US1903109A - Spear - Google Patents

Description

Patented Mar. 28, 1933 vPATENT FriesY AUDREY L. HAMPTON, F HOUSTON', TEXAS lsrnnn Application filed February 8, 1932. Serial No. 591,518.

This invention relates to a spear. An object of the invention is to provide a spear for insertion into a pipe 1n aV well bore and engageable with the pipe and whereby` the pipe may be pulled from the bore.

Another object is to provide a spear of the character described which may be readily released from the pipe, in case the pipe'can not beI pulled, and maintained in released position while the spear is withdrawn from the pipe.

Vith the above and other objects in view this invention has particular relation to certain novel features of construction, operation and arrangement of parts an example of which is given in this specilication and illustrated in the accompanying drawing, wherein Figure 1 shows a vertical sectional view of the spear located in a pipe to be pulled,

Figure 2 shows a fragmentary side view partly in section, and

Figure 3 shows a cross sectional View taken on the line 3-3 of Figure 2.

Referring more particularly to the drawing, wherein like numerals of reference designate similar parts in each of the figures the numeral 1 designates a tubular mandrel to the upper end of which the operating stringr 2 1s attached. Around the mandrel there is a tubular expander formed of the lower and upper sections 3, 4 and the upper end of the upper section is formed with an annular outwardly extending stop 5. vThese sections 3, 4 are clutched together by the intermeshing prongs 6, 7 which permit the sections 3, 4 to move longitudinally, relativev to each other but which prevent their relative rotation. The. lower section 8 is downwardly flared externally and its lower end has the internal, coarse, left hand threads 8 and the lower end of the mandrel is enlarged and has the coarse threads 9 to mesh with the threads 8.

On the expander there is a slip sleeve 10 whose lower end is formed with the yieldable arms 11. The lower ends of these arms carry the slips 12 whose outer sides are toothed and whose inner sides are flared to conform to the contour of the iiared portion of the expander.

The .slip sleeve 10 has the inwardly extending studs 13 which work in the vertical slots 14 out through the expander section 4.

Themandrel 1 has the externally threaded section 15 which has a right hand threaded connection with the upper end of the expander section 4.

In use the spear may be assembled as shown in Figure 1 and let down into the stuck pipe 16 until the stop 5 landson the upper end of the pipe. An upward pull may then be. exerted, through the string 2 and mandrel land the lower section 3, of the expander, will be correspondingly moved upwardly and will wedge between and expand the slips 12 into engagement with the stuck pipe 16. This pipe may thus be dislodged and pulled from the well. As a pull is exerted on the mandrel 1 it will move upwardly carrying the stop 5 above the upper end of the pipe 16, the mandrel section 4 moving upwardly relative to the slip sleeve 10 and studs 13 in the slots 14.

If the pipe 16' can not be pulled the operating stem may be released to permit it, together with the mandrel 1, to move downwardly until the stop 5 again lands on the upper end of the pipe 6 and the expander will be forced downwardly to release the slips 12. The string 1 may then be turned tothe right, moving downwardly through the section 4, said section being held against turning by the studs 13, which in turn are held against turning by the frictional engagement of the slips 12 with the pipe 16. As the mandrel 1 is thus turned the intermeshing left hand threads will cause the lower expander section to move downwardly relative to its upper section and relative to the slips 12, said slips being now supported, by the studs 13, from said upper section 4. Upon an upward pull being now exerted on the string 2 the expander section 8 will be maintained out of Contact with the slips 12 and said slips will not be expanded and ille spear may be readily pulled from the pipe 16.

The drawing and description disclose what is now considered the preferred form of the invention by way of illustration only while the broad principle of the invention will be dened by the appended claims.

That l claim is l. A spear comprising a mandrel, a sectional expander around the mandrel, said mandrel being connected to the sections of the expander by reversely pitched threads, an expansible pipe engaging means on the expander connected to the upper section thereof, means interconnecting the said section to permit their relative longitudinal movement but to prevent the relative rotation.

2. A spear comprising a mandrel, an expander thereon formed of upper and lower sections, means connecting the mandrel to said sections whereby the length of the expander may be varied by one way rotation of the mandrel relative to the expander, a pipe engaging device on, and connected to the upper section of, the expander'.

3. A spear comprising a mandrel, an expander thereon formed of upper and lower sections, means connecting` the mandrel to said sections whereby the length of the expander may be varied by the rotation oi the mandrel relative to the expander, a pipe engaging device on, and connected to one section of, the expander, the other ex )ander section being shaped to actuate said device into engagement with a surrounding pipe upon an appropriate relative movement of said other section and said engaging device.

4. A spear Comprising a mandrel, an expander thereon formed of upper and lower sections, means connecting the mandrel to said sections whereby the length of the expander may be varied by the rotation of the mandrel relative to the expander, a pipe engaging device on, and connected to one section of, the expander, and an external stop on said upper section.

5. A spear comprising a mandrel, an expander thereon formed of upper and lower sections, right and left hand threads connecting the mandrel to said respective sections whereby the length of the expander may be varied by the rotation of the mandrel relative thereto, an expansible pipe engaging device on the expander and connected to said upper section and whose transverse diameter may be varied as said expander is so varied.

6. A spear comprising a mandrel, an expander thereon formed of sections having a slip joint connection, right and left hand threads connecting the mandrel to the respective expander sections for moving said sections lengthwise relative to each other, as the mandrel is rotated relative to the expander, an expansible pipe engaging device on the expander connected to and having a limited longitudinal movement relative to, one of said sections, the other section being shaped to expand said device` 7. A spear comprising a mandrel, an expander thereon formed of sections having a slip joint connection, means connecting the mandrel to the respective expander sections for moving said sections lengthwise relative to each other, as the mandrel is rotated relative to the expander, an expansible pipe engaging device on the expander connected to and having a limited longitudinal movement relative to, one of said sections, an external stop on said last mentioned section, the other section being shaped to expand said device upon an appropriate longitudinal movement of said other section relative to said engag ing device.

8. A spear comprising a tubular mandrel, an expander around the mandrel formed of upper and lower sections, an outwardly extending stop carried by the upper section, intermeshing prongs forming a clutch between said upper and lower sections formed to permit their relative longitudinal movement but to prevent their relative rotation, right and left hand threads connecting the mandrel with the upper and lower sections respectively, said lower section being downwardly flared, a slip sleeve on the expander formed with depending yieldable arms, slips carried by the lower ends of said arms and arranged to be expanded by the lower sections of said expander, said sleeve and the upper expander section being provided one with a vertical slot and the other with a stud which works in said slot.

In testimony whereof I have signed my name to this specification.

AUDREY L. HAMPTON.

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