US1914320A - Nonswiveling jar - Google Patents

Description

T. w. BELL NONSWIVELING JAR Filed Sept. 11, 1930 June 13, 19330 7Zv/v/7a% 61 24 1 MWM Patented June 113, 1933 teens are THOMAS W. BELL, 0F PARKERSBUEG, VVEST' VIRGINIA, ASSIG-NOR- TO ACMEv FISHING TOOL COMPANY, OF PARKEESBURG, WEST VIRGINIA, A CORPORATION OF WEST VIRGINIA NONSWIVELING JAR Application filed September 11,1930. Serial No. 481,185.

My present invention relates to a non-swiveling jar for use in well drilling, and to a method of forming the same.

In the well drilling art, it frequently happens that a tool becomes stuck in the drill hole. In order to loosen the same, an accessory known as a drill ar is used. This ordinarily consists of two or more parts secured together so that there may be a limited amount of longitudinal movement between them. VJhenthis tool is incorporated in a string including a stuck tool, and the string reciprocated, an impact is caused when the parts of the jar reach their limit of movement. This impact when repeated, has been found to be effective to loosen a stuck tool so that it may be removed. In some instances a swivel jar is desirable, that is, a tool that will not only permit relative longitudinal movement between these parts, but likewise rotary movement. Such a swivel prevents kinking or fouling of the line. Other jars are of the non-swiveling type, to which the present invention pertains.

Due to the impact between the jar parts when their limit of longitudinal movement has been reached, it is essential that such elements be of a sturdy construction or else their effective life will be very short. Likewise, it becomes necessary that the two relatively movable parts be secured together in a positive and efiicient manner, not'only to prevent accidental displacement, but also to present an economical article to the trade.

To this end the invention contemplates a non-swiveling ar composed of a cylindrical sleeve having an axial bore and slots through the bore walls, with a headed element secured within the bore and having wings riding in the slots to prevent rotary movement between the parts, the above combination being composed essentially of but two integral parts, in contradistinction to elements composed of many parts secured together.

A method of forming the above non-swiveling jar as contemplated by the invention, comprises first providing a solid bar, forming therein an axial bore, interiorly reaming a peripheral recess therein, forming in the sleeve walls longitudinal slots, inserting a headed element having integral wings thereon into the axial bore of the sleeve by deforming the sleeve end until the bore will accommodate the head and the wings thereof ride in the slots, and closing the end of the sleeve upon the restricted neck beyond the head, that portion of the sleeve constituted by the recess conforming closely to the head and forming a shoulder.

Theinvention contemplates that the wings on the head shall be of less vertical extent than the head, so that an impact may be secured by contact of the head with the shoulder of the sleeve and the top of the wings with the ends of their respective slots Within which they ride.

The invention further consists in the novel arrangement, combination and construction of parts and the method more fully hereinafter described.

- In the drawing- Fig. l is a view partly in section, showing the sleeve in process of formation in solid. lines, and as completed in dotted lines.

Fig. 2 is a fragmentary perspective view of the headed element.

Fig. 3 is a sectional view along the line 3-3 of Fig. 1 after deformation of the sleeve element and with the headed element inserted.

Fig. 4 is a sectional view along the line 4% of Fig. 1.

5 is a view partly in section of a completed non-swiveling jar, constructed accord ing to this invention.

Referring now to the embodiment illustrated in the drawing, I have shown a sleeve element at 1 having an axial bore 2 therein.

be lower portion of the element is provided with a squared section 3 adapted to be gripped by a wrench or the like and a threaded socket 4 for attachment to other tools of a string. As shown, the axial bore 2 is initially formed of substantially uniform diameter except for portion 5, the purpose of which will be fully described hereinafter.

The neXt operation consists in interiorly reaming a recess in the bore so as to form two substantially frustro conical surfaces 6 and 7, with their larger bases adjoining. While these surfaces are described as being substantially frustro-conical, yet they need not be accurately so. Slots 8 are then cut through the walls of the sleeve, the upper ends terminating short of surface 7.

A headed element 9 is provided having the usual threaded portion 10, a neck 11 and a head 12, with a shoulder 13 between the head and neck. Integral longitudinal side wings 14 are provided on each side of the head, the wings terminating short of the shoulder 13. The width of the wings 1 1 is such that they will ride freely Within the slots 8 without binding.

It is an important feature of the invention that the wings be an integral part of the head in contradistinction to a construction in which the head is slotted and a key inserted and secured therein, or one in which wings are secured to the outside of the head. As above set forth, it is imperative if an economical and practical tool is to result, that maximum strength reside in this construction. For this reason the head and its wings are preferably formed from a single piece of metal.

In order to insert the headed element into the bore of the sleeve, which is ordinarily too small to accommodate the wings, the sleeve end is heated and deformed until the bore thereof assumes a shape substantially as shown in Fig. 3, and at any event so that one diameter thereof is such as to receive the head plus its wings, and its opposite diameter such as to receive the head without the wings.

lVhen this state has been reached, the head is slipped therein, the Wings 14 taking their place in the slots 8. Using the head 12 and the neck 11 as a mandrel, the end of the sleeve is then worked thereover until the sleeve assumes the shape shown in the dotted lines of Fig. 1. It is to be noted that in the working or deformation operation, the metal at the sleeve end flows somewhat, the surface 6 closing in and forming a substantial continuation and having a thicker wall than the remainder.

'This produces after the closing operation,

a sleeve of substantially uniform outside diameter as shown in the completed device of Fig. 5.

In some instances it may be found desirable to ream the bore at the end of the sleeve a little in order to facilitate the entrance of the winged head herein upon deformation. This presents no great difficulty as in the closing in operation the desired thickness of the sleeve end is restored. Consequently the only eventual result of the removal of a quantity of metal as above described is a shortening of that part of the sleeve end which lies around and adjacent the neck of the headed element.

In operation, the complete jar of Fig. 3 having been incorporated in the tool string, an upward movement of the line will cause the headed element to move upward and its shoulder 13 contact with the sleeve shoulder 15. At the same time the top of each wing 14 contacts with the top of its slot. This impact gives the necessary jar to the stuck tool and may be repeated until loosened. Where a down jar is desired, it will be apparent that by suddenly lowering the line, the shoulder 18 on the headed element will contact with a corresponding shoulder on the sleeve end, or by elongating the neck 11 or decreasing the length of the bore 2, the shoulder 19 on the head 12 may be made to contact with the shoulder 20 on the sleeve. At any event, the wings prevent rotation or swiveling of the parts with relation to each other. The slots 8 also serve the function of permitting the slushing fluid in the well to be expelled therethru freely as the head moves up and down, thus preventing the interruption of free movement thereof due to water and detritus. The lower portion 5 of the bore of less diameter than the main portion serves not only to provide a shoulder 20 but also permits any detritus to settle therein away from the head 12 and to spill or drain out of the hole 21. By utilizing wings 14 of substantial height, maximum strength and resistance to impact fracture or deformation is secured. although it is desired to have the wings of less vertical extent than the head in order that they should not interfere with the efficiency of the closing in operation.

lVhile I have shown and described the invention with relation to a particular application thereof, yet obviously I do not wish to be limited specifically thereto.

I claim A non-swiveling jar comprising a sleeve having an interior bore of two diameters forming at their junction a shoulder. the sleeve having two diametrically opposed longitudinal slots through the bore walls, and an element having a neck and head, its head THOMAS W. BELL.

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