes just behind the trailing side of the stabilizer blades as the stablizer rotates in the direction of rotation. A multiplicity of pins is positioned extending respectively through the multiplicity of new holes respectively in the multiplicity of recesses. The multiplicity of pins is welded to the replaceable sleeve member thereby providing a weld connecting the sleeve member to the mandrel. The stablizer is connected as an element to the drill string and is used in a drilling operation~
The above and other features and advantages of the present invention will become apparent from a consideration of the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Brief Description_of t~e Drawings Figure 1 is an illustration in elevation showing a drill collar stablizer assembly constructed in accordance with the present invention.
Figure 2 is an illustration in elevation showing another form of the present invention.
., ~ Figure 3 is an illustration in section showing ::' ~ a large scale of a portion of a drill collar stabilizer of ; the present invention.
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Detailed Description of the Invention Referring now to Figure 1, there is shown a presently preferred embodiment of a drill collar stabilizer constructed in accordance with the present invention. The ;~ purpose of the present invention is to provide a simple and effective system of locking a removable stabilizer blade sleeve ` to a mandrel. This system eliminates costly threading and machining. The small amount of welding utilized in the present invention does not affact the mandrel and is applied only to the replaceable sleeve and locking pin. Worn sleeve replacement is accomplished by removing the small amount ~--of weld joining the locking pin to the stabilizer sleeve.
Existing stabilizer designs are milled from solid stock and ~-have weld on blades or use a thread system for retaining a sleeve with blades. These systems are expensive and sometimes difficult to install and remove. They also incorporate the problem of backing off a threaded member prior to replacement of the sleeve. ~ -The drill collar stabilizer is shown as assembled. -It will be included as an element in a drill string and is designated generally by the reference numeral 10. The drill collar stabilizer ' ~ . ,- .
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10 includes a tubular externally cylindrical vertically extending tool body or mandrel 11 which is connectable into a rotary drill ; string. The upper and lower threaded ends of the mandrel 11 are s respectively the box end 12 and the pin end 13. Three well bore engaging members are provided in the form of angularly extending ~ stabilizer ribs generally designated 15, 15a and 15b respectively.
,~ They are circumferentially spaced about and integrally affixed to the outer surface of a replaceable sleeve 9. The replaceable sleeve 9 is in turn mounted upon the mandrel 11. The blades extend radially outward from the sleeve 9 to a diameter sufficient to engage the wall of the well bore to laterally stabilize and center the drill string. It is to be understood that the stabilizer 10 is connected into the drill string particularly between the drill collars for stabilizing, guiding or other purposes. A central passage 14 extends longitudinally through the mandrel 9 to communicate with similar passages in the elements of the drill ,- string for flowing drilling mud therethrough.
;, ~, The system shown in Figure 1 utilizes three holes or key slots in the replaceable sleeve 9 located to match holes or recesses 20 in the mandrel 11. The holes or key slots in the replaceable sleeve 9 include adequate weld grooves to receive weld material to secure - the locking pin in place. No detrimental welding is done on the mandrel 11. The stabilizer mandrel 11 is a tubular elongated element preferable formed of fiteel with an outside diameter substantially equal to the outside diameter of the adjoining drill ~i collars or other elements in the drill string. The length of the mandrel is greater than the length of the stabilizer sleeve 9 which in turn is somewhat greater in length than the blades 15, 15a and ' 15b which are in turn of the desired length common to other types ;:.
of drill blade stabilizers. Thus, in a typical stabilizer of one particular size the outside diameter of the mandrel 11 is 6-1/8 inches, the overall length is 83-1/4 inches, and the length of the ` 1Q90325 sleeve 9 is approximately 16-1/4 inches. The stabilizer blades 15, 15a and 15b on such a body would range in outside diameter from ~ 8-1/2 inches to 8-3/4 inches. Thus, in the illustrative tool the ; mandrel 11 would be greater than the length of the sleeve 9. The diameter of the section of the mandrel 11 is approximately equal - to the inside diameter of the sleeve 9. When in the assembled condition, the sleeve 9 will be closely fitted to the mandrel 11.
In accordance with the present invention, a plurality of blades or ribs are provided to occur on the exterior of the sleeve ' 10 9 such that when assembled the sleeve 9 and ribs 15, 15a and 15b conforms in outside diameter to the approximate diameter of the ` borehole. The blades or ribs project radially outward. The blades '~ may vary in number, form and design, but in the presently preferred embodiment, three such ribs 15, 15a and 15b are spaced 120 apart around the sleeve 9 and are pitched so that they are angularly disposed relative to the longitudinal axis of the tool 10 preferably at about 30 relative thereto. It is preferable that the several : blades be elongated elements of considerable length and also of substantial width. The blades are spaced a substantial distance -apart so that there are openings or channels between adjacent blades to provide adequate means for passage of fluid that must circulate past the blades. The blades can also urge fluid and cuttings out of the borehole. It is to be understood that the term "blades" is one common to the art and is employed herein although not necessarily meant to denote that the blades or ribs necessarily perform any cutting function in the well. It is their primary function, as discussed hereinbefore, to provide a bearing -surface with the borehole. Accordingly, in the illustrative -embodiment of the present invention each blade is elongated in configuration and generally rectangular in cross-sectional configuration so that it has a substantially flat top surface. The ; orientation and configuration of the blades 15, 15a and 15b relative to the sleeve 9 and the mandrel 11 is shown particularly in Figure 1.
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The blades are permanently affixed to the sleeve 9 and in the present embodiment are so affixed by forming them integrally there-with. The sleeve 9 forms an elongated cylinder as discussed hereinbefore having an inside diameter approximately equal to the outside diameter of the mandrel 11 and an outside diameter approximately equal to the borehole diameter.
Holes extend through the sleeve 9 between blades 15, 15a and 15b. The holes are located immediately adjacent the trailing side of blades 15, 15a and 15b. Looking from the top of the tool 10 down, the tool 10 will be rotated clockwise. The holes are therefore positioned just behind the blades 15, 15a and 15b considering this rotation. Locking pins 16, 17 and 18 extend ~- through the holes into mating recesses in the mandrel 11 for ~' positioning and retention both radially and axially the replaceable - 15 blade sleeve sub-assembly 9. The pins 16, 17 and 18 are connected to the sleeve 9 by welding. The holes or keyways in the blade sleeve sub-assembly 9 are aligned with the recesses in the mandrel ' section 11. The pins 16, 17 and 18 are then installed and welded ~; to the blade sleeve sub-assembly and not to the mandrel section.
The retention pins 16, 17 and 18 may be round, square or rectangular.
The location of the holes in the sleeve 9 reduces erosion of the weld during the arilling operation.
The present invention provides a simple method of retaining a sleeve which is easily installed or removed. It eliminates problems associated with heating or pressing on or off a sleeve installed with the shrink fit method. Costly rework or recutting of threads associated with the threaded sleeves and two piece - mandrels are eliminated. The sleeve of the present invention is retained on the mandrel by pins which are recessed into the mandrel and weldèd to the low carbon material of the sleeve. Advantages of the present invention over what was done before are:
1) an easily changeable sleeve that requires no special equipment, 1(:?903ZS
2) a one piece mandrel construction for added strength, 3) pins located in a relieved section of the sleeve to minimize wear,
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, -sufficiently to transmit axial torque through the sleeve from pin shoulder to box shoulder, thereby reducing the torque load on the pin, as well as effecting a fluid tight seal. The sleeve performs an additional function of contacting the side of the well bore, e.g., as a replaceable wear resistant unit or as a replaceable centralizer and wear protector or fixed blade reamer-stabilizer, and the safety retention means can transmit torque to the sleeve from the mandrel. A special combination of hardfacings is provided on the blades of the - 10 reamer-stabilizer at the sides and ends thereof.
` Summary of the InventionThe present invention provides a simple effective removable sleeve blade type drill collar stabilizer. The present invention eliminates costly threading and machining and provides a replaceable sleeve drill collar stabilizer with an annular sleeve that can be easily and quickly replaced i without damage to the stabilizer's mandrel. -The present invention relates to a replaceable sleeve drill collar stabilizer haying a metal mandrel ;- 20 with a flow passage therethrough, the mandrel having a body portion and a first end and a second end. A replaceable sleeve is positioned about the body portion between the first and the second end, the replaceable sleeve including longitudinally extending sections with the sections being individually stablizer elements. Means is provided for preventing relative rotation between the replaceable sleeve and the body portion including a protruding element extending ~ from the sleeve into the mating indentation in the body ; portion of the mandrel with a weld for rigidly connecting the protruding element to the replaceable sleeve.
The small amount of welding does not affect the mandrel and is applied only to the replaceable sleeve and ~ -B ws~
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protruding locking element. Worn sleeve replacement is accomplished by removal of the small amount of weld joining the protruding locking element to the stabilizer sleeve.
According to another aspect of the present invention there is provided a method of contstructing an operating replaceable sleeve drill collar stabilizer for attachment to a drill string that is rotatable in a direction of rotation.
The method includes the steps ofproyiding a cylindrical one piece metal mandrel having an upper end and a lower end and providing a flow passageway extending through the metal , mandrel. A threaded box is provided at the upper end of the metal mandrel and a threaded pin is provided at the lower end of the metal mandrel. A generally cylindrical replaceable sleeve member is positioned around the one piece metal mandrel between the upper end and the lower end ! the sleeve member having a multiplicity of longitudinally extending and outwardly ;~
; projecting stablizer blades equally spaced around the replaceable sleeve member with the stablizer blades having a trailing side as the stabilizer rotates in the direction of rotation. A multiplicity of holes is provided which extend through the replaceable member by positioning the holes just behind the trailing side of the stablizer blades as the stablizer rotates in the direction of rotation. A multiplicity of recesses is provided in the one piece metal mandrel, and a multiplicity ofpinsis positioned extending respectively through the multiplicity of holes respectively in the multiplicity of recesses~ The multiplicity of pins is ., welded to the replaceable sleeve member thereby providing a ; weld connecting the sleeve member to the mandrel. The . 30 stabilizer is connected as an element of the drill string -and is used in a drilling operation. The drilling operation is interrupted and the weld connecting the multiplicity of pins . i - .
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to the replaceable sleeve member is removed. The pins are removed from the multiplicity of holes and the multiplicity of recesses and a new generally cylindrical replaceable sleeve member is positioned around the one piece metal mandrel between the upper end and the lower end. The sleeve has a multiplicity of longitudinally extending and outwardly projecting stablizer blades equally spaced around the replaceable sleeve member with the stabilizer blades having a trailing side as the stabilizer rotates in the direction of rotation. A multiplicity of new holes is provided extending through the new replaceable sleeve member by positioning the holes just behind the trailing side of the stabilizer blades as the stablizer rotates in the direction of rotation. A multiplicity of pins is positioned extending respectively through the multiplicity of new holes respectively in the multiplicity of recesses. The multiplicity of pins is welded to the replaceable sleeve member thereby providing a weld connecting the sleeve member to the mandrel. The stablizer is connected as an element to the drill string and is used in a drilling operation~
The above and other features and advantages of the present invention will become apparent from a consideration of the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Brief Description_of t~e Drawings Figure 1 is an illustration in elevation showing a drill collar stablizer assembly constructed in accordance with the present invention.
Figure 2 is an illustration in elevation showing another form of the present invention.
., ~ Figure 3 is an illustration in section showing ::' ~ a large scale of a portion of a drill collar stabilizer of ; the present invention.
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Detailed Description of the Invention Referring now to Figure 1, there is shown a presently preferred embodiment of a drill collar stabilizer constructed in accordance with the present invention. The ;~ purpose of the present invention is to provide a simple and effective system of locking a removable stabilizer blade sleeve ` to a mandrel. This system eliminates costly threading and machining. The small amount of welding utilized in the present invention does not affact the mandrel and is applied only to the replaceable sleeve and locking pin. Worn sleeve replacement is accomplished by removing the small amount ~--of weld joining the locking pin to the stabilizer sleeve.
Existing stabilizer designs are milled from solid stock and ~-have weld on blades or use a thread system for retaining a sleeve with blades. These systems are expensive and sometimes difficult to install and remove. They also incorporate the problem of backing off a threaded member prior to replacement of the sleeve. ~ -The drill collar stabilizer is shown as assembled. -It will be included as an element in a drill string and is designated generally by the reference numeral 10. The drill collar stabilizer ' ~ . ,- .
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10 includes a tubular externally cylindrical vertically extending tool body or mandrel 11 which is connectable into a rotary drill ; string. The upper and lower threaded ends of the mandrel 11 are s respectively the box end 12 and the pin end 13. Three well bore engaging members are provided in the form of angularly extending ~ stabilizer ribs generally designated 15, 15a and 15b respectively.
,~ They are circumferentially spaced about and integrally affixed to the outer surface of a replaceable sleeve 9. The replaceable sleeve 9 is in turn mounted upon the mandrel 11. The blades extend radially outward from the sleeve 9 to a diameter sufficient to engage the wall of the well bore to laterally stabilize and center the drill string. It is to be understood that the stabilizer 10 is connected into the drill string particularly between the drill collars for stabilizing, guiding or other purposes. A central passage 14 extends longitudinally through the mandrel 9 to communicate with similar passages in the elements of the drill ,- string for flowing drilling mud therethrough.
;, ~, The system shown in Figure 1 utilizes three holes or key slots in the replaceable sleeve 9 located to match holes or recesses 20 in the mandrel 11. The holes or key slots in the replaceable sleeve 9 include adequate weld grooves to receive weld material to secure - the locking pin in place. No detrimental welding is done on the mandrel 11. The stabilizer mandrel 11 is a tubular elongated element preferable formed of fiteel with an outside diameter substantially equal to the outside diameter of the adjoining drill ~i collars or other elements in the drill string. The length of the mandrel is greater than the length of the stabilizer sleeve 9 which in turn is somewhat greater in length than the blades 15, 15a and ' 15b which are in turn of the desired length common to other types ;:.
of drill blade stabilizers. Thus, in a typical stabilizer of one particular size the outside diameter of the mandrel 11 is 6-1/8 inches, the overall length is 83-1/4 inches, and the length of the ` 1Q90325 sleeve 9 is approximately 16-1/4 inches. The stabilizer blades 15, 15a and 15b on such a body would range in outside diameter from ~ 8-1/2 inches to 8-3/4 inches. Thus, in the illustrative tool the ; mandrel 11 would be greater than the length of the sleeve 9. The diameter of the section of the mandrel 11 is approximately equal - to the inside diameter of the sleeve 9. When in the assembled condition, the sleeve 9 will be closely fitted to the mandrel 11.
In accordance with the present invention, a plurality of blades or ribs are provided to occur on the exterior of the sleeve ' 10 9 such that when assembled the sleeve 9 and ribs 15, 15a and 15b conforms in outside diameter to the approximate diameter of the ` borehole. The blades or ribs project radially outward. The blades '~ may vary in number, form and design, but in the presently preferred embodiment, three such ribs 15, 15a and 15b are spaced 120 apart around the sleeve 9 and are pitched so that they are angularly disposed relative to the longitudinal axis of the tool 10 preferably at about 30 relative thereto. It is preferable that the several : blades be elongated elements of considerable length and also of substantial width. The blades are spaced a substantial distance -apart so that there are openings or channels between adjacent blades to provide adequate means for passage of fluid that must circulate past the blades. The blades can also urge fluid and cuttings out of the borehole. It is to be understood that the term "blades" is one common to the art and is employed herein although not necessarily meant to denote that the blades or ribs necessarily perform any cutting function in the well. It is their primary function, as discussed hereinbefore, to provide a bearing -surface with the borehole. Accordingly, in the illustrative -embodiment of the present invention each blade is elongated in configuration and generally rectangular in cross-sectional configuration so that it has a substantially flat top surface. The ; orientation and configuration of the blades 15, 15a and 15b relative to the sleeve 9 and the mandrel 11 is shown particularly in Figure 1.
., .
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The blades are permanently affixed to the sleeve 9 and in the present embodiment are so affixed by forming them integrally there-with. The sleeve 9 forms an elongated cylinder as discussed hereinbefore having an inside diameter approximately equal to the outside diameter of the mandrel 11 and an outside diameter approximately equal to the borehole diameter.
Holes extend through the sleeve 9 between blades 15, 15a and 15b. The holes are located immediately adjacent the trailing side of blades 15, 15a and 15b. Looking from the top of the tool 10 down, the tool 10 will be rotated clockwise. The holes are therefore positioned just behind the blades 15, 15a and 15b considering this rotation. Locking pins 16, 17 and 18 extend ~- through the holes into mating recesses in the mandrel 11 for ~' positioning and retention both radially and axially the replaceable - 15 blade sleeve sub-assembly 9. The pins 16, 17 and 18 are connected to the sleeve 9 by welding. The holes or keyways in the blade sleeve sub-assembly 9 are aligned with the recesses in the mandrel ' section 11. The pins 16, 17 and 18 are then installed and welded ~; to the blade sleeve sub-assembly and not to the mandrel section.
The retention pins 16, 17 and 18 may be round, square or rectangular.
The location of the holes in the sleeve 9 reduces erosion of the weld during the arilling operation.
The present invention provides a simple method of retaining a sleeve which is easily installed or removed. It eliminates problems associated with heating or pressing on or off a sleeve installed with the shrink fit method. Costly rework or recutting of threads associated with the threaded sleeves and two piece - mandrels are eliminated. The sleeve of the present invention is retained on the mandrel by pins which are recessed into the mandrel and weldèd to the low carbon material of the sleeve. Advantages of the present invention over what was done before are:
1) an easily changeable sleeve that requires no special equipment, 1(:?903ZS
2) a one piece mandrel construction for added strength, 3) pins located in a relieved section of the sleeve to minimize wear,
4) welding is not required on the critical material of the mandrel,
5) the elimination of costly threaded connections, -
6) positive shoulder on the upper end of the sleeve to eliminate axial shear on the pins, and
7) low torque feature on the leading edge of blade.
Referring now to Figure 2, another embodiment of a drill collar stabilizer constructed in accordance with the present inven-tion is shown. The drill collar stabilizer will be included as an element in a drill string and is designated generally by the reference numeral 19 in Figure 2. The drill collar stabilizer 19 ' includes a tubular externally cylindrical vertically extending tool body or mandrel 21 which is connectable into a rotary drill string. The upper and lower threaded ends of the mandrel 21 are respectively the box end 20 and the pin end 24. Three well bore engaging members are provided in the form of angularly extending stabilizer ribs generally designated 22, 22a and 22b respectively.
They are circumferentially spaced about and integrally affixed to the outer surface of a replaceable sleeve 8. The replaceable sleeve 8 is in turn mounted upon the mandrel 21. The blades extend radially outward from the sleeve 8 to a diameter sufficient to engage the wall of the well bore to laterally stabilize and center the drill string. It is to be understood that the stabilizer is connected into the drill string particularly between the drill col~rs for stabilizing, guiding or other purposes. A central passage 23 extends longitudinally through the mandrel 8 to ~ :
.'~,' " ' '- '' ~ .
1(~903ZS
communicate with similar passages in the elements of the drill string for flowing drilling mud therethrough.
The present system utilizes three holes or key slots in the replaceable sleeve 8 located to match holes or recesses in the mandrel 21. The holes or key slots in the replaceable sleeve 8 are equipped with adequate weld grooves to receive weld material.
No detrimental welding is done on the mandrel 21. The stabilizer mandrel 21 is a tubular elongated element preferably formed of steel with an outside diameter substantially equal to the outside ~ 10 diameter of the adjoining drill collars or other elements in the drill string. The plurality of blades or ribs are provided on the - exterior of the sleeve 8. When assembled the sleeve 8 and ribs 22, 22a and 22b conform in outside diameter to the approximate diameter of the borehole. The blades or ribs project radially - -outward. The blades may vary in number, form and design, but in the embodiment shown three such ribs are spaced 120 apart around the sleeve 8 and are pitched so that they are angularly disposed relative to the longitudinal axis of the tool 10 preferably at about 30 relative thereto. The blades are spaced a substantial distance apart so that there are openings or channels between adjacent blades to provide adequate means for passage of fluid that must circulate past the blades and to assist in fluid circulation and cuttings removal.
A shoulder 28 is located on the upper portion of the mandrel 21. The shoulder 28 has an external diameter that is greater than the internal diameter of the sleeve 8. The sleeve is positioned over the mandrel 8 from the pin end 24. Holes ; extend through the sleeve 8 between blades 22, 22a and 22b. The holes are located immediately adjacent the trailing side of the 3Q blades. Looking from the top of the tool 19 down, the tool 19 will be rotated clockwise. The holes are therefore positioned just - behind the blades 22, 22a and 22b considering this rotation.
Locking pins 25, 26 and 27 extend through the holes into mating /
1()903ZS
, recesses in the mandrel 21 for positioning and retention both radially and axially the replaceable blade sleeve sub-assembly.
The shoulder 28 also provides retention axially to prevent the sleeve 8 from moving upward on the mandrel 21. The pins 25, 26 and 27 are connected to the sleeve 8 by welding. The holes or keyways in the blade sleeve sub-assembly 8 are aligned with the recesses in the mandrel section 21. The pins are then installed and welded to the blade sleeve sub-assembly 21 and not to the mandrel section 8. The retention pins 25, 26 and 27 may be round, square or rectangular. The location of the holes in the sleeve 8 reduces erosion of the weld during the drilling operation.
Referring now to Figure 3, an enlarged sectional view of a portion of a drill collar stabilizer constructed in accordance with the present invention is shown. The drill collar stabilizer is designated generally by the reference numeral 29. The stabilizer 29 is connected into the drill string particularly between the drill collars for stabilizing, guiding or other purposes. A central passage extends longitudinally through the stabilizer 29 to communicate with similar passages in the elements of the string for flowing drilling mud therethrough. A well bore engaging member is provided in the form of an angularly extending stabilizer rib 32. The rib or blade 32 is integrally affixed to the outer surface of a replaceable sleeve 31. The replaceable sleeve 31 is in turn mounted upon the mandrel 30. The blade 32 extends radially outward from the sleeve 31 to a diameter sufficient to engage the wall of the well bore to laterally stabilize and center the drill string.
A hole 34 in the replaceable sleeve 31 is located to match a hole or recess 33 in the mandrel 30. The hole 34 in the replaceable sleeve 31 includes a weld groove 37 to receive weld material 36 to secure a locking pin 35 in place. No detrimental welding is done on the mandrel 30. The hole 34 is located immediately adjacent the trailing side of blade 32. Looking from , . ~ ' 3~5 the top of the tool 29 down, the tool 29 will be rotated clockwise.
The hole 34 is positioned just behind one of the blades 32. The locking pin 35 extends through the hole 34 into the mating recess 33 in the mandrel 30 for positioning and retention both radially ` 5 and axially the replaceable blade sleeve sub-assembly. The pin 35 is connected to the sleeve 31 by the weld material 36. The hole 34 in the blade sleeve sub-assembly is aligned with the recess 33 in the mandrel section 30. The pin 35 is installed and welded to the blade sleeve sub-assembly 31 and not to the mandrel section 3Q. The present invention provides a simple and effective system of locking the removable stabilizer blade sleeve 31 to the mandrel 30. This system eliminates costly threading and machining. The small amount of welding utilized in the present invention does not ' affect the mandrel and is applied only to the replaceable sleeve.
Worn sleeve replacement is accomplished by removing the small amount of weld joining the pin to the stabilizer sleeve.
:' . .
Referring now to Figure 2, another embodiment of a drill collar stabilizer constructed in accordance with the present inven-tion is shown. The drill collar stabilizer will be included as an element in a drill string and is designated generally by the reference numeral 19 in Figure 2. The drill collar stabilizer 19 ' includes a tubular externally cylindrical vertically extending tool body or mandrel 21 which is connectable into a rotary drill string. The upper and lower threaded ends of the mandrel 21 are respectively the box end 20 and the pin end 24. Three well bore engaging members are provided in the form of angularly extending stabilizer ribs generally designated 22, 22a and 22b respectively.
They are circumferentially spaced about and integrally affixed to the outer surface of a replaceable sleeve 8. The replaceable sleeve 8 is in turn mounted upon the mandrel 21. The blades extend radially outward from the sleeve 8 to a diameter sufficient to engage the wall of the well bore to laterally stabilize and center the drill string. It is to be understood that the stabilizer is connected into the drill string particularly between the drill col~rs for stabilizing, guiding or other purposes. A central passage 23 extends longitudinally through the mandrel 8 to ~ :
.'~,' " ' '- '' ~ .
1(~903ZS
communicate with similar passages in the elements of the drill string for flowing drilling mud therethrough.
The present system utilizes three holes or key slots in the replaceable sleeve 8 located to match holes or recesses in the mandrel 21. The holes or key slots in the replaceable sleeve 8 are equipped with adequate weld grooves to receive weld material.
No detrimental welding is done on the mandrel 21. The stabilizer mandrel 21 is a tubular elongated element preferably formed of steel with an outside diameter substantially equal to the outside ~ 10 diameter of the adjoining drill collars or other elements in the drill string. The plurality of blades or ribs are provided on the - exterior of the sleeve 8. When assembled the sleeve 8 and ribs 22, 22a and 22b conform in outside diameter to the approximate diameter of the borehole. The blades or ribs project radially - -outward. The blades may vary in number, form and design, but in the embodiment shown three such ribs are spaced 120 apart around the sleeve 8 and are pitched so that they are angularly disposed relative to the longitudinal axis of the tool 10 preferably at about 30 relative thereto. The blades are spaced a substantial distance apart so that there are openings or channels between adjacent blades to provide adequate means for passage of fluid that must circulate past the blades and to assist in fluid circulation and cuttings removal.
A shoulder 28 is located on the upper portion of the mandrel 21. The shoulder 28 has an external diameter that is greater than the internal diameter of the sleeve 8. The sleeve is positioned over the mandrel 8 from the pin end 24. Holes ; extend through the sleeve 8 between blades 22, 22a and 22b. The holes are located immediately adjacent the trailing side of the 3Q blades. Looking from the top of the tool 19 down, the tool 19 will be rotated clockwise. The holes are therefore positioned just - behind the blades 22, 22a and 22b considering this rotation.
Locking pins 25, 26 and 27 extend through the holes into mating /
1()903ZS
, recesses in the mandrel 21 for positioning and retention both radially and axially the replaceable blade sleeve sub-assembly.
The shoulder 28 also provides retention axially to prevent the sleeve 8 from moving upward on the mandrel 21. The pins 25, 26 and 27 are connected to the sleeve 8 by welding. The holes or keyways in the blade sleeve sub-assembly 8 are aligned with the recesses in the mandrel section 21. The pins are then installed and welded to the blade sleeve sub-assembly 21 and not to the mandrel section 8. The retention pins 25, 26 and 27 may be round, square or rectangular. The location of the holes in the sleeve 8 reduces erosion of the weld during the drilling operation.
Referring now to Figure 3, an enlarged sectional view of a portion of a drill collar stabilizer constructed in accordance with the present invention is shown. The drill collar stabilizer is designated generally by the reference numeral 29. The stabilizer 29 is connected into the drill string particularly between the drill collars for stabilizing, guiding or other purposes. A central passage extends longitudinally through the stabilizer 29 to communicate with similar passages in the elements of the string for flowing drilling mud therethrough. A well bore engaging member is provided in the form of an angularly extending stabilizer rib 32. The rib or blade 32 is integrally affixed to the outer surface of a replaceable sleeve 31. The replaceable sleeve 31 is in turn mounted upon the mandrel 30. The blade 32 extends radially outward from the sleeve 31 to a diameter sufficient to engage the wall of the well bore to laterally stabilize and center the drill string.
A hole 34 in the replaceable sleeve 31 is located to match a hole or recess 33 in the mandrel 30. The hole 34 in the replaceable sleeve 31 includes a weld groove 37 to receive weld material 36 to secure a locking pin 35 in place. No detrimental welding is done on the mandrel 30. The hole 34 is located immediately adjacent the trailing side of blade 32. Looking from , . ~ ' 3~5 the top of the tool 29 down, the tool 29 will be rotated clockwise.
The hole 34 is positioned just behind one of the blades 32. The locking pin 35 extends through the hole 34 into the mating recess 33 in the mandrel 30 for positioning and retention both radially ` 5 and axially the replaceable blade sleeve sub-assembly. The pin 35 is connected to the sleeve 31 by the weld material 36. The hole 34 in the blade sleeve sub-assembly is aligned with the recess 33 in the mandrel section 30. The pin 35 is installed and welded to the blade sleeve sub-assembly 31 and not to the mandrel section 3Q. The present invention provides a simple and effective system of locking the removable stabilizer blade sleeve 31 to the mandrel 30. This system eliminates costly threading and machining. The small amount of welding utilized in the present invention does not ' affect the mandrel and is applied only to the replaceable sleeve.
Worn sleeve replacement is accomplished by removing the small amount of weld joining the pin to the stabilizer sleeve.
:' . .
Claims (7)
1. A replaceable sleeve drill collar stabilizer, comprising:
a metal mandrel having a flow passage therethrough, said mandrel having a body portion;
a replaceable sleeve unit positioned around said mandrel, said unit having a body portion with a central passage extending therethrough with a diameter sufficient to receive said metal mandrel, longitudinally extending individual stabilizer elements projecting radially outward from said body portion and at least one opening extending radially through said body portion; and means for preventing relative rotation between said replaceable sleeve unit and said mandrel including a pin element extending through said opening in said sleeve unit into a mating indentation in the body portion of said mandrel and a weld for rigidly connecting said pin element to said replaceable sleeve unit.
a metal mandrel having a flow passage therethrough, said mandrel having a body portion;
a replaceable sleeve unit positioned around said mandrel, said unit having a body portion with a central passage extending therethrough with a diameter sufficient to receive said metal mandrel, longitudinally extending individual stabilizer elements projecting radially outward from said body portion and at least one opening extending radially through said body portion; and means for preventing relative rotation between said replaceable sleeve unit and said mandrel including a pin element extending through said opening in said sleeve unit into a mating indentation in the body portion of said mandrel and a weld for rigidly connecting said pin element to said replaceable sleeve unit.
2. A replaceable sleeve drill collar stabilizer, comprising:
a metal mandrel having a flow passage therethrough, said mandrel having a body portion and a first end and a second end;
a replaceable sleeve positioned about said body portion between said first end and said second end, said replaceable sleeve including longitudinally extending sections with said sections being individual stabilizer elements; and means for preventing relative rotation between said replaceable sleeve and said body portion including a protruding element extending from said sleeve into a mating indentation in the body portion of said mandrel and a weld for rigidly connecting said protruding element to said replaceable sleeve.
a metal mandrel having a flow passage therethrough, said mandrel having a body portion and a first end and a second end;
a replaceable sleeve positioned about said body portion between said first end and said second end, said replaceable sleeve including longitudinally extending sections with said sections being individual stabilizer elements; and means for preventing relative rotation between said replaceable sleeve and said body portion including a protruding element extending from said sleeve into a mating indentation in the body portion of said mandrel and a weld for rigidly connecting said protruding element to said replaceable sleeve.
3. A replaceable sleeve drill collar stabilizer, comprising:
a metal mandrel having a flow passage therethrough, said mandrel having a body portion and a first end and a second end, with a threaded box at said first end and a threaded pin at said second end;
a replaceable sleeve positioned about said body portion between said first end and said second end, said replaceable sleeve including longitudinally extending sections with said sections being individual stabilizer elements; and means for preventing relative rotation between said replaceable sleeve and said body portion including an opening in said sleeve, a mating indentation in said body portion and a pin element extending through said opening in said sleeve into said mating indentation in said body portion and a weld for rigidly connecting said pin element to said replaceable sleeve.
a metal mandrel having a flow passage therethrough, said mandrel having a body portion and a first end and a second end, with a threaded box at said first end and a threaded pin at said second end;
a replaceable sleeve positioned about said body portion between said first end and said second end, said replaceable sleeve including longitudinally extending sections with said sections being individual stabilizer elements; and means for preventing relative rotation between said replaceable sleeve and said body portion including an opening in said sleeve, a mating indentation in said body portion and a pin element extending through said opening in said sleeve into said mating indentation in said body portion and a weld for rigidly connecting said pin element to said replaceable sleeve.
4. A replaceable sleeve drill collar stabilizer, comprising:
a metal mandrel having an upper end and a lower end;
a flow passage extending through said metal mandrel;
a threaded box at the upper end of said metal mandrel;
a threaded pin at the lower end of said metal mandrel;
a replaceable sleeve positioned about said metal mandrel between said upper end and said lower end;
a multiplicity of longitudinally extending individual stabilizer elements equally spaced around said replaceable sleeve;
a multiplicity of holes extending through said replaceable sleeve;
a multiplicity of indentations in said metal mandrel;
a multiplicity of pins extending respectively through said multiplicity of holes respectively into said multiplicity of indentations; and weld means for rigidly connecting said multiplicity of pins to said replaceable sleeve.
a metal mandrel having an upper end and a lower end;
a flow passage extending through said metal mandrel;
a threaded box at the upper end of said metal mandrel;
a threaded pin at the lower end of said metal mandrel;
a replaceable sleeve positioned about said metal mandrel between said upper end and said lower end;
a multiplicity of longitudinally extending individual stabilizer elements equally spaced around said replaceable sleeve;
a multiplicity of holes extending through said replaceable sleeve;
a multiplicity of indentations in said metal mandrel;
a multiplicity of pins extending respectively through said multiplicity of holes respectively into said multiplicity of indentations; and weld means for rigidly connecting said multiplicity of pins to said replaceable sleeve.
5. A replaceable sleeve drill collar stabilizer, comprising:
a metal mandrel having an upper end and a lower end;
a flow passage extending through said metal mandrel;
a threaded box at the upper end of said metal mandrel;
a threaded pin at the lower end of said metal mandrel;
a replaceable sleeve positioned about said metal mandrel between said upper end and said lower end;
a shoulder means positioned between said sleeve and said upper end for contacting said sleeve;
three longitudinally extending individual stabilizer elements equally spaced around said replaceable sleeve;
three holes extending through said replaceable sleeve;
three indentations in said metal mandrel;
three pins extending respectively through said three holes respectively into said three indentations; and weld means for rigidly connecting said three pins to said replaceable sleeve.
a metal mandrel having an upper end and a lower end;
a flow passage extending through said metal mandrel;
a threaded box at the upper end of said metal mandrel;
a threaded pin at the lower end of said metal mandrel;
a replaceable sleeve positioned about said metal mandrel between said upper end and said lower end;
a shoulder means positioned between said sleeve and said upper end for contacting said sleeve;
three longitudinally extending individual stabilizer elements equally spaced around said replaceable sleeve;
three holes extending through said replaceable sleeve;
three indentations in said metal mandrel;
three pins extending respectively through said three holes respectively into said three indentations; and weld means for rigidly connecting said three pins to said replaceable sleeve.
6. A replaceable sleeve drill collar stabilizer for rotation in a direction of rotation, comprising:
a cylindrical one piece metal mandrel having an upper end and a lower end;
a flow passage extending through said metal mandrel;
a threaded box at the upper end of said metal mandrel;
a threaded pin at the lower end of said metal mandrel;
a generally cylindrical replaceable sleeve member positioned around said one piece metal mandrel between said upper end and said lower end;
a multiplicity of longitudinally extending and outwardly projecting stabilizer blades equally spaced around said replaceable sleeve member, said stabilizer blades having a trailing side as said stabilizer rotates in said direction of rotation;
a multiplicity of holes extending through said replaceable sleeve member, said multiplicity of holes positioned just behind the trailing side of said stabilizer blades as said stabilizer rotates in said direction of rotation;
a multiplicity of recesses in said one piece metal mandrel;
a multiplicity of pins extending respectively through said multiplicity of holes respectively into said multiplicity of recesses; and weld means for rigidly connecting said multiplicity of pins only to said replaceable sleeve member.
a cylindrical one piece metal mandrel having an upper end and a lower end;
a flow passage extending through said metal mandrel;
a threaded box at the upper end of said metal mandrel;
a threaded pin at the lower end of said metal mandrel;
a generally cylindrical replaceable sleeve member positioned around said one piece metal mandrel between said upper end and said lower end;
a multiplicity of longitudinally extending and outwardly projecting stabilizer blades equally spaced around said replaceable sleeve member, said stabilizer blades having a trailing side as said stabilizer rotates in said direction of rotation;
a multiplicity of holes extending through said replaceable sleeve member, said multiplicity of holes positioned just behind the trailing side of said stabilizer blades as said stabilizer rotates in said direction of rotation;
a multiplicity of recesses in said one piece metal mandrel;
a multiplicity of pins extending respectively through said multiplicity of holes respectively into said multiplicity of recesses; and weld means for rigidly connecting said multiplicity of pins only to said replaceable sleeve member.
7. A method of constructing and operating a replaceable sleeve drill collar stabilizer for attachment to a drill string that is rotated in a direction of rotation, comprising the steps of:
providing a cylindrical one piece metal mandrel having an upper end and a lower end;
providing a flow passage extending through said metal mandrel;
providing a threaded box at the upper end of said metal mandrel;
providing a threaded pin at the lower end of said metal mandrel;
positioning a generally cylindrical replaceable sleeve member around said one piece metal mandrel between said upper end and said lower end, said sleeve member having a multiplicity of longitudinally extending and outwardly projecting stabilizer blades equally spaced around said replaceable sleeve member with said stabilizer blades having a trailing side as said stabilizer rotates in said direction of rotation;
providing a multiplicity of holes extending through said replaceable sleeve member by positioning said holes just behind the trailing side of said stabilizer blades as said stabilizer rotates in said direction of rotation;
providing a multiplicity of recesses in said one piece metal mandrel;
positioning a multiplicity of pins extending respectively through said multiplicity of holes respectively into said multiplicity of recesses;
welding said multiplicity of pins to said replaceable sleeve member thereby providing a weld connecting said sleeve member to said mandrel;
connecting said stabilizer as an element of said drill string and using it in a drilling operation;
interrupting said drilling operation and removing the weld connecting said multiplicity of pins to said replaceable sleeve member;
removing said pins from said multiplicity of holes and said multiplicity of recesses;
positioning a new generally cylindrical replaceable sleeve member around said one piece metal mandrel between said upper end and said lower end, said sleeve member having a multiplicity of longitudinally extending and outwardly projecting stabilizer blades equally spaced around said replaceable sleeve member with said stabilizer blades having a trailing side as said stabilizer rotates in said direction of rotation;
providing a multiplicity of new holes extending through said new replaceable sleeve member by positioning said holes just behind the trailing side of said stabilizer blades as said stabilizer rotates in said direction of rotation;
positioning a multiplicity of pins extending respectively through said multiplicity of new holes respectively into said multiplicity of recesses;
welding said multiplicity of pins to said replaceable sleeve member thereby providing a weld connecting said sleeve member to said mandrel; and connecting said stabilizer as an element of said drill string and using it in a drilling operation.
providing a cylindrical one piece metal mandrel having an upper end and a lower end;
providing a flow passage extending through said metal mandrel;
providing a threaded box at the upper end of said metal mandrel;
providing a threaded pin at the lower end of said metal mandrel;
positioning a generally cylindrical replaceable sleeve member around said one piece metal mandrel between said upper end and said lower end, said sleeve member having a multiplicity of longitudinally extending and outwardly projecting stabilizer blades equally spaced around said replaceable sleeve member with said stabilizer blades having a trailing side as said stabilizer rotates in said direction of rotation;
providing a multiplicity of holes extending through said replaceable sleeve member by positioning said holes just behind the trailing side of said stabilizer blades as said stabilizer rotates in said direction of rotation;
providing a multiplicity of recesses in said one piece metal mandrel;
positioning a multiplicity of pins extending respectively through said multiplicity of holes respectively into said multiplicity of recesses;
welding said multiplicity of pins to said replaceable sleeve member thereby providing a weld connecting said sleeve member to said mandrel;
connecting said stabilizer as an element of said drill string and using it in a drilling operation;
interrupting said drilling operation and removing the weld connecting said multiplicity of pins to said replaceable sleeve member;
removing said pins from said multiplicity of holes and said multiplicity of recesses;
positioning a new generally cylindrical replaceable sleeve member around said one piece metal mandrel between said upper end and said lower end, said sleeve member having a multiplicity of longitudinally extending and outwardly projecting stabilizer blades equally spaced around said replaceable sleeve member with said stabilizer blades having a trailing side as said stabilizer rotates in said direction of rotation;
providing a multiplicity of new holes extending through said new replaceable sleeve member by positioning said holes just behind the trailing side of said stabilizer blades as said stabilizer rotates in said direction of rotation;
positioning a multiplicity of pins extending respectively through said multiplicity of new holes respectively into said multiplicity of recesses;
welding said multiplicity of pins to said replaceable sleeve member thereby providing a weld connecting said sleeve member to said mandrel; and connecting said stabilizer as an element of said drill string and using it in a drilling operation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US91161778A | 1978-06-01 | 1978-06-01 | |
| US911,617 | 1978-06-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1090325A true CA1090325A (en) | 1980-11-25 |
Family
ID=25430569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA326,881A Expired CA1090325A (en) | 1978-06-01 | 1979-05-03 | Replaceable sleeve drill collar stabilizer |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1090325A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4379494A (en) * | 1981-10-05 | 1983-04-12 | International Petroleum Engineering Corporation | Replaceable drill stabilizer sleeve |
| US4600063A (en) * | 1984-05-29 | 1986-07-15 | Dailey Petroleum Services Corp. | Double-taper slip-on drill string stabilizer |
| US4630690A (en) * | 1985-07-12 | 1986-12-23 | Dailey Petroleum Services Corp. | Spiralling tapered slip-on drill string stabilizer |
| CN109403881A (en) * | 2018-12-26 | 2019-03-01 | 济源微浪石油设备有限公司 | Interchangeable straight wing stabilizer |
-
1979
- 1979-05-03 CA CA326,881A patent/CA1090325A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4379494A (en) * | 1981-10-05 | 1983-04-12 | International Petroleum Engineering Corporation | Replaceable drill stabilizer sleeve |
| US4600063A (en) * | 1984-05-29 | 1986-07-15 | Dailey Petroleum Services Corp. | Double-taper slip-on drill string stabilizer |
| US4630690A (en) * | 1985-07-12 | 1986-12-23 | Dailey Petroleum Services Corp. | Spiralling tapered slip-on drill string stabilizer |
| CN109403881A (en) * | 2018-12-26 | 2019-03-01 | 济源微浪石油设备有限公司 | Interchangeable straight wing stabilizer |
| CN109403881B (en) * | 2018-12-26 | 2023-12-26 | 济源微浪石油设备有限公司 | Stabilizer with replaceable straight wings |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |