US1821426A - Hydraulic plug and whipstock - Google Patents

Description

Sept. 1, 1931. H. DUMM ET AL 1,821,426

' HYDRAULIC PLUG AND WHIPSTOCK Filed Jan a L. o e w \OMNW N w v m wym vDR h a 0/ 4, w: O N .w

. Patented Sept. 1, 1931 UNITED STATES PATENT OFFICE nowm mum AND um 12. nusmn, or LOI'G anon, camoam mmumc 2mm AND Application mu rum- 1:, mo. Serial Io. 400,40.

This invention relates to a hydraulic plug and whipstock which is placed in an oi well when it is desired to cement a certain section thereof to check a flow of liquid,

( or to set a whipstock or similar 0 rations. When a plug is to be subsequent y drilled out, it is naturall desirable that a minimum.

amount of meta be placed in the (plug so that the bit is not unduly hampere )0 An object of-our invention is to provide aplug of the character stated which is set at any desired point in the'well by hydraulic pressure.

Another object is to provide a novel plug of the character stated which will permit fluid to circulate therethrough while it is in place, or while it ,is being inserted in the well.

An advantage of our plug is that a whip-- 2 stock can be attached thereto and this whi stock can be placed simultaneously with t e plug. This results in a material saving in time and labor.

Other objects, advantages and features of invention may a pear from the accompanying drawings, t e subjoined detailed description and the appended claims.

In the drawings Figure 1 is a side elevation of our plug with parts broken away showing interior construction. y Figure 2 is a longitudinal, sectional view of our plug.

Figure 3 is a longitudinal, sectional viewtaken on line 3-3 of Figure 2.

Figure 4 is a side elevation of our plug and whipstock.

Figure 5 is a bottom plan view of the sliding cam member.

ings, the numeral 1 indicates a cylindrical body member which is formed of wood so that it can be readily drilled out by subsequent operations of the bit. fibrous packing disc 2 is secured to the top 0tv the body 1 and this disc fits loosely Within the casing and within the bore below the casing so that the plug can move freel downwardly under the pressure of the uid on top of the Referring more particularly to the drawplu all of which is usual and well known to t ose skilled in the art.

A bore 3 extends into the body 1 from the bottom thereof and the bore terminates adjacent the upper end of the body. A circulatin pipe 4 extends into the body 1 from t e top thereof and protrudes well into the bore 3. The pipe 4 is secured to the drill pipeiin the usual manner. and the circulation passes through this pipe and the drill ipe as" will be further described- A ll-nipple 5 is secured to the pi 4 and bears against the upper surface 0 the disc 2. The purpose of the nipple being to assist in supportin the pipe 4 and to keep a this pipe from ben ing due to the weight of the pipe. The pipe 4 is secured in the body -1 by a pair of nuts 67 which screw on to the pipe and bear against the-body.

A urality of slots 8 are cut in the body 1 an extend through the body into the bore 3. A dog 9 is pivotally mounted in each of the slots and the outer surface of each of the dogs is serrated or-notched so that the dogs wil engage and securely grip the wall of 7 the hole. A cam cylinder 10 is slidably mounted on the pi 4-adjacent the lower, end thereof, and t e gur se of this cylinder is to engage eac o the dogs 9 and rotate them outwardly so that they engage so the wall of the hole to hold the plug in position.

A cup 11 is mounted below the cylinder 10 and engages the walls of the bore 3 so that there is no leakage past the cylinder 5 7 when the plug is o erated to actuate the dogs, as will be furt er described. A compressible closure member 12 is mounted in lower end of the body 1. hole 19 is pro- 1") therethrough. A hole ment of the ball 22. The plate 13 rests. against a shoulder 24, thus limiting the up! ward movement of the plate.

While the plug is being run into thehole, fluid is forced into the casing to push the plug downwardly, this fluid will ass around the plug to the bottom'of the ole 21. The ball 22 will be lifted and the fluid will pass upwardly through the pipe 4 into the drill pipe and thence to the surface. After the plug is lowered to the desired point, fluid under pressure is forced into the drill pipe. The ball 22 is seated in the hole 21, the fluid acts upon the 010- 1 sure plate 13 and causes the plate to be de- "pressed as shown in Figure 1. The fluid NJ thenescapes around the bottom edge of the bell housing 17 and then moves upwardly in the bore 3 and acts upon the cup 11 to force the cylinder 10 upwardly. The upward movement of the cylinder causes it to engage the dogs 9, which dogs are then swung outwardly until they engage the wall of the hole and the plug is thus fixed in position. In order to retain the cylinder 10, in its raised position, we provide a spring hole allowing the cement to dry a suflicient latcli 25 which latch drops into notches 26 c on the exterior of the pipe 4. The plug is thus held immovable and the cement can be drop ed thereon in the usual manner.

I en setting a whipstock, present practice is to first lower the plug, then cement the length of time, then drill out the cement to fit the whipstock, then insert the whipstock in the drill hole, again cement the whipstock in place, after which the cement must again dry before the whipstock can be used. With our plug, a whipstock 27 can be secured to the upper edge of the body 1, preferably by screwing the whipstock on to the body. Theighipstock is lowered simultane ously with the plug and one cement job is sufiicient to secure the whipstock on place.

. Thus a material saving in time and labor results.

When our whipstock has been set in position in the hole as previously described, it can move neither upwardly nor downwardly. Also it is not difficult to release the drill pipe from the plug, and the plug will not be moved during this releasing process. When the whipstock is used, it can be accurately placed in a known position by means of a surveying instrument, and the plug can be set andwill be undisturbed by any subsequent operations.

7 body;,sa1d body and then upwardly through the holes 19- is permitted only upwar body, said body means" slidably mounted in said bore, an conduit means extending into the bore whereby hydraulic pressure is exerted on y.; =m0unted in the body, dog engaging the dogengaging means to actuate the same,

.to move. said dogs into engagement-with the wall; i 2. "A hydraulic lug comprising a. wooden aving a bore therein, a

. lura'litylof wall engaging dogs ivotally mounted in the body, a pipe exten ng into the 'bore,fa cam cylinder slidably mounted on the ipe, said cylinder engaging the dogs, and va ve means in said pi e whereoy flow dly through the pipe from the exterior of the plug.

3. A hydraulic pllug comprising a wooden aving a bore therein, a pluralit of wall engaging dogs ivotally mounte in the bod a pipe exten ing into the bore, a cam cylinder slidably mounted on the pipe, said 0 linder engaging the do s, yieldably mounte closure means over t e lower end of said pipe, said closure means having a hole therethrough, and a check valve in said hole.

4. A hydraulic lug comprising a wooden body, said body aving a bore therein, a plurality of wall engaging dogs ivotally mounted in the bod a pipe exten ing into the bore, a cam cy inder slidably mounted on the pipe, said cylinder engaging the do s, a movable closure plate bearing against t e bottom of said pi said closure plate havin a hole theret rough, a check valve in said hole and spring means yieldably ur ing said closure plate against the bottom 0 the pipe.

5. A hydraulic plug comprising a wooden body, sald body having a bore extending partl therethrough, a pipe extending into said ore, a plurality of wall engaging dogs pivotally mounted in the body, said dogs protruding into the bore, a cam cylinder slidably mounted on the pipe within the bore, means on the cylinder engaging the pipe whereby the cylinder is held in dog engaging position, and yieldable closure means bearing against the lower end of the P P 6. A hydraulic plug comprising a wooden partly therethrough, a pipe extending into said bore, a plurality of wall engaging dogs pivotally mounted in the body, said dogs protruding into the bore, a cam cylinder slidably mounted on the pipe within the bore, means on the cylinder engaging the pipe whereby the cylinder is held in dog engaging position, a closure plate bearing against the bottom of the pipe, said plate body, said body having a bore extending In testimon tures.

y whtereof, we afiix our signa- HOWARD DUMM. JAMES R. RUSSELL.

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