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Publication numberUS3301324 A
Publication typeGrant
Publication dateJan 31, 1967
Filing dateJun 12, 1964
Priority dateJun 12, 1964
Publication numberUS 3301324 A, US 3301324A, US-A-3301324, US3301324 A, US3301324A
InventorsSmith Samuel H
Original AssigneeA 1 Bit & Tool Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Swivel for supporting drill string in submerged casing head
US 3301324 A
Abstract  available in
Images(2)
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Claims  available in
Description  (OCR text may contain errors)

S. H. SMITH SWIVEL FOR SUPPORTING DRILL STRING IN SUBMERGED CASING HEAD Filed June 12, 1964 2 Sheets-Sheet l f'llE.-E

INVENTOR 514M054 H, 54/ TH S. H. SMITH Jan. 31, 1967 SWIVEL FOR SUPPORTING DRILL STRING IN SUBMERGED CASING HEAD Filed June 12, 1964 2 Sheets-Sheet 2 R m N E V m w.

8 a i w v, I I w u 1 um I 1 T q 1 I. aw W 5 0 z a r v I n a 0 M 7 M M w w? M? M a m w m 333%? 6 M 7.\\M\% TLLET-Z United States Patent 3,301,324 SWIVEL FOR SUPPORTENG DRILL STRING IN SUBMERGED CASING HEAD Samuel H. Smith, Oklahoma City, Okla, assignor to A-1 Bit 81 Tool Company, Oklahoma City, Okla., a corporation of Texas Filed June 12, 1964, Ser. No. 374,719 13 Claims. (Cl. 166-.5

This invention relates generally to improved swivels useful in connection with well tools. More particularly, but not by way of limitation, this invention relates to an improved swivel useful in connection with operations performed in wells located beneath the surface of a body of water by apparatus extending from a floating drilling platform.

During relatively recent years, considerable drilling activity directed to locating new oil and gas production and reserves has been conducted in drilling wells located in the bottom of lakes or in the floor of the ocean lying offshore. Drilling activity occurring beneath the surface of bodies of water has introduced a variety of new problems in the technology of the oil industry. Initially, oflshore wells and lake bottom wells were drilled froma platform that was supported by the lake bottom or ocean floor. Most of the new problems encountered in drilling from the fixed platforms resulted primarily from the separation between the drilling rig and the well head which was located on the lake bottom or ocean floor. Often, several hundred feet of water separated the rig from the well head.

More recently, it has been found more practical, particularly in extremely deep water, to drill such wells from floating barges or platforms. It has been found that the drilling barges can be successfully restrained in a position on the surface of the water over the well so that drilling operations can continue in all but the most severe weather. A great amount of difliculty has been encountered in attempting to compensate for the changes in depth of water due to strong wave action and tidal effects.

One method utilized to compensate for the depth changes is the provision of a slip or telescoping connec tion in the drilling string extending from the floating barges into the well. As the water depth decreases, the connection can telescope to reduce the overall length of the drilling string. As the water depth increases and the barge rises relative to the well head, the connection increases in length to provide a longer drilling string. It should be pointed out that the weight of the drilling string will retain that portion of the drilling string below the telescoping connection in position while the barge rises.

The use of telescoping connections has met with a degree of success when the drill bit is resting on the bottom of the well during actual drilling. When certain operations are to be performed in the well bore above the bottom of the well, the lower portion of the drilling string will move vertically in the well bore due to the depth changes of the water, unless restrained.

For various reasons, a metallic liner, known commonly as a well casing, is set in the well bore during the drilling of the well. Regulations have been promulgated requiring the removal of well casings to a specified depth below the ocean floor when a well has been determined to be a non-producer. Under normal circumstances, the well casing is generally removed by connecting a casing cutter or mill to the lower end of the drilling string and extending the drilling string and attached cutter into the well casing to the specified depth. Upon reaching the specified depth, the cutter members of the casing cutter are moved into engagement with the well casing and the drilling string and casing cutter rotated until the casing has been parted. A pulling tool is then latched onto the upper, separated portion of the well casing and an upward force exerted thereon, lifting the casing from the well bore. Diflicult'y has been encountered in attempting to cut the casing at the specified location when using floating platforms due to the water changing in depth and moving the'floating platform vertically. Well casings are relatively hard and diflicult to out even with the cutter or mill engaging the casing along a single circumferential line of contact. It can-be easily imagined how much more difficult such a cutting operation becomes when the cutter is constantly moving in the vertical plane during the attempt to part the well casing.

In very broad terms, this invention appertains to an improved swivel interposed in a drilling string extending from a floating platform wherein the swivel is cooperable with the well casing to prevent the drilling string from moving downwardly relative to the casing when performing operations such as cutting the well casing. The telescopic connection previously mentioned is placed in the drilling string to compensate for the vertical movement of the floating platform and the weight of the string is utilized to keep the swivel in position in the casing during upward movement of the floating platform.

This invention also contemplates an improved swivel including an inner tubular member adapted at each end for connection with the drilling string, a tubular housing encircling the inner tubular member which is rotatable relative to the housing, and an annular support member carried by the housing and engageable with the well casing to prevent downward movement of the swivel and drilling string relative to the well casing.

One object of this invention is to provide an improved apparatus useful in connection with operations performed in offshore wells from a floating drilling platform to prevent vertical movement of the drilling string in a well bore.

Another object of the invention is to provide an improved swivel adapted to be connected in a drilling string and arranged for cooperation with the well casing to prevent downward movement of the drilling string in the casing while permitting rotation of the drilling string relative to the casing.

A further object of the invention is to provide an improved swivel carrying an annular support member which is engaged with the swivel housing and with the well casing wherein the area of contact between the swivel housing and support member is less than the area of con tact between the support member and casing, so that the swivel housing and drilling string will rotate relative to the support member in the event that the swivel bearings lock.

One other object of the invention is to provide an improved swivel of relatively simple construction yet arranged to permit relative rotation between the swivel and casing while preventing downward movement of the swivel in the casing.

A still further object of the invention is to provide an improved swivel for use underwater that incorporates means for preventing water from contacting the bearing means located therein.

One other object of the invention is to provide an improved swivel that can be easily and economically manufactured.

The foregoing and additional objects and advantages of the invention will become more apparent as the following description is read in conjunction with the accompanying drawings wherein like reference characters denote like parts in all views, and wherein:

FIG. 1 is a view, partly in elevation and partly in crosssection, of a portion of a floating drilling platform and a drilling string incorporating a telescopic connection extending from the platform to a swivel and cutter positioned in a well located in the ocean floor;

FIG. 2 is an enlarged cross-sectional view of the well casing with one embodiment of a swivel constructed in accordance with the invention located therein; and,

FIG. 3 is a view, partly in cross-section and partly in elevation, showing a cutter or, mill in the well casing.

Referring to the drawings in detail, and to FIG. 1 in particular, shown therein is a portion of a drilling barge or platform floating on the surface of a body of water 12. Mounted on the upper surface of the drilling barge or floating platform 10 is a drilling rig 14. Extending downwardly from the drilling rig 14 through the floating platform 11 is a drilling string 16 which includes a telescoping or slip connection 18 for purposes which will be described more fully hereinafter. The drilling string 16 extends downwardly into an inner casing 20 which is disposed in axially aligned intermediate casing 22 and exterior casing 24. The exterior casing 24 is positioned in a bore hole 26 extending into the bottom 28 of the body of water 12. The drilling string 16 is shown connected with a swivel assembly 30 which will be described in more detail hereinafter. One or more sections of. the drilling string 16 extend downwardly from the swivel assembly 30 and are connected at their lower end with a casing mill or cutter assembly 33.

FIG. 2 illustrates, in a greatly enlarged sectional view, the details of construction of the swivel assembly 30. As shown therein, the swivel assembly 30 is positioned in the inner casing 20. The swivel assembly 30 includes an inner tubular member 32 which extends axially through a tubular housing 34. The inner tubular member 32 includes an upper end 36 and a lower end 38, each of which is suitably arranged for connection with the drilling string 16. A radially extending exterior flange 46 encircles the medial portion of the inner tubular member 32, providing an upwardly facing shoulder 42 and a downwardly facing shoulder 44 thereon. The tubular housing 34, which encircles the inner tubular member 32, comprises an upper portion 46 and a lower portion 48 which are secured together by means of a plurality of screws 50 extending through a circumferential flange 52 on the lower end of the upper portion 46 and into the upper end of the lower portion 48 of the tubular housing 34; The upper end of the lower portion 48 is enlarged in diameter to provide a downwardly facing shoulder 54 and an enlarged bore 56 surrounding the exterior flange of the inner tubular member 32. I j 3 An upper thrust bearing assembly SS'is disposed between the lower end of the upper portion 4-6 of the tubular housing 34 and the upwardly facing shoulder 42 provided by the flange .41) on the inner tubular member 32. Similarly, a lower thrust bearing assembly 60 is located between an upwardly facing shoulder 62 formed by the bore 56 in the lower portion 48 of the tubular housing 34 and the downwardly facing shoulder 44 provided by the flange 40 located on the inner tubular memberj 32. The arrangement of the thrust bearing assemblies 58 and 60, in cooperation with the flange 40 and the tubular housing 34, is such that the inner tubular member 32is prevented from moving vertically with respect to the tubular housing 34.

Upper and lower annular sleeve bearings 64 and 66, respectively, are disposed between the inner tubular member 32 and the tubular housing 34, to permit relative rota tion therebetween. The upper sleeve bearing-64 is disposed within the upper portion 46 of the tubular housing 34 and the lower sleeve bearing 66 is disposed within the lower portion 48 0f the tubular housing 34.

A pair'of threaded openings 68 and 70 extend through the enlarged portion of the tubular housing 34 to provide communication with the bore 56. Theopenings 68 and 70 are utilized to introduce a lubricant into the enlarged bore 56 for'the purpose of reducing the friction in the various bearing members. After the lubricant is introduced into the bore 56, the openings 68 and 70 are closed by threaded plugs 72 and 74, respectively.

An upper packing assembly 76 encircles the inner tubular member 32 and is disposed with the upper portion 46 of the tubular housing 34, adjacent the upper end of the. upper sleeve bearing 64. A lower packing assembly 78, which is identical to the packing assembly 76, encircles the inner tubular member 32 within'the lower portion 48 of the tubular housing 34, adjacent the lower end of the lower sleeve bearing 66. The packing assemblies 76 and 78 are retained within the tubular housing 34 by upper and lower end caps 80 and 82, respectively, which closely encircle the inner tubular member 32 and are attached to the ends of the tubular housing 34 by means of a plurality of screws 84.

Each of the packing assemblies 76 and 78 includes a pair of identical, though inverted, packing members 86, each of which is comprised of a plurality of chevron-type packing elements 8. The packing members 86 in each of the packing assemblies 76 and 78 are spaced apart by means of a coil spring 90 which encircles the inner tubular member 32 and exerts a force tending to compress the packing members 86. A passageway 92, which extends through the upper portion 46 ofthe tubular housing 34 into the space containing the upper packing assembly 76, is provided for the purpose of injecting a quantity of lubricating material, such as a heavy grease, therein. The lubricant injected into the space between the packing members 86 serves to enhance the sealing qualities of the packing assembly 76, as well as providing additional lubricant for the rotating parts of the swivel assembly 30. A plug 94 is illustrated as being inserted in the passageway 92 after the lubricant has been injected therein. A passageway 96 extends through the lower portion 48 of the tubular housing 34 into the space between the packing members 86 of the lower packing assembly 78 for the identical purpose that the passageway 92 serves in connection with the upper packing assembly 76. A plug 98 is utilized to close the passageway 96 after lubricant has been injected therein.

The upper portion 46 of the tubular housing 34 is provided with a circumferential flange 100 which provides an upwardly facing shoulder 102. An annular guide member 104, having a plurality of vertically extending ports 106 therein, encircles the upper portion 46 of the tubular housing 34 above the upwardly facing shoulder 192. The annular guide member 104 is retained on the tubular housing 34 by means of a retaining ringv 107 which is attached to the upper portion 46 by means of set screws 108. The annular guide member 104 has an outer diameter sized to fit within the interior of the inner casing for purposes which will become more apparent hereinafter.

A- support member 110 encircles the lower portion 48 of the tubular housing 34 and has an upper surface thereon engageable with the downwardly facing shoulder 54 of the tubular housing 34. The support member 110 has a beveled lower surface 112 that engages an upwardly facing shoulder 114 formed in the inner casing 20. A plurality of vertical passageways 116 extend through the support member 110. The support member 110 is re tained on the tubular housing 34 by a ring 118 which encircles the lower portion 48 of the tubular housing 34 below the support member 110. The ring 118 is fixed to the tubular housing 34 by means of set screws 120 which extend through the ring 118 into the tubular housing 34. It should be pointed out that the area of contact between the downwardly facing shoulder 54 on the tubular housing 34 and the upper surface of the support member 110 is less than the area of contact between the beveled surface 112 of the support member 110 and the upwardly facing shoulder 114 in the inner casing 20, for purposes which will be explained in connection with the operation of the swivel assembly 30.

As illustrated in FIG. 1, a cutter assembly 33 is connected with the swivel assembly 30 by one or more sections of the drilling string 16. FIG. 3 illustrates the cutter assembly 33 in more detail. As shown therein, the cutter assembly 33 includes a body portion 122 which carries a plurality of extensible cutter members 124 in recesses 126 located therein. The cutter members 124 are extended into engagement with the inner casing 20 by hydraulic or mechanical forces acting on the cutter members 124 so that the casing 20 will be cut at the desired point upon rotation of the cutter assembly 33. The construction and operation of suitable cutter assemblies is well known to the skilled in'the oil industry. Several suitable types are commercially available.

In using the apparatus constructed in accordance with the invention, the casing cutter assembly 33 is attached to the lower end of the drilling string 16 and the casing cutter and drilling string are then lowered from the drilling rig 14 and floating platform It] until the proper number of sections of the drilling string 16 are assembled to provide the proper spacing between the cutter assembly 33 and the swivel assembly 30. The swivel assembly 30 is then connected in the drilling string 16 and lowered therewith into the inner casing 20. The telescoping connection 18 is inserted in the drilling string 16 in any suitable position between the swivel assembly 30 and the floating platform 10, so that the telescoping connection 18 can compensate for changes in depth of the water 12, as previously described.

When the beveled lower surface 112 of the support member 110 on the swivel assembly 30 engages the upwardly facing shoulder 114 in the inner casing 20, the cutter assembly 33 is in the desired position to cut the inner casing 20. At this time the guide member 104 has also entered the inner casing 20 and fits sufliciently closely therein to maintain the axial alignment of the drilling string 16 with the inner casing 20. Upon reaching this position, the cutter assembly 33 is actuated to extend the cutter members 124 into engagement with the wall of the inner casing 20. The drilling string 16 is then rotated, causing the inner tubular member 32 of the swivel assembly 30 to rotate, which in turn rotates the sections of drilling string 16 between the cutter assembly 33 and the swivel assembly 30 and, at the same time, rotating the cutter assembly 33. During this stage of the operation of the swivel assembly 30, the inner tubular member 32 is rotating relative to the tubular housing 34 with little or no frictional resistance, due to the provision of the lubricated thrust bearing assemblies 58 and 60 and the annular sleeve bearings 64 and 66.

Should any of the bearings become locked, causing the tubular housing 34 to rotate with the inner tubular member 32, the tubular housing 34 will rotate relative to the support member 110. As previously mentioned, the relative rotation between the tubular housing 34 'and the support member 110 occurs due to the area of contact between the tubular housing 34 and the support member 110 being less than the surface area of contact between the support member 110 and the upwardly facing shoulder 114 of the inner casing 20. Thus, it can be seen that even though a malfunction should occur in the bearings of the swivel assembly 30, provision is made for the continued rotation of the drilling string 16 relative to the inner casing 20, thereby permitting the completion of the cutting operation without the necessity of withdrawing the entire apparatus for replacement of the locked swivel assembly 30.

It can be seen that during the cutting operation the weight of the drilling string 16 will retain the beveled lower surface 112 of the support member 110 in engagement with the upwardly facing shoulder 114 due to the action of the telescoping connection 18, even though the floating platform may be moving upwardly with respect to the inner casing 20. Downward movement of the floating platform 10 will not affect the position of the 6 cutter assembly 33 in the inner casing 20 due to the thrust bearing arrangement between the inner tubular member 32 and the tubular housing 34, which transfers any downward force exerted thereon to the support member which is in engagement with the inner casing 20. It can be seen, then, that regardless of the vertical movement of the floating platform 10, the cutter assembly 33 will be retained in a fixed vertical position relative to the inner casing 20.

It can be appreciated from the foregoing description that even though the swivel assembly 30 is to be used under water, the bearing assemblies located therein are effectively sealed from the effects of the water by the upper and lower packing assemblies 76 and 78, respectively. Furthermore, it can be appreciated that the swivel assembly 30, constructed in accordance with the invention, can be relatively easily and economically manufactured.

It should also be understood that the single embodiment of the invention shown and described herein is by way of example only and that many changes and modifications can be made thereto without departing from the spirit of the invention or from the scope of the annexed claims.

What I claim is:

1. A swivel adapted for connection in a drilling string for supporting a well tool in a well casing, comprising:

an inner tubular member having upper and lower open end portions arranged for connection with the drilling string, said inner tubular member having a circumferential flange extending radially from the medial portion thereof;

a tubular housing encircling the medial portion of said inner tubular member, said housing having an enlarged central portion forming a downwarly facing exterior shoulder;

thrust bearing means disposed between said circumferential flange and said housing for preventing relative up or down movement between said inner tubular member and housing;

annular bearing means disposed above and below said thrust bearing means for permitting relative rotational movement between said inner tubular member and housing; and,

an annular support member encircling and supported on said housing below said exterior shoulder in sliding engagement with said exterior shoulder and engageable with a well casing to prevent downward movement of said swivel relative to the casing.

2. The swivel of claim 1 wherein said tubular housing also has:

an enlarged bore forming an annular chamber in the central portion thereof adjacent said thrust bearing; and,

upper and lower openings extending through said housing into said chamber, whereby a lubricant is introduced into and substantially fills said annular chamber.

3. The swivel of claim 1 and also including:

upper and lower end caps attached to said tubular housing and closely encircling said inner tubular member;

packing means disposed within said housing between said end caps and annular bearing means; and,

annular guide means encircling said housing spaced from said support member and sized to fit within the well casing to maintain a substantial axial alignment between said swivel and easing.

4. The swivel of claim 1 wherein said annular support member is rotatable on said housing; and, wherein the area of contact between said support member and downwardly facing shoulder is less than the area of contact between the support member and casing, whereby said inner tubular member and housing can rotate relative to said support member should said inner tubular member and housingbecome locked together.

5. Apparatus useful in the drilling of wells located below the surface of a body of water wherein a floating drilling platform is utilized, the improvement comprising:

a drilling string extending from the drilling platform into the well;

a telescoping joint interposed in the drilling string whereby the relative length of the drilling string can change in response to changes in the water level;

a well casing disposed in the well and having an upwardly facing shoulder formed in the interior thereofgand,

a swivel interposed in the drilling string and disposed within said casing, said swivel including:

an inner tubular member havingupper and lower end portions connected with said drilling string,

a tubular housing encircling the medial portion of said inner tubular member and rotatable relative thereto, and

an annular support member carried by said housing and engageable with the upwardly facing shoulder in said casing to prevent relative downward movement of said swivel and drilling string in said casing.

6. Apparatus useful in connection with wells located below the surface of a body of water wherein a floating drilling platform is utilized, the improvement comprising:

a drilling string extending from the drilling platform into the well; t

a telescoping joint interposed in the drilling string whereby the relative length of the drilling string can change in response to changes in the water level;

a well casing disposed in the well and having an upwardly facing shoulder formed in the interior thereof; and,

a swivel interposed in the drilling string and disposed within said casing, saidswivel including:

an inner tubular member having upper and lower end portions arranged for connection with the drilling string, said inner tubular member having a circumferential flange extending radially from the medial portion thereof;

a tubular housing encircling the medial portion of said inner tubular member;

thrust bearing means disposed between said ciroumferential flange and said housing for preventing relative up or down movement between said inner tubular member and housing,

annular bearing means disposed above and below said thrust bearing means for permitting relative rotational movement between said inner tubular member and housing, and

an annular support member encircling said housing in engagement with said housing and engageable with the upwardly facing shoulder of said well casing to prevent downward movement of said swivel and drilling string relative to the casing.

7. Apparatus useful in connection with wells located below the surface of a body of water wherein a floating drilling platform is utilized, the improvement comprising:

a drilling string extending from the drilling platform into the well;

a telescoping joint interposed in the drilling string whereby the relative length of the drilling string can change in response to changes in the water level;

a well casing disposed in the well and having an upwardly facing shoulder formed in the interior thereof; and,

a swivel interposed in the drilling string and disposed within said casing, said swivel including:

an inner tubular member having upper and lower end portions arranged for connection with the drilling string, said inner tubular member having a circumferential flange extending radially from the medial portion thereof,

a tubular housing encircling the medial portion of said inner tubular member, said housing having an enlarged central portion providing a downwardly facing exterior shoulder and having an enlarged bore therein fonrningan annular cham ber adjacent said circumferential flange and providing upwardly and downwardly facing interior shoulders,

upper and lower thrust bearings encircling saidAi-nn-er tubular member and disposed between said circumferential flange and downwardly and upwar-dly facing shoulders, respectively,

upper and lower annular bearing members. disposed between said inner tubular member and housing above and below said upper and lower thrust bearings, respectively,

an annular support; member encircling said housing in engagement with said downwardly facing exterior shoulder, and engageable with the upwardly facing shoulder of. the well casing to prevent downward movement of said swivel and drilling string relative to the casing, and

annular guide means encircling said housing spaced from said support member and sized to fit within the well casing to maintain a substantial axial alignment between .said swivel and easing.

8. The apparatus of claim 7 whereints-aid annular support member is rotatable on said housing; and, wherein the area of contact between said support member and downwardly facing shoulder is less than the area of contact betwee-n th'e support member and the upwardly fa-cing shoulder of said casing, whereby said inner tubular member and housing can rotate relative to said support member should said inner tubular member and housing become locked together- 9. A swivel adapted for connection in a drilling string for supporting a well tool in a well casing, Comprising:

an inner tubular member having upper and lower end portions arranged for connection with the drilling string, said inner tubular member having a circumferential flange extending radially fromfthe medial portion thereof;

a tubular, housing, encircling the medial portion of. said inner tubular member, said housing having an enlarged central portion forming a downwardly facing exterior shoulder; v

thrust bearing means disposed between said circumferential flange and said housing for preventing relative up or downnmovement between said inner tubular member and housing;

annular bearing means disposed above and below said thrust bearing means for permitting relative rotational movement between said inner tubular member and housing;

upper and lower end caps attached to said tubular housing and closely encircling said inner tubular member:

packing means disposed within said housing between said end caps and annular bearing means; and

an annular support member encircling said housing below said exterior shoulder-in engagement with said exterior shoulder and engageable with a well casing to prevent downward movement of said swivel relative to the casing.

10. In apparatus useful in the drilling of wells located below the surface of a body of water wherein a floating drilling platform is utilized, the improvement comprising:

a drilling, string extending from the drilling platform into the well;

an extensibietslip, joint interposed in the drilling string whereby the relative length of, the drilling string can change in response to changesin the water. level;

a well casing disposed in the well and having an upwardly facing shoulder formed thereon; and

a swivel interposed in the drilling string and disposed at least partially within said casing, said swivel including:

an inner tubular member having upper and lower end portions connected with said drilling string,

a tubular housing encircling the medial portion of said inner tubular member and rotatable relative thereto, and

an annular support member on said housing and positioned for engagement with the upwardly facing shoulder of said casing to prevent relative downward movement of said swivel and drilling string in said casing.

11. A swivel adapted for connection in a drilling string for supporting a well tool in a well casing comprising:

an inner tubular member having upper and lower end portions arranged for connection with the drilling string, said inner tubular member having a circum- 'ferential flange extending radially from the medial portion thereof;

a tubular housing encircling the medial portion of said inner tubular member, said housing having an enlarged central portion forming a downwardly facing exterior shoulder;

thrust bearing means disposed betwen said circumferential flange and said housing for preventing relative up or down movement between said inner tubular member and housing;

annular bearing means disposed above and below said thrust bearing means for permititng relative rotational movement between said inner tubular member and housing;

an annular support member encircling said housing below said exterior shoulder and engageable with a well casing to prevent downward movement of said swivel relative to the casing;

upper and lower end caps attached to said tubular housing and closely encircling said inner tubular member;

packing means disposed within said housing between said end caps and annular bearing means; and

annular guide means encircling said housing spaced from said support member and sized to fit within the well casing to maintain a substantial axial alignment between said swivel and casing.

12. A swivel adapted for connection in a drilling string for supportintg a well tool in a well casing comprising:

an inner tubular member having upper and lower end portions arranged for connection with the drilling string, said inner tubular member having a circumferential flange extending radially from the medial portion thereof;

a tubular housing encircling the medial portion of said inner tubular member, said housing having an enlarged central portion forming a downwardly facing exterior shoulder;

thrust bearing means disposed between said circumferential flange and said housing for preventing relative up or down movement between said inner tubular member and housing;

annular bearing means disposed above and below said thrust bearing means for permitting relative rotational movement between said inner tubular member and housing; and

an annular support member rotatably supported on and encircling said housing below said exterior shoulder and having a first surface in contact with a part of said shoulder and a surface of larger area than said first surface positioned thereon for engagement with a well casing to prevent downward movement of the swivel relative to the casing, the relative areas of said surfaces being such that said inner tubular member and housing can both rotate relative to said support member when said second mentioned surface is in engagement with a Well casing and said inner tubular member and housing become locked together.

13. A swivel adapted for connection in a drilling string for supporting a well tool in a casing comprising:

an inner tubular member having upper and lower ends arranged for connection with the drilling string, said inner tubular member having a circumferential flange extending radially from the medial portion thereof;

a tubular housing encircling the medial portion of said inner tubular member, said housing having an enlarged central portion providing a downwardly facing exterior shoulder and having an enlarged bore therein forming an annular chamber adjacent said circumferential flange and providing upwardly and downwardly facing interior shoulders;

upper and lower thrust bearings encircling said inner tubular member and disposed between said circumferential flange and downwardly and upwardly facing shoulders, respectively;

an annular support member encircling said housing in engagement with said downwardly facing exterior shoulder and engageable with the well casing to prevent downward movement of said swivel relative to the casing, said annular support member being rotatably mounted on said casing, and the dimensions of said annular support member and housing being such that the area of contact between said support member and the downwardly facing shoulder of the housing is less than the area of contact between the support member and casing, whereby said inner tubular member and housing can rotate relative to said support member should said inner tubular member and housing become locked together; and,

annular guide means encircling said housing spaced from said support member and sized to fit within the well casing to maintain a substantial axial alignment between said swivel and casing.

References Cited by the Examiner ERNEST R. PURSER, Primary Examiner,

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Classifications
U.S. Classification166/355, 175/7, 175/209, 166/55.7, 285/272, 285/123.3
International ClassificationE21B33/04, E21B33/03, E21B29/12, E21B29/00, E21B7/12
Cooperative ClassificationE21B33/0415, E21B7/12, E21B29/12
European ClassificationE21B29/12, E21B33/04F, E21B7/12