US1672321A - Rotary jar - Google Patents

Description

June 5, 19285 J. A. KAMMERDINER ROTARY JAR INVENTOR. Jam"; ,4. fimmfi/"mkier Filed Nov.29, 1926 A TTORNEYS.

Patented June 5, 1928.

UNITED STAT S JAMES A. KAIMERDINER, LOS ANG -ELES, CALIFORNIA.

Ronni JAR.

Application and November 29, me. Serial in. 151,325.

This invention relates to a rotary jar for use in well drilling apparatus, and more particularly to a jar which may be placed in a string of drill pipe, to remain there during the drillin operations. It is thus available for imme iate use when the need arises. This is of very great value, as it is well known those skilledin the art that if,

.and the lost tool has had a chance to. become more firmly lodged in the hole, increasing the difiiculty of its removal. It is accordingly an object of this invention to provide a rotary jar which ma be used in a string of drill pipe during dri ling operations. i A further object is to provide a jar which may be readily manufactured. Tools of this type as heretofore constructed have been sub ect to rapid wear and it is a still furthlerobject of this invention to provide a jar of increased durability and Wearing qualities. i

f hese objects together with other objects and corresponding accomplishments are obtained by means ofthe embodiment of .my invention illustrated in the accompanying drawingin which:

Fig. 1 IS an axial section through a jar 85 in its normal, 'or set, position; Fig. 2 is a clear space between the thread sections 11 for the thread sections 19'to 'versa. Also the keys 12 an similar section through a portion of the vshell only; Fig. 3 is a section corresponding to Fig. 1 and taken at right angles to it, the lower portion being broken away; and Figs. 4 and 5 are sections as seen on thecorrespondingly numbered lines of Fig. 1 looking in'the'direction indicated by the arrows.

' Referring more particularl to the draw- J ing, a cylindrical body'or she I 6 is provided witha tapered, threaded pin 7 at its upper end and having a bore 8 extending through it; The diameter of the upper portion of the bore is reduced to form a plunger chamw ber 9 and is still further reduced where it passes through the pin. The body is internally threaded at its lower end and mounted therein is .a closure member 10,.

'iforming an anvil. Within the. bore is a mutilated thread 11, formed of two diametl 'rically opposed portions, each occupying aproximately one quarter of the periphery.

elowthese threads are two keys or abutments 12, also diametrically opposite each other and extending from one edge of the thread to the center, thus occu ying approximately one eigth of the perip ery each, and leaving three-eigths 'of it unoccupied between them.

Disposed within the shell is a hammer comprising a cylindrical head '15 adapted to engage the anvil 9 and a tubular mandrel 16 extending slidably through the bore in the anvil. The lower portion of the mandrel terminates in a tapered threaded pin 17 to which any suitable tool may be attached, in this case a bit or under reamer. The \mandrel 16, above the hammer 15 is provided with two diametrically opposite keys or abutments 18 each occupying approximately one-eigth of the peri hery of the mandrel and leaving three-eigt s clear between them.

Above these again are mutilated threads 19, diametrically opposite and occupying approximately one-quarter of the periphery, for engagement with the corresponding threads in the shell. Above threads 19 are bosses 20, of such learigth and position that they will keep thre s 19 from e agin threads 11 until the tool is entirely co apse and the full number of threads can engage each other. The upper portion of mandrel 16 is reduced in diameter toform, a plunger 21, rovided with packing 22, which 'works incamber9.

It will be noted that there is sufiicient ass and" vice 18 form a. spline and are'so proportioned as to permit only a quarter turn of the shell relative to the mandrel; in one extremity of this movement, the threaded sections are fully engaged, while at the other they are free and vertical movement of the shell relative to themandrel can occur. However, the spline. acts to limit rotary movement at all portions of the mandrel.

The hammer member is provided with a bore 23, extending -therethrough, so that circulation may be maintained from the drill pipe above, through the jar and on thron h.

the .tool or pipe attached to pin 17. e

packing 22 forms a tight seal between plunger 21 and plunger chamber 9, whatever the position of the hammer, and prevents 110 loss of circulation into the cage and thence between members 10 and 16 into the hole. Mounted in closure member 10 and secured thereto by a set screw 2% is one end of a compression spring 25 which encircles the lower portion of mandrel .ldythe other and rests in a recess in the collar above pin This spring must be wound to correspond with the mutilated threads ll and 19, that is, the threads are left hand, the spring must be wound left hand and vice versa.

The jar is placed in a string of drill pipe, the drilling tools at the lower end, and these then set onthe bottom. The weight oil ripe above jar will cause it to telescope compress spring 515, tends to and cause rotation oil the cage and mandrel relative to each other. This is prevented however by lug lid, until the threads fully engaged, and the jar is fully telesooped. When this occurs, cage 6, being supported by the drill pipe which is tree to turn, will be turned one quarter oil a revolution .by spring 25 acting against the mandrel, which is held stationary by the drilling tools on bottom. This will bring the threads into full engagement as clearly shown in 4 oil the drawing and lugs and 18 together, as shown in Fig, 5. Further movement is obviously prevented by these lugs, The tool is new set; the drill is picked upofi bottom and drilling procoeds, the twist of? the drill pipe being transmitted from shell 6 by lugs l2 and 18 which comprises a rotarv coupling to mandrel l6 the drill. It IS evident that these lugs may be of any length to obtain the required strengnh. Should the drill become stuck, the drill pipe is lifted and a pull exerted on the tools, which may be suihcient in itself to free them i not, the tension in the drill Icipe caused thereby will stretch it, as a long string oil such pipe has considerable elasticity. 'When suficient tension has been attained, the pipe is given a reverse quarter turn, which causes the thread sections 11 to slip out of engagement with thread sections 19 into the clear space between them, permitting the shell to ride u on the harm mer member until the anvil strikes the hammer head. This will give a heavy blow in an upward direction to the drilling tools and probably free them. If the first blow fails, as many blows as desired may be struck, by repeating the operations of setting the jar and stretching the pipe just described. When free the tools may be re moved from the hole, or the jar reset and drilling proceeded with as desired.

The jar can be used for a plain fishing job, in a similar manner, in which case it 18 run in the hole with suitable fishing tools attached to its lower end. When a hold is secured on the. fish, the jar is set and blows delivered as before described.

nearest What I claim is:

l. A rotary jar for use in well drilling comprising a rotary hammer member and a rotary anvil member telescopically connected, each of the members having trig shoulders, said shoulders being interrupts to permit the passage in an axial direction of the shoulders on the hammer member past the shoulders on the anvil member whereby when said shoulders are in engagement further longitudinal movement of the members is prevented, but when out of engagement longitudinal movement of said members is permitted, and spline means for said members permitting a limited rotary movement for engagement and disengage merit of said shoulders.

2. A rotary for use well drilling comprising a rotary hammer member a rotary anvil member telescopically connected, each of the members having trip shoulders, said shoulders being interrupted to permit the passage of the shoulders on the hammer memberp'ast the shoulders on, the anvil member whereby when said shoulders are in engagement further longitudinal movement of the members is prevented, but when out of engagement longitudinal movement of said members is permitted, and a spline rotary coupling for said member permitting a limited rotary movement for engagement and disengagement of said shoulders.

3. A rotary jar for, use in well drilling comprising a rotary hammer member and a rotary anvil member telescopically connected, each of the members having trip shoulders,

lll

Bill

said shoulders being interrupted to permit the passage in an axial direction or the shoulders on the hammer member past the shoulders on the anvil member whereby when said shoulders are in engagement further longitudinal movement of the members is prevented, but when out of engagement longitudinal movement of said members is permitted, and spline means independent of said shoulders for transmitting rotary motion from one member to the other at all axial positions of said members and permitting a limited rotary movement for engage ment and disengagement or said shoulders. 4. A rotary jar for use in well drillin comprising a rotary hammer member and a rotary anvil member telescopically connected, each of the members having trip shouldei's, said shoulders being interrupted to permil: the passage'in an axial direction of the shoulders on the hammer member ast the shoulders on the anvil member where y when said shoulders are in engagement further longitudinal movement of the members is prevented, but when out of enga ement longitudinal movement of said mem ore is permitted, means operated by closure movement of said members to turn said shoulders lld into operative on merit, and s line means independent of shoulders t d limit the rotary movement between said members at all axial positions of said members and permit engagement and disengagement of said shoulders.

5. A rotaryjar for use in well drillin comprising a rotary hammer member an a rotary anvil member telesco ically connected, each of the members having trip shoulders, said shoulders being interrupted to permit the passa e in an axial direction of the shoulders on t e hammer member pastthe shoulders on the anvil member whereby when said shoulders are in engagement further longitudinal movement of the members is prevented, but when out of engagement longitudinal movement of said members is permitted, and spline means independent of said shoulders to limit movement between said members at all longitudinal positions engageable at all axial ositions of said members and permitting a imited rotary movement for engagement and disengagement of said shoulders.

6. A rotary jar for use in well drilling comprising a rotary hammer member and a rotary anvll member telescopically connected, each of the membershaving tri shoulders, said shoulders bein interruptes to permit the-passage of the s oulders on the hammer member past the shoulders on the anvil member whereby when said shoulders are in engagement further longitudinal movement of the members is prevented, but when out of engagement longitudinal movement of said members is permitted, and means independent of said shoulders to limit the rotary movement between said members located longitudinally beyond said shoulders and operab e at all axial positions of said members.

7. A rotary jar for use in well drilling comprising a rotary hammer member and a rotary anvil member telescopically connected each of the members having correspondi 'ly mutilated threads forming trip shoul ers to permit the longitudinal passage of the shoulders in the hammer member past theshoulders on the anvil member when in one angular position and to prevent lon 'tudinal movement of the members when the s oulders are in engagement, and spline means for said members permitting a limited rotary movement for en agement and disengagement of said shou ders.

8. A. rotary jar for use in well drilling, comprising a rotary hammer member and a rotary anvil member telescopically connected, each of the members having correspondingly mutilated threads forming trip shoulders to ermit thelongitudinal passage of the shoul ers when in one angular POSI- tion and to prevent lon 'tudinal movement of the members when t e shoulders are in engagement, and abutments longitudinally spaced from said shoulders on said anvll members and on said hammer member to provide a spline permittin engagement and disen agement of said s oulders but engagea le at all axial positions of said memers so as to limit rotary movement of said members.

In witness that I claim the fore oin I have hereunto subscribed my name t is 1 th day of November, 1926.

JAMES A. KAMMERDINER.

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