US2638373A

US2638373A - Deep well fishing tool

Info

Publication number: US2638373A
Application number: US4131A
Authority: US
Inventors: Norman W Alford
Original assignee: Individual
Current assignee: Individual
Priority date: 1948-01-24
Filing date: 1948-01-24
Publication date: 1953-05-12
Anticipated expiration: 1970-05-12

Description

May 12, 1953 N, WQ'ALFORD DEEP WELL FISHING Toor..

Filed Jan. 24, 1948 rofewfy.

Patented May 12, 1953 UNITED `s'1TAIFL AS PAT15.'.151'l` OFFICE DEEP WELL FIsHrNGl'rooL Norman dlfordQI-Iouston, Tex. Application January 24, 1948, Serial No..4,13.1

zf'This invention relates to a deep `well fishing toolrv: i v .1 LAn;object of the invention isfto provideatool of the character described adapted to 4be lowered into'aiw'ell and engaged with an object stuck in the well and whereby said object may be removed from the well. f

It is another object ofthepresent invention to provide a iishing tool of the character described which may be readily disengaged from the stuck lobject, invfc'ase the latter cannotbe removed, and 'the'.tool' withdrawn from the well.

Mt isa Ifurther object of the invention to provide a iishing tool of the character described which may be easily released from a stuck object that cannot be pulled by rotation of the operating string While the latter is under tension.

Other objects and advantages willbe apparent from the following speciiication which is illustrated by the accompanying drawings where- Figures 1 and 2 show vertical, sectional views of the upper and lower ends, respectively, of the tool in engaging position.

Figure 3 is a cross-sectional view taken on the line 3-3 of Figure 1.

Figures 4 and 5 are vertical, sectional views of the upper and lower ends of the tool in released position and Figure 6 is a side View partly in section of the complete tool engaged with the stuck object.

Referring now more particularly to the drawings wherein like numerals of reference designate the same parts in each of the figures, the numeral I designates the outer housing, as a whole.

Screwed into the upper end of the housing I there is a head 2 whose upper end is formed into a jaw clutch member 3.

The lower end of the housing is formed with a downwardly and inwardly tapering seat 4.

Extending axially through the outer housing there is a two part stem which is threaded through a coupling 6, connecting sections of the outer housing, by means of coarse left hand threads 1.

On the upper end of the stem 5 there is a jaw clutch member 8 to which the operating string 9, which extends to the ground surface, is connected.

Suspended from the lower end of the stem 5 there is a gripping device Il) having the cilepending flexible arms II and on the lower ends of these arms there are the wedge shaped slips I2 whose inner sides are toothed.

screwed a nut I4 2 claims. (oreal-102)* RA strong coil spring I3surrounds the stem 5 land isl interposed between the coupling 6 and the gripping device I0 and which tends to hold the slips I2 seated in the seat 4. The stem 5 has a'swivelling connection with the gripping -device.-

A `On vthe stem 5 beneath the head 2 there is and between said head and the'nut Ithere is a'strong coil springI5 which acts as a bumper uponY upward movement of the stem. v

It will be noted that-thestem 5 is composed of -two partswhich `are 'maintained `against sepa- -rationby arcoupling sleeve lvwhose lower end is connected to the lower section of the stem 5 and whose upper end has an internal annular ange which surrounds the upper section of the stem 5 and on this upper section of said stem beneath said flange there is a head I'I which has a splined connection I8 with the coupling I6 so that the upper and lower sections of the stem 5 have a limited longitudinal movement but they rotate together.

In operation the device is assembled as shown in Figures 1 and 2 with the stem 5 screwed downwardly to its lower position in the coupling 6. This will allow' the slips I2 to seat on the seat 4 and the tool, as thus assembled may be let down into the well and engaged over the upper end of the stuck object, such as a pipe or rod, I9.

The spring I3 will yield as may be required to allow the slips I2 to readily pass over the upper end of the stuck object I9 but said spring will urge said slips into their lower position around the stuck object.

An upward pull may then be taken on the operating string 9 and the stuck object may be pulled from the well bore.

During the attempt to remove the stuck object, if it proves to be difficult to remove, the string 9 may be lowered to allow the clutch mem-- ber 8 to engage with the clutch member 2, as indicated in Figure 1, and the string 9 then turned to transmit torsion to the stuck object. It is also to be noted that the stem 5 is tubular and uid may be forced down through the fishing tool and circulate about the stuck object to loosen it.

If said stuck object cannot be pulled from the well bore tension may be kept on the string 9 to keep the clutch member 8 disengaged from the clutch member 3 and the operating string and stem 5 may then be turned to the right and this will cause the thread 'I to move upwardly in .D the coupling 6 thus pulling the jaws I2 upwardly out of the seat 4 and causing them to release the stuck object, 'which cannot be pulled, so that the tool may be removed from the well.

A preferred form of the invention has been shown and described for the purpose of illustration while the broad principle of the invention will be dened by the appended claims.

What I claim is:

1, A fishing" tool comprising, a tubular Housing having an inside downwardly tapering seat adjacent its lower end and having an internally threaded portion above the seat, a two part stern through the housing whose lower portion formed with external threads to mesh with the housing threads, a gripping device depending from the stem andr including, contractile means arranged to be contracted by the seat, upon downward movement of the stem in thefhousing' to grip an object in the tool, said stem being connected tof the gripping device to move said. device upwardly upon upward movement of the; stem relative to theI housing, clutchy means`- on thev up per part of the stem and on the housing. engage;-

able to cause rotation of. the housing` upon rotation of the stem and releasable to allow the,` stem to rotate independently of. the housing and yieldable means acting. against the stem` and housing and normally tending toI maintain. said clutch meansengaged? and yieldable upon application of tension to the string to release said clutch means.

2,. A shing tool comprising, a tubularbhousing. having an. insidev downwardly tapering seat adjacent its lower end, an inwardly thickened,

lil

Number internally threaded coupling in the housing above said seat, a two part stern extended axially through the housing and whose lower portion is formed with external threads to mesh with said coupling threads, a gripping device depending from the lower end of the stem and having a swivelling connection therewith and including contractile means arranged to be contracted by said seat upon downward movement of the stem in the housing to gripfan object in. the tool, said stem being connected to the gripping device to move said device upwardly upon upward movement of the stem relative to the housing, clutch means onV the upper part of the stem and on the housing engageable to cause rotation of the housing upon rotation of the stem and releasable tofal-low the stem to rotate independently of the housing, yieldable means normally tending to hold: said gripping device on its seat and a coil spring acting against the stern and housing and normally" tending to maintain said; clutch means engaged, said spring being yieldable upon ap' pleaticm of tensionv to the string to release said clutch" means.

References Cited in the file of this patentI UNIIEB SYFAIES` P'A'I'llli'lfs Name Date 1,800,736 Lemex Apr.. 143 1931 2,123,036 Bozeman July 5,v 19'38 2,309,310 Gratehouser Jan. 26, 1-9'43