US1382770A - Packer for wells - Google Patents

Description

W. W. FONDREN.

PACKER FOR WELLS.

APPucATmN mso 1AN.10,1921.

Patented June 28, 1921.

WALTER WILLIAM FONDREN, 0F HOUSTON, TEXAS.

PACKER FOR WELLS.

Specification of Letters Patent.

Patented June 28, 1921.

Application mea January 1o, 1921. serial No. 436,293.

T0 all whom t may concern.'

Be it known that I, WALTER WILLIAM FON- DREN, a citizen of the United States, residing at Houston, in the county of Harris and State of Texas, have invented certain new and useful Improvements in Packers for Wells, of which the following is a specification.

This invention relates to new and useful improvements in a packer for wells.

The object of the invention is to provide a device of the character described, which is particularly adapted for use in oil wells, and whereby a water tight joint may be formed between an outer and an inner pipe.

The packer is interposed between oil and water strata to prevent the mingling of water with the oil, and is also used to force the oil to enter the pipe through the screen or strainer, and to prevent the same from passing up between the pipe and the well casing. The device herein described may be used anywhere it is desirable to form a joint between an inner and outer pipe.

With the above and other objects in view, the invention has particular relation to certain novel features of construction, arrangement of parts and use, an example of which is given in this specification and illustrated in the accompanying drawings, wherein Figure 1 .is a sectional View of the packer in position to be set, and

Fig. 2 is a sectional view, showing the packer set and in position to. case off water and prevent the passage of iuid between the outer casing and the inner pipe.

Referring now more particularly to the drawings, wherein like numerals of reference designate similar parts in each of the figures, the numeral 1 refers to a casing, which is set in a well bore. When the well bore has been completed, as is well known to those familiar with the art of oil well drilling, a strainer or screen is set in the oil bearing strata atthe bottom of the bore. This screen has not been shown in the drawings, but may be attached to the lower end of the pipe section 2. The upper end of this section is outwardly .threaded as at 3, and surrounding the lower end thereof, is a collar 4, which is fixed thereon by means of Va set screw 5. Threaded over the upper end of the section 2 is the sleeve 6, and interposed between lsaid sleeve and collar is a packer ring 7, preferably formed of lead, or some other soft metal. When the sleeve 6 is screwed down onto the section 2, it will cause the packer rlng 7 to bulge outwardly against the casing all around the section 2, forming a water tight joint. For the purpose of applylng the packer ring, I. have provided the upper and lower collars 8 and 9, which are connected by means of the nipple 10, said collars being screwed onto the respective ends of sald nipple by means of right hand threads, and the lower end 11 of the collar 9 has external left hand threads, adapted to be screwed in the corresponding threads 12 1n the'upperend of the section 2. A pair of oppositely disposed dogs 13, 13 are provided whlch are interposed between the collars 8 and 9 and whose respective ends have the fingers 14 and 15, which have the required radial movement in radially extending slots, cut 1n the adjacent ends of the respective collars 8 and 9. These dogs are seated on the respective sprlngs 16, 16, interposed between them and the nipple 10. The device is first assembled intov the position shown in Fig. 1, andthen attached to a pipe by means of which it is let down into the well casing to the desired point. The pipe is then rotated in the usual direction, causing the collar 9 to unscrew from the section 2. The pipe is then lifted a short distance, elevating the collars 8 and 9 until the dogs 13 clear the upper end of the elevator 6. The dogs are then forced outwardly by the spring 16, and project beyond the collar 8, as shown in Fig. 2. A rotation of the pipe will cause said dogs to aline with the opposing notches 17, 17, provided in the upper end of the sleeve 6, and said dogs will drop into said notches and a further rotation of the pipe will operate to rotate the sleeve 6, and it will be screwed downwardly onto the section 2, forcing the packer rin 7 out against the casing, as shown in ig. 2, thereby formingA a water tight joint in the manner shown, and for the purposes hereinabove explained. When the packer has been set, the device may be then withdrawn from the well, if it is so desired.

What I claim is 1. A device of the character described, including a pipe section, a packer surrounding the same, a sleeve threaded onto said sec- `tion and adapted to abut against said packer to expand the same, a rotatable member tted within the sleeve and capable of being connected with and disconnected from said pipe section, radially movable dogs carried bysaid member, yieldable members operatloo ing against saidr dogs, and tending to force them outwardly, the upper end of the sleeve being provided with notches into which said dogs project when brought into alinement therewith, thus forming a connection between the rotatable member and the sleeve through which the sleeve may be rotated against said packer to expand the same.

2. A device of the character described for setting a well packer in a well, including a sleeve adapted to be screwedl on the pipe carrying said lpacker, a rotatable member fitted within the sleeve, radially movable dogs carried by said member, yieldable members operating against said dogs and tending to force them outwardly, the upper end of the sleeve being provided with notches into which said dogs project when brought into alinement therewith, thusforming a connection between the rotatable member and the sleeve, through which the sleeve may be rotated.

3. A packer setting mechanism, including a sleeve, a rotatable member within the sleeve, radially movable dogs carried by the said member, yieldable members operating against the dogs and tending to force them outwardly, interengaging means carried by the upper end of the sleeve with which the dogs are arranged to engage when brought into alinement therewith, to prevent the relative rotation of said member and the sleeve.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WALTER WILLIAM FONDREN.

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