US 2204378 A
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Description (OCR text may contain errors)
June. 11,' i1940. R. E'. o'poNNELl.
OPEN H'OLE PAOKER Filed June 8. 1939 2 She`etS-Sheet 1 ATTORNEYS.
- slips to casingin the well.
Patented June 11, 1940 PATENT OFFICE l 2,204,313 i 4 OPEN nous PAcKim Roland ODonnell, Midland, Tex., assigner to Halliburton Oil Well Cementing Company,
I Duncan, Okla.
Application June 8, 1939, Serial No. 278,051
'I'his invention relates to packers adapted for vuse in,oil wells, and more particularly to packers provide a packer in the open hole whichwill hold uid under pressure. Thus, where the Well is being cemented by what is known as a squeeze job in which the cement is forced under high pump pressure down through tubing and ofi into the formation of the well, it is necessary to prevent the cement from flowing upwardly on the outside of the tubing. As commonly practiced heretofore, the cement has been prevented from moving upwardly on the outside of the tubing b v means of a cement retainer set by means of It is sometimes desirable, however, to cement off a formation some distance below the shoe of the casing while preventing the flow of cement into another formation below the shoe of the casing but above the formation being cemented. The present arrangement, wherein the packer is set and secured in the open hole beneath the shoe of the casing and so arranged as to withstand Yconsiderable prese sure. is intended to solve this problem.
Packers of the type herein shown and described may also be used to advantage in connection with the acidizing ofoil wells. They are particularly adapted for use in connection with combination acidizing and cementing operations of the type shown, described and claimed in the United States ,e patent to William D. Owsley, et al., No. 2,163,449,
for Method of treating a well, granted June 20, 1939. y
Accordingly, it is one object of the invention to provide a packer whichwill be capable of withstanding high pressure when seated within the open portion of an oil well or the like.
It is another object of the invention to devise novel means forsupporting and securing a packer in the open portion of an oil well and to provide novel means for connecting tubing or other conduit means thereto.
It is still another object of the invention to provide novel means for securing and sealingl a valve in theopen portion of an oil well.
It is still another object of the invention to provide novel means for setting a packer in a well and for detachably connecting tubing thereto.
Other objects and advantages reside in certain novel features of the arrangement and construc- .tion of parts as will be apparent from the follow- (Cl. 16S-10) ing description taken in connection with the accompanying drawings, in which:
Figure 1 is a vertical, cross-sectional View of' a section of the open portion of an oil well showing apparatus constructed in accordance with 5 the present invention being loweredftherein;
Figure 2 is a vertical, cross-sectional view of the open portion of an oil well with they same apparatus asv that ,shown in Figure 1 located therein, thisgure showing the position of the 10 parts when the packer is set; 1
Figure 3is an enlarged, vertical, cross-sectional view of the packer setting apparatus shown in Figures 1 and 2, the view being taken at right angles to the section illustrated in Figures 1 and 2; 1.5
Figure 4 is an enlarged, vertical, cross-sectional view of the packer assembly of the apparatus of Figures 1 and 2, the view being taken at right angles to the sections shown in Figures 1 and 2;
Figure 5 is a transverse-sectional view yof the 20 apparatus shown in Figure 3, taken on the lines 5--5 thereof; and l Figure 6 is a diagram showing va development of the slot used in connecting the packer setting tool to the packer assembly and showing in dotted lines the positions of the connecting pins during various operations of the arrangement.
Referring to the drawings 'inv detail, and rst to the assembly ofthe apparatus shown in Figures `1 and 2, it will be seen that the open por- 30 tion of an oil well is there illustrated at Il. Within the well, apparatus lconstructed in accordance with the present inventiomis lowered upon tubing or other` pipe, as illustrated at I2.- The apparatus of the present invention consists of two assemblies, one being the packer assembly and the other the assembly used in setting the packer, the packer setting assembly being con-A nected to the tubing I2 and carrying the packer assembly at its lower end through pin and slot connections as will presently be described. l 40 The packer setting assembly includes a section of pipe I3 screw threaded into the tubing I2 and which is called a neck. The lower end of this neck is connected by screw threads I4 to a collar I5, and the collar is in turn connected'by screw lthreads I6 to a depending inner sleeve I1. The
sleeve I 'I extends down over a head I8 on a mandrel I9 which forms part of the packer assembly, .and the sleeve I1 is connected to the head 50 IB 'by pin and slot connections, the slot being in the sleeve I1 as shown at 20 and the pins being secured to the head I8 as shown at 2|.
Within the sleeve I1, there is a packing mandrel 22 mounted for limited longitudinal move- 55 ment. 'I'he upper end of this mandrel is provided with a head 23 which prevents the packing `mandrel moving downwardly below the point where the head 23 contacts apacking ring 24. Upward movement of the packing mandrel is limited by a stop ring 25 screw threaded into the upper end of the neck I3. The packing mandrel 22 extends through suitable packing, such'as the chevron packing illustrated at 26 clamped within the collar I5 by the packing ring 24. The lower end of the packing mandrel 22 is connected to an adapter 21 to which a tail pipe 23 is connected, this tail pipe extending down through the head I8 and into the mandrel I9 of the packer assembly. Additional packing is provided between the tail pipe 23 and the head I3, this packing being illustrated at 29 and being shown as secured in place by means of a clamping ring 30.
The packer setting assembly also includes an outer sleeve 3| which is fitted over the sleeve I1 and which may be referred to as a locking sleeve, since it functions to hold the pins 2| in the proper positions in the slots 2|I until it is desired to release the setting assembly from the packer assembly. The operation of the sleeve 3| to accomplish this will be described hereinafter in connection with a description of Figures 3, 5 and '6. 'I'he sleeve 3| is not as long as the inner sleeve I1, and the inner sleeve I'I is provided with an enlargement or shoulder I'Ia at its lower end to hold the outer sleeve 3| in place. It will be noted that there are no threads on the sleeve 3| and that it is free to rotateupon the sleeve I1.
In addition to the mandrel I9 with its head I3 previously described, the packer assembly includes a rubber sleeve or packer 32 mounted upon the mandrel I9 and provided with an upper shoe 33 and a lower shoe 34. The upper shoe 33 containsslips 35 having upwardly directed teeth on their inner surfaces adapted to grip and engage the mandrel I9 and prevent upward movement of the shoe 33 thereon when the shoe 33 is forced downwardly. The slips 35 are held in place by means of a slip retaining ring 36 screw threaded into the top of the shoe 33. A rubber compression ring 31 may be placed between the ring 36 and the slips 35, if desired.
'I'he lower shoe 34 of the packer assembly is provided with a suitable valve, such as the ball 33 actuated underthe iniluence of a coil spring 39 carried by a cage 40 mounted within an adapter 4| adapted to make connection with an anchor uresv 1 and .2.
`pipe 42, only a portion of ,which is shown in'Figl It will be-understoodthat the anchor pipe l42 will extend to the bottom of the well and'serve as means for supporting the lower shoe 34 of the packer against downward movement in the well. rIt will be understood that the anchor pipe may be provided with holes at vari- Ious points throughout its length so that uid may readily flow outwardly therethrough, and that it may be made of drillable material soy that it may be easily rremoved from the wellafter the assembly V.has been used in cementing, acidizing, or otherwise treating the well. f
' Devices 'constructed in accordance -with` the present invention' have been used in the 11eld,'thel anchor pipe being made of wood or aluminum and the mandrel I9 of Bakelite or castiron, and the shit-.fs 33 and 34 of aluminum. 'I'he back pressure valve may be made up of the lball 33 of hard rubber, the valve cage 40 of aluminum,
and the adapter 4| of aluminum.
Figure 2 shows the arrangement of Figure l with the parts in the posit'on which they occupy ting assembly has been removed from-the well.
In order to set the packer, it is simply lowered into the well with the parts occupying the positions shown in Figure 1. When the anchor pipe 42 strikes the bottom of the well, the tubing I2 is rotated to bring the pins 2|- into the proper portion in the slots 2|I to permit the sleeve |'I to move downwardly under the influence of the .weight of thetubing I2 and cause the shoulder Ila to force the upper shoe 33 downwardly so that the packer is expanded into the position shownv in Figure 2 to form a tight seal with the wallof the well, the slips 35 latching the upper shoe 33 in place so that the. packer assembly is firmly secured in the well. Cementing, acidizing,I or other uid treating operations may then be carried on since iluid may flow downwardly through the tubing |2, the neck I3, the packing mandrel 22, the tail pipe 23, the mandrel I9, and the back pressure valve 33 into the anchor pipe 42. After uid .has been forced downwardly in this manner, the back pressure valve 33 will close and prevent upward flow of fluid in the well after the tubing I2 and the packer setting assembly have been removed from the well.
As stated above, it is necessary to rotate the sleeve I'I with respect to the packer mandrelA I9 in order `to set the packer. In order to prevent accidental relative rotation between these parts while the apparatus is being lowered into the well. it is desirable to provide means which will offer some resistance to this relative movement. In the apparatus illustrated'. this is provided by means of the outerV sleeve 3| and its associated parts, this best being understood by referring to Figures 3, 5 and 6. As shown in Figures 3 and 6, the slots 23 are provided with longitudinal portions which extend from the very bottom of the sleeve II up to ya'point well above the lateral offset portions indicated at 20a. The pins 2| on the packer mandrel occupy the position illustrated in Figure 6 at 2Ia when the assembly is being lowered into the Well. They occupy the position shown at 2lb when the packer is being -set by the packer setting assembly, and then portion 20al of the slots until the sleeve 3| is rotated with respect' to the sleeve I'I. This is accomplishedby means of pins 43 shown in Figures 3, 5 and 6, which pins are integral with the outer sleeve 3| and extend'inwardly into the portion 20a of the slots 20 when the apparatus is `being lowered into the Well. When the sleeve 3| is'rotated with respect to the sleeve I'I, the pins 43'take the position shown in dotted lines at 43a inFigure ,6, in which position the pins 2| may move `into the longitudinal portion of the-slots 20, there being a recess 20h in the slots opposite the lateral offset portion 20ato receive the pins 43.
Any suitable means may be provided which willl prevent the sleeve 3| from rotating ytoo easily upon the sleeve I 'I. In the arrangement illustrated in Figure 3, spring-pressed, ball detents are mounted in the shoulder portion I'Ia of the inner I'sleeve and fitted into the recess on the loweredge of the sleeve 3|. The balls used for this purpose are shown at 44, andthe springs for operating the balls are shown at 45. These -may be mounted in vertically drilled holes 4l 75 inthe shoulder portion 1a of the inner sleeve and may be adjustably mounted by means of adjusting screws 41 mounted therein. It will thus be seen that in order to rotate the sleeve 3| with `respect to the sleeve l1, the balls 44 must be pressed downwardly slightly against the action of the springs 45 so that considerable torque must be exerted between the pins 2| and the sleeve in order to rotate the pins 2| into the longitudinally extending portions of the slots 2D.
` @The anchor pipe l2 prevents the'man'drel I9 and the pins 2| from rotating while the tubing I2 and the packer setting assembly are rotated to move both sleeves I1 and 3| with respect to the pins 2|, and to move the sleeve l1 relative to the sleeve 3| as justoutlined above. If desired, other means for resisting rotation between the sleeve I1 and the sleeve 3| may beprovided such, for example, as frictional washers.
After the pins 2| are in the longitudinal portions of the slots 20, the packer setting assembly may be moved downwardly to depress theupper shoe I3 and set the packer. The packer setting assembly may then be removed from the well at any time, leaving xed in the well the portion of the' apparatus shown in Figure 4, together with the anchorpipe.
While only one embodiment of the invention has been shown and described herein, it is obvious that various changes may be made in the construction and arrangement of parts without departing from the spirit of thev invention *or the scope of the annexed claims.
1. In combination, an openvhole packer assembly and a packer setting assembly for tempo rarily seeming and sealing a conduit in a well,
said packer assembly including a. central hollow mandrel with a lower/shoe xed thereto and having a back pressure valve operatively` connected therewith, an anchor pipe for preventing downward movement of said mandrel and lower shoe, a packer on said mandrel above said lower shoe,
.an upper shoe slldably'mounted on said mandrel upper shoe depressing means in inoperative position, to prevent the setting of said packer prematurely.- l
2. In combination, an open hole packer assembly and a packer setting assembly for temporarily securing and sealing a conduit ina well, said packer assembly including a central hollow'ma'ndrel, with a lower shoe fixed thereto and having a back` pressure valve associated therewith, an anchor pipe for preventing downward movement of said mandrel and lower shoe, a packer on said mandrel above said lower shoe, an upper shoe slidably mounted on said `mandrel above said packer Vand having means for gripping said mandrel to prevent upward movement with respect thereto, and said packer setting assembly including pin and slot connecting means for detachably connecting a conduit to said hollow [mandrel in uid tight relation, means for de- V bly and a packer setting assembly for temporarily securing and sealing a conduit in a well, said packer assembly including a central hollow mandrel, with a lower shoe fixed thereto and having a backl pressurevalve associated therewith, an'
anchor pipe for preventing downward movement of said mandrel and lower sh, a packer on said mandrel above said lower shoe, an upper shoe slidably mounted .on said mandrel abovevr saidpacker and having means for gripping said mandrel to prevent upward movement with re.-.
spect thereto, and said packer setting assembly including a sleeve adapted to make connection with a conduit and having slots therein adapted to depress the-upper shoe thereon and, set the o packer in the well.
" ROLAND E. ODONNELL.