US1996264A

US1996264A - Adjustable anchor for wells

Info

Publication number: US1996264A
Application number: US677419A
Authority: US
Inventors: Hallie E Turner
Original assignee: T F ROTHWELL
Current assignee: T F ROTHWELL
Priority date: 1933-06-24
Filing date: 1933-06-24
Publication date: 1935-04-02
Anticipated expiration: 1952-04-02

Description

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H.l E. TURNER ADJUSTABLE ANCHOR FOR WELLS Filed'June 24, 1935 April 2, 1935.

Patented Apr. 2, 1935 ADJUSTABLE ANCHOR FOR WELLS VHallie E. Turner, Longview, Tex., assig'nor t T. F. Rothwell,

Beaumont, Tex.

y Application June 24, 193s, serial No. 677,419

8 Claims.

l My invention relates to supports or anchors for use in wells.V

In theV operation of tools such as pipe cutters, v

whipstocks, packers and the like, in wells it fre- I 5 quently isvnecessary to support devices of that character upon someA means anchored -in ythe casing of the well and acting in a general way to support the device which is being used. An eX- pedient some times adopted is to extend a pipe in advance of the tool to rest upon the bottom of the hole and support the tool at the desiredv height relative to the bottom of the well but this is unsatisfactory in that some times the tool must be supported at some distance from the bottom and the use of long .pieces of pipe are expensive and make it diicult to properly handle the tool. This is particularly the case where there is junk or other material in the well, making it uncertain where the bottom of the hole is located. It is an object of the invention to provide an anchor which may be easily engaged with the casing in the well and be a support for other tools at any desired point throughout Vthe length of the f casing. A-

I desire to form a supporting anchor which may be lowered into the well without danger of its be- Y ing operated or tripped to engage the casing at f y 'I projects.

I the wrong point in its course.

It is also an object to provide a device adapted to engage the casing and be anchored in position therein which may be tripped or set to engage the Icasing through the forceof flushing fluid which is pumped downwardly from the surface.

I also desire to form an anchor which 'may be adjusted to diierentlevels in the wall after it has been once tripped or set.

I also desire to form a,y setting tool whereby parts, will be more clearly understood from the fr following description.

Referring to the drawing herewith, Fig 1 is a central longitudinal section through my anchor showing the setting tool thereon and theanchoring dog as engaged with the casing.

Fig. 2 is a 'side elevational View ofthe assembled device. Y I

Fig. 3 is a front'elevation Vof a'slidableplate upon which the anchoring dog is pivoted.

Fig.lv4 isa side viewof the anchor dog,

- Fig. 5 Fig.V 3.

The body of my device, shown atk Iin theV drawing, is a cylindrical mandrel having its upper end threaded at 2 for engagement withaY nipple i. 5 3. Its lower end is reduced in diameter a short distance from the lower` extremity. to

form; a

shoulder 4, whichi acts to limit the upward -movement of a guard member 5. The interior of the mandrel I is end of which merges with the threaded portion 2 and the lower end of which isadapted to discharge liquid from the lower end ofl said man--` drel. The lower end of the opening is threaded jects below the mandrel fora short distanceand Y serves as a.Y guide forthe guard or latch member Y guard member.

5N isa cup-shaped device drel-and ,V

The guard member.

which encloses the lower end of the man projects below the same, having a central opening I0 therein through which the guide The lower end of the guide member member has nuts II thereon, and a Vhelicall compression spring I2 is seatedion said nuts, bearing at its v `upper end against the lower extremity of the guard 5. `The guard is thus held resiliently upwardly with its upper end bearing against thev shoulder 4. It is adapted lto rbe depressed into its lower position, shown in Fig. l, by the pressure of flushing uid` exerted downwardly

theV passages

8 and 9.

The supporting `dog which through anchors the device in the well comprises a plate I3, which, as shown in Fig. 1, is of sufficient width to-fo-rm a contact 5,40'

with the casing. Its outer surface :is curved to' conform to the curvature rof the casing andits lower end is formed with an outwardly `As will be seenvfrom Figsl and 4, the dog is of greater thickness at its lower tapers slightly toward the upper end, said upper y projecting nose I4 thereon to engage within thejoint formed .between the vends of section of .casing...,.

latching end and end havinga projection I5 thereon extending I5 is formed a comparatively narrow keylike is an end'view ofthe plate shown in n 15` to receive 9v tubular guide member 1, which pro-rl` y projectionl'l, which is adapted to intert with Y, the supporting plate I8. y

Theplate I8 is a rectangular plate shown ina the mandrel.

Figs. 3 and 5. It has its side faces I9 beveled so that it may t within a slot 20 in the side of the mandrel and be slidable therein. The beveling of the edges of the supporting plate gives the same a dovetailed fit within the slot, preventing its removal but allowing a longitudinal sliding movement of the plate in said slot. The plate is formed with an opening Ztl-a at its upper end through which a 'pivot pin 2l may extend, said pivot-pin acting as a connecting means between the dog I3 and said supporting plate. The plate has a longitudinal recess 22 therein to receive the projecting key I1 upon the dog I3. At the lower end of the plate I8 is a cylindrical recess 23 adapted to receive a coil spring 24. Said spring Vbears at its outer end within a recess indicated The plate I8, together with the dog l3thereon,

is slidable within the slotl20, formed on a down- `wardly inclined face on the mandrel. As will be understood from Fig. l, the lower wall of the slot 20 forms an inclined plane. When the plate I8, with the dog thereon, is at the lower end of the slot 20 it will bear against a shoulder 25 upon It may be held temporarily in that position by the usev of dowel pins 2,6 on the face of the mandrel andadapted to engage within small openings 2T in the dog I3 and when thus latched in position the guard 5 will engage over Athe lower end of the dog and hold the same latched over the ends of-said dowels 26, preventlower side of the mandrel and adapted to be held resiliently outwardly by means of a spring 28. VSaid spring may be depressed when the guard -5 is moved upwardly, but when the guard is moved into'the position shown in Fig. l the pin 4l' will be forced outwardly into position, preventing the return of the guard member' to latching position.

'I'his device may be introduced into the well by means of a setting tool including a tubular setting member 30. Said member is formed with an upper threaded shank 3l by means of which it may be attached'to a pipe or drill stem for operation. The lower end of the setting member its reduced in diameter at 32 to engage with a nut 33. The engagement between the two

parts

32 and 33 is by way of keys or splines 34 on the setting member, slidable within keyways 35 in the nut. Said nutis held in position on the setting member by a ange 36' at the lower endof said member and is limited in its upward move- `ment by the shoulder 31 formed by a flange 38 on the setting member adapted to contact with the upper end of the nipple 3 previously referred to. The inner faceof said nipple isA threaded to engage With the nut and said nut may be screwed therein in a lefthand direction. That is, the said nut Vis formed with a lefthand thread so that it Ais .screwed from position in the nipple by the right handrotation from above of the setting n -the lower end of-the slot 20 and is latched in position at that point by engaging the openings 21over the ends ofthe dowels 26. The latching pin 41 is depressed to allow the guard member to be moved upwardly by the spring over the lower end of the latching dog, as shown in Fig. l, thus holding the said latching dog at the lower end of the guideway in an inoperative position.

When the device is being introduced into the hole the contact of the lower end thereof with projections or obstructions in the hole will not tend in any manner to unlatch andV disengage the anchoring dogs. When the proper level in the well has been reached where the anchor is to be set, the pumps will be started, forcing fluid downwardly through the device and through the passages 9 in the mandrel to the inner side of the guard 5. Pressure of the liquid will force the said guard downwardly from latching position and will allow the spring 24 to force the dog outwardly away from the mandrel. This will release it from the dowels 2G and will allow the anchoring dog to be moved upwardly along the slotted guideway 20. The device is then raised or lowered until a coupling in the casing has been reached. The dog will then be forced by the spring into the space between the ends of the sections of the casing so that the dog I3 may"l rest upon the shoulder'formed by the ends of the casing sections. The device may then be rested upon said shoulder at the coupling, as shown in Fig. 2, supporting the Weight of the tool. This is a iirm and substantial support and will sustain a considerable weight.

The support being thus formed upon the casing at one of the joints not only furnishes a substantial base for the anchor which will not tend to expand the casing, but it has the further advantage that the tool supported upon the anchor is spaced upwardly away from the coupling. Thus, a packer could be set better away from the joint, or a whipstock would deect the cutter through the pipe without engaging the' coupling.

It will be seen that when the device is thus supported it will be impossible thereafter to lower the device in the casing. It may be raised to higher levels, engaging the latching dog and other couplings in the casing but it may not be lowered. When the device is thus supported in position the drill stem may be rotated to unscrew the nut 33 from its connection with the nipple 3, and this may be done with a right-hand rotation of the' pipe and nipple. When the nut has been unscrewed, the nipple, together with the drill stem and nut, may be withdrawn, leaving the anchor in position. This anchor may thus be set at any desired point in the casing and will serve as a support for different tools when such a support is desired. When it is necessary to withdraw the anchor from the well this may be done by introducing the setting device 3B and screwing the nut 33 back into its connection with the nipple and pulling upwardly on the anchor. As the device is raised the anchoring dog I3 will be moved downwardly in the inclined slot 20 into a position away from the casing and allow no obstruction to the upward movement of the anchoring device.

The device thus constructed will have certain obvious advantages previously mentioned.

What I claim is:

l. An anchor for wells including a mandrel, supporting means thereon adapted to be forced into supporting ,contact with a well casing, means engaging about said supporting means to retain the same out of engagement with said casing,

and means whereby liquid under pressure may plate slidable thereon, a dog pivoted on said plate,

be employed to move said retaining means and release said supporting means.

n 2. An anchor for wells including a tubular mandrel, a supporting dog slidable thereon into casing-engagingposition, and a cap to retain said dog normally in inoperative position, said cap being movable in response to fluid pressure to release said dog.

3. An anchor for wells including a tubular mandrel, a supporting dog slidable thereon into casing-engaging position, and a cap to retain said dog normally in inoperative position, said cap being movable in response to iiuid pressure to release said dog, and means to prevent the movement of said cap back to latching position.

4. An anchor for wells including a tubular mandrel, a supporting dog slidable thereon into casing engaging position, a cap, a spring acting to urge said cap into latching position to retain said dog normally in inoperative position, said cap being movable in response to fluid pressure to release said dog.

5. An anchor for Wells adapted toI be secured to a well casing, including a'tubular mandrel, a plate slidable thereon, a dog pivoted on said plate, means to swing said dog outwardly to engage a joint in the casing, said plate and dog being movable to and from casing-engaging position, and means releasable through liquid pressure to hold said dog and plate from casing en- Vgaging position.

6. An anchor for wells adapted to be secured to a Well casing, including a tubular mandrel, a

means to swing saidv dog outwardly to engage a joint in the casing, said plate and dog being movable to and from casing-engaging position, and a cap engaging oversaid mandrel to latch and retain said dog in inoperative position, said mandrel having uid channels whereby liquid under pressure may be forced into said cap to move it from latching position.

7. An anchor for wells including a mandrel, supporting means thereon to engage within a joint of the well casing, means normally latching said supporting means in inoperative position, means to lower said anchor into the well, said mandrel having a fluid passage therethrough,

fluid pressure operated means to release said latching means, and means to thenV move said supporting means tocasing engaging position, said mandrel being supported on said supporting means by relative downward movement of said mandrel.

8. An anchor for wells including a hollow mandrel, a tapered surface thereon, a member slidably mounted on said tapered surface, and pipe engaging means associated with and adapted to support said member whereby said mandrel may be lowered therealong and be wedged in supported position within the casing, said pipe engaging means being released by fluid pressure and adapted to be moved from an inoperative position into contact with the casing when it is desired to set the anchor. I-IALLIE E. TURNER.